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/*
* tkTextDisp.c --
*
* This module provides facilities to display text widgets. It is the
* only place where information is kept about the screen layout of text
* widgets. (Well, strictly, each TkTextLine and B-tree node caches its
* last observed pixel height, but that information originates here).
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkInt.h"
#include "tkText.h"
#ifdef __WIN32__
#include "tkWinInt.h"
#elif defined(__CYGWIN__)
#include "tkUnixInt.h"
#endif
#ifdef MAC_OSX_TK
#include "tkMacOSXInt.h"
#endif
/*
* "Calculations of line pixel heights and the size of the vertical
* scrollbar."
*
* Given that tag, font and elide changes can happen to large numbers of
* diverse chunks in a text widget containing megabytes of text, it is not
* possible to recalculate all affected height information immediately any
* such change takes place and maintain a responsive user-experience. Yet, for
* an accurate vertical scrollbar to be drawn, we must know the total number
* of vertical pixels shown on display versus the number available to be
* displayed.
*
* The way the text widget solves this problem is by maintaining cached line
* pixel heights (in the BTree for each logical line), and having asynchronous
* timer callbacks (i) to iterate through the logical lines recalculating
* their heights, and (ii) to recalculate the vertical scrollbar's position
* and size.
*
* Typically this works well but there are some situations where the overall
* functional design of this file causes some problems. These problems can
* only arise because the calculations used to display lines on screen are not
* connected to those in the iterating-line- recalculation-process.
*
* The reason for this disconnect is that the display calculations operate in
* display lines, and the iteration and cache operates in logical lines.
* Given that the display calculations both need not contain complete logical
* lines (at top or bottom of display), and that they do not actually keep
* track of logical lines (for simplicity of code and historical design), this
* means a line may be known and drawn with a different pixel height to that
* which is cached in the BTree, and this might cause some temporary
* undesirable mismatch between display and the vertical scrollbar.
*
* All such mismatches should be temporary, however, since the asynchronous
* height calculations will always catch up eventually.
*
* For further details see the comments before and within the following
* functions below: LayoutDLine, AsyncUpdateLineMetrics, GetYView,
* GetYPixelCount, TkTextUpdateOneLine, TkTextUpdateLineMetrics.
*
* For details of the way in which the BTree keeps track of pixel heights, see
* tkTextBTree.c. Basically the BTree maintains two pieces of information: the
* logical line indices and the pixel height cache.
*/
/*
* TK_LAYOUT_WITH_BASE_CHUNKS:
*
* With this macro set, collect all char chunks that have no holes
* between them, that are on the same line and use the same font and font
* size. Allocate the chars of all these chunks, the so-called "stretch",
* in a DString in the first chunk, the so-called "base chunk". Use the
* base chunk string for measuring and drawing, so that these actions are
* always performed with maximum context.
*
* This is necessary for text rendering engines that provide ligatures
* and sub-pixel layout, like ATSU on Mac. If we don't do this, the
* measuring will change all the time, leading to an ugly "tremble and
* shiver" effect. This is because of the continuous splitting and
* re-merging of chunks that goes on in a text widget, when the cursor or
* the selection move.
*
* Side effects:
*
* Memory management changes. Instead of attaching the character data to
* the clientData structures of the char chunks, an additional DString is
* used. The collection process will even lead to resizing this DString
* for large stretches (> TCL_DSTRING_STATIC_SIZE == 200). We could
* reduce the overall memory footprint by copying the result to a plain
* char array after the line breaking process, but that would complicate
* the code and make performance even worse speedwise. See also TODOs.
*
* TODOs:
*
* - Move the character collection process from the LayoutProc into
* LayoutDLine(), so that the collection can be done before actual
* layout. In this way measuring can look at the following text, too,
* right from the beginning. Memory handling can also be improved with
* this. Problem: We don't easily know which chunks are adjacent until
* all the other chunks have calculated their width. Apparently marks
* would return width==0. A separate char collection loop would have to
* know these things.
*
* - Use a new context parameter to pass the context from LayoutDLine() to
* the LayoutProc instead of using a global variable like now. Not
* pressing until the previous point gets implemented.
*/
/*
* The following structure describes how to display a range of characters.
* The information is generated by scanning all of the tags associated with
* the characters and combining that with default information for the overall
* widget. These structures form the hash keys for dInfoPtr->styleTable.
*/
typedef struct StyleValues {
Tk_3DBorder border; /* Used for drawing background under text.
* NULL means use widget background. */
int borderWidth; /* Width of 3-D border for background. */
int relief; /* 3-D relief for background. */
Pixmap bgStipple; /* Stipple bitmap for background. None means
* draw solid. */
XColor *fgColor; /* Foreground color for text. */
Tk_Font tkfont; /* Font for displaying text. */
Pixmap fgStipple; /* Stipple bitmap for text and other
* foreground stuff. None means draw solid.*/
int justify; /* Justification style for text. */
int lMargin1; /* Left margin, in pixels, for first display
* line of each text line. */
int lMargin2; /* Left margin, in pixels, for second and
* later display lines of each text line. */
int offset; /* Offset in pixels of baseline, relative to
* baseline of line. */
int overstrike; /* Non-zero means draw overstrike through
* text. */
int rMargin; /* Right margin, in pixels. */
int spacing1; /* Spacing above first dline in text line. */
int spacing2; /* Spacing between lines of dline. */
int spacing3; /* Spacing below last dline in text line. */
TkTextTabArray *tabArrayPtr;/* Locations and types of tab stops (may be
* NULL). */
int tabStyle; /* One of TABULAR or WORDPROCESSOR. */
int underline; /* Non-zero means draw underline underneath
* text. */
int elide; /* Zero means draw text, otherwise not. */
TkWrapMode wrapMode; /* How to handle wrap-around for this tag.
* One of TEXT_WRAPMODE_CHAR,
* TEXT_WRAPMODE_NONE or TEXT_WRAPMODE_WORD.*/
} StyleValues;
/*
* The following structure extends the StyleValues structure above with
* graphics contexts used to actually draw the characters. The entries in
* dInfoPtr->styleTable point to structures of this type.
*/
typedef struct TextStyle {
int refCount; /* Number of times this structure is
* referenced in Chunks. */
GC bgGC; /* Graphics context for background. None means
* use widget background. */
GC fgGC; /* Graphics context for foreground. */
StyleValues *sValuePtr; /* Raw information from which GCs were
* derived. */
Tcl_HashEntry *hPtr; /* Pointer to entry in styleTable. Used to
* delete entry. */
} TextStyle;
/*
* The following macro determines whether two styles have the same background
* so that, for example, no beveled border should be drawn between them.
*/
#define SAME_BACKGROUND(s1, s2) \
(((s1)->sValuePtr->border == (s2)->sValuePtr->border) \
&& ((s1)->sValuePtr->borderWidth == (s2)->sValuePtr->borderWidth) \
&& ((s1)->sValuePtr->relief == (s2)->sValuePtr->relief) \
&& ((s1)->sValuePtr->bgStipple == (s2)->sValuePtr->bgStipple))
/*
* The following macro is used to compare two floating-point numbers to within
* a certain degree of scale. Direct comparison fails on processors where the
* processor and memory representations of FP numbers of a particular
* precision is different (e.g. Intel)
*/
#define FP_EQUAL_SCALE(double1, double2, scaleFactor) \
(fabs((double1)-(double2))*((scaleFactor)+1.0) < 0.3)
/*
* Macro to make debugging/testing logging a little easier.
*/
#define LOG(toVar,what) \
Tcl_SetVar2(textPtr->interp, toVar, NULL, (what), \
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT)
/*
* The following structure describes one line of the display, which may be
* either part or all of one line of the text.
*/
typedef struct DLine {
TkTextIndex index; /* Identifies first character in text that is
* displayed on this line. */
int byteCount; /* Number of bytes accounted for by this
* display line, including a trailing space or
* newline that isn't actually displayed. */
int logicalLinesMerged; /* Number of extra logical lines merged into
* this one due to elided newlines. */
int y; /* Y-position at which line is supposed to be
* drawn (topmost pixel of rectangular area
* occupied by line). */
int oldY; /* Y-position at which line currently appears
* on display. This is used to move lines by
* scrolling rather than re-drawing. If
* 'flags' have the OLD_Y_INVALID bit set,
* then we will never examine this field
* (which means line isn't currently visible
* on display and must be redrawn). */
int height; /* Height of line, in pixels. */
int baseline; /* Offset of text baseline from y, in
* pixels. */
int spaceAbove; /* How much extra space was added to the top
* of the line because of spacing options.
* This is included in height and baseline. */
int spaceBelow; /* How much extra space was added to the
* bottom of the line because of spacing
* options. This is included in height. */
int length; /* Total length of line, in pixels. */
TkTextDispChunk *chunkPtr; /* Pointer to first chunk in list of all of
* those that are displayed on this line of
* the screen. */
struct DLine *nextPtr; /* Next in list of all display lines for this
* window. The list is sorted in order from
* top to bottom. Note: the next DLine doesn't
* always correspond to the next line of text:
* (a) can have multiple DLines for one text
* line, and (b) can have gaps where DLine's
* have been deleted because they're out of
* date. */
int flags; /* Various flag bits: see below for values. */
} DLine;
/*
* Flag bits for DLine structures:
*
* HAS_3D_BORDER - Non-zero means that at least one of the chunks
* in this line has a 3D border, so it
* potentially interacts with 3D borders in
* neighboring lines (see DisplayLineBackground).
* NEW_LAYOUT - Non-zero means that the line has been
* re-layed out since the last time the display
* was updated.
* TOP_LINE - Non-zero means that this was the top line in
* in the window the last time that the window
* was laid out. This is important because a line
* may be displayed differently if its at the top
* or bottom than if it's in the middle
* (e.g. beveled edges aren't displayed for
* middle lines if the adjacent line has a
* similar background).
* BOTTOM_LINE - Non-zero means that this was the bottom line
* in the window the last time that the window
* was laid out.
* OLD_Y_INVALID - The value of oldY in the structure is not
* valid or useful and should not be examined.
* 'oldY' is only useful when the DLine is
* currently displayed at a different position
* and we wish to re-display it via scrolling, so
* this means the DLine needs redrawing.
*/
#define HAS_3D_BORDER 1
#define NEW_LAYOUT 2
#define TOP_LINE 4
#define BOTTOM_LINE 8
#define OLD_Y_INVALID 16
/*
* Overall display information for a text widget:
*/
typedef struct TextDInfo {
Tcl_HashTable styleTable; /* Hash table that maps from StyleValues to
* TextStyles for this widget. */
DLine *dLinePtr; /* First in list of all display lines for this
* widget, in order from top to bottom. */
int topPixelOffset; /* Identifies first pixel in top display line
* to display in window. */
int newTopPixelOffset; /* Desired first pixel in top display line to
* display in window. */
GC copyGC; /* Graphics context for copying from off-
* screen pixmaps onto screen. */
GC scrollGC; /* Graphics context for copying from one place
* in the window to another (scrolling):
* differs from copyGC in that we need to get
* GraphicsExpose events. */
int x; /* First x-coordinate that may be used for
* actually displaying line information.
* Leaves space for border, etc. */
int y; /* First y-coordinate that may be used for
* actually displaying line information.
* Leaves space for border, etc. */
int maxX; /* First x-coordinate to right of available
* space for displaying lines. */
int maxY; /* First y-coordinate below available space
* for displaying lines. */
int topOfEof; /* Top-most pixel (lowest y-value) that has
* been drawn in the appropriate fashion for
* the portion of the window after the last
* line of the text. This field is used to
* figure out when to redraw part or all of
* the eof field. */
/*
* Information used for scrolling:
*/
int newXPixelOffset; /* Desired x scroll position, measured as the
* number of pixels off-screen to the left for
* a line with no left margin. */
int curXPixelOffset; /* Actual x scroll position, measured as the
* number of pixels off-screen to the left. */
int maxLength; /* Length in pixels of longest line that's
* visible in window (length may exceed window
* size). If there's no wrapping, this will be
* zero. */
double xScrollFirst, xScrollLast;
/* Most recent values reported to horizontal
* scrollbar; used to eliminate unnecessary
* reports. */
double yScrollFirst, yScrollLast;
/* Most recent values reported to vertical
* scrollbar; used to eliminate unnecessary
* reports. */
/*
* The following information is used to implement scanning:
*/
int scanMarkXPixel; /* Pixel index of left edge of the window when
* the scan started. */
int scanMarkX; /* X-position of mouse at time scan started. */
int scanTotalYScroll; /* Total scrolling (in screen pixels) that has
* occurred since scanMarkY was set. */
int scanMarkY; /* Y-position of mouse at time scan started. */
/*
* Miscellaneous information:
*/
int dLinesInvalidated; /* This value is set to 1 whenever something
* happens that invalidates information in
* DLine structures; if a redisplay is in
* progress, it will see this and abort the
* redisplay. This is needed because, for
* example, an embedded window could change
* its size when it is first displayed,
* invalidating the DLine that is currently
* being displayed. If redisplay continues, it
* will use freed memory and could dump
* core. */
int flags; /* Various flag values: see below for
* definitions. */
/*
* Information used to handle the asynchronous updating of the y-scrollbar
* and the vertical height calculations:
*/
int lineMetricUpdateEpoch; /* Stores a number which is incremented each
* time the text widget changes in a
* significant way (e.g. resizing or
* geometry-influencing tag changes). */
int currentMetricUpdateLine;/* Stores a counter which is used to iterate
* over the logical lines contained in the
* widget and update their geometry
* calculations, if they are out of date. */
TkTextIndex metricIndex; /* If the current metric update line wraps
* into very many display lines, then this is
* used to keep track of what index we've got
* to so far... */
int metricPixelHeight; /* ...and this is for the height calculation
* so far...*/
int metricEpoch; /* ...and this for the epoch of the partial
* calculation so it can be cancelled if
* things change once more. This field will be
* -1 if there is no long-line calculation in
* progress, and take a non-negative value if
* there is such a calculation in progress. */
int lastMetricUpdateLine; /* When the current update line reaches this
* line, we are done and should stop the
* asychronous callback mechanism. */
Tcl_TimerToken lineUpdateTimer;
/* A token pointing to the current line metric
* update callback. */
Tcl_TimerToken scrollbarTimer;
/* A token pointing to the current scrollbar
* update callback. */
} TextDInfo;
/*
* In TkTextDispChunk structures for character segments, the clientData field
* points to one of the following structures:
*/
#if !TK_LAYOUT_WITH_BASE_CHUNKS
typedef struct CharInfo {
int numBytes; /* Number of bytes to display. */
char chars[4]; /* UTF characters to display. Actual size will
* be numBytes, not 4. THIS MUST BE THE LAST
* FIELD IN THE STRUCTURE. */
} CharInfo;
#else /* TK_LAYOUT_WITH_BASE_CHUNKS */
typedef struct CharInfo {
TkTextDispChunk *baseChunkPtr;
int baseOffset; /* Starting offset in base chunk
* baseChars. */
int numBytes; /* Number of bytes that belong to this
* chunk. */
const char *chars; /* UTF characters to display. Actually points
* into the baseChars of the base chunk. Only
* valid after FinalizeBaseChunk(). */
} CharInfo;
/*
* The BaseCharInfo is a CharInfo with some additional data added.
*/
typedef struct BaseCharInfo {
CharInfo ci;
Tcl_DString baseChars; /* Actual characters for the stretch of text
* represented by this base chunk. */
int width; /* Width in pixels of the whole string, if
* known, else -1. Valid during
* LayoutDLine(). */
} BaseCharInfo;
static TkTextDispChunk *baseCharChunkPtr = NULL;
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
/*
* Flag values for TextDInfo structures:
*
* DINFO_OUT_OF_DATE: Non-zero means that the DLine structures for
* this window are partially or completely out of
* date and need to be recomputed.
* REDRAW_PENDING: Means that a when-idle handler has been
* scheduled to update the display.
* REDRAW_BORDERS: Means window border or pad area has
* potentially been damaged and must be redrawn.
* REPICK_NEEDED: 1 means that the widget has been modified in a
* way that could change the current character (a
* different character might be under the mouse
* cursor now). Need to recompute the current
* character before the next redisplay.
*/
#define DINFO_OUT_OF_DATE 1
#define REDRAW_PENDING 2
#define REDRAW_BORDERS 4
#define REPICK_NEEDED 8
/*
* Action values for FreeDLines:
*
* DLINE_FREE: Free the lines, but no need to unlink them from the
* current list of actual display lines.
* DLINE_UNLINK: Free and unlink from current display.
* DLINE_FREE_TEMP: Free, but don't unlink, and also don't set
* 'dLinesInvalidated'.
*/
#define DLINE_FREE 0
#define DLINE_UNLINK 1
#define DLINE_FREE_TEMP 2
/*
* The following counters keep statistics about redisplay that can be checked
* to see how clever this code is at reducing redisplays.
*/
static int numRedisplays; /* Number of calls to DisplayText. */
static int linesRedrawn; /* Number of calls to DisplayDLine. */
static int numCopies; /* Number of calls to XCopyArea to copy part
* of the screen. */
static int lineHeightsRecalculated;
/* Number of line layouts purely for height
* calculation purposes.*/
/*
* Forward declarations for functions defined later in this file:
*/
static void AdjustForTab(TkText *textPtr,
TkTextTabArray *tabArrayPtr, int index,
TkTextDispChunk *chunkPtr);
static void CharBboxProc(TkText *textPtr,
TkTextDispChunk *chunkPtr, int index, int y,
int lineHeight, int baseline, int *xPtr,
int *yPtr, int *widthPtr, int *heightPtr);
static int CharChunkMeasureChars(TkTextDispChunk *chunkPtr,
const char *chars, int charsLen,
int start, int end, int startX, int maxX,
int flags, int *nextX);
static void CharDisplayProc(TkText *textPtr,
TkTextDispChunk *chunkPtr, int x, int y,
int height, int baseline, Display *display,
Drawable dst, int screenY);
static int CharMeasureProc(TkTextDispChunk *chunkPtr, int x);
static void CharUndisplayProc(TkText *textPtr,
TkTextDispChunk *chunkPtr);
#if TK_LAYOUT_WITH_BASE_CHUNKS
static void FinalizeBaseChunk(TkTextDispChunk *additionalChunkPtr);
static void FreeBaseChunk(TkTextDispChunk *baseChunkPtr);
static int IsSameFGStyle(TextStyle *style1, TextStyle *style2);
static void RemoveFromBaseChunk(TkTextDispChunk *chunkPtr);
#endif
/*
* Definitions of elided procs. Compiler can't inline these since we use
* pointers to these functions. ElideDisplayProc and ElideUndisplayProc are
* special-cased for speed, as potentially many elided DLine chunks if large,
* tag toggle-filled elided region.
*/
static void ElideBboxProc(TkText *textPtr,
TkTextDispChunk *chunkPtr, int index, int y,
int lineHeight, int baseline, int *xPtr,
int *yPtr, int *widthPtr, int *heightPtr);
static int ElideMeasureProc(TkTextDispChunk *chunkPtr, int x);
static void DisplayDLine(TkText *textPtr, DLine *dlPtr,
DLine *prevPtr, Pixmap pixmap);
static void DisplayLineBackground(TkText *textPtr, DLine *dlPtr,
DLine *prevPtr, Pixmap pixmap);
static void DisplayText(ClientData clientData);
static DLine * FindDLine(TkText *textPtr, DLine *dlPtr,
CONST TkTextIndex *indexPtr);
static void FreeDLines(TkText *textPtr, DLine *firstPtr,
DLine *lastPtr, int action);
static void FreeStyle(TkText *textPtr, TextStyle *stylePtr);
static TextStyle * GetStyle(TkText *textPtr, CONST TkTextIndex *indexPtr);
static void GetXView(Tcl_Interp *interp, TkText *textPtr,
int report);
static void GetYView(Tcl_Interp *interp, TkText *textPtr,
int report);
static int GetYPixelCount(TkText *textPtr, DLine *dlPtr);
static DLine * LayoutDLine(TkText *textPtr,
CONST TkTextIndex *indexPtr);
static int MeasureChars(Tk_Font tkfont, CONST char *source,
int maxBytes, int rangeStart, int rangeLength,
int startX, int maxX, int flags, int *nextXPtr);
static void MeasureUp(TkText *textPtr,
CONST TkTextIndex *srcPtr, int distance,
TkTextIndex *dstPtr, int *overlap);
static int NextTabStop(Tk_Font tkfont, int x, int tabOrigin);
static void UpdateDisplayInfo(TkText *textPtr);
static void YScrollByLines(TkText *textPtr, int offset);
static void YScrollByPixels(TkText *textPtr, int offset);
static int SizeOfTab(TkText *textPtr, int tabStyle,
TkTextTabArray *tabArrayPtr, int *indexPtr, int x,
int maxX);
static void TextChanged(TkText *textPtr,
CONST TkTextIndex *index1Ptr,
CONST TkTextIndex *index2Ptr);
static void TextInvalidateRegion(TkText *textPtr, TkRegion region);
static void TextRedrawTag(TkText *textPtr,
TkTextIndex *index1Ptr, TkTextIndex *index2Ptr,
TkTextTag *tagPtr, int withTag);
static void TextInvalidateLineMetrics(TkText *textPtr,
TkTextLine *linePtr, int lineCount, int action);
static int CalculateDisplayLineHeight(TkText *textPtr,
CONST TkTextIndex *indexPtr, int *byteCountPtr,
int *mergedLinePtr);
static void DlineIndexOfX(TkText *textPtr,
DLine *dlPtr, int x, TkTextIndex *indexPtr);
static int DlineXOfIndex(TkText *textPtr,
DLine *dlPtr, int byteIndex);
static int TextGetScrollInfoObj(Tcl_Interp *interp,
TkText *textPtr, int objc,
Tcl_Obj *CONST objv[], double *dblPtr,
int *intPtr);
static void AsyncUpdateLineMetrics(ClientData clientData);
static void AsyncUpdateYScrollbar(ClientData clientData);
/*
* Result values returned by TextGetScrollInfoObj:
*/
#define TKTEXT_SCROLL_MOVETO 1
#define TKTEXT_SCROLL_PAGES 2
#define TKTEXT_SCROLL_UNITS 3
#define TKTEXT_SCROLL_ERROR 4
#define TKTEXT_SCROLL_PIXELS 5
/*
*----------------------------------------------------------------------
*
* TkTextCreateDInfo --
*
* This function is called when a new text widget is created. Its job is
* to set up display-related information for the widget.
*
* Results:
* None.
*
* Side effects:
* A TextDInfo data structure is allocated and initialized and attached
* to textPtr.
*
*----------------------------------------------------------------------
*/
void
TkTextCreateDInfo(
TkText *textPtr) /* Overall information for text widget. */
{
register TextDInfo *dInfoPtr;
XGCValues gcValues;
dInfoPtr = (TextDInfo *) ckalloc(sizeof(TextDInfo));
Tcl_InitHashTable(&dInfoPtr->styleTable, sizeof(StyleValues)/sizeof(int));
dInfoPtr->dLinePtr = NULL;
dInfoPtr->copyGC = None;
gcValues.graphics_exposures = True;
dInfoPtr->scrollGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures,
&gcValues);
dInfoPtr->topOfEof = 0;
dInfoPtr->newXPixelOffset = 0;
dInfoPtr->curXPixelOffset = 0;
dInfoPtr->maxLength = 0;
dInfoPtr->xScrollFirst = -1;
dInfoPtr->xScrollLast = -1;
dInfoPtr->yScrollFirst = -1;
dInfoPtr->yScrollLast = -1;
dInfoPtr->scanMarkXPixel = 0;
dInfoPtr->scanMarkX = 0;
dInfoPtr->scanTotalYScroll = 0;
dInfoPtr->scanMarkY = 0;
dInfoPtr->dLinesInvalidated = 0;
dInfoPtr->flags = DINFO_OUT_OF_DATE;
dInfoPtr->topPixelOffset = 0;
dInfoPtr->newTopPixelOffset = 0;
dInfoPtr->currentMetricUpdateLine = -1;
dInfoPtr->lastMetricUpdateLine = -1;
dInfoPtr->lineMetricUpdateEpoch = 1;
dInfoPtr->metricEpoch = -1;
dInfoPtr->metricIndex.textPtr = NULL;
dInfoPtr->metricIndex.linePtr = NULL;
/*
* Add a refCount for each of the idle call-backs.
*/
textPtr->refCount++;
dInfoPtr->lineUpdateTimer = Tcl_CreateTimerHandler(0,
AsyncUpdateLineMetrics, (ClientData) textPtr);
textPtr->refCount++;
dInfoPtr->scrollbarTimer = Tcl_CreateTimerHandler(200,
AsyncUpdateYScrollbar, (ClientData) textPtr);
textPtr->dInfoPtr = dInfoPtr;
}
/*
*----------------------------------------------------------------------
*
* TkTextFreeDInfo --
*
* This function is called to free up all of the private display
* information kept by this file for a text widget.
*
* Results:
* None.
*
* Side effects:
* Lots of resources get freed.
*
*----------------------------------------------------------------------
*/
void
TkTextFreeDInfo(
TkText *textPtr) /* Overall information for text widget. */
{
register TextDInfo *dInfoPtr = textPtr->dInfoPtr;
/*
* Be careful to free up styleTable *after* freeing up all the DLines, so
* that the hash table is still intact to free up the style-related
* information from the lines. Once the lines are all free then styleTable
* will be empty.
*/
FreeDLines(textPtr, dInfoPtr->dLinePtr, NULL, DLINE_UNLINK);
Tcl_DeleteHashTable(&dInfoPtr->styleTable);
if (dInfoPtr->copyGC != None) {
Tk_FreeGC(textPtr->display, dInfoPtr->copyGC);
}
Tk_FreeGC(textPtr->display, dInfoPtr->scrollGC);
if (dInfoPtr->flags & REDRAW_PENDING) {
Tcl_CancelIdleCall(DisplayText, (ClientData) textPtr);
}
if (dInfoPtr->lineUpdateTimer != NULL) {
Tcl_DeleteTimerHandler(dInfoPtr->lineUpdateTimer);
textPtr->refCount--;
dInfoPtr->lineUpdateTimer = NULL;
}
if (dInfoPtr->scrollbarTimer != NULL) {
Tcl_DeleteTimerHandler(dInfoPtr->scrollbarTimer);
textPtr->refCount--;
dInfoPtr->scrollbarTimer = NULL;
}
ckfree((char *) dInfoPtr);
}
/*
*----------------------------------------------------------------------
*
* GetStyle --
*
* This function creates all the information needed to display text at a
* particular location.
*
* Results:
* The return value is a pointer to a TextStyle structure that
* corresponds to *sValuePtr.
*
* Side effects:
* A new entry may be created in the style table for the widget.
*
*----------------------------------------------------------------------
*/
static TextStyle *
GetStyle(
TkText *textPtr, /* Overall information about text widget. */
CONST TkTextIndex *indexPtr)/* The character in the text for which display
* information is wanted. */
{
TkTextTag **tagPtrs;
register TkTextTag *tagPtr;
StyleValues styleValues;
TextStyle *stylePtr;
Tcl_HashEntry *hPtr;
int numTags, isNew, i;
XGCValues gcValues;
unsigned long mask;
/*
* The variables below keep track of the highest-priority specification
* that has occurred for each of the various fields of the StyleValues.
*/
int borderPrio, borderWidthPrio, reliefPrio, bgStipplePrio;
int fgPrio, fontPrio, fgStipplePrio;
int underlinePrio, elidePrio, justifyPrio, offsetPrio;
int lMargin1Prio, lMargin2Prio, rMarginPrio;
int spacing1Prio, spacing2Prio, spacing3Prio;
int overstrikePrio, tabPrio, tabStylePrio, wrapPrio;
/*
* Find out what tags are present for the character, then compute a
* StyleValues structure corresponding to those tags (scan through all of
* the tags, saving information for the highest-priority tag).
*/
tagPtrs = TkBTreeGetTags(indexPtr, textPtr, &numTags);
borderPrio = borderWidthPrio = reliefPrio = bgStipplePrio = -1;
fgPrio = fontPrio = fgStipplePrio = -1;
underlinePrio = elidePrio = justifyPrio = offsetPrio = -1;
lMargin1Prio = lMargin2Prio = rMarginPrio = -1;
spacing1Prio = spacing2Prio = spacing3Prio = -1;
overstrikePrio = tabPrio = tabStylePrio = wrapPrio = -1;
memset(&styleValues, 0, sizeof(StyleValues));
styleValues.relief = TK_RELIEF_FLAT;
styleValues.fgColor = textPtr->fgColor;
styleValues.tkfont = textPtr->tkfont;
styleValues.justify = TK_JUSTIFY_LEFT;
styleValues.spacing1 = textPtr->spacing1;
styleValues.spacing2 = textPtr->spacing2;
styleValues.spacing3 = textPtr->spacing3;
styleValues.tabArrayPtr = textPtr->tabArrayPtr;
styleValues.tabStyle = textPtr->tabStyle;
styleValues.wrapMode = textPtr->wrapMode;
styleValues.elide = 0;
for (i = 0 ; i < numTags; i++) {
Tk_3DBorder border;
tagPtr = tagPtrs[i];
border = tagPtr->border;
/*
* If this is the selection tag, and inactiveSelBorder is NULL (the
* default on Windows), then we need to skip it if we don't have the
* focus.
*/
if ((tagPtr == textPtr->selTagPtr) && !(textPtr->flags & GOT_FOCUS)) {
if (textPtr->inactiveSelBorder == NULL
#ifdef MAC_OSX_TK
/* Don't show inactive selection in disabled widgets. */
|| textPtr->state == TK_TEXT_STATE_DISABLED
#endif
) {
continue;
}
border = textPtr->inactiveSelBorder;
}
if ((border != NULL) && (tagPtr->priority > borderPrio)) {
styleValues.border = border;
borderPrio = tagPtr->priority;
}
if ((tagPtr->borderWidthPtr != NULL)
&& (Tcl_GetString(tagPtr->borderWidthPtr)[0] != '\0')
&& (tagPtr->priority > borderWidthPrio)) {
styleValues.borderWidth = tagPtr->borderWidth;
borderWidthPrio = tagPtr->priority;
}
if ((tagPtr->reliefString != NULL)
&& (tagPtr->priority > reliefPrio)) {
if (styleValues.border == NULL) {
styleValues.border = textPtr->border;
}
styleValues.relief = tagPtr->relief;
reliefPrio = tagPtr->priority;
}
if ((tagPtr->bgStipple != None)
&& (tagPtr->priority > bgStipplePrio)) {
styleValues.bgStipple = tagPtr->bgStipple;
bgStipplePrio = tagPtr->priority;
}
if ((tagPtr->fgColor != None) && (tagPtr->priority > fgPrio)) {
styleValues.fgColor = tagPtr->fgColor;
fgPrio = tagPtr->priority;
}
if ((tagPtr->tkfont != None) && (tagPtr->priority > fontPrio)) {
styleValues.tkfont = tagPtr->tkfont;
fontPrio = tagPtr->priority;
}
if ((tagPtr->fgStipple != None)
&& (tagPtr->priority > fgStipplePrio)) {
styleValues.fgStipple = tagPtr->fgStipple;
fgStipplePrio = tagPtr->priority;
}
if ((tagPtr->justifyString != NULL)
&& (tagPtr->priority > justifyPrio)) {
styleValues.justify = tagPtr->justify;
justifyPrio = tagPtr->priority;
}
if ((tagPtr->lMargin1String != NULL)
&& (tagPtr->priority > lMargin1Prio)) {
styleValues.lMargin1 = tagPtr->lMargin1;
lMargin1Prio = tagPtr->priority;
}
if ((tagPtr->lMargin2String != NULL)
&& (tagPtr->priority > lMargin2Prio)) {
styleValues.lMargin2 = tagPtr->lMargin2;
lMargin2Prio = tagPtr->priority;
}
if ((tagPtr->offsetString != NULL)
&& (tagPtr->priority > offsetPrio)) {
styleValues.offset = tagPtr->offset;
offsetPrio = tagPtr->priority;
}
if ((tagPtr->overstrikeString != NULL)
&& (tagPtr->priority > overstrikePrio)) {
styleValues.overstrike = tagPtr->overstrike;
overstrikePrio = tagPtr->priority;
}
if ((tagPtr->rMarginString != NULL)
&& (tagPtr->priority > rMarginPrio)) {
styleValues.rMargin = tagPtr->rMargin;
rMarginPrio = tagPtr->priority;
}
if ((tagPtr->spacing1String != NULL)
&& (tagPtr->priority > spacing1Prio)) {
styleValues.spacing1 = tagPtr->spacing1;
spacing1Prio = tagPtr->priority;
}
if ((tagPtr->spacing2String != NULL)
&& (tagPtr->priority > spacing2Prio)) {
styleValues.spacing2 = tagPtr->spacing2;
spacing2Prio = tagPtr->priority;
}
if ((tagPtr->spacing3String != NULL)
&& (tagPtr->priority > spacing3Prio)) {
styleValues.spacing3 = tagPtr->spacing3;
spacing3Prio = tagPtr->priority;
}
if ((tagPtr->tabStringPtr != NULL)
&& (tagPtr->priority > tabPrio)) {
styleValues.tabArrayPtr = tagPtr->tabArrayPtr;
tabPrio = tagPtr->priority;
}
if ((tagPtr->tabStyle != TK_TEXT_TABSTYLE_NONE)
&& (tagPtr->priority > tabStylePrio)) {
styleValues.tabStyle = tagPtr->tabStyle;
tabStylePrio = tagPtr->priority;
}
if ((tagPtr->underlineString != NULL)
&& (tagPtr->priority > underlinePrio)) {
styleValues.underline = tagPtr->underline;
underlinePrio = tagPtr->priority;
}
if ((tagPtr->elideString != NULL)
&& (tagPtr->priority > elidePrio)) {
styleValues.elide = tagPtr->elide;
elidePrio = tagPtr->priority;
}
if ((tagPtr->wrapMode != TEXT_WRAPMODE_NULL)
&& (tagPtr->priority > wrapPrio)) {
styleValues.wrapMode = tagPtr->wrapMode;
wrapPrio = tagPtr->priority;
}
}
if (tagPtrs != NULL) {
ckfree((char *) tagPtrs);
}
/*
* Use an existing style if there's one around that matches.
*/
hPtr = Tcl_CreateHashEntry(&textPtr->dInfoPtr->styleTable,
(char *) &styleValues, &isNew);
if (!isNew) {
stylePtr = (TextStyle *) Tcl_GetHashValue(hPtr);
stylePtr->refCount++;
return stylePtr;
}
/*
* No existing style matched. Make a new one.
*/
stylePtr = (TextStyle *) ckalloc(sizeof(TextStyle));
stylePtr->refCount = 1;
if (styleValues.border != NULL) {
gcValues.foreground = Tk_3DBorderColor(styleValues.border)->pixel;
mask = GCForeground;
if (styleValues.bgStipple != None) {
gcValues.stipple = styleValues.bgStipple;
gcValues.fill_style = FillStippled;
mask |= GCStipple|GCFillStyle;
}
stylePtr->bgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues);
} else {
stylePtr->bgGC = None;
}
mask = GCFont;
gcValues.font = Tk_FontId(styleValues.tkfont);
mask |= GCForeground;
gcValues.foreground = styleValues.fgColor->pixel;
if (styleValues.fgStipple != None) {
gcValues.stipple = styleValues.fgStipple;
gcValues.fill_style = FillStippled;
mask |= GCStipple|GCFillStyle;
}
stylePtr->fgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues);
stylePtr->sValuePtr = (StyleValues *)
Tcl_GetHashKey(&textPtr->dInfoPtr->styleTable, hPtr);
stylePtr->hPtr = hPtr;
Tcl_SetHashValue(hPtr, stylePtr);
return stylePtr;
}
/*
*----------------------------------------------------------------------
*
* FreeStyle --
*
* This function is called when a TextStyle structure is no longer
* needed. It decrements the reference count and frees up the space for
* the style structure if the reference count is 0.
*
* Results:
* None.
*
* Side effects:
* The storage and other resources associated with the style are freed up
* if no-one's still using it.
*
*----------------------------------------------------------------------
*/
static void
FreeStyle(
TkText *textPtr, /* Information about overall widget. */
register TextStyle *stylePtr)
/* Information about style to free. */
{
stylePtr->refCount--;
if (stylePtr->refCount == 0) {
if (stylePtr->bgGC != None) {
Tk_FreeGC(textPtr->display, stylePtr->bgGC);
}
if (stylePtr->fgGC != None) {
Tk_FreeGC(textPtr->display, stylePtr->fgGC);
}
Tcl_DeleteHashEntry(stylePtr->hPtr);
ckfree((char *) stylePtr);
}
}
/*
*----------------------------------------------------------------------
*
* LayoutDLine --
*
* This function generates a single DLine structure for a display line
* whose leftmost character is given by indexPtr.
*
* Results:
* The return value is a pointer to a DLine structure describing the
* display line. All fields are filled in and correct except for y and
* nextPtr.
*
* Side effects:
* Storage is allocated for the new DLine.
*
* See the comments in 'GetYView' for some thoughts on what the side-
* effects of this call (or its callers) should be; the synchronisation
* of TkTextLine->pixelHeight with the sum of the results of this
* function operating on all display lines within each logical line.
* Ideally the code should be refactored to ensure the cached pixel
* height is never behind what is known when this function is called
* elsewhere.
*
* Unfortunately, this function is currently called from many different
* places, not just to layout a display line for actual display, but also
* simply to calculate some metric or other of one or more display lines
* (typically the height). It would be a good idea to do some profiling
* of typical text widget usage and the way in which this is called and
* see if some optimization could or should be done.
*
*----------------------------------------------------------------------
*/
static DLine *
LayoutDLine(
TkText *textPtr, /* Overall information about text widget. */
CONST TkTextIndex *indexPtr)/* Beginning of display line. May not
* necessarily point to a character
* segment. */
{
register DLine *dlPtr; /* New display line. */
TkTextSegment *segPtr; /* Current segment in text. */
TkTextDispChunk *lastChunkPtr;
/* Last chunk allocated so far for line. */
TkTextDispChunk *chunkPtr; /* Current chunk. */
TkTextIndex curIndex;
TkTextDispChunk *breakChunkPtr;
/* Chunk containing best word break point, if
* any. */
TkTextIndex breakIndex; /* Index of first character in
* breakChunkPtr. */
int breakByteOffset; /* Byte offset of character within
* breakChunkPtr just to right of best break
* point. */
int noCharsYet; /* Non-zero means that no characters have been
* placed on the line yet. */
int paragraphStart; /* Non-zero means that we are on the first
* line of a paragraph (used to choose between
* lmargin1, lmargin2). */
int justify; /* How to justify line: taken from style for
* the first character in line. */
int jIndent; /* Additional indentation (beyond margins) due
* to justification. */
int rMargin; /* Right margin width for line. */
TkWrapMode wrapMode; /* Wrap mode to use for this line. */
int x = 0, maxX = 0; /* Initializations needed only to stop
* compiler warnings. */
int wholeLine; /* Non-zero means this display line runs to
* the end of the text line. */
int tabIndex; /* Index of the current tab stop. */
int gotTab; /* Non-zero means the current chunk contains a
* tab. */
TkTextDispChunk *tabChunkPtr;
/* Pointer to the chunk containing the
* previous tab stop. */
int maxBytes; /* Maximum number of bytes to include in this
* chunk. */
TkTextTabArray *tabArrayPtr;/* Tab stops for line; taken from style for
* the first character on line. */
int tabStyle; /* One of TABULAR or WORDPROCESSOR. */
int tabSize; /* Number of pixels consumed by current tab
* stop. */
TkTextDispChunk *lastCharChunkPtr;
/* Pointer to last chunk in display lines with
* numBytes > 0. Used to drop 0-sized chunks
* from the end of the line. */
int byteOffset, ascent, descent, code, elide, elidesize;
StyleValues *sValuePtr;
TkTextElideInfo info; /* Keep track of elide state. */
/*
* Create and initialize a new DLine structure.
*/
dlPtr = (DLine *) ckalloc(sizeof(DLine));
dlPtr->index = *indexPtr;
dlPtr->byteCount = 0;
dlPtr->y = 0;
dlPtr->oldY = 0; /* Only set to avoid compiler warnings. */
dlPtr->height = 0;
dlPtr->baseline = 0;
dlPtr->chunkPtr = NULL;
dlPtr->nextPtr = NULL;
dlPtr->flags = NEW_LAYOUT | OLD_Y_INVALID;
dlPtr->logicalLinesMerged = 0;
/*
* This is not necessarily totally correct, where we have merged logical
* lines. Fixing this would require a quite significant overhaul, though,
* so currently we make do with this.
*/
paragraphStart = (indexPtr->byteIndex == 0);
/*
* Special case entirely elide line as there may be 1000s or more.
*/
elide = TkTextIsElided(textPtr, indexPtr, &info);
if (elide && indexPtr->byteIndex == 0) {
maxBytes = 0;
for (segPtr = info.segPtr; segPtr != NULL; segPtr = segPtr->nextPtr) {
if (segPtr->size > 0) {
if (elide == 0) {
/*
* We toggled a tag and the elide state changed to
* visible, and we have something of non-zero size.
* Therefore we must bail out.
*/
break;
}
maxBytes += segPtr->size;
/*
* Reset tag elide priority, since we're on a new character.
*/
} else if ((segPtr->typePtr == &tkTextToggleOffType)
|| (segPtr->typePtr == &tkTextToggleOnType)) {
TkTextTag *tagPtr = segPtr->body.toggle.tagPtr;
/*
* The elide state only changes if this tag is either the
* current highest priority tag (and is therefore being
* toggled off), or it's a new tag with higher priority.
*/
if (tagPtr->elideString != NULL) {
info.tagCnts[tagPtr->priority]++;
if (info.tagCnts[tagPtr->priority] & 1) {
info.tagPtrs[tagPtr->priority] = tagPtr;
}
if (tagPtr->priority >= info.elidePriority) {
if (segPtr->typePtr == &tkTextToggleOffType) {
/*
* If it is being toggled off, and it has an elide
* string, it must actually be the current highest
* priority tag, so this check is redundant:
*/
if (tagPtr->priority != info.elidePriority) {
Tcl_Panic("Bad tag priority being toggled off");
}
/*
* Find previous elide tag, if any (if not then
* elide will be zero, of course).
*/
elide = 0;
while (--info.elidePriority > 0) {
if (info.tagCnts[info.elidePriority] & 1) {
elide = info.tagPtrs[info.elidePriority]
->elide;
break;
}
}
} else {
elide = tagPtr->elide;
info.elidePriority = tagPtr->priority;
}
}
}
}
}
if (elide) {
dlPtr->byteCount = maxBytes;
dlPtr->spaceAbove = dlPtr->spaceBelow = dlPtr->length = 0;
if (dlPtr->index.byteIndex == 0) {
/*
* Elided state goes from beginning to end of an entire
* logical line. This means we can update the line's pixel
* height, and bring its pixel calculation up to date.
*/
TkBTreeLinePixelEpoch(textPtr, dlPtr->index.linePtr)
= textPtr->dInfoPtr->lineMetricUpdateEpoch;
if (TkBTreeLinePixelCount(textPtr,dlPtr->index.linePtr) != 0) {
TkBTreeAdjustPixelHeight(textPtr,
dlPtr->index.linePtr, 0, 0);
}
}
TkTextFreeElideInfo(&info);
return dlPtr;
}
}
TkTextFreeElideInfo(&info);
/*
* Each iteration of the loop below creates one TkTextDispChunk for the
* new display line. The line will always have at least one chunk (for the
* newline character at the end, if there's nothing else available).
*/
curIndex = *indexPtr;
lastChunkPtr = NULL;
chunkPtr = NULL;
noCharsYet = 1;
elide = 0;
breakChunkPtr = NULL;
breakByteOffset = 0;
justify = TK_JUSTIFY_LEFT;
tabIndex = -1;
tabChunkPtr = NULL;
tabArrayPtr = NULL;
tabStyle = TK_TEXT_TABSTYLE_TABULAR;
rMargin = 0;
wrapMode = TEXT_WRAPMODE_CHAR;
tabSize = 0;
lastCharChunkPtr = NULL;
/*
* Find the first segment to consider for the line. Can't call
* TkTextIndexToSeg for this because it won't return a segment with zero
* size (such as the insertion cursor's mark).
*/
connectNextLogicalLine:
byteOffset = curIndex.byteIndex;
segPtr = curIndex.linePtr->segPtr;
while ((byteOffset > 0) && (byteOffset >= segPtr->size)) {
byteOffset -= segPtr->size;
segPtr = segPtr->nextPtr;
if (segPtr == NULL) {
/*
* Two logical lines merged into one display line through eliding
* of a newline.
*/
TkTextLine *linePtr = TkBTreeNextLine(NULL, curIndex.linePtr);
if (linePtr != NULL) {
dlPtr->logicalLinesMerged++;
curIndex.byteIndex = 0;
curIndex.linePtr = linePtr;
segPtr = curIndex.linePtr->segPtr;
} else {
break;
}
}
}
while (segPtr != NULL) {
/*
* Every logical line still gets at least one chunk due to
* expectations in the rest of the code, but we are able to skip
* elided portions of the line quickly.
*
* If current chunk is elided and last chunk was too, coalese.
*
* This also means that each logical line which is entirely elided
* still gets laid out into a DLine, but with zero height. This isn't
* particularly a problem, but it does seem somewhat unnecessary. We
* may wish to redesign the code to remove these zero height DLines in
* the future.
*/
if (elide && (lastChunkPtr != NULL)
&& (lastChunkPtr->displayProc == NULL /*ElideDisplayProc*/)) {
elidesize = segPtr->size - byteOffset;
if (elidesize > 0) {
curIndex.byteIndex += elidesize;
lastChunkPtr->numBytes += elidesize;
breakByteOffset = lastChunkPtr->breakIndex
= lastChunkPtr->numBytes;
/*
* If have we have a tag toggle, there is a chance that
* invisibility state changed, so bail out.
*/
} else if ((segPtr->typePtr == &tkTextToggleOffType)
|| (segPtr->typePtr == &tkTextToggleOnType)) {
if (segPtr->body.toggle.tagPtr->elideString != NULL) {
elide = (segPtr->typePtr == &tkTextToggleOffType)
^ segPtr->body.toggle.tagPtr->elide;
}
}
byteOffset = 0;
segPtr = segPtr->nextPtr;
if (segPtr == NULL) {
/*
* Two logical lines merged into one display line through
* eliding of a newline.
*/
TkTextLine *linePtr = TkBTreeNextLine(NULL, curIndex.linePtr);
if (linePtr != NULL) {
dlPtr->logicalLinesMerged++;
curIndex.byteIndex = 0;
curIndex.linePtr = linePtr;
goto connectNextLogicalLine;
}
}
/*
* Code no longer needed, now that we allow logical lines to merge
* into a single display line.
*
if (segPtr == NULL && chunkPtr != NULL) {
ckfree((char *) chunkPtr);
chunkPtr = NULL;
}
*/
continue;
}
if (segPtr->typePtr->layoutProc == NULL) {
segPtr = segPtr->nextPtr;
byteOffset = 0;
continue;
}
if (chunkPtr == NULL) {
chunkPtr = (TkTextDispChunk *) ckalloc(sizeof(TkTextDispChunk));
chunkPtr->nextPtr = NULL;
chunkPtr->clientData = NULL;
}
chunkPtr->stylePtr = GetStyle(textPtr, &curIndex);
elide = chunkPtr->stylePtr->sValuePtr->elide;
/*
* Save style information such as justification and indentation, up
* until the first character is encountered, then retain that
* information for the rest of the line.
*/
if (!elide && noCharsYet) {
tabArrayPtr = chunkPtr->stylePtr->sValuePtr->tabArrayPtr;
tabStyle = chunkPtr->stylePtr->sValuePtr->tabStyle;
justify = chunkPtr->stylePtr->sValuePtr->justify;
rMargin = chunkPtr->stylePtr->sValuePtr->rMargin;
wrapMode = chunkPtr->stylePtr->sValuePtr->wrapMode;
/*
* See above - this test may not be entirely correct where we have
* partially elided lines (and therefore merged logical lines).
* In such a case a byteIndex of zero doesn't necessarily mean the
* beginning of a logical line.
*/
if (paragraphStart) {
/*
* Beginning of logical line.
*/
x = chunkPtr->stylePtr->sValuePtr->lMargin1;
} else {
/*
* Beginning of display line.
*/
x = chunkPtr->stylePtr->sValuePtr->lMargin2;
}
if (wrapMode == TEXT_WRAPMODE_NONE) {
maxX = -1;
} else {
maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x
- rMargin;
if (maxX < x) {
maxX = x;
}
}
}
gotTab = 0;
maxBytes = segPtr->size - byteOffset;
if (segPtr->typePtr == &tkTextCharType) {
/*
* See if there is a tab in the current chunk; if so, only layout
* characters up to (and including) the tab.
*/
if (!elide && justify == TK_JUSTIFY_LEFT) {
char *p;
for (p = segPtr->body.chars + byteOffset; *p != 0; p++) {
if (*p == '\t') {
maxBytes = (p + 1 - segPtr->body.chars) - byteOffset;
gotTab = 1;
break;
}
}
}
#if TK_LAYOUT_WITH_BASE_CHUNKS
if (baseCharChunkPtr != NULL) {
int expectedX =
((BaseCharInfo *) baseCharChunkPtr->clientData)->width
+ baseCharChunkPtr->x;
if ((expectedX != x) || !IsSameFGStyle(
baseCharChunkPtr->stylePtr, chunkPtr->stylePtr)) {
FinalizeBaseChunk(NULL);
}
}
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
}
chunkPtr->x = x;
if (elide /*&& maxBytes*/) {
/*
* Don't free style here, as other code expects to be able to do
* that.
*/
/* breakByteOffset =*/
chunkPtr->breakIndex = chunkPtr->numBytes = maxBytes;
chunkPtr->width = 0;
chunkPtr->minAscent = chunkPtr->minDescent
= chunkPtr->minHeight = 0;
/*
* Would just like to point to canonical empty chunk.
*/
chunkPtr->displayProc = NULL;
chunkPtr->undisplayProc = NULL;
chunkPtr->measureProc = ElideMeasureProc;
chunkPtr->bboxProc = ElideBboxProc;
code = 1;
} else {
code = (*segPtr->typePtr->layoutProc)(textPtr, &curIndex, segPtr,
byteOffset, maxX-tabSize, maxBytes, noCharsYet, wrapMode,
chunkPtr);
}
if (code <= 0) {
FreeStyle(textPtr, chunkPtr->stylePtr);
if (code < 0) {
/*
* This segment doesn't wish to display itself (e.g. most
* marks).
*/
segPtr = segPtr->nextPtr;
byteOffset = 0;
continue;
}
/*
* No characters from this segment fit in the window: this means
* we're at the end of the display line.
*/
if (chunkPtr != NULL) {
ckfree((char *) chunkPtr);
}
break;
}
/*
* We currently say we have some characters (and therefore something
* from which to examine tag values for the first character of the
* line) even if those characters are actually elided. This behaviour
* is not well documented, and it might be more consistent to
* completely ignore such elided characters and their tags. To do so
* change this to:
*
* if (!elide && chunkPtr->numBytes > 0).
*/
if (!elide && chunkPtr->numBytes > 0) {
noCharsYet = 0;
lastCharChunkPtr = chunkPtr;
}
if (lastChunkPtr == NULL) {
dlPtr->chunkPtr = chunkPtr;
} else {
lastChunkPtr->nextPtr = chunkPtr;
}
lastChunkPtr = chunkPtr;
x += chunkPtr->width;
if (chunkPtr->breakIndex > 0) {
breakByteOffset = chunkPtr->breakIndex;
breakIndex = curIndex;
breakChunkPtr = chunkPtr;
}
if (chunkPtr->numBytes != maxBytes) {
break;
}
/*
* If we're at a new tab, adjust the layout for all the chunks
* pertaining to the previous tab. Also adjust the amount of space
* left in the line to account for space that will be eaten up by the
* tab.
*/
if (gotTab) {
if (tabIndex >= 0) {
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
x = chunkPtr->x + chunkPtr->width;
}
tabChunkPtr = chunkPtr;
tabSize = SizeOfTab(textPtr, tabStyle, tabArrayPtr, &tabIndex, x,
maxX);
if ((maxX >= 0) && (tabSize >= maxX - x)) {
break;
}
}
curIndex.byteIndex += chunkPtr->numBytes;
byteOffset += chunkPtr->numBytes;
if (byteOffset >= segPtr->size) {
byteOffset = 0;
segPtr = segPtr->nextPtr;
if (elide && segPtr == NULL) {
/*
* An elided section started on this line, and carries on
* until the newline. Hence the newline is actually elided,
* and we want to merge the display of the next logical line
* with this one.
*/
TkTextLine *linePtr = TkBTreeNextLine(NULL, curIndex.linePtr);
if (linePtr != NULL) {
dlPtr->logicalLinesMerged++;
curIndex.byteIndex = 0;
curIndex.linePtr = linePtr;
chunkPtr = NULL;
goto connectNextLogicalLine;
}
}
}
chunkPtr = NULL;
}
#if TK_LAYOUT_WITH_BASE_CHUNKS
FinalizeBaseChunk(NULL);
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
if (noCharsYet) {
dlPtr->spaceAbove = 0;
dlPtr->spaceBelow = 0;
dlPtr->length = 0;
/*
* We used to Tcl_Panic here, saying that LayoutDLine couldn't place
* any characters on a line, but I believe a more appropriate response
* is to return a DLine with zero height. With elided lines, tag
* transitions and asynchronous line height calculations, it is hard
* to avoid this situation ever arising with the current code design.
*/
return dlPtr;
}
wholeLine = (segPtr == NULL);
/*
* We're at the end of the display line. Throw away everything after the
* most recent word break, if there is one; this may potentially require
* the last chunk to be layed out again.
*/
if (breakChunkPtr == NULL) {
/*
* This code makes sure that we don't accidentally display chunks with
* no characters at the end of the line (such as the insertion
* cursor). These chunks belong on the next line. So, throw away
* everything after the last chunk that has characters in it.
*/
breakChunkPtr = lastCharChunkPtr;
breakByteOffset = breakChunkPtr->numBytes;
}
if ((breakChunkPtr != NULL) && ((lastChunkPtr != breakChunkPtr)
|| (breakByteOffset != lastChunkPtr->numBytes))) {
while (1) {
chunkPtr = breakChunkPtr->nextPtr;
if (chunkPtr == NULL) {
break;
}
FreeStyle(textPtr, chunkPtr->stylePtr);
breakChunkPtr->nextPtr = chunkPtr->nextPtr;
if (chunkPtr->undisplayProc != NULL) {
(*chunkPtr->undisplayProc)(textPtr, chunkPtr);
}
ckfree((char *) chunkPtr);
}
if (breakByteOffset != breakChunkPtr->numBytes) {
if (breakChunkPtr->undisplayProc != NULL) {
(*breakChunkPtr->undisplayProc)(textPtr, breakChunkPtr);
}
segPtr = TkTextIndexToSeg(&breakIndex, &byteOffset);
(*segPtr->typePtr->layoutProc)(textPtr, &breakIndex,
segPtr, byteOffset, maxX, breakByteOffset, 0,
wrapMode, breakChunkPtr);
#if TK_LAYOUT_WITH_BASE_CHUNKS
FinalizeBaseChunk(NULL);
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
}
lastChunkPtr = breakChunkPtr;
wholeLine = 0;
}
/*
* Make tab adjustments for the last tab stop, if there is one.
*/
if ((tabIndex >= 0) && (tabChunkPtr != NULL)) {
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
}
/*
* Make one more pass over the line to recompute various things like its
* height, length, and total number of bytes. Also modify the x-locations
* of chunks to reflect justification. If we're not wrapping, I'm not sure
* what is the best way to handle left and center justification: should
* the total length, for purposes of justification, be (a) the window
* width, (b) the length of the longest line in the window, or (c) the
* length of the longest line in the text? (c) isn't available, (b) seems
* weird, since it can change with vertical scrolling, so (a) is what is
* implemented below.
*/
if (wrapMode == TEXT_WRAPMODE_NONE) {
maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x - rMargin;
}
dlPtr->length = lastChunkPtr->x + lastChunkPtr->width;
if (justify == TK_JUSTIFY_LEFT) {
jIndent = 0;
} else if (justify == TK_JUSTIFY_RIGHT) {
jIndent = maxX - dlPtr->length;
} else {
jIndent = (maxX - dlPtr->length)/2;
}
ascent = descent = 0;
for (chunkPtr = dlPtr->chunkPtr; chunkPtr != NULL;
chunkPtr = chunkPtr->nextPtr) {
chunkPtr->x += jIndent;
dlPtr->byteCount += chunkPtr->numBytes;
if (chunkPtr->minAscent > ascent) {
ascent = chunkPtr->minAscent;
}
if (chunkPtr->minDescent > descent) {
descent = chunkPtr->minDescent;
}
if (chunkPtr->minHeight > dlPtr->height) {
dlPtr->height = chunkPtr->minHeight;
}
sValuePtr = chunkPtr->stylePtr->sValuePtr;
if ((sValuePtr->borderWidth > 0)
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
dlPtr->flags |= HAS_3D_BORDER;
}
}
if (dlPtr->height < (ascent + descent)) {
dlPtr->height = ascent + descent;
dlPtr->baseline = ascent;
} else {
dlPtr->baseline = ascent + (dlPtr->height - ascent - descent)/2;
}
sValuePtr = dlPtr->chunkPtr->stylePtr->sValuePtr;
if (dlPtr->index.byteIndex == 0) {
dlPtr->spaceAbove = sValuePtr->spacing1;
} else {
dlPtr->spaceAbove = sValuePtr->spacing2 - sValuePtr->spacing2/2;
}
if (wholeLine) {
dlPtr->spaceBelow = sValuePtr->spacing3;
} else {
dlPtr->spaceBelow = sValuePtr->spacing2/2;
}
dlPtr->height += dlPtr->spaceAbove + dlPtr->spaceBelow;
dlPtr->baseline += dlPtr->spaceAbove;
/*
* Recompute line length: may have changed because of justification.
*/
dlPtr->length = lastChunkPtr->x + lastChunkPtr->width;
return dlPtr;
}
/*
*----------------------------------------------------------------------
*
* UpdateDisplayInfo --
*
* This function is invoked to recompute some or all of the DLine
* structures for a text widget. At the time it is called the DLine
* structures still left in the widget are guaranteed to be correct
* except that (a) the y-coordinates aren't necessarily correct, (b)
* there may be missing structures (the DLine structures get removed as
* soon as they are potentially out-of-date), and (c) DLine structures
* that don't start at the beginning of a line may be incorrect if
* previous information in the same line changed size in a way that moved
* a line boundary (DLines for any info that changed will have been
* deleted, but not DLines for unchanged info in the same text line).
*
* Results:
* None.
*
* Side effects:
* Upon return, the DLine information for textPtr correctly reflects the
* positions where characters will be displayed. However, this function
* doesn't actually bring the display up-to-date.
*
*----------------------------------------------------------------------
*/
static void
UpdateDisplayInfo(
TkText *textPtr) /* Text widget to update. */
{
register TextDInfo *dInfoPtr = textPtr->dInfoPtr;
register DLine *dlPtr, *prevPtr;
TkTextIndex index;
TkTextLine *lastLinePtr;
int y, maxY, xPixelOffset, maxOffset, lineHeight;
if (!(dInfoPtr->flags & DINFO_OUT_OF_DATE)) {
return;
}
dInfoPtr->flags &= ~DINFO_OUT_OF_DATE;
/*
* Delete any DLines that are now above the top of the window.
*/
index = textPtr->topIndex;
dlPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, &index);
if ((dlPtr != NULL) && (dlPtr != dInfoPtr->dLinePtr)) {
FreeDLines(textPtr, dInfoPtr->dLinePtr, dlPtr, DLINE_UNLINK);
}
if (index.byteIndex == 0) {
lineHeight = 0;
} else {
lineHeight = -1;
}
/*
* Scan through the contents of the window from top to bottom, recomputing
* information for lines that are missing.
*/
lastLinePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree, textPtr,
TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr));
dlPtr = dInfoPtr->dLinePtr;
prevPtr = NULL;
y = dInfoPtr->y - dInfoPtr->newTopPixelOffset;
maxY = dInfoPtr->maxY;
while (1) {
register DLine *newPtr;
if (index.linePtr == lastLinePtr) {
break;
}
/*
* There are three possibilities right now:
* (a) the next DLine (dlPtr) corresponds exactly to the next
* information we want to display: just use it as-is.
* (b) the next DLine corresponds to a different line, or to a segment
* that will be coming later in the same line: leave this DLine
* alone in the hopes that we'll be able to use it later, then
* create a new DLine in front of it.
* (c) the next DLine corresponds to a segment in the line we want,
* but it's a segment that has already been processed or will
* never be processed. Delete the DLine and try again.
*
* One other twist on all this. It's possible for 3D borders to
* interact between lines (see DisplayLineBackground) so if a line is
* relayed out and has styles with 3D borders, its neighbors have to
* be redrawn if they have 3D borders too, since the interactions
* could have changed (the neighbors don't have to be relayed out,
* just redrawn).
*/
if ((dlPtr == NULL) || (dlPtr->index.linePtr != index.linePtr)) {
/*
* Case (b) -- must make new DLine.
*/
makeNewDLine:
if (tkTextDebug) {
char string[TK_POS_CHARS];
/*
* Debugging is enabled, so keep a log of all the lines that
* were re-layed out. The test suite uses this information.
*/
TkTextPrintIndex(textPtr, &index, string);
LOG("tk_textRelayout", string);
}
newPtr = LayoutDLine(textPtr, &index);
if (prevPtr == NULL) {
dInfoPtr->dLinePtr = newPtr;
} else {
prevPtr->nextPtr = newPtr;
if (prevPtr->flags & HAS_3D_BORDER) {
prevPtr->flags |= OLD_Y_INVALID;
}
}
newPtr->nextPtr = dlPtr;
dlPtr = newPtr;
} else {
/*
* DlPtr refers to the line we want. Next check the index within
* the line.
*/
if (index.byteIndex == dlPtr->index.byteIndex) {
/*
* Case (a) - can use existing display line as-is.
*/
if ((dlPtr->flags & HAS_3D_BORDER) && (prevPtr != NULL)
&& (prevPtr->flags & (NEW_LAYOUT))) {
dlPtr->flags |= OLD_Y_INVALID;
}
goto lineOK;
}
if (index.byteIndex < dlPtr->index.byteIndex) {
goto makeNewDLine;
}
/*
* Case (c) - dlPtr is useless. Discard it and start again with
* the next display line.
*/
newPtr = dlPtr->nextPtr;
FreeDLines(textPtr, dlPtr, newPtr, DLINE_FREE);
dlPtr = newPtr;
if (prevPtr != NULL) {
prevPtr->nextPtr = newPtr;
} else {
dInfoPtr->dLinePtr = newPtr;
}
continue;
}
/*
* Advance to the start of the next line.
*/
lineOK:
dlPtr->y = y;
y += dlPtr->height;
if (lineHeight != -1) {
lineHeight += dlPtr->height;
}
TkTextIndexForwBytes(textPtr, &index, dlPtr->byteCount, &index);
prevPtr = dlPtr;
dlPtr = dlPtr->nextPtr;
/*
* If we switched text lines, delete any DLines left for the old text
* line.
*/
if (index.linePtr != prevPtr->index.linePtr) {
register DLine *nextPtr;
nextPtr = dlPtr;
while ((nextPtr != NULL)
&& (nextPtr->index.linePtr == prevPtr->index.linePtr)) {
nextPtr = nextPtr->nextPtr;
}
if (nextPtr != dlPtr) {
FreeDLines(textPtr, dlPtr, nextPtr, DLINE_FREE);
prevPtr->nextPtr = nextPtr;
dlPtr = nextPtr;
}
if ((lineHeight != -1) && (TkBTreeLinePixelCount(textPtr,
prevPtr->index.linePtr) != lineHeight)) {
/*
* The logical line height we just calculated is actually
* different to the currently cached height of the text line.
* That is fine (the text line heights are only calculated
* asynchronously), but we must update the cached height so
* that any counts made with DLine pointers are the same as
* counts made through the BTree. This helps to ensure that
* the scrollbar size corresponds accurately to that displayed
* contents, even as the window is re-sized.
*/
TkBTreeAdjustPixelHeight(textPtr, prevPtr->index.linePtr,
lineHeight, 0);
/*
* I believe we can be 100% sure that we started at the
* beginning of the logical line, so we can also adjust the
* 'pixelCalculationEpoch' to mark it as being up to date.
* There is a slight concern that we might not have got this
* right for the first line in the re-display.
*/
TkBTreeLinePixelEpoch(textPtr, prevPtr->index.linePtr) =
dInfoPtr->lineMetricUpdateEpoch;
}
lineHeight = 0;
}
/*
* It's important to have the following check here rather than in the
* while statement for the loop, so that there's always at least one
* DLine generated, regardless of how small the window is. This keeps
* a lot of other code from breaking.
*/
if (y >= maxY) {
break;
}
}
/*
* Delete any DLine structures that don't fit on the screen.
*/
FreeDLines(textPtr, dlPtr, NULL, DLINE_UNLINK);
/*
* If there is extra space at the bottom of the window (because we've hit
* the end of the text), then bring in more lines at the top of the
* window, if there are any, to fill in the view.
*
* Since the top line may only be partially visible, we try first to
* simply show more pixels from that line (newTopPixelOffset). If that
* isn't enough, we have to layout more lines.
*/
if (y < maxY) {
/*
* This counts how many vertical pixels we have left to fill by
* pulling in more display pixels either from the first currently
* displayed, or the lines above it.
*/
int spaceLeft = maxY - y;
if (spaceLeft <= dInfoPtr->newTopPixelOffset) {
/*
* We can fill up all the needed space just by showing more of the
* current top line.
*/
dInfoPtr->newTopPixelOffset -= spaceLeft;
y += spaceLeft;
spaceLeft = 0;
} else {
int lineNum, bytesToCount;
DLine *lowestPtr;
/*
* Add in all of the current top line, which won't be enough to
* bring y up to maxY (if it was we would be in the 'if' block
* above).
*/
y += dInfoPtr->newTopPixelOffset;
dInfoPtr->newTopPixelOffset = 0;
/*
* Layout an entire text line (potentially > 1 display line), then
* link in as many display lines as fit without moving the bottom
* line out of the window. Repeat this until all the extra space
* has been used up or we've reached the beginning of the text.
*/
spaceLeft = maxY - y;
if (dInfoPtr->dLinePtr == NULL) {
/*
* No lines have been laid out. This must be an empty peer
* widget.
*/
lineNum = TkBTreeNumLines(textPtr->sharedTextPtr->tree,
textPtr) - 1;
bytesToCount = INT_MAX;
} else {
lineNum = TkBTreeLinesTo(textPtr,
dInfoPtr->dLinePtr->index.linePtr);
bytesToCount = dInfoPtr->dLinePtr->index.byteIndex;
if (bytesToCount == 0) {
bytesToCount = INT_MAX;
lineNum--;
}
}
for ( ; (lineNum >= 0) && (spaceLeft > 0); lineNum--) {
int pixelHeight = 0;
index.linePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree,
textPtr, lineNum);
index.byteIndex = 0;
lowestPtr = NULL;
do {
dlPtr = LayoutDLine(textPtr, &index);
pixelHeight += dlPtr->height;
dlPtr->nextPtr = lowestPtr;
lowestPtr = dlPtr;
if (dlPtr->length == 0 && dlPtr->height == 0) {
bytesToCount--;
break;
} /* elide */
TkTextIndexForwBytes(textPtr, &index, dlPtr->byteCount,
&index);
bytesToCount -= dlPtr->byteCount;
} while ((bytesToCount > 0)
&& (index.linePtr == lowestPtr->index.linePtr));
/*
* We may not have examined the entire line (depending on the
* value of 'bytesToCount', so we only want to set this if it
* is genuinely bigger).
*/
if (pixelHeight > TkBTreeLinePixelCount(textPtr,
lowestPtr->index.linePtr)) {
TkBTreeAdjustPixelHeight(textPtr,
lowestPtr->index.linePtr, pixelHeight, 0);
if (index.linePtr != lowestPtr->index.linePtr) {
/*
* We examined the entire line, so can update the
* epoch.
*/
TkBTreeLinePixelEpoch(textPtr,
lowestPtr->index.linePtr) =
dInfoPtr->lineMetricUpdateEpoch;
}
}
/*
* Scan through the display lines from the bottom one up to
* the top one.
*/
while (lowestPtr != NULL) {
dlPtr = lowestPtr;
spaceLeft -= dlPtr->height;
lowestPtr = dlPtr->nextPtr;
dlPtr->nextPtr = dInfoPtr->dLinePtr;
dInfoPtr->dLinePtr = dlPtr;
if (tkTextDebug) {
char string[TK_POS_CHARS];
TkTextPrintIndex(textPtr, &dlPtr->index, string);
LOG("tk_textRelayout", string);
}
if (spaceLeft <= 0) {
break;
}
}
FreeDLines(textPtr, lowestPtr, NULL, DLINE_FREE);
bytesToCount = INT_MAX;
}
/*
* We've either filled in the space we wanted to or we've run out
* of display lines at the top of the text. Note that we already
* set dInfoPtr->newTopPixelOffset to zero above.
*/
if (spaceLeft < 0) {
/*
* We've laid out a few too many vertical pixels at or above
* the first line. Therefore we only want to show part of the
* first displayed line, so that the last displayed line just
* fits in the window.
*/
dInfoPtr->newTopPixelOffset = -spaceLeft;
if (dInfoPtr->newTopPixelOffset>=dInfoPtr->dLinePtr->height) {
/*
* Somehow the entire first line we laid out is shorter
* than the new offset. This should not occur and would
* indicate a bad problem in the logic above.
*/
Tcl_Panic("Error in pixel height consistency while filling in spacesLeft");
}
}
}
/*
* Now we're all done except that the y-coordinates in all the DLines
* are wrong and the top index for the text is wrong. Update them.
*/
if (dInfoPtr->dLinePtr != NULL) {
textPtr->topIndex = dInfoPtr->dLinePtr->index;
y = dInfoPtr->y - dInfoPtr->newTopPixelOffset;
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
dlPtr = dlPtr->nextPtr) {
if (y > dInfoPtr->maxY) {
Tcl_Panic("Added too many new lines in UpdateDisplayInfo");
}
dlPtr->y = y;
y += dlPtr->height;
}
}
}
/*
* If the old top or bottom line has scrolled elsewhere on the screen, we
* may not be able to re-use its old contents by copying bits (e.g., a
* beveled edge that was drawn when it was at the top or bottom won't be
* drawn when the line is in the middle and its neighbor has a matching
* background). Similarly, if the new top or bottom line came from
* somewhere else on the screen, we may not be able to copy the old bits.
*/
dlPtr = dInfoPtr->dLinePtr;
if (dlPtr != NULL) {
if ((dlPtr->flags & HAS_3D_BORDER) && !(dlPtr->flags & TOP_LINE)) {
dlPtr->flags |= OLD_Y_INVALID;
}
while (1) {
if ((dlPtr->flags & TOP_LINE) && (dlPtr != dInfoPtr->dLinePtr)
&& (dlPtr->flags & HAS_3D_BORDER)) {
dlPtr->flags |= OLD_Y_INVALID;
}
/*
* If the old top-line was not completely showing (i.e. the
* pixelOffset is non-zero) and is no longer the top-line, then we
* must re-draw it.
*/
if ((dlPtr->flags & TOP_LINE) &&
dInfoPtr->topPixelOffset!=0 && dlPtr!=dInfoPtr->dLinePtr) {
dlPtr->flags |= OLD_Y_INVALID;
}
if ((dlPtr->flags & BOTTOM_LINE) && (dlPtr->nextPtr != NULL)
&& (dlPtr->flags & HAS_3D_BORDER)) {
dlPtr->flags |= OLD_Y_INVALID;
}
if (dlPtr->nextPtr == NULL) {
if ((dlPtr->flags & HAS_3D_BORDER)
&& !(dlPtr->flags & BOTTOM_LINE)) {
dlPtr->flags |= OLD_Y_INVALID;
}
dlPtr->flags &= ~TOP_LINE;
dlPtr->flags |= BOTTOM_LINE;
break;
}
dlPtr->flags &= ~(TOP_LINE|BOTTOM_LINE);
dlPtr = dlPtr->nextPtr;
}
dInfoPtr->dLinePtr->flags |= TOP_LINE;
dInfoPtr->topPixelOffset = dInfoPtr->newTopPixelOffset;
}
/*
* Arrange for scrollbars to be updated.
*/
textPtr->flags |= UPDATE_SCROLLBARS;
/*
* Deal with horizontal scrolling:
* 1. If there's empty space to the right of the longest line, shift the
* screen to the right to fill in the empty space.
* 2. If the desired horizontal scroll position has changed, force a full
* redisplay of all the lines in the widget.
* 3. If the wrap mode isn't "none" then re-scroll to the base position.
*/
dInfoPtr->maxLength = 0;
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
dlPtr = dlPtr->nextPtr) {
if (dlPtr->length > dInfoPtr->maxLength) {
dInfoPtr->maxLength = dlPtr->length;
}
}
maxOffset = dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x);
xPixelOffset = dInfoPtr->newXPixelOffset;
if (xPixelOffset > maxOffset) {
xPixelOffset = maxOffset;
}
if (xPixelOffset < 0) {
xPixelOffset = 0;
}
/*
* Here's a problem: see the tests textDisp-29.2.1-4
*
* If the widget is being created, but has not yet been configured it will
* have a maxY of 1 above, and we we won't have examined all the lines
* (just the first line, in fact), and so maxOffset will not be a true
* reflection of the widget's lines. Therefore we must not overwrite the
* original newXPixelOffset in this case.
*/
if (!(((Tk_FakeWin *) (textPtr->tkwin))->flags & TK_NEED_CONFIG_NOTIFY)) {
dInfoPtr->newXPixelOffset = xPixelOffset;
}
if (xPixelOffset != dInfoPtr->curXPixelOffset) {
dInfoPtr->curXPixelOffset = xPixelOffset;
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
dlPtr = dlPtr->nextPtr) {
dlPtr->flags |= OLD_Y_INVALID;
}
}
}
/*
*----------------------------------------------------------------------
*
* FreeDLines --
*
* This function is called to free up all of the resources associated
* with one or more DLine structures.
*
* Results:
* None.
*
* Side effects:
* Memory gets freed and various other resources are released.
*
*----------------------------------------------------------------------
*/
static void
FreeDLines(
TkText *textPtr, /* Information about overall text widget. */
register DLine *firstPtr, /* Pointer to first DLine to free up. */
DLine *lastPtr, /* Pointer to DLine just after last one to
* free (NULL means everything starting with
* firstPtr). */
int action) /* DLINE_UNLINK means DLines are currently
* linked into the list rooted at
* textPtr->dInfoPtr->dLinePtr and they have
* to be unlinked. DLINE_FREE means just free
* without unlinking. DLINE_FREE_TEMP means
* the DLine given is just a temporary one and
* we shouldn't invalidate anything for the
* overall widget. */
{
register TkTextDispChunk *chunkPtr, *nextChunkPtr;
register DLine *nextDLinePtr;
if (action == DLINE_FREE_TEMP) {
lineHeightsRecalculated++;
if (tkTextDebug) {
char string[TK_POS_CHARS];
/*
* Debugging is enabled, so keep a log of all the lines whose
* height was recalculated. The test suite uses this information.
*/
TkTextPrintIndex(textPtr, &firstPtr->index, string);
LOG("tk_textHeightCalc", string);
}
} else if (action == DLINE_UNLINK) {
if (textPtr->dInfoPtr->dLinePtr == firstPtr) {
textPtr->dInfoPtr->dLinePtr = lastPtr;
} else {
register DLine *prevPtr;
for (prevPtr = textPtr->dInfoPtr->dLinePtr;
prevPtr->nextPtr != firstPtr; prevPtr = prevPtr->nextPtr) {
/* Empty loop body. */
}
prevPtr->nextPtr = lastPtr;
}
}
while (firstPtr != lastPtr) {
nextDLinePtr = firstPtr->nextPtr;
for (chunkPtr = firstPtr->chunkPtr; chunkPtr != NULL;
chunkPtr = nextChunkPtr) {
if (chunkPtr->undisplayProc != NULL) {
(*chunkPtr->undisplayProc)(textPtr, chunkPtr);
}
FreeStyle(textPtr, chunkPtr->stylePtr);
nextChunkPtr = chunkPtr->nextPtr;
ckfree((char *) chunkPtr);
}
ckfree((char *) firstPtr);
firstPtr = nextDLinePtr;
}
if (action != DLINE_FREE_TEMP) {
textPtr->dInfoPtr->dLinesInvalidated = 1;
}
}
/*
*----------------------------------------------------------------------
*
* DisplayDLine --
*
* This function is invoked to draw a single line on the screen.
*
* Results:
* None.
*
* Side effects:
* The line given by dlPtr is drawn at its correct position in textPtr's
* window. Note that this is one *display* line, not one *text* line.
*
*----------------------------------------------------------------------
*/
static void
DisplayDLine(
TkText *textPtr, /* Text widget in which to draw line. */
register DLine *dlPtr, /* Information about line to draw. */
DLine *prevPtr, /* Line just before one to draw, or NULL if
* dlPtr is the top line. */
Pixmap pixmap) /* Pixmap to use for double-buffering. Caller
* must make sure it's large enough to hold
* line. */
{
register TkTextDispChunk *chunkPtr;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
Display *display;
int height, y_off;
#ifndef TK_NO_DOUBLE_BUFFERING
const int y = 0;
#else
const int y = dlPtr->y;
#endif /* TK_NO_DOUBLE_BUFFERING */
if (dlPtr->chunkPtr == NULL) return;
display = Tk_Display(textPtr->tkwin);
height = dlPtr->height;
if ((height + dlPtr->y) > dInfoPtr->maxY) {
height = dInfoPtr->maxY - dlPtr->y;
}
if (dlPtr->y < dInfoPtr->y) {
y_off = dInfoPtr->y - dlPtr->y;
height -= y_off;
} else {
y_off = 0;
}
#ifdef TK_NO_DOUBLE_BUFFERING
TkpClipDrawableToRect(display, pixmap, dInfoPtr->x, y + y_off,
dInfoPtr->maxX - dInfoPtr->x, height);
#endif /* TK_NO_DOUBLE_BUFFERING */
/*
* First, clear the area of the line to the background color for the text
* widget.
*/
Tk_Fill3DRectangle(textPtr->tkwin, pixmap, textPtr->border, 0, y,
Tk_Width(textPtr->tkwin), dlPtr->height, 0, TK_RELIEF_FLAT);
/*
* Next, draw background information for the whole line.
*/
DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap);
/*
* Make another pass through all of the chunks to redraw the insertion
* cursor, if it is visible on this line. Must do it here rather than in
* the foreground pass below because otherwise a wide insertion cursor
* will obscure the character to its left.
*/
if (textPtr->state == TK_TEXT_STATE_NORMAL) {
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
chunkPtr = chunkPtr->nextPtr) {
if (chunkPtr->displayProc == TkTextInsertDisplayProc) {
int x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curXPixelOffset;
(*chunkPtr->displayProc)(textPtr, chunkPtr, x,
y + dlPtr->spaceAbove,
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
dlPtr->y + dlPtr->spaceAbove);
}
}
}
/*
* Make yet another pass through all of the chunks to redraw all of
* foreground information. Note: we have to call the displayProc even for
* chunks that are off-screen. This is needed, for example, so that
* embedded windows can be unmapped in this case.
*/
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
chunkPtr = chunkPtr->nextPtr) {
if (chunkPtr->displayProc == TkTextInsertDisplayProc) {
/*
* Already displayed the insertion cursor above. Don't do it again
* here.
*/
continue;
}
/*
* Don't call if elide. This tax OK since not very many visible DLines
* in an area, but potentially many elide ones.
*/
if (chunkPtr->displayProc != NULL) {
int x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curXPixelOffset;
if ((x + chunkPtr->width <= 0) || (x >= dInfoPtr->maxX)) {
/*
* Note: we have to call the displayProc even for chunks that
* are off-screen. This is needed, for example, so that
* embedded windows can be unmapped in this case. Display the
* chunk at a coordinate that can be clearly identified by the
* displayProc as being off-screen to the left (the
* displayProc may not be able to tell if something is off to
* the right).
*/
x = -chunkPtr->width;
}
(*chunkPtr->displayProc)(textPtr, chunkPtr, x,
y + dlPtr->spaceAbove, dlPtr->height - dlPtr->spaceAbove -
dlPtr->spaceBelow, dlPtr->baseline - dlPtr->spaceAbove,
display, pixmap, dlPtr->y + dlPtr->spaceAbove);
}
if (dInfoPtr->dLinesInvalidated) {
return;
}
}
#ifndef TK_NO_DOUBLE_BUFFERING
/*
* Copy the pixmap onto the screen. If this is the first or last line on
* the screen then copy a piece of the line, so that it doesn't overflow
* into the border area. Another special trick: copy the padding area to
* the left of the line; this is because the insertion cursor sometimes
* overflows onto that area and we want to get as much of the cursor as
* possible.
*/
XCopyArea(display, pixmap, Tk_WindowId(textPtr->tkwin), dInfoPtr->copyGC,
dInfoPtr->x, y + y_off, (unsigned) (dInfoPtr->maxX - dInfoPtr->x),
(unsigned) height, dInfoPtr->x, dlPtr->y + y_off);
#else
TkpClipDrawableToRect(display, pixmap, 0, 0, -1, -1);
#endif /* TK_NO_DOUBLE_BUFFERING */
linesRedrawn++;
}
/*
*--------------------------------------------------------------
*
* DisplayLineBackground --
*
* This function is called to fill in the background for a display line.
* It draws 3D borders cleverly so that adjacent chunks with the same
* style (whether on the same line or different lines) have a single 3D
* border around the whole region.
*
* Results:
* There is no return value. Pixmap is filled in with background
* information for dlPtr.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
DisplayLineBackground(
TkText *textPtr, /* Text widget containing line. */
register DLine *dlPtr, /* Information about line to draw. */
DLine *prevPtr, /* Line just above dlPtr, or NULL if dlPtr is
* the top-most line in the window. */
Pixmap pixmap) /* Pixmap to use for double-buffering. Caller
* must make sure it's large enough to hold
* line. Caller must also have filled it with
* the background color for the widget. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
TkTextDispChunk *chunkPtr; /* Pointer to chunk in the current line. */
TkTextDispChunk *chunkPtr2; /* Pointer to chunk in the line above or below
* the current one. NULL if we're to the left
* of or to the right of the chunks in the
* line. */
TkTextDispChunk *nextPtr2; /* Next chunk after chunkPtr2 (it's not the
* same as chunkPtr2->nextPtr in the case
* where chunkPtr2 is NULL because the line is
* indented). */
int leftX; /* The left edge of the region we're currently
* working on. */
int leftXIn; /* 1 means beveled edge at leftX slopes right
* as it goes down, 0 means it slopes left as
* it goes down. */
int rightX; /* Right edge of chunkPtr. */
int rightX2; /* Right edge of chunkPtr2. */
int matchLeft; /* Does the style of this line match that of
* its neighbor just to the left of the
* current x coordinate? */
int matchRight; /* Does line's style match its neighbor just
* to the right of the current x-coord? */
int minX, maxX, xOffset;
StyleValues *sValuePtr;
Display *display;
#ifndef TK_NO_DOUBLE_BUFFERING
const int y = 0;
#else
const int y = dlPtr->y;
#endif /* TK_NO_DOUBLE_BUFFERING */
/*
* Pass 1: scan through dlPtr from left to right. For each range of chunks
* with the same style, draw the main background for the style plus the
* vertical parts of the 3D borders (the left and right edges).
*/
display = Tk_Display(textPtr->tkwin);
minX = dInfoPtr->curXPixelOffset;
xOffset = dInfoPtr->x - minX;
maxX = minX + dInfoPtr->maxX - dInfoPtr->x;
chunkPtr = dlPtr->chunkPtr;
/*
* Note A: in the following statement, and a few others later in this file
* marked with "See Note A above", the right side of the assignment was
* replaced with 0 on 6/18/97. This has the effect of highlighting the
* empty space to the left of a line whenever the leftmost character of
* the line is highlighted. This way, multi-line highlights always line up
* along their left edges. However, this may look funny in the case where
* a single word is highlighted. To undo the change, replace "leftX = 0"
* with "leftX = chunkPtr->x" and "rightX2 = 0" with "rightX2 =
* nextPtr2->x" here and at all the marked points below. This restores the
* old behavior where empty space to the left of a line is not
* highlighted, leaving a ragged left edge for multi-line highlights.
*/
leftX = 0;
for (; leftX < maxX; chunkPtr = chunkPtr->nextPtr) {
if ((chunkPtr->nextPtr != NULL)
&& SAME_BACKGROUND(chunkPtr->nextPtr->stylePtr,
chunkPtr->stylePtr)) {
continue;
}
sValuePtr = chunkPtr->stylePtr->sValuePtr;
rightX = chunkPtr->x + chunkPtr->width;
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
rightX = maxX;
}
if (chunkPtr->stylePtr->bgGC != None) {
/*
* Not visible - bail out now.
*/
if (rightX + xOffset <= 0) {
leftX = rightX;
continue;
}
/*
* Trim the start position for drawing to be no further away than
* -borderWidth. The reason is that on many X servers drawing from
* -32768 (or less) to +something simply does not display
* correctly. [Patch #541999]
*/
if ((leftX + xOffset) < -(sValuePtr->borderWidth)) {
leftX = -sValuePtr->borderWidth - xOffset;
}
if ((rightX - leftX) > 32767) {
rightX = leftX + 32767;
}
XFillRectangle(display, pixmap, chunkPtr->stylePtr->bgGC,
leftX + xOffset, y, (unsigned int) (rightX - leftX),
(unsigned int) dlPtr->height);
if (sValuePtr->relief != TK_RELIEF_FLAT) {
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
leftX + xOffset, y, sValuePtr->borderWidth,
dlPtr->height, 1, sValuePtr->relief);
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
rightX - sValuePtr->borderWidth + xOffset,
y, sValuePtr->borderWidth, dlPtr->height, 0,
sValuePtr->relief);
}
}
leftX = rightX;
}
/*
* Pass 2: draw the horizontal bevels along the top of the line. To do
* this, scan through dlPtr from left to right while simultaneously
* scanning through the line just above dlPtr. ChunkPtr2 and nextPtr2
* refer to two adjacent chunks in the line above.
*/
chunkPtr = dlPtr->chunkPtr;
leftX = 0; /* See Note A above. */
leftXIn = 1;
rightX = chunkPtr->x + chunkPtr->width;
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
rightX = maxX;
}
chunkPtr2 = NULL;
if (prevPtr != NULL && prevPtr->chunkPtr != NULL) {
/*
* Find the chunk in the previous line that covers leftX.
*/
nextPtr2 = prevPtr->chunkPtr;
rightX2 = 0; /* See Note A above. */
while (rightX2 <= leftX) {
chunkPtr2 = nextPtr2;
if (chunkPtr2 == NULL) {
break;
}
nextPtr2 = chunkPtr2->nextPtr;
rightX2 = chunkPtr2->x + chunkPtr2->width;
if (nextPtr2 == NULL) {
rightX2 = INT_MAX;
}
}
} else {
nextPtr2 = NULL;
rightX2 = INT_MAX;
}
while (leftX < maxX) {
matchLeft = (chunkPtr2 != NULL)
&& SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr);
sValuePtr = chunkPtr->stylePtr->sValuePtr;
if (rightX <= rightX2) {
/*
* The chunk in our line is about to end. If its style changes
* then draw the bevel for the current style.
*/
if ((chunkPtr->nextPtr == NULL)
|| !SAME_BACKGROUND(chunkPtr->stylePtr,
chunkPtr->nextPtr->stylePtr)) {
if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) {
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap,
sValuePtr->border, leftX + xOffset, y,
rightX - leftX, sValuePtr->borderWidth, leftXIn,
1, 1, sValuePtr->relief);
}
leftX = rightX;
leftXIn = 1;
/*
* If the chunk in the line above is also ending at the same
* point then advance to the next chunk in that line.
*/
if ((rightX == rightX2) && (chunkPtr2 != NULL)) {
goto nextChunk2;
}
}
chunkPtr = chunkPtr->nextPtr;
if (chunkPtr == NULL) {
break;
}
rightX = chunkPtr->x + chunkPtr->width;
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
rightX = maxX;
}
continue;
}
/*
* The chunk in the line above is ending at an x-position where there
* is no change in the style of the current line. If the style above
* matches the current line on one side of the change but not on the
* other, we have to draw an L-shaped piece of bevel.
*/
matchRight = (nextPtr2 != NULL)
&& SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr);
if (matchLeft && !matchRight) {
if (sValuePtr->relief != TK_RELIEF_FLAT) {
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
rightX2 - sValuePtr->borderWidth + xOffset, y,
sValuePtr->borderWidth, sValuePtr->borderWidth, 0,
sValuePtr->relief);
}
leftX = rightX2 - sValuePtr->borderWidth;
leftXIn = 0;
} else if (!matchLeft && matchRight
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
rightX2 + xOffset, y, sValuePtr->borderWidth,
sValuePtr->borderWidth, 1, sValuePtr->relief);
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
leftX + xOffset, y, rightX2 + sValuePtr->borderWidth -
leftX, sValuePtr->borderWidth, leftXIn, 0, 1,
sValuePtr->relief);
}
nextChunk2:
chunkPtr2 = nextPtr2;
if (chunkPtr2 == NULL) {
rightX2 = INT_MAX;
} else {
nextPtr2 = chunkPtr2->nextPtr;
rightX2 = chunkPtr2->x + chunkPtr2->width;
if (nextPtr2 == NULL) {
rightX2 = INT_MAX;
}
}
}
/*
* Pass 3: draw the horizontal bevels along the bottom of the line. This
* uses the same approach as pass 2.
*/
chunkPtr = dlPtr->chunkPtr;
leftX = 0; /* See Note A above. */
leftXIn = 0;
rightX = chunkPtr->x + chunkPtr->width;
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
rightX = maxX;
}
chunkPtr2 = NULL;
if (dlPtr->nextPtr != NULL && dlPtr->nextPtr->chunkPtr != NULL) {
/*
* Find the chunk in the previous line that covers leftX.
*/
nextPtr2 = dlPtr->nextPtr->chunkPtr;
rightX2 = 0; /* See Note A above. */
while (rightX2 <= leftX) {
chunkPtr2 = nextPtr2;
if (chunkPtr2 == NULL) {
break;
}
nextPtr2 = chunkPtr2->nextPtr;
rightX2 = chunkPtr2->x + chunkPtr2->width;
if (nextPtr2 == NULL) {
rightX2 = INT_MAX;
}
}
} else {
nextPtr2 = NULL;
rightX2 = INT_MAX;
}
while (leftX < maxX) {
matchLeft = (chunkPtr2 != NULL)
&& SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr);
sValuePtr = chunkPtr->stylePtr->sValuePtr;
if (rightX <= rightX2) {
if ((chunkPtr->nextPtr == NULL)
|| !SAME_BACKGROUND(chunkPtr->stylePtr,
chunkPtr->nextPtr->stylePtr)) {
if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) {
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap,
sValuePtr->border, leftX + xOffset,
y + dlPtr->height - sValuePtr->borderWidth,
rightX - leftX, sValuePtr->borderWidth, leftXIn,
0, 0, sValuePtr->relief);
}
leftX = rightX;
leftXIn = 0;
if ((rightX == rightX2) && (chunkPtr2 != NULL)) {
goto nextChunk2b;
}
}
chunkPtr = chunkPtr->nextPtr;
if (chunkPtr == NULL) {
break;
}
rightX = chunkPtr->x + chunkPtr->width;
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
rightX = maxX;
}
continue;
}
matchRight = (nextPtr2 != NULL)
&& SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr);
if (matchLeft && !matchRight) {
if (sValuePtr->relief != TK_RELIEF_FLAT) {
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
rightX2 - sValuePtr->borderWidth + xOffset,
y + dlPtr->height - sValuePtr->borderWidth,
sValuePtr->borderWidth, sValuePtr->borderWidth, 0,
sValuePtr->relief);
}
leftX = rightX2 - sValuePtr->borderWidth;
leftXIn = 1;
} else if (!matchLeft && matchRight
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
rightX2 + xOffset, y + dlPtr->height -
sValuePtr->borderWidth, sValuePtr->borderWidth,
sValuePtr->borderWidth, 1, sValuePtr->relief);
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
leftX + xOffset, y + dlPtr->height -
sValuePtr->borderWidth, rightX2 + sValuePtr->borderWidth -
leftX, sValuePtr->borderWidth, leftXIn, 1, 0,
sValuePtr->relief);
}
nextChunk2b:
chunkPtr2 = nextPtr2;
if (chunkPtr2 == NULL) {
rightX2 = INT_MAX;
} else {
nextPtr2 = chunkPtr2->nextPtr;
rightX2 = chunkPtr2->x + chunkPtr2->width;
if (nextPtr2 == NULL) {
rightX2 = INT_MAX;
}
}
}
}
/*
*----------------------------------------------------------------------
*
* AsyncUpdateLineMetrics --
*
* This function is invoked as a background handler to update the pixel-
* height calculations of individual lines in an asychronous manner.
*
* Currently a timer-handler is used for this purpose, which continuously
* reschedules itself. It may well be better to use some other approach
* (e.g., a background thread). We can't use an idle-callback because of
* a known bug in Tcl/Tk in which idle callbacks are not allowed to
* re-schedule themselves. This just causes an effective infinite loop.
*
* Results:
* None.
*
* Side effects:
* Line heights may be recalculated.
*
*----------------------------------------------------------------------
*/
static void
AsyncUpdateLineMetrics(
ClientData clientData) /* Information about widget. */
{
register TkText *textPtr = (TkText *) clientData;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
int lineNum;
dInfoPtr->lineUpdateTimer = NULL;
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
/*
* The widget has been deleted. Don't do anything.
*/
if (--textPtr->refCount == 0) {
ckfree((char *) textPtr);
}
return;
}
if (dInfoPtr->flags & REDRAW_PENDING) {
dInfoPtr->lineUpdateTimer = Tcl_CreateTimerHandler(1,
AsyncUpdateLineMetrics, clientData);
return;
}
lineNum = dInfoPtr->currentMetricUpdateLine;
if (dInfoPtr->lastMetricUpdateLine == -1) {
dInfoPtr->lastMetricUpdateLine =
TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr);
}
/*
* Update the lines in blocks of about 24 recalculations, or 250+ lines
* examined, so we pass in 256 for 'doThisMuch'.
*/
lineNum = TkTextUpdateLineMetrics(textPtr, lineNum,
dInfoPtr->lastMetricUpdateLine, 256);
if (tkTextDebug) {
char buffer[2 * TCL_INTEGER_SPACE + 1];
sprintf(buffer, "%d %d", lineNum, dInfoPtr->lastMetricUpdateLine);
LOG("tk_textInvalidateLine", buffer);
}
/*
* If we're not in the middle of a long-line calculation (metricEpoch==-1)
* and we've reached the last line, then we're done.
*/
if (dInfoPtr->metricEpoch == -1
&& lineNum == dInfoPtr->lastMetricUpdateLine) {
/*
* We have looped over all lines, so we're done. We must release our
* refCount on the widget (the timer token was already set to NULL
* above).
*/
textPtr->refCount--;
if (textPtr->refCount == 0) {
ckfree((char *) textPtr);
}
return;
}
dInfoPtr->currentMetricUpdateLine = lineNum;
/*
* Re-arm the timer. We already have a refCount on the text widget so no
* need to adjust that.
*/
dInfoPtr->lineUpdateTimer = Tcl_CreateTimerHandler(1,
AsyncUpdateLineMetrics, (ClientData) textPtr);
}
/*
*----------------------------------------------------------------------
*
* TkTextUpdateLineMetrics --
*
* This function updates the pixel height calculations of a range of
* lines in the widget. The range is from lineNum to endLine, but, if
* doThisMuch is positive, then the function may return earlier, once a
* certain number of lines has been examined. The line counts are from 0.
*
* If doThisMuch is -1, then all lines in the range will be updated. This
* will potentially take quite some time for a large text widget.
*
* Note: with bad input for lineNum and endLine, this function can loop
* indefinitely.
*
* Results:
* The index of the last line examined (or -1 if we are about to wrap
* around from end to beginning of the widget, and the next line will be
* the first line).
*
* Side effects:
* Line heights may be recalculated.
*
*----------------------------------------------------------------------
*/
int
TkTextUpdateLineMetrics(
TkText *textPtr, /* Information about widget. */
int lineNum, /* Start at this line. */
int endLine, /* Go no further than this line. */
int doThisMuch) /* How many lines to check, or how many 10s of
* lines to recalculate. If '-1' then do
* everything in the range (which may take a
* while). */
{
TkTextLine *linePtr = NULL;
int count = 0;
int totalLines = TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr);
if (totalLines == 0) {
/*
* Empty peer widget.
*/
return endLine;
}
while (1) {
/*
* Get a suitable line.
*/
if (lineNum == -1 && linePtr == NULL) {
lineNum = 0;
linePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree, textPtr,
lineNum);
} else {
if (lineNum == -1 || linePtr == NULL) {
if (lineNum == -1) {
lineNum = 0;
}
linePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree,
textPtr, lineNum);
} else {
lineNum++;
linePtr = TkBTreeNextLine(textPtr, linePtr);
}
/*
* If we're in the middle of a partial-line height calculation,
* then we can't be done.
*/
if (textPtr->dInfoPtr->metricEpoch == -1 && lineNum == endLine) {
/*
* We have looped over all lines, so we're done.
*/
break;
}
}
if (lineNum < totalLines) {
if (tkTextDebug) {
char buffer[4 * TCL_INTEGER_SPACE + 3];
sprintf(buffer, "%d %d %d %d",
lineNum, endLine, totalLines, count);
LOG("tk_textInvalidateLine", buffer);
}
/*
* Now update the line's metrics if necessary.
*/
if (TkBTreeLinePixelEpoch(textPtr, linePtr)
!= textPtr->dInfoPtr->lineMetricUpdateEpoch) {
if (doThisMuch == -1) {
count += 8 * TkTextUpdateOneLine(textPtr, linePtr, 0,
NULL, 0);
} else {
TkTextIndex index;
TkTextIndex *indexPtr;
int pixelHeight;
/*
* If the metric epoch is the same as the widget's epoch,
* then we know that indexPtrs are still valid, and if the
* cached metricIndex (if any) is for the same line as we
* wish to examine, then we are looking at a long line
* wrapped many times, which we will examine in pieces.
*/
if (textPtr->dInfoPtr->metricEpoch ==
textPtr->sharedTextPtr->stateEpoch &&
textPtr->dInfoPtr->metricIndex.linePtr==linePtr) {
indexPtr = &textPtr->dInfoPtr->metricIndex;
pixelHeight = textPtr->dInfoPtr->metricPixelHeight;
} else {
/*
* We must reset the partial line height calculation
* data here, so we don't use it when it is out of
* date.
*/
textPtr->dInfoPtr->metricEpoch = -1;
index.tree = textPtr->sharedTextPtr->tree;
index.linePtr = linePtr;
index.byteIndex = 0;
index.textPtr = NULL;
indexPtr = &index;
pixelHeight = 0;
}
/*
* Update the line and update the counter, counting 8 for
* each display line we actually re-layout.
*/
count += 8 * TkTextUpdateOneLine(textPtr, linePtr,
pixelHeight, indexPtr, 1);
if (indexPtr->linePtr == linePtr) {
/*
* We didn't complete the logical line, because it
* produced very many display lines - it must be a
* long line wrapped many times. So we must cache as
* far as we got for next time around.
*/
if (pixelHeight == 0) {
/*
* These have already been stored, unless we just
* started the new line.
*/
textPtr->dInfoPtr->metricIndex = index;
textPtr->dInfoPtr->metricEpoch =
textPtr->sharedTextPtr->stateEpoch;
}
textPtr->dInfoPtr->metricPixelHeight =
TkBTreeLinePixelCount(textPtr, linePtr);
break;
} else {
/*
* We're done with this long line.
*/
textPtr->dInfoPtr->metricEpoch = -1;
}
}
} else {
/*
* This line is already up to date. That means there's nothing
* to do here.
*/
}
} else {
/*
* We must never recalculate the height of the last artificial
* line. It must stay at zero, and if we recalculate it, it will
* change.
*/
if (endLine >= totalLines) {
lineNum = endLine;
break;
}
/*
* Set things up for the next loop through.
*/
lineNum = -1;
}
count++;
if (doThisMuch != -1 && count >= doThisMuch) {
break;
}
}
if (doThisMuch == -1) {
/*
* If we were requested to provide a full update, then also update the
* scrollbar.
*/
GetYView(textPtr->interp, textPtr, 1);
}
return lineNum;
}
/*
*----------------------------------------------------------------------
*
* TkTextInvalidateLineMetrics, TextInvalidateLineMetrics --
*
* Mark a number of text lines as having invalid line metric
* calculations. Never call this with linePtr as the last (artificial)
* line in the text. Depending on 'action' which indicates whether the
* given lines are simply invalid or have been inserted or deleted, the
* pre-existing asynchronous line update range may need to be adjusted.
*
* If linePtr is NULL then 'lineCount' and 'action' are ignored and all
* lines are invalidated.
*
* Results:
* None.
*
* Side effects:
* May schedule an asychronous callback.
*
*----------------------------------------------------------------------
*/
void
TkTextInvalidateLineMetrics(
TkSharedText *sharedTextPtr,/* Shared widget section for all peers, or
* NULL. */
TkText *textPtr, /* Widget record for text widget. */
TkTextLine *linePtr, /* Invalidation starts from this line. */
int lineCount, /* And includes this many following lines. */
int action) /* Indicates what type of invalidation
* occurred (insert, delete, or simple). */
{
if (sharedTextPtr == NULL) {
TextInvalidateLineMetrics(textPtr, linePtr, lineCount, action);
} else {
textPtr = sharedTextPtr->peers;
while (textPtr != NULL) {
TextInvalidateLineMetrics(textPtr, linePtr, lineCount, action);
textPtr = textPtr->next;
}
}
}
static void
TextInvalidateLineMetrics(
TkText *textPtr, /* Widget record for text widget. */
TkTextLine *linePtr, /* Invalidation starts from this line. */
int lineCount, /* And includes this many following lines. */
int action) /* Indicates what type of invalidation
* occurred (insert, delete, or simple). */
{
int fromLine;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
if (linePtr != NULL) {
int counter = lineCount;
fromLine = TkBTreeLinesTo(textPtr, linePtr);
/*
* Invalidate the height calculations of each line in the given range.
*/
TkBTreeLinePixelEpoch(textPtr, linePtr) = 0;
while (counter > 0 && linePtr != NULL) {
linePtr = TkBTreeNextLine(textPtr, linePtr);
if (linePtr != NULL) {
TkBTreeLinePixelEpoch(textPtr, linePtr) = 0;
}
counter--;
}
/*
* Now schedule an examination of each line in the union of the old
* and new update ranges, including the (possibly empty) range in
* between. If that between range is not-empty, then we are examining
* more lines than is strictly necessary (but the examination of the
* extra lines should be quick, since their pixelCalculationEpoch will
* be up to date). However, to keep track of that would require more
* complex record-keeping than what we have.
*/
if (dInfoPtr->lineUpdateTimer == NULL) {
dInfoPtr->currentMetricUpdateLine = fromLine;
if (action == TK_TEXT_INVALIDATE_DELETE) {
lineCount = 0;
}
dInfoPtr->lastMetricUpdateLine = fromLine + lineCount + 1;
} else {
int toLine = fromLine + lineCount + 1;
if (action == TK_TEXT_INVALIDATE_DELETE) {
if (toLine <= dInfoPtr->currentMetricUpdateLine) {
dInfoPtr->currentMetricUpdateLine = fromLine;
if (dInfoPtr->lastMetricUpdateLine != -1) {
dInfoPtr->lastMetricUpdateLine -= lineCount;
}
} else if (fromLine <= dInfoPtr->currentMetricUpdateLine) {
dInfoPtr->currentMetricUpdateLine = fromLine;
if (toLine <= dInfoPtr->lastMetricUpdateLine) {
dInfoPtr->lastMetricUpdateLine -= lineCount;
}
} else {
if (dInfoPtr->lastMetricUpdateLine != -1) {
dInfoPtr->lastMetricUpdateLine = toLine;
}
}
} else if (action == TK_TEXT_INVALIDATE_INSERT) {
if (toLine <= dInfoPtr->currentMetricUpdateLine) {
dInfoPtr->currentMetricUpdateLine = fromLine;
if (dInfoPtr->lastMetricUpdateLine != -1) {
dInfoPtr->lastMetricUpdateLine += lineCount;
}
} else if (fromLine <= dInfoPtr->currentMetricUpdateLine) {
dInfoPtr->currentMetricUpdateLine = fromLine;
if (toLine <= dInfoPtr->lastMetricUpdateLine) {
dInfoPtr->lastMetricUpdateLine += lineCount;
}
if (toLine > dInfoPtr->lastMetricUpdateLine) {
dInfoPtr->lastMetricUpdateLine = toLine;
}
} else {
if (dInfoPtr->lastMetricUpdateLine != -1) {
dInfoPtr->lastMetricUpdateLine = toLine;
}
}
} else {
if (fromLine < dInfoPtr->currentMetricUpdateLine) {
dInfoPtr->currentMetricUpdateLine = fromLine;
}
if (dInfoPtr->lastMetricUpdateLine != -1
&& toLine > dInfoPtr->lastMetricUpdateLine) {
dInfoPtr->lastMetricUpdateLine = toLine;
}
}
}
} else {
/*
* This invalidates the height of all lines in the widget.
*/
if ((++dInfoPtr->lineMetricUpdateEpoch) == 0) {
dInfoPtr->lineMetricUpdateEpoch++;
}
/*
* This has the effect of forcing an entire new loop of update checks
* on all lines in the widget.
*/
if (dInfoPtr->lineUpdateTimer == NULL) {
dInfoPtr->currentMetricUpdateLine = -1;
}
dInfoPtr->lastMetricUpdateLine = dInfoPtr->currentMetricUpdateLine;
}
/*
* Now re-set the current update calculations.
*/
if (dInfoPtr->lineUpdateTimer == NULL) {
textPtr->refCount++;
dInfoPtr->lineUpdateTimer = Tcl_CreateTimerHandler(1,
AsyncUpdateLineMetrics, (ClientData) textPtr);
}
}
/*
*----------------------------------------------------------------------
*
* TkTextFindDisplayLineEnd --
*
* This function is invoked to find the index of the beginning or end of
* the particular display line on which the given index sits, whether
* that line is displayed or not.
*
* If 'end' is zero, we look for the start, and if 'end' is one we look
* for the end.
*
* If the beginning of the current display line is elided, and we are
* looking for the start of the line, then the returned index will be the
* first elided index on the display line.
*
* Similarly if the end of the current display line is elided and we are
* looking for the end, then the returned index will be the last elided
* index on the display line.
*
* Results:
* Modifies indexPtr to point to the given end.
*
* If xOffset is non-NULL, it is set to the x-pixel offset of the given
* original index within the given display line.
*
* Side effects:
* The combination of 'LayoutDLine' and 'FreeDLines' seems like a rather
* time-consuming way of gathering the information we need, so this would
* be a good place to look to speed up the calculations. In particular
* these calls will map and unmap embedded windows respectively, which I
* would hope isn't exactly necessary!
*
*----------------------------------------------------------------------
*/
void
TkTextFindDisplayLineEnd(
TkText *textPtr, /* Widget record for text widget. */
TkTextIndex *indexPtr, /* Index we will adjust to the display line
* start or end. */
int end, /* 0 = start, 1 = end. */
int *xOffset) /* NULL, or used to store the x-pixel offset
* of the original index within its display
* line. */
{
if (!end && indexPtr->byteIndex == 0
&& !TkTextIsElided(textPtr, indexPtr, NULL)) {
/*
* Nothing to do.
*/
if (xOffset != NULL) {
*xOffset = 0;
}
return;
} else {
TkTextIndex index = *indexPtr;
index.byteIndex = 0;
index.textPtr = NULL;
while (1) {
TkTextIndex endOfLastLine;
if (TkTextIndexBackBytes(textPtr, &index, 1, &endOfLastLine)) {
/*
* Reached beginning of text.
*/
break;
}
if (!TkTextIsElided(textPtr, &endOfLastLine, NULL)) {
/*
* The eol is not elided, so 'index' points to the start of a
* display line (as well as logical line).
*/
break;
}
/*
* indexPtr's logical line is actually merged with the previous
* logical line whose eol is elided. Continue searching back to
* get a real line start.
*/
index = endOfLastLine;
index.byteIndex = 0;
}
while (1) {
DLine *dlPtr;
int byteCount;
TkTextIndex nextLineStart;
dlPtr = LayoutDLine(textPtr, &index);
byteCount = dlPtr->byteCount;
TkTextIndexForwBytes(textPtr, &index, byteCount, &nextLineStart);
/*
* 'byteCount' goes up to the beginning of the next display line,
* so equality here says we need one more line. We try to perform
* a quick comparison which is valid for the case where the
* logical line is the same, but otherwise fall back on a full
* TkTextIndexCmp.
*/
if (((index.linePtr == indexPtr->linePtr)
&& (index.byteIndex + byteCount > indexPtr->byteIndex))
|| (dlPtr->logicalLinesMerged > 0
&& TkTextIndexCmp(&nextLineStart, indexPtr) > 0)) {
/*
* It's on this display line.
*/
if (xOffset != NULL) {
/*
* This call takes a byte index relative to the start of
* the current _display_ line, not logical line. We are
* about to overwrite indexPtr->byteIndex, so we must do
* this now.
*/
*xOffset = DlineXOfIndex(textPtr, dlPtr,
TkTextIndexCount(textPtr, &dlPtr->index, indexPtr,
COUNT_INDICES));
}
if (end) {
/*
* The index we want is one less than the number of bytes
* in the display line.
*/
TkTextIndexBackBytes(textPtr, &nextLineStart, 1, indexPtr);
} else {
*indexPtr = index;
}
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
return;
}
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
index = nextLineStart;
}
}
}
/*
*----------------------------------------------------------------------
*
* CalculateDisplayLineHeight --
*
* This function is invoked to recalculate the height of the particular
* display line which starts with the given index, whether that line is
* displayed or not.
*
* This function does not, in itself, update any cached information about
* line heights. That should be done, where necessary, by its callers.
*
* The behaviour of this function is _undefined_ if indexPtr is not
* currently at the beginning of a display line.
*
* Results:
* The number of vertical pixels used by the display line.
*
* If 'byteCountPtr' is non-NULL, then returns in that pointer the number
* of byte indices on the given display line (which can be used to update
* indexPtr in a loop).
*
* If 'mergedLinePtr' is non-NULL, then returns in that pointer the
* number of extra logical lines merged into the given display line.
*
* Side effects:
* The combination of 'LayoutDLine' and 'FreeDLines' seems like a rather
* time-consuming way of gathering the information we need, so this would
* be a good place to look to speed up the calculations. In particular
* these calls will map and unmap embedded windows respectively, which I
* would hope isn't exactly necessary!
*
*----------------------------------------------------------------------
*/
static int
CalculateDisplayLineHeight(
TkText *textPtr, /* Widget record for text widget. */
CONST TkTextIndex *indexPtr,/* The index at the beginning of the display
* line of interest. */
int *byteCountPtr, /* NULL or used to return the number of byte
* indices on the given display line. */
int *mergedLinePtr) /* NULL or used to return if the given display
* line merges with a following logical line
* (because the eol is elided). */
{
DLine *dlPtr;
int pixelHeight;
/*
* Special case for artificial last line. May be better to move this
* inside LayoutDLine.
*/
if (indexPtr->byteIndex == 0
&& TkBTreeNextLine(textPtr, indexPtr->linePtr) == NULL) {
if (byteCountPtr != NULL) {
*byteCountPtr = 0;
}
if (mergedLinePtr != NULL) {
*mergedLinePtr = 0;
}
return 0;
}
/*
* Layout, find the information we need and then free the display-line we
* laid-out. We must use 'FreeDLines' because it will actually call the
* relevant code to unmap any embedded windows which were mapped in the
* LayoutDLine call!
*/
dlPtr = LayoutDLine(textPtr, indexPtr);
pixelHeight = dlPtr->height;
if (byteCountPtr != NULL) {
*byteCountPtr = dlPtr->byteCount;
}
if (mergedLinePtr != NULL) {
*mergedLinePtr = dlPtr->logicalLinesMerged;
}
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
return pixelHeight;
}
/*
*----------------------------------------------------------------------
*
* TkTextIndexYPixels --
*
* This function is invoked to calculate the number of vertical pixels
* between the first index of the text widget and the given index. The
* range from first logical line to given logical line is determined
* using the cached values, and the range inside the given logical line
* is calculated on the fly.
*
* Results:
* The pixel distance between first pixel in the widget and the
* top of the index's current display line (could be zero).
*
* Side effects:
* Just those of 'CalculateDisplayLineHeight'.
*
*----------------------------------------------------------------------
*/
int
TkTextIndexYPixels(
TkText *textPtr, /* Widget record for text widget. */
CONST TkTextIndex *indexPtr)/* The index of which we want the pixel
* distance from top of logical line to top of
* index. */
{
int pixelHeight;
TkTextIndex index;
index = *indexPtr;
TkTextFindDisplayLineEnd(textPtr, &index, 0, NULL);
pixelHeight = TkBTreePixelsTo(textPtr, index.linePtr);
/*
* Iterate through all display-lines corresponding to the single logical
* line belonging to index, adding up the pixel height of each such
* display line as we go along, until we go past 'indexPtr'.
*/
if (index.byteIndex == 0) {
return pixelHeight;
}
index.tree = textPtr->sharedTextPtr->tree;
index.linePtr = indexPtr->linePtr;
index.byteIndex = 0;
index.textPtr = NULL;
while (1) {
int bytes, height;
/*
* Currently this call doesn't have many side-effects. However, if in
* the future we change the code so there are side-effects (such as
* adjusting linePtr->pixelHeight), then the code might not quite work
* as intended, specifically the 'linePtr->pixelHeight == pixelHeight'
* test below this while loop.
*/
height = CalculateDisplayLineHeight(textPtr, &index, &bytes, NULL);
index.byteIndex += bytes;
if (index.byteIndex > indexPtr->byteIndex) {
return pixelHeight;
}
if (height > 0) {
pixelHeight += height;
}
if (index.byteIndex == indexPtr->byteIndex) {
return pixelHeight;
}
}
}
/*
*----------------------------------------------------------------------
*
* TkTextUpdateOneLine --
*
* This function is invoked to recalculate the height of a particular
* logical line, whether that line is displayed or not.
*
* It must NEVER be called for the artificial last TkTextLine which is
* used internally for administrative purposes only. That line must
* retain its initial height of 0 otherwise the pixel height calculation
* maintained by the B-tree will be wrong.
*
* Results:
* The number of display lines in the logical line. This could be zero if
* the line is totally elided.
*
* Side effects:
* Line heights may be recalculated, and a timer to update the scrollbar
* may be installed. Also see the called function
* CalculateDisplayLineHeight for its side effects.
*
*----------------------------------------------------------------------
*/
int
TkTextUpdateOneLine(
TkText *textPtr, /* Widget record for text widget. */
TkTextLine *linePtr, /* The line of which to calculate the
* height. */
int pixelHeight, /* If indexPtr is non-NULL, then this is the
* number of pixels in the logical line
* linePtr, up to the index which has been
* given. */
TkTextIndex *indexPtr, /* Either NULL or an index at the start of a
* display line belonging to linePtr, at which
* we wish to start (e.g. up to which we have
* already calculated). On return this will be
* set to the first index on the next line. */
int partialCalc) /* Set to 1 if we are allowed to do partial
* height calculations of long-lines. In this
* case we'll only return what we know so
* far. */
{
TkTextIndex index;
int displayLines;
int mergedLines;
if (indexPtr == NULL) {
index.tree = textPtr->sharedTextPtr->tree;
index.linePtr = linePtr;
index.byteIndex = 0;
index.textPtr = NULL;
indexPtr = &index;
pixelHeight = 0;
}
/*
* Iterate through all display-lines corresponding to the single logical
* line 'linePtr' (and lines merged into this line due to eol elision),
* adding up the pixel height of each such display line as we go along.
* The final total is, therefore, the total height of all display lines
* made up by the logical line 'linePtr' and subsequent logical lines
* merged into this line.
*/
displayLines = 0;
mergedLines = 0;
while (1) {
int bytes, height, logicalLines;
/*
* Currently this call doesn't have many side-effects. However, if in
* the future we change the code so there are side-effects (such as
* adjusting linePtr->pixelHeight), then the code might not quite work
* as intended, specifically the 'linePtr->pixelHeight == pixelHeight'
* test below this while loop.
*/
height = CalculateDisplayLineHeight(textPtr, indexPtr, &bytes,
&logicalLines);
if (height > 0) {
pixelHeight += height;
displayLines++;
}
mergedLines += logicalLines;
if (TkTextIndexForwBytes(textPtr, indexPtr, bytes, indexPtr)) {
break;
}
if (mergedLines == 0) {
if (indexPtr->linePtr != linePtr) {
/*
* If we reached the end of the logical line, then either way
* we don't have a partial calculation.
*/
partialCalc = 0;
break;
}
} else {
if (indexPtr->byteIndex != 0) {
/*
* We must still be on the same wrapped line, on a new logical
* line merged with the logical line 'linePtr'.
*/
} else {
/*
* Must check if indexPtr is really a new logical line which is
* not merged with the previous line. The only code that would
* really know this is LayoutDLine, which doesn't pass the
* information on, so we have to check manually here.
*/
TkTextIndex idx;
TkTextIndexBackChars(textPtr, indexPtr, 1, &idx, COUNT_INDICES);
if (!TkTextIsElided(textPtr, &idx, NULL)) {
/*
* We've ended a logical line.
*/
partialCalc = 0;
break;
}
/*
* We must still be on the same wrapped line, on a new logical
* line merged with the logical line 'linePtr'.
*/
}
}
if (partialCalc && displayLines > 50 && mergedLines == 0) {
/*
* Only calculate 50 display lines at a time, to avoid huge
* delays. In any case it is very rare that a single line wraps 50
* times!
*
* If we have any merged lines, we must complete the full logical
* line layout here and now, because the partial-calculation code
* isn't designed to handle merged logical lines. Hence the
* 'mergedLines == 0' check.
*/
break;
}
}
if (!partialCalc) {
int changed = 0;
/*
* Cancel any partial line height calculation state.
*/
textPtr->dInfoPtr->metricEpoch = -1;
/*
* Mark the logical line as being up to date (caution: it isn't yet up
* to date, that will happen in TkBTreeAdjustPixelHeight just below).
*/
TkBTreeLinePixelEpoch(textPtr, linePtr)
= textPtr->dInfoPtr->lineMetricUpdateEpoch;
if (TkBTreeLinePixelCount(textPtr, linePtr) != pixelHeight) {
changed = 1;
}
if (mergedLines > 0) {
int i = mergedLines;
TkTextLine *mergedLinePtr;
/*
* Loop over all merged logical lines, marking them up to date
* (again, the pixel count setting will actually happen in
* TkBTreeAdjustPixelHeight).
*/
mergedLinePtr = linePtr;
while (i-- > 0) {
mergedLinePtr = TkBTreeNextLine(textPtr, mergedLinePtr);
TkBTreeLinePixelEpoch(textPtr, mergedLinePtr)
= textPtr->dInfoPtr->lineMetricUpdateEpoch;
if (TkBTreeLinePixelCount(textPtr, mergedLinePtr) != 0) {
changed = 1;
}
}
}
if (!changed) {
/*
* If there's nothing to change, then we can already return.
*/
return displayLines;
}
}
/*
* We set the line's height, but the return value is now the height of the
* entire widget, which may be used just below for reporting/debugging
* purposes.
*/
pixelHeight = TkBTreeAdjustPixelHeight(textPtr, linePtr, pixelHeight,
mergedLines);
if (tkTextDebug) {
char buffer[2 * TCL_INTEGER_SPACE + 1];
if (TkBTreeNextLine(textPtr, linePtr) == NULL) {
Tcl_Panic("Mustn't ever update line height of last artificial line");
}
sprintf(buffer, "%d %d", TkBTreeLinesTo(textPtr,linePtr), pixelHeight);
LOG("tk_textNumPixels", buffer);
}
if (textPtr->dInfoPtr->scrollbarTimer == NULL) {
textPtr->refCount++;
textPtr->dInfoPtr->scrollbarTimer = Tcl_CreateTimerHandler(200,
AsyncUpdateYScrollbar, (ClientData) textPtr);
}
return displayLines;
}
/*
*----------------------------------------------------------------------
*
* DisplayText --
*
* This function is invoked as a when-idle handler to update the display.
* It only redisplays the parts of the text widget that are out of date.
*
* Results:
* None.
*
* Side effects:
* Information is redrawn on the screen.
*
*----------------------------------------------------------------------
*/
static void
DisplayText(
ClientData clientData) /* Information about widget. */
{
register TkText *textPtr = (TkText *) clientData;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
register DLine *dlPtr;
DLine *prevPtr;
Pixmap pixmap;
int maxHeight, borders;
int bottomY = 0; /* Initialization needed only to stop compiler
* warnings. */
Tcl_Interp *interp;
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
/*
* The widget has been deleted. Don't do anything.
*/
return;
}
interp = textPtr->interp;
Tcl_Preserve((ClientData) interp);
if (tkTextDebug) {
Tcl_SetVar2(interp, "tk_textRelayout", NULL, "", TCL_GLOBAL_ONLY);
}
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
/*
* The widget has been deleted. Don't do anything.
*/
goto end;
}
if (!Tk_IsMapped(textPtr->tkwin) || (dInfoPtr->maxX <= dInfoPtr->x)
|| (dInfoPtr->maxY <= dInfoPtr->y)) {
UpdateDisplayInfo(textPtr);
dInfoPtr->flags &= ~REDRAW_PENDING;
goto doScrollbars;
}
numRedisplays++;
if (tkTextDebug) {
Tcl_SetVar2(interp, "tk_textRedraw", NULL, "", TCL_GLOBAL_ONLY);
}
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
/*
* The widget has been deleted. Don't do anything.
*/
goto end;
}
/*
* Choose a new current item if that is needed (this could cause event
* handlers to be invoked, hence the preserve/release calls and the loop,
* since the handlers could conceivably necessitate yet another current
* item calculation). The tkwin check is because the whole window could go
* away in the Tcl_Release call.
*/
while (dInfoPtr->flags & REPICK_NEEDED) {
textPtr->refCount++;
dInfoPtr->flags &= ~REPICK_NEEDED;
TkTextPickCurrent(textPtr, &textPtr->pickEvent);
if (--textPtr->refCount == 0) {
ckfree((char *) textPtr);
goto end;
}
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
goto end;
}
}
/*
* First recompute what's supposed to be displayed.
*/
UpdateDisplayInfo(textPtr);
dInfoPtr->dLinesInvalidated = 0;
#ifdef MAC_OSX_TK
/*
* Make sure that unmapped subwindows really have been unmapped.
* If the unmap request is pending as an idle request, the window
* can get redrawn on top of the widget.
*/
while (Tcl_DoOneEvent(TCL_IDLE_EVENTS|TCL_DONT_WAIT)) {}
#endif
/*
* See if it's possible to bring some parts of the screen up-to-date by
* scrolling (copying from other parts of the screen). We have to be
* particularly careful with the top and bottom lines of the display,
* since these may only be partially visible and therefore not helpful for
* some scrolling purposes.
*/
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
register DLine *dlPtr2;
int offset, height, y, oldY;
TkRegion damageRgn;
/*
* These tests are, in order:
*
* 1. If the line is already marked as invalid
* 2. If the line hasn't moved
* 3. If the line overlaps the bottom of the window and we are
* scrolling up.
* 4. If the line overlaps the top of the window and we are scrolling
* down.
*
* If any of these tests are true, then we can't scroll this line's
* part of the display.
*
* Note that even if tests 3 or 4 aren't true, we may be able to
* scroll the line, but we still need to be sure to call embedded
* window display procs on top and bottom lines if they have any
* portion non-visible (see below).
*/
if ((dlPtr->flags & OLD_Y_INVALID)
|| (dlPtr->y == dlPtr->oldY)
|| (((dlPtr->oldY + dlPtr->height) > dInfoPtr->maxY)
&& (dlPtr->y < dlPtr->oldY))
|| ((dlPtr->oldY < dInfoPtr->y) && (dlPtr->y > dlPtr->oldY))) {
continue;
}
/*
* This line is already drawn somewhere in the window so it only needs
* to be copied to its new location. See if there's a group of lines
* that can all be copied together.
*/
offset = dlPtr->y - dlPtr->oldY;
height = dlPtr->height;
y = dlPtr->y;
for (dlPtr2 = dlPtr->nextPtr; dlPtr2 != NULL;
dlPtr2 = dlPtr2->nextPtr) {
if ((dlPtr2->flags & OLD_Y_INVALID)
|| ((dlPtr2->oldY + offset) != dlPtr2->y)
|| ((dlPtr2->oldY + dlPtr2->height) > dInfoPtr->maxY)) {
break;
}
height += dlPtr2->height;
}
/*
* Reduce the height of the area being copied if necessary to avoid
* overwriting the border area.
*/
if ((y + height) > dInfoPtr->maxY) {
height = dInfoPtr->maxY -y;
}
oldY = dlPtr->oldY;
if (y < dInfoPtr->y) {
/*
* Adjust if the area being copied is going to overwrite the top
* border of the window (so the top line is only half onscreen).
*/
int y_off = dInfoPtr->y - dlPtr->y;
height -= y_off;
oldY += y_off;
y = dInfoPtr->y;
}
/*
* Update the lines we are going to scroll to show that they have been
* copied.
*/
while (1) {
/*
* The DLine already has OLD_Y_INVALID cleared.
*/
dlPtr->oldY = dlPtr->y;
if (dlPtr->nextPtr == dlPtr2) {
break;
}
dlPtr = dlPtr->nextPtr;
}
/*
* Scan through the lines following the copied ones to see if we are
* going to overwrite them with the copy operation. If so, mark them
* for redisplay.
*/
for ( ; dlPtr2 != NULL; dlPtr2 = dlPtr2->nextPtr) {
if ((!(dlPtr2->flags & OLD_Y_INVALID))
&& ((dlPtr2->oldY + dlPtr2->height) > y)
&& (dlPtr2->oldY < (y + height))) {
dlPtr2->flags |= OLD_Y_INVALID;
}
}
/*
* Now scroll the lines. This may generate damage which we handle by
* calling TextInvalidateRegion to mark the display blocks as stale.
*/
damageRgn = TkCreateRegion();
if (TkScrollWindow(textPtr->tkwin, dInfoPtr->scrollGC, dInfoPtr->x,
oldY, dInfoPtr->maxX-dInfoPtr->x, height, 0, y-oldY,
damageRgn)) {
TextInvalidateRegion(textPtr, damageRgn);
}
numCopies++;
TkDestroyRegion(damageRgn);
}
/*
* Clear the REDRAW_PENDING flag here. This is actually pretty tricky. We
* want to wait until *after* doing the scrolling, since that could
* generate more areas to redraw and don't want to reschedule a redisplay
* for them. On the other hand, we can't wait until after all the
* redisplaying, because the act of redisplaying could actually generate
* more redisplays (e.g. in the case of a nested window with event
* bindings triggered by redisplay).
*/
dInfoPtr->flags &= ~REDRAW_PENDING;
/*
* Redraw the borders if that's needed.
*/
if (dInfoPtr->flags & REDRAW_BORDERS) {
if (tkTextDebug) {
LOG("tk_textRedraw", "borders");
}
if (textPtr->tkwin == NULL) {
/*
* The widget has been deleted. Don't do anything.
*/
goto end;
}
Tk_Draw3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
textPtr->border, textPtr->highlightWidth,
textPtr->highlightWidth,
Tk_Width(textPtr->tkwin) - 2*textPtr->highlightWidth,
Tk_Height(textPtr->tkwin) - 2*textPtr->highlightWidth,
textPtr->borderWidth, textPtr->relief);
if (textPtr->highlightWidth != 0) {
GC fgGC, bgGC;
bgGC = Tk_GCForColor(textPtr->highlightBgColorPtr,
Tk_WindowId(textPtr->tkwin));
if (textPtr->flags & GOT_FOCUS) {
fgGC = Tk_GCForColor(textPtr->highlightColorPtr,
Tk_WindowId(textPtr->tkwin));
TkpDrawHighlightBorder(textPtr->tkwin, fgGC, bgGC,
textPtr->highlightWidth, Tk_WindowId(textPtr->tkwin));
} else {
TkpDrawHighlightBorder(textPtr->tkwin, bgGC, bgGC,
textPtr->highlightWidth, Tk_WindowId(textPtr->tkwin));
}
}
borders = textPtr->borderWidth + textPtr->highlightWidth;
if (textPtr->padY > 0) {
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
textPtr->border, borders, borders,
Tk_Width(textPtr->tkwin) - 2*borders, textPtr->padY,
0, TK_RELIEF_FLAT);
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
textPtr->border, borders,
Tk_Height(textPtr->tkwin) - borders - textPtr->padY,
Tk_Width(textPtr->tkwin) - 2*borders,
textPtr->padY, 0, TK_RELIEF_FLAT);
}
if (textPtr->padX > 0) {
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
textPtr->border, borders, borders + textPtr->padY,
textPtr->padX,
Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY,
0, TK_RELIEF_FLAT);
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
textPtr->border,
Tk_Width(textPtr->tkwin) - borders - textPtr->padX,
borders + textPtr->padY, textPtr->padX,
Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY,
0, TK_RELIEF_FLAT);
}
dInfoPtr->flags &= ~REDRAW_BORDERS;
}
/*
* Now we have to redraw the lines that couldn't be updated by scrolling.
* First, compute the height of the largest line and allocate an off-
* screen pixmap to use for double-buffered displays.
*/
maxHeight = -1;
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
dlPtr = dlPtr->nextPtr) {
if ((dlPtr->height > maxHeight) &&
((dlPtr->flags&OLD_Y_INVALID) || (dlPtr->oldY != dlPtr->y))) {
maxHeight = dlPtr->height;
}
bottomY = dlPtr->y + dlPtr->height;
}
/*
* There used to be a line here which restricted 'maxHeight' to be no
* larger than 'dInfoPtr->maxY', but this is incorrect for the case where
* individual lines may be taller than the widget _and_ we have smooth
* scrolling. What we can do is restrict maxHeight to be no larger than
* 'dInfoPtr->maxY + dInfoPtr->topPixelOffset'.
*/
if (maxHeight > (dInfoPtr->maxY + dInfoPtr->topPixelOffset)) {
maxHeight = (dInfoPtr->maxY + dInfoPtr->topPixelOffset);
}
if (maxHeight > 0) {
#ifndef TK_NO_DOUBLE_BUFFERING
pixmap = Tk_GetPixmap(Tk_Display(textPtr->tkwin),
Tk_WindowId(textPtr->tkwin), Tk_Width(textPtr->tkwin),
maxHeight, Tk_Depth(textPtr->tkwin));
#else
pixmap = Tk_WindowId(textPtr->tkwin);
#endif /* TK_NO_DOUBLE_BUFFERING */
for (prevPtr = NULL, dlPtr = textPtr->dInfoPtr->dLinePtr;
(dlPtr != NULL) && (dlPtr->y < dInfoPtr->maxY);
prevPtr = dlPtr, dlPtr = dlPtr->nextPtr) {
if (dlPtr->chunkPtr == NULL) {
continue;
}
if ((dlPtr->flags & OLD_Y_INVALID) || dlPtr->oldY != dlPtr->y) {
if (tkTextDebug) {
char string[TK_POS_CHARS];
TkTextPrintIndex(textPtr, &dlPtr->index, string);
LOG("tk_textRedraw", string);
}
DisplayDLine(textPtr, dlPtr, prevPtr, pixmap);
if (dInfoPtr->dLinesInvalidated) {
#ifndef TK_NO_DOUBLE_BUFFERING
Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
#endif /* TK_NO_DOUBLE_BUFFERING */
return;
}
dlPtr->oldY = dlPtr->y;
dlPtr->flags &= ~(NEW_LAYOUT | OLD_Y_INVALID);
} else if (dlPtr->chunkPtr != NULL && ((dlPtr->y < 0)
|| (dlPtr->y + dlPtr->height > dInfoPtr->maxY))) {
register TkTextDispChunk *chunkPtr;
/*
* It's the first or last DLine which are also overlapping the
* top or bottom of the window, but we decided above it wasn't
* necessary to display them (we were able to update them by
* scrolling). This is fine, except that if the lines contain
* any embedded windows, we must still call the display proc
* on them because they might need to be unmapped or they
* might need to be moved to reflect their new position.
* Otherwise, everything else moves, but the embedded window
* doesn't!
*
* So, we loop through all the chunks, calling the display
* proc of embedded windows only.
*/
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
chunkPtr = chunkPtr->nextPtr) {
int x;
if (chunkPtr->displayProc != TkTextEmbWinDisplayProc) {
continue;
}
x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curXPixelOffset;
if ((x + chunkPtr->width <= 0) || (x >= dInfoPtr->maxX)) {
/*
* Note: we have to call the displayProc even for
* chunks that are off-screen. This is needed, for
* example, so that embedded windows can be unmapped
* in this case. Display the chunk at a coordinate
* that can be clearly identified by the displayProc
* as being off-screen to the left (the displayProc
* may not be able to tell if something is off to the
* right).
*/
x = -chunkPtr->width;
}
TkTextEmbWinDisplayProc(textPtr, chunkPtr, x,
dlPtr->spaceAbove,
dlPtr->height-dlPtr->spaceAbove-dlPtr->spaceBelow,
dlPtr->baseline - dlPtr->spaceAbove, NULL,
(Drawable) None, dlPtr->y + dlPtr->spaceAbove);
}
}
}
#ifndef TK_NO_DOUBLE_BUFFERING
Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
#endif /* TK_NO_DOUBLE_BUFFERING */
}
/*
* See if we need to refresh the part of the window below the last line of
* text (if there is any such area). Refresh the padding area on the left
* too, since the insertion cursor might have been displayed there
* previously).
*/
if (dInfoPtr->topOfEof > dInfoPtr->maxY) {
dInfoPtr->topOfEof = dInfoPtr->maxY;
}
if (bottomY < dInfoPtr->topOfEof) {
if (tkTextDebug) {
LOG("tk_textRedraw", "eof");
}
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
/*
* The widget has been deleted. Don't do anything.
*/
goto end;
}
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
textPtr->border, dInfoPtr->x - textPtr->padX, bottomY,
dInfoPtr->maxX - (dInfoPtr->x - textPtr->padX),
dInfoPtr->topOfEof-bottomY, 0, TK_RELIEF_FLAT);
}
dInfoPtr->topOfEof = bottomY;
/*
* Update the vertical scrollbar, if there is one. Note: it's important to
* clear REDRAW_PENDING here, just in case the scroll function does
* something that requires redisplay.
*/
doScrollbars:
if (textPtr->flags & UPDATE_SCROLLBARS) {
textPtr->flags &= ~UPDATE_SCROLLBARS;
if (textPtr->yScrollCmd != NULL) {
GetYView(textPtr->interp, textPtr, 1);
}
if ((textPtr->tkwin == NULL) || (textPtr->flags & DESTROYED)) {
/*
* The widget has been deleted. Don't do anything.
*/
goto end;
}
/*
* Update the horizontal scrollbar, if any.
*/
if (textPtr->xScrollCmd != NULL) {
GetXView(textPtr->interp, textPtr, 1);
}
}
end:
Tcl_Release((ClientData) interp);
}
/*
*----------------------------------------------------------------------
*
* TkTextEventuallyRepick --
*
* This function is invoked whenever something happens that could change
* the current character or the tags associated with it.
*
* Results:
* None.
*
* Side effects:
* A repick is scheduled as an idle handler.
*
*----------------------------------------------------------------------
*/
void
TkTextEventuallyRepick(
TkText *textPtr) /* Widget record for text widget. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
dInfoPtr->flags |= REPICK_NEEDED;
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
dInfoPtr->flags |= REDRAW_PENDING;
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
}
/*
*----------------------------------------------------------------------
*
* TkTextRedrawRegion --
*
* This function is invoked to schedule a redisplay for a given region of
* a text widget. The redisplay itself may not occur immediately: it's
* scheduled as a when-idle handler.
*
* Results:
* None.
*
* Side effects:
* Information will eventually be redrawn on the screen.
*
*----------------------------------------------------------------------
*/
void
TkTextRedrawRegion(
TkText *textPtr, /* Widget record for text widget. */
int x, int y, /* Coordinates of upper-left corner of area to
* be redrawn, in pixels relative to textPtr's
* window. */
int width, int height) /* Width and height of area to be redrawn. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
TkRegion damageRgn = TkCreateRegion();
XRectangle rect;
rect.x = x;
rect.y = y;
rect.width = width;
rect.height = height;
TkUnionRectWithRegion(&rect, damageRgn, damageRgn);
TextInvalidateRegion(textPtr, damageRgn);
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
dInfoPtr->flags |= REDRAW_PENDING;
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
TkDestroyRegion(damageRgn);
}
/*
*----------------------------------------------------------------------
*
* TextInvalidateRegion --
*
* Mark a region of text as invalid.
*
* Results:
* None.
*
* Side effects:
* Updates the display information for the text widget.
*
*----------------------------------------------------------------------
*/
static void
TextInvalidateRegion(
TkText *textPtr, /* Widget record for text widget. */
TkRegion region) /* Region of area to redraw. */
{
register DLine *dlPtr;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
int maxY, inset;
XRectangle rect;
/*
* Find all lines that overlap the given region and mark them for
* redisplay.
*/
TkClipBox(region, &rect);
maxY = rect.y + rect.height;
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
dlPtr = dlPtr->nextPtr) {
if ((!(dlPtr->flags & OLD_Y_INVALID))
&& (TkRectInRegion(region, rect.x, dlPtr->y,
rect.width, (unsigned int) dlPtr->height) != RectangleOut)) {
dlPtr->flags |= OLD_Y_INVALID;
}
}
if (dInfoPtr->topOfEof < maxY) {
dInfoPtr->topOfEof = maxY;
}
/*
* Schedule the redisplay operation if there isn't one already scheduled.
*/
inset = textPtr->borderWidth + textPtr->highlightWidth;
if ((rect.x < (inset + textPtr->padX))
|| (rect.y < (inset + textPtr->padY))
|| ((int) (rect.x + rect.width) > (Tk_Width(textPtr->tkwin)
- inset - textPtr->padX))
|| (maxY > (Tk_Height(textPtr->tkwin) - inset - textPtr->padY))) {
dInfoPtr->flags |= REDRAW_BORDERS;
}
}
/*
*----------------------------------------------------------------------
*
* TkTextChanged, TextChanged --
*
* This function is invoked when info in a text widget is about to be
* modified in a way that changes how it is displayed (e.g. characters
* were inserted or deleted, or tag information was changed). This
* function must be called *before* a change is made, so that indexes in
* the display information are still valid.
*
* Note: if the range of indices may change geometry as well as simply
* requiring redisplay, then the caller should also call
* TkTextInvalidateLineMetrics.
*
* Results:
* None.
*
* Side effects:
* The range of character between index1Ptr (inclusive) and index2Ptr
* (exclusive) will be redisplayed at some point in the future (the
* actual redisplay is scheduled as a when-idle handler).
*
*----------------------------------------------------------------------
*/
void
TkTextChanged(
TkSharedText *sharedTextPtr,/* Shared widget section, or NULL. */
TkText *textPtr, /* Widget record for text widget, or NULL. */
CONST TkTextIndex*index1Ptr,/* Index of first character to redisplay. */
CONST TkTextIndex*index2Ptr)/* Index of character just after last one to
* redisplay. */
{
if (sharedTextPtr == NULL) {
TextChanged(textPtr, index1Ptr, index2Ptr);
} else {
textPtr = sharedTextPtr->peers;
while (textPtr != NULL) {
TextChanged(textPtr, index1Ptr, index2Ptr);
textPtr = textPtr->next;
}
}
}
static void
TextChanged(
TkText *textPtr, /* Widget record for text widget, or NULL. */
CONST TkTextIndex*index1Ptr,/* Index of first character to redisplay. */
CONST TkTextIndex*index2Ptr)/* Index of character just after last one to
* redisplay. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
DLine *firstPtr, *lastPtr;
TkTextIndex rounded;
/*
* Schedule both a redisplay and a recomputation of display information.
* It's done here rather than the end of the function for two reasons:
*
* 1. If there are no display lines to update we'll want to return
* immediately, well before the end of the function.
* 2. It's important to arrange for the redisplay BEFORE calling
* FreeDLines. The reason for this is subtle and has to do with
* embedded windows. The chunk delete function for an embedded window
* will schedule an idle handler to unmap the window. However, we want
* the idle handler for redisplay to be called first, so that it can
* put the embedded window back on the screen again (if appropriate).
* This will prevent the window from ever being unmapped, and thereby
* avoid flashing.
*/
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
/*
* Find the DLines corresponding to index1Ptr and index2Ptr. There is one
* tricky thing here, which is that we have to relayout in units of whole
* text lines: round index1Ptr back to the beginning of its text line, and
* include all the display lines after index2, up to the end of its text
* line. This is necessary because the indices stored in the display lines
* will no longer be valid. It's also needed because any edit could change
* the way lines wrap.
*/
rounded = *index1Ptr;
rounded.byteIndex = 0;
firstPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, &rounded);
if (firstPtr == NULL) {
return;
}
lastPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, index2Ptr);
while ((lastPtr != NULL)
&& (lastPtr->index.linePtr == index2Ptr->linePtr)) {
lastPtr = lastPtr->nextPtr;
}
/*
* Delete all the DLines from firstPtr up to but not including lastPtr.
*/
FreeDLines(textPtr, firstPtr, lastPtr, DLINE_UNLINK);
}
/*
*----------------------------------------------------------------------
*
* TkTextRedrawTag, TextRedrawTag --
*
* This function is invoked to request a redraw of all characters in a
* given range that have a particular tag on or off. It's called, for
* example, when tag options change.
*
* Results:
* None.
*
* Side effects:
* Information on the screen may be redrawn, and the layout of the screen
* may change.
*
*----------------------------------------------------------------------
*/
void
TkTextRedrawTag(
TkSharedText *sharedTextPtr,/* Shared widget section, or NULL. */
TkText *textPtr, /* Widget record for text widget. */
TkTextIndex *index1Ptr, /* First character in range to consider for
* redisplay. NULL means start at beginning of
* text. */
TkTextIndex *index2Ptr, /* Character just after last one to consider
* for redisplay. NULL means process all the
* characters in the text. */
TkTextTag *tagPtr, /* Information about tag. */
int withTag) /* 1 means redraw characters that have the
* tag, 0 means redraw those without. */
{
if (sharedTextPtr == NULL) {
TextRedrawTag(textPtr, index1Ptr, index2Ptr, tagPtr, withTag);
} else {
textPtr = sharedTextPtr->peers;
while (textPtr != NULL) {
TextRedrawTag(textPtr, index1Ptr, index2Ptr, tagPtr, withTag);
textPtr = textPtr->next;
}
}
}
static void
TextRedrawTag(
TkText *textPtr, /* Widget record for text widget. */
TkTextIndex *index1Ptr, /* First character in range to consider for
* redisplay. NULL means start at beginning of
* text. */
TkTextIndex *index2Ptr, /* Character just after last one to consider
* for redisplay. NULL means process all the
* characters in the text. */
TkTextTag *tagPtr, /* Information about tag. */
int withTag) /* 1 means redraw characters that have the
* tag, 0 means redraw those without. */
{
register DLine *dlPtr;
DLine *endPtr;
int tagOn;
TkTextSearch search;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
TkTextIndex *curIndexPtr;
TkTextIndex endOfText, *endIndexPtr;
/*
* Invalidate the pixel calculation of all lines in the given range. This
* may be a bit over-aggressive, so we could consider more subtle
* techniques here in the future. In particular, when we create a tag for
* the first time with '.t tag configure foo -font "Arial 20"', say, even
* though that obviously can't apply to anything at all (the tag didn't
* exist a moment ago), we invalidate every single line in the widget.
*/
if (tagPtr->affectsDisplayGeometry) {
TkTextLine *startLine, *endLine;
int lineCount;
if (index2Ptr == NULL) {
endLine = NULL;
lineCount = TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr);
} else {
endLine = index2Ptr->linePtr;
lineCount = TkBTreeLinesTo(textPtr, endLine);
}
if (index1Ptr == NULL) {
startLine = NULL;
} else {
startLine = index1Ptr->linePtr;
lineCount -= TkBTreeLinesTo(textPtr, startLine);
}
TkTextInvalidateLineMetrics(NULL, textPtr, startLine, lineCount,
TK_TEXT_INVALIDATE_ONLY);
}
/*
* Round up the starting position if it's before the first line visible on
* the screen (we only care about what's on the screen).
*/
dlPtr = dInfoPtr->dLinePtr;
if (dlPtr == NULL) {
return;
}
if ((index1Ptr == NULL) || (TkTextIndexCmp(&dlPtr->index, index1Ptr)>0)) {
index1Ptr = &dlPtr->index;
}
/*
* Set the stopping position if it wasn't specified.
*/
if (index2Ptr == NULL) {
int lastLine = TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr);
index2Ptr = TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, textPtr,
lastLine, 0, &endOfText);
}
/*
* Initialize a search through all transitions on the tag, starting with
* the first transition where the tag's current state is different from
* what it will eventually be.
*/
TkBTreeStartSearch(index1Ptr, index2Ptr, tagPtr, &search);
/*
* Make our own curIndex because at this point search.curIndex may not
* equal index1Ptr->curIndex in the case the first tag toggle comes after
* index1Ptr (See the use of FindTagStart in TkBTreeStartSearch).
*/
curIndexPtr = index1Ptr;
tagOn = TkBTreeCharTagged(index1Ptr, tagPtr);
if (tagOn != withTag) {
if (!TkBTreeNextTag(&search)) {
return;
}
curIndexPtr = &search.curIndex;
}
/*
* Schedule a redisplay and layout recalculation if they aren't already
* pending. This has to be done before calling FreeDLines, for the reason
* given in TkTextChanged.
*/
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
/*
* Each loop through the loop below is for one range of characters where
* the tag's current state is different than its eventual state. At the
* top of the loop, search contains information about the first character
* in the range.
*/
while (1) {
/*
* Find the first DLine structure in the range. Note: if the desired
* character isn't the first in its text line, then look for the
* character just before it instead. This is needed to handle the case
* where the first character of a wrapped display line just got
* smaller, so that it now fits on the line before: need to relayout
* the line containing the previous character.
*/
if (curIndexPtr->byteIndex == 0) {
dlPtr = FindDLine(textPtr, dlPtr, curIndexPtr);
} else {
TkTextIndex tmp;
tmp = *curIndexPtr;
tmp.byteIndex -= 1;
dlPtr = FindDLine(textPtr, dlPtr, &tmp);
}
if (dlPtr == NULL) {
break;
}
/*
* Find the first DLine structure that's past the end of the range.
*/
if (!TkBTreeNextTag(&search)) {
endIndexPtr = index2Ptr;
} else {
curIndexPtr = &search.curIndex;
endIndexPtr = curIndexPtr;
}
endPtr = FindDLine(textPtr, dlPtr, endIndexPtr);
if ((endPtr != NULL)
&& (TkTextIndexCmp(&endPtr->index,endIndexPtr) < 0)) {
endPtr = endPtr->nextPtr;
}
/*
* Delete all of the display lines in the range, so that they'll be
* re-layed out and redrawn.
*/
FreeDLines(textPtr, dlPtr, endPtr, DLINE_UNLINK);
dlPtr = endPtr;
/*
* Find the first text line in the next range.
*/
if (!TkBTreeNextTag(&search)) {
break;
}
}
}
/*
*----------------------------------------------------------------------
*
* TkTextRelayoutWindow --
*
* This function is called when something has happened that invalidates
* the whole layout of characters on the screen, such as a change in a
* configuration option for the overall text widget or a change in the
* window size. It causes all display information to be recomputed and
* the window to be redrawn.
*
* Results:
* None.
*
* Side effects:
* All the display information will be recomputed for the window and the
* window will be redrawn.
*
*----------------------------------------------------------------------
*/
void
TkTextRelayoutWindow(
TkText *textPtr, /* Widget record for text widget. */
int mask) /* OR'd collection of bits showing what has
* changed. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
GC newGC;
XGCValues gcValues;
/*
* Schedule the window redisplay. See TkTextChanged for the reason why
* this has to be done before any calls to FreeDLines.
*/
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
dInfoPtr->flags |= REDRAW_PENDING|REDRAW_BORDERS|DINFO_OUT_OF_DATE
|REPICK_NEEDED;
/*
* (Re-)create the graphics context for drawing the traversal highlight.
*/
gcValues.graphics_exposures = False;
newGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures, &gcValues);
if (dInfoPtr->copyGC != None) {
Tk_FreeGC(textPtr->display, dInfoPtr->copyGC);
}
dInfoPtr->copyGC = newGC;
/*
* Throw away all the current layout information.
*/
FreeDLines(textPtr, dInfoPtr->dLinePtr, NULL, DLINE_UNLINK);
dInfoPtr->dLinePtr = NULL;
/*
* Recompute some overall things for the layout. Even if the window gets
* very small, pretend that there's at least one pixel of drawing space in
* it.
*/
if (textPtr->highlightWidth < 0) {
textPtr->highlightWidth = 0;
}
dInfoPtr->x = textPtr->highlightWidth + textPtr->borderWidth
+ textPtr->padX;
dInfoPtr->y = textPtr->highlightWidth + textPtr->borderWidth
+ textPtr->padY;
dInfoPtr->maxX = Tk_Width(textPtr->tkwin) - textPtr->highlightWidth
- textPtr->borderWidth - textPtr->padX;
if (dInfoPtr->maxX <= dInfoPtr->x) {
dInfoPtr->maxX = dInfoPtr->x + 1;
}
/*
* This is the only place where dInfoPtr->maxY is set.
*/
dInfoPtr->maxY = Tk_Height(textPtr->tkwin) - textPtr->highlightWidth
- textPtr->borderWidth - textPtr->padY;
if (dInfoPtr->maxY <= dInfoPtr->y) {
dInfoPtr->maxY = dInfoPtr->y + 1;
}
dInfoPtr->topOfEof = dInfoPtr->maxY;
/*
* If the upper-left character isn't the first in a line, recompute it.
* This is necessary because a change in the window's size or options
* could change the way lines wrap.
*/
if (textPtr->topIndex.byteIndex != 0) {
TkTextFindDisplayLineEnd(textPtr, &textPtr->topIndex, 0, NULL);
}
/*
* Invalidate cached scrollbar positions, so that scrollbars sliders will
* be udpated.
*/
dInfoPtr->xScrollFirst = dInfoPtr->xScrollLast = -1;
dInfoPtr->yScrollFirst = dInfoPtr->yScrollLast = -1;
if (mask & TK_TEXT_LINE_GEOMETRY) {
/*
* Set up line metric recalculation.
*
* Avoid the special zero value, since that is used to mark individual
* lines as being out of date.
*/
if ((++dInfoPtr->lineMetricUpdateEpoch) == 0) {
dInfoPtr->lineMetricUpdateEpoch++;
}
dInfoPtr->currentMetricUpdateLine = -1;
/*
* Also cancel any partial line-height calculations (for long-wrapped
* lines) in progress.
*/
dInfoPtr->metricEpoch = -1;
if (dInfoPtr->lineUpdateTimer == NULL) {
textPtr->refCount++;
dInfoPtr->lineUpdateTimer = Tcl_CreateTimerHandler(1,
AsyncUpdateLineMetrics, (ClientData) textPtr);
}
}
}
/*
*----------------------------------------------------------------------
*
* TkTextSetYView --
*
* This function is called to specify what lines are to be displayed in a
* text widget.
*
* Results:
* None.
*
* Side effects:
* The display will (eventually) be updated so that the position given by
* "indexPtr" is visible on the screen at the position determined by
* "pickPlace".
*
*----------------------------------------------------------------------
*/
void
TkTextSetYView(
TkText *textPtr, /* Widget record for text widget. */
TkTextIndex *indexPtr, /* Position that is to appear somewhere in the
* view. */
int pickPlace) /* 0 means the given index must appear exactly
* at the top of the screen. TK_TEXT_PICKPLACE
* (-1) means we get to pick where it appears:
* minimize screen motion or else display line
* at center of screen. TK_TEXT_NOPIXELADJUST
* (-2) indicates to make the given index the
* top line, but if it is already the top
* line, don't nudge it up or down by a few
* pixels just to make sure it is entirely
* displayed. Positive numbers indicate the
* number of pixels of the index's line which
* are to be off the top of the screen. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
register DLine *dlPtr;
int bottomY, close, lineIndex;
TkTextIndex tmpIndex, rounded;
int lineHeight;
/*
* If the specified position is the extra line at the end of the text,
* round it back to the last real line.
*/
lineIndex = TkBTreeLinesTo(textPtr, indexPtr->linePtr);
if (lineIndex == TkBTreeNumLines(indexPtr->tree, textPtr)) {
TkTextIndexBackChars(textPtr, indexPtr, 1, &rounded, COUNT_INDICES);
indexPtr = &rounded;
}
if (pickPlace == TK_TEXT_NOPIXELADJUST) {
if (textPtr->topIndex.linePtr == indexPtr->linePtr
&& textPtr->topIndex.byteIndex == indexPtr->byteIndex) {
pickPlace = dInfoPtr->topPixelOffset;
} else {
pickPlace = 0;
}
}
if (pickPlace != TK_TEXT_PICKPLACE) {
/*
* The specified position must go at the top of the screen. Just leave
* all the DLine's alone: we may be able to reuse some of the
* information that's currently on the screen without redisplaying it
* all.
*/
textPtr->topIndex = *indexPtr;
if (indexPtr->byteIndex != 0) {
TkTextFindDisplayLineEnd(textPtr, &textPtr->topIndex, 0, NULL);
}
dInfoPtr->newTopPixelOffset = pickPlace;
goto scheduleUpdate;
}
/*
* We have to pick where to display the index. First, bring the display
* information up to date and see if the index will be completely visible
* in the current screen configuration. If so then there's nothing to do.
*/
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
dlPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, indexPtr);
if (dlPtr != NULL) {
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
/*
* Part of the line hangs off the bottom of the screen; pretend
* the whole line is off-screen.
*/
dlPtr = NULL;
} else {
if (TkTextIndexCmp(&dlPtr->index, indexPtr) <= 0) {
if (dInfoPtr->dLinePtr == dlPtr && dInfoPtr->topPixelOffset != 0) {
/*
* It is on the top line, but that line is hanging off the top
* of the screen. Change the top overlap to zero and update.
*/
dInfoPtr->newTopPixelOffset = 0;
goto scheduleUpdate;
}
return;
}
}
}
/*
* The desired line isn't already on-screen. Figure out what it means to
* be "close" to the top or bottom of the screen. Close means within 1/3
* of the screen height or within three lines, whichever is greater.
*
* If the line is not close, place it in the center of the window.
*/
lineHeight = CalculateDisplayLineHeight(textPtr, indexPtr, NULL, NULL);
/*
* It would be better if 'bottomY' were calculated using the actual height
* of the given line, not 'textPtr->charHeight'.
*/
bottomY = (dInfoPtr->y + dInfoPtr->maxY + lineHeight)/2;
close = (dInfoPtr->maxY - dInfoPtr->y)/3;
if (close < 3*textPtr->charHeight) {
close = 3*textPtr->charHeight;
}
if (dlPtr != NULL) {
int overlap;
/*
* The desired line is above the top of screen. If it is "close" to
* the top of the window then make it the top line on the screen.
* MeasureUp counts from the bottom of the given index upwards, so we
* add an extra half line to be sure we count far enough.
*/
MeasureUp(textPtr, &textPtr->topIndex, close + textPtr->charHeight/2,
&tmpIndex, &overlap);
if (TkTextIndexCmp(&tmpIndex, indexPtr) <= 0) {
textPtr->topIndex = *indexPtr;
TkTextFindDisplayLineEnd(textPtr, &textPtr->topIndex, 0, NULL);
dInfoPtr->newTopPixelOffset = 0;
goto scheduleUpdate;
}
} else {
int overlap;
/*
* The desired line is below the bottom of the screen. If it is
* "close" to the bottom of the screen then position it at the bottom
* of the screen.
*/
MeasureUp(textPtr, indexPtr, close + lineHeight
- textPtr->charHeight/2, &tmpIndex, &overlap);
if (FindDLine(textPtr, dInfoPtr->dLinePtr, &tmpIndex) != NULL) {
bottomY = dInfoPtr->maxY - dInfoPtr->y;
}
}
/*
* Our job now is to arrange the display so that indexPtr appears as low
* on the screen as possible but with its bottom no lower than bottomY.
* BottomY is the bottom of the window if the desired line is just below
* the current screen, otherwise it is a half-line lower than the center
* of the window.
*/
MeasureUp(textPtr, indexPtr, bottomY, &textPtr->topIndex,
&dInfoPtr->newTopPixelOffset);
scheduleUpdate:
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
}
/*
*--------------------------------------------------------------
*
* TkTextMeasureDown --
*
* Given one index, find the index of the first character on the highest
* display line that would be displayed no more than "distance" pixels
* below the top of the given index.
*
* Results:
* The srcPtr is manipulated in place to reflect the new position. We
* return the number of pixels by which 'distance' overlaps the srcPtr.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
TkTextMeasureDown(
TkText *textPtr, /* Text widget in which to measure. */
TkTextIndex *srcPtr, /* Index of character from which to start
* measuring. */
int distance) /* Vertical distance in pixels measured from
* the top pixel in srcPtr's logical line. */
{
TkTextLine *lastLinePtr;
DLine *dlPtr;
TkTextIndex loop;
lastLinePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree, textPtr,
TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr));
do {
dlPtr = LayoutDLine(textPtr, srcPtr);
dlPtr->nextPtr = NULL;
if (distance < dlPtr->height) {
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
break;
}
distance -= dlPtr->height;
TkTextIndexForwBytes(textPtr, srcPtr, dlPtr->byteCount, &loop);
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
if (loop.linePtr == lastLinePtr) {
break;
}
*srcPtr = loop;
} while (distance > 0);
return distance;
}
/*
*--------------------------------------------------------------
*
* MeasureUp --
*
* Given one index, find the index of the first character on the highest
* display line that would be displayed no more than "distance" pixels
* above the given index.
*
* If this function is called with distance=0, it simply finds the first
* index on the same display line as srcPtr. However, there is a another
* function TkTextFindDisplayLineEnd designed just for that task which is
* probably better to use.
*
* Results:
* *dstPtr is filled in with the index of the first character on a
* display line. The display line is found by measuring up "distance"
* pixels above the pixel just below an imaginary display line that
* contains srcPtr. If the display line that covers this coordinate
* actually extends above the coordinate, then return any excess pixels
* in *overlap, if that is non-NULL.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
MeasureUp(
TkText *textPtr, /* Text widget in which to measure. */
CONST TkTextIndex *srcPtr, /* Index of character from which to start
* measuring. */
int distance, /* Vertical distance in pixels measured from
* the pixel just below the lowest one in
* srcPtr's line. */
TkTextIndex *dstPtr, /* Index to fill in with result. */
int *overlap) /* Used to store how much of the final index
* returned was not covered by 'distance'. */
{
int lineNum; /* Number of current line. */
int bytesToCount; /* Maximum number of bytes to measure in
* current line. */
TkTextIndex index;
DLine *dlPtr, *lowestPtr;
bytesToCount = srcPtr->byteIndex + 1;
index.tree = srcPtr->tree;
for (lineNum = TkBTreeLinesTo(textPtr, srcPtr->linePtr); lineNum >= 0;
lineNum--) {
/*
* Layout an entire text line (potentially > 1 display line).
*
* For the first line, which contains srcPtr, only layout the part up
* through srcPtr (bytesToCount is non-infinite to accomplish this).
* Make a list of all the display lines in backwards order (the lowest
* DLine on the screen is first in the list).
*/
index.linePtr = TkBTreeFindLine(srcPtr->tree, textPtr, lineNum);
index.byteIndex = 0;
lowestPtr = NULL;
do {
dlPtr = LayoutDLine(textPtr, &index);
dlPtr->nextPtr = lowestPtr;
lowestPtr = dlPtr;
TkTextIndexForwBytes(textPtr, &index, dlPtr->byteCount, &index);
bytesToCount -= dlPtr->byteCount;
} while (bytesToCount>0 && index.linePtr==dlPtr->index.linePtr);
/*
* Scan through the display lines to see if we've covered enough
* vertical distance. If so, save the starting index for the line at
* the desired location. If distance was zero to start with then we
* simply get the first index on the same display line as the original
* index.
*/
for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
distance -= dlPtr->height;
if (distance <= 0) {
*dstPtr = dlPtr->index;
if (overlap != NULL) {
*overlap = -distance;
}
break;
}
}
/*
* Discard the display lines, then either return or prepare for the
* next display line to lay out.
*/
FreeDLines(textPtr, lowestPtr, NULL, DLINE_FREE);
if (distance <= 0) {
return;
}
bytesToCount = INT_MAX; /* Consider all chars. in next line. */
}
/*
* Ran off the beginning of the text. Return the first character in the
* text.
*/
TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, textPtr, 0, 0, dstPtr);
if (overlap != NULL) {
*overlap = 0;
}
}
/*
*--------------------------------------------------------------
*
* TkTextSeeCmd --
*
* This function is invoked to process the "see" option for the widget
* command for text widgets. See the user documentation for details on
* what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
TkTextSeeCmd(
TkText *textPtr, /* Information about text widget. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *CONST objv[]) /* Argument objects. Someone else has already
* parsed this command enough to know that
* objv[1] is "see". */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
TkTextIndex index;
int x, y, width, height, lineWidth, byteCount, oneThird, delta;
DLine *dlPtr;
TkTextDispChunk *chunkPtr;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "index");
return TCL_ERROR;
}
if (TkTextGetObjIndex(interp, textPtr, objv[2], &index) != TCL_OK) {
return TCL_ERROR;
}
/*
* If the specified position is the extra line at the end of the text,
* round it back to the last real line.
*/
if (TkBTreeLinesTo(textPtr, index.linePtr)
== TkBTreeNumLines(index.tree, textPtr)) {
TkTextIndexBackChars(textPtr, &index, 1, &index, COUNT_INDICES);
}
/*
* First get the desired position into the vertical range of the window.
*/
TkTextSetYView(textPtr, &index, TK_TEXT_PICKPLACE);
/*
* Now make sure that the character is in view horizontally.
*/
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
lineWidth = dInfoPtr->maxX - dInfoPtr->x;
if (dInfoPtr->maxLength < lineWidth) {
return TCL_OK;
}
/*
* Find the display line containing the desired index. dlPtr may be NULL
* if the widget is not mapped. [Bug #641778]
*/
dlPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, &index);
if (dlPtr == NULL) {
return TCL_OK;
}
/*
* Find the chunk within the display line that contains the desired
* index. The chunks making the display line are skipped up to but not
* including the one crossing index. Skipping is done based on a
* byteCount offset possibly spanning several logical lines in case
* they are elided.
*/
byteCount = TkTextIndexCount(textPtr, &dlPtr->index, &index,
COUNT_INDICES);
for (chunkPtr = dlPtr->chunkPtr; chunkPtr != NULL ;
chunkPtr = chunkPtr->nextPtr) {
if (byteCount < chunkPtr->numBytes) {
break;
}
byteCount -= chunkPtr->numBytes;
}
/*
* Call a chunk-specific function to find the horizontal range of the
* character within the chunk.
*/
(*chunkPtr->bboxProc)(textPtr, chunkPtr, byteCount,
dlPtr->y + dlPtr->spaceAbove,
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
dlPtr->baseline - dlPtr->spaceAbove, &x, &y, &width,
&height);
delta = x - dInfoPtr->curXPixelOffset;
oneThird = lineWidth/3;
if (delta < 0) {
if (delta < -oneThird) {
dInfoPtr->newXPixelOffset = (x - lineWidth/2);
} else {
dInfoPtr->newXPixelOffset -= ((-delta) );
}
} else {
delta -= (lineWidth - width);
if (delta > 0) {
if (delta > oneThird) {
dInfoPtr->newXPixelOffset = (x - lineWidth/2);
} else {
dInfoPtr->newXPixelOffset += (delta );
}
} else {
return TCL_OK;
}
}
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
dInfoPtr->flags |= REDRAW_PENDING;
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* TkTextXviewCmd --
*
* This function is invoked to process the "xview" option for the widget
* command for text widgets. See the user documentation for details on
* what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
TkTextXviewCmd(
TkText *textPtr, /* Information about text widget. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *CONST objv[]) /* Argument objects. Someone else has already
* parsed this command enough to know that
* objv[1] is "xview". */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
int type, count;
double fraction;
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
if (objc == 2) {
GetXView(interp, textPtr, 0);
return TCL_OK;
}
type = TextGetScrollInfoObj(interp, textPtr, objc, objv,
&fraction, &count);
switch (type) {
case TKTEXT_SCROLL_ERROR:
return TCL_ERROR;
case TKTEXT_SCROLL_MOVETO:
if (fraction > 1.0) {
fraction = 1.0;
}
if (fraction < 0) {
fraction = 0;
}
dInfoPtr->newXPixelOffset = (int)
(fraction * dInfoPtr->maxLength + 0.5);
break;
case TKTEXT_SCROLL_PAGES: {
int pixelsPerPage;
pixelsPerPage = (dInfoPtr->maxX-dInfoPtr->x) - 2*textPtr->charWidth;
if (pixelsPerPage < 1) {
pixelsPerPage = 1;
}
dInfoPtr->newXPixelOffset += pixelsPerPage * count;
break;
}
case TKTEXT_SCROLL_UNITS:
dInfoPtr->newXPixelOffset += count * textPtr->charWidth;
break;
case TKTEXT_SCROLL_PIXELS:
dInfoPtr->newXPixelOffset += count;
break;
}
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
dInfoPtr->flags |= REDRAW_PENDING;
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* YScrollByPixels --
*
* This function is called to scroll a text widget up or down by a given
* number of pixels.
*
* Results:
* None.
*
* Side effects:
* The view in textPtr's window changes to reflect the value of "offset".
*
*----------------------------------------------------------------------
*/
static void
YScrollByPixels(
TkText *textPtr, /* Widget to scroll. */
int offset) /* Amount by which to scroll, in pixels.
* Positive means that information later in
* text becomes visible, negative means that
* information earlier in the text becomes
* visible. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
if (offset < 0) {
/*
* Now we want to measure up this number of pixels from the top of the
* screen. But the top line may not be totally visible. Note that
* 'count' is negative here.
*/
offset -= CalculateDisplayLineHeight(textPtr,
&textPtr->topIndex, NULL, NULL) - dInfoPtr->topPixelOffset;
MeasureUp(textPtr, &textPtr->topIndex, -offset,
&textPtr->topIndex, &dInfoPtr->newTopPixelOffset);
} else if (offset > 0) {
DLine *dlPtr;
TkTextLine *lastLinePtr;
TkTextIndex newIdx;
/*
* Scrolling down by pixels. Layout lines starting at the top index
* and count through the desired vertical distance.
*/
lastLinePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree, textPtr,
TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr));
offset += dInfoPtr->topPixelOffset;
dInfoPtr->newTopPixelOffset = 0;
while (offset > 0) {
dlPtr = LayoutDLine(textPtr, &textPtr->topIndex);
dlPtr->nextPtr = NULL;
TkTextIndexForwBytes(textPtr, &textPtr->topIndex,
dlPtr->byteCount, &newIdx);
if (offset <= dlPtr->height) {
/*
* Adjust the top overlap accordingly.
*/
dInfoPtr->newTopPixelOffset = offset;
}
offset -= dlPtr->height;
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
if (newIdx.linePtr == lastLinePtr || offset <= 0) {
break;
}
textPtr->topIndex = newIdx;
}
} else {
/*
* offset = 0, so no scrolling required.
*/
return;
}
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
}
/*
*----------------------------------------------------------------------
*
* YScrollByLines --
*
* This function is called to scroll a text widget up or down by a given
* number of lines.
*
* Results:
* None.
*
* Side effects:
* The view in textPtr's window changes to reflect the value of "offset".
*
*----------------------------------------------------------------------
*/
static void
YScrollByLines(
TkText *textPtr, /* Widget to scroll. */
int offset) /* Amount by which to scroll, in display
* lines. Positive means that information
* later in text becomes visible, negative
* means that information earlier in the text
* becomes visible. */
{
int i, bytesToCount, lineNum;
TkTextIndex newIdx, index;
TkTextLine *lastLinePtr;
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
DLine *dlPtr, *lowestPtr;
if (offset < 0) {
/*
* Must scroll up (to show earlier information in the text). The code
* below is similar to that in MeasureUp, except that it counts lines
* instead of pixels.
*/
bytesToCount = textPtr->topIndex.byteIndex + 1;
index.tree = textPtr->sharedTextPtr->tree;
offset--; /* Skip line containing topIndex. */
for (lineNum = TkBTreeLinesTo(textPtr, textPtr->topIndex.linePtr);
lineNum >= 0; lineNum--) {
index.linePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree,
textPtr, lineNum);
index.byteIndex = 0;
lowestPtr = NULL;
do {
dlPtr = LayoutDLine(textPtr, &index);
dlPtr->nextPtr = lowestPtr;
lowestPtr = dlPtr;
TkTextIndexForwBytes(textPtr, &index, dlPtr->byteCount,&index);
bytesToCount -= dlPtr->byteCount;
} while ((bytesToCount > 0)
&& (index.linePtr == dlPtr->index.linePtr));
for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
offset++;
if (offset == 0) {
textPtr->topIndex = dlPtr->index;
break;
}
}
/*
* Discard the display lines, then either return or prepare for
* the next display line to lay out.
*/
FreeDLines(textPtr, lowestPtr, NULL, DLINE_FREE);
if (offset >= 0) {
goto scheduleUpdate;
}
bytesToCount = INT_MAX;
}
/*
* Ran off the beginning of the text. Return the first character in
* the text, and make sure we haven't left anything overlapping the
* top window border.
*/
TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, textPtr, 0, 0,
&textPtr->topIndex);
dInfoPtr->newTopPixelOffset = 0;
} else {
/*
* Scrolling down, to show later information in the text. Just count
* lines from the current top of the window.
*/
lastLinePtr = TkBTreeFindLine(textPtr->sharedTextPtr->tree, textPtr,
TkBTreeNumLines(textPtr->sharedTextPtr->tree, textPtr));
for (i = 0; i < offset; i++) {
dlPtr = LayoutDLine(textPtr, &textPtr->topIndex);
if (dlPtr->length == 0 && dlPtr->height == 0) {
offset++;
}
dlPtr->nextPtr = NULL;
TkTextIndexForwBytes(textPtr, &textPtr->topIndex,
dlPtr->byteCount, &newIdx);
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE);
if (newIdx.linePtr == lastLinePtr) {
break;
}
textPtr->topIndex = newIdx;
}
}
scheduleUpdate:
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
}
/*
*--------------------------------------------------------------
*
* TkTextYviewCmd --
*
* This function is invoked to process the "yview" option for the widget
* command for text widgets. See the user documentation for details on
* what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
TkTextYviewCmd(
TkText *textPtr, /* Information about text widget. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *CONST objv[]) /* Argument objects. Someone else has already
* parsed this command enough to know that
* objv[1] is "yview". */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
int pickPlace, type;
int pixels, count;
int switchLength;
double fraction;
TkTextIndex index;
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
if (objc == 2) {
GetYView(interp, textPtr, 0);
return TCL_OK;
}
/*
* Next, handle the old syntax: "pathName yview ?-pickplace? where"
*/
pickPlace = 0;
if (Tcl_GetString(objv[2])[0] == '-') {
register CONST char *switchStr =
Tcl_GetStringFromObj(objv[2], &switchLength);
if ((switchLength >= 2) && (strncmp(switchStr, "-pickplace",
(unsigned) switchLength) == 0)) {
pickPlace = 1;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 3, objv, "lineNum|index");
return TCL_ERROR;
}
}
}
if ((objc == 3) || pickPlace) {
int lineNum;
if (Tcl_GetIntFromObj(interp, objv[2+pickPlace], &lineNum) == TCL_OK) {
TkTextMakeByteIndex(textPtr->sharedTextPtr->tree, textPtr,
lineNum, 0, &index);
TkTextSetYView(textPtr, &index, 0);
return TCL_OK;
}
/*
* The argument must be a regular text index.
*/
Tcl_ResetResult(interp);
if (TkTextGetObjIndex(interp, textPtr, objv[2+pickPlace],
&index) != TCL_OK) {
return TCL_ERROR;
}
TkTextSetYView(textPtr, &index, (pickPlace ? TK_TEXT_PICKPLACE : 0));
return TCL_OK;
}
/*
* New syntax: dispatch based on objv[2].
*/
type = TextGetScrollInfoObj(interp, textPtr, objc,objv, &fraction, &count);
switch (type) {
case TKTEXT_SCROLL_ERROR:
return TCL_ERROR;
case TKTEXT_SCROLL_MOVETO: {
int numPixels = TkBTreeNumPixels(textPtr->sharedTextPtr->tree,
textPtr);
int topMostPixel;
if (numPixels == 0) {
/*
* If the window is totally empty no scrolling is needed, and the
* TkTextMakePixelIndex call below will fail.
*/
break;
}
if (fraction > 1.0) {
fraction = 1.0;
}
if (fraction < 0) {
fraction = 0;
}
/*
* Calculate the pixel count for the new topmost pixel in the topmost
* line of the window. Note that the interpretation of 'fraction' is
* that it counts from 0 (top pixel in buffer) to 1.0 (one pixel past
* the last pixel in buffer).
*/
topMostPixel = (int) (0.5 + fraction * numPixels);
if (topMostPixel >= numPixels) {
topMostPixel = numPixels -1;
}
/*
* This function returns the number of pixels by which the given line
* should overlap the top of the visible screen.
*
* This is then used to provide smooth scrolling.
*/
pixels = TkTextMakePixelIndex(textPtr, topMostPixel, &index);
TkTextSetYView(textPtr, &index, pixels);
break;
}
case TKTEXT_SCROLL_PAGES: {
/*
* Scroll up or down by screenfuls. Actually, use the window height
* minus two lines, so that there's some overlap between adjacent
* pages.
*/
int height = dInfoPtr->maxY - dInfoPtr->y;
if (textPtr->charHeight * 4 >= height) {
/*
* A single line is more than a quarter of the display. We choose
* to scroll by 3/4 of the height instead.
*/
pixels = 3*height/4;
if (pixels < textPtr->charHeight) {
/*
* But, if 3/4 of the height is actually less than a single
* typical character height, then scroll by the minimum of the
* linespace or the total height.
*/
if (textPtr->charHeight < height) {
pixels = textPtr->charHeight;
} else {
pixels = height;
}
}
pixels *= count;
} else {
pixels = (height - 2*textPtr->charHeight)*count;
}
YScrollByPixels(textPtr, pixels);
break;
}
case TKTEXT_SCROLL_PIXELS:
YScrollByPixels(textPtr, count);
break;
case TKTEXT_SCROLL_UNITS:
YScrollByLines(textPtr, count);
break;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* TkTextScanCmd --
*
* This function is invoked to process the "scan" option for the widget
* command for text widgets. See the user documentation for details on
* what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
TkTextScanCmd(
register TkText *textPtr, /* Information about text widget. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *CONST objv[]) /* Argument objects. Someone else has already
* parsed this command enough to know that
* objv[1] is "scan". */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
TkTextIndex index;
int c, x, y, totalScroll, gain=10;
size_t length;
if ((objc != 5) && (objc != 6)) {
Tcl_WrongNumArgs(interp, 2, objv, "mark x y");
Tcl_AppendResult(interp, " or \"", Tcl_GetString(objv[0]),
" scan dragto x y ?gain?\"", NULL);
/*
* Ought to be:
* Tcl_WrongNumArgs(interp, 2, objc, "dragto x y ?gain?");
*/
return TCL_ERROR;
}
if (Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK) {
return TCL_ERROR;
}
if (Tcl_GetIntFromObj(interp, objv[4], &y) != TCL_OK) {
return TCL_ERROR;
}
if ((objc == 6) && (Tcl_GetIntFromObj(interp, objv[5], &gain) != TCL_OK)) {
return TCL_ERROR;
}
c = Tcl_GetString(objv[2])[0];
length = strlen(Tcl_GetString(objv[2]));
if (c=='d' && strncmp(Tcl_GetString(objv[2]), "dragto", length)==0) {
int newX, maxX;
/*
* Amplify the difference between the current position and the mark
* position to compute how much the view should shift, then update the
* mark position to correspond to the new view. If we run off the edge
* of the text, reset the mark point so that the current position
* continues to correspond to the edge of the window. This means that
* the picture will start dragging as soon as the mouse reverses
* direction (without this reset, might have to slide mouse a long
* ways back before the picture starts moving again).
*/
newX = dInfoPtr->scanMarkXPixel + gain*(dInfoPtr->scanMarkX - x);
maxX = 1 + dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x);
if (newX < 0) {
newX = 0;
dInfoPtr->scanMarkXPixel = 0;
dInfoPtr->scanMarkX = x;
} else if (newX > maxX) {
newX = maxX;
dInfoPtr->scanMarkXPixel = maxX;
dInfoPtr->scanMarkX = x;
}
dInfoPtr->newXPixelOffset = newX;
totalScroll = gain*(dInfoPtr->scanMarkY - y);
if (totalScroll != dInfoPtr->scanTotalYScroll) {
index = textPtr->topIndex;
YScrollByPixels(textPtr, totalScroll-dInfoPtr->scanTotalYScroll);
dInfoPtr->scanTotalYScroll = totalScroll;
if ((index.linePtr == textPtr->topIndex.linePtr) &&
(index.byteIndex == textPtr->topIndex.byteIndex)) {
dInfoPtr->scanTotalYScroll = 0;
dInfoPtr->scanMarkY = y;
}
}
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
dInfoPtr->flags |= REDRAW_PENDING;
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
}
} else if (c=='m' && strncmp(Tcl_GetString(objv[2]), "mark", length)==0) {
dInfoPtr->scanMarkXPixel = dInfoPtr->newXPixelOffset;
dInfoPtr->scanMarkX = x;
dInfoPtr->scanTotalYScroll = 0;
dInfoPtr->scanMarkY = y;
} else {
Tcl_AppendResult(interp, "bad scan option \"", Tcl_GetString(objv[2]),
"\": must be mark or dragto", NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* GetXView --
*
* This function computes the fractions that indicate what's visible in a
* text window and, optionally, evaluates a Tcl script to report them to
* the text's associated scrollbar.
*
* Results:
* If report is zero, then the interp's result is filled in with two real
* numbers separated by a space, giving the position of the left and
* right edges of the window as fractions from 0 to 1, where 0 means the
* left edge of the text and 1 means the right edge. If report is
* non-zero, then the interp's result isn't modified directly, but
* instead a script is evaluated in interp to report the new horizontal
* scroll position to the scrollbar (if the scroll position hasn't
* changed then no script is invoked).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
GetXView(
Tcl_Interp *interp, /* If "report" is FALSE, string describing
* visible range gets stored in the interp's
* result. */
TkText *textPtr, /* Information about text widget. */
int report) /* Non-zero means report info to scrollbar if
* it has changed. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
double first, last;
int code;
Tcl_Obj *listObj;
if (dInfoPtr->maxLength > 0) {
first = ((double) dInfoPtr->curXPixelOffset)
/ dInfoPtr->maxLength;
last = ((double) (dInfoPtr->curXPixelOffset + dInfoPtr->maxX
- dInfoPtr->x))/dInfoPtr->maxLength;
if (last > 1.0) {
last = 1.0;
}
} else {
first = 0;
last = 1.0;
}
if (!report) {
listObj = Tcl_NewListObj(0, NULL);
Tcl_ListObjAppendElement(interp, listObj, Tcl_NewDoubleObj(first));
Tcl_ListObjAppendElement(interp, listObj, Tcl_NewDoubleObj(last));
Tcl_SetObjResult(interp, listObj);
return;
}
if (FP_EQUAL_SCALE(first, dInfoPtr->xScrollFirst, dInfoPtr->maxLength) &&
FP_EQUAL_SCALE(last, dInfoPtr->xScrollLast, dInfoPtr->maxLength)) {
return;
}
dInfoPtr->xScrollFirst = first;
dInfoPtr->xScrollLast = last;
if (textPtr->xScrollCmd != NULL) {
char buf1[TCL_DOUBLE_SPACE+1];
char buf2[TCL_DOUBLE_SPACE+1];
buf1[0] = ' ';
buf2[0] = ' ';
Tcl_PrintDouble(NULL, first, buf1+1);
Tcl_PrintDouble(NULL, last, buf2+1);
code = Tcl_VarEval(interp, textPtr->xScrollCmd, buf1, buf2, NULL);
if (code != TCL_OK) {
Tcl_AddErrorInfo(interp,
"\n (horizontal scrolling command executed by text)");
Tcl_BackgroundError(interp);
}
}
}
/*
*----------------------------------------------------------------------
*
* GetYPixelCount --
*
* How many pixels are there between the absolute top of the widget and
* the top of the given DLine.
*
* While this function will work for any valid DLine, it is only ever
* called when dlPtr is the first display line in the widget (by
* 'GetYView'). This means that usually this function is a very quick
* calculation, since it can use the pre-calculated linked-list of DLines
* for height information.
*
* The only situation where this breaks down is if dlPtr's logical line
* wraps enough times to fill the text widget's current view - in this
* case we won't have enough dlPtrs in the linked list to be able to
* subtract off what we want.
*
* Results:
* The number of pixels.
*
* This value has a valid range between '0' (the very top of the widget)
* and the number of pixels in the total widget minus the pixel-height of
* the last line.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
GetYPixelCount(
TkText *textPtr, /* Information about text widget. */
DLine *dlPtr) /* Information about the layout of a given
* index. */
{
TkTextLine *linePtr = dlPtr->index.linePtr;
int count;
/*
* Get the pixel count to the top of dlPtr's logical line. The rest of the
* function is then concerned with updating 'count' for any difference
* between the top of the logical line and the display line.
*/
count = TkBTreePixelsTo(textPtr, linePtr);
/*
* For the common case where this dlPtr is also the start of the logical
* line, we can return right away. Note the implicit assumption here that
* the start of a logical line is always the start of a display line (if
* the 'elide won't elide first newline' bug is fixed, this will no longer
* necessarily be true).
*/
if (dlPtr->index.byteIndex == 0) {
return count;
}
/*
* Add on the logical line's height to reach one pixel beyond the bottom
* of the logical line. And then subtract off the heights of all the
* display lines from dlPtr to the end of its logical line.
*
* A different approach would be to lay things out from the start of the
* logical line until we reach dlPtr, but since none of those are
* pre-calculated, it'll usually take a lot longer. (But there are cases
* where it would be more efficient: say if we're on the second of 1000
* wrapped lines all from a single logical line - but that sort of
* optimization is left for the future).
*/
count += TkBTreeLinePixelCount(textPtr, linePtr);
do {
count -= dlPtr->height;
if (dlPtr->nextPtr == NULL) {
/*
* We've run out of pre-calculated display lines, so we have to
* lay them out ourselves until the end of the logical line. Here
* is where we could be clever and ask: what's faster, to layout
* all lines from here to line-end, or all lines from the original
* dlPtr to the line-start? We just assume the former.
*/
TkTextIndex index;
int notFirst = 0;
while (1) {
TkTextIndexForwBytes(textPtr, &dlPtr->index,
dlPtr->byteCount, &index);
if (notFirst) {
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
}
if (index.linePtr != linePtr) {
break;
}
dlPtr = LayoutDLine(textPtr, &index);
if (tkTextDebug) {
char string[TK_POS_CHARS];
/*
* Debugging is enabled, so keep a log of all the lines
* whose height was recalculated. The test suite uses this
* information.
*/
TkTextPrintIndex(textPtr, &index, string);
LOG("tk_textHeightCalc", string);
}
count -= dlPtr->height;
notFirst = 1;
}
break;
} else {
dlPtr = dlPtr->nextPtr;
}
} while (dlPtr->index.linePtr == linePtr);
return count;
}
/*
*----------------------------------------------------------------------
*
* GetYView --
*
* This function computes the fractions that indicate what's visible in a
* text window and, optionally, evaluates a Tcl script to report them to
* the text's associated scrollbar.
*
* Results:
* If report is zero, then the interp's result is filled in with two real
* numbers separated by a space, giving the position of the top and
* bottom of the window as fractions from 0 to 1, where 0 means the
* beginning of the text and 1 means the end. If report is non-zero, then
* the interp's result isn't modified directly, but a script is evaluated
* in interp to report the new scroll position to the scrollbar (if the
* scroll position hasn't changed then no script is invoked).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
GetYView(
Tcl_Interp *interp, /* If "report" is FALSE, string describing
* visible range gets stored in the interp's
* result. */
TkText *textPtr, /* Information about text widget. */
int report) /* Non-zero means report info to scrollbar if
* it has changed. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
double first, last;
DLine *dlPtr;
int totalPixels, code, count;
Tcl_Obj *listObj;
dlPtr = dInfoPtr->dLinePtr;
if (dlPtr == NULL) {
return;
}
totalPixels = TkBTreeNumPixels(textPtr->sharedTextPtr->tree, textPtr);
if (totalPixels == 0) {
first = 0.0;
last = 1.0;
} else {
/*
* Get the pixel count for the first visible pixel of the first
* visible line. If the first visible line is only partially visible,
* then we use 'topPixelOffset' to get the difference.
*/
count = GetYPixelCount(textPtr, dlPtr);
first = (count + dInfoPtr->topPixelOffset) / (double) totalPixels;
/*
* Add on the total number of visible pixels to get the count to one
* pixel _past_ the last visible pixel. This is how the 'yview'
* command is documented, and also explains why we are dividing by
* 'totalPixels' and not 'totalPixels-1'.
*/
while (1) {
int extra;
count += dlPtr->height;
extra = dlPtr->y + dlPtr->height - dInfoPtr->maxY;
if (extra > 0) {
/*
* This much of the last line is not visible, so don't count
* these pixels. Since we've reached the bottom of the window,
* we break out of the loop.
*/
count -= extra;
break;
}
if (dlPtr->nextPtr == NULL) {
break;
}
dlPtr = dlPtr->nextPtr;
}
if (count > totalPixels) {
/*
* It can be possible, if we do not update each line's pixelHeight
* cache when we lay out individual DLines that the count
* generated here is more up-to-date than that maintained by the
* BTree. In such a case, the best we can do here is to fix up
* 'count' and continue, which might result in small, temporary
* perturbations to the size of the scrollbar. This is basically
* harmless, but in a perfect world we would not have this
* problem.
*
* For debugging purposes, if anyone wishes to improve the text
* widget further, the following 'panic' can be activated. In
* principle it should be possible to ensure the BTree is always
* at least as up to date as the display, so in the future we
* might be able to leave the 'panic' in permanently when we
* believe we have resolved the cache synchronisation issue.
*
* However, to achieve that goal would, I think, require a fairly
* substantial refactorisation of the code in this file so that
* there is much more obvious and explicit coordination between
* calls to LayoutDLine and updating of each TkTextLine's
* pixelHeight. The complicated bit is that LayoutDLine deals with
* individual display lines, but pixelHeight is for a logical
* line.
*/
#if 0
Tcl_Panic("Counted more pixels (%d) than expected (%d) total "
"pixels in text widget scroll bar calculation.", count,
totalPixels);
#endif
count = totalPixels;
}
last = ((double) count)/((double)totalPixels);
}
if (!report) {
listObj = Tcl_NewListObj(0,NULL);
Tcl_ListObjAppendElement(interp, listObj, Tcl_NewDoubleObj(first));
Tcl_ListObjAppendElement(interp, listObj, Tcl_NewDoubleObj(last));
Tcl_SetObjResult(interp, listObj);
return;
}
if (FP_EQUAL_SCALE(first, dInfoPtr->yScrollFirst, totalPixels) &&
FP_EQUAL_SCALE(last, dInfoPtr->yScrollLast, totalPixels)) {
return;
}
dInfoPtr->yScrollFirst = first;
dInfoPtr->yScrollLast = last;
if (textPtr->yScrollCmd != NULL) {
char buf1[TCL_DOUBLE_SPACE+1];
char buf2[TCL_DOUBLE_SPACE+1];
buf1[0] = ' ';
buf2[0] = ' ';
Tcl_PrintDouble(NULL, first, buf1+1);
Tcl_PrintDouble(NULL, last, buf2+1);
code = Tcl_VarEval(interp, textPtr->yScrollCmd, buf1, buf2, NULL);
if (code != TCL_OK) {
Tcl_AddErrorInfo(interp,
"\n (vertical scrolling command executed by text)");
Tcl_BackgroundError(interp);
}
}
}
/*
*----------------------------------------------------------------------
*
* AsyncUpdateYScrollbar --
*
* This function is called to update the vertical scrollbar asychronously
* as the pixel height calculations progress for lines in the widget.
*
* Results:
* None.
*
* Side effects:
* See 'GetYView'. In particular the scrollbar position and size may be
* changed.
*
*----------------------------------------------------------------------
*/
static void
AsyncUpdateYScrollbar(
ClientData clientData) /* Information about widget. */
{
register TkText *textPtr = (TkText *) clientData;
textPtr->dInfoPtr->scrollbarTimer = NULL;
if (!(textPtr->flags & DESTROYED)) {
GetYView(textPtr->interp, textPtr, 1);
}
if (--textPtr->refCount == 0) {
ckfree((char *) textPtr);
}
}
/*
*----------------------------------------------------------------------
*
* FindDLine --
*
* This function is called to find the DLine corresponding to a given
* text index.
*
* Results:
* The return value is a pointer to the first DLine found in the list
* headed by dlPtr that displays information at or after the specified
* position. If there is no such line in the list then NULL is returned.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static DLine *
FindDLine(
TkText *textPtr, /* Widget record for text widget. */
register DLine *dlPtr, /* Pointer to first in list of DLines to
* search. */
CONST TkTextIndex *indexPtr)/* Index of desired character. */
{
DLine *dlPtrPrev;
TkTextIndex indexPtr2;
if (dlPtr == NULL) {
return NULL;
}
if (TkBTreeLinesTo(NULL, indexPtr->linePtr)
< TkBTreeLinesTo(NULL, dlPtr->index.linePtr)) {
/*
* The first display line is already past the desired line.
*/
return dlPtr;
}
/*
* The display line containing the desired index is such that the index
* of the first character of this display line is at or before the
* desired index, and the index of the first character of the next
* display line is after the desired index.
*/
while (TkTextIndexCmp(&dlPtr->index,indexPtr) < 0) {
dlPtrPrev = dlPtr;
dlPtr = dlPtr->nextPtr;
if (dlPtr == NULL) {
/*
* We're past the last display line, either because the desired
* index lies past the visible text, or because the desired index
* is on the last display line showing the last logical line.
*/
indexPtr2 = dlPtrPrev->index;
TkTextFindDisplayLineEnd(textPtr, &indexPtr2, 1, NULL);
if (TkTextIndexCmp(&indexPtr2,indexPtr) >= 0) {
dlPtr = dlPtrPrev;
break;
} else {
return NULL;
}
}
if (TkTextIndexCmp(&dlPtr->index,indexPtr) > 0) {
dlPtr = dlPtrPrev;
break;
}
}
return dlPtr;
}
/*
*----------------------------------------------------------------------
*
* TkTextPixelIndex --
*
* Given an (x,y) coordinate on the screen, find the location of the
* character closest to that location.
*
* Results:
* The index at *indexPtr is modified to refer to the character on the
* display that is closest to (x,y).
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkTextPixelIndex(
TkText *textPtr, /* Widget record for text widget. */
int x, int y, /* Pixel coordinates of point in widget's
* window. */
TkTextIndex *indexPtr, /* This index gets filled in with the index of
* the character nearest to (x,y). */
int *nearest) /* If non-NULL then gets set to 0 if (x,y) is
* actually over the returned index, and 1 if
* it is just nearby (e.g. if x,y is on the
* border of the widget). */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
register DLine *dlPtr, *validDlPtr;
int nearby = 0;
/*
* Make sure that all of the layout information about what's displayed
* where on the screen is up-to-date.
*/
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
/*
* If the coordinates are above the top of the window, then adjust them to
* refer to the upper-right corner of the window. If they're off to one
* side or the other, then adjust to the closest side.
*/
if (y < dInfoPtr->y) {
y = dInfoPtr->y;
x = dInfoPtr->x;
nearby = 1;
}
if (x >= dInfoPtr->maxX) {
x = dInfoPtr->maxX - 1;
nearby = 1;
}
if (x < dInfoPtr->x) {
x = dInfoPtr->x;
nearby = 1;
}
/*
* Find the display line containing the desired y-coordinate.
*/
if (dInfoPtr->dLinePtr == NULL) {
if (nearest != NULL) {
*nearest = 1;
}
*indexPtr = textPtr->topIndex;
return;
} else {
for (dlPtr = validDlPtr = dInfoPtr->dLinePtr;
y >= (dlPtr->y + dlPtr->height);
dlPtr = dlPtr->nextPtr) {
if (dlPtr->chunkPtr != NULL) {
validDlPtr = dlPtr;
}
if (dlPtr->nextPtr == NULL) {
/*
* Y-coordinate is off the bottom of the displayed text. Use
* the last character on the last line.
*/
x = dInfoPtr->maxX - 1;
nearby = 1;
break;
}
}
if (dlPtr->chunkPtr == NULL) dlPtr = validDlPtr;
}
if (nearest != NULL) {
*nearest = nearby;
}
DlineIndexOfX(textPtr, dlPtr, x, indexPtr);
}
/*
*----------------------------------------------------------------------
*
* DlineIndexOfX --
*
* Given an x coordinate in a display line, find the index of the
* character closest to that location.
*
* This is effectively the opposite of DlineXOfIndex.
*
* Results:
* The index at *indexPtr is modified to refer to the character on the
* display line that is closest to x.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
DlineIndexOfX(
TkText *textPtr, /* Widget record for text widget. */
DLine *dlPtr, /* Display information for this display
* line. */
int x, /* Pixel x coordinate of point in widget's
* window. */
TkTextIndex *indexPtr) /* This index gets filled in with the index of
* the character nearest to x. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
register TkTextDispChunk *chunkPtr;
/*
* Scan through the line's chunks to find the one that contains the
* desired x-coordinate. Before doing this, translate the x-coordinate
* from the coordinate system of the window to the coordinate system of
* the line (to take account of x-scrolling).
*/
*indexPtr = dlPtr->index;
x = x - dInfoPtr->x + dInfoPtr->curXPixelOffset;
chunkPtr = dlPtr->chunkPtr;
if (chunkPtr == NULL || x == 0) {
/*
* This may occur if everything is elided, or if we're simply already
* at the beginning of the line.
*/
return;
}
while (x >= (chunkPtr->x + chunkPtr->width)) {
/*
* Note that this forward then backward movement of the index can be
* problematic at the end of the buffer (we can't move forward, and
* then when we move backward, we do, leading to the wrong position).
* Hence when x == 0 we take special action above.
*/
if (TkTextIndexForwBytes(NULL,indexPtr,chunkPtr->numBytes,indexPtr)) {
/*
* We've reached the end of the text.
*/
return;
}
if (chunkPtr->nextPtr == NULL) {
TkTextIndexBackChars(NULL, indexPtr, 1, indexPtr, COUNT_INDICES);
return;
}
chunkPtr = chunkPtr->nextPtr;
}
/*
* If the chunk has more than one byte in it, ask it which character is at
* the desired location. In this case we can manipulate
* 'indexPtr->byteIndex' directly, because we know we're staying inside a
* single logical line.
*/
if (chunkPtr->numBytes > 1) {
indexPtr->byteIndex += (*chunkPtr->measureProc)(chunkPtr, x);
}
}
/*
*----------------------------------------------------------------------
*
* TkTextIndexOfX --
*
* Given a logical x coordinate (i.e. distance in pixels from the
* beginning of the display line, not taking into account any information
* about the window, scrolling etc.) on the display line starting with
* the given index, adjust that index to refer to the object under the x
* coordinate.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkTextIndexOfX(
TkText *textPtr, /* Widget record for text widget. */
int x, /* The x coordinate for which we want the
* index. */
TkTextIndex *indexPtr) /* Index of display line start, which will be
* adjusted to the index under the given x
* coordinate. */
{
DLine *dlPtr = LayoutDLine(textPtr, indexPtr);
DlineIndexOfX(textPtr, dlPtr, x + textPtr->dInfoPtr->x
- textPtr->dInfoPtr->curXPixelOffset, indexPtr);
FreeDLines(textPtr, dlPtr, NULL, DLINE_FREE_TEMP);
}
/*
*----------------------------------------------------------------------
*
* DlineXOfIndex --
*
* Given a relative byte index on a given display line (i.e. the number
* of byte indices from the beginning of the given display line), find
* the x coordinate of that index within the abstract display line,
* without adjusting for the x-scroll state of the line.
*
* This is effectively the opposite of DlineIndexOfX.
*
* NB. The 'byteIndex' is relative to the display line, NOT the logical
* line.
*
* Results:
* The x coordinate.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
DlineXOfIndex(
TkText *textPtr, /* Widget record for text widget. */
DLine *dlPtr, /* Display information for this display
* line. */
int byteIndex) /* The byte index for which we want the
* coordinate. */
{
register TkTextDispChunk *chunkPtr = dlPtr->chunkPtr;
int x;
if (byteIndex == 0 || chunkPtr == NULL) {
return 0;
}
/*
* Scan through the line's chunks to find the one that contains the
* desired byte index.
*/
chunkPtr = dlPtr->chunkPtr;
while (byteIndex > 0) {
if (byteIndex < chunkPtr->numBytes) {
int y, width, height;
(*chunkPtr->bboxProc)(textPtr, chunkPtr, byteIndex,
dlPtr->y + dlPtr->spaceAbove,
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
dlPtr->baseline - dlPtr->spaceAbove, &x, &y, &width,
&height);
break;
} else {
byteIndex -= chunkPtr->numBytes;
}
if (chunkPtr->nextPtr == NULL || byteIndex == 0) {
x = chunkPtr->x + chunkPtr->width;
break;
}
chunkPtr = chunkPtr->nextPtr;
}
return x;
}
/*
*----------------------------------------------------------------------
*
* TkTextIndexBbox --
*
* Given an index, find the bounding box of the screen area occupied by
* the entity (character, window, image) at that index.
*
* Results:
* Zero is returned if the index is on the screen. -1 means the index is
* not on the screen. If the return value is 0, then the bounding box of
* the part of the index that's visible on the screen is returned to
* *xPtr, *yPtr, *widthPtr, and *heightPtr.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkTextIndexBbox(
TkText *textPtr, /* Widget record for text widget. */
CONST TkTextIndex *indexPtr,/* Index whose bounding box is desired. */
int *xPtr, int *yPtr, /* Filled with index's upper-left
* coordinate. */
int *widthPtr, int *heightPtr,
/* Filled in with index's dimensions. */
int *charWidthPtr) /* If the 'index' is at the end of a display
* line and therefore takes up a very large
* width, this is used to return the smaller
* width actually desired by the index. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
DLine *dlPtr;
register TkTextDispChunk *chunkPtr;
int byteCount;
/*
* Make sure that all of the screen layout information is up to date.
*/
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
/*
* Find the display line containing the desired index.
*/
dlPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, indexPtr);
/*
* Two cases shall be trapped here because the logic later really
* needs dlPtr to be the display line containing indexPtr:
* 1. if no display line contains the desired index (NULL dlPtr)
* 2. if indexPtr is before the first display line, in which case
* dlPtr currently points to the first display line
*/
if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) {
return -1;
}
/*
* Find the chunk within the display line that contains the desired
* index. The chunks making the display line are skipped up to but not
* including the one crossing indexPtr. Skipping is done based on
* a byteCount offset possibly spanning several logical lines in case
* they are elided.
*/
byteCount = TkTextIndexCount(textPtr, &dlPtr->index, indexPtr,
COUNT_INDICES);
for (chunkPtr = dlPtr->chunkPtr; ; chunkPtr = chunkPtr->nextPtr) {
if (chunkPtr == NULL) {
return -1;
}
if (byteCount < chunkPtr->numBytes) {
break;
}
byteCount -= chunkPtr->numBytes;
}
/*
* Call a chunk-specific function to find the horizontal range of the
* character within the chunk, then fill in the vertical range. The
* x-coordinate returned by bboxProc is a coordinate within a line, not a
* coordinate on the screen. Translate it to reflect horizontal scrolling.
*/
(*chunkPtr->bboxProc)(textPtr, chunkPtr, byteCount,
dlPtr->y + dlPtr->spaceAbove,
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
dlPtr->baseline - dlPtr->spaceAbove, xPtr, yPtr, widthPtr,
heightPtr);
*xPtr = *xPtr + dInfoPtr->x - dInfoPtr->curXPixelOffset;
if ((byteCount == chunkPtr->numBytes-1) && (chunkPtr->nextPtr == NULL)) {
/*
* Last character in display line. Give it all the space up to the
* line.
*/
if (charWidthPtr != NULL) {
*charWidthPtr = dInfoPtr->maxX - *xPtr;
if (*charWidthPtr > textPtr->charWidth) {
*charWidthPtr = textPtr->charWidth;
}
}
if (*xPtr > dInfoPtr->maxX) {
*xPtr = dInfoPtr->maxX;
}
*widthPtr = dInfoPtr->maxX - *xPtr;
} else {
if (charWidthPtr != NULL) {
*charWidthPtr = *widthPtr;
}
}
if (*widthPtr == 0) {
/*
* With zero width (e.g. elided text) we just need to make sure it is
* onscreen, where the '=' case here is ok.
*/
if (*xPtr < dInfoPtr->x) {
return -1;
}
} else {
if ((*xPtr + *widthPtr) <= dInfoPtr->x) {
return -1;
}
}
if ((*xPtr + *widthPtr) > dInfoPtr->maxX) {
*widthPtr = dInfoPtr->maxX - *xPtr;
if (*widthPtr <= 0) {
return -1;
}
}
if ((*yPtr + *heightPtr) > dInfoPtr->maxY) {
*heightPtr = dInfoPtr->maxY - *yPtr;
if (*heightPtr <= 0) {
return -1;
}
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* TkTextDLineInfo --
*
* Given an index, return information about the display line containing
* that character.
*
* Results:
* Zero is returned if the character is on the screen. -1 means the
* character isn't on the screen. If the return value is 0, then
* information is returned in the variables pointed to by xPtr, yPtr,
* widthPtr, heightPtr, and basePtr.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkTextDLineInfo(
TkText *textPtr, /* Widget record for text widget. */
CONST TkTextIndex *indexPtr,/* Index of character whose bounding box is
* desired. */
int *xPtr, int *yPtr, /* Filled with line's upper-left
* coordinate. */
int *widthPtr, int *heightPtr,
/* Filled in with line's dimensions. */
int *basePtr) /* Filled in with the baseline position,
* measured as an offset down from *yPtr. */
{
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
DLine *dlPtr;
int dlx;
/*
* Make sure that all of the screen layout information is up to date.
*/
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
UpdateDisplayInfo(textPtr);
}
/*
* Find the display line containing the desired index.
*/
dlPtr = FindDLine(textPtr, dInfoPtr->dLinePtr, indexPtr);
/*
* Two cases shall be trapped here because the logic later really
* needs dlPtr to be the display line containing indexPtr:
* 1. if no display line contains the desired index (NULL dlPtr)
* 2. if indexPtr is before the first display line, in which case
* dlPtr currently points to the first display line
*/
if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) {
return -1;
}
dlx = (dlPtr->chunkPtr != NULL? dlPtr->chunkPtr->x: 0);
*xPtr = dInfoPtr->x - dInfoPtr->curXPixelOffset + dlx;
*widthPtr = dlPtr->length - dlx;
*yPtr = dlPtr->y;
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
*heightPtr = dInfoPtr->maxY - dlPtr->y;
} else {
*heightPtr = dlPtr->height;
}
*basePtr = dlPtr->baseline;
return 0;
}
/*
* Get bounding-box information about an elided chunk.
*/
static void
ElideBboxProc(
TkText *textPtr,
TkTextDispChunk *chunkPtr, /* Chunk containing desired char. */
int index, /* Index of desired character within the
* chunk. */
int y, /* Topmost pixel in area allocated for this
* line. */
int lineHeight, /* Height of line, in pixels. */
int baseline, /* Location of line's baseline, in pixels
* measured down from y. */
int *xPtr, int *yPtr, /* Gets filled in with coords of character's
* upper-left pixel. X-coord is in same
* coordinate system as chunkPtr->x. */
int *widthPtr, /* Gets filled in with width of character, in
* pixels. */
int *heightPtr) /* Gets filled in with height of character, in
* pixels. */
{
*xPtr = chunkPtr->x;
*yPtr = y;
*widthPtr = *heightPtr = 0;
}
/*
* Measure an elided chunk.
*/
static int
ElideMeasureProc(
TkTextDispChunk *chunkPtr, /* Chunk containing desired coord. */
int x) /* X-coordinate, in same coordinate system as
* chunkPtr->x. */
{
return 0 /*chunkPtr->numBytes - 1*/;
}
/*
*--------------------------------------------------------------
*
* TkTextCharLayoutProc --
*
* This function is the "layoutProc" for character segments.
*
* Results:
* If there is something to display for the chunk then a non-zero value
* is returned and the fields of chunkPtr will be filled in (see the
* declaration of TkTextDispChunk in tkText.h for details). If zero is
* returned it means that no characters from this chunk fit in the
* window. If -1 is returned it means that this segment just doesn't need
* to be displayed (never happens for text).
*
* Side effects:
* Memory is allocated to hold additional information about the chunk.
*
*--------------------------------------------------------------
*/
int
TkTextCharLayoutProc(
TkText *textPtr, /* Text widget being layed out. */
TkTextIndex *indexPtr, /* Index of first character to lay out
* (corresponds to segPtr and offset). */
TkTextSegment *segPtr, /* Segment being layed out. */
int byteOffset, /* Byte offset within segment of first
* character to consider. */
int maxX, /* Chunk must not occupy pixels at this
* position or higher. */
int maxBytes, /* Chunk must not include more than this many
* characters. */
int noCharsYet, /* Non-zero means no characters have been
* assigned to this display line yet. */
TkWrapMode wrapMode, /* How to handle line wrapping:
* TEXT_WRAPMODE_CHAR, TEXT_WRAPMODE_NONE, or
* TEXT_WRAPMODE_WORD. */
register TkTextDispChunk *chunkPtr)
/* Structure to fill in with information about
* this chunk. The x field has already been
* set by the caller. */
{
Tk_Font tkfont;
int nextX, bytesThatFit, count;
CharInfo *ciPtr;
char *p;
TkTextSegment *nextPtr;
Tk_FontMetrics fm;
#if TK_LAYOUT_WITH_BASE_CHUNKS
const char *line;
int lineOffset;
BaseCharInfo *bciPtr;
Tcl_DString *baseString;
#endif
/*
* Figure out how many characters will fit in the space we've got. Include
* the next character, even though it won't fit completely, if any of the
* following is true:
* (a) the chunk contains no characters and the display line contains no
* characters yet (i.e. the line isn't wide enough to hold even a
* single character).
* (b) at least one pixel of the character is visible, we have not
* already exceeded the character limit, and the next character is a
* white space character.
*/
p = segPtr->body.chars + byteOffset;
tkfont = chunkPtr->stylePtr->sValuePtr->tkfont;
#if TK_LAYOUT_WITH_BASE_CHUNKS
if (baseCharChunkPtr == NULL) {
baseCharChunkPtr = chunkPtr;
bciPtr = (BaseCharInfo *) ckalloc(sizeof(BaseCharInfo));
baseString = &bciPtr->baseChars;
Tcl_DStringInit(baseString);
bciPtr->width = 0;
ciPtr = &bciPtr->ci;
} else {
bciPtr = (BaseCharInfo *) baseCharChunkPtr->clientData;
ciPtr = (CharInfo *) ckalloc(sizeof(CharInfo));
baseString = &bciPtr->baseChars;
}
lineOffset = Tcl_DStringLength(baseString);
line = Tcl_DStringAppend(baseString,p,maxBytes);
chunkPtr->clientData = (ClientData) ciPtr;
ciPtr->baseChunkPtr = baseCharChunkPtr;
ciPtr->baseOffset = lineOffset;
ciPtr->chars = NULL;
ciPtr->numBytes = 0;
bytesThatFit = CharChunkMeasureChars(chunkPtr, line,
lineOffset + maxBytes, lineOffset, -1, chunkPtr->x, maxX,
TK_ISOLATE_END, &nextX);
#else /* !TK_LAYOUT_WITH_BASE_CHUNKS */
bytesThatFit = CharChunkMeasureChars(chunkPtr, p, maxBytes, 0, -1,
chunkPtr->x, maxX, TK_ISOLATE_END, &nextX);
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
if (bytesThatFit < maxBytes) {
if ((bytesThatFit == 0) && noCharsYet) {
Tcl_UniChar ch;
int chLen = Tcl_UtfToUniChar(p, &ch);
#if TK_LAYOUT_WITH_BASE_CHUNKS
bytesThatFit = CharChunkMeasureChars(chunkPtr, line,
lineOffset+chLen, lineOffset, -1, chunkPtr->x, -1, 0,
&nextX);
#else /* !TK_LAYOUT_WITH_BASE_CHUNKS */
bytesThatFit = CharChunkMeasureChars(chunkPtr, p, chLen, 0, -1,
chunkPtr->x, -1, 0, &nextX);
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
}
if ((nextX < maxX) && ((p[bytesThatFit] == ' ')
|| (p[bytesThatFit] == '\t'))) {
/*
* Space characters are funny, in that they are considered to fit
* if there is at least one pixel of space left on the line. Just
* give the space character whatever space is left.
*/
nextX = maxX;
bytesThatFit++;
}
if (p[bytesThatFit] == '\n') {
/*
* A newline character takes up no space, so if the previous
* character fits then so does the newline.
*/
bytesThatFit++;
}
if (bytesThatFit == 0) {
#if TK_LAYOUT_WITH_BASE_CHUNKS
chunkPtr->clientData = NULL;
if (chunkPtr == baseCharChunkPtr) {
baseCharChunkPtr = NULL;
Tcl_DStringFree(baseString);
} else {
Tcl_DStringSetLength(baseString,lineOffset);
}
ckfree((char *) ciPtr);
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
return 0;
}
}
Tk_GetFontMetrics(tkfont, &fm);
/*
* Fill in the chunk structure and allocate and initialize a CharInfo
* structure. If the last character is a newline then don't bother to
* display it.
*/
chunkPtr->displayProc = CharDisplayProc;
chunkPtr->undisplayProc = CharUndisplayProc;
chunkPtr->measureProc = CharMeasureProc;
chunkPtr->bboxProc = CharBboxProc;
chunkPtr->numBytes = bytesThatFit;
chunkPtr->minAscent = fm.ascent + chunkPtr->stylePtr->sValuePtr->offset;
chunkPtr->minDescent = fm.descent - chunkPtr->stylePtr->sValuePtr->offset;
chunkPtr->minHeight = 0;
chunkPtr->width = nextX - chunkPtr->x;
chunkPtr->breakIndex = -1;
#if !TK_LAYOUT_WITH_BASE_CHUNKS
ciPtr = (CharInfo *)
ckalloc((unsigned) bytesThatFit + Tk_Offset(CharInfo, chars) + 1);
chunkPtr->clientData = (ClientData) ciPtr;
memcpy(ciPtr->chars, p, (unsigned) bytesThatFit);
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
ciPtr->numBytes = bytesThatFit;
if (p[bytesThatFit - 1] == '\n') {
ciPtr->numBytes--;
}
#if TK_LAYOUT_WITH_BASE_CHUNKS
/*
* Final update for the current base chunk data.
*/
Tcl_DStringSetLength(baseString,lineOffset+ciPtr->numBytes);
bciPtr->width = nextX - baseCharChunkPtr->x;
/*
* Finalize the base chunk if this chunk ends in a tab, which definitly
* breaks the context and needs to be handled on a higher level.
*/
if (ciPtr->numBytes > 0 && p[ciPtr->numBytes - 1] == '\t') {
FinalizeBaseChunk(chunkPtr);
}
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
/*
* Compute a break location. If we're in word wrap mode, a break can occur
* after any space character, or at the end of the chunk if the next
* segment (ignoring those with zero size) is not a character segment.
*/
if (wrapMode != TEXT_WRAPMODE_WORD) {
chunkPtr->breakIndex = chunkPtr->numBytes;
} else {
for (count = bytesThatFit, p += bytesThatFit - 1; count > 0;
count--, p--) {
if (UCHAR(*p) < 0x80 && isspace(UCHAR(*p))) {
chunkPtr->breakIndex = count;
break;
}
}
if ((bytesThatFit + byteOffset) == segPtr->size) {
for (nextPtr = segPtr->nextPtr; nextPtr != NULL;
nextPtr = nextPtr->nextPtr) {
if (nextPtr->size != 0) {
if (nextPtr->typePtr != &tkTextCharType) {
chunkPtr->breakIndex = chunkPtr->numBytes;
}
break;
}
}
}
}
return 1;
}
/*
*---------------------------------------------------------------------------
*
* CharChunkMeasureChars --
*
* Determine the number of characters from a char chunk that will fit in
* the given horizontal span.
*
* This is the same as MeasureChars (which see), but in the context of a
* char chunk, i.e. on a higher level of abstraction. Use this function
* whereever possible instead of plain MeasureChars, so that the right
* context is used automatically.
*
* Results:
* The return value is the number of bytes from the range of start to end
* in source that fit in the span given by startX and maxX. *nextXPtr is
* filled in with the x-coordinate at which the first character that
* didn't fit would be drawn, if it were to be drawn.
*
* Side effects:
* None.
*--------------------------------------------------------------
*/
static int
CharChunkMeasureChars(
TkTextDispChunk *chunkPtr, /* Chunk from which to measure. */
const char *chars, /* Chars to use, instead of the chunk's own.
* Used by the layoutproc during chunk setup.
* All other callers use NULL. Not
* NUL-terminated. */
int charsLen, /* Length of the "chars" parameter. */
int start, int end, /* The range of chars to measure inside the
* chunk (or inside the additional chars). */
int startX, /* Starting x coordinate where the measured
* span will begin. */
int maxX, /* Maximum pixel width of the span. May be -1
* for unlimited. */
int flags, /* Flags to pass to MeasureChars. */
int *nextXPtr) /* The function puts the newly calculated
* right border x-position of the span
* here. */
{
Tk_Font tkfont = chunkPtr->stylePtr->sValuePtr->tkfont;
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
#if !TK_LAYOUT_WITH_BASE_CHUNKS
if (chars == NULL) {
chars = ciPtr->chars;
charsLen = ciPtr->numBytes;
}
if (end == -1) {
end = charsLen;
}
return MeasureChars(tkfont, chars, charsLen, start, end-start,
startX, maxX, flags, nextXPtr);
#else
{
int xDisplacement;
int fit, bstart = start, bend = end;
if (chars == NULL) {
Tcl_DString *baseChars = &((BaseCharInfo *)
ciPtr->baseChunkPtr->clientData)->baseChars;
chars = Tcl_DStringValue(baseChars);
charsLen = Tcl_DStringLength(baseChars);
bstart += ciPtr->baseOffset;
if (bend == -1) {
bend = ciPtr->baseOffset + ciPtr->numBytes;
} else {
bend += ciPtr->baseOffset;
}
} else if (bend == -1) {
bend = charsLen;
}
if (bstart == ciPtr->baseOffset) {
xDisplacement = startX - chunkPtr->x;
} else {
int widthUntilStart = 0;
MeasureChars(tkfont, chars, charsLen, 0, bstart,
0, -1, 0, &widthUntilStart);
xDisplacement = startX - widthUntilStart - chunkPtr->x;
}
fit = MeasureChars(tkfont, chars, charsLen, 0, bend,
ciPtr->baseChunkPtr->x + xDisplacement, maxX, flags, nextXPtr);
if (fit < bstart) {
return 0;
} else {
return fit - bstart;
}
}
#endif
}
/*
*--------------------------------------------------------------
*
* CharDisplayProc --
*
* This function is called to display a character chunk on the screen or
* in an off-screen pixmap.
*
* Results:
* None.
*
* Side effects:
* Graphics are drawn.
*
*--------------------------------------------------------------
*/
static void
CharDisplayProc(
TkText *textPtr,
TkTextDispChunk *chunkPtr, /* Chunk that is to be drawn. */
int x, /* X-position in dst at which to draw this
* chunk (may differ from the x-position in
* the chunk because of scrolling). */
int y, /* Y-position at which to draw this chunk in
* dst. */
int height, /* Total height of line. */
int baseline, /* Offset of baseline from y. */
Display *display, /* Display to use for drawing. */
Drawable dst, /* Pixmap or window in which to draw chunk. */
int screenY) /* Y-coordinate in text window that
* corresponds to y. */
{
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
const char *string;
TextStyle *stylePtr;
StyleValues *sValuePtr;
int numBytes, offsetBytes, offsetX;
#if TK_DRAW_IN_CONTEXT
BaseCharInfo *bciPtr;
#endif /* TK_DRAW_IN_CONTEXT */
if ((x + chunkPtr->width) <= 0) {
/*
* The chunk is off-screen.
*/
return;
}
#if TK_DRAW_IN_CONTEXT
bciPtr = (BaseCharInfo *) ciPtr->baseChunkPtr->clientData;
numBytes = Tcl_DStringLength(&bciPtr->baseChars);
string = Tcl_DStringValue(&bciPtr->baseChars);
#elif TK_LAYOUT_WITH_BASE_CHUNKS
if (ciPtr->baseChunkPtr != chunkPtr) {
/*
* Without context drawing only base chunks display their foreground.
*/
return;
}
numBytes = Tcl_DStringLength(&((BaseCharInfo *) ciPtr)->baseChars);
string = ciPtr->chars;
#else /* !TK_LAYOUT_WITH_BASE_CHUNKS */
numBytes = ciPtr->numBytes;
string = ciPtr->chars;
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
stylePtr = chunkPtr->stylePtr;
sValuePtr = stylePtr->sValuePtr;
/*
* If the text sticks out way to the left of the window, skip over the
* characters that aren't in the visible part of the window. This is
* essential if x is very negative (such as less than 32K); otherwise
* overflow problems will occur in servers that use 16-bit arithmetic,
* like X.
*/
offsetX = x;
offsetBytes = 0;
if (x < 0) {
offsetBytes = CharChunkMeasureChars(chunkPtr, NULL, 0, 0, -1,
x, 0, 0, &offsetX);
}
/*
* Draw the text, underline, and overstrike for this chunk.
*/
if (!sValuePtr->elide && (numBytes > offsetBytes)
&& (stylePtr->fgGC != None)) {
#if TK_DRAW_IN_CONTEXT
int start = ciPtr->baseOffset + offsetBytes;
int len = ciPtr->numBytes - offsetBytes;
int xDisplacement = x - chunkPtr->x;
if ((len > 0) && (string[start + len - 1] == '\t')) {
len--;
}
if (len <= 0) {
return;
}
TkpDrawCharsInContext(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
string, numBytes, start, len,
ciPtr->baseChunkPtr->x + xDisplacement,
y + baseline - sValuePtr->offset);
if (sValuePtr->underline) {
TkUnderlineCharsInContext(display, dst, stylePtr->fgGC,
sValuePtr->tkfont, string, numBytes,
ciPtr->baseChunkPtr->x + xDisplacement,
y + baseline - sValuePtr->offset,
start, start+len);
}
if (sValuePtr->overstrike) {
Tk_FontMetrics fm;
Tk_GetFontMetrics(sValuePtr->tkfont, &fm);
TkUnderlineCharsInContext(display, dst, stylePtr->fgGC,
sValuePtr->tkfont, string, numBytes,
ciPtr->baseChunkPtr->x + xDisplacement,
y + baseline - sValuePtr->offset
- fm.descent - (fm.ascent * 3) / 10,
start, start+len);
}
#else /* !TK_DRAW_IN_CONTEXT */
string += offsetBytes;
numBytes -= offsetBytes;
if ((numBytes > 0) && (string[numBytes - 1] == '\t')) {
numBytes--;
}
Tk_DrawChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont, string,
numBytes, offsetX, y + baseline - sValuePtr->offset);
if (sValuePtr->underline) {
Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
string, offsetX,
y + baseline - sValuePtr->offset,
0, numBytes);
}
if (sValuePtr->overstrike) {
Tk_FontMetrics fm;
Tk_GetFontMetrics(sValuePtr->tkfont, &fm);
Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
string, offsetX,
y + baseline - sValuePtr->offset
- fm.descent - (fm.ascent * 3) / 10,
0, numBytes);
}
#endif /* TK_DRAW_IN_CONTEXT */
}
}
/*
*--------------------------------------------------------------
*
* CharUndisplayProc --
*
* This function is called when a character chunk is no longer going to
* be displayed. It frees up resources that were allocated to display the
* chunk.
*
* Results:
* None.
*
* Side effects:
* Memory and other resources get freed.
*
*--------------------------------------------------------------
*/
static void
CharUndisplayProc(
TkText *textPtr, /* Overall information about text widget. */
TkTextDispChunk *chunkPtr) /* Chunk that is about to be freed. */
{
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
if (ciPtr) {
#if TK_LAYOUT_WITH_BASE_CHUNKS
if (chunkPtr == ciPtr->baseChunkPtr) {
/*
* Basechunks are undisplayed first, when DLines are freed or
* partially freed, so this makes sure we don't access their data
* any more.
*/
FreeBaseChunk(chunkPtr);
} else if (ciPtr->baseChunkPtr != NULL) {
/*
* When other char chunks are undisplayed, drop their characters
* from the base chunk. This usually happens, when they are last
* in a line and need to be re-layed out.
*/
RemoveFromBaseChunk(chunkPtr);
}
ciPtr->baseChunkPtr = NULL;
ciPtr->chars = NULL;
ciPtr->numBytes = 0;
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
ckfree((char *) ciPtr);
chunkPtr->clientData = NULL;
}
}
/*
*--------------------------------------------------------------
*
* CharMeasureProc --
*
* This function is called to determine which character in a character
* chunk lies over a given x-coordinate.
*
* Results:
* The return value is the index *within the chunk* of the character that
* covers the position given by "x".
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
CharMeasureProc(
TkTextDispChunk *chunkPtr, /* Chunk containing desired coord. */
int x) /* X-coordinate, in same coordinate system as
* chunkPtr->x. */
{
int endX;
return CharChunkMeasureChars(chunkPtr, NULL, 0, 0, chunkPtr->numBytes-1,
chunkPtr->x, x, 0, &endX); /* CHAR OFFSET */
}
/*
*--------------------------------------------------------------
*
* CharBboxProc --
*
* This function is called to compute the bounding box of the area
* occupied by a single character.
*
* Results:
* There is no return value. *xPtr and *yPtr are filled in with the
* coordinates of the upper left corner of the character, and *widthPtr
* and *heightPtr are filled in with the dimensions of the character in
* pixels. Note: not all of the returned bbox is necessarily visible on
* the screen (the rightmost part might be off-screen to the right, and
* the bottommost part might be off-screen to the bottom).
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
CharBboxProc(
TkText *textPtr,
TkTextDispChunk *chunkPtr, /* Chunk containing desired char. */
int byteIndex, /* Byte offset of desired character within the
* chunk. */
int y, /* Topmost pixel in area allocated for this
* line. */
int lineHeight, /* Height of line, in pixels. */
int baseline, /* Location of line's baseline, in pixels
* measured down from y. */
int *xPtr, int *yPtr, /* Gets filled in with coords of character's
* upper-left pixel. X-coord is in same
* coordinate system as chunkPtr->x. */
int *widthPtr, /* Gets filled in with width of character, in
* pixels. */
int *heightPtr) /* Gets filled in with height of character, in
* pixels. */
{
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
int maxX;
maxX = chunkPtr->width + chunkPtr->x;
CharChunkMeasureChars(chunkPtr, NULL, 0, 0, byteIndex,
chunkPtr->x, -1, 0, xPtr);
if (byteIndex == ciPtr->numBytes) {
/*
* This situation only happens if the last character in a line is a
* space character, in which case it absorbs all of the extra space in
* the line (see TkTextCharLayoutProc).
*/
*widthPtr = maxX - *xPtr;
} else if ((ciPtr->chars[byteIndex] == '\t')
&& (byteIndex == ciPtr->numBytes - 1)) {
/*
* The desired character is a tab character that terminates a chunk;
* give it all the space left in the chunk.
*/
*widthPtr = maxX - *xPtr;
} else {
CharChunkMeasureChars(chunkPtr, NULL, 0, byteIndex, byteIndex+1,
*xPtr, -1, 0, widthPtr);
if (*widthPtr > maxX) {
*widthPtr = maxX - *xPtr;
} else {
*widthPtr -= *xPtr;
}
}
*yPtr = y + baseline - chunkPtr->minAscent;
*heightPtr = chunkPtr->minAscent + chunkPtr->minDescent;
}
/*
*----------------------------------------------------------------------
*
* AdjustForTab --
*
* This function is called to move a series of chunks right in order to
* align them with a tab stop.
*
* Results:
* None.
*
* Side effects:
* The width of chunkPtr gets adjusted so that it absorbs the extra space
* due to the tab. The x locations in all the chunks after chunkPtr are
* adjusted rightward to align with the tab stop given by tabArrayPtr and
* index.
*
*----------------------------------------------------------------------
*/
static void
AdjustForTab(
TkText *textPtr, /* Information about the text widget as a
* whole. */
TkTextTabArray *tabArrayPtr,/* Information about the tab stops that apply
* to this line. May be NULL to indicate
* default tabbing (every 8 chars). */
int index, /* Index of current tab stop. */
TkTextDispChunk *chunkPtr) /* Chunk whose last character is the tab; the
* following chunks contain information to be
* shifted right. */
{
int x, desired, delta, width, decimal, i, gotDigit;
TkTextDispChunk *chunkPtr2, *decimalChunkPtr;
CharInfo *ciPtr;
int tabX, spaceWidth;
const char *p;
TkTextTabAlign alignment;
if (chunkPtr->nextPtr == NULL) {
/*
* Nothing after the actual tab; just return.
*/
return;
}
x = chunkPtr->nextPtr->x;
/*
* If no tab information has been given, assuming tab stops are at 8
* average-sized characters. Still ensure we respect the tabular versus
* wordprocessor tab style.
*/
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
/*
* No tab information has been given, so use the default
* interpretation of tabs.
*/
if (textPtr->tabStyle == TK_TEXT_TABSTYLE_TABULAR) {
int tabWidth = Tk_TextWidth(textPtr->tkfont, "0", 1) * 8;
if (tabWidth == 0) {
tabWidth = 1;
}
desired = tabWidth * (index + 1);
} else {
desired = NextTabStop(textPtr->tkfont, x, 0);
}
goto update;
}
if (index < tabArrayPtr->numTabs) {
alignment = tabArrayPtr->tabs[index].alignment;
tabX = tabArrayPtr->tabs[index].location;
} else {
/*
* Ran out of tab stops; compute a tab position by extrapolating from
* the last two tab positions.
*/
tabX = (int) (tabArrayPtr->lastTab +
(index + 1 - tabArrayPtr->numTabs)*tabArrayPtr->tabIncrement +
0.5);
alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment;
}
if (alignment == LEFT) {
desired = tabX;
goto update;
}
if ((alignment == CENTER) || (alignment == RIGHT)) {
/*
* Compute the width of all the information in the tab group, then use
* it to pick a desired location.
*/
width = 0;
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
chunkPtr2 = chunkPtr2->nextPtr) {
width += chunkPtr2->width;
}
if (alignment == CENTER) {
desired = tabX - width/2;
} else {
desired = tabX - width;
}
goto update;
}
/*
* Must be numeric alignment. Search through the text to be tabbed,
* looking for the last , or . before the first character that isn't a
* number, comma, period, or sign.
*/
decimalChunkPtr = NULL;
decimal = gotDigit = 0;
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
chunkPtr2 = chunkPtr2->nextPtr) {
if (chunkPtr2->displayProc != CharDisplayProc) {
continue;
}
ciPtr = (CharInfo *) chunkPtr2->clientData;
for (p = ciPtr->chars, i = 0; i < ciPtr->numBytes; p++, i++) {
if (isdigit(UCHAR(*p))) {
gotDigit = 1;
} else if ((*p == '.') || (*p == ',')) {
decimal = p-ciPtr->chars;
decimalChunkPtr = chunkPtr2;
} else if (gotDigit) {
if (decimalChunkPtr == NULL) {
decimal = p-ciPtr->chars;
decimalChunkPtr = chunkPtr2;
}
goto endOfNumber;
}
}
}
endOfNumber:
if (decimalChunkPtr != NULL) {
int curX;
ciPtr = (CharInfo *) decimalChunkPtr->clientData;
CharChunkMeasureChars(decimalChunkPtr, NULL, 0, 0, decimal,
decimalChunkPtr->x, -1, 0, &curX);
desired = tabX - (curX - x);
goto update;
} else {
/*
* There wasn't a decimal point. Right justify the text.
*/
width = 0;
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
chunkPtr2 = chunkPtr2->nextPtr) {
width += chunkPtr2->width;
}
desired = tabX - width;
}
/*
* Shift all of the chunks to the right so that the left edge is at the
* desired location, then expand the chunk containing the tab. Be sure
* that the tab occupies at least the width of a space character.
*/
update:
delta = desired - x;
MeasureChars(textPtr->tkfont, " ", 1, 0, 1, 0, -1, 0, &spaceWidth);
if (delta < spaceWidth) {
delta = spaceWidth;
}
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
chunkPtr2 = chunkPtr2->nextPtr) {
chunkPtr2->x += delta;
}
chunkPtr->width += delta;
}
/*
*----------------------------------------------------------------------
*
* SizeOfTab --
*
* This returns an estimate of the amount of white space that will be
* consumed by a tab.
*
* Results:
* The return value is the minimum number of pixels that will be occupied
* by the next tab of tabArrayPtr, assuming that the current position on
* the line is x and the end of the line is maxX. The 'next tab' is
* determined by a combination of the current position (x) which it must
* be equal to or beyond, and the tab count in indexPtr.
*
* For numeric tabs, this is a conservative estimate. The return value is
* always >= 0.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
SizeOfTab(
TkText *textPtr, /* Information about the text widget as a
* whole. */
int tabStyle, /* One of TK_TEXT_TABSTYLE_TABULAR
* or TK_TEXT_TABSTYLE_WORDPROCESSOR. */
TkTextTabArray *tabArrayPtr,/* Information about the tab stops that apply
* to this line. NULL means use default
* tabbing (every 8 chars.) */
int *indexPtr, /* Contains index of previous tab stop, will
* be updated to reflect the number of stops
* used. */
int x, /* Current x-location in line. */
int maxX) /* X-location of pixel just past the right
* edge of the line. */
{
int tabX, result, index, spaceWidth, tabWidth;
TkTextTabAlign alignment;
index = *indexPtr;
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
/*
* We're using a default tab spacing of 8 characters.
*/
tabWidth = Tk_TextWidth(textPtr->tkfont, "0", 1) * 8;
if (tabWidth == 0) {
tabWidth = 1;
}
} else {
tabWidth = 0; /* Avoid compiler error. */
}
do {
/*
* We were given the count before this tab, so increment it first.
*/
index++;
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
/*
* We're using a default tab spacing calculated above.
*/
tabX = tabWidth * (index + 1);
alignment = LEFT;
} else if (index < tabArrayPtr->numTabs) {
tabX = tabArrayPtr->tabs[index].location;
alignment = tabArrayPtr->tabs[index].alignment;
} else {
/*
* Ran out of tab stops; compute a tab position by extrapolating.
*/
tabX = (int) (tabArrayPtr->lastTab
+ (index + 1 - tabArrayPtr->numTabs)
* tabArrayPtr->tabIncrement + 0.5);
alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment;
}
/*
* If this tab stop is before the current x position, then we have two
* cases:
*
* With 'wordprocessor' style tabs, we must obviously continue until
* we reach the text tab stop.
*
* With 'tabular' style tabs, we always use the index'th tab stop.
*/
} while (tabX <= x && (tabStyle == TK_TEXT_TABSTYLE_WORDPROCESSOR));
/*
* Inform our caller of how many tab stops we've used up.
*/
*indexPtr = index;
if (alignment == CENTER) {
/*
* Be very careful in the arithmetic below, because maxX may be the
* largest positive number: watch out for integer overflow.
*/
if ((maxX-tabX) < (tabX - x)) {
result = (maxX - x) - 2*(maxX - tabX);
} else {
result = 0;
}
goto done;
}
if (alignment == RIGHT) {
result = 0;
goto done;
}
/*
* Note: this treats NUMERIC alignment the same as LEFT alignment, which
* is somewhat conservative. However, it's pretty tricky at this point to
* figure out exactly where the damn decimal point will be.
*/
if (tabX > x) {
result = tabX - x;
} else {
result = 0;
}
done:
MeasureChars(textPtr->tkfont, " ", 1, 0, 1, 0, -1, 0, &spaceWidth);
if (result < spaceWidth) {
result = spaceWidth;
}
return result;
}
/*
*---------------------------------------------------------------------------
*
* NextTabStop --
*
* Given the current position, determine where the next default tab stop
* would be located. This function is called when the current chunk in
* the text has no tabs defined and so the default tab spacing for the
* font should be used, provided we are using wordprocessor style tabs.
*
* Results:
* The location in pixels of the next tab stop.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static int
NextTabStop(
Tk_Font tkfont, /* Font in which chunk that contains tab stop
* will be drawn. */
int x, /* X-position in pixels where last character
* was drawn. The next tab stop occurs
* somewhere after this location. */
int tabOrigin) /* The origin for tab stops. May be non-zero
* if text has been scrolled. */
{
int tabWidth, rem;
tabWidth = Tk_TextWidth(tkfont, "0", 1) * 8;
if (tabWidth == 0) {
tabWidth = 1;
}
x += tabWidth;
rem = (x - tabOrigin) % tabWidth;
if (rem < 0) {
rem += tabWidth;
}
x -= rem;
return x;
}
/*
*---------------------------------------------------------------------------
*
* MeasureChars --
*
* Determine the number of characters from the string that will fit in
* the given horizontal span. The measurement is done under the
* assumption that Tk_DrawChars will be used to actually display the
* characters.
*
* If tabs are encountered in the string, they will be ignored (they
* should only occur as last character of the string anyway).
*
* If a newline is encountered in the string, the line will be broken at
* that point.
*
* Results:
* The return value is the number of bytes from the range of start to end
* in source that fit in the span given by startX and maxX. *nextXPtr is
* filled in with the x-coordinate at which the first character that
* didn't fit would be drawn, if it were to be drawn.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
MeasureChars(
Tk_Font tkfont, /* Font in which to draw characters. */
CONST char *source, /* Characters to be displayed. Need not be
* NULL-terminated. */
int maxBytes, /* Maximum # of bytes to consider from
* source. */
int rangeStart, int rangeLength,
/* Range of bytes to consider in source.*/
int startX, /* X-position at which first character will be
* drawn. */
int maxX, /* Don't consider any character that would
* cross this x-position. */
int flags, /* Flags to pass to Tk_MeasureChars. */
int *nextXPtr) /* Return x-position of terminating character
* here. */
{
int curX, width, ch;
CONST char *special, *end, *start;
ch = 0; /* lint. */
curX = startX;
start = source + rangeStart;
end = start + rangeLength;
special = start;
while (start < end) {
if (start >= special) {
/*
* Find the next special character in the string.
*/
for (special = start; special < end; special++) {
ch = *special;
if ((ch == '\t') || (ch == '\n')) {
break;
}
}
}
/*
* Special points at the next special character (or the end of the
* string). Process characters between start and special.
*/
if ((maxX >= 0) && (curX >= maxX)) {
break;
}
#if TK_DRAW_IN_CONTEXT
start += TkpMeasureCharsInContext(tkfont, source, maxBytes,
start - source, special - start,
maxX >= 0 ? maxX - curX : -1, flags, &width);
#else
(void) maxBytes;
start += Tk_MeasureChars(tkfont, start, special - start,
maxX >= 0 ? maxX - curX : -1, flags, &width);
#endif /* TK_DRAW_IN_CONTEXT */
curX += width;
if (start < special) {
/*
* No more chars fit in line.
*/
break;
}
if (special < end) {
if (ch == '\t') {
start++;
} else {
break;
}
}
}
*nextXPtr = curX;
return start - (source+rangeStart);
}
/*
*----------------------------------------------------------------------
*
* TextGetScrollInfoObj --
*
* This function is invoked to parse "xview" and "yview" scrolling
* commands for text widgets using the new scrolling command syntax
* ("moveto" or "scroll" options). It extends the public
* Tk_GetScrollInfoObj function with the addition of "pixels" as a valid
* unit alongside "pages" and "units". It is a shame the core API isn't
* more flexible in this regard.
*
* Results:
* The return value is either TKTEXT_SCROLL_MOVETO, TKTEXT_SCROLL_PAGES,
* TKTEXT_SCROLL_UNITS, TKTEXT_SCROLL_PIXELS or TKTEXT_SCROLL_ERROR. This
* indicates whether the command was successfully parsed and what form
* the command took. If TKTEXT_SCROLL_MOVETO, *dblPtr is filled in with
* the desired position; if TKTEXT_SCROLL_PAGES, TKTEXT_SCROLL_PIXELS or
* TKTEXT_SCROLL_UNITS, *intPtr is filled in with the number of
* pages/pixels/lines to move (may be negative); if TKTEXT_SCROLL_ERROR,
* the interp's result contains an error message.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
TextGetScrollInfoObj(
Tcl_Interp *interp, /* Used for error reporting. */
TkText *textPtr, /* Information about the text widget. */
int objc, /* # arguments for command. */
Tcl_Obj *CONST objv[], /* Arguments for command. */
double *dblPtr, /* Filled in with argument "moveto" option, if
* any. */
int *intPtr) /* Filled in with number of pages or lines or
* pixels to scroll, if any. */
{
static CONST char *subcommands[] = {
"moveto", "scroll", NULL
};
enum viewSubcmds {
VIEW_MOVETO, VIEW_SCROLL
};
static CONST char *units[] = {
"units", "pages", "pixels", NULL
};
enum viewUnits {
VIEW_SCROLL_UNITS, VIEW_SCROLL_PAGES, VIEW_SCROLL_PIXELS
};
int index;
if (Tcl_GetIndexFromObj(interp, objv[2], subcommands, "option", 0,
&index) != TCL_OK) {
return TKTEXT_SCROLL_ERROR;
}
switch ((enum viewSubcmds) index) {
case VIEW_MOVETO:
if (objc != 4) {
Tcl_WrongNumArgs(interp, 3, objv, "fraction");
return TKTEXT_SCROLL_ERROR;
}
if (Tcl_GetDoubleFromObj(interp, objv[3], dblPtr) != TCL_OK) {
return TKTEXT_SCROLL_ERROR;
}
return TKTEXT_SCROLL_MOVETO;
case VIEW_SCROLL:
if (objc != 5) {
Tcl_WrongNumArgs(interp, 3, objv, "number units|pages|pixels");
return TKTEXT_SCROLL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[4], units, "argument", 0,
&index) != TCL_OK) {
return TKTEXT_SCROLL_ERROR;
}
switch ((enum viewUnits) index) {
case VIEW_SCROLL_PAGES:
if (Tcl_GetIntFromObj(interp, objv[3], intPtr) != TCL_OK) {
return TKTEXT_SCROLL_ERROR;
}
return TKTEXT_SCROLL_PAGES;
case VIEW_SCROLL_PIXELS:
if (Tk_GetPixelsFromObj(interp, textPtr->tkwin, objv[3],
intPtr) != TCL_OK) {
return TKTEXT_SCROLL_ERROR;
}
return TKTEXT_SCROLL_PIXELS;
case VIEW_SCROLL_UNITS:
if (Tcl_GetIntFromObj(interp, objv[3], intPtr) != TCL_OK) {
return TKTEXT_SCROLL_ERROR;
}
return TKTEXT_SCROLL_UNITS;
}
}
Tcl_Panic("unexpected switch fallthrough");
return TKTEXT_SCROLL_ERROR;
}
#if TK_LAYOUT_WITH_BASE_CHUNKS
/*
*----------------------------------------------------------------------
*
* FinalizeBaseChunk --
*
* This procedure makes sure that all the chunks of the stretch are
* up-to-date. It is invoked when the LayoutProc has been called for all
* chunks and the base chunk is stable.
*
* Results:
* None.
*
* Side effects:
* The CharInfo.chars of all dependent chunks point into
* BaseCharInfo.baseChars for easy access (and compatibility).
*
*----------------------------------------------------------------------
*/
static void
FinalizeBaseChunk(
TkTextDispChunk *addChunkPtr)
/* An additional chunk to add to the stretch,
* even though it may not be in the linked
* list yet. Used by the LayoutProc, otherwise
* NULL. */
{
const char *baseChars;
TkTextDispChunk *chunkPtr;
CharInfo *ciPtr;
#if TK_DRAW_IN_CONTEXT
int widthAdjust = 0;
int newwidth;
#endif /* TK_DRAW_IN_CONTEXT */
if (baseCharChunkPtr == NULL) {
return;
}
baseChars = Tcl_DStringValue(
&((BaseCharInfo *) baseCharChunkPtr->clientData)->baseChars);
for (chunkPtr = baseCharChunkPtr; chunkPtr != NULL;
chunkPtr = chunkPtr->nextPtr) {
#if TK_DRAW_IN_CONTEXT
chunkPtr->x += widthAdjust;
#endif /* TK_DRAW_IN_CONTEXT */
if (chunkPtr->displayProc != CharDisplayProc) {
continue;
}
ciPtr = (CharInfo *)chunkPtr->clientData;
if (ciPtr->baseChunkPtr != baseCharChunkPtr) {
break;
}
ciPtr->chars = baseChars + ciPtr->baseOffset;
#if TK_DRAW_IN_CONTEXT
newwidth = 0;
CharChunkMeasureChars(chunkPtr, NULL, 0, 0, -1, 0, -1, 0, &newwidth);
if (newwidth != chunkPtr->width) {
widthAdjust += newwidth - chunkPtr->width;
chunkPtr->width = newwidth;
}
#endif /* TK_DRAW_IN_CONTEXT */
}
if (addChunkPtr != NULL) {
ciPtr = (CharInfo *)addChunkPtr->clientData;
ciPtr->chars = baseChars + ciPtr->baseOffset;
#if TK_DRAW_IN_CONTEXT
addChunkPtr->x += widthAdjust;
CharChunkMeasureChars(addChunkPtr, NULL, 0, 0, -1, 0, -1, 0,
&addChunkPtr->width);
#endif /* TK_DRAW_IN_CONTEXT */
}
baseCharChunkPtr = NULL;
}
/*
*----------------------------------------------------------------------
*
* FreeBaseChunk --
*
* This procedure makes sure that all the chunks of the stretch are
* disconnected from the base chunk and the base chunk specific data is
* freed. It is invoked from the UndisplayProc. The procedure doesn't
* ckfree the base chunk clientData itself, that's up to the main
* UndisplayProc.
*
* Results:
* None.
*
* Side effects:
* The CharInfo.chars of all dependent chunks are set to NULL. Memory
* that belongs specifically to the base chunk is freed.
*
*----------------------------------------------------------------------
*/
static void
FreeBaseChunk(
TkTextDispChunk *baseChunkPtr)
/* The base chunk of the stretch and head of
* the linked list. */
{
TkTextDispChunk *chunkPtr;
CharInfo *ciPtr;
if (baseCharChunkPtr == baseChunkPtr) {
baseCharChunkPtr = NULL;
}
for (chunkPtr=baseChunkPtr; chunkPtr!=NULL; chunkPtr=chunkPtr->nextPtr) {
if (chunkPtr->undisplayProc != CharUndisplayProc) {
continue;
}
ciPtr = (CharInfo *) chunkPtr->clientData;
if (ciPtr->baseChunkPtr != baseChunkPtr) {
break;
}
ciPtr->baseChunkPtr = NULL;
ciPtr->chars = NULL;
}
Tcl_DStringFree(&((BaseCharInfo *) baseChunkPtr->clientData)->baseChars);
}
/*
*----------------------------------------------------------------------
*
* IsSameFGStyle --
*
* Compare the foreground attributes of two styles. Specifically must
* consider: foreground color, font, font style and font decorations,
* elide, "offset" and foreground stipple. Do *not* consider: background
* color, border, relief or background stipple.
*
* If we use TkpDrawCharsInContext(), we also don't need to check
* foreground color, font decorations, elide, offset and foreground
* stipple, so all that is left is font (including font size and font
* style) and "offset".
*
* Results:
* 1 if the two styles match, 0 otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
IsSameFGStyle(
TextStyle *style1,
TextStyle *style2)
{
StyleValues *sv1;
StyleValues *sv2;
if (style1 == style2) {
return 1;
}
#if !TK_DRAW_IN_CONTEXT
if (
#ifdef MAC_OSX_TK
!TkMacOSXCompareColors(style1->fgGC->foreground,
style2->fgGC->foreground)
#else
style1->fgGC->foreground != style2->fgGC->foreground
#endif
) {
return 0;
}
#endif /* !TK_DRAW_IN_CONTEXT */
sv1 = style1->sValuePtr;
sv2 = style2->sValuePtr;
#if TK_DRAW_IN_CONTEXT
return sv1->tkfont == sv2->tkfont && sv1->offset == sv2->offset;
#else
return sv1->tkfont == sv2->tkfont
&& sv1->underline == sv2->underline
&& sv1->overstrike == sv2->overstrike
&& sv1->elide == sv2->elide
&& sv1->offset == sv2->offset
&& sv1->fgStipple == sv1->fgStipple;
#endif /* TK_DRAW_IN_CONTEXT */
}
/*
*----------------------------------------------------------------------
*
* RemoveFromBaseChunk --
*
* This procedure removes a chunk from the stretch as a result of
* UndisplayProc. The chunk in question should be the last in a stretch.
* This happens during re-layouting of the break position.
*
* Results:
* None.
*
* Side effects:
* The characters that belong to this chunk are removed from the base
* chunk. It is assumed that LayoutProc and FinalizeBaseChunk are called
* next to repair any damage that this causes to the integrity of the
* stretch and the other chunks. For that reason the base chunk is also
* put into baseCharChunkPtr automatically, so that LayoutProc can resume
* correctly.
*
*----------------------------------------------------------------------
*/
static void
RemoveFromBaseChunk(
TkTextDispChunk *chunkPtr) /* The chunk to remove from the end of the
* stretch. */
{
CharInfo *ciPtr;
BaseCharInfo *bciPtr;
if (chunkPtr->displayProc != CharDisplayProc) {
#ifdef DEBUG_LAYOUT_WITH_BASE_CHUNKS
fprintf(stderr,"RemoveFromBaseChunk called with wrong chunk type\n");
#endif
return;
}
/*
* Reinstitute this base chunk for re-layout.
*/
ciPtr = (CharInfo *) chunkPtr->clientData;
baseCharChunkPtr = ciPtr->baseChunkPtr;
/*
* Remove the chunk data from the base chunk data.
*/
bciPtr = (BaseCharInfo *) baseCharChunkPtr->clientData;
if ((ciPtr->baseOffset + ciPtr->numBytes)
!= Tcl_DStringLength(&bciPtr->baseChars)) {
#ifdef DEBUG_LAYOUT_WITH_BASE_CHUNKS
fprintf(stderr,"RemoveFromBaseChunk called with wrong chunk "
"(not last)\n");
#endif
}
Tcl_DStringSetLength(&bciPtr->baseChars, ciPtr->baseOffset);
/*
* Invalidate the stored pixel width of the base chunk.
*/
bciPtr->width = -1;
}
#endif /* TK_LAYOUT_WITH_BASE_CHUNKS */
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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