/*
* tkCanvas.c --
*
* This module implements canvas widgets for the Tk toolkit. A canvas
* displays a background and a collection of graphical objects such as
* rectangles, lines, and texts.
*
* Copyright (c) 1991-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 1998-1999 by Scriptics Corporation.
*
* 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 "tkCanvas.h"
#include "default.h"
#ifdef TK_NO_DOUBLE_BUFFERING
#ifdef MAC_OSX_TK
#include "tkMacOSXInt.h"
#endif
#endif /* TK_NO_DOUBLE_BUFFERING */
/*
* See tkCanvas.h for key data structures used to implement canvases.
*/
/*
* The structure defined below is used to keep track of a tag search in
* progress. No field should be accessed by anyone other than TagSearchScan,
* TagSearchFirst, TagSearchNext, TagSearchScanExpr, TagSearchEvalExpr,
* TagSearchExprInit, TagSearchExprDestroy, TagSearchDestroy.
* (
* Not quite accurate: the TagSearch structure is also accessed from:
* CanvasWidgetCmd, FindItems, RelinkItems
* The only instances of the structure are owned by:
* CanvasWidgetCmd
* CanvasWidgetCmd is the only function that calls:
* FindItems, RelinkItems
* CanvasWidgetCmd, FindItems, RelinkItems, are the only functions that call
* TagSearch*
* )
*/
typedef struct TagSearch {
TkCanvas *canvasPtr; /* Canvas widget being searched. */
Tk_Item *currentPtr; /* Pointer to last item returned. */
Tk_Item *lastPtr; /* The item right before the currentPtr is
* tracked so if the currentPtr is deleted we
* don't have to start from the beginning. */
int searchOver; /* Non-zero means NextItem should always
* return NULL. */
int type; /* Search type (see #defs below) */
int id; /* Item id for searches by id */
const char *string; /* Tag expression string */
int stringIndex; /* Current position in string scan */
int stringLength; /* Length of tag expression string */
char *rewritebuffer; /* Tag string (after removing escapes) */
unsigned int rewritebufferAllocated;
/* Available space for rewrites. */
TagSearchExpr *expr; /* Compiled tag expression. */
} TagSearch;
/*
* Values for the TagSearch type field.
*/
#define SEARCH_TYPE_EMPTY 0 /* Looking for empty tag */
#define SEARCH_TYPE_ID 1 /* Looking for an item by id */
#define SEARCH_TYPE_ALL 2 /* Looking for all items */
#define SEARCH_TYPE_TAG 3 /* Looking for an item by simple tag */
#define SEARCH_TYPE_EXPR 4 /* Compound search */
/*
* Custom option for handling "-state" and "-offset"
*/
static const Tk_CustomOption stateOption = {
TkStateParseProc, TkStatePrintProc,
NULL /* Only "normal" and "disabled". */
};
static const Tk_CustomOption offsetOption = {
TkOffsetParseProc, TkOffsetPrintProc, INT2PTR(TK_OFFSET_RELATIVE)
};
/*
* Information used for argv parsing.
*/
static const Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_CANVAS_BG_COLOR, offsetof(TkCanvas, bgBorder),
TK_CONFIG_COLOR_ONLY, NULL},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_CANVAS_BG_MONO, offsetof(TkCanvas, bgBorder),
TK_CONFIG_MONO_ONLY, NULL},
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", NULL, NULL, 0, 0, NULL},
{TK_CONFIG_SYNONYM, "-bg", "background", NULL, NULL, 0, 0, NULL},
{TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
DEF_CANVAS_BORDER_WIDTH, offsetof(TkCanvas, borderWidth), 0, NULL},
{TK_CONFIG_DOUBLE, "-closeenough", "closeEnough", "CloseEnough",
DEF_CANVAS_CLOSE_ENOUGH, offsetof(TkCanvas, closeEnough), 0, NULL},
{TK_CONFIG_BOOLEAN, "-confine", "confine", "Confine",
DEF_CANVAS_CONFINE, offsetof(TkCanvas, confine), 0, NULL},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_CANVAS_CURSOR, offsetof(TkCanvas, cursor), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_PIXELS, "-height", "height", "Height",
DEF_CANVAS_HEIGHT, offsetof(TkCanvas, height), 0, NULL},
{TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
"HighlightBackground", DEF_CANVAS_HIGHLIGHT_BG,
offsetof(TkCanvas, highlightBgColorPtr), 0, NULL},
{TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
DEF_CANVAS_HIGHLIGHT, offsetof(TkCanvas, highlightColorPtr), 0, NULL},
{TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
"HighlightThickness",
DEF_CANVAS_HIGHLIGHT_WIDTH, offsetof(TkCanvas, highlightWidth), 0, NULL},
{TK_CONFIG_BORDER, "-insertbackground", "insertBackground", "Foreground",
DEF_CANVAS_INSERT_BG, offsetof(TkCanvas, textInfo.insertBorder), 0, NULL},
{TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
DEF_CANVAS_INSERT_BD_COLOR,
offsetof(TkCanvas, textInfo.insertBorderWidth), TK_CONFIG_COLOR_ONLY, NULL},
{TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
DEF_CANVAS_INSERT_BD_MONO,
offsetof(TkCanvas, textInfo.insertBorderWidth), TK_CONFIG_MONO_ONLY, NULL},
{TK_CONFIG_INT, "-insertofftime", "insertOffTime", "OffTime",
DEF_CANVAS_INSERT_OFF_TIME, offsetof(TkCanvas, insertOffTime), 0, NULL},
{TK_CONFIG_INT, "-insertontime", "insertOnTime", "OnTime",
DEF_CANVAS_INSERT_ON_TIME, offsetof(TkCanvas, insertOnTime), 0, NULL},
{TK_CONFIG_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
DEF_CANVAS_INSERT_WIDTH, offsetof(TkCanvas, textInfo.insertWidth), 0, NULL},
{TK_CONFIG_CUSTOM, "-offset", "offset", "Offset", "0,0",
offsetof(TkCanvas, tsoffset),TK_CONFIG_DONT_SET_DEFAULT,
&offsetOption},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_CANVAS_RELIEF, offsetof(TkCanvas, relief), 0, NULL},
{TK_CONFIG_STRING, "-scrollregion", "scrollRegion", "ScrollRegion",
DEF_CANVAS_SCROLL_REGION, offsetof(TkCanvas, regionString),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
DEF_CANVAS_SELECT_COLOR, offsetof(TkCanvas, textInfo.selBorder),
TK_CONFIG_COLOR_ONLY, NULL},
{TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
DEF_CANVAS_SELECT_MONO, offsetof(TkCanvas, textInfo.selBorder),
TK_CONFIG_MONO_ONLY, NULL},
{TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
DEF_CANVAS_SELECT_BD_COLOR,
offsetof(TkCanvas, textInfo.selBorderWidth), TK_CONFIG_COLOR_ONLY, NULL},
{TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
DEF_CANVAS_SELECT_BD_MONO, offsetof(TkCanvas, textInfo.selBorderWidth),
TK_CONFIG_MONO_ONLY, NULL},
{TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
DEF_CANVAS_SELECT_FG_COLOR, offsetof(TkCanvas, textInfo.selFgColorPtr),
TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
DEF_CANVAS_SELECT_FG_MONO, offsetof(TkCanvas, textInfo.selFgColorPtr),
TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_CUSTOM, "-state", "state", "State",
"normal", offsetof(TkCanvas, canvas_state), TK_CONFIG_DONT_SET_DEFAULT,
&stateOption},
{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
DEF_CANVAS_TAKE_FOCUS, offsetof(TkCanvas, takeFocus),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_PIXELS, "-width", "width", "Width",
DEF_CANVAS_WIDTH, offsetof(TkCanvas, width), 0, NULL},
{TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
DEF_CANVAS_X_SCROLL_CMD, offsetof(TkCanvas, xScrollCmd),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_PIXELS, "-xscrollincrement", "xScrollIncrement",
"ScrollIncrement",
DEF_CANVAS_X_SCROLL_INCREMENT, offsetof(TkCanvas, xScrollIncrement),
0, NULL},
{TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
DEF_CANVAS_Y_SCROLL_CMD, offsetof(TkCanvas, yScrollCmd),
TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_PIXELS, "-yscrollincrement", "yScrollIncrement",
"ScrollIncrement",
DEF_CANVAS_Y_SCROLL_INCREMENT, offsetof(TkCanvas, yScrollIncrement),
0, NULL},
{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL}
};
/*
* List of all the item types known at present. This is *global* and is
* protected by typeListMutex.
*/
static Tk_ItemType *typeList = NULL;
/* NULL means initialization hasn't been done
* yet. */
TCL_DECLARE_MUTEX(typeListMutex)
/*
* Uids for operands in compiled advanced tag search expressions.
* Initialization is done by GetStaticUids()
*/
typedef struct {
Tk_Uid allUid;
Tk_Uid currentUid;
Tk_Uid andUid;
Tk_Uid orUid;
Tk_Uid xorUid;
Tk_Uid parenUid;
Tk_Uid negparenUid;
Tk_Uid endparenUid;
Tk_Uid tagvalUid;
Tk_Uid negtagvalUid;
} SearchUids;
static Tcl_ThreadDataKey dataKey;
static SearchUids * GetStaticUids(void);
/*
* Prototypes for functions defined later in this file:
*/
static void CanvasBindProc(ClientData clientData,
XEvent *eventPtr);
static void CanvasBlinkProc(ClientData clientData);
static void CanvasCmdDeletedProc(ClientData clientData);
static void CanvasDoEvent(TkCanvas *canvasPtr, XEvent *eventPtr);
static void CanvasEventProc(ClientData clientData,
XEvent *eventPtr);
static int CanvasFetchSelection(ClientData clientData, int offset,
char *buffer, int maxBytes);
static Tk_Item * CanvasFindClosest(TkCanvas *canvasPtr,
double coords[2]);
static void CanvasFocusProc(TkCanvas *canvasPtr, int gotFocus);
static void CanvasLostSelection(ClientData clientData);
static void CanvasSelectTo(TkCanvas *canvasPtr,
Tk_Item *itemPtr, int index);
static void CanvasSetOrigin(TkCanvas *canvasPtr,
int xOrigin, int yOrigin);
static void CanvasUpdateScrollbars(TkCanvas *canvasPtr);
static int CanvasWidgetCmd(ClientData clientData,
Tcl_Interp *interp, int argc,
Tcl_Obj *const *argv);
static void CanvasWorldChanged(ClientData instanceData);
static int ConfigureCanvas(Tcl_Interp *interp,
TkCanvas *canvasPtr, int argc,
Tcl_Obj *const *argv, int flags);
static void DefaultRotateImplementation(TkCanvas *canvasPtr,
Tk_Item *itemPtr, double x, double y,
double angleRadians);
static void DestroyCanvas(void *memPtr);
static int DrawCanvas(Tcl_Interp *interp, ClientData clientData, Tk_PhotoHandle photohandle, int subsample, int zoom);
static void DisplayCanvas(ClientData clientData);
static void DoItem(Tcl_Obj *accumObj,
Tk_Item *itemPtr, Tk_Uid tag);
static void EventuallyRedrawItem(TkCanvas *canvasPtr,
Tk_Item *itemPtr);
static int FindItems(Tcl_Interp *interp, TkCanvas *canvasPtr,
int argc, Tcl_Obj *const *argv,
Tcl_Obj *newTagObj, int first,
TagSearch **searchPtrPtr);
static int FindArea(Tcl_Interp *interp, TkCanvas *canvasPtr,
Tcl_Obj *const *argv, Tk_Uid uid, int enclosed);
static double GridAlign(double coord, double spacing);
static const char** TkGetStringsFromObjs(int argc, Tcl_Obj *const *objv);
static void InitCanvas(void);
static void PickCurrentItem(TkCanvas *canvasPtr, XEvent *eventPtr);
static Tcl_Obj * ScrollFractions(int screen1,
int screen2, int object1, int object2);
static int RelinkItems(TkCanvas *canvasPtr, Tcl_Obj *tag,
Tk_Item *prevPtr, TagSearch **searchPtrPtr);
static void TagSearchExprInit(TagSearchExpr **exprPtrPtr);
static void TagSearchExprDestroy(TagSearchExpr *expr);
static void TagSearchDestroy(TagSearch *searchPtr);
static int TagSearchScan(TkCanvas *canvasPtr,
Tcl_Obj *tag, TagSearch **searchPtrPtr);
static int TagSearchScanExpr(Tcl_Interp *interp,
TagSearch *searchPtr, TagSearchExpr *expr);
static int TagSearchEvalExpr(TagSearchExpr *expr,
Tk_Item *itemPtr);
static Tk_Item * TagSearchFirst(TagSearch *searchPtr);
static Tk_Item * TagSearchNext(TagSearch *searchPtr);
/*
* The structure below defines canvas class behavior by means of functions
* that can be invoked from generic window code.
*/
static const Tk_ClassProcs canvasClass = {
sizeof(Tk_ClassProcs), /* size */
CanvasWorldChanged, /* worldChangedProc */
NULL, /* createProc */
NULL /* modalProc */
};
/*
* Macros that significantly simplify all code that finds items.
*/
#define FIRST_CANVAS_ITEM_MATCHING(objPtr,searchPtrPtr,errorExitClause) \
if ((result=TagSearchScan(canvasPtr,(objPtr),(searchPtrPtr))) != TCL_OK){ \
errorExitClause; \
} \
itemPtr = TagSearchFirst(*(searchPtrPtr));
#define FOR_EVERY_CANVAS_ITEM_MATCHING(objPtr,searchPtrPtr,errorExitClause) \
if ((result=TagSearchScan(canvasPtr,(objPtr),(searchPtrPtr))) != TCL_OK){ \
errorExitClause; \
} \
for (itemPtr = TagSearchFirst(*(searchPtrPtr)); \
itemPtr != NULL; itemPtr = TagSearchNext(*(searchPtrPtr)))
#define FIND_ITEMS(objPtr, n) \
FindItems(interp, canvasPtr, objc, objv, (objPtr), (n), &searchPtr)
#define RELINK_ITEMS(objPtr, itemPtr) \
result = RelinkItems(canvasPtr, (objPtr), (itemPtr), &searchPtr)
/*
* ----------------------------------------------------------------------
*
* AlwaysRedraw, ItemConfigure, ItemCoords, etc. --
*
* Helper functions that make access to canvas item functions simpler.
* Note that these are all inline functions.
*
* ----------------------------------------------------------------------
*/
static inline int
AlwaysRedraw(
Tk_Item *itemPtr)
{
return itemPtr->typePtr->alwaysRedraw & 1;
}
static inline int
ItemConfigure(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
int objc,
Tcl_Obj *const objv[])
{
Tcl_Interp *interp = canvasPtr->interp;
int result;
if (itemPtr->typePtr->alwaysRedraw & TK_CONFIG_OBJS) {
result = itemPtr->typePtr->configProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objc, objv, TK_CONFIG_ARGV_ONLY);
} else {
const char **args = TkGetStringsFromObjs(objc, objv);
result = itemPtr->typePtr->configProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objc, (Tcl_Obj **) args, TK_CONFIG_ARGV_ONLY);
if (args != NULL) {
ckfree(args);
}
}
return result;
}
static inline int
ItemConfigInfo(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
Tcl_Obj *fieldName)
{
return Tk_ConfigureInfo(canvasPtr->interp, canvasPtr->tkwin,
itemPtr->typePtr->configSpecs, (char *) itemPtr,
(fieldName ? Tcl_GetString(fieldName) : NULL), 0);
}
static inline int
ItemConfigValue(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
Tcl_Obj *fieldName)
{
return Tk_ConfigureValue(canvasPtr->interp, canvasPtr->tkwin,
itemPtr->typePtr->configSpecs, (char *) itemPtr,
Tcl_GetString(fieldName), 0);
}
static inline int
ItemCoords(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
int objc,
Tcl_Obj *const objv[])
{
Tcl_Interp *interp = canvasPtr->interp;
int result;
if (itemPtr->typePtr->coordProc == NULL) {
result = TCL_OK;
} else if (itemPtr->typePtr->alwaysRedraw & TK_CONFIG_OBJS) {
result = itemPtr->typePtr->coordProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objc, objv);
} else {
const char **args = TkGetStringsFromObjs(objc, objv);
result = itemPtr->typePtr->coordProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objc, (Tcl_Obj **) args);
if (args != NULL) {
ckfree(args);
}
}
return result;
}
static inline int
ItemCreate(
TkCanvas *canvasPtr,
Tk_Item *itemPtr, /* Warning: incomplete! typePtr field must be
* set by this point. */
int objc,
Tcl_Obj *const objv[])
{
Tcl_Interp *interp = canvasPtr->interp;
int result;
if (itemPtr->typePtr->alwaysRedraw & TK_CONFIG_OBJS) {
result = itemPtr->typePtr->createProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objc-3, objv+3);
} else {
const char **args = TkGetStringsFromObjs(objc-3, objv+3);
result = itemPtr->typePtr->createProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objc-3, (Tcl_Obj **) args);
if (args != NULL) {
ckfree(args);
}
}
return result;
}
static inline void
ItemCursor(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
int index)
{
itemPtr->typePtr->icursorProc((Tk_Canvas) canvasPtr, itemPtr, index);
}
static inline void
ItemDelChars(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
int first,
int last)
{
itemPtr->typePtr->dCharsProc((Tk_Canvas) canvasPtr, itemPtr, first, last);
}
static inline void
ItemDelete(
TkCanvas *canvasPtr,
Tk_Item *itemPtr)
{
itemPtr->typePtr->deleteProc((Tk_Canvas) canvasPtr, itemPtr,
canvasPtr->display);
}
static inline void
ItemDisplay(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
Pixmap pixmap,
int screenX1, int screenY1,
int width, int height)
{
itemPtr->typePtr->displayProc((Tk_Canvas) canvasPtr, itemPtr,
canvasPtr->display, pixmap, screenX1, screenY1, width, height);
}
static inline int
ItemIndex(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
Tcl_Obj *objPtr,
int *indexPtr)
{
Tcl_Interp *interp = canvasPtr->interp;
if (itemPtr->typePtr->indexProc == NULL) {
return TCL_OK;
} else if (itemPtr->typePtr->alwaysRedraw & TK_CONFIG_OBJS) {
return itemPtr->typePtr->indexProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, objPtr, indexPtr);
} else {
return itemPtr->typePtr->indexProc(interp, (Tk_Canvas) canvasPtr,
itemPtr, (Tcl_Obj *) Tcl_GetString(objPtr), indexPtr);
}
}
static inline void
ItemInsert(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
int beforeThis,
Tcl_Obj *toInsert)
{
if (itemPtr->typePtr->alwaysRedraw & TK_CONFIG_OBJS) {
itemPtr->typePtr->insertProc((Tk_Canvas) canvasPtr, itemPtr,
beforeThis, toInsert);
} else {
itemPtr->typePtr->insertProc((Tk_Canvas) canvasPtr, itemPtr,
beforeThis, (Tcl_Obj *) Tcl_GetString(toInsert));
}
}
static inline int
ItemOverlap(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
double rect[])
{
return itemPtr->typePtr->areaProc((Tk_Canvas) canvasPtr, itemPtr, rect);
}
static inline double
ItemPoint(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
double coords[],
double halo)
{
double dist;
dist = itemPtr->typePtr->pointProc((Tk_Canvas) canvasPtr, itemPtr,
coords) - halo;
return (dist < 0.0) ? 0.0 : dist;
}
static inline void
ItemScale(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
double xOrigin, double yOrigin,
double xScale, double yScale)
{
itemPtr->typePtr->scaleProc((Tk_Canvas) canvasPtr, itemPtr,
xOrigin, yOrigin, xScale, yScale);
}
static inline int
ItemSelection(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
int offset,
char *buffer,
int maxBytes)
{
if (itemPtr == NULL || itemPtr->typePtr->selectionProc == NULL) {
return -1;
}
return itemPtr->typePtr->selectionProc((Tk_Canvas) canvasPtr, itemPtr,
offset, buffer, maxBytes);
}
static inline void
ItemTranslate(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
double xDelta,
double yDelta)
{
itemPtr->typePtr->translateProc((Tk_Canvas) canvasPtr, itemPtr,
xDelta, yDelta);
}
static inline void
ItemRotate(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
double x,
double y,
double angleRadians)
{
if (itemPtr->typePtr->rotateProc != NULL) {
itemPtr->typePtr->rotateProc((Tk_Canvas) canvasPtr,
itemPtr, x, y, angleRadians);
} else {
DefaultRotateImplementation(canvasPtr, itemPtr, x, y, angleRadians);
}
}
/*
*--------------------------------------------------------------
*
* DefaultRotateImplementation --
*
* The default implementation of the rotation operation, used when items
* do not provide their own version.
*
*--------------------------------------------------------------
*/
static void
DefaultRotateImplementation(
TkCanvas *canvasPtr,
Tk_Item *itemPtr,
double x,
double y,
double angleRadians)
{
int objc, i, ok = 1;
Tcl_Obj **objv, **newObjv;
double *coordv;
double s = sin(angleRadians);
double c = cos(angleRadians);
Tcl_Interp *interp = canvasPtr->interp;
/*
* Get the coordinates out of the item.
*/
if (ItemCoords(canvasPtr, itemPtr, 0, NULL) == TCL_OK &&
Tcl_ListObjGetElements(NULL, Tcl_GetObjResult(interp),
&objc, &objv) == TCL_OK) {
coordv = (double *) ckalloc(sizeof(double) * objc);
for (i=0 ; i<objc ; i++) {
if (Tcl_GetDoubleFromObj(NULL, objv[i], &coordv[i]) != TCL_OK) {
ok = 0;
break;
}
}
if (ok) {
/*
* Apply the rotation.
*/
for (i=0 ; i<objc ; i+=2) {
double px = coordv[i+0] - x;
double py = coordv[i+1] - y;
double nx = px * c - py * s;
double ny = px * s + py * c;
coordv[i+0] = nx + x;
coordv[i+1] = ny + y;
}
/*
* Write the coordinates back into the item.
*/
newObjv = (Tcl_Obj **) ckalloc(sizeof(Tcl_Obj *) * objc);
for (i=0 ; i<objc ; i++) {
newObjv[i] = Tcl_NewDoubleObj(coordv[i]);
Tcl_IncrRefCount(newObjv[i]);
}
ItemCoords(canvasPtr, itemPtr, objc, newObjv);
for (i=0 ; i<objc ; i++) {
Tcl_DecrRefCount(newObjv[i]);
}
ckfree((char *) newObjv);
}
ckfree((char *) coordv);
}
/*
* The interpreter result was (probably) modified above; reset it.
*/
Tcl_ResetResult(interp);
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasObjCmd --
*
* This function is invoked to process the "canvas" Tcl command. See the
* user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasObjCmd(
ClientData clientData, /* Main window associated with interpreter. */
Tcl_Interp *interp, /* Current interpreter. */
int argc, /* Number of arguments. */
Tcl_Obj *const argv[]) /* Argument objects. */
{
Tk_Window tkwin = clientData;
TkCanvas *canvasPtr;
Tk_Window newWin;
if (typeList == NULL) {
InitCanvas();
}
if (argc < 2) {
Tcl_WrongNumArgs(interp, 1, argv, "pathName ?-option value ...?");
return TCL_ERROR;
}
newWin = Tk_CreateWindowFromPath(interp,tkwin,Tcl_GetString(argv[1]),NULL);
if (newWin == NULL) {
return TCL_ERROR;
}
/*
* Initialize fields that won't be initialized by ConfigureCanvas, or
* which ConfigureCanvas expects to have reasonable values (e.g. resource
* pointers).
*/
canvasPtr = ckalloc(sizeof(TkCanvas));
canvasPtr->tkwin = newWin;
canvasPtr->display = Tk_Display(newWin);
canvasPtr->interp = interp;
canvasPtr->widgetCmd = Tcl_CreateObjCommand(interp,
Tk_PathName(canvasPtr->tkwin), CanvasWidgetCmd, canvasPtr,
CanvasCmdDeletedProc);
canvasPtr->firstItemPtr = NULL;
canvasPtr->lastItemPtr = NULL;
canvasPtr->borderWidth = 0;
canvasPtr->bgBorder = NULL;
canvasPtr->relief = TK_RELIEF_FLAT;
canvasPtr->highlightWidth = 0;
canvasPtr->highlightBgColorPtr = NULL;
canvasPtr->highlightColorPtr = NULL;
canvasPtr->inset = 0;
canvasPtr->pixmapGC = NULL;
canvasPtr->width = None;
canvasPtr->height = None;
canvasPtr->confine = 0;
canvasPtr->textInfo.selBorder = NULL;
canvasPtr->textInfo.selBorderWidth = 0;
canvasPtr->textInfo.selFgColorPtr = NULL;
canvasPtr->textInfo.selItemPtr = NULL;
canvasPtr->textInfo.selectFirst = -1;
canvasPtr->textInfo.selectLast = -1;
canvasPtr->textInfo.anchorItemPtr = NULL;
canvasPtr->textInfo.selectAnchor = 0;
canvasPtr->textInfo.insertBorder = NULL;
canvasPtr->textInfo.insertWidth = 0;
canvasPtr->textInfo.insertBorderWidth = 0;
canvasPtr->textInfo.focusItemPtr = NULL;
canvasPtr->textInfo.gotFocus = 0;
canvasPtr->textInfo.cursorOn = 0;
canvasPtr->insertOnTime = 0;
canvasPtr->insertOffTime = 0;
canvasPtr->insertBlinkHandler = NULL;
canvasPtr->xOrigin = canvasPtr->yOrigin = 0;
canvasPtr->drawableXOrigin = canvasPtr->drawableYOrigin = 0;
canvasPtr->bindingTable = NULL;
canvasPtr->currentItemPtr = NULL;
canvasPtr->newCurrentPtr = NULL;
canvasPtr->closeEnough = 0.0;
canvasPtr->pickEvent.type = LeaveNotify;
canvasPtr->pickEvent.xcrossing.x = 0;
canvasPtr->pickEvent.xcrossing.y = 0;
canvasPtr->state = 0;
canvasPtr->xScrollCmd = NULL;
canvasPtr->yScrollCmd = NULL;
canvasPtr->scrollX1 = 0;
canvasPtr->scrollY1 = 0;
canvasPtr->scrollX2 = 0;
canvasPtr->scrollY2 = 0;
canvasPtr->regionString = NULL;
canvasPtr->xScrollIncrement = 0;
canvasPtr->yScrollIncrement = 0;
canvasPtr->scanX = 0;
canvasPtr->scanXOrigin = 0;
canvasPtr->scanY = 0;
canvasPtr->scanYOrigin = 0;
canvasPtr->hotPtr = NULL;
canvasPtr->hotPrevPtr = NULL;
canvasPtr->cursor = NULL;
canvasPtr->takeFocus = NULL;
canvasPtr->pixelsPerMM = WidthOfScreen(Tk_Screen(newWin));
canvasPtr->pixelsPerMM /= WidthMMOfScreen(Tk_Screen(newWin));
canvasPtr->flags = 0;
canvasPtr->nextId = 1;
canvasPtr->psInfo = NULL;
canvasPtr->canvas_state = TK_STATE_NORMAL;
canvasPtr->tsoffset.flags = 0;
canvasPtr->tsoffset.xoffset = 0;
canvasPtr->tsoffset.yoffset = 0;
canvasPtr->bindTagExprs = NULL;
Tcl_InitHashTable(&canvasPtr->idTable, TCL_ONE_WORD_KEYS);
Tk_SetClass(canvasPtr->tkwin, "Canvas");
Tk_SetClassProcs(canvasPtr->tkwin, &canvasClass, canvasPtr);
Tk_CreateEventHandler(canvasPtr->tkwin,
ExposureMask|StructureNotifyMask|FocusChangeMask,
CanvasEventProc, canvasPtr);
Tk_CreateEventHandler(canvasPtr->tkwin, KeyPressMask|KeyReleaseMask
|ButtonPressMask|ButtonReleaseMask|EnterWindowMask
|LeaveWindowMask|PointerMotionMask|VirtualEventMask,
CanvasBindProc, canvasPtr);
Tk_CreateSelHandler(canvasPtr->tkwin, XA_PRIMARY, XA_STRING,
CanvasFetchSelection, canvasPtr, XA_STRING);
if (ConfigureCanvas(interp, canvasPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
Tcl_SetObjResult(interp, TkNewWindowObj(canvasPtr->tkwin));
return TCL_OK;
error:
Tk_DestroyWindow(canvasPtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* CanvasWidgetCmd --
*
* This function is invoked to process the Tcl command that corresponds
* to a widget managed by this module. See the user documentation for
* details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
static int
CanvasWidgetCmd(
ClientData clientData, /* Information about canvas widget. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
TkCanvas *canvasPtr = clientData;
int c, result;
Tk_Item *itemPtr = NULL; /* Initialization needed only to prevent
* compiler warning. */
TagSearch *searchPtr = NULL;/* Allocated by first TagSearchScan, freed by
* TagSearchDestroy */
int index;
static const char *const optionStrings[] = {
"addtag", "bbox", "bind", "canvasx",
"canvasy", "cget", "configure", "coords",
"create", "dchars", "delete", "dtag",
"find", "focus", "gettags", "icursor",
"image", "imove", "index", "insert",
"itemcget", "itemconfigure",
"lower", "move", "moveto", "postscript",
"raise", "rchars", "rotate", "scale",
"scan", "select", "type", "xview",
"yview", NULL
};
enum options {
CANV_ADDTAG, CANV_BBOX, CANV_BIND, CANV_CANVASX,
CANV_CANVASY, CANV_CGET, CANV_CONFIGURE, CANV_COORDS,
CANV_CREATE, CANV_DCHARS, CANV_DELETE, CANV_DTAG,
CANV_FIND, CANV_FOCUS, CANV_GETTAGS, CANV_ICURSOR,
CANV_IMAGE, CANV_IMOVE, CANV_INDEX, CANV_INSERT,
CANV_ITEMCGET, CANV_ITEMCONFIGURE,
CANV_LOWER, CANV_MOVE, CANV_MOVETO, CANV_POSTSCRIPT,
CANV_RAISE, CANV_RCHARS, CANV_ROTATE, CANV_SCALE,
CANV_SCAN, CANV_SELECT, CANV_TYPE, CANV_XVIEW,
CANV_YVIEW
};
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], optionStrings, "option", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
Tcl_Preserve(canvasPtr);
result = TCL_OK;
switch ((enum options) index) {
case CANV_ADDTAG:
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "tag searchCommand ?arg ...?");
result = TCL_ERROR;
goto done;
}
result = FIND_ITEMS(objv[2], 3);
break;
case CANV_BBOX: {
int i, gotAny;
int x1 = 0, y1 = 0, x2 = 0, y2 = 0; /* Initializations needed only
* to prevent overcautious
* compiler warnings. */
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?tagOrId ...?");
result = TCL_ERROR;
goto done;
}
gotAny = 0;
for (i = 2; i < objc; i++) {
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[i], &searchPtr, goto done) {
if ((itemPtr->x1 >= itemPtr->x2)
|| (itemPtr->y1 >= itemPtr->y2)) {
continue;
}
if (!gotAny) {
x1 = itemPtr->x1;
y1 = itemPtr->y1;
x2 = itemPtr->x2;
y2 = itemPtr->y2;
gotAny = 1;
} else {
if (itemPtr->x1 < x1) {
x1 = itemPtr->x1;
}
if (itemPtr->y1 < y1) {
y1 = itemPtr->y1;
}
if (itemPtr->x2 > x2) {
x2 = itemPtr->x2;
}
if (itemPtr->y2 > y2) {
y2 = itemPtr->y2;
}
}
}
}
if (gotAny) {
Tcl_Obj *resultObjs[4];
resultObjs[0] = Tcl_NewWideIntObj(x1);
resultObjs[1] = Tcl_NewWideIntObj(y1);
resultObjs[2] = Tcl_NewWideIntObj(x2);
resultObjs[3] = Tcl_NewWideIntObj(y2);
Tcl_SetObjResult(interp, Tcl_NewListObj(4, resultObjs));
}
break;
}
case CANV_BIND: {
void *object;
if ((objc < 3) || (objc > 5)) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?sequence? ?command?");
result = TCL_ERROR;
goto done;
}
/*
* Figure out what object to use for the binding (individual item vs.
* tag).
*/
object = NULL;
result = TagSearchScan(canvasPtr, objv[2], &searchPtr);
if (result != TCL_OK) {
goto done;
}
if (searchPtr->type == SEARCH_TYPE_ID) {
Tcl_HashEntry *entryPtr;
entryPtr = Tcl_FindHashEntry(&canvasPtr->idTable,
INT2PTR(searchPtr->id));
if (entryPtr != NULL) {
itemPtr = Tcl_GetHashValue(entryPtr);
object = itemPtr;
}
if (object == 0) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"item \"%s\" doesn't exist", Tcl_GetString(objv[2])));
Tcl_SetErrorCode(interp, "TK", "LOOKUP", "CANVAS_ITEM",
Tcl_GetString(objv[2]), NULL);
result = TCL_ERROR;
goto done;
}
} else {
object = (char *)searchPtr->expr->uid;
}
/*
* Make a binding table if the canvas doesn't already have one.
*/
if (canvasPtr->bindingTable == NULL) {
canvasPtr->bindingTable = Tk_CreateBindingTable(interp);
}
if (objc == 5) {
int append = 0;
unsigned long mask;
const char *argv4 = Tcl_GetString(objv[4]);
if (argv4[0] == 0) {
result = Tk_DeleteBinding(interp, canvasPtr->bindingTable,
object, Tcl_GetString(objv[3]));
goto done;
}
if (searchPtr->type == SEARCH_TYPE_EXPR) {
/*
* If new tag expression, then insert in linked list.
*/
TagSearchExpr *expr, **lastPtr;
lastPtr = &(canvasPtr->bindTagExprs);
while ((expr = *lastPtr) != NULL) {
if (expr->uid == searchPtr->expr->uid) {
break;
}
lastPtr = &(expr->next);
}
if (!expr) {
/*
* Transfer ownership of expr to bindTagExprs list.
*/
*lastPtr = searchPtr->expr;
searchPtr->expr->next = NULL;
/*
* Flag in TagSearch that expr has changed ownership so
* that TagSearchDestroy doesn't try to free it.
*/
searchPtr->expr = NULL;
}
}
if (argv4[0] == '+') {
argv4++;
append = 1;
}
mask = Tk_CreateBinding(interp, canvasPtr->bindingTable,
object, Tcl_GetString(objv[3]), argv4, append);
if (mask == 0) {
result = TCL_ERROR;
goto done;
}
if (mask & ~(unsigned long)(ButtonMotionMask|Button1MotionMask
|Button2MotionMask|Button3MotionMask|Button4MotionMask
|Button5MotionMask|ButtonPressMask|ButtonReleaseMask
|EnterWindowMask|LeaveWindowMask|KeyPressMask
|KeyReleaseMask|PointerMotionMask|VirtualEventMask)) {
Tk_DeleteBinding(interp, canvasPtr->bindingTable,
object, Tcl_GetString(objv[3]));
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"requested illegal events; only key, button, motion,"
" enter, leave, and virtual events may be used", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "BAD_EVENTS", NULL);
result = TCL_ERROR;
goto done;
}
} else if (objc == 4) {
const char *command;
command = Tk_GetBinding(interp, canvasPtr->bindingTable,
object, Tcl_GetString(objv[3]));
if (command == NULL) {
const char *string = Tcl_GetString(Tcl_GetObjResult(interp));
/*
* Ignore missing binding errors. This is a special hack that
* relies on the error message returned by FindSequence in
* tkBind.c.
*/
if (string[0] != '\0') {
result = TCL_ERROR;
goto done;
}
Tcl_ResetResult(interp);
} else {
Tcl_SetObjResult(interp, Tcl_NewStringObj(command, -1));
}
} else {
Tk_GetAllBindings(interp, canvasPtr->bindingTable, object);
}
break;
}
case CANV_CANVASX: {
int x;
double grid;
if ((objc < 3) || (objc > 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "screenx ?gridspacing?");
result = TCL_ERROR;
goto done;
}
if (Tk_GetPixelsFromObj(interp, canvasPtr->tkwin, objv[2],
&x) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
if (objc == 4) {
if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[3], &grid) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
} else {
grid = 0.0;
}
x += canvasPtr->xOrigin;
Tcl_SetObjResult(interp, Tcl_NewDoubleObj(GridAlign((double)x,grid)));
break;
}
case CANV_CANVASY: {
int y;
double grid;
if ((objc < 3) || (objc > 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "screeny ?gridspacing?");
result = TCL_ERROR;
goto done;
}
if (Tk_GetPixelsFromObj(interp, canvasPtr->tkwin, objv[2],
&y) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
if (objc == 4) {
if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[3], &grid) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
} else {
grid = 0.0;
}
y += canvasPtr->yOrigin;
Tcl_SetObjResult(interp, Tcl_NewDoubleObj(GridAlign((double)y,grid)));
break;
}
case CANV_CGET:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "option");
result = TCL_ERROR;
goto done;
}
result = Tk_ConfigureValue(interp, canvasPtr->tkwin, configSpecs,
(char *) canvasPtr, Tcl_GetString(objv[2]), 0);
break;
case CANV_CONFIGURE:
if (objc == 2) {
result = Tk_ConfigureInfo(interp, canvasPtr->tkwin, configSpecs,
(char *) canvasPtr, NULL, 0);
} else if (objc == 3) {
result = Tk_ConfigureInfo(interp, canvasPtr->tkwin, configSpecs,
(char *) canvasPtr, Tcl_GetString(objv[2]), 0);
} else {
result = ConfigureCanvas(interp, canvasPtr, objc-2, objv+2,
TK_CONFIG_ARGV_ONLY);
}
break;
case CANV_COORDS:
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?x y x y ...?");
result = TCL_ERROR;
goto done;
}
FIRST_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done);
if (itemPtr != NULL) {
if (objc != 3) {
EventuallyRedrawItem(canvasPtr, itemPtr);
}
result = ItemCoords(canvasPtr, itemPtr, objc-3, objv+3);
if (objc != 3) {
EventuallyRedrawItem(canvasPtr, itemPtr);
}
}
break;
case CANV_IMOVE: {
double ignored;
Tcl_Obj *tmpObj;
if (objc != 6) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId index x y");
result = TCL_ERROR;
goto done;
}
if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[4], &ignored) != TCL_OK
|| Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[5], &ignored) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
/*
* Make a temporary object here that we can reuse for all the
* modifications in the loop.
*/
tmpObj = Tcl_NewListObj(2, objv+4);
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto doneImove) {
int index;
int x1, x2, y1, y2;
int dontRedraw1, dontRedraw2;
/*
* The TK_MOVABLE_POINTS flag should only be set for types that
* support the same semantics of index, dChars and insert methods
* as lines and canvases.
*/
if (itemPtr == NULL ||
!(itemPtr->typePtr->alwaysRedraw & TK_MOVABLE_POINTS)) {
continue;
}
result = ItemIndex(canvasPtr, itemPtr, objv[3], &index);
if (result != TCL_OK) {
break;
}
/*
* Redraw both item's old and new areas: it's possible that a
* replace could result in a new area larger than the old area.
* Except if the dCharsProc or insertProc sets the
* TK_ITEM_DONT_REDRAW flag, nothing more needs to be done.
*/
x1 = itemPtr->x1; y1 = itemPtr->y1;
x2 = itemPtr->x2; y2 = itemPtr->y2;
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
ItemDelChars(canvasPtr, itemPtr, index, index);
dontRedraw1 = itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW;
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
ItemInsert(canvasPtr, itemPtr, index, tmpObj);
dontRedraw2 = itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW;
if (!(dontRedraw1 && dontRedraw2)) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
x1, y1, x2, y2);
EventuallyRedrawItem(canvasPtr, itemPtr);
}
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
}
doneImove:
Tcl_DecrRefCount(tmpObj);
break;
}
case CANV_CREATE: {
Tk_ItemType *typePtr;
Tk_ItemType *matchPtr = NULL;
Tk_Item *itemPtr;
int isNew = 0;
Tcl_HashEntry *entryPtr;
const char *arg;
TkSizeT length;
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "type coords ?arg ...?");
result = TCL_ERROR;
goto done;
}
arg = TkGetStringFromObj(objv[2], &length);
c = arg[0];
/*
* Lock because the list of types is a global resource that could be
* updated by another thread. That's fairly unlikely, but not
* impossible.
*/
Tcl_MutexLock(&typeListMutex);
for (typePtr = typeList; typePtr != NULL; typePtr = typePtr->nextPtr){
if ((c == typePtr->name[0])
&& (!strncmp(arg, typePtr->name, length))) {
if (matchPtr != NULL) {
Tcl_MutexUnlock(&typeListMutex);
goto badType;
}
matchPtr = typePtr;
}
}
/*
* Can unlock now because we no longer look at the fields of the
* matched item type that are potentially modified by other threads.
*/
Tcl_MutexUnlock(&typeListMutex);
if (matchPtr == NULL) {
badType:
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"unknown or ambiguous item type \"%s\"", arg));
Tcl_SetErrorCode(interp, "TK", "LOOKUP", "CANVAS_ITEM_TYPE", arg,
NULL);
result = TCL_ERROR;
goto done;
}
if (objc < 4) {
/*
* Allow more specific error return.
*/
Tcl_WrongNumArgs(interp, 3, objv, "coords ?arg ...?");
result = TCL_ERROR;
goto done;
}
typePtr = matchPtr;
itemPtr = ckalloc(typePtr->itemSize);
itemPtr->id = canvasPtr->nextId;
canvasPtr->nextId++;
itemPtr->tagPtr = itemPtr->staticTagSpace;
itemPtr->tagSpace = TK_TAG_SPACE;
itemPtr->numTags = 0;
itemPtr->typePtr = typePtr;
itemPtr->state = TK_STATE_NULL;
itemPtr->redraw_flags = 0;
if (ItemCreate(canvasPtr, itemPtr, objc, objv) != TCL_OK) {
ckfree(itemPtr);
result = TCL_ERROR;
goto done;
}
itemPtr->nextPtr = NULL;
entryPtr = Tcl_CreateHashEntry(&canvasPtr->idTable,
INT2PTR(itemPtr->id), &isNew);
Tcl_SetHashValue(entryPtr, itemPtr);
itemPtr->prevPtr = canvasPtr->lastItemPtr;
canvasPtr->hotPtr = itemPtr;
canvasPtr->hotPrevPtr = canvasPtr->lastItemPtr;
if (canvasPtr->lastItemPtr == NULL) {
canvasPtr->firstItemPtr = itemPtr;
} else {
canvasPtr->lastItemPtr->nextPtr = itemPtr;
}
canvasPtr->lastItemPtr = itemPtr;
itemPtr->redraw_flags |= FORCE_REDRAW;
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(itemPtr->id));
break;
}
case CANV_DCHARS: {
int first, last;
int x1, x2, y1, y2;
if ((objc != 4) && (objc != 5)) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId first ?last?");
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->dCharsProc == NULL)) {
continue;
}
result = ItemIndex(canvasPtr, itemPtr, objv[3], &first);
if (result != TCL_OK) {
goto done;
}
if (objc == 5) {
result = ItemIndex(canvasPtr, itemPtr, objv[4], &last);
if (result != TCL_OK) {
goto done;
}
} else {
last = first;
}
/*
* Redraw both item's old and new areas: it's possible that a
* delete could result in a new area larger than the old area.
* Except if the dCharsProc sets the TK_ITEM_DONT_REDRAW flag,
* nothing more needs to be done.
*/
x1 = itemPtr->x1; y1 = itemPtr->y1;
x2 = itemPtr->x2; y2 = itemPtr->y2;
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
ItemDelChars(canvasPtr, itemPtr, first, last);
if (!(itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW)) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
x1, y1, x2, y2);
EventuallyRedrawItem(canvasPtr, itemPtr);
}
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
}
break;
}
case CANV_DELETE: {
int i;
Tcl_HashEntry *entryPtr;
for (i = 2; i < objc; i++) {
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[i], &searchPtr, goto done) {
EventuallyRedrawItem(canvasPtr, itemPtr);
if (canvasPtr->bindingTable != NULL) {
Tk_DeleteAllBindings(canvasPtr->bindingTable, itemPtr);
}
ItemDelete(canvasPtr, itemPtr);
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree(itemPtr->tagPtr);
}
entryPtr = Tcl_FindHashEntry(&canvasPtr->idTable,
INT2PTR(itemPtr->id));
Tcl_DeleteHashEntry(entryPtr);
if (itemPtr->nextPtr != NULL) {
itemPtr->nextPtr->prevPtr = itemPtr->prevPtr;
}
if (itemPtr->prevPtr != NULL) {
itemPtr->prevPtr->nextPtr = itemPtr->nextPtr;
}
if (canvasPtr->firstItemPtr == itemPtr) {
canvasPtr->firstItemPtr = itemPtr->nextPtr;
if (canvasPtr->firstItemPtr == NULL) {
canvasPtr->lastItemPtr = NULL;
}
}
if (canvasPtr->lastItemPtr == itemPtr) {
canvasPtr->lastItemPtr = itemPtr->prevPtr;
}
ckfree(itemPtr);
if (itemPtr == canvasPtr->currentItemPtr) {
canvasPtr->currentItemPtr = NULL;
canvasPtr->flags |= REPICK_NEEDED;
}
if (itemPtr == canvasPtr->newCurrentPtr) {
canvasPtr->newCurrentPtr = NULL;
canvasPtr->flags |= REPICK_NEEDED;
}
if (itemPtr == canvasPtr->textInfo.focusItemPtr) {
canvasPtr->textInfo.focusItemPtr = NULL;
}
if (itemPtr == canvasPtr->textInfo.selItemPtr) {
canvasPtr->textInfo.selItemPtr = NULL;
}
if ((itemPtr == canvasPtr->hotPtr)
|| (itemPtr == canvasPtr->hotPrevPtr)) {
canvasPtr->hotPtr = NULL;
}
}
}
break;
}
case CANV_DTAG: {
Tk_Uid tag;
int i;
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?tagToDelete?");
result = TCL_ERROR;
goto done;
}
if (objc == 4) {
tag = Tk_GetUid(Tcl_GetString(objv[3]));
} else {
tag = Tk_GetUid(Tcl_GetString(objv[2]));
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
for (i = itemPtr->numTags-1; i >= 0; i--) {
if (itemPtr->tagPtr[i] == tag) {
itemPtr->tagPtr[i] = itemPtr->tagPtr[itemPtr->numTags-1];
itemPtr->numTags--;
}
}
}
break;
}
case CANV_FIND:
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "searchCommand ?arg ...?");
result = TCL_ERROR;
goto done;
}
result = FIND_ITEMS(NULL, 2);
break;
case CANV_FOCUS:
if (objc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?tagOrId?");
result = TCL_ERROR;
goto done;
}
itemPtr = canvasPtr->textInfo.focusItemPtr;
if (objc == 2) {
if (itemPtr != NULL) {
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(itemPtr->id));
}
goto done;
}
if (canvasPtr->textInfo.gotFocus) {
EventuallyRedrawItem(canvasPtr, itemPtr);
}
if (Tcl_GetString(objv[2])[0] == 0) {
canvasPtr->textInfo.focusItemPtr = NULL;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if (itemPtr->typePtr->icursorProc != NULL) {
break;
}
}
if (itemPtr == NULL) {
goto done;
}
canvasPtr->textInfo.focusItemPtr = itemPtr;
if (canvasPtr->textInfo.gotFocus) {
EventuallyRedrawItem(canvasPtr, itemPtr);
}
break;
case CANV_GETTAGS:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId");
result = TCL_ERROR;
goto done;
}
FIRST_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done);
if (itemPtr != NULL) {
int i;
Tcl_Obj *resultObj = Tcl_NewObj();
for (i = 0; i < itemPtr->numTags; i++) {
Tcl_ListObjAppendElement(NULL, resultObj,
Tcl_NewStringObj(itemPtr->tagPtr[i], -1));
}
Tcl_SetObjResult(interp, resultObj);
}
break;
case CANV_ICURSOR: {
int index;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId index");
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->icursorProc == NULL)) {
goto done;
}
result = ItemIndex(canvasPtr, itemPtr, objv[3], &index);
if (result != TCL_OK) {
goto done;
}
ItemCursor(canvasPtr, itemPtr, index);
if ((itemPtr == canvasPtr->textInfo.focusItemPtr)
&& (canvasPtr->textInfo.cursorOn)) {
EventuallyRedrawItem(canvasPtr, itemPtr);
}
}
break;
}
case CANV_INDEX: {
int index;
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId string");
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if (itemPtr->typePtr->indexProc != NULL) {
break;
}
}
if (itemPtr == NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"can't find an indexable item \"%s\"",
Tcl_GetString(objv[2])));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "INDEXABLE_ITEM", NULL);
result = TCL_ERROR;
goto done;
}
result = ItemIndex(canvasPtr, itemPtr, objv[3], &index);
if (result != TCL_OK) {
goto done;
}
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(index));
break;
}
case CANV_INSERT: {
int beforeThis;
int x1, x2, y1, y2;
if (objc != 5) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId beforeThis string");
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->insertProc == NULL)) {
continue;
}
result = ItemIndex(canvasPtr, itemPtr, objv[3], &beforeThis);
if (result != TCL_OK) {
goto done;
}
/*
* Redraw both item's old and new areas: it's possible that an
* insertion could result in a new area either larger or smaller
* than the old area. Except if the insertProc sets the
* TK_ITEM_DONT_REDRAW flag, nothing more needs to be done.
*/
x1 = itemPtr->x1; y1 = itemPtr->y1;
x2 = itemPtr->x2; y2 = itemPtr->y2;
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
ItemInsert(canvasPtr, itemPtr, beforeThis, objv[4]);
if (!(itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW)) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
x1, y1, x2, y2);
EventuallyRedrawItem(canvasPtr, itemPtr);
}
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
}
break;
}
case CANV_ITEMCGET:
if (objc != 4) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId option");
result = TCL_ERROR;
goto done;
}
FIRST_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done);
if (itemPtr != NULL) {
result = ItemConfigValue(canvasPtr, itemPtr, objv[3]);
}
break;
case CANV_ITEMCONFIGURE:
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?-option value ...?");
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if (objc == 3) {
result = ItemConfigInfo(canvasPtr, itemPtr, NULL);
} else if (objc == 4) {
result = ItemConfigInfo(canvasPtr, itemPtr, objv[3]);
} else {
EventuallyRedrawItem(canvasPtr, itemPtr);
result = ItemConfigure(canvasPtr, itemPtr, objc-3, objv+3);
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
}
if ((result != TCL_OK) || (objc < 5)) {
break;
}
}
break;
case CANV_LOWER: {
Tk_Item *itemPtr;
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?belowThis?");
result = TCL_ERROR;
goto done;
}
/*
* First find the item just after which we'll insert the named items.
*/
if (objc == 3) {
itemPtr = NULL;
} else {
FIRST_CANVAS_ITEM_MATCHING(objv[3], &searchPtr, goto done);
if (itemPtr == NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"tagOrId \"%s\" doesn't match any items",
Tcl_GetString(objv[3])));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "ITEM", NULL);
result = TCL_ERROR;
goto done;
}
itemPtr = itemPtr->prevPtr;
}
RELINK_ITEMS(objv[2], itemPtr);
break;
}
case CANV_MOVE: {
double xAmount, yAmount;
if (objc != 5) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId xAmount yAmount");
result = TCL_ERROR;
goto done;
}
if ((Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr, objv[3],
&xAmount) != TCL_OK) || (Tk_CanvasGetCoordFromObj(interp,
(Tk_Canvas) canvasPtr, objv[4], &yAmount) != TCL_OK)) {
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
EventuallyRedrawItem(canvasPtr, itemPtr);
ItemTranslate(canvasPtr, itemPtr, xAmount, yAmount);
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
}
break;
}
case CANV_MOVETO: {
int xBlank, yBlank;
double xAmount, yAmount;
double oldX = 0, oldY = 0, newX, newY;
if (objc != 5) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId x y");
result = TCL_ERROR;
goto done;
}
xBlank = 0;
if (Tcl_GetString(objv[3])[0] == '\0') {
xBlank = 1;
} else if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[3], &newX) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
yBlank = 0;
if (Tcl_GetString(objv[4])[0] == '\0') {
yBlank = 1;
} else if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[4], &newY) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
FIRST_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done);
if (itemPtr != NULL) {
oldX = itemPtr->x1;
oldY = itemPtr->y1;
/*
* Calculate the displacement.
*/
if (xBlank) {
xAmount = 0;
} else {
xAmount = newX - oldX;
}
if (yBlank) {
yAmount = 0;
} else {
yAmount = newY - oldY;
}
/*
* Move the object(s).
*/
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
EventuallyRedrawItem(canvasPtr, itemPtr);
ItemTranslate(canvasPtr, itemPtr, xAmount, yAmount);
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
}
}
break;
}
case CANV_POSTSCRIPT: {
const char **args = TkGetStringsFromObjs(objc, objv);
result = TkCanvPostscriptCmd(canvasPtr, interp, objc, args);
if (args != NULL) {
ckfree(args);
}
break;
}
case CANV_RAISE: {
Tk_Item *prevPtr;
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId ?aboveThis?");
result = TCL_ERROR;
goto done;
}
/*
* First find the item just after which we'll insert the named items.
*/
if (objc == 3) {
prevPtr = canvasPtr->lastItemPtr;
} else {
prevPtr = NULL;
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[3], &searchPtr, goto done) {
prevPtr = itemPtr;
}
if (prevPtr == NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"tagOrId \"%s\" doesn't match any items",
Tcl_GetString(objv[3])));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "ITEM", NULL);
result = TCL_ERROR;
goto done;
}
}
RELINK_ITEMS(objv[2], prevPtr);
break;
}
case CANV_RCHARS: {
int first, last;
int x1, x2, y1, y2;
int dontRedraw1, dontRedraw2;
if (objc != 6) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId first last string");
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
if ((itemPtr->typePtr->indexProc == NULL)
|| (itemPtr->typePtr->dCharsProc == NULL)
|| (itemPtr->typePtr->insertProc == NULL)) {
continue;
}
result = ItemIndex(canvasPtr, itemPtr, objv[3], &first);
if (result != TCL_OK) {
goto done;
}
result = ItemIndex(canvasPtr, itemPtr, objv[4], &last);
if (result != TCL_OK) {
goto done;
}
/*
* Redraw both item's old and new areas: it's possible that a
* replace could result in a new area larger than the old area.
* Except if the dCharsProc or insertProc sets the
* TK_ITEM_DONT_REDRAW flag, nothing more needs to be done.
*/
x1 = itemPtr->x1; y1 = itemPtr->y1;
x2 = itemPtr->x2; y2 = itemPtr->y2;
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
ItemDelChars(canvasPtr, itemPtr, first, last);
dontRedraw1 = itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW;
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
ItemInsert(canvasPtr, itemPtr, first, objv[5]);
dontRedraw2 = itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW;
if (!(dontRedraw1 && dontRedraw2)) {
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
x1, y1, x2, y2);
EventuallyRedrawItem(canvasPtr, itemPtr);
}
itemPtr->redraw_flags &= ~TK_ITEM_DONT_REDRAW;
}
break;
}
case CANV_ROTATE: {
double x, y, angle;
Tk_Canvas canvas = (Tk_Canvas) canvasPtr;
if (objc != 6) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId x y angle");
result = TCL_ERROR;
goto done;
}
if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[3], &x) != TCL_OK ||
Tk_CanvasGetCoordFromObj(interp, canvas, objv[4], &y) != TCL_OK ||
Tcl_GetDoubleFromObj(interp, objv[5], &angle) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
angle = angle * 3.1415927 / 180.0;
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
EventuallyRedrawItem(canvasPtr, itemPtr);
ItemRotate(canvasPtr, itemPtr, x, y, angle);
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
}
break;
}
case CANV_SCALE: {
double xOrigin, yOrigin, xScale, yScale;
if (objc != 7) {
Tcl_WrongNumArgs(interp, 2, objv,
"tagOrId xOrigin yOrigin xScale yScale");
result = TCL_ERROR;
goto done;
}
if ((Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[3], &xOrigin) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[4], &yOrigin) != TCL_OK)
|| (Tcl_GetDoubleFromObj(interp, objv[5], &xScale)!=TCL_OK)
|| (Tcl_GetDoubleFromObj(interp, objv[6], &yScale)!=TCL_OK)) {
result = TCL_ERROR;
goto done;
}
if ((xScale == 0.0) || (yScale == 0.0)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"scale factor cannot be zero", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "BAD_SCALE", NULL);
result = TCL_ERROR;
goto done;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done) {
EventuallyRedrawItem(canvasPtr, itemPtr);
ItemScale(canvasPtr, itemPtr, xOrigin, yOrigin, xScale, yScale);
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
}
break;
}
case CANV_SCAN: {
int x, y, gain = 10;
static const char *const optionStrings[] = {
"mark", "dragto", NULL
};
if (objc < 5) {
Tcl_WrongNumArgs(interp, 2, objv, "mark|dragto x y ?dragGain?");
result = TCL_ERROR;
} else if (Tcl_GetIndexFromObj(interp, objv[2], optionStrings,
"scan option", 0, &index) != TCL_OK) {
result = TCL_ERROR;
} else if ((objc != 5) && (objc != 5+index)) {
Tcl_WrongNumArgs(interp, 3, objv, index?"x y ?gain?":"x y");
result = TCL_ERROR;
} else if ((Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK)
|| (Tcl_GetIntFromObj(interp, objv[4], &y) != TCL_OK)){
result = TCL_ERROR;
} else if ((objc == 6) &&
(Tcl_GetIntFromObj(interp, objv[5], &gain) != TCL_OK)) {
result = TCL_ERROR;
} else if (!index) {
canvasPtr->scanX = x;
canvasPtr->scanXOrigin = canvasPtr->xOrigin;
canvasPtr->scanY = y;
canvasPtr->scanYOrigin = canvasPtr->yOrigin;
} else {
int newXOrigin, newYOrigin, tmp;
/*
* Compute a new view origin for the canvas, amplifying the
* mouse motion.
*/
tmp = canvasPtr->scanXOrigin - gain*(x - canvasPtr->scanX)
- canvasPtr->scrollX1;
newXOrigin = canvasPtr->scrollX1 + tmp;
tmp = canvasPtr->scanYOrigin - gain*(y - canvasPtr->scanY)
- canvasPtr->scrollY1;
newYOrigin = canvasPtr->scrollY1 + tmp;
CanvasSetOrigin(canvasPtr, newXOrigin, newYOrigin);
}
break;
}
case CANV_SELECT: {
int index, optionindex;
static const char *const optionStrings[] = {
"adjust", "clear", "from", "item", "to", NULL
};
enum options {
CANV_ADJUST, CANV_CLEAR, CANV_FROM, CANV_ITEM, CANV_TO
};
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "option ?tagOrId? ?arg?");
result = TCL_ERROR;
goto done;
}
if (objc >= 4) {
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[3], &searchPtr, goto done) {
if ((itemPtr->typePtr->indexProc != NULL)
&& (itemPtr->typePtr->selectionProc != NULL)){
break;
}
}
if (itemPtr == NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"can't find an indexable and selectable item \"%s\"",
Tcl_GetString(objv[3])));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SELECTABLE_ITEM",
NULL);
result = TCL_ERROR;
goto done;
}
}
if (objc == 5) {
result = ItemIndex(canvasPtr, itemPtr, objv[4], &index);
if (result != TCL_OK) {
goto done;
}
}
if (Tcl_GetIndexFromObj(interp, objv[2], optionStrings,
"select option", 0, &optionindex) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
switch ((enum options) optionindex) {
case CANV_ADJUST:
if (objc != 5) {
Tcl_WrongNumArgs(interp, 3, objv, "tagOrId index");
result = TCL_ERROR;
goto done;
}
if (canvasPtr->textInfo.selItemPtr == itemPtr) {
if (index < (canvasPtr->textInfo.selectFirst
+ canvasPtr->textInfo.selectLast)/2) {
canvasPtr->textInfo.selectAnchor =
canvasPtr->textInfo.selectLast + 1;
} else {
canvasPtr->textInfo.selectAnchor =
canvasPtr->textInfo.selectFirst;
}
}
CanvasSelectTo(canvasPtr, itemPtr, index);
break;
case CANV_CLEAR:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 3, objv, NULL);
result = TCL_ERROR;
goto done;
}
EventuallyRedrawItem(canvasPtr, canvasPtr->textInfo.selItemPtr);
canvasPtr->textInfo.selItemPtr = NULL;
break;
case CANV_FROM:
if (objc != 5) {
Tcl_WrongNumArgs(interp, 3, objv, "tagOrId index");
result = TCL_ERROR;
goto done;
}
canvasPtr->textInfo.anchorItemPtr = itemPtr;
canvasPtr->textInfo.selectAnchor = index;
break;
case CANV_ITEM:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 3, objv, NULL);
result = TCL_ERROR;
goto done;
}
if (canvasPtr->textInfo.selItemPtr != NULL) {
Tcl_SetObjResult(interp,
Tcl_NewWideIntObj(canvasPtr->textInfo.selItemPtr->id));
}
break;
case CANV_TO:
if (objc != 5) {
Tcl_WrongNumArgs(interp, 2, objv, "tagOrId index");
result = TCL_ERROR;
goto done;
}
CanvasSelectTo(canvasPtr, itemPtr, index);
break;
}
break;
}
case CANV_TYPE:
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "tag");
result = TCL_ERROR;
goto done;
}
FIRST_CANVAS_ITEM_MATCHING(objv[2], &searchPtr, goto done);
if (itemPtr != NULL) {
Tcl_SetObjResult(interp,
Tcl_NewStringObj(itemPtr->typePtr->name, -1));
}
break;
case CANV_XVIEW: {
int count, type;
int newX = 0; /* Initialization needed only to prevent gcc
* warnings. */
double fraction;
const char **args;
if (objc == 2) {
Tcl_SetObjResult(interp, ScrollFractions(
canvasPtr->xOrigin + canvasPtr->inset,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin)
- canvasPtr->inset, canvasPtr->scrollX1,
canvasPtr->scrollX2));
break;
}
args = TkGetStringsFromObjs(objc, objv);
type = Tk_GetScrollInfo(interp, objc, args, &fraction, &count);
if (args != NULL) {
ckfree(args);
}
switch (type) {
case TK_SCROLL_ERROR:
result = TCL_ERROR;
goto done;
case TK_SCROLL_MOVETO:
newX = canvasPtr->scrollX1 - canvasPtr->inset
+ (int) (fraction * (canvasPtr->scrollX2
- canvasPtr->scrollX1) + 0.5);
break;
case TK_SCROLL_PAGES:
newX = (int) (canvasPtr->xOrigin + count * .9
* (Tk_Width(canvasPtr->tkwin) - 2*canvasPtr->inset));
break;
case TK_SCROLL_UNITS:
if (canvasPtr->xScrollIncrement > 0) {
newX = canvasPtr->xOrigin + count*canvasPtr->xScrollIncrement;
} else {
newX = (int) (canvasPtr->xOrigin + count * .1
* (Tk_Width(canvasPtr->tkwin) - 2*canvasPtr->inset));
}
break;
}
CanvasSetOrigin(canvasPtr, newX, canvasPtr->yOrigin);
break;
}
case CANV_YVIEW: {
int count, type;
int newY = 0; /* Initialization needed only to prevent gcc
* warnings. */
double fraction;
const char **args;
if (objc == 2) {
Tcl_SetObjResult(interp, ScrollFractions(
canvasPtr->yOrigin + canvasPtr->inset,
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin)
- canvasPtr->inset,
canvasPtr->scrollY1, canvasPtr->scrollY2));
break;
}
args = TkGetStringsFromObjs(objc, objv);
type = Tk_GetScrollInfo(interp, objc, args, &fraction, &count);
if (args != NULL) {
ckfree(args);
}
switch (type) {
case TK_SCROLL_ERROR:
result = TCL_ERROR;
goto done;
case TK_SCROLL_MOVETO:
newY = canvasPtr->scrollY1 - canvasPtr->inset + (int) (
fraction*(canvasPtr->scrollY2-canvasPtr->scrollY1) + 0.5);
break;
case TK_SCROLL_PAGES:
newY = (int) (canvasPtr->yOrigin + count * .9
* (Tk_Height(canvasPtr->tkwin) - 2*canvasPtr->inset));
break;
case TK_SCROLL_UNITS:
if (canvasPtr->yScrollIncrement > 0) {
newY = canvasPtr->yOrigin + count*canvasPtr->yScrollIncrement;
} else {
newY = (int) (canvasPtr->yOrigin + count * .1
* (Tk_Height(canvasPtr->tkwin) - 2*canvasPtr->inset));
}
break;
}
CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, newY);
break;
}
case CANV_IMAGE: {
Tk_PhotoHandle photohandle;
int subsample = 1, zoom = 1;
if (objc < 3 || objc > 5) {
Tcl_WrongNumArgs(interp, 2, objv, "imagename ?subsample? ?zoom?");
result = TCL_ERROR;
goto done;
}
if ((photohandle = Tk_FindPhoto(interp, Tcl_GetString(objv[2]) )) == 0) {
result = TCL_ERROR;
goto done;
}
/*
* If we are given a subsample or a zoom then grab them.
*/
if (objc >= 4 && Tcl_GetIntFromObj(interp, objv[3], &subsample) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
if (objc >= 5 && Tcl_GetIntFromObj(interp, objv[4], &zoom) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
/*
* Set the image size to zero, which allows the DrawCanvas() function
* to expand the image automatically when it copies the pixmap into it.
*/
if (Tk_PhotoSetSize(interp, photohandle, 0, 0) != TCL_OK) {
result = TCL_ERROR;
goto done;
}
result = DrawCanvas(interp, clientData, photohandle, subsample, zoom);
}
}
done:
TagSearchDestroy(searchPtr);
Tcl_Release(canvasPtr);
return result;
}
/*
*----------------------------------------------------------------------
*
* DestroyCanvas --
*
* This function is invoked by Tcl_EventuallyFree or Tcl_Release to clean
* up the internal structure of a canvas at a safe time (when no-one is
* using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the canvas is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyCanvas(
void *memPtr) /* Info about canvas widget. */
{
TkCanvas *canvasPtr = memPtr;
Tk_Item *itemPtr;
TagSearchExpr *expr, *next;
/*
* Free up all of the items in the canvas.
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = canvasPtr->firstItemPtr) {
canvasPtr->firstItemPtr = itemPtr->nextPtr;
ItemDelete(canvasPtr, itemPtr);
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree(itemPtr->tagPtr);
}
ckfree(itemPtr);
}
/*
* Free up all the stuff that requires special handling, then let
* Tk_FreeOptions handle all the standard option-related stuff.
*/
Tcl_DeleteHashTable(&canvasPtr->idTable);
if (canvasPtr->pixmapGC != NULL) {
Tk_FreeGC(canvasPtr->display, canvasPtr->pixmapGC);
}
expr = canvasPtr->bindTagExprs;
while (expr) {
next = expr->next;
TagSearchExprDestroy(expr);
expr = next;
}
Tcl_DeleteTimerHandler(canvasPtr->insertBlinkHandler);
if (canvasPtr->bindingTable != NULL) {
Tk_DeleteBindingTable(canvasPtr->bindingTable);
}
Tk_FreeOptions(configSpecs, (char *) canvasPtr, canvasPtr->display, 0);
canvasPtr->tkwin = NULL;
ckfree(canvasPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureCanvas --
*
* This function is called to process an objv/objc list, plus the Tk
* option database, in order to configure (or reconfigure) a canvas
* widget.
*
* Results:
* The return value is a standard Tcl result. If TCL_ERROR is returned,
* then the interp's result contains an error message.
*
* Side effects:
* Configuration information, such as colors, border width, etc. get set
* for canvasPtr; old resources get freed, if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureCanvas(
Tcl_Interp *interp, /* Used for error reporting. */
TkCanvas *canvasPtr, /* Information about widget; may or may not
* already have values for some fields. */
int objc, /* Number of valid entries in objv. */
Tcl_Obj *const objv[], /* Argument objects. */
int flags) /* Flags to pass to Tk_ConfigureWidget. */
{
XGCValues gcValues;
GC newGC;
Tk_State old_canvas_state=canvasPtr->canvas_state;
if (Tk_ConfigureWidget(interp, canvasPtr->tkwin, configSpecs,
objc, (const char **) objv, (char *) canvasPtr,
flags|TK_CONFIG_OBJS) != TCL_OK) {
return TCL_ERROR;
}
/*
* A few options need special processing, such as setting the background
* from a 3-D border and creating a GC for copying bits to the screen.
*/
Tk_SetBackgroundFromBorder(canvasPtr->tkwin, canvasPtr->bgBorder);
if (canvasPtr->highlightWidth < 0) {
canvasPtr->highlightWidth = 0;
}
canvasPtr->inset = canvasPtr->borderWidth + canvasPtr->highlightWidth;
gcValues.function = GXcopy;
gcValues.graphics_exposures = False;
gcValues.foreground = Tk_3DBorderColor(canvasPtr->bgBorder)->pixel;
newGC = Tk_GetGC(canvasPtr->tkwin,
GCFunction|GCGraphicsExposures|GCForeground, &gcValues);
if (canvasPtr->pixmapGC != NULL) {
Tk_FreeGC(canvasPtr->display, canvasPtr->pixmapGC);
}
canvasPtr->pixmapGC = newGC;
/*
* Reconfigure items to reflect changed state disabled/normal.
*/
if ( old_canvas_state != canvasPtr->canvas_state ) {
Tk_Item *itemPtr;
int result;
for ( itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ( itemPtr->state == TK_STATE_NULL ) {
result = (*itemPtr->typePtr->configProc)(canvasPtr->interp,
(Tk_Canvas) canvasPtr, itemPtr, 0, NULL,
TK_CONFIG_ARGV_ONLY);
if (result != TCL_OK) {
Tcl_ResetResult(canvasPtr->interp);
}
}
}
}
/*
* Reset the desired dimensions for the window.
*/
Tk_GeometryRequest(canvasPtr->tkwin, canvasPtr->width + 2*canvasPtr->inset,
canvasPtr->height + 2*canvasPtr->inset);
/*
* Restart the cursor timing sequence in case the on-time or off-time just
* changed.
*/
if (canvasPtr->textInfo.gotFocus) {
CanvasFocusProc(canvasPtr, 1);
}
/*
* Recompute the scroll region.
*/
canvasPtr->scrollX1 = 0;
canvasPtr->scrollY1 = 0;
canvasPtr->scrollX2 = 0;
canvasPtr->scrollY2 = 0;
if (canvasPtr->regionString != NULL) {
int argc2;
const char **argv2;
if (Tcl_SplitList(canvasPtr->interp, canvasPtr->regionString,
&argc2, &argv2) != TCL_OK) {
return TCL_ERROR;
}
if (argc2 != 4) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"bad scrollRegion \"%s\"", canvasPtr->regionString));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SCROLL_REGION", NULL);
badRegion:
ckfree(canvasPtr->regionString);
ckfree(argv2);
canvasPtr->regionString = NULL;
return TCL_ERROR;
}
if ((Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[0], &canvasPtr->scrollX1) != TCL_OK)
|| (Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[1], &canvasPtr->scrollY1) != TCL_OK)
|| (Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[2], &canvasPtr->scrollX2) != TCL_OK)
|| (Tk_GetPixels(canvasPtr->interp, canvasPtr->tkwin,
argv2[3], &canvasPtr->scrollY2) != TCL_OK)) {
goto badRegion;
}
ckfree(argv2);
}
flags = canvasPtr->tsoffset.flags;
if (flags & TK_OFFSET_LEFT) {
canvasPtr->tsoffset.xoffset = 0;
} else if (flags & TK_OFFSET_CENTER) {
canvasPtr->tsoffset.xoffset = canvasPtr->width/2;
} else if (flags & TK_OFFSET_RIGHT) {
canvasPtr->tsoffset.xoffset = canvasPtr->width;
}
if (flags & TK_OFFSET_TOP) {
canvasPtr->tsoffset.yoffset = 0;
} else if (flags & TK_OFFSET_MIDDLE) {
canvasPtr->tsoffset.yoffset = canvasPtr->height/2;
} else if (flags & TK_OFFSET_BOTTOM) {
canvasPtr->tsoffset.yoffset = canvasPtr->height;
}
/*
* Reset the canvas's origin (this is a no-op unless confine mode has just
* been turned on or the scroll region has changed).
*/
CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, canvasPtr->yOrigin);
canvasPtr->flags |= UPDATE_SCROLLBARS|REDRAW_BORDERS;
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* CanvasWorldChanged --
*
* This function is called when the world has changed in some way and the
* widget needs to recompute all its graphics contexts and determine its
* new geometry.
*
* Results:
* None.
*
* Side effects:
* Configures all items in the canvas with a empty argc/argv, for the
* side effect of causing all the items to recompute their geometry and
* to be redisplayed.
*
*----------------------------------------------------------------------
*/
static void
CanvasWorldChanged(
ClientData instanceData) /* Information about widget. */
{
TkCanvas *canvasPtr = instanceData;
Tk_Item *itemPtr;
itemPtr = canvasPtr->firstItemPtr;
for ( ; itemPtr != NULL; itemPtr = itemPtr->nextPtr) {
if (ItemConfigure(canvasPtr, itemPtr, 0, NULL) != TCL_OK) {
Tcl_ResetResult(canvasPtr->interp);
}
}
canvasPtr->flags |= REPICK_NEEDED;
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
}
/*
*----------------------------------------------------------------------
*
* DecomposeMaskToShiftAndBits --
*
* Given a 32 bit pixel mask, we find the position of the lowest bit and the
* width of the mask bits.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
DecomposeMaskToShiftAndBits(
unsigned long mask, /* The pixel mask to examine */
int *shift, /* Where to put the shift count (position of lowest bit) */
int *bits) /* Where to put the bit count (width of the pixel mask) */
{
int i;
*shift = 0;
*bits = 0;
/*
* Find the lowest '1' bit in the mask.
*/
for (i = 0; i < 32; ++i) {
if (mask & 1 << i)
break;
}
if (i < 32) {
*shift = i;
/*
* Now find the next '0' bit and the width of the mask.
*/
for ( ; i < 32; ++i) {
if ((mask & 1 << i) == 0)
break;
else
++*bits;
}
/*
* Limit to the top 8 bits if the mask was wider than 8.
*/
if (*bits > 8) {
*shift += *bits - 8;
*bits = 8;
}
}
}
/*
*----------------------------------------------------------------------
*
* DrawCanvas --
*
* This function draws the contents of a canvas into the given Photo image.
* This function is called from the widget "image" subcommand.
* The canvas does not need to be mapped (one of it's ancestors must be)
* in order for this function to work.
*
* Results:
* None.
*
* Side effects:
* Canvas contents from within the -scrollregion or widget size are rendered
* into the Photo. Any errors are left in the result.
*
*----------------------------------------------------------------------
*/
#define OVERDRAW_PIXELS 32 /* How much larger we make the pixmap
* that the canvas objects are drawn into */
/* From stackoverflow.com/questions/2100331/c-macro-definition-to-determine-big-endian-or-little-endian-machine */
#define IS_BIG_ENDIAN (*(unsigned short *)"\0\xff" < 0x100)
#define BYTE_SWAP16(n) ((((unsigned short)n)>>8) | (((unsigned short)n)<<8))
#define BYTE_SWAP32(n) (((n>>24)&0x000000FF) | ((n<<8)&0x00FF0000) | ((n>>8)&0x0000FF00) | ((n<<24)&0xFF000000))
static int
DrawCanvas(
Tcl_Interp *interp, /* As passed to the widget command, and we will leave errors here */
ClientData clientData,
Tk_PhotoHandle photohandle, /* The photo we are rendering into */
int subsample, /* If either subsample or zoom are not 1 then we call Tk_PhotoPutZoomedBlock() */
int zoom)
{
TkCanvas * canvasPtr = clientData;
Tk_Window tkwin;
Display *displayPtr;
Tk_PhotoImageBlock blockPtr = {0};
Window wid;
Tk_Item * itemPtr;
Pixmap pixmap = 0;
XImage *ximagePtr = NULL;
Visual *visualPtr;
GC xgc = 0;
XGCValues xgcValues;
int canvasX1, canvasY1, canvasX2, canvasY2, cWidth, cHeight,
pixmapX1, pixmapY1, pixmapX2, pixmapY2, pmWidth, pmHeight,
bitsPerPixel, bytesPerPixel, x, y, result = TCL_OK,
rshift, gshift, bshift, rbits, gbits, bbits;
#ifdef DEBUG_DRAWCANVAS
char buffer[128];
#endif
if ((tkwin = canvasPtr->tkwin) == NULL) {
Tcl_AppendResult(interp, "canvas tkwin is NULL!", NULL);
result = TCL_ERROR;
goto done;
}
/*
* If this canvas is unmapped, then we won't have a window id, so we will
* try the ancestors of the canvas until we find a window that has a
* valid window id. The Tk_GetPixmap() call requires a valid window id.
*/
do {
if ((displayPtr = Tk_Display(tkwin)) == NULL) {
Tcl_AppendResult(interp, "canvas (or parent) display is NULL!", NULL);
result = TCL_ERROR;
goto done;
}
if ((wid = Tk_WindowId(tkwin)) != 0) {
continue;
}
if ((tkwin = Tk_Parent(tkwin)) == NULL) {
Tcl_AppendResult(interp, "canvas has no parent with a valid window id! Is the toplevel window mapped?", NULL);
result = TCL_ERROR;
goto done;
}
} while (wid == 0);
bitsPerPixel = Tk_Depth(tkwin);
visualPtr = Tk_Visual(tkwin);
if (subsample == 0) {
Tcl_AppendResult(interp, "subsample cannot be zero", NULL);
result = TCL_ERROR;
goto done;
}
/*
* Scan through the item list, registering the bounding box for all items
* that didn't do that for the final coordinates yet. This can be
* determined by the FORCE_REDRAW flag.
*/
for (itemPtr = canvasPtr -> firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr -> nextPtr) {
if (itemPtr -> redraw_flags & FORCE_REDRAW) {
itemPtr -> redraw_flags &= ~FORCE_REDRAW;
EventuallyRedrawItem(canvasPtr, itemPtr);
itemPtr -> redraw_flags &= ~FORCE_REDRAW;
}
}
/*
* The DisplayCanvas() function works out the region that needs redrawing,
* but we don't do this. We grab the whole scrollregion or canvas window
* area. If we have a defined -scrollregion we use that as the drawing
* region, otherwise use the canvas window height and width with an origin
* of 0,0.
*/
if (canvasPtr->scrollX1 != 0 || canvasPtr->scrollY1 != 0 ||
canvasPtr->scrollX2 != 0 || canvasPtr->scrollY2 != 0) {
canvasX1 = canvasPtr->scrollX1;
canvasY1 = canvasPtr->scrollY1;
canvasX2 = canvasPtr->scrollX2;
canvasY2 = canvasPtr->scrollY2;
cWidth = canvasX2 - canvasX1 + 1;
cHeight = canvasY2 - canvasY1 + 1;
} else {
cWidth = Tk_Width(tkwin);
cHeight = Tk_Height(tkwin);
canvasX1 = 0;
canvasY1 = 0;
canvasX2 = canvasX1 + cWidth - 1;
canvasY2 = canvasY1 + cHeight - 1;
}
/*
* Allocate a pixmap to draw into. We add OVERDRAW_PIXELS in the same way
* that DisplayCanvas() does to avoid problems on some systems when objects
* are being drawn too close to the edge.
*/
pixmapX1 = canvasX1 - OVERDRAW_PIXELS;
pixmapY1 = canvasY1 - OVERDRAW_PIXELS;
pixmapX2 = canvasX2 + OVERDRAW_PIXELS;
pixmapY2 = canvasY2 + OVERDRAW_PIXELS;
pmWidth = pixmapX2 - pixmapX1 + 1;
pmHeight = pixmapY2 - pixmapY1 + 1;
if ((pixmap = Tk_GetPixmap(displayPtr, Tk_WindowId(tkwin), pmWidth, pmHeight,
bitsPerPixel)) == 0) {
Tcl_AppendResult(interp, "failed to create drawing Pixmap", NULL);
result = TCL_ERROR;
goto done;
}
/*
* Before we can draw the canvas objects into the pixmap it's background
* should be filled with canvas background colour.
*/
xgcValues.function = GXcopy;
xgcValues.foreground = Tk_3DBorderColor(canvasPtr->bgBorder)->pixel;
xgc = XCreateGC(displayPtr, pixmap, GCFunction|GCForeground, &xgcValues);
XFillRectangle(displayPtr,pixmap,xgc,0,0,pmWidth,pmHeight);
/*
* Draw all the cavas items into the pixmap
*/
canvasPtr->drawableXOrigin = pixmapX1;
canvasPtr->drawableYOrigin = pixmapY1;
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 >= pixmapX2) || (itemPtr->y1 >= pixmapY2) ||
(itemPtr->x2 < pixmapX1) || (itemPtr->y2 < pixmapY1)) {
if (!AlwaysRedraw(itemPtr)) {
continue;
}
}
if (itemPtr->state == TK_STATE_HIDDEN ||
(itemPtr->state == TK_STATE_NULL && canvasPtr->canvas_state
== TK_STATE_HIDDEN)) {
continue;
}
ItemDisplay(canvasPtr, itemPtr, pixmap, pixmapX1, pixmapY1, pmWidth,
pmHeight);
}
/*
* Copy the Pixmap into an ZPixmap format XImage so we can copy it across
* to the photo image. This seems to be the only way to get Pixmap image
* data out of an image. Note we have to account for the OVERDRAW_PIXELS
* border width.
*/
if ((ximagePtr = XGetImage(displayPtr, pixmap, -pixmapX1, -pixmapY1, cWidth,
cHeight, AllPlanes, ZPixmap)) == NULL) {
Tcl_AppendResult(interp, "failed to copy Pixmap to XImage", NULL);
result = TCL_ERROR;
goto done;
}
#ifdef DEBUG_DRAWCANVAS
Tcl_AppendResult(interp, "ximagePtr {", NULL);
sprintf(buffer,"%d",ximagePtr->width); Tcl_AppendResult(interp, " width ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->height); Tcl_AppendResult(interp, " height ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->xoffset); Tcl_AppendResult(interp, " xoffset ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->format); Tcl_AppendResult(interp, " format ", buffer, NULL);
Tcl_AppendResult(interp, " ximagePtr->data", NULL);
if (ximagePtr->data != NULL) {
int ix, iy;
Tcl_AppendResult(interp, " {", NULL);
for (iy = 0; iy < ximagePtr->height; ++ iy) {
Tcl_AppendResult(interp, " {", NULL);
for (ix = 0; ix < ximagePtr->bytes_per_line; ++ ix) {
if (ix > 0) {
if (ix % 4 == 0)
Tcl_AppendResult(interp, "-", NULL);
else
Tcl_AppendResult(interp, " ", NULL);
}
sprintf(buffer,"%2.2x",ximagePtr->data[ximagePtr->bytes_per_line * iy + ix]&0xFF);
Tcl_AppendResult(interp, buffer, NULL);
}
Tcl_AppendResult(interp, " }", NULL);
}
Tcl_AppendResult(interp, " }", NULL);
} else
sprintf(buffer," NULL");
sprintf(buffer,"%d",ximagePtr->byte_order); Tcl_AppendResult(interp, " byte_order ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->bitmap_unit); Tcl_AppendResult(interp, " bitmap_unit ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->bitmap_bit_order); Tcl_AppendResult(interp, " bitmap_bit_order ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->bitmap_pad); Tcl_AppendResult(interp, " bitmap_pad ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->depth); Tcl_AppendResult(interp, " depth ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->bytes_per_line); Tcl_AppendResult(interp, " bytes_per_line ", buffer, NULL);
sprintf(buffer,"%d",ximagePtr->bits_per_pixel); Tcl_AppendResult(interp, " bits_per_pixel ", buffer, NULL);
sprintf(buffer,"0x%8.8lx",ximagePtr->red_mask); Tcl_AppendResult(interp, " red_mask ", buffer, NULL);
sprintf(buffer,"0x%8.8lx",ximagePtr->green_mask); Tcl_AppendResult(interp, " green_mask ", buffer, NULL);
sprintf(buffer,"0x%8.8lx",ximagePtr->blue_mask); Tcl_AppendResult(interp, " blue_mask ", buffer, NULL);
Tcl_AppendResult(interp, " }", NULL);
Tcl_AppendResult(interp, "\nvisualPtr {", NULL);
sprintf(buffer,"0x%8.8lx",visualPtr->red_mask); Tcl_AppendResult(interp, " red_mask ", buffer, NULL);
sprintf(buffer,"0x%8.8lx",visualPtr->green_mask); Tcl_AppendResult(interp, " green_mask ", buffer, NULL);
sprintf(buffer,"0x%8.8lx",visualPtr->blue_mask); Tcl_AppendResult(interp, " blue_mask ", buffer, NULL);
Tcl_AppendResult(interp, " }", NULL);
#endif
/*
* Fill in the PhotoImageBlock structure abd allocate a block of memory
* for the converted image data. Note we allocate an alpha channel even
* though we don't use one, because this layout helps Tk_PhotoPutBlock()
* use memcpy() instead of the slow pixel or line copy.
*/
blockPtr.width = cWidth;
blockPtr.height = cHeight;
blockPtr.pixelSize = 4;
blockPtr.pitch = blockPtr.pixelSize * blockPtr.width;
blockPtr.offset[0] = 0;
blockPtr.offset[1] = 1;
blockPtr.offset[2] = 2;
blockPtr.offset[3] = 3;
blockPtr.pixelPtr = ckalloc(blockPtr.pixelSize * blockPtr.height * blockPtr.width);
/*
* Now convert the image data pixel by pixel from XImage to 32bit RGBA
* format suitable for Tk_PhotoPutBlock().
*/
DecomposeMaskToShiftAndBits(visualPtr->red_mask,&rshift,&rbits);
DecomposeMaskToShiftAndBits(visualPtr->green_mask,&gshift,&gbits);
DecomposeMaskToShiftAndBits(visualPtr->blue_mask,&bshift,&bbits);
#ifdef DEBUG_DRAWCANVAS
sprintf(buffer,"%d",rshift); Tcl_AppendResult(interp, "\nbits { rshift ", buffer, NULL);
sprintf(buffer,"%d",gshift); Tcl_AppendResult(interp, " gshift ", buffer, NULL);
sprintf(buffer,"%d",bshift); Tcl_AppendResult(interp, " bshift ", buffer, NULL);
sprintf(buffer,"%d",rbits); Tcl_AppendResult(interp, " rbits ", buffer, NULL);
sprintf(buffer,"%d",gbits); Tcl_AppendResult(interp, " gbits ", buffer, NULL);
sprintf(buffer,"%d",bbits); Tcl_AppendResult(interp, " bbits ", buffer, " }", NULL);
Tcl_AppendResult(interp, "\nConverted_image {", NULL);
#endif
/* Ok, had to use ximagePtr->bits_per_pixel here and in the switch (...)
* below to get this to work on Windows. X11 correctly sets the bitmap
*_pad and bitmap_unit fields to 32, but on Windows they are 0 and 8
* respectively!
*/
bytesPerPixel = ximagePtr->bits_per_pixel/8;
for (y = 0; y < blockPtr.height; ++y) {
#ifdef DEBUG_DRAWCANVAS
Tcl_AppendResult(interp, " {", NULL);
#endif
for(x = 0; x < blockPtr.width; ++x) {
unsigned long pixel = 0;
switch (ximagePtr->bits_per_pixel) {
/*
* Get an 8 bit pixel from the XImage.
*/
case 8 :
pixel = *((unsigned char *)(ximagePtr->data + bytesPerPixel * x
+ ximagePtr->bytes_per_line * y));
break;
/*
* Get a 16 bit pixel from the XImage, and correct the
* byte order as necessary.
*/
case 16 :
pixel = *((unsigned short *)(ximagePtr->data + bytesPerPixel * x
+ ximagePtr->bytes_per_line * y));
if ((IS_BIG_ENDIAN && ximagePtr->byte_order == LSBFirst)
|| (!IS_BIG_ENDIAN && ximagePtr->byte_order == MSBFirst))
pixel = BYTE_SWAP16(pixel);
break;
/*
* Grab a 32 bit pixel from the XImage, and correct the
* byte order as necessary.
*/
case 32 :
pixel = *((unsigned long *)(ximagePtr->data + bytesPerPixel * x
+ ximagePtr->bytes_per_line * y));
if ((IS_BIG_ENDIAN && ximagePtr->byte_order == LSBFirst)
|| (!IS_BIG_ENDIAN && ximagePtr->byte_order == MSBFirst))
pixel = BYTE_SWAP32(pixel);
break;
}
/*
* We have a pixel with the correct byte order, so pull out the
* colours and place them in the photo block. Perhaps we could
* just not bother with the alpha byte because we are using
* TK_PHOTO_COMPOSITE_SET later?
* ***Windows: We have to swap the red and blue values. The
* XImage storage is B - G - R - A which becomes a 32bit ARGB
* quad. However the visual mask is a 32bit ABGR quad. And
* Tk_PhotoPutBlock() wants R-G-B-A which is a 32bit ABGR quad.
* If the visual mask was correct there would be no need to
* swap anything here.
*/
#ifdef _WIN32
#define R_OFFSET 2
#define B_OFFSET 0
#else
#define R_OFFSET 0
#define B_OFFSET 2
#endif
blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x + R_OFFSET] =
(unsigned char)((pixel & visualPtr->red_mask) >> rshift);
blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x +1] =
(unsigned char)((pixel & visualPtr->green_mask) >> gshift);
blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x + B_OFFSET] =
(unsigned char)((pixel & visualPtr->blue_mask) >> bshift);
blockPtr.pixelPtr[blockPtr.pitch * y + blockPtr.pixelSize * x +3] = 0xFF;
#ifdef DEBUG_DRAWCANVAS
{
int ix;
if (x > 0)
Tcl_AppendResult(interp, "-", NULL);
for (ix = 0; ix < 4; ++ix) {
if (ix > 0)
Tcl_AppendResult(interp, " ", NULL);
sprintf(buffer,"%2.2x",blockPtr.pixelPtr[blockPtr.pitch * y
+ blockPtr.pixelSize * x + ix]&0xFF);
Tcl_AppendResult(interp, buffer, NULL);
}
}
#endif
}
#ifdef DEBUG_DRAWCANVAS
Tcl_AppendResult(interp, " }", NULL);
#endif
}
#ifdef DEBUG_DRAWCANVAS
Tcl_AppendResult(interp, " }", NULL);
#endif
/*
* Now put the copied pixmap into the photo.
* If either zoom or subsample are not 1, we use the zoom function.
*/
if (subsample != 1 || zoom != 1) {
if ((result = Tk_PhotoPutZoomedBlock(interp, photohandle, &blockPtr,
0, 0, cWidth * zoom / subsample, cHeight * zoom / subsample,
zoom, zoom, subsample, subsample, TK_PHOTO_COMPOSITE_SET))
!= TCL_OK) {
goto done;
}
} else {
if ((result = Tk_PhotoPutBlock(interp, photohandle, &blockPtr, 0, 0,
cWidth, cHeight, TK_PHOTO_COMPOSITE_SET)) != TCL_OK) {
goto done;
}
}
/*
* Clean up anything we have allocated and exit.
*/
done:
if (blockPtr.pixelPtr)
ckfree(blockPtr.pixelPtr);
if (pixmap)
Tk_FreePixmap(Tk_Display(tkwin), pixmap);
if (ximagePtr)
XDestroyImage(ximagePtr);
if (xgc)
XFreeGC(displayPtr,xgc);
return result;
}
/*
*----------------------------------------------------------------------
*
* DisplayCanvas --
*
* This function redraws the contents of a canvas window. It is invoked
* as a do-when-idle handler, so it only runs when there's nothing else
* for the application to do.
*
* Results:
* None.
*
* Side effects:
* Information appears on the screen.
*
*----------------------------------------------------------------------
*/
static void
DisplayCanvas(
ClientData clientData) /* Information about widget. */
{
TkCanvas *canvasPtr = clientData;
Tk_Window tkwin = canvasPtr->tkwin;
Tk_Item *itemPtr;
Pixmap pixmap;
int screenX1, screenX2, screenY1, screenY2, width, height;
if (canvasPtr->tkwin == NULL) {
return;
}
if (!Tk_IsMapped(tkwin)) {
goto done;
}
#ifdef MAC_OSX_TK
/*
* If drawing is disabled, all we need to do is
* clear the REDRAW_PENDING flag.
*/
TkWindow *winPtr = (TkWindow *)(canvasPtr->tkwin);
MacDrawable *macWin = winPtr->privatePtr;
if (macWin && (macWin->flags & TK_DO_NOT_DRAW)){
canvasPtr->flags &= ~REDRAW_PENDING;
return;
}
#endif
/*
* Choose a new current item if that is needed (this could cause event
* handlers to be invoked).
*/
while (canvasPtr->flags & REPICK_NEEDED) {
Tcl_Preserve(canvasPtr);
canvasPtr->flags &= ~REPICK_NEEDED;
PickCurrentItem(canvasPtr, &canvasPtr->pickEvent);
tkwin = canvasPtr->tkwin;
Tcl_Release(canvasPtr);
if (tkwin == NULL) {
return;
}
}
/*
* Scan through the item list, registering the bounding box for all items
* that didn't do that for the final coordinates yet. This can be
* determined by the FORCE_REDRAW flag.
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if (itemPtr->redraw_flags & FORCE_REDRAW) {
itemPtr->redraw_flags &= ~FORCE_REDRAW;
EventuallyRedrawItem(canvasPtr, itemPtr);
itemPtr->redraw_flags &= ~FORCE_REDRAW;
}
}
/*
* Compute the intersection between the area that needs redrawing and the
* area that's visible on the screen.
*/
if ((canvasPtr->redrawX1 < canvasPtr->redrawX2)
&& (canvasPtr->redrawY1 < canvasPtr->redrawY2)) {
screenX1 = canvasPtr->xOrigin + canvasPtr->inset;
screenY1 = canvasPtr->yOrigin + canvasPtr->inset;
screenX2 = canvasPtr->xOrigin + Tk_Width(tkwin) - canvasPtr->inset;
screenY2 = canvasPtr->yOrigin + Tk_Height(tkwin) - canvasPtr->inset;
if (canvasPtr->redrawX1 > screenX1) {
screenX1 = canvasPtr->redrawX1;
}
if (canvasPtr->redrawY1 > screenY1) {
screenY1 = canvasPtr->redrawY1;
}
if (canvasPtr->redrawX2 < screenX2) {
screenX2 = canvasPtr->redrawX2;
}
if (canvasPtr->redrawY2 < screenY2) {
screenY2 = canvasPtr->redrawY2;
}
if ((screenX1 >= screenX2) || (screenY1 >= screenY2)) {
goto borders;
}
width = screenX2 - screenX1;
height = screenY2 - screenY1;
#ifndef TK_NO_DOUBLE_BUFFERING
/*
* Redrawing is done in a temporary pixmap that is allocated here and
* freed at the end of the function. All drawing is done to the
* pixmap, and the pixmap is copied to the screen at the end of the
* function. The temporary pixmap serves two purposes:
*
* 1. It provides a smoother visual effect (no clearing and gradual
* redraw will be visible to users).
* 2. It allows us to redraw only the objects that overlap the redraw
* area. Otherwise incorrect results could occur from redrawing
* things that stick outside of the redraw area (we'd have to
* redraw everything in order to make the overlaps look right).
*
* Some tricky points about the pixmap:
*
* 1. We only allocate a large enough pixmap to hold the area that has
* to be redisplayed. This saves time in in the X server for large
* objects that cover much more than the area being redisplayed:
* only the area of the pixmap will actually have to be redrawn.
* 2. Some X servers (e.g. the one for DECstations) have troubles with
* with characters that overlap an edge of the pixmap (on the DEC
* servers, as of 8/18/92, such characters are drawn one pixel too
* far to the right). To handle this problem, make the pixmap a bit
* larger than is absolutely needed so that for normal-sized fonts
* the characters that overlap the edge of the pixmap will be
* outside the area we care about.
*/
canvasPtr->drawableXOrigin = screenX1 - 30;
canvasPtr->drawableYOrigin = screenY1 - 30;
pixmap = Tk_GetPixmap(Tk_Display(tkwin), Tk_WindowId(tkwin),
(screenX2 + 30 - canvasPtr->drawableXOrigin),
(screenY2 + 30 - canvasPtr->drawableYOrigin),
Tk_Depth(tkwin));
#else
canvasPtr->drawableXOrigin = canvasPtr->xOrigin;
canvasPtr->drawableYOrigin = canvasPtr->yOrigin;
pixmap = Tk_WindowId(tkwin);
TkpClipDrawableToRect(Tk_Display(tkwin), pixmap,
screenX1 - canvasPtr->xOrigin, screenY1 - canvasPtr->yOrigin,
width, height);
#endif /* TK_NO_DOUBLE_BUFFERING */
/*
* Clear the area to be redrawn.
*/
XFillRectangle(Tk_Display(tkwin), pixmap, canvasPtr->pixmapGC,
screenX1 - canvasPtr->drawableXOrigin,
screenY1 - canvasPtr->drawableYOrigin, (unsigned int) width,
(unsigned int) height);
/*
* Scan through the item list, redrawing those items that need it. An
* item must be redraw if either (a) it intersects the smaller
* on-screen area or (b) it intersects the full canvas area and its
* type requests that it be redrawn always (e.g. so subwindows can be
* unmapped when they move off-screen).
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if ((itemPtr->x1 >= screenX2)
|| (itemPtr->y1 >= screenY2)
|| (itemPtr->x2 < screenX1)
|| (itemPtr->y2 < screenY1)) {
if (!AlwaysRedraw(itemPtr)
|| (itemPtr->x1 >= canvasPtr->redrawX2)
|| (itemPtr->y1 >= canvasPtr->redrawY2)
|| (itemPtr->x2 < canvasPtr->redrawX1)
|| (itemPtr->y2 < canvasPtr->redrawY1)) {
continue;
}
}
if (itemPtr->state == TK_STATE_HIDDEN ||
(itemPtr->state == TK_STATE_NULL &&
canvasPtr->canvas_state == TK_STATE_HIDDEN)) {
continue;
}
ItemDisplay(canvasPtr, itemPtr, pixmap, screenX1, screenY1, width,
height);
}
#ifndef TK_NO_DOUBLE_BUFFERING
/*
* Copy from the temporary pixmap to the screen, then free up the
* temporary pixmap.
*/
XCopyArea(Tk_Display(tkwin), pixmap, Tk_WindowId(tkwin),
canvasPtr->pixmapGC,
screenX1 - canvasPtr->drawableXOrigin,
screenY1 - canvasPtr->drawableYOrigin,
(unsigned int) width, (unsigned int) height,
screenX1 - canvasPtr->xOrigin, screenY1 - canvasPtr->yOrigin);
Tk_FreePixmap(Tk_Display(tkwin), pixmap);
#else
TkpClipDrawableToRect(Tk_Display(tkwin), pixmap, 0, 0, -1, -1);
#endif /* TK_NO_DOUBLE_BUFFERING */
}
/*
* Draw the window borders, if needed.
*/
borders:
if (canvasPtr->flags & REDRAW_BORDERS) {
canvasPtr->flags &= ~REDRAW_BORDERS;
if (canvasPtr->borderWidth > 0) {
Tk_Draw3DRectangle(tkwin, Tk_WindowId(tkwin),
canvasPtr->bgBorder, canvasPtr->highlightWidth,
canvasPtr->highlightWidth,
Tk_Width(tkwin) - 2*canvasPtr->highlightWidth,
Tk_Height(tkwin) - 2*canvasPtr->highlightWidth,
canvasPtr->borderWidth, canvasPtr->relief);
}
if (canvasPtr->highlightWidth != 0) {
GC fgGC, bgGC;
bgGC = Tk_GCForColor(canvasPtr->highlightBgColorPtr,
Tk_WindowId(tkwin));
if (canvasPtr->textInfo.gotFocus) {
fgGC = Tk_GCForColor(canvasPtr->highlightColorPtr,
Tk_WindowId(tkwin));
TkpDrawHighlightBorder(tkwin, fgGC, bgGC,
canvasPtr->highlightWidth, Tk_WindowId(tkwin));
} else {
TkpDrawHighlightBorder(tkwin, bgGC, bgGC,
canvasPtr->highlightWidth, Tk_WindowId(tkwin));
}
}
}
done:
canvasPtr->flags &= ~(REDRAW_PENDING|BBOX_NOT_EMPTY);
canvasPtr->redrawX1 = canvasPtr->redrawX2 = 0;
canvasPtr->redrawY1 = canvasPtr->redrawY2 = 0;
if (canvasPtr->flags & UPDATE_SCROLLBARS) {
CanvasUpdateScrollbars(canvasPtr);
}
}
/*
*----------------------------------------------------------------------
*
* CanvasEventProc --
*
* This function is invoked by the Tk dispatcher for various events on
* canvases.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get cleaned up. When
* it gets exposed, it is redisplayed.
*
*----------------------------------------------------------------------
*/
static void
CanvasEventProc(
ClientData clientData, /* Information about window. */
XEvent *eventPtr) /* Information about event. */
{
TkCanvas *canvasPtr = clientData;
if (eventPtr->type == Expose) {
int x, y;
x = eventPtr->xexpose.x + canvasPtr->xOrigin;
y = eventPtr->xexpose.y + canvasPtr->yOrigin;
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr, x, y,
x + eventPtr->xexpose.width,
y + eventPtr->xexpose.height);
if ((eventPtr->xexpose.x < canvasPtr->inset)
|| (eventPtr->xexpose.y < canvasPtr->inset)
|| ((eventPtr->xexpose.x + eventPtr->xexpose.width)
> (Tk_Width(canvasPtr->tkwin) - canvasPtr->inset))
|| ((eventPtr->xexpose.y + eventPtr->xexpose.height)
> (Tk_Height(canvasPtr->tkwin) - canvasPtr->inset))) {
canvasPtr->flags |= REDRAW_BORDERS;
}
} else if (eventPtr->type == DestroyNotify) {
if (canvasPtr->tkwin != NULL) {
canvasPtr->tkwin = NULL;
Tcl_DeleteCommandFromToken(canvasPtr->interp,
canvasPtr->widgetCmd);
}
if (canvasPtr->flags & REDRAW_PENDING) {
Tcl_CancelIdleCall(DisplayCanvas, canvasPtr);
}
Tcl_EventuallyFree(canvasPtr, (Tcl_FreeProc *) DestroyCanvas);
} else if (eventPtr->type == ConfigureNotify) {
canvasPtr->flags |= UPDATE_SCROLLBARS;
/*
* The call below is needed in order to recenter the canvas if it's
* confined and its scroll region is smaller than the window.
*/
CanvasSetOrigin(canvasPtr, canvasPtr->xOrigin, canvasPtr->yOrigin);
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr, canvasPtr->xOrigin,
canvasPtr->yOrigin,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
canvasPtr->flags |= REDRAW_BORDERS;
} else if (eventPtr->type == FocusIn) {
if (eventPtr->xfocus.detail != NotifyInferior) {
CanvasFocusProc(canvasPtr, 1);
}
} else if (eventPtr->type == FocusOut) {
if (eventPtr->xfocus.detail != NotifyInferior) {
CanvasFocusProc(canvasPtr, 0);
}
} else if (eventPtr->type == UnmapNotify) {
Tk_Item *itemPtr;
/*
* Special hack: if the canvas is unmapped, then must notify all items
* with "alwaysRedraw" set, so that they know that they are no longer
* displayed.
*/
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if (AlwaysRedraw(itemPtr)) {
ItemDisplay(canvasPtr, itemPtr, None, 0, 0, 0, 0);
}
}
}
}
/*
*----------------------------------------------------------------------
*
* CanvasCmdDeletedProc --
*
* This function is invoked when a widget command is deleted. If the
* widget isn't already in the process of being destroyed, this command
* destroys it.
*
* Results:
* None.
*
* Side effects:
* The widget is destroyed.
*
*----------------------------------------------------------------------
*/
static void
CanvasCmdDeletedProc(
ClientData clientData) /* Pointer to widget record for widget. */
{
TkCanvas *canvasPtr = clientData;
Tk_Window tkwin = canvasPtr->tkwin;
/*
* This function could be invoked either because the window was destroyed
* and the command was then deleted (in which case tkwin is NULL) or
* because the command was deleted, and then this function destroys the
* widget.
*/
if (tkwin != NULL) {
canvasPtr->tkwin = NULL;
Tk_DestroyWindow(tkwin);
}
}
/*
*----------------------------------------------------------------------
*
* Tk_CanvasEventuallyRedraw --
*
* Arrange for part or all of a canvas widget to redrawn at some
* convenient time in the future.
*
* Results:
* None.
*
* Side effects:
* The screen will eventually be refreshed.
*
*----------------------------------------------------------------------
*/
void
Tk_CanvasEventuallyRedraw(
Tk_Canvas canvas, /* Information about widget. */
int x1, int y1, /* Upper left corner of area to redraw. Pixels
* on edge are redrawn. */
int x2, int y2) /* Lower right corner of area to redraw.
* Pixels on edge are not redrawn. */
{
TkCanvas *canvasPtr = Canvas(canvas);
/*
* If tkwin is NULL, the canvas has been destroyed, so we can't really
* redraw it.
*/
if (canvasPtr->tkwin == NULL) {
return;
}
if ((x1 >= x2) || (y1 >= y2) ||
(x2 < canvasPtr->xOrigin) || (y2 < canvasPtr->yOrigin) ||
(x1 >= canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin)) ||
(y1 >= canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin))) {
return;
}
if (canvasPtr->flags & BBOX_NOT_EMPTY) {
if (x1 <= canvasPtr->redrawX1) {
canvasPtr->redrawX1 = x1;
}
if (y1 <= canvasPtr->redrawY1) {
canvasPtr->redrawY1 = y1;
}
if (x2 >= canvasPtr->redrawX2) {
canvasPtr->redrawX2 = x2;
}
if (y2 >= canvasPtr->redrawY2) {
canvasPtr->redrawY2 = y2;
}
} else {
canvasPtr->redrawX1 = x1;
canvasPtr->redrawY1 = y1;
canvasPtr->redrawX2 = x2;
canvasPtr->redrawY2 = y2;
canvasPtr->flags |= BBOX_NOT_EMPTY;
}
if (!(canvasPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayCanvas, canvasPtr);
canvasPtr->flags |= REDRAW_PENDING;
}
}
/*
*----------------------------------------------------------------------
*
* EventuallyRedrawItem --
*
* Arrange for part or all of a canvas widget to redrawn at some
* convenient time in the future.
*
* Results:
* None.
*
* Side effects:
* The screen will eventually be refreshed.
*
*----------------------------------------------------------------------
*/
static void
EventuallyRedrawItem(
TkCanvas *canvasPtr, /* Information about widget. */
Tk_Item *itemPtr) /* Item to be redrawn. May be NULL, in which
* case nothing happens. */
{
if (itemPtr == NULL || canvasPtr->tkwin == NULL) {
return;
}
if ((itemPtr->x1 >= itemPtr->x2) || (itemPtr->y1 >= itemPtr->y2) ||
(itemPtr->x2 < canvasPtr->xOrigin) ||
(itemPtr->y2 < canvasPtr->yOrigin) ||
(itemPtr->x1 >= canvasPtr->xOrigin+Tk_Width(canvasPtr->tkwin)) ||
(itemPtr->y1 >= canvasPtr->yOrigin+Tk_Height(canvasPtr->tkwin))) {
if (!AlwaysRedraw(itemPtr)) {
return;
}
}
if (!(itemPtr->redraw_flags & FORCE_REDRAW)) {
if (canvasPtr->flags & BBOX_NOT_EMPTY) {
if (itemPtr->x1 <= canvasPtr->redrawX1) {
canvasPtr->redrawX1 = itemPtr->x1;
}
if (itemPtr->y1 <= canvasPtr->redrawY1) {
canvasPtr->redrawY1 = itemPtr->y1;
}
if (itemPtr->x2 >= canvasPtr->redrawX2) {
canvasPtr->redrawX2 = itemPtr->x2;
}
if (itemPtr->y2 >= canvasPtr->redrawY2) {
canvasPtr->redrawY2 = itemPtr->y2;
}
} else {
canvasPtr->redrawX1 = itemPtr->x1;
canvasPtr->redrawY1 = itemPtr->y1;
canvasPtr->redrawX2 = itemPtr->x2;
canvasPtr->redrawY2 = itemPtr->y2;
canvasPtr->flags |= BBOX_NOT_EMPTY;
}
itemPtr->redraw_flags |= FORCE_REDRAW;
}
if (!(canvasPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayCanvas, canvasPtr);
canvasPtr->flags |= REDRAW_PENDING;
}
}
/*
*----------------------------------------------------------------------
*
* Tk_CreateItemType --
*
* This function may be invoked to add a new kind of canvas element to
* the core item types supported by Tk.
*
* Results:
* None.
*
* Side effects:
* From now on, the new item type will be useable in canvas widgets
* (e.g. typePtr->name can be used as the item type in "create" widget
* commands). If there was already a type with the same name as in
* typePtr, it is replaced with the new type.
*
*----------------------------------------------------------------------
*/
void
Tk_CreateItemType(
Tk_ItemType *typePtr) /* Information about item type; storage must
* be statically allocated (must live
* forever). */
{
Tk_ItemType *typePtr2, *prevPtr;
if (typeList == NULL) {
InitCanvas();
}
/*
* If there's already an item type with the given name, remove it.
*/
Tcl_MutexLock(&typeListMutex);
for (typePtr2 = typeList, prevPtr = NULL; typePtr2 != NULL;
prevPtr = typePtr2, typePtr2 = typePtr2->nextPtr) {
if (strcmp(typePtr2->name, typePtr->name) == 0) {
if (prevPtr == NULL) {
typeList = typePtr2->nextPtr;
} else {
prevPtr->nextPtr = typePtr2->nextPtr;
}
break;
}
}
typePtr->nextPtr = typeList;
typeList = typePtr;
Tcl_MutexUnlock(&typeListMutex);
}
/*
*----------------------------------------------------------------------
*
* Tk_GetItemTypes --
*
* This function returns a pointer to the list of all item types. Note
* that this is inherently thread-unsafe, but since item types are only
* ever registered very rarely this is unlikely to be a problem in
* practice.
*
* Results:
* The return value is a pointer to the first in the list of item types
* currently supported by canvases.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tk_ItemType *
Tk_GetItemTypes(void)
{
if (typeList == NULL) {
InitCanvas();
}
return typeList;
}
/*
*----------------------------------------------------------------------
*
* InitCanvas --
*
* This function is invoked to perform once-only-ever initialization for
* the module, such as setting up the type table.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
InitCanvas(void)
{
Tcl_MutexLock(&typeListMutex);
if (typeList != NULL) {
Tcl_MutexUnlock(&typeListMutex);
return;
}
typeList = &tkRectangleType;
tkRectangleType.nextPtr = &tkTextType;
tkTextType.nextPtr = &tkLineType;
tkLineType.nextPtr = &tkPolygonType;
tkPolygonType.nextPtr = &tkImageType;
tkImageType.nextPtr = &tkOvalType;
tkOvalType.nextPtr = &tkBitmapType;
tkBitmapType.nextPtr = &tkArcType;
tkArcType.nextPtr = &tkWindowType;
tkWindowType.nextPtr = NULL;
Tcl_MutexUnlock(&typeListMutex);
}
/*
*----------------------------------------------------------------------
*
* GetStaticUids --
*
* This function is invoked to return a structure filled with the Uids
* used when doing tag searching. If it was never before called in the
* current thread, it initializes the structure for that thread (uids are
* only ever local to one thread [Bug 1114977]).
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static SearchUids *
GetStaticUids(void)
{
SearchUids *searchUids =
Tcl_GetThreadData(&dataKey, sizeof(SearchUids));
if (searchUids->allUid == NULL) {
searchUids->allUid = Tk_GetUid("all");
searchUids->currentUid = Tk_GetUid("current");
searchUids->andUid = Tk_GetUid("&&");
searchUids->orUid = Tk_GetUid("||");
searchUids->xorUid = Tk_GetUid("^");
searchUids->parenUid = Tk_GetUid("(");
searchUids->endparenUid = Tk_GetUid(")");
searchUids->negparenUid = Tk_GetUid("!(");
searchUids->tagvalUid = Tk_GetUid("!!");
searchUids->negtagvalUid = Tk_GetUid("!");
}
return searchUids;
}
/*
*--------------------------------------------------------------
*
* TagSearchExprInit --
*
* This function allocates and initializes one TagSearchExpr struct.
*
* Results:
*
* Side effects:
*
*--------------------------------------------------------------
*/
static void
TagSearchExprInit(
TagSearchExpr **exprPtrPtr)
{
TagSearchExpr *expr = *exprPtrPtr;
if (expr == NULL) {
expr = ckalloc(sizeof(TagSearchExpr));
expr->allocated = 0;
expr->uids = NULL;
expr->next = NULL;
}
expr->uid = NULL;
expr->index = 0;
expr->length = 0;
*exprPtrPtr = expr;
}
/*
*--------------------------------------------------------------
*
* TagSearchExprDestroy --
*
* This function destroys one TagSearchExpr structure.
*
* Results:
*
* Side effects:
*
*--------------------------------------------------------------
*/
static void
TagSearchExprDestroy(
TagSearchExpr *expr)
{
if (expr != NULL) {
if (expr->uids) {
ckfree(expr->uids);
}
ckfree(expr);
}
}
/*
*--------------------------------------------------------------
*
* TagSearchScan --
*
* This function is called to initiate an enumeration of all items in a
* given canvas that contain a tag that matches the tagOrId expression.
*
* Results:
* The return value indicates if the tagOrId expression was successfully
* scanned (syntax). The information at *searchPtr is initialized such
* that a call to TagSearchFirst, followed by successive calls to
* TagSearchNext will return items that match tag.
*
* Side effects:
* SearchPtr is linked into a list of searches in progress on canvasPtr,
* so that elements can safely be deleted while the search is in
* progress.
*
*--------------------------------------------------------------
*/
static int
TagSearchScan(
TkCanvas *canvasPtr, /* Canvas whose items are to be searched. */
Tcl_Obj *tagObj, /* Object giving tag value. */
TagSearch **searchPtrPtr) /* Record describing tag search; will be
* initialized here. */
{
const char *tag = Tcl_GetString(tagObj);
int i;
TagSearch *searchPtr;
/*
* Initialize the search.
*/
if (*searchPtrPtr != NULL) {
searchPtr = *searchPtrPtr;
} else {
/*
* Allocate primary search struct on first call.
*/
*searchPtrPtr = searchPtr = ckalloc(sizeof(TagSearch));
searchPtr->expr = NULL;
/*
* Allocate buffer for rewritten tags (after de-escaping).
*/
searchPtr->rewritebufferAllocated = 100;
searchPtr->rewritebuffer = ckalloc(searchPtr->rewritebufferAllocated);
}
TagSearchExprInit(&searchPtr->expr);
/*
* How long is the tagOrId?
*/
searchPtr->stringLength = strlen(tag);
/*
* Make sure there is enough buffer to hold rewritten tags.
*/
if ((unsigned) searchPtr->stringLength >=
searchPtr->rewritebufferAllocated) {
searchPtr->rewritebufferAllocated = searchPtr->stringLength + 100;
searchPtr->rewritebuffer =
ckrealloc(searchPtr->rewritebuffer,
searchPtr->rewritebufferAllocated);
}
/*
* Initialize search.
*/
searchPtr->canvasPtr = canvasPtr;
searchPtr->searchOver = 0;
searchPtr->type = SEARCH_TYPE_EMPTY;
/*
* Find the first matching item in one of several ways. If the tag is a
* number then it selects the single item with the matching identifier.
* In this case see if the item being requested is the hot item, in which
* case the search can be skipped.
*/
if (searchPtr->stringLength && isdigit(UCHAR(*tag))) {
char *end;
searchPtr->id = strtoul(tag, &end, 0);
if (*end == 0) {
searchPtr->type = SEARCH_TYPE_ID;
return TCL_OK;
}
}
/*
* For all other tags and tag expressions convert to a UID. This UID is
* kept forever, but this should be thought of as a cache rather than as a
* memory leak.
*/
searchPtr->expr->uid = Tk_GetUid(tag);
/*
* Short circuit impossible searches for null tags.
*/
if (searchPtr->stringLength == 0) {
return TCL_OK;
}
/*
* Pre-scan tag for at least one unquoted "&&" "||" "^" "!"; if not found
* then use string as simple tag.
*/
for (i = 0; i < searchPtr->stringLength ; i++) {
if (tag[i] == '"') {
i++;
for ( ; i < searchPtr->stringLength; i++) {
if (tag[i] == '\\') {
i++;
continue;
}
if (tag[i] == '"') {
break;
}
}
} else if ((tag[i] == '&' && tag[i+1] == '&')
|| (tag[i] == '|' && tag[i+1] == '|')
|| (tag[i] == '^')
|| (tag[i] == '!')) {
searchPtr->type = SEARCH_TYPE_EXPR;
break;
}
}
searchPtr->string = tag;
searchPtr->stringIndex = 0;
if (searchPtr->type == SEARCH_TYPE_EXPR) {
/*
* An operator was found in the prescan, so now compile the tag
* expression into array of Tk_Uid flagging any syntax errors found.
*/
if (TagSearchScanExpr(canvasPtr->interp, searchPtr,
searchPtr->expr) != TCL_OK) {
/*
* Syntax error in tag expression. The result message was set by
* TagSearchScanExpr.
*/
return TCL_ERROR;
}
searchPtr->expr->length = searchPtr->expr->index;
} else if (searchPtr->expr->uid == GetStaticUids()->allUid) {
/*
* All items match.
*/
searchPtr->type = SEARCH_TYPE_ALL;
} else {
/*
* Optimized single-tag search
*/
searchPtr->type = SEARCH_TYPE_TAG;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* TagSearchDestroy --
*
* This function destroys any dynamic structures that may have been
* allocated by TagSearchScan.
*
* Results:
* None
*
* Side effects:
* Deallocates memory.
*
*--------------------------------------------------------------
*/
static void
TagSearchDestroy(
TagSearch *searchPtr) /* Record describing tag search. */
{
if (searchPtr) {
TagSearchExprDestroy(searchPtr->expr);
ckfree(searchPtr->rewritebuffer);
ckfree(searchPtr);
}
}
/*
*--------------------------------------------------------------
*
* TagSearchScanExpr --
*
* This recursive function is called to scan a tag expression and compile
* it into an array of Tk_Uids.
*
* Results:
* The return value indicates if the tagOrId expression was successfully
* scanned (syntax). The information at *searchPtr is initialized such
* that a call to TagSearchFirst, followed by successive calls to
* TagSearchNext will return items that match tag.
*
* Side effects:
*
*--------------------------------------------------------------
*/
static int
TagSearchScanExpr(
Tcl_Interp *interp, /* Current interpreter. */
TagSearch *searchPtr, /* Search data. */
TagSearchExpr *expr) /* Compiled expression result. */
{
int looking_for_tag; /* When true, scanner expects next char(s) to
* be a tag, else operand expected. */
int found_tag; /* One or more tags found. */
int found_endquote; /* For quoted tag string parsing. */
int negate_result; /* Pending negation of next tag value. */
char *tag; /* Tag from tag expression string. */
char c;
SearchUids *searchUids; /* Collection of uids for basic search
* expression terms. */
searchUids = GetStaticUids();
negate_result = 0;
found_tag = 0;
looking_for_tag = 1;
while (searchPtr->stringIndex < searchPtr->stringLength) {
c = searchPtr->string[searchPtr->stringIndex++];
/*
* Need two slots free at this point, not one. [Bug 2931374]
*/
if (expr->index >= expr->allocated-1) {
expr->allocated += 15;
if (expr->uids) {
expr->uids = ckrealloc(expr->uids,
expr->allocated * sizeof(Tk_Uid));
} else {
expr->uids = ckalloc(expr->allocated * sizeof(Tk_Uid));
}
}
if (looking_for_tag) {
switch (c) {
case ' ': /* Ignore unquoted whitespace */
case '\t':
case '\n':
case '\r':
break;
case '!': /* Negate next tag or subexpr */
if (looking_for_tag > 1) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"too many '!' in tag search expression", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH",
"COMPLEXITY", NULL);
return TCL_ERROR;
}
looking_for_tag++;
negate_result = 1;
break;
case '(': /* Scan (negated) subexpr recursively */
if (negate_result) {
expr->uids[expr->index++] = searchUids->negparenUid;
negate_result = 0;
} else {
expr->uids[expr->index++] = searchUids->parenUid;
}
if (TagSearchScanExpr(interp, searchPtr, expr) != TCL_OK) {
/*
* Result string should be already set by nested call to
* tag_expr_scan()
*/
return TCL_ERROR;
}
looking_for_tag = 0;
found_tag = 1;
break;
case '"': /* Quoted tag string */
if (negate_result) {
expr->uids[expr->index++] = searchUids->negtagvalUid;
negate_result = 0;
} else {
expr->uids[expr->index++] = searchUids->tagvalUid;
}
tag = searchPtr->rewritebuffer;
found_endquote = 0;
while (searchPtr->stringIndex < searchPtr->stringLength) {
c = searchPtr->string[searchPtr->stringIndex++];
if (c == '\\') {
c = searchPtr->string[searchPtr->stringIndex++];
}
if (c == '"') {
found_endquote = 1;
break;
}
*tag++ = c;
}
if (!found_endquote) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"missing endquote in tag search expression", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH",
"ENDQUOTE", NULL);
return TCL_ERROR;
}
if (!(tag - searchPtr->rewritebuffer)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"null quoted tag string in tag search expression",
-1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH",
"EMPTY", NULL);
return TCL_ERROR;
}
*tag++ = '\0';
expr->uids[expr->index++] =
Tk_GetUid(searchPtr->rewritebuffer);
looking_for_tag = 0;
found_tag = 1;
break;
case '&': /* Illegal chars when looking for tag */
case '|':
case '^':
case ')':
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"unexpected operator in tag search expression", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH",
"UNEXPECTED", NULL);
return TCL_ERROR;
default: /* Unquoted tag string */
if (negate_result) {
expr->uids[expr->index++] = searchUids->negtagvalUid;
negate_result = 0;
} else {
expr->uids[expr->index++] = searchUids->tagvalUid;
}
tag = searchPtr->rewritebuffer;
*tag++ = c;
/*
* Copy rest of tag, including any embedded whitespace.
*/
while (searchPtr->stringIndex < searchPtr->stringLength) {
c = searchPtr->string[searchPtr->stringIndex];
if (c == '!' || c == '&' || c == '|' || c == '^'
|| c == '(' || c == ')' || c == '"') {
break;
}
*tag++ = c;
searchPtr->stringIndex++;
}
/*
* Remove trailing whitespace.
*/
while (1) {
c = *--tag;
/*
* There must have been one non-whitespace char, so this
* will terminate.
*/
if (c != ' ' && c != '\t' && c != '\n' && c != '\r') {
break;
}
}
*++tag = '\0';
expr->uids[expr->index++] =
Tk_GetUid(searchPtr->rewritebuffer);
looking_for_tag = 0;
found_tag = 1;
}
} else { /* ! looking_for_tag */
switch (c) {
case ' ': /* Ignore whitespace */
case '\t':
case '\n':
case '\r':
break;
case '&': /* AND operator */
c = searchPtr->string[searchPtr->stringIndex++];
if (c != '&') {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"singleton '&' in tag search expression", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH",
"INCOMPLETE_OP", NULL);
return TCL_ERROR;
}
expr->uids[expr->index++] = searchUids->andUid;
looking_for_tag = 1;
break;
case '|': /* OR operator */
c = searchPtr->string[searchPtr->stringIndex++];
if (c != '|') {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"singleton '|' in tag search expression", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH",
"INCOMPLETE_OP", NULL);
return TCL_ERROR;
}
expr->uids[expr->index++] = searchUids->orUid;
looking_for_tag = 1;
break;
case '^': /* XOR operator */
expr->uids[expr->index++] = searchUids->xorUid;
looking_for_tag = 1;
break;
case ')': /* End subexpression */
expr->uids[expr->index++] = searchUids->endparenUid;
goto breakwhile;
default: /* syntax error */
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"invalid boolean operator in tag search expression",
-1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH", "BAD_OP",
NULL);
return TCL_ERROR;
}
}
}
breakwhile:
if (found_tag && !looking_for_tag) {
return TCL_OK;
}
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"missing tag in tag search expression", -1));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "SEARCH", "NO_TAG", NULL);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* TagSearchEvalExpr --
*
* This recursive function is called to eval a tag expression.
*
* Results:
* The return value indicates if the tagOrId expression successfully
* matched the tags of the current item.
*
* Side effects:
*
*--------------------------------------------------------------
*/
static int
TagSearchEvalExpr(
TagSearchExpr *expr, /* Search expression */
Tk_Item *itemPtr) /* Item being test for match */
{
int looking_for_tag; /* When true, scanner expects next char(s) to
* be a tag, else operand expected. */
int negate_result; /* Pending negation of next tag value */
Tk_Uid uid;
Tk_Uid *tagPtr;
int count;
int result; /* Value of expr so far */
int parendepth;
SearchUids *searchUids; /* Collection of uids for basic search
* expression terms. */
searchUids = GetStaticUids();
result = 0; /* Just to keep the compiler quiet. */
negate_result = 0;
looking_for_tag = 1;
while (expr->index < expr->length) {
uid = expr->uids[expr->index++];
if (looking_for_tag) {
if (uid == searchUids->tagvalUid) {
/*
* assert(expr->index < expr->length);
*/
uid = expr->uids[expr->index++];
result = 0;
/*
* set result 1 if tag is found in item's tags
*/
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (*tagPtr == uid) {
result = 1;
break;
}
}
} else if (uid == searchUids->negtagvalUid) {
negate_result = ! negate_result;
/*
* assert(expr->index < expr->length);
*/
uid = expr->uids[expr->index++];
result = 0;
/*
* set result 1 if tag is found in item's tags.
*/
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (*tagPtr == uid) {
result = 1;
break;
}
}
} else if (uid == searchUids->parenUid) {
/*
* Evaluate subexpressions with recursion.
*/
result = TagSearchEvalExpr(expr, itemPtr);
} else if (uid == searchUids->negparenUid) {
negate_result = !negate_result;
/*
* Evaluate subexpressions with recursion.
*/
result = TagSearchEvalExpr(expr, itemPtr);
}
if (negate_result) {
result = ! result;
negate_result = 0;
}
looking_for_tag = 0;
} else { /* ! looking_for_tag */
if (((uid == searchUids->andUid) && (!result)) ||
((uid == searchUids->orUid) && result)) {
/*
* Short circuit expression evaluation.
*
* if result before && is 0, or result before || is 1, then
* the expression is decided and no further evaluation is
* needed.
*/
parendepth = 0;
while (expr->index < expr->length) {
uid = expr->uids[expr->index++];
if (uid == searchUids->tagvalUid ||
uid == searchUids->negtagvalUid) {
expr->index++;
continue;
}
if (uid == searchUids->parenUid ||
uid == searchUids->negparenUid) {
parendepth++;
continue;
}
if (uid == searchUids->endparenUid) {
parendepth--;
if (parendepth < 0) {
break;
}
}
}
return result;
} else if (uid == searchUids->xorUid) {
/*
* If the previous result was 1 then negate the next result.
*/
negate_result = result;
} else if (uid == searchUids->endparenUid) {
return result;
}
looking_for_tag = 1;
}
}
/*
* assert(!looking_for_tag);
*/
return result;
}
/*
*--------------------------------------------------------------
*
* TagSearchFirst --
*
* This function is called to get the first item item that matches a
* preestablished search predicate that was set by TagSearchScan.
*
* Results:
* The return value is a pointer to the first item, or NULL if there is
* no such item. The information at *searchPtr is updated such that
* successive calls to TagSearchNext will return successive items.
*
* Side effects:
* SearchPtr is linked into a list of searches in progress on canvasPtr,
* so that elements can safely be deleted while the search is in
* progress.
*
*--------------------------------------------------------------
*/
static Tk_Item *
TagSearchFirst(
TagSearch *searchPtr) /* Record describing tag search */
{
Tk_Item *itemPtr, *lastPtr;
Tk_Uid uid, *tagPtr;
int count;
/*
* Short circuit impossible searches for null tags.
*/
if (searchPtr->stringLength == 0) {
return NULL;
}
/*
* Find the first matching item in one of several ways. If the tag is a
* number then it selects the single item with the matching identifier.
* In this case see if the item being requested is the hot item, in which
* case the search can be skipped.
*/
if (searchPtr->type == SEARCH_TYPE_ID) {
Tcl_HashEntry *entryPtr;
itemPtr = searchPtr->canvasPtr->hotPtr;
lastPtr = searchPtr->canvasPtr->hotPrevPtr;
if ((itemPtr == NULL) || (itemPtr->id != searchPtr->id)
|| (lastPtr == NULL) || (lastPtr->nextPtr != itemPtr)) {
entryPtr = Tcl_FindHashEntry(&searchPtr->canvasPtr->idTable,
INT2PTR(searchPtr->id));
if (entryPtr != NULL) {
itemPtr = Tcl_GetHashValue(entryPtr);
lastPtr = itemPtr->prevPtr;
} else {
lastPtr = itemPtr = NULL;
}
}
searchPtr->lastPtr = lastPtr;
searchPtr->searchOver = 1;
searchPtr->canvasPtr->hotPtr = itemPtr;
searchPtr->canvasPtr->hotPrevPtr = lastPtr;
return itemPtr;
}
if (searchPtr->type == SEARCH_TYPE_ALL) {
/*
* All items match.
*/
searchPtr->lastPtr = NULL;
searchPtr->currentPtr = searchPtr->canvasPtr->firstItemPtr;
return searchPtr->canvasPtr->firstItemPtr;
}
if (searchPtr->type == SEARCH_TYPE_TAG) {
/*
* Optimized single-tag search
*/
uid = searchPtr->expr->uid;
for (lastPtr = NULL, itemPtr = searchPtr->canvasPtr->firstItemPtr;
itemPtr != NULL; lastPtr=itemPtr, itemPtr=itemPtr->nextPtr) {
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (*tagPtr == uid) {
searchPtr->lastPtr = lastPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
}
}
} else {
/*
* None of the above. Search for an item matching the tag expression.
*/
for (lastPtr = NULL, itemPtr = searchPtr->canvasPtr->firstItemPtr;
itemPtr != NULL; lastPtr = itemPtr, itemPtr = itemPtr->nextPtr) {
searchPtr->expr->index = 0;
if (TagSearchEvalExpr(searchPtr->expr, itemPtr)) {
searchPtr->lastPtr = lastPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
}
}
searchPtr->lastPtr = lastPtr;
searchPtr->searchOver = 1;
return NULL;
}
/*
*--------------------------------------------------------------
*
* TagSearchNext --
*
* This function returns successive items that match a given tag; it
* should be called only after TagSearchFirst has been used to begin a
* search.
*
* Results:
* The return value is a pointer to the next item that matches the tag
* expr specified to TagSearchScan, or NULL if no such item exists.
* *SearchPtr is updated so that the next call to this function will
* return the next item.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static Tk_Item *
TagSearchNext(
TagSearch *searchPtr) /* Record describing search in progress. */
{
Tk_Item *itemPtr, *lastPtr;
Tk_Uid uid, *tagPtr;
int count;
/*
* Find next item in list (this may not actually be a suitable one to
* return), and return if there are no items left.
*/
lastPtr = searchPtr->lastPtr;
if (lastPtr == NULL) {
itemPtr = searchPtr->canvasPtr->firstItemPtr;
} else {
itemPtr = lastPtr->nextPtr;
}
if ((itemPtr == NULL) || (searchPtr->searchOver)) {
searchPtr->searchOver = 1;
return NULL;
}
if (itemPtr != searchPtr->currentPtr) {
/*
* The structure of the list has changed. Probably the previously-
* returned item was removed from the list. In this case, don't
* advance lastPtr; just return its new successor (i.e. do nothing
* here).
*/
} else {
lastPtr = itemPtr;
itemPtr = lastPtr->nextPtr;
}
if (searchPtr->type == SEARCH_TYPE_ALL) {
/*
* All items match.
*/
searchPtr->lastPtr = lastPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
if (searchPtr->type == SEARCH_TYPE_TAG) {
/*
* Optimized single-tag search
*/
uid = searchPtr->expr->uid;
for (; itemPtr != NULL; lastPtr = itemPtr, itemPtr = itemPtr->nextPtr) {
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (*tagPtr == uid) {
searchPtr->lastPtr = lastPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
}
}
searchPtr->lastPtr = lastPtr;
searchPtr->searchOver = 1;
return NULL;
}
/*
* Else.... evaluate tag expression
*/
for ( ; itemPtr != NULL; lastPtr = itemPtr, itemPtr = itemPtr->nextPtr) {
searchPtr->expr->index = 0;
if (TagSearchEvalExpr(searchPtr->expr, itemPtr)) {
searchPtr->lastPtr = lastPtr;
searchPtr->currentPtr = itemPtr;
return itemPtr;
}
}
searchPtr->lastPtr = lastPtr;
searchPtr->searchOver = 1;
return NULL;
}
/*
*--------------------------------------------------------------
*
* DoItem --
*
* This is a utility function called by FindItems. It either adds
* itemPtr's id to the list being constructed, or it adds a new tag to
* itemPtr, depending on the value of tag.
*
* Results:
* None.
*
* Side effects:
* If tag is NULL then itemPtr's id is added as an element to the
* supplied object; otherwise tag is added to itemPtr's list of tags.
*
*--------------------------------------------------------------
*/
static void
DoItem(
Tcl_Obj *accumObj, /* Object in which to (possibly) record item
* id. */
Tk_Item *itemPtr, /* Item to (possibly) modify. */
Tk_Uid tag) /* Tag to add to those already present for
* item, or NULL. */
{
Tk_Uid *tagPtr;
int count;
/*
* Handle the "add-to-result" case and return, if appropriate.
*/
if (tag == NULL) {
Tcl_ListObjAppendElement(NULL, accumObj, Tcl_NewWideIntObj(itemPtr->id));
return;
}
for (tagPtr = itemPtr->tagPtr, count = itemPtr->numTags;
count > 0; tagPtr++, count--) {
if (tag == *tagPtr) {
return;
}
}
/*
* Grow the tag space if there's no more room left in the current block.
*/
if (itemPtr->tagSpace == itemPtr->numTags) {
Tk_Uid *newTagPtr;
itemPtr->tagSpace += 5;
newTagPtr = ckalloc(itemPtr->tagSpace * sizeof(Tk_Uid));
memcpy((void *) newTagPtr, itemPtr->tagPtr,
itemPtr->numTags * sizeof(Tk_Uid));
if (itemPtr->tagPtr != itemPtr->staticTagSpace) {
ckfree(itemPtr->tagPtr);
}
itemPtr->tagPtr = newTagPtr;
tagPtr = &itemPtr->tagPtr[itemPtr->numTags];
}
/*
* Add in the new tag.
*/
*tagPtr = tag;
itemPtr->numTags++;
}
/*
*--------------------------------------------------------------
*
* FindItems --
*
* This function does all the work of implementing the "find" and
* "addtag" options of the canvas widget command, which locate items that
* have certain features (location, tags, position in display list, etc.)
*
* Results:
* A standard Tcl return value. If newTag is NULL, then a list of ids
* from all the items that match objc/objv is returned in the interp's
* result. If newTag is NULL, then the normal the interp's result is an
* empty string. If an error occurs, then the interp's result will hold
* an error message.
*
* Side effects:
* If newTag is non-NULL, then all the items that match the information
* in objc/objv have that tag added to their lists of tags.
*
*--------------------------------------------------------------
*/
static int
FindItems(
Tcl_Interp *interp, /* Interpreter for error reporting. */
TkCanvas *canvasPtr, /* Canvas whose items are to be searched. */
int objc, /* Number of entries in argv. Must be greater
* than zero. */
Tcl_Obj *const *objv, /* Arguments that describe what items to
* search for (see user doc on "find" and
* "addtag" options). */
Tcl_Obj *newTag, /* If non-NULL, gives new tag to set on all
* found items; if NULL, then ids of found
* items are returned in the interp's
* result. */
int first /* For error messages: gives number of
* elements of objv which are already
* handled. */
,TagSearch **searchPtrPtr /* From CanvasWidgetCmd local vars*/
)
{
Tk_Item *itemPtr;
Tk_Uid uid;
int index, result;
Tcl_Obj *resultObj;
static const char *const optionStrings[] = {
"above", "all", "below", "closest",
"enclosed", "overlapping", "withtag", NULL
};
enum options {
CANV_ABOVE, CANV_ALL, CANV_BELOW, CANV_CLOSEST,
CANV_ENCLOSED, CANV_OVERLAPPING, CANV_WITHTAG
};
if (newTag != NULL) {
uid = Tk_GetUid(Tcl_GetString(newTag));
} else {
uid = NULL;
}
if (Tcl_GetIndexFromObj(interp, objv[first], optionStrings,
"search command", 0, &index) != TCL_OK) {
return TCL_ERROR;
}
switch ((enum options) index) {
case CANV_ABOVE: {
Tk_Item *lastPtr = NULL;
if (objc != first+2) {
Tcl_WrongNumArgs(interp, first+1, objv, "tagOrId");
return TCL_ERROR;
}
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[first+1], searchPtrPtr,
return TCL_ERROR) {
lastPtr = itemPtr;
}
if ((lastPtr != NULL) && (lastPtr->nextPtr != NULL)) {
resultObj = Tcl_NewObj();
DoItem(resultObj, lastPtr->nextPtr, uid);
Tcl_SetObjResult(interp, resultObj);
}
break;
}
case CANV_ALL:
if (objc != first+1) {
Tcl_WrongNumArgs(interp, first+1, objv, NULL);
return TCL_ERROR;
}
resultObj = Tcl_NewObj();
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
DoItem(resultObj, itemPtr, uid);
}
Tcl_SetObjResult(interp, resultObj);
break;
case CANV_BELOW:
if (objc != first+2) {
Tcl_WrongNumArgs(interp, first+1, objv, "tagOrId");
return TCL_ERROR;
}
FIRST_CANVAS_ITEM_MATCHING(objv[first+1], searchPtrPtr,
return TCL_ERROR);
if ((itemPtr != NULL) && (itemPtr->prevPtr != NULL)) {
resultObj = Tcl_NewObj();
DoItem(resultObj, itemPtr->prevPtr, uid);
Tcl_SetObjResult(interp, resultObj);
}
break;
case CANV_CLOSEST: {
double closestDist;
Tk_Item *startPtr, *closestPtr;
double coords[2], halo;
int x1, y1, x2, y2;
if ((objc < first+3) || (objc > first+5)) {
Tcl_WrongNumArgs(interp, first+1, objv, "x y ?halo? ?start?");
return TCL_ERROR;
}
if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[first+1], &coords[0]) != TCL_OK
|| Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[first+2], &coords[1]) != TCL_OK) {
return TCL_ERROR;
}
if (objc > first+3) {
if (Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr,
objv[first+3], &halo) != TCL_OK) {
return TCL_ERROR;
}
if (halo < 0.0) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"can't have negative halo value \"%f\"", halo));
return TCL_ERROR;
}
} else {
halo = 0.0;
}
/*
* Find the item at which to start the search.
*/
startPtr = canvasPtr->firstItemPtr;
if (objc == first+5) {
FIRST_CANVAS_ITEM_MATCHING(objv[first+4], searchPtrPtr,
return TCL_ERROR);
if (itemPtr != NULL) {
startPtr = itemPtr;
}
}
/*
* The code below is optimized so that it can eliminate most items
* without having to call their item-specific functions. This is done
* by keeping a bounding box (x1, y1, x2, y2) that an item's bbox must
* overlap if the item is to have any chance of being closer than the
* closest so far.
*/
itemPtr = startPtr;
while(itemPtr && (itemPtr->state == TK_STATE_HIDDEN ||
(itemPtr->state == TK_STATE_NULL &&
canvasPtr->canvas_state == TK_STATE_HIDDEN))) {
itemPtr = itemPtr->nextPtr;
}
if (itemPtr == NULL) {
return TCL_OK;
}
closestDist = ItemPoint(canvasPtr, itemPtr, coords, halo);
while (1) {
double newDist;
/*
* Update the bounding box using itemPtr, which is the new closest
* item.
*/
x1 = (int) (coords[0] - closestDist - halo - 1);
y1 = (int) (coords[1] - closestDist - halo - 1);
x2 = (int) (coords[0] + closestDist + halo + 1);
y2 = (int) (coords[1] + closestDist + halo + 1);
closestPtr = itemPtr;
/*
* Search for an item that beats the current closest one. Work
* circularly through the canvas's item list until getting back to
* the starting item.
*/
while (1) {
itemPtr = itemPtr->nextPtr;
if (itemPtr == NULL) {
itemPtr = canvasPtr->firstItemPtr;
}
if (itemPtr == startPtr) {
resultObj = Tcl_NewObj();
DoItem(resultObj, closestPtr, uid);
Tcl_SetObjResult(interp, resultObj);
return TCL_OK;
}
if (itemPtr->state == TK_STATE_HIDDEN ||
(itemPtr->state == TK_STATE_NULL &&
canvasPtr->canvas_state == TK_STATE_HIDDEN)) {
continue;
}
if ((itemPtr->x1 >= x2) || (itemPtr->x2 <= x1)
|| (itemPtr->y1 >= y2) || (itemPtr->y2 <= y1)) {
continue;
}
newDist = ItemPoint(canvasPtr, itemPtr, coords, halo);
if (newDist <= closestDist) {
closestDist = newDist;
break;
}
}
}
break;
}
case CANV_ENCLOSED:
if (objc != first+5) {
Tcl_WrongNumArgs(interp, first+1, objv, "x1 y1 x2 y2");
return TCL_ERROR;
}
return FindArea(interp, canvasPtr, objv+first+1, uid, 1);
case CANV_OVERLAPPING:
if (objc != first+5) {
Tcl_WrongNumArgs(interp, first+1, objv, "x1 y1 x2 y2");
return TCL_ERROR;
}
return FindArea(interp, canvasPtr, objv+first+1, uid, 0);
case CANV_WITHTAG:
if (objc != first+2) {
Tcl_WrongNumArgs(interp, first+1, objv, "tagOrId");
return TCL_ERROR;
}
resultObj = Tcl_NewObj();
FOR_EVERY_CANVAS_ITEM_MATCHING(objv[first+1], searchPtrPtr,
goto badWithTagSearch) {
DoItem(resultObj, itemPtr, uid);
}
Tcl_SetObjResult(interp, resultObj);
return TCL_OK;
badWithTagSearch:
Tcl_DecrRefCount(resultObj);
return TCL_ERROR;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* FindArea --
*
* This function implements area searches for the "find" and "addtag"
* options.
*
* Results:
* A standard Tcl return value. If newTag is NULL, then a list of ids
* from all the items overlapping or enclosed by the rectangle given by
* objc is returned in the interp's result. If newTag is NULL, then the
* normal the interp's result is an empty string. If an error occurs,
* then the interp's result will hold an error message.
*
* Side effects:
* If uid is non-NULL, then all the items overlapping or enclosed by the
* area in objv have that tag added to their lists of tags.
*
*--------------------------------------------------------------
*/
static int
FindArea(
Tcl_Interp *interp, /* Interpreter for error reporting and result
* storing. */
TkCanvas *canvasPtr, /* Canvas whose items are to be searched. */
Tcl_Obj *const *objv, /* Array of four arguments that give the
* coordinates of the rectangular area to
* search. */
Tk_Uid uid, /* If non-NULL, gives new tag to set on all
* found items; if NULL, then ids of found
* items are returned in the interp's
* result. */
int enclosed) /* 0 means overlapping or enclosed items are
* OK, 1 means only enclosed items are OK. */
{
double rect[4], tmp;
int x1, y1, x2, y2;
Tk_Item *itemPtr;
Tcl_Obj *resultObj;
if ((Tk_CanvasGetCoordFromObj(interp, (Tk_Canvas) canvasPtr, objv[0],
&rect[0]) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp,(Tk_Canvas)canvasPtr,objv[1],
&rect[1]) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp,(Tk_Canvas)canvasPtr,objv[2],
&rect[2]) != TCL_OK)
|| (Tk_CanvasGetCoordFromObj(interp,(Tk_Canvas)canvasPtr,objv[3],
&rect[3]) != TCL_OK)) {
return TCL_ERROR;
}
if (rect[0] > rect[2]) {
tmp = rect[0]; rect[0] = rect[2]; rect[2] = tmp;
}
if (rect[1] > rect[3]) {
tmp = rect[1]; rect[1] = rect[3]; rect[3] = tmp;
}
/*
* Use an integer bounding box for a quick test, to avoid calling
* item-specific code except for items that are close.
*/
x1 = (int) (rect[0] - 1.0);
y1 = (int) (rect[1] - 1.0);
x2 = (int) (rect[2] + 1.0);
y2 = (int) (rect[3] + 1.0);
resultObj = Tcl_NewObj();
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if (itemPtr->state == TK_STATE_HIDDEN ||
(itemPtr->state == TK_STATE_NULL
&& canvasPtr->canvas_state == TK_STATE_HIDDEN)) {
continue;
}
if ((itemPtr->x1 >= x2) || (itemPtr->x2 <= x1)
|| (itemPtr->y1 >= y2) || (itemPtr->y2 <= y1)) {
continue;
}
if (ItemOverlap(canvasPtr, itemPtr, rect) >= enclosed) {
DoItem(resultObj, itemPtr, uid);
}
}
Tcl_SetObjResult(interp, resultObj);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* RelinkItems --
*
* Move one or more items to a different place in the display order for a
* canvas.
*
* Results:
* None.
*
* Side effects:
* The items identified by "tag" are moved so that they are all together
* in the display list and immediately after prevPtr. The order of the
* moved items relative to each other is not changed.
*
*--------------------------------------------------------------
*/
static int
RelinkItems(
TkCanvas *canvasPtr, /* Canvas to be modified. */
Tcl_Obj *tag, /* Tag identifying items to be moved in the
* redisplay list. */
Tk_Item *prevPtr, /* Reposition the items so that they go just
* after this item (NULL means put at
* beginning of list). */
TagSearch **searchPtrPtr) /* From CanvasWidgetCmd local vars */
{
Tk_Item *itemPtr;
Tk_Item *firstMovePtr, *lastMovePtr;
int result;
/*
* Find all of the items to be moved and remove them from the list, making
* an auxiliary list running from firstMovePtr to lastMovePtr. Record
* their areas for redisplay.
*/
firstMovePtr = lastMovePtr = NULL;
FOR_EVERY_CANVAS_ITEM_MATCHING(tag, searchPtrPtr, return TCL_ERROR) {
if (itemPtr == prevPtr) {
/*
* Item after which insertion is to occur is being moved! Switch
* to insert after its predecessor.
*/
prevPtr = prevPtr->prevPtr;
}
if (itemPtr->prevPtr == NULL) {
if (itemPtr->nextPtr != NULL) {
itemPtr->nextPtr->prevPtr = NULL;
}
canvasPtr->firstItemPtr = itemPtr->nextPtr;
} else {
if (itemPtr->nextPtr != NULL) {
itemPtr->nextPtr->prevPtr = itemPtr->prevPtr;
}
itemPtr->prevPtr->nextPtr = itemPtr->nextPtr;
}
if (canvasPtr->lastItemPtr == itemPtr) {
canvasPtr->lastItemPtr = itemPtr->prevPtr;
}
if (firstMovePtr == NULL) {
itemPtr->prevPtr = NULL;
firstMovePtr = itemPtr;
} else {
itemPtr->prevPtr = lastMovePtr;
lastMovePtr->nextPtr = itemPtr;
}
lastMovePtr = itemPtr;
EventuallyRedrawItem(canvasPtr, itemPtr);
canvasPtr->flags |= REPICK_NEEDED;
}
/*
* Insert the list of to-be-moved items back into the canvas's at the
* desired position.
*/
if (firstMovePtr == NULL) {
return TCL_OK;
}
if (prevPtr == NULL) {
if (canvasPtr->firstItemPtr != NULL) {
canvasPtr->firstItemPtr->prevPtr = lastMovePtr;
}
lastMovePtr->nextPtr = canvasPtr->firstItemPtr;
canvasPtr->firstItemPtr = firstMovePtr;
} else {
if (prevPtr->nextPtr != NULL) {
prevPtr->nextPtr->prevPtr = lastMovePtr;
}
lastMovePtr->nextPtr = prevPtr->nextPtr;
if (firstMovePtr != NULL) {
firstMovePtr->prevPtr = prevPtr;
}
prevPtr->nextPtr = firstMovePtr;
}
if (canvasPtr->lastItemPtr == prevPtr) {
canvasPtr->lastItemPtr = lastMovePtr;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* CanvasBindProc --
*
* This function is invoked by the Tk dispatcher to handle events
* associated with bindings on items.
*
* Results:
* None.
*
* Side effects:
* Depends on the command invoked as part of the binding (if there was
* any).
*
*--------------------------------------------------------------
*/
static void
CanvasBindProc(
ClientData clientData, /* Pointer to canvas structure. */
XEvent *eventPtr) /* Pointer to X event that just happened. */
{
TkCanvas *canvasPtr = clientData;
unsigned long mask;
Tcl_Preserve(canvasPtr);
/*
* This code below keeps track of the current modifier state in
* canvasPtr>state. This information is used to defer repicks of the
* current item while buttons are down.
*/
switch (eventPtr->type) {
case ButtonPress:
case ButtonRelease:
mask = TkGetButtonMask(eventPtr->xbutton.button);
/*
* For button press events, repick the current item using the button
* state before the event, then process the event. For button release
* events, first process the event, then repick the current item using
* the button state *after* the event (the button has logically gone
* up before we change the current item).
*/
if (eventPtr->type == ButtonPress) {
/*
* On a button press, first repick the current item using the
* button state before the event, the process the event.
*/
canvasPtr->state = eventPtr->xbutton.state;
PickCurrentItem(canvasPtr, eventPtr);
canvasPtr->state ^= mask;
CanvasDoEvent(canvasPtr, eventPtr);
} else {
/*
* Button release: first process the event, with the button still
* considered to be down. Then repick the current item under the
* assumption that the button is no longer down.
*/
canvasPtr->state = eventPtr->xbutton.state;
CanvasDoEvent(canvasPtr, eventPtr);
eventPtr->xbutton.state ^= mask;
canvasPtr->state = eventPtr->xbutton.state;
PickCurrentItem(canvasPtr, eventPtr);
eventPtr->xbutton.state ^= mask;
}
break;
case EnterNotify:
case LeaveNotify:
canvasPtr->state = eventPtr->xcrossing.state;
PickCurrentItem(canvasPtr, eventPtr);
break;
case MotionNotify:
canvasPtr->state = eventPtr->xmotion.state;
PickCurrentItem(canvasPtr, eventPtr);
/* fallthrough */
default:
CanvasDoEvent(canvasPtr, eventPtr);
}
Tcl_Release(canvasPtr);
}
/*
*--------------------------------------------------------------
*
* PickCurrentItem --
*
* Find the topmost item in a canvas that contains a given location and
* mark the the current item. If the current item has changed, generate a
* fake exit event on the old current item, a fake enter event on the new
* current item item and force a redraw of the two items. Canvas items
* that are hidden or disabled are ignored.
*
* Results:
* None.
*
* Side effects:
* The current item for canvasPtr may change. If it does, then the
* commands associated with item entry and exit could do just about
* anything. A binding script could delete the canvas, so callers should
* protect themselves with Tcl_Preserve and Tcl_Release.
*
*--------------------------------------------------------------
*/
static void
PickCurrentItem(
TkCanvas *canvasPtr, /* Canvas widget in which to select current
* item. */
XEvent *eventPtr) /* Event describing location of mouse cursor.
* Must be EnterWindow, LeaveWindow,
* ButtonRelease, or MotionNotify. */
{
double coords[2];
unsigned long buttonDown;
Tk_Item *prevItemPtr;
SearchUids *searchUids = GetStaticUids();
/*
* Check whether or not a button is down. If so, we'll log entry and exit
* into and out of the current item, but not entry into any other item.
* This implements a form of grabbing equivalent to what the X server does
* for windows.
*/
buttonDown = canvasPtr->state & ALL_BUTTONS;
/*
* Save information about this event in the canvas. The event in the
* canvas is used for two purposes:
*
* 1. Event bindings: if the current item changes, fake events are
* generated to allow item-enter and item-leave bindings to trigger.
* 2. Reselection: if the current item gets deleted, can use the saved
* event to find a new current item.
*
* Translate MotionNotify events into EnterNotify events, since that's
* what gets reported to item handlers.
*/
if (eventPtr != &canvasPtr->pickEvent) {
if ((eventPtr->type == MotionNotify)
|| (eventPtr->type == ButtonRelease)) {
canvasPtr->pickEvent.xcrossing.type = EnterNotify;
canvasPtr->pickEvent.xcrossing.serial = eventPtr->xmotion.serial;
canvasPtr->pickEvent.xcrossing.send_event
= eventPtr->xmotion.send_event;
canvasPtr->pickEvent.xcrossing.display = eventPtr->xmotion.display;
canvasPtr->pickEvent.xcrossing.window = eventPtr->xmotion.window;
canvasPtr->pickEvent.xcrossing.root = eventPtr->xmotion.root;
canvasPtr->pickEvent.xcrossing.subwindow = None;
canvasPtr->pickEvent.xcrossing.time = eventPtr->xmotion.time;
canvasPtr->pickEvent.xcrossing.x = eventPtr->xmotion.x;
canvasPtr->pickEvent.xcrossing.y = eventPtr->xmotion.y;
canvasPtr->pickEvent.xcrossing.x_root = eventPtr->xmotion.x_root;
canvasPtr->pickEvent.xcrossing.y_root = eventPtr->xmotion.y_root;
canvasPtr->pickEvent.xcrossing.mode = NotifyNormal;
canvasPtr->pickEvent.xcrossing.detail = NotifyNonlinear;
canvasPtr->pickEvent.xcrossing.same_screen =
eventPtr->xmotion.same_screen;
canvasPtr->pickEvent.xcrossing.focus = False;
canvasPtr->pickEvent.xcrossing.state = eventPtr->xmotion.state;
} else {
canvasPtr->pickEvent = *eventPtr;
}
}
/*
* If this is a recursive call (there's already a partially completed call
* pending on the stack; it's in the middle of processing a Leave event
* handler for the old current item) then just return; the pending call
* will do everything that's needed.
*/
if (canvasPtr->flags & REPICK_IN_PROGRESS) {
return;
}
/*
* A LeaveNotify event automatically means that there's no current object,
* so the check for closest item can be skipped.
*/
coords[0] = canvasPtr->pickEvent.xcrossing.x + canvasPtr->xOrigin;
coords[1] = canvasPtr->pickEvent.xcrossing.y + canvasPtr->yOrigin;
if (canvasPtr->pickEvent.type != LeaveNotify) {
canvasPtr->newCurrentPtr = CanvasFindClosest(canvasPtr, coords);
} else {
canvasPtr->newCurrentPtr = NULL;
}
if ((canvasPtr->newCurrentPtr == canvasPtr->currentItemPtr)
&& !(canvasPtr->flags & LEFT_GRABBED_ITEM)) {
/*
* Nothing to do: the current item hasn't changed.
*/
return;
}
if (!buttonDown) {
canvasPtr->flags &= ~LEFT_GRABBED_ITEM;
}
/*
* Simulate a LeaveNotify event on the previous current item and an
* EnterNotify event on the new current item. Remove the "current" tag
* from the previous current item and place it on the new current item.
*/
if ((canvasPtr->newCurrentPtr != canvasPtr->currentItemPtr)
&& (canvasPtr->currentItemPtr != NULL)
&& !(canvasPtr->flags & LEFT_GRABBED_ITEM)) {
XEvent event;
Tk_Item *itemPtr = canvasPtr->currentItemPtr;
int i;
event = canvasPtr->pickEvent;
event.type = LeaveNotify;
/*
* If the event's detail happens to be NotifyInferior the binding
* mechanism will discard the event. To be consistent, always use
* NotifyAncestor.
*/
event.xcrossing.detail = NotifyAncestor;
canvasPtr->flags |= REPICK_IN_PROGRESS;
CanvasDoEvent(canvasPtr, &event);
canvasPtr->flags &= ~REPICK_IN_PROGRESS;
/*
* The check below is needed because there could be an event handler
* for <LeaveNotify> that deletes the current item.
*/
if ((itemPtr == canvasPtr->currentItemPtr) && !buttonDown) {
for (i = itemPtr->numTags-1; i >= 0; i--) {
if (itemPtr->tagPtr[i] == searchUids->currentUid)
/* then */ {
itemPtr->tagPtr[i] = itemPtr->tagPtr[itemPtr->numTags-1];
itemPtr->numTags--;
break;
}
}
}
/*
* Note: during CanvasDoEvent above, it's possible that
* canvasPtr->newCurrentPtr got reset to NULL because the item was
* deleted.
*/
}
if ((canvasPtr->newCurrentPtr!=canvasPtr->currentItemPtr) && buttonDown) {
canvasPtr->flags |= LEFT_GRABBED_ITEM;
return;
}
/*
* Special note: it's possible that canvasPtr->newCurrentPtr ==
* canvasPtr->currentItemPtr here. This can happen, for example, if
* LEFT_GRABBED_ITEM was set.
*/
prevItemPtr = canvasPtr->currentItemPtr;
canvasPtr->flags &= ~LEFT_GRABBED_ITEM;
canvasPtr->currentItemPtr = canvasPtr->newCurrentPtr;
if (prevItemPtr != NULL && prevItemPtr != canvasPtr->currentItemPtr &&
(prevItemPtr->redraw_flags & TK_ITEM_STATE_DEPENDANT)) {
EventuallyRedrawItem(canvasPtr, prevItemPtr);
ItemConfigure(canvasPtr, prevItemPtr, 0, NULL);
}
if (canvasPtr->currentItemPtr != NULL) {
XEvent event;
DoItem(NULL, canvasPtr->currentItemPtr, searchUids->currentUid);
if ((canvasPtr->currentItemPtr->redraw_flags & TK_ITEM_STATE_DEPENDANT
&& prevItemPtr != canvasPtr->currentItemPtr)) {
ItemConfigure(canvasPtr, canvasPtr->currentItemPtr, 0, NULL);
EventuallyRedrawItem(canvasPtr, canvasPtr->currentItemPtr);
}
event = canvasPtr->pickEvent;
event.type = EnterNotify;
event.xcrossing.detail = NotifyAncestor;
CanvasDoEvent(canvasPtr, &event);
}
}
/*
*----------------------------------------------------------------------
*
* CanvasFindClosest --
*
* Given x and y coordinates, find the topmost canvas item that is
* "close" to the coordinates. Canvas items that are hidden or disabled
* are ignored.
*
* Results:
* The return value is a pointer to the topmost item that is close to
* (x,y), or NULL if no item is close.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static Tk_Item *
CanvasFindClosest(
TkCanvas *canvasPtr, /* Canvas widget to search. */
double coords[2]) /* Desired x,y position in canvas, not screen,
* coordinates.) */
{
Tk_Item *itemPtr;
Tk_Item *bestPtr;
int x1, y1, x2, y2;
x1 = (int) (coords[0] - canvasPtr->closeEnough);
y1 = (int) (coords[1] - canvasPtr->closeEnough);
x2 = (int) (coords[0] + canvasPtr->closeEnough);
y2 = (int) (coords[1] + canvasPtr->closeEnough);
bestPtr = NULL;
for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL;
itemPtr = itemPtr->nextPtr) {
if (itemPtr->state == TK_STATE_HIDDEN ||
itemPtr->state==TK_STATE_DISABLED ||
(itemPtr->state == TK_STATE_NULL &&
(canvasPtr->canvas_state == TK_STATE_HIDDEN ||
canvasPtr->canvas_state == TK_STATE_DISABLED))) {
continue;
}
if ((itemPtr->x1 > x2) || (itemPtr->x2 < x1)
|| (itemPtr->y1 > y2) || (itemPtr->y2 < y1)) {
continue;
}
if (ItemPoint(canvasPtr,itemPtr,coords,0) <= canvasPtr->closeEnough) {
bestPtr = itemPtr;
}
}
return bestPtr;
}
/*
*--------------------------------------------------------------
*
* CanvasDoEvent --
*
* This function is called to invoke binding processing for a new event
* that is associated with the current item for a canvas.
*
* Results:
* None.
*
* Side effects:
* Depends on the bindings for the canvas. A binding script could delete
* the canvas, so callers should protect themselves with Tcl_Preserve and
* Tcl_Release.
*
*--------------------------------------------------------------
*/
static void
CanvasDoEvent(
TkCanvas *canvasPtr, /* Canvas widget in which event occurred. */
XEvent *eventPtr) /* Real or simulated X event that is to be
* processed. */
{
#define NUM_STATIC 3
void *staticObjects[NUM_STATIC];
void **objectPtr;
int numObjects, i;
Tk_Item *itemPtr;
TagSearchExpr *expr;
int numExprs;
SearchUids *searchUids = GetStaticUids();
if (canvasPtr->bindingTable == NULL) {
return;
}
itemPtr = canvasPtr->currentItemPtr;
if ((eventPtr->type == KeyPress) || (eventPtr->type == KeyRelease)) {
itemPtr = canvasPtr->textInfo.focusItemPtr;
}
if (itemPtr == NULL) {
return;
}
/*
* Set up an array with all the relevant objects for processing this
* event. The relevant objects are:
* (a) the event's item,
* (b) the tags associated with the event's item,
* (c) the expressions that are true for the event's item's tags, and
* (d) the tag "all".
*
* If there are a lot of tags then malloc an array to hold all of the
* objects.
*/
/*
* Flag and count all expressions that match item's tags.
*/
numExprs = 0;
expr = canvasPtr->bindTagExprs;
while (expr) {
expr->index = 0;
expr->match = TagSearchEvalExpr(expr, itemPtr);
if (expr->match) {
numExprs++;
}
expr = expr->next;
}
numObjects = itemPtr->numTags + numExprs + 2;
if (numObjects <= NUM_STATIC) {
objectPtr = staticObjects;
} else {
objectPtr = ckalloc(numObjects * sizeof(void *));
}
objectPtr[0] = (char *)searchUids->allUid;
for (i = itemPtr->numTags-1; i >= 0; i--) {
objectPtr[i+1] = (char *)itemPtr->tagPtr[i];
}
objectPtr[itemPtr->numTags+1] = itemPtr;
/*
* Copy uids of matching expressions into object array
*/
i = itemPtr->numTags+2;
expr = canvasPtr->bindTagExprs;
while (expr) {
if (expr->match) {
objectPtr[i++] = (int *) expr->uid;
}
expr = expr->next;
}
/*
* Invoke the binding system, then free up the object array if it was
* malloc-ed.
*/
if (canvasPtr->tkwin != NULL) {
Tk_BindEvent(canvasPtr->bindingTable, eventPtr, canvasPtr->tkwin,
numObjects, objectPtr);
}
if (objectPtr != staticObjects) {
ckfree(objectPtr);
}
}
/*
*----------------------------------------------------------------------
*
* CanvasBlinkProc --
*
* This function is called as a timer handler to blink the insertion
* cursor off and on.
*
* Results:
* None.
*
* Side effects:
* The cursor gets turned on or off, redisplay gets invoked, and this
* function reschedules itself.
*
*----------------------------------------------------------------------
*/
static void
CanvasBlinkProc(
ClientData clientData) /* Pointer to record describing entry. */
{
TkCanvas *canvasPtr = clientData;
if (!canvasPtr->textInfo.gotFocus || (canvasPtr->insertOffTime == 0)) {
return;
}
if (canvasPtr->textInfo.cursorOn) {
canvasPtr->textInfo.cursorOn = 0;
canvasPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
canvasPtr->insertOffTime, CanvasBlinkProc, canvasPtr);
} else {
canvasPtr->textInfo.cursorOn = 1;
canvasPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
canvasPtr->insertOnTime, CanvasBlinkProc, canvasPtr);
}
EventuallyRedrawItem(canvasPtr, canvasPtr->textInfo.focusItemPtr);
}
/*
*----------------------------------------------------------------------
*
* CanvasFocusProc --
*
* This function is called whenever a canvas gets or loses the input
* focus. It's also called whenever the window is reconfigured while it
* has the focus.
*
* Results:
* None.
*
* Side effects:
* The cursor gets turned on or off.
*
*----------------------------------------------------------------------
*/
static void
CanvasFocusProc(
TkCanvas *canvasPtr, /* Canvas that just got or lost focus. */
int gotFocus) /* 1 means window is getting focus, 0 means
* it's losing it. */
{
Tcl_DeleteTimerHandler(canvasPtr->insertBlinkHandler);
if (gotFocus) {
canvasPtr->textInfo.gotFocus = 1;
canvasPtr->textInfo.cursorOn = 1;
if (canvasPtr->insertOffTime != 0) {
canvasPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
canvasPtr->insertOffTime, CanvasBlinkProc, canvasPtr);
}
} else {
canvasPtr->textInfo.gotFocus = 0;
canvasPtr->textInfo.cursorOn = 0;
canvasPtr->insertBlinkHandler = NULL;
}
EventuallyRedrawItem(canvasPtr, canvasPtr->textInfo.focusItemPtr);
if (canvasPtr->highlightWidth > 0) {
canvasPtr->flags |= REDRAW_BORDERS;
if (!(canvasPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayCanvas, canvasPtr);
canvasPtr->flags |= REDRAW_PENDING;
}
}
}
/*
*----------------------------------------------------------------------
*
* CanvasSelectTo --
*
* Modify the selection by moving its un-anchored end. This could make
* the selection either larger or smaller.
*
* Results:
* None.
*
* Side effects:
* The selection changes.
*
*----------------------------------------------------------------------
*/
static void
CanvasSelectTo(
TkCanvas *canvasPtr, /* Information about widget. */
Tk_Item *itemPtr, /* Item that is to hold selection. */
int index) /* Index of element that is to become the
* "other" end of the selection. */
{
int oldFirst, oldLast;
Tk_Item *oldSelPtr;
oldFirst = canvasPtr->textInfo.selectFirst;
oldLast = canvasPtr->textInfo.selectLast;
oldSelPtr = canvasPtr->textInfo.selItemPtr;
/*
* Grab the selection if we don't own it already.
*/
if (canvasPtr->textInfo.selItemPtr == NULL) {
Tk_OwnSelection(canvasPtr->tkwin, XA_PRIMARY, CanvasLostSelection,
canvasPtr);
} else if (canvasPtr->textInfo.selItemPtr != itemPtr) {
EventuallyRedrawItem(canvasPtr, canvasPtr->textInfo.selItemPtr);
}
canvasPtr->textInfo.selItemPtr = itemPtr;
if (canvasPtr->textInfo.anchorItemPtr != itemPtr) {
canvasPtr->textInfo.anchorItemPtr = itemPtr;
canvasPtr->textInfo.selectAnchor = index;
}
if (canvasPtr->textInfo.selectAnchor <= index) {
canvasPtr->textInfo.selectFirst = canvasPtr->textInfo.selectAnchor;
canvasPtr->textInfo.selectLast = index;
} else {
canvasPtr->textInfo.selectFirst = index;
canvasPtr->textInfo.selectLast = canvasPtr->textInfo.selectAnchor - 1;
}
if ((canvasPtr->textInfo.selectFirst != oldFirst)
|| (canvasPtr->textInfo.selectLast != oldLast)
|| (itemPtr != oldSelPtr)) {
EventuallyRedrawItem(canvasPtr, itemPtr);
}
}
/*
*--------------------------------------------------------------
*
* CanvasFetchSelection --
*
* This function is invoked by Tk to return part or all of the selection,
* when the selection is in a canvas widget. This function always returns
* the selection as a STRING.
*
* 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
CanvasFetchSelection(
ClientData clientData, /* Information about canvas widget. */
int offset, /* 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. */
{
TkCanvas *canvasPtr = clientData;
return ItemSelection(canvasPtr, canvasPtr->textInfo.selItemPtr, offset,
buffer, maxBytes);
}
/*
*----------------------------------------------------------------------
*
* CanvasLostSelection --
*
* This function is called back by Tk when the selection is grabbed away
* from a canvas widget.
*
* Results:
* None.
*
* Side effects:
* The existing selection is unhighlighted, and the window is marked as
* not containing a selection.
*
*----------------------------------------------------------------------
*/
static void
CanvasLostSelection(
ClientData clientData) /* Information about entry widget. */
{
TkCanvas *canvasPtr = clientData;
EventuallyRedrawItem(canvasPtr, canvasPtr->textInfo.selItemPtr);
canvasPtr->textInfo.selItemPtr = NULL;
}
/*
*--------------------------------------------------------------
*
* GridAlign --
*
* Given a coordinate and a grid spacing, this function computes the
* location of the nearest grid line to the coordinate.
*
* Results:
* The return value is the location of the grid line nearest to coord.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static double
GridAlign(
double coord, /* Coordinate to grid-align. */
double spacing) /* Spacing between grid lines. If <= 0 then no
* alignment is done. */
{
if (spacing <= 0.0) {
return coord;
}
if (coord < 0) {
return -((int) ((-coord)/spacing + 0.5)) * spacing;
}
return ((int) (coord/spacing + 0.5)) * spacing;
}
/*
*----------------------------------------------------------------------
*
* ScrollFractions --
*
* Given the range that's visible in the window and the "100% range" for
* what's in the canvas, return a list of two doubles representing the
* scroll fractions. This function is used for both x and y scrolling.
*
* Results:
* A List Tcl_Obj with two real numbers (Double Tcl_Objs) containing the
* scroll fractions (between 0 and 1) corresponding to the other
* arguments.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static Tcl_Obj *
ScrollFractions(
int screen1, /* Lowest coordinate visible in the window. */
int screen2, /* Highest coordinate visible in the window. */
int object1, /* Lowest coordinate in the object. */
int object2) /* Highest coordinate in the object. */
{
Tcl_Obj *buffer[2];
double range, f1, f2;
range = object2 - object1;
if (range <= 0) {
f1 = 0;
f2 = 1.0;
} else {
f1 = (screen1 - object1)/range;
if (f1 < 0) {
f1 = 0.0;
}
f2 = (screen2 - object1)/range;
if (f2 > 1.0) {
f2 = 1.0;
}
if (f2 < f1) {
f2 = f1;
}
}
buffer[0] = Tcl_NewDoubleObj(f1);
buffer[1] = Tcl_NewDoubleObj(f2);
return Tcl_NewListObj(2, buffer);
}
/*
*--------------------------------------------------------------
*
* CanvasUpdateScrollbars --
*
* This function is invoked whenever a canvas has changed in a way that
* requires scrollbars to be redisplayed (e.g. the view in the canvas has
* changed).
*
* Results:
* None.
*
* Side effects:
* If there are scrollbars associated with the canvas, then their
* scrolling commands are invoked to cause them to redisplay. If errors
* occur, additional Tcl commands may be invoked to process the errors.
*
*--------------------------------------------------------------
*/
static void
CanvasUpdateScrollbars(
TkCanvas *canvasPtr) /* Information about canvas. */
{
int result;
Tcl_Interp *interp;
int xOrigin, yOrigin, inset, width, height;
int scrollX1, scrollX2, scrollY1, scrollY2;
char *xScrollCmd, *yScrollCmd;
Tcl_DString buf;
/*
* Save all the relevant values from the canvasPtr, because it might be
* deleted as part of either of the two calls to Tcl_VarEval below.
*/
interp = canvasPtr->interp;
Tcl_Preserve(interp);
xScrollCmd = canvasPtr->xScrollCmd;
if (xScrollCmd != NULL) {
Tcl_Preserve(xScrollCmd);
}
yScrollCmd = canvasPtr->yScrollCmd;
if (yScrollCmd != NULL) {
Tcl_Preserve(yScrollCmd);
}
xOrigin = canvasPtr->xOrigin;
yOrigin = canvasPtr->yOrigin;
inset = canvasPtr->inset;
width = Tk_Width(canvasPtr->tkwin);
height = Tk_Height(canvasPtr->tkwin);
scrollX1 = canvasPtr->scrollX1;
scrollX2 = canvasPtr->scrollX2;
scrollY1 = canvasPtr->scrollY1;
scrollY2 = canvasPtr->scrollY2;
canvasPtr->flags &= ~UPDATE_SCROLLBARS;
if (canvasPtr->xScrollCmd != NULL) {
Tcl_Obj *fractions = ScrollFractions(xOrigin + inset,
xOrigin + width - inset, scrollX1, scrollX2);
Tcl_DStringInit(&buf);
Tcl_DStringAppend(&buf, xScrollCmd, -1);
Tcl_DStringAppend(&buf, " ", -1);
Tcl_DStringAppend(&buf, Tcl_GetString(fractions), -1);
result = Tcl_EvalEx(interp, Tcl_DStringValue(&buf), -1, 0);
Tcl_DStringFree(&buf);
Tcl_DecrRefCount(fractions);
if (result != TCL_OK) {
Tcl_BackgroundException(interp, result);
}
Tcl_ResetResult(interp);
Tcl_Release(xScrollCmd);
}
if (yScrollCmd != NULL) {
Tcl_Obj *fractions = ScrollFractions(yOrigin + inset,
yOrigin + height - inset, scrollY1, scrollY2);
Tcl_DStringInit(&buf);
Tcl_DStringAppend(&buf, yScrollCmd, -1);
Tcl_DStringAppend(&buf, " ", -1);
Tcl_DStringAppend(&buf, Tcl_GetString(fractions), -1);
result = Tcl_EvalEx(interp, Tcl_DStringValue(&buf), -1, 0);
Tcl_DStringFree(&buf);
Tcl_DecrRefCount(fractions);
if (result != TCL_OK) {
Tcl_BackgroundException(interp, result);
}
Tcl_ResetResult(interp);
Tcl_Release(yScrollCmd);
}
Tcl_Release(interp);
}
/*
*--------------------------------------------------------------
*
* CanvasSetOrigin --
*
* This function is invoked to change the mapping between canvas
* coordinates and screen coordinates in the canvas window.
*
* Results:
* None.
*
* Side effects:
* The canvas will be redisplayed to reflect the change in view. In
* addition, scrollbars will be updated if there are any.
*
*--------------------------------------------------------------
*/
static void
CanvasSetOrigin(
TkCanvas *canvasPtr, /* Information about canvas. */
int xOrigin, /* New X origin for canvas (canvas x-coord
* corresponding to left edge of canvas
* window). */
int yOrigin) /* New Y origin for canvas (canvas y-coord
* corresponding to top edge of canvas
* window). */
{
int left, right, top, bottom, delta;
/*
* If scroll increments have been set, round the window origin to the
* nearest multiple of the increments. Remember, the origin is the place
* just inside the borders, not the upper left corner.
*/
if (canvasPtr->xScrollIncrement > 0) {
if (xOrigin >= 0) {
xOrigin += canvasPtr->xScrollIncrement/2;
xOrigin -= (xOrigin + canvasPtr->inset)
% canvasPtr->xScrollIncrement;
} else {
xOrigin = (-xOrigin) + canvasPtr->xScrollIncrement/2;
xOrigin = -(xOrigin - (xOrigin - canvasPtr->inset)
% canvasPtr->xScrollIncrement);
}
}
if (canvasPtr->yScrollIncrement > 0) {
if (yOrigin >= 0) {
yOrigin += canvasPtr->yScrollIncrement/2;
yOrigin -= (yOrigin + canvasPtr->inset)
% canvasPtr->yScrollIncrement;
} else {
yOrigin = (-yOrigin) + canvasPtr->yScrollIncrement/2;
yOrigin = -(yOrigin - (yOrigin - canvasPtr->inset)
% canvasPtr->yScrollIncrement);
}
}
/*
* Adjust the origin if necessary to keep as much as possible of the
* canvas in the view. The variables left, right, etc. keep track of how
* much extra space there is on each side of the view before it will stick
* out past the scroll region. If one side sticks out past the edge of the
* scroll region, adjust the view to bring that side back to the edge of
* the scrollregion (but don't move it so much that the other side sticks
* out now). If scroll increments are in effect, be sure to adjust only by
* full increments.
*/
if ((canvasPtr->confine) && (canvasPtr->regionString != NULL)) {
left = xOrigin + canvasPtr->inset - canvasPtr->scrollX1;
right = canvasPtr->scrollX2
- (xOrigin + Tk_Width(canvasPtr->tkwin) - canvasPtr->inset);
top = yOrigin + canvasPtr->inset - canvasPtr->scrollY1;
bottom = canvasPtr->scrollY2
- (yOrigin + Tk_Height(canvasPtr->tkwin) - canvasPtr->inset);
if ((left < 0) && (right > 0)) {
delta = (right > -left) ? -left : right;
if (canvasPtr->xScrollIncrement > 0) {
delta -= delta % canvasPtr->xScrollIncrement;
}
xOrigin += delta;
} else if ((right < 0) && (left > 0)) {
delta = (left > -right) ? -right : left;
if (canvasPtr->xScrollIncrement > 0) {
delta -= delta % canvasPtr->xScrollIncrement;
}
xOrigin -= delta;
}
if ((top < 0) && (bottom > 0)) {
delta = (bottom > -top) ? -top : bottom;
if (canvasPtr->yScrollIncrement > 0) {
delta -= delta % canvasPtr->yScrollIncrement;
}
yOrigin += delta;
} else if ((bottom < 0) && (top > 0)) {
delta = (top > -bottom) ? -bottom : top;
if (canvasPtr->yScrollIncrement > 0) {
delta -= delta % canvasPtr->yScrollIncrement;
}
yOrigin -= delta;
}
}
if ((xOrigin == canvasPtr->xOrigin) && (yOrigin == canvasPtr->yOrigin)) {
return;
}
/*
* Tricky point: must redisplay not only everything that's visible in the
* window's final configuration, but also everything that was visible in
* the initial configuration. This is needed because some item types, like
* windows, need to know when they move off-screen so they can explicitly
* undisplay themselves.
*/
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
canvasPtr->xOrigin = xOrigin;
canvasPtr->yOrigin = yOrigin;
canvasPtr->flags |= UPDATE_SCROLLBARS;
Tk_CanvasEventuallyRedraw((Tk_Canvas) canvasPtr,
canvasPtr->xOrigin, canvasPtr->yOrigin,
canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin),
canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin));
}
/*
*----------------------------------------------------------------------
*
* TkGetStringsFromObjs --
*
* Results:
* Converts object list into string list.
*
* Side effects:
* Memory is allocated for the objv array, which must be freed using
* ckfree() when no longer needed.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static const char **
TkGetStringsFromObjs(
int objc,
Tcl_Obj *const objv[])
{
register int i;
const char **argv;
if (objc <= 0) {
return NULL;
}
argv = ckalloc((objc+1) * sizeof(char *));
for (i = 0; i < objc; i++) {
argv[i] = Tcl_GetString(objv[i]);
}
argv[objc] = 0;
return argv;
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasPsColor --
*
* This function is called by individual canvas items when they want to
* set a color value for output. Given information about an X color, this
* function will generate Postscript commands to set up an appropriate
* color in Postscript.
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in interp->result. If no error occurs, then
* additional Postscript will be appended to interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasPsColor(
Tcl_Interp *interp, /* Interpreter for returning Postscript or
* error message. */
Tk_Canvas canvas, /* Information about canvas. */
XColor *colorPtr) /* Information about color. */
{
return Tk_PostscriptColor(interp, Canvas(canvas)->psInfo, colorPtr);
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasPsFont --
*
* This function is called by individual canvas items when they want to
* output text. Given information about an X font, this function will
* generate Postscript commands to set up an appropriate font in
* Postscript.
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in interp->result. If no error occurs, then
* additional Postscript will be appended to the interp->result.
*
* Side effects:
* The Postscript font name is entered into psInfoPtr->fontTable if it
* wasn't already there.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasPsFont(
Tcl_Interp *interp, /* Interpreter for returning Postscript or
* error message. */
Tk_Canvas canvas, /* Information about canvas. */
Tk_Font tkfont) /* Information about font in which text is to
* be printed. */
{
return Tk_PostscriptFont(interp, Canvas(canvas)->psInfo, tkfont);
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasPsBitmap --
*
* This function is called to output the contents of a sub-region of a
* bitmap in proper image data format for Postscript (i.e. data between
* angle brackets, one bit per pixel).
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in interp->result. If no error occurs, then
* additional Postscript will be appended to interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasPsBitmap(
Tcl_Interp *interp, /* Interpreter for returning Postscript or
* error message. */
Tk_Canvas canvas, /* Information about canvas. */
Pixmap bitmap, /* Bitmap for which to generate Postscript. */
int startX, int startY, /* Coordinates of upper-left corner of
* rectangular region to output. */
int width, int height) /* Size of rectangular region. */
{
return Tk_PostscriptBitmap(interp, Canvas(canvas)->tkwin,
Canvas(canvas)->psInfo, bitmap, startX, startY, width, height);
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasPsStipple --
*
* This function is called by individual canvas items when they have
* created a path that they'd like to be filled with a stipple pattern.
* Given information about an X bitmap, this function will generate
* Postscript commands to fill the current clip region using a stipple
* pattern defined by the bitmap.
*
* Results:
* Returns a standard Tcl return value. If an error occurs then an error
* message will be left in interp->result. If no error occurs, then
* additional Postscript will be appended to interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
Tk_CanvasPsStipple(
Tcl_Interp *interp, /* Interpreter for returning Postscript or
* error message. */
Tk_Canvas canvas, /* Information about canvas. */
Pixmap bitmap) /* Bitmap to use for stippling. */
{
return Tk_PostscriptStipple(interp, Canvas(canvas)->tkwin,
Canvas(canvas)->psInfo, bitmap);
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasPsY --
*
* Given a y-coordinate in canvas coordinates, this function returns a
* y-coordinate to use for Postscript output.
*
* Results:
* Returns the Postscript coordinate that corresponds to "y".
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
double
Tk_CanvasPsY(
Tk_Canvas canvas, /* Token for canvas on whose behalf Postscript
* is being generated. */
double y) /* Y-coordinate in canvas coords. */
{
return Tk_PostscriptY(y, Canvas(canvas)->psInfo);
}
/*
*--------------------------------------------------------------
*
* Tk_CanvasPsPath --
*
* Given an array of points for a path, generate Postscript commands to
* create the path.
*
* Results:
* Postscript commands get appended to what's in interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
Tk_CanvasPsPath(
Tcl_Interp *interp, /* Put generated Postscript in this
* interpreter's result field. */
Tk_Canvas canvas, /* Canvas on whose behalf Postscript is being
* generated. */
double *coordPtr, /* Pointer to first in array of 2*numPoints
* coordinates giving points for path. */
int numPoints) /* Number of points at *coordPtr. */
{
Tk_PostscriptPath(interp, Canvas(canvas)->psInfo, coordPtr, numPoints);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/