/*
* tkCanvText.c --
*
* This file implements text items for canvas widgets.
*
* Copyright (c) 1991-1994 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 <stdio.h>
#include "tkInt.h"
#include "tkCanvas.h"
#include "default.h"
/*
* The structure below defines the record for each text item.
*/
typedef struct TextItem {
Tk_Item header; /* Generic stuff that's the same for all
* types. MUST BE FIRST IN STRUCTURE. */
Tk_CanvasTextInfo *textInfoPtr;
/* Pointer to a structure containing
* information about the selection and
* insertion cursor. The structure is owned by
* (and shared with) the generic canvas
* code. */
/*
* Fields that are set by widget commands other than "configure".
*/
double x, y; /* Positioning point for text. */
int insertPos; /* Character index of character just before
* which the insertion cursor is displayed. */
/*
* Configuration settings that are updated by Tk_ConfigureWidget.
*/
Tk_Anchor anchor; /* Where to anchor text relative to (x,y). */
Tk_TSOffset tsoffset;
XColor *color; /* Color for text. */
XColor *activeColor; /* Color for text. */
XColor *disabledColor; /* Color for text. */
Tk_Font tkfont; /* Font for drawing text. */
Tk_Justify justify; /* Justification mode for text. */
Pixmap stipple; /* Stipple bitmap for text, or None. */
Pixmap activeStipple; /* Stipple bitmap for text, or None. */
Pixmap disabledStipple; /* Stipple bitmap for text, or None. */
char *text; /* Text for item (malloc-ed). */
int width; /* Width of lines for word-wrap, pixels. Zero
* means no word-wrap. */
int underline; /* Index of character to put underline beneath
* or -1 for no underlining. */
/*
* Fields whose values are derived from the current values of the
* configuration settings above.
*/
int numChars; /* Length of text in characters. */
int numBytes; /* Length of text in bytes. */
Tk_TextLayout textLayout; /* Cached text layout information. */
int leftEdge; /* Pixel location of the left edge of the text
* item; where the left border of the text
* layout is drawn. */
int rightEdge; /* Pixel just to right of right edge of area
* of text item. Used for selecting up to end
* of line. */
GC gc; /* Graphics context for drawing text. */
GC selTextGC; /* Graphics context for selected text. */
GC cursorOffGC; /* If not None, this gives a graphics context
* to use to draw the insertion cursor when
* it's off. Used if the selection and
* insertion cursor colors are the same. */
} TextItem;
/*
* Information used for parsing configuration specs:
*/
static Tk_CustomOption stateOption = {
(Tk_OptionParseProc *) TkStateParseProc,
TkStatePrintProc, (ClientData) 2
};
static Tk_CustomOption tagsOption = {
(Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
Tk_CanvasTagsPrintProc, (ClientData) NULL
};
static Tk_CustomOption offsetOption = {
(Tk_OptionParseProc *) TkOffsetParseProc,
TkOffsetPrintProc, (ClientData) (TK_OFFSET_RELATIVE)
};
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_COLOR, "-activefill", NULL, NULL,
NULL, Tk_Offset(TextItem, activeColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,
NULL, Tk_Offset(TextItem, activeStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_ANCHOR, "-anchor", NULL, NULL,
"center", Tk_Offset(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
NULL, Tk_Offset(TextItem, disabledColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
NULL, Tk_Offset(TextItem, disabledStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-fill", NULL, NULL,
"black", Tk_Offset(TextItem, color), TK_CONFIG_NULL_OK},
{TK_CONFIG_FONT, "-font", NULL, NULL,
DEF_CANVTEXT_FONT, Tk_Offset(TextItem, tkfont), 0},
{TK_CONFIG_JUSTIFY, "-justify", NULL, NULL,
"left", Tk_Offset(TextItem, justify), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_CUSTOM, "-offset", NULL, NULL,
"0,0", Tk_Offset(TextItem, tsoffset),
TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
{TK_CONFIG_CUSTOM, "-state", NULL, NULL,
NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},
{TK_CONFIG_BITMAP, "-stipple", NULL, NULL,
NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
{TK_CONFIG_STRING, "-text", NULL, NULL,
"", Tk_Offset(TextItem, text), 0},
{TK_CONFIG_INT, "-underline", NULL, NULL,
"-1", Tk_Offset(TextItem, underline), 0},
{TK_CONFIG_PIXELS, "-width", NULL, NULL,
"0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};
/*
* Prototypes for functions defined in this file:
*/
static void ComputeTextBbox(Tk_Canvas canvas, TextItem *textPtr);
static int ConfigureText(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
Tcl_Obj *CONST objv[], int flags);
static int CreateText(Tcl_Interp *interp,
Tk_Canvas canvas, struct Tk_Item *itemPtr,
int argc, Tcl_Obj *CONST objv[]);
static void DeleteText(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display);
static void DisplayCanvText(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display, Drawable dst,
int x, int y, int width, int height);
static int GetSelText(Tk_Canvas canvas,
Tk_Item *itemPtr, int offset, char *buffer,
int maxBytes);
static int GetTextIndex(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr,
Tcl_Obj *obj, int *indexPtr);
static void ScaleText(Tk_Canvas canvas,
Tk_Item *itemPtr, double originX, double originY,
double scaleX, double scaleY);
static void SetTextCursor(Tk_Canvas canvas,
Tk_Item *itemPtr, int index);
static int TextCoords(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr,
int argc, Tcl_Obj *CONST objv[]);
static void TextDeleteChars(Tk_Canvas canvas,
Tk_Item *itemPtr, int first, int last);
static void TextInsert(Tk_Canvas canvas,
Tk_Item *itemPtr, int beforeThis, char *string);
static int TextToArea(Tk_Canvas canvas,
Tk_Item *itemPtr, double *rectPtr);
static double TextToPoint(Tk_Canvas canvas,
Tk_Item *itemPtr, double *pointPtr);
static int TextToPostscript(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
static void TranslateText(Tk_Canvas canvas,
Tk_Item *itemPtr, double deltaX, double deltaY);
/*
* The structures below defines the rectangle and oval item types by means of
* functions that can be invoked by generic item code.
*/
Tk_ItemType tkTextType = {
"text", /* name */
sizeof(TextItem), /* itemSize */
CreateText, /* createProc */
configSpecs, /* configSpecs */
ConfigureText, /* configureProc */
TextCoords, /* coordProc */
DeleteText, /* deleteProc */
DisplayCanvText, /* displayProc */
TK_CONFIG_OBJS, /* flags */
TextToPoint, /* pointProc */
TextToArea, /* areaProc */
TextToPostscript, /* postscriptProc */
ScaleText, /* scaleProc */
TranslateText, /* translateProc */
(Tk_ItemIndexProc *) GetTextIndex,/* indexProc */
SetTextCursor, /* icursorProc */
GetSelText, /* selectionProc */
TextInsert, /* insertProc */
TextDeleteChars, /* dTextProc */
NULL, /* nextPtr */
};
/*
*--------------------------------------------------------------
*
* CreateText --
*
* This function is invoked to create a new text item in a canvas.
*
* Results:
* A standard Tcl return value. If an error occurred in creating the item
* then an error message is left in the interp's result; in this case
* itemPtr is left uninitialized so it can be safely freed by the caller.
*
* Side effects:
* A new text item is created.
*
*--------------------------------------------------------------
*/
static int
CreateText(
Tcl_Interp *interp, /* Interpreter for error reporting. */
Tk_Canvas canvas, /* Canvas to hold new item. */
Tk_Item *itemPtr, /* Record to hold new item; header has been
* initialized by caller. */
int objc, /* Number of arguments in objv. */
Tcl_Obj *CONST objv[]) /* Arguments describing rectangle. */
{
TextItem *textPtr = (TextItem *) itemPtr;
int i;
if (objc == 0) {
Tcl_Panic("canvas did not pass any coords\n");
}
/*
* Carry out initialization that is needed in order to clean up after
* errors during the the remainder of this function.
*/
textPtr->textInfoPtr = Tk_CanvasGetTextInfo(canvas);
textPtr->insertPos = 0;
textPtr->anchor = TK_ANCHOR_CENTER;
textPtr->tsoffset.flags = 0;
textPtr->tsoffset.xoffset = 0;
textPtr->tsoffset.yoffset = 0;
textPtr->color = NULL;
textPtr->activeColor = NULL;
textPtr->disabledColor = NULL;
textPtr->tkfont = NULL;
textPtr->justify = TK_JUSTIFY_LEFT;
textPtr->stipple = None;
textPtr->activeStipple = None;
textPtr->disabledStipple = None;
textPtr->text = NULL;
textPtr->width = 0;
textPtr->underline = -1;
textPtr->numChars = 0;
textPtr->numBytes = 0;
textPtr->textLayout = NULL;
textPtr->leftEdge = 0;
textPtr->rightEdge = 0;
textPtr->gc = None;
textPtr->selTextGC = None;
textPtr->cursorOffGC = None;
/*
* Process the arguments to fill in the item record. Only 1 (list) or 2 (x
* y) coords are allowed.
*/
if (objc == 1) {
i = 1;
} else {
char *arg = Tcl_GetString(objv[1]);
i = 2;
if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
i = 1;
}
}
if ((TextCoords(interp, canvas, itemPtr, i, objv) != TCL_OK)) {
goto error;
}
if (ConfigureText(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
return TCL_OK;
}
error:
DeleteText(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* TextCoords --
*
* This function is invoked to process the "coords" widget command on
* text items. See the user documentation for details on what it does.
*
* Results:
* Returns TCL_OK or TCL_ERROR, and sets the interp's result.
*
* Side effects:
* The coordinates for the given item may be changed.
*
*--------------------------------------------------------------
*/
static int
TextCoords(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item whose coordinates are to be read or
* modified. */
int objc, /* Number of coordinates supplied in objv. */
Tcl_Obj *CONST objv[]) /* Array of coordinates: x1, y1, x2, y2, ... */
{
TextItem *textPtr = (TextItem *) itemPtr;
if (objc == 0) {
Tcl_Obj *obj = Tcl_NewObj();
Tcl_Obj *subobj = Tcl_NewDoubleObj(textPtr->x);
Tcl_ListObjAppendElement(interp, obj, subobj);
subobj = Tcl_NewDoubleObj(textPtr->y);
Tcl_ListObjAppendElement(interp, obj, subobj);
Tcl_SetObjResult(interp, obj);
} else if (objc < 3) {
if (objc==1) {
if (Tcl_ListObjGetElements(interp, objv[0], &objc,
(Tcl_Obj ***) &objv) != TCL_OK) {
return TCL_ERROR;
} else if (objc != 2) {
char buf[64 + TCL_INTEGER_SPACE];
sprintf(buf, "wrong # coordinates: expected 2, got %d", objc);
Tcl_SetResult(interp, buf, TCL_VOLATILE);
return TCL_ERROR;
}
}
if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],
&textPtr->x) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp, canvas, objv[1],
&textPtr->y) != TCL_OK)) {
return TCL_ERROR;
}
ComputeTextBbox(canvas, textPtr);
} else {
char buf[64 + TCL_INTEGER_SPACE];
sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", objc);
Tcl_SetResult(interp, buf, TCL_VOLATILE);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ConfigureText --
*
* This function is invoked to configure various aspects of a text item,
* such as its border and background colors.
*
* Results:
* A standard Tcl result code. If an error occurs, then an error message
* is left in the interp's result.
*
* Side effects:
* Configuration information, such as colors and stipple patterns, may be
* set for itemPtr.
*
*--------------------------------------------------------------
*/
static int
ConfigureText(
Tcl_Interp *interp, /* Interpreter for error reporting. */
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Rectangle item to reconfigure. */
int objc, /* Number of elements in objv. */
Tcl_Obj *CONST objv[], /* Arguments describing things to configure. */
int flags) /* Flags to pass to Tk_ConfigureWidget. */
{
TextItem *textPtr = (TextItem *) itemPtr;
XGCValues gcValues;
GC newGC, newSelGC;
unsigned long mask;
Tk_Window tkwin;
Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
XColor *selBgColorPtr;
XColor *color;
Pixmap stipple;
Tk_State state;
tkwin = Tk_CanvasTkwin(canvas);
if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
(CONST char **) objv, (char *) textPtr, flags|TK_CONFIG_OBJS)) {
return TCL_ERROR;
}
/*
* A few of the options require additional processing, such as graphics
* contexts.
*/
state = itemPtr->state;
if (textPtr->activeColor != NULL || textPtr->activeStipple != None) {
itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
} else {
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
}
if(state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
color = textPtr->color;
stipple = textPtr->stipple;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (textPtr->activeColor!=NULL) {
color = textPtr->activeColor;
}
if (textPtr->activeStipple!=None) {
stipple = textPtr->activeStipple;
}
} else if (state==TK_STATE_DISABLED) {
if (textPtr->disabledColor!=NULL) {
color = textPtr->disabledColor;
}
if (textPtr->disabledStipple!=None) {
stipple = textPtr->disabledStipple;
}
}
newGC = newSelGC = None;
if (textPtr->tkfont != NULL) {
gcValues.font = Tk_FontId(textPtr->tkfont);
mask = GCFont;
if (color != NULL) {
gcValues.foreground = color->pixel;
mask |= GCForeground;
if (stipple != None) {
gcValues.stipple = stipple;
gcValues.fill_style = FillStippled;
mask |= GCStipple|GCFillStyle;
}
newGC = Tk_GetGC(tkwin, mask, &gcValues);
}
mask &= ~(GCTile|GCFillStyle|GCStipple);
if (stipple != None) {
gcValues.stipple = stipple;
gcValues.fill_style = FillStippled;
mask |= GCStipple|GCFillStyle;
}
if (textInfoPtr->selFgColorPtr != NULL) {
gcValues.foreground = textInfoPtr->selFgColorPtr->pixel;
}
newSelGC = Tk_GetGC(tkwin, mask|GCForeground, &gcValues);
}
if (textPtr->gc != None) {
Tk_FreeGC(Tk_Display(tkwin), textPtr->gc);
}
textPtr->gc = newGC;
if (textPtr->selTextGC != None) {
Tk_FreeGC(Tk_Display(tkwin), textPtr->selTextGC);
}
textPtr->selTextGC = newSelGC;
selBgColorPtr = Tk_3DBorderColor(textInfoPtr->selBorder);
if (Tk_3DBorderColor(textInfoPtr->insertBorder)->pixel
== selBgColorPtr->pixel) {
if (selBgColorPtr->pixel == BlackPixelOfScreen(Tk_Screen(tkwin))) {
gcValues.foreground = WhitePixelOfScreen(Tk_Screen(tkwin));
} else {
gcValues.foreground = BlackPixelOfScreen(Tk_Screen(tkwin));
}
newGC = Tk_GetGC(tkwin, GCForeground, &gcValues);
} else {
newGC = None;
}
if (textPtr->cursorOffGC != None) {
Tk_FreeGC(Tk_Display(tkwin), textPtr->cursorOffGC);
}
textPtr->cursorOffGC = newGC;
/*
* If the text was changed, move the selection and insertion indices to
* keep them inside the item.
*/
textPtr->numBytes = strlen(textPtr->text);
textPtr->numChars = Tcl_NumUtfChars(textPtr->text, textPtr->numBytes);
if (textInfoPtr->selItemPtr == itemPtr) {
if (textInfoPtr->selectFirst >= textPtr->numChars) {
textInfoPtr->selItemPtr = NULL;
} else {
if (textInfoPtr->selectLast >= textPtr->numChars) {
textInfoPtr->selectLast = textPtr->numChars - 1;
}
if ((textInfoPtr->anchorItemPtr == itemPtr)
&& (textInfoPtr->selectAnchor >= textPtr->numChars)) {
textInfoPtr->selectAnchor = textPtr->numChars - 1;
}
}
}
if (textPtr->insertPos >= textPtr->numChars) {
textPtr->insertPos = textPtr->numChars;
}
ComputeTextBbox(canvas, textPtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DeleteText --
*
* This function is called to clean up the data structure associated with
* a text item.
*
* Results:
* None.
*
* Side effects:
* Resources associated with itemPtr are released.
*
*--------------------------------------------------------------
*/
static void
DeleteText(
Tk_Canvas canvas, /* Info about overall canvas widget. */
Tk_Item *itemPtr, /* Item that is being deleted. */
Display *display) /* Display containing window for canvas. */
{
TextItem *textPtr = (TextItem *) itemPtr;
if (textPtr->color != NULL) {
Tk_FreeColor(textPtr->color);
}
if (textPtr->activeColor != NULL) {
Tk_FreeColor(textPtr->activeColor);
}
if (textPtr->disabledColor != NULL) {
Tk_FreeColor(textPtr->disabledColor);
}
Tk_FreeFont(textPtr->tkfont);
if (textPtr->stipple != None) {
Tk_FreeBitmap(display, textPtr->stipple);
}
if (textPtr->activeStipple != None) {
Tk_FreeBitmap(display, textPtr->activeStipple);
}
if (textPtr->disabledStipple != None) {
Tk_FreeBitmap(display, textPtr->disabledStipple);
}
if (textPtr->text != NULL) {
ckfree(textPtr->text);
}
Tk_FreeTextLayout(textPtr->textLayout);
if (textPtr->gc != None) {
Tk_FreeGC(display, textPtr->gc);
}
if (textPtr->selTextGC != None) {
Tk_FreeGC(display, textPtr->selTextGC);
}
if (textPtr->cursorOffGC != None) {
Tk_FreeGC(display, textPtr->cursorOffGC);
}
}
/*
*--------------------------------------------------------------
*
* ComputeTextBbox --
*
* This function is invoked to compute the bounding box of all the pixels
* that may be drawn as part of a text item. In addition, it recomputes
* all of the geometry information used to display a text item or check
* for mouse hits.
*
* Results:
* None.
*
* Side effects:
* The fields x1, y1, x2, and y2 are updated in the header for itemPtr,
* and the linePtr structure is regenerated for itemPtr.
*
*--------------------------------------------------------------
*/
static void
ComputeTextBbox(
Tk_Canvas canvas, /* Canvas that contains item. */
TextItem *textPtr) /* Item whose bbox is to be recomputed. */
{
Tk_CanvasTextInfo *textInfoPtr;
int leftX, topY, width, height, fudge;
Tk_State state = textPtr->header.state;
if(state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
Tk_FreeTextLayout(textPtr->textLayout);
textPtr->textLayout = Tk_ComputeTextLayout(textPtr->tkfont,
textPtr->text, textPtr->numChars, textPtr->width,
textPtr->justify, 0, &width, &height);
if (state == TK_STATE_HIDDEN || textPtr->color == NULL) {
width = height = 0;
}
/*
* Use overall geometry information to compute the top-left corner of the
* bounding box for the text item.
*/
leftX = (int) floor(textPtr->x + 0.5);
topY = (int) floor(textPtr->y + 0.5);
switch (textPtr->anchor) {
case TK_ANCHOR_NW:
case TK_ANCHOR_N:
case TK_ANCHOR_NE:
break;
case TK_ANCHOR_W:
case TK_ANCHOR_CENTER:
case TK_ANCHOR_E:
topY -= height / 2;
break;
case TK_ANCHOR_SW:
case TK_ANCHOR_S:
case TK_ANCHOR_SE:
topY -= height;
break;
}
switch (textPtr->anchor) {
case TK_ANCHOR_NW:
case TK_ANCHOR_W:
case TK_ANCHOR_SW:
break;
case TK_ANCHOR_N:
case TK_ANCHOR_CENTER:
case TK_ANCHOR_S:
leftX -= width / 2;
break;
case TK_ANCHOR_NE:
case TK_ANCHOR_E:
case TK_ANCHOR_SE:
leftX -= width;
break;
}
textPtr->leftEdge = leftX;
textPtr->rightEdge = leftX + width;
/*
* Last of all, update the bounding box for the item. The item's bounding
* box includes the bounding box of all its lines, plus an extra fudge
* factor for the cursor border (which could potentially be quite large).
*/
textInfoPtr = textPtr->textInfoPtr;
fudge = (textInfoPtr->insertWidth + 1) / 2;
if (textInfoPtr->selBorderWidth > fudge) {
fudge = textInfoPtr->selBorderWidth;
}
textPtr->header.x1 = leftX - fudge;
textPtr->header.y1 = topY;
textPtr->header.x2 = leftX + width + fudge;
textPtr->header.y2 = topY + height;
}
/*
*--------------------------------------------------------------
*
* DisplayCanvText --
*
* This function is invoked to draw a text item in a given drawable.
*
* Results:
* None.
*
* Side effects:
* ItemPtr is drawn in drawable using the transformation information in
* canvas.
*
*--------------------------------------------------------------
*/
static void
DisplayCanvText(
Tk_Canvas canvas, /* Canvas that contains item. */
Tk_Item *itemPtr, /* Item to be displayed. */
Display *display, /* Display on which to draw item. */
Drawable drawable, /* Pixmap or window in which to draw item. */
int x, int y, int width, int height)
/* Describes region of canvas that must be
* redisplayed (not used). */
{
TextItem *textPtr;
Tk_CanvasTextInfo *textInfoPtr;
int selFirstChar, selLastChar;
short drawableX, drawableY;
Pixmap stipple;
Tk_State state = itemPtr->state;
textPtr = (TextItem *) itemPtr;
textInfoPtr = textPtr->textInfoPtr;
if(state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
stipple = textPtr->stipple;
if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (textPtr->activeStipple!=None) {
stipple = textPtr->activeStipple;
}
} else if (state==TK_STATE_DISABLED) {
if (textPtr->disabledStipple!=None) {
stipple = textPtr->disabledStipple;
}
}
if (textPtr->gc == None) {
return;
}
/*
* If we're stippling, then modify the stipple offset in the GC. Be sure
* to reset the offset when done, since the GC is supposed to be
* read-only.
*/
if (stipple != None) {
Tk_CanvasSetOffset(canvas, textPtr->gc, &textPtr->tsoffset);
}
selFirstChar = -1;
selLastChar = 0; /* lint. */
if (textInfoPtr->selItemPtr == itemPtr) {
selFirstChar = textInfoPtr->selectFirst;
selLastChar = textInfoPtr->selectLast;
if (selLastChar > textPtr->numChars) {
selLastChar = textPtr->numChars - 1;
}
if ((selFirstChar >= 0) && (selFirstChar <= selLastChar)) {
int xFirst, yFirst, hFirst;
int xLast, yLast, wLast;
/*
* Draw a special background under the selection.
*/
Tk_CharBbox(textPtr->textLayout, selFirstChar, &xFirst, &yFirst,
NULL, &hFirst);
Tk_CharBbox(textPtr->textLayout, selLastChar, &xLast, &yLast,
&wLast, NULL);
/*
* If the selection spans the end of this line, then display
* selection background all the way to the end of the line.
* However, for the last line we only want to display up to the
* last character, not the end of the line.
*/
x = xFirst;
height = hFirst;
for (y = yFirst ; y <= yLast; y += height) {
if (y == yLast) {
width = xLast + wLast - x;
} else {
width = textPtr->rightEdge - textPtr->leftEdge - x;
}
Tk_CanvasDrawableCoords(canvas,
(double) (textPtr->leftEdge + x
- textInfoPtr->selBorderWidth),
(double) (textPtr->header.y1 + y),
&drawableX, &drawableY);
Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
textInfoPtr->selBorder, drawableX, drawableY,
width + 2 * textInfoPtr->selBorderWidth,
height, textInfoPtr->selBorderWidth, TK_RELIEF_RAISED);
x = 0;
}
}
}
/*
* If the insertion point should be displayed, then draw a special
* background for the cursor before drawing the text. Note: if we're the
* cursor item but the cursor is turned off, then redraw background over
* the area of the cursor. This guarantees that the selection won't make
* the cursor invisible on mono displays, where both are drawn in the same
* color.
*/
if ((textInfoPtr->focusItemPtr == itemPtr) && (textInfoPtr->gotFocus)) {
if (Tk_CharBbox(textPtr->textLayout, textPtr->insertPos,
&x, &y, NULL, &height)) {
Tk_CanvasDrawableCoords(canvas,
(double) (textPtr->leftEdge + x
- (textInfoPtr->insertWidth / 2)),
(double) (textPtr->header.y1 + y),
&drawableX, &drawableY);
Tk_SetCaretPos(Tk_CanvasTkwin(canvas), drawableX, drawableY,
height);
if (textInfoPtr->cursorOn) {
Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
textInfoPtr->insertBorder,
drawableX, drawableY,
textInfoPtr->insertWidth, height,
textInfoPtr->insertBorderWidth, TK_RELIEF_RAISED);
} else if (textPtr->cursorOffGC != None) {
/*
* Redraw the background over the area of the cursor, even
* though the cursor is turned off. This guarantees that the
* selection won't make the cursor invisible on mono displays,
* where both may be drawn in the same color.
*/
XFillRectangle(display, drawable, textPtr->cursorOffGC,
drawableX, drawableY,
(unsigned) textInfoPtr->insertWidth,
(unsigned) height);
}
}
}
/*
* If there is no selected text or the selected text foreground is the
* same as the regular text foreground, then draw one text string. If
* there is selected text and the foregrounds differ, draw the regular
* text up to the selection, draw the selection, then draw the rest of the
* regular text. Drawing the regular text and then the selected text over
* it would causes problems with anti-aliased text because the two
* anti-aliasing colors would blend together.
*/
Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge,
(double) textPtr->header.y1, &drawableX, &drawableY);
if ((selFirstChar >= 0) && (textPtr->selTextGC != textPtr->gc)) {
Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
drawableX, drawableY, 0, selFirstChar);
Tk_DrawTextLayout(display, drawable, textPtr->selTextGC,
textPtr->textLayout, drawableX, drawableY, selFirstChar,
selLastChar + 1);
Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
drawableX, drawableY, selLastChar + 1, -1);
} else {
Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
drawableX, drawableY, 0, -1);
}
Tk_UnderlineTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
drawableX, drawableY, textPtr->underline);
if (stipple != None) {
XSetTSOrigin(display, textPtr->gc, 0, 0);
}
}
/*
*--------------------------------------------------------------
*
* TextInsert --
*
* Insert characters into a text item at a given position.
*
* Results:
* None.
*
* Side effects:
* The text in the given item is modified. The cursor and selection
* positions are also modified to reflect the insertion.
*
*--------------------------------------------------------------
*/
static void
TextInsert(
Tk_Canvas canvas, /* Canvas containing text item. */
Tk_Item *itemPtr, /* Text item to be modified. */
int index, /* Character index before which string is to
* be inserted. */
char *string) /* New characters to be inserted. */
{
TextItem *textPtr = (TextItem *) itemPtr;
int byteIndex, byteCount, charsAdded;
char *newStr, *text;
Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
string = Tcl_GetStringFromObj((Tcl_Obj *) string, &byteCount);
text = textPtr->text;
if (index < 0) {
index = 0;
}
if (index > textPtr->numChars) {
index = textPtr->numChars;
}
byteIndex = Tcl_UtfAtIndex(text, index) - text;
byteCount = strlen(string);
if (byteCount == 0) {
return;
}
newStr = (char *) ckalloc((unsigned) textPtr->numBytes + byteCount + 1);
memcpy(newStr, text, (size_t) byteIndex);
strcpy(newStr + byteIndex, string);
strcpy(newStr + byteIndex + byteCount, text + byteIndex);
ckfree(text);
textPtr->text = newStr;
charsAdded = Tcl_NumUtfChars(string, byteCount);
textPtr->numChars += charsAdded;
textPtr->numBytes += byteCount;
/*
* Inserting characters invalidates indices such as those for the
* selection and cursor. Update the indices appropriately.
*/
if (textInfoPtr->selItemPtr == itemPtr) {
if (textInfoPtr->selectFirst >= index) {
textInfoPtr->selectFirst += charsAdded;
}
if (textInfoPtr->selectLast >= index) {
textInfoPtr->selectLast += charsAdded;
}
if ((textInfoPtr->anchorItemPtr == itemPtr)
&& (textInfoPtr->selectAnchor >= index)) {
textInfoPtr->selectAnchor += charsAdded;
}
}
if (textPtr->insertPos >= index) {
textPtr->insertPos += charsAdded;
}
ComputeTextBbox(canvas, textPtr);
}
/*
*--------------------------------------------------------------
*
* TextDeleteChars --
*
* Delete one or more characters from a text item.
*
* Results:
* None.
*
* Side effects:
* Characters between "first" and "last", inclusive, get deleted from
* itemPtr, and things like the selection position get updated.
*
*--------------------------------------------------------------
*/
static void
TextDeleteChars(
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Item in which to delete characters. */
int first, /* Character index of first character to
* delete. */
int last) /* Character index of last character to delete
* (inclusive). */
{
TextItem *textPtr = (TextItem *) itemPtr;
int byteIndex, byteCount, charsRemoved;
char *newStr, *text;
Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
text = textPtr->text;
if (first < 0) {
first = 0;
}
if (last >= textPtr->numChars) {
last = textPtr->numChars - 1;
}
if (first > last) {
return;
}
charsRemoved = last + 1 - first;
byteIndex = Tcl_UtfAtIndex(text, first) - text;
byteCount = Tcl_UtfAtIndex(text + byteIndex, charsRemoved)
- (text + byteIndex);
newStr = (char *) ckalloc((unsigned) (textPtr->numBytes + 1 - byteCount));
memcpy(newStr, text, (size_t) byteIndex);
strcpy(newStr + byteIndex, text + byteIndex + byteCount);
ckfree(text);
textPtr->text = newStr;
textPtr->numChars -= charsRemoved;
textPtr->numBytes -= byteCount;
/*
* Update indexes for the selection and cursor to reflect the renumbering
* of the remaining characters.
*/
if (textInfoPtr->selItemPtr == itemPtr) {
if (textInfoPtr->selectFirst > first) {
textInfoPtr->selectFirst -= charsRemoved;
if (textInfoPtr->selectFirst < first) {
textInfoPtr->selectFirst = first;
}
}
if (textInfoPtr->selectLast >= first) {
textInfoPtr->selectLast -= charsRemoved;
if (textInfoPtr->selectLast < first - 1) {
textInfoPtr->selectLast = first - 1;
}
}
if (textInfoPtr->selectFirst > textInfoPtr->selectLast) {
textInfoPtr->selItemPtr = NULL;
}
if ((textInfoPtr->anchorItemPtr == itemPtr)
&& (textInfoPtr->selectAnchor > first)) {
textInfoPtr->selectAnchor -= charsRemoved;
if (textInfoPtr->selectAnchor < first) {
textInfoPtr->selectAnchor = first;
}
}
}
if (textPtr->insertPos > first) {
textPtr->insertPos -= charsRemoved;
if (textPtr->insertPos < first) {
textPtr->insertPos = first;
}
}
ComputeTextBbox(canvas, textPtr);
return;
}
/*
*--------------------------------------------------------------
*
* TextToPoint --
*
* Computes the distance from a given point to a given text item, in
* canvas units.
*
* Results:
* The return value is 0 if the point whose x and y coordinates are
* pointPtr[0] and pointPtr[1] is inside the text item. If the point
* isn't inside the text item then the return value is the distance from
* the point to the text item.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static double
TextToPoint(
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Item to check against point. */
double *pointPtr) /* Pointer to x and y coordinates. */
{
TextItem *textPtr;
Tk_State state = itemPtr->state;
double value;
if (state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
textPtr = (TextItem *) itemPtr;
value = (double) Tk_DistanceToTextLayout(textPtr->textLayout,
(int) pointPtr[0] - textPtr->leftEdge,
(int) pointPtr[1] - textPtr->header.y1);
if ((state == TK_STATE_HIDDEN) || (textPtr->color == NULL) ||
(textPtr->text == NULL) || (*textPtr->text == 0)) {
value = 1.0e36;
}
return value;
}
/*
*--------------------------------------------------------------
*
* TextToArea --
*
* This function is called to determine whether an item lies entirely
* inside, entirely outside, or overlapping a given rectangle.
*
* Results:
* -1 is returned if the item is entirely outside the area given by
* rectPtr, 0 if it overlaps, and 1 if it is entirely inside the given
* area.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
TextToArea(
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Item to check against rectangle. */
double *rectPtr) /* Pointer to array of four coordinates
* (x1,y1,x2,y2) describing rectangular
* area. */
{
TextItem *textPtr;
Tk_State state = itemPtr->state;
if (state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
textPtr = (TextItem *) itemPtr;
return Tk_IntersectTextLayout(textPtr->textLayout,
(int) (rectPtr[0] + 0.5) - textPtr->leftEdge,
(int) (rectPtr[1] + 0.5) - textPtr->header.y1,
(int) (rectPtr[2] - rectPtr[0] + 0.5),
(int) (rectPtr[3] - rectPtr[1] + 0.5));
}
/*
*--------------------------------------------------------------
*
* ScaleText --
*
* This function is invoked to rescale a text item.
*
* Results:
* None.
*
* Side effects:
* Scales the position of the text, but not the size of the font for the
* text.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static void
ScaleText(
Tk_Canvas canvas, /* Canvas containing rectangle. */
Tk_Item *itemPtr, /* Rectangle to be scaled. */
double originX, double originY,
/* Origin about which to scale rect. */
double scaleX, /* Amount to scale in X direction. */
double scaleY) /* Amount to scale in Y direction. */
{
TextItem *textPtr = (TextItem *) itemPtr;
textPtr->x = originX + scaleX*(textPtr->x - originX);
textPtr->y = originY + scaleY*(textPtr->y - originY);
ComputeTextBbox(canvas, textPtr);
return;
}
/*
*--------------------------------------------------------------
*
* TranslateText --
*
* This function is called to move a text item by a given amount.
*
* Results:
* None.
*
* Side effects:
* The position of the text item is offset by (xDelta, yDelta), and the
* bounding box is updated in the generic part of the item structure.
*
*--------------------------------------------------------------
*/
static void
TranslateText(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item that is being moved. */
double deltaX, double deltaY)
/* Amount by which item is to be moved. */
{
TextItem *textPtr = (TextItem *) itemPtr;
textPtr->x += deltaX;
textPtr->y += deltaY;
ComputeTextBbox(canvas, textPtr);
}
/*
*--------------------------------------------------------------
*
* GetTextIndex --
*
* Parse an index into a text item and return either its value or an
* error.
*
* Results:
* A standard Tcl result. If all went well, then *indexPtr is filled in
* with the index (into itemPtr) corresponding to string. Otherwise an
* error message is left in the interp's result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
GetTextIndex(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item for which the index is being
* specified. */
Tcl_Obj *obj, /* Specification of a particular character in
* itemPtr's text. */
int *indexPtr) /* Where to store converted character
* index. */
{
TextItem *textPtr = (TextItem *) itemPtr;
int length;
int c;
TkCanvas *canvasPtr = (TkCanvas *) canvas;
Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
char *string = Tcl_GetStringFromObj(obj, &length);
c = string[0];
if ((c == 'e') && (strncmp(string, "end", (unsigned) length) == 0)) {
*indexPtr = textPtr->numChars;
} else if ((c == 'i')
&& (strncmp(string, "insert", (unsigned) length) == 0)) {
*indexPtr = textPtr->insertPos;
} else if ((c == 's') && (length >= 5)
&& (strncmp(string, "sel.first", (unsigned) length) == 0)) {
if (textInfoPtr->selItemPtr != itemPtr) {
Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
return TCL_ERROR;
}
*indexPtr = textInfoPtr->selectFirst;
} else if ((c == 's') && (length >= 5)
&& (strncmp(string, "sel.last", (unsigned) length) == 0)) {
if (textInfoPtr->selItemPtr != itemPtr) {
Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
return TCL_ERROR;
}
*indexPtr = textInfoPtr->selectLast;
} else if (c == '@') {
int x, y;
double tmp;
char *end, *p;
p = string+1;
tmp = strtod(p, &end);
if ((end == p) || (*end != ',')) {
goto badIndex;
}
x = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
p = end+1;
tmp = strtod(p, &end);
if ((end == p) || (*end != 0)) {
goto badIndex;
}
y = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
*indexPtr = Tk_PointToChar(textPtr->textLayout,
x + canvasPtr->scrollX1 - textPtr->leftEdge,
y + canvasPtr->scrollY1 - textPtr->header.y1);
} else if (Tcl_GetIntFromObj(NULL, obj, indexPtr) == TCL_OK) {
if (*indexPtr < 0){
*indexPtr = 0;
} else if (*indexPtr > textPtr->numChars) {
*indexPtr = textPtr->numChars;
}
} else {
/*
* Some of the paths here leave messages in the interp's result, so we
* have to clear it out before storing our own message.
*/
badIndex:
Tcl_SetResult(interp, NULL, TCL_STATIC);
Tcl_AppendResult(interp, "bad index \"", string, "\"", NULL);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* SetTextCursor --
*
* Set the position of the insertion cursor in this item.
*
* Results:
* None.
*
* Side effects:
* The cursor position will change.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static void
SetTextCursor(
Tk_Canvas canvas, /* Record describing canvas widget. */
Tk_Item *itemPtr, /* Text item in which cursor position is to be
* set. */
int index) /* Character index of character just before
* which cursor is to be positioned. */
{
TextItem *textPtr = (TextItem *) itemPtr;
if (index < 0) {
textPtr->insertPos = 0;
} else if (index > textPtr->numChars) {
textPtr->insertPos = textPtr->numChars;
} else {
textPtr->insertPos = index;
}
}
/*
*--------------------------------------------------------------
*
* GetSelText --
*
* This function is invoked to return the selected portion of a text
* item. It is only called when this item has the selection.
*
* Results:
* The return value is the number of non-NULL bytes stored at buffer.
* Buffer is filled (or partially filled) with a NULL-terminated string
* containing part or all of the selection, as given by offset and
* maxBytes.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
GetSelText(
Tk_Canvas canvas, /* Canvas containing selection. */
Tk_Item *itemPtr, /* Text item containing selection. */
int offset, /* Byte offset within selection of first
* character to be returned. */
char *buffer, /* Location in which to place selection. */
int maxBytes) /* Maximum number of bytes to place at buffer,
* not including terminating NULL
* character. */
{
TextItem *textPtr = (TextItem *) itemPtr;
int byteCount;
char *text;
CONST char *selStart, *selEnd;
Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
if ((textInfoPtr->selectFirst < 0) ||
(textInfoPtr->selectFirst > textInfoPtr->selectLast)) {
return 0;
}
text = textPtr->text;
selStart = Tcl_UtfAtIndex(text, textInfoPtr->selectFirst);
selEnd = Tcl_UtfAtIndex(selStart,
textInfoPtr->selectLast + 1 - textInfoPtr->selectFirst);
byteCount = selEnd - selStart - offset;
if (byteCount > maxBytes) {
byteCount = maxBytes;
}
if (byteCount <= 0) {
return 0;
}
memcpy(buffer, selStart + offset, (size_t) byteCount);
buffer[byteCount] = '\0';
return byteCount;
}
/*
*--------------------------------------------------------------
*
* TextToPostscript --
*
* This function is called to generate Postscript for text items.
*
* Results:
* The return value is a standard Tcl result. If an error occurs in
* generating Postscript then an error message is left in the interp's
* result, replacing whatever used to be there. If no error occurs, then
* Postscript for the item is appended to the result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
TextToPostscript(
Tcl_Interp *interp, /* Leave Postscript or error message here. */
Tk_Canvas canvas, /* Information about overall canvas. */
Tk_Item *itemPtr, /* Item for which Postscript is wanted. */
int prepass) /* 1 means this is a prepass to collect font
* information; 0 means final Postscript is
* being created. */
{
TextItem *textPtr = (TextItem *) itemPtr;
int x, y;
Tk_FontMetrics fm;
char *justify;
char buffer[500];
XColor *color;
Pixmap stipple;
Tk_State state = itemPtr->state;
if (state == TK_STATE_NULL) {
state = ((TkCanvas *)canvas)->canvas_state;
}
color = textPtr->color;
stipple = textPtr->stipple;
if (state == TK_STATE_HIDDEN || textPtr->color == NULL ||
textPtr->text == NULL || *textPtr->text == 0) {
return TCL_OK;
} else if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
if (textPtr->activeColor!=NULL) {
color = textPtr->activeColor;
}
if (textPtr->activeStipple!=None) {
stipple = textPtr->activeStipple;
}
} else if (state==TK_STATE_DISABLED) {
if (textPtr->disabledColor!=NULL) {
color = textPtr->disabledColor;
}
if (textPtr->disabledStipple!=None) {
stipple = textPtr->disabledStipple;
}
}
if (Tk_CanvasPsFont(interp, canvas, textPtr->tkfont) != TCL_OK) {
return TCL_ERROR;
}
if (prepass != 0) {
return TCL_OK;
}
if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
return TCL_ERROR;
}
if (stipple != None) {
Tcl_AppendResult(interp, "/StippleText {\n ", NULL);
Tk_CanvasPsStipple(interp, canvas, stipple);
Tcl_AppendResult(interp, "} bind def\n", NULL);
}
sprintf(buffer, "%.15g %.15g [\n", textPtr->x,
Tk_CanvasPsY(canvas, textPtr->y));
Tcl_AppendResult(interp, buffer, NULL);
Tk_TextLayoutToPostscript(interp, textPtr->textLayout);
x = 0; y = 0; justify = NULL; /* lint. */
switch (textPtr->anchor) {
case TK_ANCHOR_NW: x = 0; y = 0; break;
case TK_ANCHOR_N: x = 1; y = 0; break;
case TK_ANCHOR_NE: x = 2; y = 0; break;
case TK_ANCHOR_E: x = 2; y = 1; break;
case TK_ANCHOR_SE: x = 2; y = 2; break;
case TK_ANCHOR_S: x = 1; y = 2; break;
case TK_ANCHOR_SW: x = 0; y = 2; break;
case TK_ANCHOR_W: x = 0; y = 1; break;
case TK_ANCHOR_CENTER: x = 1; y = 1; break;
}
switch (textPtr->justify) {
case TK_JUSTIFY_LEFT: justify = "0"; break;
case TK_JUSTIFY_CENTER: justify = "0.5"; break;
case TK_JUSTIFY_RIGHT: justify = "1"; break;
}
Tk_GetFontMetrics(textPtr->tkfont, &fm);
sprintf(buffer, "] %d ", fm.linespace);
Tcl_AppendResult(interp, buffer, NULL);
Tcl_PrintDouble(NULL, x / -2.0, buffer);
Tcl_AppendResult(interp, buffer, NULL);
Tcl_PrintDouble(NULL, y / 2.0, buffer);
Tcl_AppendResult(interp, " ", buffer, NULL);
sprintf(buffer, " %s %s DrawText\n",
justify, ((stipple == None) ? "false" : "true"));
Tcl_AppendResult(interp, buffer, NULL);
return TCL_OK;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/