/* * tkTextTag.c -- * * This module implements the "tag" subcommand of the widget command * for text widgets, plus most of the other high-level functions * related to tags. * * Copyright 1992 Regents of the University of California. * Permission to use, copy, modify, and distribute this * software and its documentation for any purpose and without * fee is hereby granted, provided that the above copyright * notice appear in all copies. The University of California * makes no representations about the suitability of this * software for any purpose. It is provided "as is" without * express or implied warranty. */ #ifndef lint static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkTextTag.c,v 1.5 92/12/16 09:59:41 ouster Exp $ SPRITE (Berkeley)"; #endif #include "default.h" #include "tkConfig.h" #include "tk.h" #include "tkText.h" /* * Information used for parsing tag configuration information: */ static Tk_ConfigSpec tagConfigSpecs[] = { {TK_CONFIG_BORDER, "-background", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TkTextTag, border), TK_CONFIG_NULL_OK}, {TK_CONFIG_BITMAP, "-bgstipple", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TkTextTag, bgStipple), TK_CONFIG_NULL_OK}, {TK_CONFIG_PIXELS, "-borderwidth", (char *) NULL, (char *) NULL, "0", Tk_Offset(TkTextTag, borderWidth), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_BITMAP, "-fgstipple", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TkTextTag, fgStipple), TK_CONFIG_NULL_OK}, {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TkTextTag, fontPtr), TK_CONFIG_NULL_OK}, {TK_CONFIG_COLOR, "-foreground", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TkTextTag, fgColor), TK_CONFIG_NULL_OK}, {TK_CONFIG_RELIEF, "-relief", (char *) NULL, (char *) NULL, "flat", Tk_Offset(TkTextTag, relief), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_BOOLEAN, "-underline", (char *) NULL, (char *) NULL, "0", Tk_Offset(TkTextTag, underline), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, 0} }; /* * The following definition specifies the maximum number of characters * needed in a string to hold a position specifier. */ #define POS_CHARS 30 /* * Forward declarations for procedures defined later in this file: */ static void ChangeTagPriority _ANSI_ARGS_((TkText *textPtr, TkTextTag *tagPtr, int prio)); static TkTextTag * FindTag _ANSI_ARGS_((Tcl_Interp *interp, TkText *textPtr, char *tagName)); static void SortTags _ANSI_ARGS_((int numTags, TkTextTag **tagArrayPtr)); static int TagSortProc _ANSI_ARGS_((CONST VOID *first, CONST VOID *second)); static void TextDoEvent _ANSI_ARGS_((TkText *textPtr, XEvent *eventPtr)); /* *-------------------------------------------------------------- * * TkTextTagCmd -- * * This procedure is invoked to process the "tag" options of * the widget command for text widgets. See the user documentation * for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *-------------------------------------------------------------- */ int TkTextTagCmd(textPtr, interp, argc, argv) register TkText *textPtr; /* Information about text widget. */ Tcl_Interp *interp; /* Current interpreter. */ int argc; /* Number of arguments. */ char **argv; /* Argument strings. Someone else has already * parsed this command enough to know that * argv[1] is "tag". */ { int length, line1, ch1, line2, ch2, i, addTag; char c; char *fullOption; register TkTextTag *tagPtr; if (argc < 3) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag option ?arg arg ...?\"", (char *) NULL); return TCL_ERROR; } c = argv[2][0]; length = strlen(argv[2]); if ((c == 'a') && (strncmp(argv[2], "add", length) == 0)) { fullOption = "add"; addTag = 1; addAndRemove: if ((argc != 5) && (argc != 6)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag ", fullOption, " tagName index1 ?index2?\"", (char *) NULL); return TCL_ERROR; } tagPtr = TkTextCreateTag(textPtr, argv[3]); if (TkTextGetIndex(interp, textPtr, argv[4], &line1, &ch1) != TCL_OK) { return TCL_ERROR; } if (argc == 6) { if (TkTextGetIndex(interp, textPtr, argv[5], &line2, &ch2) != TCL_OK) { return TCL_ERROR; } } else { line2 = line1; ch2 = ch1+1; } if (TK_TAG_AFFECTS_DISPLAY(tagPtr)) { TkTextRedrawTag(textPtr, line1, ch1, line2, ch2, tagPtr, !addTag); } TkBTreeTag(textPtr->tree, line1, ch1, line2, ch2, tagPtr, addTag); /* * If the tag is "sel" then grab the selection if we're supposed * to export it and don't already have it. Also, invalidate * partially-completed selection retrievals. */ if (tagPtr == textPtr->selTagPtr) { if (addTag && textPtr->exportSelection && !(textPtr->flags & GOT_SELECTION)) { Tk_OwnSelection(textPtr->tkwin, TkTextLostSelection, (ClientData) textPtr); textPtr->flags |= GOT_SELECTION; } textPtr->selOffset = -1; } } else if ((c == 'b') && (strncmp(argv[2], "bind", length) == 0)) { if ((argc < 4) || (argc > 6)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag bind tagName ?sequence? ?command?\"", (char *) NULL); return TCL_ERROR; } tagPtr = TkTextCreateTag(textPtr, argv[3]); /* * Make a binding table if the widget doesn't already have * one. */ if (textPtr->bindingTable == NULL) { textPtr->bindingTable = Tk_CreateBindingTable(interp); } if (argc == 6) { int append = 0; unsigned long mask; if (argv[5][0] == 0) { return Tk_DeleteBinding(interp, textPtr->bindingTable, (ClientData) tagPtr, argv[4]); } if (argv[5][0] == '+') { argv[5]++; append = 1; } mask = Tk_CreateBinding(interp, textPtr->bindingTable, (ClientData) tagPtr, argv[4], argv[5], append); if (mask == 0) { return TCL_ERROR; } if (mask & ~(ButtonMotionMask|Button1MotionMask|Button2MotionMask |Button3MotionMask|Button4MotionMask|Button5MotionMask |ButtonPressMask|ButtonReleaseMask|EnterWindowMask |LeaveWindowMask|KeyPressMask|KeyReleaseMask |PointerMotionMask)) { Tk_DeleteBinding(interp, textPtr->bindingTable, (ClientData) tagPtr, argv[4]); Tcl_ResetResult(interp); Tcl_AppendResult(interp, "requested illegal events; ", "only key, button, motion, and enter/leave ", "events may be used", (char *) NULL); return TCL_ERROR; } } else if (argc == 5) { char *command; command = Tk_GetBinding(interp, textPtr->bindingTable, (ClientData) tagPtr, argv[4]); if (command == NULL) { return TCL_ERROR; } interp->result = command; } else { Tk_GetAllBindings(interp, textPtr->bindingTable, (ClientData) tagPtr); } } else if ((c == 'c') && (strncmp(argv[2], "configure", length) == 0)) { if (argc < 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag configure tagName ?option? ?value? ", "?option value ...?\"", (char *) NULL); return TCL_ERROR; } tagPtr = TkTextCreateTag(textPtr, argv[3]); if (argc == 4) { return Tk_ConfigureInfo(interp, textPtr->tkwin, tagConfigSpecs, (char *) tagPtr, (char *) NULL, 0); } else if (argc == 5) { return Tk_ConfigureInfo(interp, textPtr->tkwin, tagConfigSpecs, (char *) tagPtr, argv[4], 0); } else { int result; result = Tk_ConfigureWidget(interp, textPtr->tkwin, tagConfigSpecs, argc-4, argv+4, (char *) tagPtr, 0); /* * If the "sel" tag was changed, be sure to mirror information * from the tag back into the text widget record. NOTE: we * don't have to free up information in the widget record * before overwriting it, because it was mirrored in the tag * and hence freed when the tag field was overwritten. */ if (tagPtr == textPtr->selTagPtr) { textPtr->selBorder = tagPtr->border; textPtr->selBorderWidth = tagPtr->borderWidth; textPtr->selFgColorPtr = tagPtr->fgColor; } TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree), 0, tagPtr, 1); return result; } } else if ((c == 'd') && (strncmp(argv[2], "delete", length) == 0)) { Tcl_HashEntry *hPtr; if (argc < 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag delete tagName tagName ...\"", (char *) NULL); return TCL_ERROR; } for (i = 3; i < argc; i++) { hPtr = Tcl_FindHashEntry(&textPtr->tagTable, argv[i]); if (hPtr == NULL) { continue; } tagPtr = (TkTextTag *) Tcl_GetHashValue(hPtr); if (tagPtr == textPtr->selTagPtr) { interp->result = "can't delete selection tag"; return TCL_ERROR; } if (TK_TAG_AFFECTS_DISPLAY(tagPtr)) { TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree), 0, tagPtr, 1); } TkBTreeTag(textPtr->tree, 0, 0, TkBTreeNumLines(textPtr->tree), 0, tagPtr, 0); Tcl_DeleteHashEntry(hPtr); if (textPtr->bindingTable != NULL) { Tk_DeleteAllBindings(textPtr->bindingTable, (ClientData) tagPtr); } /* * Update the tag priorities to reflect the deletion of this tag. */ ChangeTagPriority(textPtr, tagPtr, textPtr->numTags-1); textPtr->numTags -= 1; TkTextFreeTag(textPtr, tagPtr); } } else if ((c == 'l') && (strncmp(argv[2], "lower", length) == 0)) { TkTextTag *tagPtr2; int prio; if ((argc != 4) && (argc != 5)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag lower tagName ?belowThis?\"", (char *) NULL); return TCL_ERROR; } tagPtr = FindTag(interp, textPtr, argv[3]); if (tagPtr == NULL) { return TCL_ERROR; } if (argc == 5) { tagPtr2 = FindTag(interp, textPtr, argv[4]); if (tagPtr2 == NULL) { return TCL_ERROR; } if (tagPtr->priority < tagPtr2->priority) { prio = tagPtr2->priority - 1; } else { prio = tagPtr2->priority; } } else { prio = 0; } ChangeTagPriority(textPtr, tagPtr, prio); TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree), 0, tagPtr, 1); } else if ((c == 'n') && (strncmp(argv[2], "names", length) == 0) && (length >= 2)) { TkTextTag **arrayPtr; int arraySize; TkTextLine *linePtr; if ((argc != 3) && (argc != 4)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag names ?index?\"", (char *) NULL); return TCL_ERROR; } if (argc == 3) { Tcl_HashSearch search; Tcl_HashEntry *hPtr; arrayPtr = (TkTextTag **) ckalloc((unsigned) (textPtr->numTags * sizeof(TkTextTag *))); for (i = 0, hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search); hPtr != NULL; i++, hPtr = Tcl_NextHashEntry(&search)) { arrayPtr[i] = (TkTextTag *) Tcl_GetHashValue(hPtr); } arraySize = textPtr->numTags; } else { if (TkTextGetIndex(interp, textPtr, argv[3], &line1, &ch1) != TCL_OK) { return TCL_ERROR; } linePtr = TkBTreeFindLine(textPtr->tree, line1); if (linePtr == NULL) { return TCL_OK; } arrayPtr = TkBTreeGetTags(textPtr->tree, linePtr, ch1, &arraySize); if (arrayPtr == NULL) { return TCL_OK; } } SortTags(arraySize, arrayPtr); for (i = 0; i < arraySize; i++) { tagPtr = arrayPtr[i]; Tcl_AppendElement(interp, tagPtr->name, 0); } ckfree((char *) arrayPtr); } else if ((c == 'n') && (strncmp(argv[2], "nextrange", length) == 0) && (length >= 2)) { TkTextSearch tSearch; char position[POS_CHARS]; if ((argc != 5) && (argc != 6)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag nextrange tagName index1 ?index2?\"", (char *) NULL); return TCL_ERROR; } tagPtr = FindTag((Tcl_Interp *) NULL, textPtr, argv[3]); if (tagPtr == NULL) { return TCL_OK; } if (TkTextGetIndex(interp, textPtr, argv[4], &line1, &ch1) != TCL_OK) { return TCL_ERROR; } if (argc == 5) { line2 = TkBTreeNumLines(textPtr->tree); ch2 = 0; } else if (TkTextGetIndex(interp, textPtr, argv[5], &line2, &ch2) != TCL_OK) { return TCL_ERROR; } /* * The search below is a bit tricky. Rather than use the B-tree * facilities to stop the search at line2.ch2, let it search up * until the end of the file but check for a position past line2.ch2 * ourselves. The reason for doing it this way is that we only * care whether the *start* of the range is before line2.ch2; once * we find the start, we don't want TkBTreeNextTag to abort the * search because the end of the range is after line2.ch2. */ TkBTreeStartSearch(textPtr->tree, line1, ch1, TkBTreeNumLines(textPtr->tree), 0, tagPtr, &tSearch); if (!TkBTreeNextTag(&tSearch)) { return TCL_OK; } if (!TkBTreeCharTagged(tSearch.linePtr, tSearch.ch1, tagPtr)) { if (!TkBTreeNextTag(&tSearch)) { return TCL_OK; } } if ((tSearch.line1 > line2) || ((tSearch.line1 == line2) && (tSearch.ch1 >= ch2))) { return TCL_OK; } TkTextPrintIndex(tSearch.line1, tSearch.ch1, position); Tcl_AppendElement(interp, position, 0); TkBTreeNextTag(&tSearch); TkTextPrintIndex(tSearch.line1, tSearch.ch1, position); Tcl_AppendElement(interp, position, 0); } else if ((c == 'r') && (strncmp(argv[2], "raise", length) == 0) && (length >= 3)) { TkTextTag *tagPtr2; int prio; if ((argc != 4) && (argc != 5)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag raise tagName ?aboveThis?\"", (char *) NULL); return TCL_ERROR; } tagPtr = FindTag(interp, textPtr, argv[3]); if (tagPtr == NULL) { return TCL_ERROR; } if (argc == 5) { tagPtr2 = FindTag(interp, textPtr, argv[4]); if (tagPtr2 == NULL) { return TCL_ERROR; } if (tagPtr->priority <= tagPtr2->priority) { prio = tagPtr2->priority; } else { prio = tagPtr2->priority + 1; } } else { prio = textPtr->numTags-1; } ChangeTagPriority(textPtr, tagPtr, prio); TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree), 0, tagPtr, 1); } else if ((c == 'r') && (strncmp(argv[2], "ranges", length) == 0) && (length >= 3)) { TkTextSearch tSearch; char position[POS_CHARS]; if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " tag ranges tagName\"", (char *) NULL); return TCL_ERROR; } tagPtr = FindTag((Tcl_Interp *) NULL, textPtr, argv[3]); if (tagPtr == NULL) { return TCL_OK; } TkBTreeStartSearch(textPtr->tree, 0, 0, TkBTreeNumLines(textPtr->tree), 0, tagPtr, &tSearch); while (TkBTreeNextTag(&tSearch)) { TkTextPrintIndex(tSearch.line1, tSearch.ch1, position); Tcl_AppendElement(interp, position, 0); } } else if ((c == 'r') && (strncmp(argv[2], "remove", length) == 0) && (length >= 2)) { fullOption = "remove"; addTag = 0; goto addAndRemove; } else { Tcl_AppendResult(interp, "bad tag option \"", argv[2], "\": must be add, bind, configure, delete, lower, ", "names, nextrange, raise, ranges, or remove", (char *) NULL); return TCL_ERROR; } return TCL_OK; } /* *---------------------------------------------------------------------- * * TkTextCreateTag -- * * Find the record describing a tag within a given text widget, * creating a new record if one doesn't already exist. * * Results: * The return value is a pointer to the TkTextTag record for tagName. * * Side effects: * A new tag record is created if there isn't one already defined * for tagName. * *---------------------------------------------------------------------- */ TkTextTag * TkTextCreateTag(textPtr, tagName) TkText *textPtr; /* Widget in which tag is being used. */ char *tagName; /* Name of desired tag. */ { register TkTextTag *tagPtr; Tcl_HashEntry *hPtr; int new; hPtr = Tcl_CreateHashEntry(&textPtr->tagTable, tagName, &new); if (!new) { return (TkTextTag *) Tcl_GetHashValue(hPtr); } /* * No existing entry. Create a new one, initialize it, and add a * pointer to it to the hash table entry. */ tagPtr = (TkTextTag *) ckalloc(sizeof(TkTextTag)); tagPtr->name = Tcl_GetHashKey(&textPtr->tagTable, hPtr); tagPtr->priority = textPtr->numTags; tagPtr->border = NULL; tagPtr->borderWidth = 1; tagPtr->relief = TK_RELIEF_FLAT; tagPtr->bgStipple = None; tagPtr->fgColor = NULL; tagPtr->fontPtr = NULL; tagPtr->fgStipple = None; tagPtr->underline = 0; textPtr->numTags++; Tcl_SetHashValue(hPtr, tagPtr); return tagPtr; } /* *---------------------------------------------------------------------- * * FindTag -- * * See if tag is defined for a given widget. * * Results: * If tagName is defined in textPtr, a pointer to its TkTextTag * structure is returned. Otherwise NULL is returned and an * error message is recorded in interp->result unless interp * is NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ static TkTextTag * FindTag(interp, textPtr, tagName) Tcl_Interp *interp; /* Interpreter to use for error message; * if NULL, then don't record an error * message. */ TkText *textPtr; /* Widget in which tag is being used. */ char *tagName; /* Name of desired tag. */ { Tcl_HashEntry *hPtr; hPtr = Tcl_FindHashEntry(&textPtr->tagTable, tagName); if (hPtr != NULL) { return (TkTextTag *) Tcl_GetHashValue(hPtr); } if (interp != NULL) { Tcl_AppendResult(interp, "tag \"", tagName, "\" isn't defined in text widget", (char *) NULL); } return NULL; } /* *---------------------------------------------------------------------- * * TkTextFreeTag -- * * This procedure is called when a tag is deleted to free up the * memory and other resources associated with the tag. * * Results: * None. * * Side effects: * Memory and other resources are freed. * *---------------------------------------------------------------------- */ void TkTextFreeTag(textPtr, tagPtr) TkText *textPtr; /* Info about overall widget. */ register TkTextTag *tagPtr; /* Tag being deleted. */ { if (tagPtr->border != None) { Tk_Free3DBorder(tagPtr->border); } if (tagPtr->bgStipple != None) { Tk_FreeBitmap(textPtr->display, tagPtr->bgStipple); } if (tagPtr->fgColor != None) { Tk_FreeColor(tagPtr->fgColor); } if (tagPtr->fgStipple != None) { Tk_FreeBitmap(textPtr->display, tagPtr->fgStipple); } ckfree((char *) tagPtr); } /* *---------------------------------------------------------------------- * * SortTags -- * * This procedure sorts an array of tag pointers in increasing * order of priority, optimizing for the common case where the * array is small. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void SortTags(numTags, tagArrayPtr) int numTags; /* Number of tag pointers at *tagArrayPtr. */ TkTextTag **tagArrayPtr; /* Pointer to array of pointers. */ { int i, j, prio; register TkTextTag **tagPtrPtr; TkTextTag **maxPtrPtr, *tmp; if (numTags < 2) { return; } if (numTags < 20) { for (i = numTags-1; i > 0; i--, tagArrayPtr++) { maxPtrPtr = tagPtrPtr = tagArrayPtr; prio = tagPtrPtr[0]->priority; for (j = i, tagPtrPtr++; j > 0; j--, tagPtrPtr++) { if (tagPtrPtr[0]->priority < prio) { prio = tagPtrPtr[0]->priority; maxPtrPtr = tagPtrPtr; } } tmp = *maxPtrPtr; *maxPtrPtr = *tagArrayPtr; *tagArrayPtr = tmp; } } else { qsort((VOID *) tagArrayPtr, numTags, sizeof (TkTextTag *), TagSortProc); } } /* *---------------------------------------------------------------------- * * TagSortProc -- * * This procedure is called by qsort when sorting an array of * tags in priority order. * * Results: * The return value is -1 if the first argument should be before * the second element (i.e. it has lower priority), 0 if it's * equivalent (this should never happen!), and 1 if it should be * after the second element. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int TagSortProc(first, second) CONST VOID *first, *second; /* Elements to be compared. */ { TkTextTag *tagPtr1, *tagPtr2; tagPtr1 = * (TkTextTag **) first; tagPtr2 = * (TkTextTag **) second; return tagPtr1->priority - tagPtr2->priority; } /* *---------------------------------------------------------------------- * * ChangeTagPriority -- * * This procedure changes the priority of a tag by modifying * its priority and all other ones whose priority is affected * by the change. * * Results: * None. * * Side effects: * Priorities may be changed for some or all of the tags in * textPtr. The tags will be arranged so that there is exactly * one tag at each priority level between 0 and textPtr->numTags-1, * with tagPtr at priority "prio". * *---------------------------------------------------------------------- */ static void ChangeTagPriority(textPtr, tagPtr, prio) TkText *textPtr; /* Information about text widget. */ TkTextTag *tagPtr; /* Tag whose priority is to be * changed. */ int prio; /* New priority for tag. */ { int low, high, delta; register TkTextTag *tagPtr2; Tcl_HashEntry *hPtr; Tcl_HashSearch search; if (prio < 0) { prio = 0; } if (prio >= textPtr->numTags) { prio = textPtr->numTags-1; } if (prio == tagPtr->priority) { return; } else if (prio < tagPtr->priority) { low = prio; high = tagPtr->priority-1; delta = 1; } else { low = tagPtr->priority+1; high = prio; delta = -1; } for (hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search); hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) { tagPtr2 = (TkTextTag *) Tcl_GetHashValue(hPtr); if ((tagPtr2->priority >= low) && (tagPtr2->priority <= high)) { tagPtr2->priority += delta; } } tagPtr->priority = prio; } /* *-------------------------------------------------------------- * * TkTextBindProc -- * * This procedure 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). * *-------------------------------------------------------------- */ void TkTextBindProc(clientData, eventPtr) ClientData clientData; /* Pointer to canvas structure. */ XEvent *eventPtr; /* Pointer to X event that just * happened. */ { TkText *textPtr = (TkText *) clientData; int repick = 0; Tk_Preserve((ClientData) textPtr); /* * This code simulates grabs for mouse buttons by refusing to * pick a new current character between the time a mouse button goes * down and the time when the last mouse button is released. */ if (eventPtr->type == ButtonPress) { textPtr->flags |= BUTTON_DOWN; } else if (eventPtr->type == ButtonRelease) { int mask; 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; } if ((eventPtr->xbutton.state & (Button1Mask|Button2Mask |Button3Mask|Button4Mask|Button5Mask)) == mask) { textPtr->flags &= ~BUTTON_DOWN; repick = 1; } } else if ((eventPtr->type == EnterNotify) || (eventPtr->type == LeaveNotify)) { TkTextPickCurrent(textPtr, eventPtr); goto done; } else if (eventPtr->type == MotionNotify) { TkTextPickCurrent(textPtr, eventPtr); } TextDoEvent(textPtr, eventPtr); if (repick) { unsigned int oldState; oldState = eventPtr->xbutton.state; eventPtr->xbutton.state &= ~(Button1Mask|Button2Mask |Button3Mask|Button4Mask|Button5Mask); TkTextPickCurrent(textPtr, eventPtr); eventPtr->xbutton.state = oldState; } done: Tk_Release((ClientData) textPtr); } /* *-------------------------------------------------------------- * * TkTextPickCurrent -- * * 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 and a fake enter event on the new current * item. * * Results: * None. * * Side effects: * The current item for textPtr may change. If it does, * then the commands associated with item entry and exit * could do just about anything. * *-------------------------------------------------------------- */ void TkTextPickCurrent(textPtr, eventPtr) register TkText *textPtr; /* Text widget in which to select * current character. */ XEvent *eventPtr; /* Event describing location of * mouse cursor. Must be EnterWindow, * LeaveWindow, ButtonRelease, or * MotionNotify. */ { TkTextLine *linePtr; int ch; /* * If a button is down, then don't do anything at all; we'll be * called again when all buttons are up, and we can repick then. * This implements a form of mouse grabbing. */ if (textPtr->flags & BUTTON_DOWN) { return; } /* * Save information about this event in the widget for use if we have * to synthesize more enter and leave events later (e.g. because a * character was deleting, causing a new character to be underneath * the mouse cursor). Also translate MotionNotify events into * EnterNotify events, since that's what gets reported to event * handlers when the current character changes. */ if (eventPtr != &textPtr->pickEvent) { if ((eventPtr->type == MotionNotify) || (eventPtr->type == ButtonRelease)) { textPtr->pickEvent.xcrossing.type = EnterNotify; textPtr->pickEvent.xcrossing.serial = eventPtr->xmotion.serial; textPtr->pickEvent.xcrossing.send_event = eventPtr->xmotion.send_event; textPtr->pickEvent.xcrossing.display = eventPtr->xmotion.display; textPtr->pickEvent.xcrossing.window = eventPtr->xmotion.window; textPtr->pickEvent.xcrossing.root = eventPtr->xmotion.root; textPtr->pickEvent.xcrossing.subwindow = None; textPtr->pickEvent.xcrossing.time = eventPtr->xmotion.time; textPtr->pickEvent.xcrossing.x = eventPtr->xmotion.x; textPtr->pickEvent.xcrossing.y = eventPtr->xmotion.y; textPtr->pickEvent.xcrossing.x_root = eventPtr->xmotion.x_root; textPtr->pickEvent.xcrossing.y_root = eventPtr->xmotion.y_root; textPtr->pickEvent.xcrossing.mode = NotifyNormal; textPtr->pickEvent.xcrossing.detail = NotifyNonlinear; textPtr->pickEvent.xcrossing.same_screen = eventPtr->xmotion.same_screen; textPtr->pickEvent.xcrossing.focus = False; textPtr->pickEvent.xcrossing.state = eventPtr->xmotion.state; } else { textPtr->pickEvent = *eventPtr; } } linePtr = NULL; if (textPtr->pickEvent.type != LeaveNotify) { linePtr = TkTextCharAtLoc(textPtr, textPtr->pickEvent.xcrossing.x, textPtr->pickEvent.xcrossing.y, &ch); } /* * Simulate a LeaveNotify event on the previous current character and * an EnterNotify event on the new current character. Also, move the * "current" mark to its new place. */ if (textPtr->flags & IN_CURRENT) { if ((linePtr == textPtr->currentAnnotPtr->linePtr) && (ch == textPtr->currentAnnotPtr->ch)) { return; } } else { if (linePtr == NULL) { return; } } if (textPtr->flags & IN_CURRENT) { XEvent event; event = textPtr->pickEvent; event.type = LeaveNotify; TextDoEvent(textPtr, &event); textPtr->flags &= ~IN_CURRENT; } if (linePtr != NULL) { XEvent event; TkBTreeRemoveAnnotation(textPtr->currentAnnotPtr); textPtr->currentAnnotPtr->linePtr = linePtr; textPtr->currentAnnotPtr->ch = ch; TkBTreeAddAnnotation(textPtr->currentAnnotPtr); event = textPtr->pickEvent; event.type = EnterNotify; TextDoEvent(textPtr, &event); textPtr->flags |= IN_CURRENT; } } /* *---------------------------------------------------------------------- * * TkTextUnpickCurrent -- * * This procedure is called when the "current" character is * deleted: it synthesizes a "leave" event for the character. * * Results: * None. * * Side effects: * A binding associated with one of the tags on the current * character may be triggered. * *---------------------------------------------------------------------- */ void TkTextUnpickCurrent(textPtr) TkText *textPtr; /* Text widget information. */ { if (textPtr->flags & IN_CURRENT) { XEvent event; event = textPtr->pickEvent; event.type = LeaveNotify; TextDoEvent(textPtr, &event); textPtr->flags &= ~IN_CURRENT; } } /* *-------------------------------------------------------------- * * TextDoEvent -- * * This procedure is called to invoke binding processing * for a new event that is associated with the current character * for a text widget. * * Results: * None. * * Side effects: * Depends on the bindings for the text. * *-------------------------------------------------------------- */ static void TextDoEvent(textPtr, eventPtr) TkText *textPtr; /* Text widget in which event * occurred. */ XEvent *eventPtr; /* Real or simulated X event that * is to be processed. */ { TkTextTag **tagArrayPtr, **p1, **p2, *tmp; int numTags; if (textPtr->bindingTable == NULL) { return; } /* * Set up an array containing all of the tags that are associated * with the current character. This array will be used to look * for bindings. If there are no tags then there can't be any * bindings. */ tagArrayPtr = TkBTreeGetTags(textPtr->tree, textPtr->currentAnnotPtr->linePtr, textPtr->currentAnnotPtr->ch, &numTags); if (numTags == 0) { return; } /* * Sort the array of tags. SortTags sorts it backwards, so after it * returns we have to reverse the order in the array. */ SortTags(numTags, tagArrayPtr); for (p1 = tagArrayPtr, p2 = tagArrayPtr + numTags - 1; p1 < p2; p1++, p2--) { tmp = *p1; *p1 = *p2; *p2 = tmp; } /* * Invoke the binding system, then free up the tag array. */ Tk_BindEvent(textPtr->bindingTable, eventPtr, textPtr->tkwin, numTags, (ClientData *) tagArrayPtr); ckfree((char *) tagArrayPtr); }