/* * 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. * * RCS: @(#) $Id: tkCanvas.c,v 1.63 2010/01/18 20:43:38 nijtmans Exp $ */ /* #define USE_OLD_TAG_SEARCH 1 */ #include "default.h" #include "tkInt.h" #include "tkCanvas.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. */ #ifdef USE_OLD_TAG_SEARCH /* * The structure defined below is used to keep track of a tag search in * progress. No field should be accessed by anyone other than StartTagSearch * and NextItem. */ typedef struct TagSearch { TkCanvas *canvasPtr; /* Canvas widget being searched. */ Tk_Uid tag; /* Tag to search for. 0 means return all * items. */ 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. */ } TagSearch; #else /* USE_OLD_TAG_SEARCH */ /* * 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 */ #endif /* USE_OLD_TAG_SEARCH */ /* * Custom option for handling "-state" and "-offset" */ static const Tk_CustomOption stateOption = { TkStateParseProc, TkStatePrintProc, (ClientData) NULL /* Only "normal" and "disabled". */ }; static const Tk_CustomOption offsetOption = { TkOffsetParseProc, TkOffsetPrintProc, (ClientData) TK_OFFSET_RELATIVE }; /* * Information used for argv parsing. */ static Tk_ConfigSpec configSpecs[] = { {TK_CONFIG_BORDER, "-background", "background", "Background", DEF_CANVAS_BG_COLOR, Tk_Offset(TkCanvas, bgBorder), TK_CONFIG_COLOR_ONLY, NULL}, {TK_CONFIG_BORDER, "-background", "background", "Background", DEF_CANVAS_BG_MONO, Tk_Offset(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, Tk_Offset(TkCanvas, borderWidth), 0, NULL}, {TK_CONFIG_DOUBLE, "-closeenough", "closeEnough", "CloseEnough", DEF_CANVAS_CLOSE_ENOUGH, Tk_Offset(TkCanvas, closeEnough), 0, NULL}, {TK_CONFIG_BOOLEAN, "-confine", "confine", "Confine", DEF_CANVAS_CONFINE, Tk_Offset(TkCanvas, confine), 0, NULL}, {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor", DEF_CANVAS_CURSOR, Tk_Offset(TkCanvas, cursor), TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_PIXELS, "-height", "height", "Height", DEF_CANVAS_HEIGHT, Tk_Offset(TkCanvas, height), 0, NULL}, {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground", "HighlightBackground", DEF_CANVAS_HIGHLIGHT_BG, Tk_Offset(TkCanvas, highlightBgColorPtr), 0, NULL}, {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor", DEF_CANVAS_HIGHLIGHT, Tk_Offset(TkCanvas, highlightColorPtr), 0, NULL}, {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness", "HighlightThickness", DEF_CANVAS_HIGHLIGHT_WIDTH, Tk_Offset(TkCanvas, highlightWidth), 0, NULL}, {TK_CONFIG_BORDER, "-insertbackground", "insertBackground", "Foreground", DEF_CANVAS_INSERT_BG, Tk_Offset(TkCanvas, textInfo.insertBorder), 0, NULL}, {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth", DEF_CANVAS_INSERT_BD_COLOR, Tk_Offset(TkCanvas, textInfo.insertBorderWidth), TK_CONFIG_COLOR_ONLY, NULL}, {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth", DEF_CANVAS_INSERT_BD_MONO, Tk_Offset(TkCanvas, textInfo.insertBorderWidth), TK_CONFIG_MONO_ONLY, NULL}, {TK_CONFIG_INT, "-insertofftime", "insertOffTime", "OffTime", DEF_CANVAS_INSERT_OFF_TIME, Tk_Offset(TkCanvas, insertOffTime), 0, NULL}, {TK_CONFIG_INT, "-insertontime", "insertOnTime", "OnTime", DEF_CANVAS_INSERT_ON_TIME, Tk_Offset(TkCanvas, insertOnTime), 0, NULL}, {TK_CONFIG_PIXELS, "-insertwidth", "insertWidth", "InsertWidth", DEF_CANVAS_INSERT_WIDTH, Tk_Offset(TkCanvas, textInfo.insertWidth), 0, NULL}, {TK_CONFIG_CUSTOM, "-offset", "offset", "Offset", "0,0", Tk_Offset(TkCanvas, tsoffset),TK_CONFIG_DONT_SET_DEFAULT, &offsetOption}, {TK_CONFIG_RELIEF, "-relief", "relief", "Relief", DEF_CANVAS_RELIEF, Tk_Offset(TkCanvas, relief), 0, NULL}, {TK_CONFIG_STRING, "-scrollregion", "scrollRegion", "ScrollRegion", DEF_CANVAS_SCROLL_REGION, Tk_Offset(TkCanvas, regionString), TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground", DEF_CANVAS_SELECT_COLOR, Tk_Offset(TkCanvas, textInfo.selBorder), TK_CONFIG_COLOR_ONLY, NULL}, {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground", DEF_CANVAS_SELECT_MONO, Tk_Offset(TkCanvas, textInfo.selBorder), TK_CONFIG_MONO_ONLY, NULL}, {TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth", DEF_CANVAS_SELECT_BD_COLOR, Tk_Offset(TkCanvas, textInfo.selBorderWidth), TK_CONFIG_COLOR_ONLY, NULL}, {TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth", DEF_CANVAS_SELECT_BD_MONO, Tk_Offset(TkCanvas, textInfo.selBorderWidth), TK_CONFIG_MONO_ONLY, NULL}, {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background", DEF_CANVAS_SELECT_FG_COLOR, Tk_Offset(TkCanvas, textInfo.selFgColorPtr), TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background", DEF_CANVAS_SELECT_FG_MONO, Tk_Offset(TkCanvas, textInfo.selFgColorPtr), TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_CUSTOM, "-state", "state", "State", "normal", Tk_Offset(TkCanvas, canvas_state), TK_CONFIG_DONT_SET_DEFAULT, &stateOption}, {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus", DEF_CANVAS_TAKE_FOCUS, Tk_Offset(TkCanvas, takeFocus), TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_PIXELS, "-width", "width", "Width", DEF_CANVAS_WIDTH, Tk_Offset(TkCanvas, width), 0, NULL}, {TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand", DEF_CANVAS_X_SCROLL_CMD, Tk_Offset(TkCanvas, xScrollCmd), TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_PIXELS, "-xscrollincrement", "xScrollIncrement", "ScrollIncrement", DEF_CANVAS_X_SCROLL_INCREMENT, Tk_Offset(TkCanvas, xScrollIncrement), 0, NULL}, {TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand", DEF_CANVAS_Y_SCROLL_CMD, Tk_Offset(TkCanvas, yScrollCmd), TK_CONFIG_NULL_OK, NULL}, {TK_CONFIG_PIXELS, "-yscrollincrement", "yScrollIncrement", "ScrollIncrement", DEF_CANVAS_Y_SCROLL_INCREMENT, Tk_Offset(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) #ifndef USE_OLD_TAG_SEARCH /* * 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); #endif /* USE_OLD_TAG_SEARCH */ /* * 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 DestroyCanvas(char *memPtr); static void DisplayCanvas(ClientData clientData); static void DoItem(Tcl_Interp *interp, Tk_Item *itemPtr, Tk_Uid tag); static void EventuallyRedrawItem(TkCanvas *canvasPtr, Tk_Item *itemPtr); #ifdef USE_OLD_TAG_SEARCH static int FindItems(Tcl_Interp *interp, TkCanvas *canvasPtr, int argc, Tcl_Obj *const *argv, Tcl_Obj *newTagObj, int first); #else /* USE_OLD_TAG_SEARCH */ static int FindItems(Tcl_Interp *interp, TkCanvas *canvasPtr, int argc, Tcl_Obj *const *argv, Tcl_Obj *newTagObj, int first, TagSearch **searchPtrPtr); #endif /* USE_OLD_TAG_SEARCH */ 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); #ifdef USE_OLD_TAG_SEARCH static Tk_Item * NextItem(TagSearch *searchPtr); #endif /* USE_OLD_TAG_SEARCH */ static void PickCurrentItem(TkCanvas *canvasPtr, XEvent *eventPtr); static Tcl_Obj * ScrollFractions(int screen1, int screen2, int object1, int object2); #ifdef USE_OLD_TAG_SEARCH static void RelinkItems(TkCanvas *canvasPtr, Tcl_Obj *tag, Tk_Item *prevPtr); static Tk_Item * StartTagSearch(TkCanvas *canvasPtr, Tcl_Obj *tag, TagSearch *searchPtr); #else /* USE_OLD_TAG_SEARCH */ 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); #endif /* USE_OLD_TAG_SEARCH */ /* * 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. */ #ifdef USE_OLD_TAG_SEARCH #define FIRST_CANVAS_ITEM_MATCHING(objPtr,searchPtrPtr,errorExitClause) \ (itemPtr) = StartTagSearch(canvasPtr,(objPtr),&search) #define FOR_EVERY_CANVAS_ITEM_MATCHING(objPtr,searchPtrPtr,errorExitClause) \ for ((itemPtr) = StartTagSearch(canvasPtr, (objPtr), &search); \ (itemPtr) != NULL; (itemPtr) = NextItem(&search)) #define FIND_ITEMS(objPtr, n) \ FindItems(interp, canvasPtr, objc, objv, (objPtr), (n)) #define RELINK_ITEMS(objPtr, itemPtr) \ RelinkItems(canvasPtr, (objPtr), (itemPtr)) #else /* USE_OLD_TAG_SEARCH */ #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) #endif /* USE_OLD_TAG_SEARCH */ /* * ---------------------------------------------------------------------- * * 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((char *) 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((char *) 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((char *) 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); } /* *-------------------------------------------------------------- * * 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 = (TkCanvas *) 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 = None; 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 = (Tcl_TimerToken) 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 = None; 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; #ifndef USE_OLD_TAG_SEARCH canvasPtr->bindTagExprs = NULL; #endif 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. */ #ifdef USE_OLD_TAG_SEARCH TagSearch search; #else /* USE_OLD_TAG_SEARCH */ TagSearch *searchPtr = NULL;/* Allocated by first TagSearchScan, freed by * TagSearchDestroy */ #endif /* USE_OLD_TAG_SEARCH */ int index; static const char *const optionStrings[] = { "addtag", "bbox", "bind", "canvasx", "canvasy", "cget", "configure", "coords", "create", "dchars", "delete", "dtag", "find", "focus", "gettags", "icursor", "imove", "index", "insert", "itemcget", "itemconfigure", "lower", "move", "moveto", "postscript", "raise", "rchars", "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_IMOVE, CANV_INDEX, CANV_INSERT, CANV_ITEMCGET, CANV_ITEMCONFIGURE, CANV_LOWER, CANV_MOVE, CANV_MOVETO, CANV_POSTSCRIPT, CANV_RAISE, CANV_RCHARS, 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_NewIntObj(x1); resultObjs[1] = Tcl_NewIntObj(y1); resultObjs[2] = Tcl_NewIntObj(x2); resultObjs[3] = Tcl_NewIntObj(y2); Tcl_SetObjResult(interp, Tcl_NewListObj(4, resultObjs)); } break; } case CANV_BIND: { ClientData 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; #ifdef USE_OLD_TAG_SEARCH if (isdigit(UCHAR(Tcl_GetString(objv[2])[0]))) { int id; char *end; Tcl_HashEntry *entryPtr; id = strtoul(Tcl_GetString(objv[2]), &end, 0); if (*end != 0) { goto bindByTag; } entryPtr = Tcl_FindHashEntry(&canvasPtr->idTable, (char *) id); if (entryPtr != NULL) { itemPtr = Tcl_GetHashValue(entryPtr); object = itemPtr; } if (object == NULL) { Tcl_AppendResult(interp, "item \"", Tcl_GetString(objv[2]), "\" doesn't exist", NULL); result = TCL_ERROR; goto done; } } else { bindByTag: object = Tk_GetUid(Tcl_GetString(objv[2])); } #else /* USE_OLD_TAG_SEARCH */ 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, (char *) INT2PTR(searchPtr->id)); if (entryPtr != NULL) { itemPtr = Tcl_GetHashValue(entryPtr); object = itemPtr; } if (object == 0) { Tcl_AppendResult(interp, "item \"", Tcl_GetString(objv[2]), "\" doesn't exist", NULL); result = TCL_ERROR; goto done; } } else { object = (ClientData) searchPtr->expr->uid; } #endif /* USE_OLD_TAG_SEARCH */ /* * 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; } #ifndef USE_OLD_TAG_SEARCH 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; } } #endif /* not USE_OLD_TAG_SEARCH */ 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) ~(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_ResetResult(interp); Tcl_AppendResult(interp, "requested illegal events; ", "only key, button, motion, enter, leave, and virtual", " events may be used", 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_GetStringResult(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; int length; if (objc < 3) { Tcl_WrongNumArgs(interp, 2, objv, "type coords ?arg ...?"); result = TCL_ERROR; goto done; } arg = Tcl_GetStringFromObj(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, (unsigned)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_AppendResult(interp, "unknown or ambiguous 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 = (Tk_Item *) ckalloc((unsigned) 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((char *) itemPtr); result = TCL_ERROR; goto done; } itemPtr->nextPtr = NULL; entryPtr = Tcl_CreateHashEntry(&canvasPtr->idTable, (char *) 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_NewIntObj(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 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); 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((char *) itemPtr->tagPtr); } entryPtr = Tcl_FindHashEntry(&canvasPtr->idTable, (char *) 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((char *) 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_NewIntObj(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; for (i = 0; i < itemPtr->numTags; i++) { Tcl_AppendElement(interp, (char *) itemPtr->tagPtr[i]); } } 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_AppendResult(interp, "can't find an indexable item \"", Tcl_GetString(objv[2]), "\"", NULL); result = TCL_ERROR; goto done; } result = ItemIndex(canvasPtr, itemPtr, objv[3], &index); if (result != TCL_OK) { goto done; } Tcl_SetObjResult(interp, Tcl_NewIntObj(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_AppendResult(interp, "tag \"", Tcl_GetString(objv[3]), "\" doesn't match any items", NULL); 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((char *) 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_AppendResult(interp, "tagOrId \"", Tcl_GetString(objv[3]), "\" doesn't match any items", NULL); result = TCL_ERROR; goto done; } } RELINK_ITEMS(objv[2], prevPtr); break; } case CANV_RCHARS: { int first, last; int x1,x2,y1,y2; 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); ItemInsert(canvasPtr, itemPtr, first, objv[5]); 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_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_SetResult(interp, "scale factor cannot be zero", TCL_STATIC); 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_AppendResult(interp, "can't find an indexable and selectable item \"", Tcl_GetString(objv[3]), "\"", 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_NewIntObj(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; if (objc == 2) { Tcl_SetObjResult(interp, ScrollFractions( canvasPtr->xOrigin + canvasPtr->inset, canvasPtr->xOrigin + Tk_Width(canvasPtr->tkwin) - canvasPtr->inset, canvasPtr->scrollX1, canvasPtr->scrollX2)); } else { const char **args = TkGetStringsFromObjs(objc, objv); type = Tk_GetScrollInfo(interp, objc, args, &fraction, &count); if (args != NULL) { ckfree((char *) 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; if (objc == 2) { Tcl_SetObjResult(interp, ScrollFractions( canvasPtr->yOrigin + canvasPtr->inset, canvasPtr->yOrigin + Tk_Height(canvasPtr->tkwin) - canvasPtr->inset, canvasPtr->scrollY1, canvasPtr->scrollY2)); } else { const char **args = TkGetStringsFromObjs(objc, objv); type = Tk_GetScrollInfo(interp, objc, args, &fraction, &count); if (args != NULL) { ckfree((char *) 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; } } done: #ifndef USE_OLD_TAG_SEARCH TagSearchDestroy(searchPtr); #endif /* not USE_OLD_TAG_SEARCH */ 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( char *memPtr) /* Info about canvas widget. */ { TkCanvas *canvasPtr = (TkCanvas *) memPtr; Tk_Item *itemPtr; #ifndef USE_OLD_TAG_SEARCH TagSearchExpr *expr, *next; #endif /* * 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((char *) itemPtr->tagPtr); } ckfree((char *) 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 != None) { Tk_FreeGC(canvasPtr->display, canvasPtr->pixmapGC); } #ifndef USE_OLD_TAG_SEARCH expr = canvasPtr->bindTagExprs; while (expr) { next = expr->next; TagSearchExprDestroy(expr); expr = next; } #endif /* USE_OLD_TAG_SEARCH */ Tcl_DeleteTimerHandler(canvasPtr->insertBlinkHandler); if (canvasPtr->bindingTable != NULL) { Tk_DeleteBindingTable(canvasPtr->bindingTable); } Tk_FreeOptions(configSpecs, (char *) canvasPtr, canvasPtr->display, 0); canvasPtr->tkwin = NULL; ckfree((char *) 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 != None) { 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_AppendResult(interp, "bad scrollRegion \"", canvasPtr->regionString, "\"", NULL); badRegion: ckfree(canvasPtr->regionString); ckfree((char *) 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((char *) 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)); } /* *---------------------------------------------------------------------- * * 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; } /* * 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) { 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); } #ifdef USE_OLD_TAG_SEARCH /* *-------------------------------------------------------------- * * StartTagSearch -- * * This function is called to initiate an enumeration of all items in a * given canvas that contain a given tag. * * Results: * The return value is a pointer to the first item in canvasPtr that * matches tag, or NULL if there is no such item. The information at * *searchPtr is initialized such that successive calls to NextItem will * return successive 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. EndTagSearch must be called at the end of the search to * unlink searchPtr from this list. * *-------------------------------------------------------------- */ static Tk_Item * StartTagSearch( TkCanvas *canvasPtr, /* Canvas whose items are to be searched. */ Tcl_Obj *tagObj, /* Object giving tag value. */ TagSearch *searchPtr) /* Record describing tag search; will be * initialized here. */ { int id; Tk_Item *itemPtr, *lastPtr; Tk_Uid *tagPtr; Tk_Uid uid; char *tag = Tcl_GetString(tagObj); int count; TkWindow *tkwin = (TkWindow *) canvasPtr->tkwin; TkDisplay *dispPtr = tkwin->dispPtr; /* * Initialize the search. */ searchPtr->canvasPtr = canvasPtr; searchPtr->searchOver = 0; /* * 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 (isdigit(UCHAR(*tag))) { char *end; Tcl_HashEntry *entryPtr; dispPtr->numIdSearches++; id = strtoul(tag, &end, 0); if (*end == 0) { itemPtr = canvasPtr->hotPtr; lastPtr = canvasPtr->hotPrevPtr; if ((itemPtr == NULL) || (itemPtr->id != id) || (lastPtr == NULL) || (lastPtr->nextPtr != itemPtr)) { dispPtr->numSlowSearches++; entryPtr = Tcl_FindHashEntry(&canvasPtr->idTable, (char*) id); if (entryPtr != NULL) { itemPtr = Tcl_GetHashValue(entryPtr); lastPtr = itemPtr->prevPtr; } else { lastPtr = itemPtr = NULL; } } searchPtr->lastPtr = lastPtr; searchPtr->searchOver = 1; canvasPtr->hotPtr = itemPtr; canvasPtr->hotPrevPtr = lastPtr; return itemPtr; } } searchPtr->tag = uid = Tk_GetUid(tag); if (uid == Tk_GetUid("all")) { /* * All items match. */ searchPtr->tag = NULL; searchPtr->lastPtr = NULL; searchPtr->currentPtr = canvasPtr->firstItemPtr; return canvasPtr->firstItemPtr; } /* * None of the above. Search for an item with a matching tag. */ for (lastPtr = NULL, itemPtr = 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; } } } searchPtr->lastPtr = lastPtr; searchPtr->searchOver = 1; return NULL; } /* *-------------------------------------------------------------- * * NextItem -- * * This function returns successive items that match a given tag; it * should be called only after StartTagSearch has been used to begin a * search. * * Results: * The return value is a pointer to the next item that matches the tag * specified to StartTagSearch, 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 * NextItem( TagSearch *searchPtr) /* Record describing search in progress. */ { Tk_Item *itemPtr, *lastPtr; int count; Tk_Uid uid; Tk_Uid *tagPtr; /* * 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; } /* * Handle special case of "all" search by returning next item. */ uid = searchPtr->tag; if (uid == NULL) { searchPtr->lastPtr = lastPtr; searchPtr->currentPtr = itemPtr; return itemPtr; } /* * Look for an item with a particular tag. */ 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 /* !USE_OLD_TAG_SEARCH */ /* *---------------------------------------------------------------------- * * 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 = (TagSearchExpr *) 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((char *) expr->uids); } ckfree((char *) 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 = (TagSearch *) 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((char *) searchPtr->rewritebuffer); ckfree((char *) 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++]; if (expr->allocated == expr->index) { expr->allocated += 15; if (expr->uids) { expr->uids = (Tk_Uid *) ckrealloc((char *) expr->uids, expr->allocated * sizeof(Tk_Uid)); } else { expr->uids = (Tk_Uid *) 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_AppendResult(interp, "Too many '!' in tag search expression", 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_AppendResult(interp, "Missing endquote in tag search expression", NULL); return TCL_ERROR; } if (!(tag - searchPtr->rewritebuffer)) { Tcl_AppendResult(interp, "Null quoted tag string in tag search expression", 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_AppendResult(interp, "Unexpected operator in tag search expression", 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_AppendResult(interp, "Singleton '&' in tag search expression", 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_AppendResult(interp, "Singleton '|' in tag search expression", 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_AppendResult(interp, "Invalid boolean operator in tag search expression", NULL); return TCL_ERROR; } } } breakwhile: if (found_tag && !looking_for_tag) { return TCL_OK; } Tcl_AppendResult(interp, "Missing tag in tag search expression", 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, (char *) 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; } #endif /* USE_OLD_TAG_SEARCH */ /* *-------------------------------------------------------------- * * DoItem -- * * This is a utility function called by FindItems. It either adds * itemPtr's id to the result forming in interp, 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 a list element to the * interp's result; otherwise tag is added to itemPtr's list of tags. * *-------------------------------------------------------------- */ static void DoItem( Tcl_Interp *interp, /* Interpreter 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) { char msg[TCL_INTEGER_SPACE]; sprintf(msg, "%d", itemPtr->id); Tcl_AppendElement(interp, msg); 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 = (Tk_Uid *) ckalloc((unsigned) itemPtr->tagSpace * sizeof(Tk_Uid)); memcpy((void *) newTagPtr, itemPtr->tagPtr, itemPtr->numTags * sizeof(Tk_Uid)); if (itemPtr->tagPtr != itemPtr->staticTagSpace) { ckfree((char *) 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. */ #ifndef USE_OLD_TAG_SEARCH ,TagSearch **searchPtrPtr /* From CanvasWidgetCmd local vars*/ #endif /* not USE_OLD_TAG_SEARCH */ ) { #ifdef USE_OLD_TAG_SEARCH TagSearch search; #endif /* USE_OLD_TAG_SEARCH */ Tk_Item *itemPtr; Tk_Uid uid; int index, result; 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)) { DoItem(interp, lastPtr->nextPtr, uid); } break; } case CANV_ALL: if (objc != first+1) { Tcl_WrongNumArgs(interp, first+1, objv, NULL); return TCL_ERROR; } for (itemPtr = canvasPtr->firstItemPtr; itemPtr != NULL; itemPtr = itemPtr->nextPtr) { DoItem(interp, itemPtr, uid); } 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) { if (itemPtr->prevPtr != NULL) { DoItem(interp, itemPtr->prevPtr, uid); } } 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_AppendResult(interp, "can't have negative halo value \"", Tcl_GetString(objv[3]), "\"", NULL); 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) { DoItem(interp, closestPtr, uid); 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; } FOR_EVERY_CANVAS_ITEM_MATCHING(objv[first+1], searchPtrPtr, return TCL_ERROR) { DoItem(interp, itemPtr, uid); } } 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; 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); 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(interp, itemPtr, uid); } } 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. * *-------------------------------------------------------------- */ #ifdef USE_OLD_TAG_SEARCH static void 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). */ #else /* USE_OLD_TAG_SEARCH */ 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 */ #endif /* USE_OLD_TAG_SEARCH */ { Tk_Item *itemPtr; #ifdef USE_OLD_TAG_SEARCH TagSearch search; #endif /* USE_OLD_TAG_SEARCH */ 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) { #ifdef USE_OLD_TAG_SEARCH return; #else /* USE_OLD_TAG_SEARCH */ return TCL_OK; #endif /* USE_OLD_TAG_SEARCH */ } 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; } #ifndef USE_OLD_TAG_SEARCH return TCL_OK; #endif /* not USE_OLD_TAG_SEARCH */ } /* *-------------------------------------------------------------- * * 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; int 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: switch (eventPtr->xbutton.button) { case Button1: mask = Button1Mask; break; case Button2: mask = Button2Mask; break; case Button3: mask = Button3Mask; break; case Button4: mask = Button4Mask; break; case Button5: mask = Button5Mask; break; default: mask = 0; break; } /* * 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]; int buttonDown; Tk_Item *prevItemPtr; #ifndef USE_OLD_TAG_SEARCH SearchUids *searchUids = GetStaticUids(); #endif /* * 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 & (Button1Mask|Button2Mask|Button3Mask|Button4Mask|Button5Mask); /* * 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 that deletes the current item. */ if ((itemPtr == canvasPtr->currentItemPtr) && !buttonDown) { for (i = itemPtr->numTags-1; i >= 0; i--) { #ifdef USE_OLD_TAG_SEARCH if (itemPtr->tagPtr[i] == Tk_GetUid("current")) #else /* USE_OLD_TAG_SEARCH */ if (itemPtr->tagPtr[i] == searchUids->currentUid) #endif /* USE_OLD_TAG_SEARCH */ /* 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; #ifdef USE_OLD_TAG_SEARCH DoItem(NULL, canvasPtr->currentItemPtr, Tk_GetUid("current")); #else /* USE_OLD_TAG_SEARCH */ DoItem(NULL, canvasPtr->currentItemPtr, searchUids->currentUid); #endif /* USE_OLD_TAG_SEARCH */ 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 ClientData staticObjects[NUM_STATIC]; ClientData *objectPtr; int numObjects, i; Tk_Item *itemPtr; #ifndef USE_OLD_TAG_SEARCH TagSearchExpr *expr; int numExprs; SearchUids *searchUids = GetStaticUids(); #endif /* not USE_OLD_TAG_SEARCH */ if (canvasPtr->bindingTable == NULL) { return; } itemPtr = canvasPtr->currentItemPtr; if ((eventPtr->type == KeyPress) || (eventPtr->type == KeyRelease)) { itemPtr = canvasPtr->textInfo.focusItemPtr; } if (itemPtr == NULL) { return; } #ifdef USE_OLD_TAG_SEARCH /* * 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, and (c) the tag "all". If there are a * lot of tags then malloc an array to hold all of the objects. */ numObjects = itemPtr->numTags + 2; #else /* USE_OLD_TAG_SEARCH */ /* * 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; #endif /* not USE_OLD_TAG_SEARCH */ if (numObjects <= NUM_STATIC) { objectPtr = staticObjects; } else { objectPtr = (ClientData *) ckalloc((unsigned) numObjects * sizeof(ClientData)); } #ifdef USE_OLD_TAG_SEARCH objectPtr[0] = (ClientData) Tk_GetUid("all"); #else /* USE_OLD_TAG_SEARCH */ objectPtr[0] = (ClientData) searchUids->allUid; #endif /* USE_OLD_TAG_SEARCH */ for (i = itemPtr->numTags-1; i >= 0; i--) { objectPtr[i+1] = (ClientData) itemPtr->tagPtr[i]; } objectPtr[itemPtr->numTags+1] = itemPtr; #ifndef USE_OLD_TAG_SEARCH /* * 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; } #endif /* not USE_OLD_TAG_SEARCH */ /* * 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((char *) 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 = (Tcl_TimerToken) 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; /* * 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); result = Tcl_VarEval(interp, xScrollCmd," ",Tcl_GetString(fractions), NULL); 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); result = Tcl_VarEval(interp, yScrollCmd," ",Tcl_GetString(fractions), NULL); 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 = (const char **) 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: */