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1/*
2 * tkTextTag.c --
3 *
4 * This module implements the "tag" subcommand of the widget command
5 * for text widgets, plus most of the other high-level functions
6 * related to tags.
7 *
8 * Copyright 1992 Regents of the University of California.
9 * Permission to use, copy, modify, and distribute this
10 * software and its documentation for any purpose and without
11 * fee is hereby granted, provided that the above copyright
12 * notice appear in all copies. The University of California
13 * makes no representations about the suitability of this
14 * software for any purpose. It is provided "as is" without
15 * express or implied warranty.
16 */
17
18#ifndef lint
19static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkTextTag.c,v 1.3 92/07/28 15:38:59 ouster Exp $ SPRITE (Berkeley)";
20#endif
21
22#include "default.h"
23#include "tkconfig.h"
24#include "tk.h"
25#include "tktext.h"
26
27/*
28 * Information used for parsing tag configuration information:
29 */
30
31static Tk_ConfigSpec tagConfigSpecs[] = {
32 {TK_CONFIG_BORDER, "-background", (char *) NULL, (char *) NULL,
33 (char *) NULL, Tk_Offset(TkTextTag, border), TK_CONFIG_NULL_OK},
34 {TK_CONFIG_BITMAP, "-bgstipple", (char *) NULL, (char *) NULL,
35 (char *) NULL, Tk_Offset(TkTextTag, bgStipple), TK_CONFIG_NULL_OK},
36 {TK_CONFIG_PIXELS, "-borderwidth", (char *) NULL, (char *) NULL,
37 "0", Tk_Offset(TkTextTag, borderWidth), TK_CONFIG_DONT_SET_DEFAULT},
38 {TK_CONFIG_BITMAP, "-fgstipple", (char *) NULL, (char *) NULL,
39 (char *) NULL, Tk_Offset(TkTextTag, fgStipple), TK_CONFIG_NULL_OK},
40 {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL,
41 (char *) NULL, Tk_Offset(TkTextTag, fontPtr), TK_CONFIG_NULL_OK},
42 {TK_CONFIG_COLOR, "-foreground", (char *) NULL, (char *) NULL,
43 (char *) NULL, Tk_Offset(TkTextTag, fgColor), TK_CONFIG_NULL_OK},
44 {TK_CONFIG_RELIEF, "-relief", (char *) NULL, (char *) NULL,
45 "flat", Tk_Offset(TkTextTag, relief), TK_CONFIG_DONT_SET_DEFAULT},
46 {TK_CONFIG_BOOLEAN, "-underline", (char *) NULL, (char *) NULL,
47 "false", Tk_Offset(TkTextTag, underline), TK_CONFIG_DONT_SET_DEFAULT},
48 {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
49 (char *) NULL, 0, 0}
50};
51
52
53/*
54 * The following definition specifies the maximum number of characters
55 * needed in a string to hold a position specifier.
56 */
57
58#define POS_CHARS 30
59
60/*
61 * Forward declarations for procedures defined later in this file:
62 */
63
64static void ChangeTagPriority _ANSI_ARGS_((TkText *textPtr,
65 TkTextTag *tagPtr, int prio));
66static TkTextTag * FindTag _ANSI_ARGS_((Tcl_Interp *interp,
67 TkText *textPtr, char *tagName));
68static void SortTags _ANSI_ARGS_((int numTags,
69 TkTextTag **tagArrayPtr));
70static int TagSortProc _ANSI_ARGS_((CONST VOID *first,
71 CONST VOID *second));
72static void TextDoEvent _ANSI_ARGS_((TkText *textPtr,
73 XEvent *eventPtr));
74\f
75/*
76 *--------------------------------------------------------------
77 *
78 * TkTextTagCmd --
79 *
80 * This procedure is invoked to process the "tag" options of
81 * the widget command for text widgets. See the user documentation
82 * for details on what it does.
83 *
84 * Results:
85 * A standard Tcl result.
86 *
87 * Side effects:
88 * See the user documentation.
89 *
90 *--------------------------------------------------------------
91 */
92
93int
94TkTextTagCmd(textPtr, interp, argc, argv)
95 register TkText *textPtr; /* Information about text widget. */
96 Tcl_Interp *interp; /* Current interpreter. */
97 int argc; /* Number of arguments. */
98 char **argv; /* Argument strings. Someone else has already
99 * parsed this command enough to know that
100 * argv[1] is "tag". */
101{
102 int length, line1, ch1, line2, ch2, i, addTag;
103 char c;
104 char *fullOption;
105 register TkTextTag *tagPtr;
106
107 if (argc < 3) {
108 Tcl_AppendResult(interp, "wrong # args: should be \"",
109 argv[0], " tag option ?arg arg ...?\"", (char *) NULL);
110 return TCL_ERROR;
111 }
112 c = argv[2][0];
113 length = strlen(argv[2]);
114 if ((c == 'a') && (strncmp(argv[2], "add", length) == 0)) {
115 fullOption = "add";
116 addTag = 1;
117
118 addAndRemove:
119 if ((argc != 5) && (argc != 6)) {
120 Tcl_AppendResult(interp, "wrong # args: should be \"",
121 argv[0], " tag ", fullOption, " tagName index1 ?index2?\"",
122 (char *) NULL);
123 return TCL_ERROR;
124 }
125 tagPtr = TkTextCreateTag(textPtr, argv[3]);
126 if (TkTextGetIndex(interp, textPtr, argv[4], &line1, &ch1) != TCL_OK) {
127 return TCL_ERROR;
128 }
129 if (argc == 6) {
130 if (TkTextGetIndex(interp, textPtr, argv[5], &line2, &ch2)
131 != TCL_OK) {
132 return TCL_ERROR;
133 }
134 } else {
135 line2 = line1;
136 ch2 = ch1+1;
137 }
138 if (TK_TAG_AFFECTS_DISPLAY(tagPtr)) {
139 TkTextRedrawTag(textPtr, line1, ch1, line2, ch2, tagPtr, !addTag);
140 }
141 TkBTreeTag(textPtr->tree, line1, ch1, line2, ch2, tagPtr, addTag);
142
143 /*
144 * If the tag is "sel" then grab the selection if we're supposed
145 * to export it and don't already have it. Also, invalidate
146 * partially-completed selection retrievals.
147 */
148
149 if (tagPtr == textPtr->selTagPtr) {
150 if (addTag && textPtr->exportSelection
151 && !(textPtr->flags & GOT_SELECTION)) {
152 Tk_OwnSelection(textPtr->tkwin, TkTextLostSelection,
153 (ClientData) textPtr);
154 textPtr->flags |= GOT_SELECTION;
155 }
156 textPtr->selOffset = -1;
157 }
158 } else if ((c == 'b') && (strncmp(argv[2], "bind", length) == 0)) {
159 if ((argc < 4) || (argc > 6)) {
160 Tcl_AppendResult(interp, "wrong # args: should be \"",
161 argv[0], " tag bind tagName ?sequence? ?command?\"",
162 (char *) NULL);
163 return TCL_ERROR;
164 }
165 tagPtr = TkTextCreateTag(textPtr, argv[3]);
166
167 /*
168 * Make a binding table if the widget doesn't already have
169 * one.
170 */
171
172 if (textPtr->bindingTable == NULL) {
173 textPtr->bindingTable = Tk_CreateBindingTable(interp);
174 }
175
176 if (argc == 6) {
177 int append = 0;
178 unsigned long mask;
179
180 if (argv[5][0] == 0) {
181 return Tk_DeleteBinding(interp, textPtr->bindingTable,
182 (ClientData) tagPtr, argv[4]);
183 }
184 if (argv[5][0] == '+') {
185 argv[5]++;
186 append = 1;
187 }
188 mask = Tk_CreateBinding(interp, textPtr->bindingTable,
189 (ClientData) tagPtr, argv[4], argv[5], append);
190 if (mask == 0) {
191 return TCL_ERROR;
192 }
193 if (mask & ~(ButtonMotionMask|Button1MotionMask|Button2MotionMask
194 |Button3MotionMask|Button4MotionMask|Button5MotionMask
195 |ButtonPressMask|ButtonReleaseMask|EnterWindowMask
196 |LeaveWindowMask|KeyPressMask|KeyReleaseMask
197 |PointerMotionMask)) {
198 Tk_DeleteBinding(interp, textPtr->bindingTable,
199 (ClientData) tagPtr, argv[4]);
200 Tcl_ResetResult(interp);
201 Tcl_AppendResult(interp, "requested illegal events; ",
202 "only key, button, motion, and enter/leave ",
203 "events may be used", (char *) NULL);
204 return TCL_ERROR;
205 }
206 } else if (argc == 5) {
207 char *command;
208
209 command = Tk_GetBinding(interp, textPtr->bindingTable,
210 (ClientData) tagPtr, argv[4]);
211 if (command == NULL) {
212 return TCL_ERROR;
213 }
214 interp->result = command;
215 } else {
216 Tk_GetAllBindings(interp, textPtr->bindingTable,
217 (ClientData) tagPtr);
218 }
219 } else if ((c == 'c') && (strncmp(argv[2], "configure", length) == 0)) {
220 if (argc < 4) {
221 Tcl_AppendResult(interp, "wrong # args: should be \"",
222 argv[0], " tag configure tagName ?option? ?value? ",
223 "?option value ...?\"", (char *) NULL);
224 return TCL_ERROR;
225 }
226 tagPtr = TkTextCreateTag(textPtr, argv[3]);
227 if (argc == 4) {
228 return Tk_ConfigureInfo(interp, textPtr->tkwin, tagConfigSpecs,
229 (char *) tagPtr, (char *) NULL, 0);
230 } else if (argc == 5) {
231 return Tk_ConfigureInfo(interp, textPtr->tkwin, tagConfigSpecs,
232 (char *) tagPtr, argv[4], 0);
233 } else {
234 int result;
235
236 result = Tk_ConfigureWidget(interp, textPtr->tkwin, tagConfigSpecs,
237 argc-4, argv+4, (char *) tagPtr, 0);
238 /*
239 * If the "sel" tag was changed, be sure to mirror information
240 * from the tag back into the text widget record. NOTE: we
241 * don't have to free up information in the widget record
242 * before overwriting it, because it was mirrored in the tag
243 * and hence freed when the tag field was overwritten.
244 */
245
246 if (tagPtr == textPtr->selTagPtr) {
247 textPtr->selBorder = tagPtr->border;
248 textPtr->selBorderWidth = tagPtr->borderWidth;
249 textPtr->selFgColorPtr = tagPtr->fgColor;
250 }
251 TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree),
252 0, tagPtr, 1);
253 return result;
254 }
255 } else if ((c == 'd') && (strncmp(argv[2], "delete", length) == 0)) {
256 Tcl_HashEntry *hPtr;
257
258 if (argc < 4) {
259 Tcl_AppendResult(interp, "wrong # args: should be \"",
260 argv[0], " tag delete tagName tagName ...\"",
261 (char *) NULL);
262 return TCL_ERROR;
263 }
264 for (i = 3; i < argc; i++) {
265 hPtr = Tcl_FindHashEntry(&textPtr->tagTable, argv[i]);
266 if (hPtr == NULL) {
267 continue;
268 }
269 tagPtr = (TkTextTag *) Tcl_GetHashValue(hPtr);
270 if (tagPtr == textPtr->selTagPtr) {
271 interp->result = "can't delete selection tag";
272 return TCL_ERROR;
273 }
274 if (TK_TAG_AFFECTS_DISPLAY(tagPtr)) {
275 TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree),
276 0, tagPtr, 1);
277 }
278 TkBTreeTag(textPtr->tree, 0, 0, TkBTreeNumLines(textPtr->tree),
279 0, tagPtr, 0);
280 Tcl_DeleteHashEntry(hPtr);
281 if (textPtr->bindingTable != NULL) {
282 Tk_DeleteAllBindings(textPtr->bindingTable,
283 (ClientData) tagPtr);
284 }
285
286 /*
287 * Update the tag priorities to reflect the deletion of this tag.
288 */
289
290 ChangeTagPriority(textPtr, tagPtr, textPtr->numTags-1);
291 textPtr->numTags -= 1;
292 TkTextFreeTag(tagPtr);
293 }
294 } else if ((c == 'l') && (strncmp(argv[2], "lower", length) == 0)) {
295 TkTextTag *tagPtr2;
296 int prio;
297
298 if ((argc != 4) && (argc != 5)) {
299 Tcl_AppendResult(interp, "wrong # args: should be \"",
300 argv[0], " tag lower tagName ?belowThis?\"",
301 (char *) NULL);
302 return TCL_ERROR;
303 }
304 tagPtr = FindTag(interp, textPtr, argv[3]);
305 if (tagPtr == NULL) {
306 return TCL_ERROR;
307 }
308 if (argc == 5) {
309 tagPtr2 = FindTag(interp, textPtr, argv[4]);
310 if (tagPtr2 == NULL) {
311 return TCL_ERROR;
312 }
313 if (tagPtr->priority < tagPtr2->priority) {
314 prio = tagPtr2->priority - 1;
315 } else {
316 prio = tagPtr2->priority;
317 }
318 } else {
319 prio = 0;
320 }
321 ChangeTagPriority(textPtr, tagPtr, prio);
322 TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree),
323 0, tagPtr, 1);
324 } else if ((c == 'n') && (strncmp(argv[2], "names", length) == 0)
325 && (length >= 2)) {
326 TkTextTag **arrayPtr;
327 int arraySize;
328 TkTextLine *linePtr;
329
330 if ((argc != 3) && (argc != 4)) {
331 Tcl_AppendResult(interp, "wrong # args: should be \"",
332 argv[0], " tag names ?index?\"",
333 (char *) NULL);
334 return TCL_ERROR;
335 }
336 if (argc == 3) {
337 Tcl_HashSearch search;
338 Tcl_HashEntry *hPtr;
339
340 arrayPtr = (TkTextTag **) ckalloc((unsigned)
341 (textPtr->numTags * sizeof(TkTextTag *)));
342 for (i = 0, hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search);
343 hPtr != NULL; i++, hPtr = Tcl_NextHashEntry(&search)) {
344 arrayPtr[i] = (TkTextTag *) Tcl_GetHashValue(hPtr);
345 }
346 arraySize = textPtr->numTags;
347 } else {
348 if (TkTextGetIndex(interp, textPtr, argv[3], &line1, &ch1)
349 != TCL_OK) {
350 return TCL_ERROR;
351 }
352 linePtr = TkBTreeFindLine(textPtr->tree, line1);
353 if (linePtr == NULL) {
354 return TCL_OK;
355 }
356 arrayPtr = TkBTreeGetTags(textPtr->tree, linePtr, ch1, &arraySize);
357 if (arrayPtr == NULL) {
358 return TCL_OK;
359 }
360 }
361 SortTags(arraySize, arrayPtr);
362 for (i = 0; i < arraySize; i++) {
363 tagPtr = arrayPtr[i];
364 Tcl_AppendElement(interp, tagPtr->name, 0);
365 }
366 ckfree((char *) arrayPtr);
367 } else if ((c == 'n') && (strncmp(argv[2], "nextrange", length) == 0)
368 && (length >= 2)) {
369 TkTextSearch tSearch;
370 char position[POS_CHARS];
371
372 if ((argc != 5) && (argc != 6)) {
373 Tcl_AppendResult(interp, "wrong # args: should be \"",
374 argv[0], " tag nextrange tagName index1 ?index2?\"",
375 (char *) NULL);
376 return TCL_ERROR;
377 }
378 tagPtr = FindTag((Tcl_Interp *) NULL, textPtr, argv[3]);
379 if (tagPtr == NULL) {
380 return TCL_OK;
381 }
382 if (TkTextGetIndex(interp, textPtr, argv[4], &line1, &ch1) != TCL_OK) {
383 return TCL_ERROR;
384 }
385 if (argc == 5) {
386 line2 = TkBTreeNumLines(textPtr->tree);
387 ch2 = 0;
388 } else if (TkTextGetIndex(interp, textPtr, argv[5], &line2, &ch2)
389 != TCL_OK) {
390 return TCL_ERROR;
391 }
392
393 /*
394 * The search below is a bit tricky. Rather than use the B-tree
395 * facilities to stop the search at line2.ch2, let it search up
396 * until the end of the file but check for a position past line2.ch2
397 * ourselves. The reason for doing it this way is that we only
398 * care whether the *start* of the range is before line2.ch2; once
399 * we find the start, we don't want TkBTreeNextTag to abort the
400 * search because the end of the range is after line2.ch2.
401 */
402
403 TkBTreeStartSearch(textPtr->tree, line1, ch1,
404 TkBTreeNumLines(textPtr->tree), 0, tagPtr, &tSearch);
405 if (!TkBTreeNextTag(&tSearch)) {
406 return TCL_OK;
407 }
408 if (!TkBTreeCharTagged(tSearch.linePtr, tSearch.ch1, tagPtr)) {
409 if (!TkBTreeNextTag(&tSearch)) {
410 return TCL_OK;
411 }
412 }
413 if ((tSearch.line1 > line2) || ((tSearch.line1 == line2)
414 && (tSearch.ch1 >= ch2))) {
415 return TCL_OK;
416 }
417 TkTextPrintIndex(tSearch.line1, tSearch.ch1, position);
418 Tcl_AppendElement(interp, position, 0);
419 TkBTreeNextTag(&tSearch);
420 TkTextPrintIndex(tSearch.line1, tSearch.ch1, position);
421 Tcl_AppendElement(interp, position, 0);
422 } else if ((c == 'r') && (strncmp(argv[2], "raise", length) == 0)
423 && (length >= 3)) {
424 TkTextTag *tagPtr2;
425 int prio;
426
427 if ((argc != 4) && (argc != 5)) {
428 Tcl_AppendResult(interp, "wrong # args: should be \"",
429 argv[0], " tag raise tagName ?aboveThis?\"",
430 (char *) NULL);
431 return TCL_ERROR;
432 }
433 tagPtr = FindTag(interp, textPtr, argv[3]);
434 if (tagPtr == NULL) {
435 return TCL_ERROR;
436 }
437 if (argc == 5) {
438 tagPtr2 = FindTag(interp, textPtr, argv[4]);
439 if (tagPtr2 == NULL) {
440 return TCL_ERROR;
441 }
442 if (tagPtr->priority <= tagPtr2->priority) {
443 prio = tagPtr2->priority;
444 } else {
445 prio = tagPtr2->priority + 1;
446 }
447 } else {
448 prio = textPtr->numTags-1;
449 }
450 ChangeTagPriority(textPtr, tagPtr, prio);
451 TkTextRedrawTag(textPtr, 0, 0, TkBTreeNumLines(textPtr->tree),
452 0, tagPtr, 1);
453 } else if ((c == 'r') && (strncmp(argv[2], "ranges", length) == 0)
454 && (length >= 3)) {
455 TkTextSearch tSearch;
456 char position[POS_CHARS];
457
458 if (argc != 4) {
459 Tcl_AppendResult(interp, "wrong # args: should be \"",
460 argv[0], " tag ranges tagName\"", (char *) NULL);
461 return TCL_ERROR;
462 }
463 tagPtr = FindTag((Tcl_Interp *) NULL, textPtr, argv[3]);
464 if (tagPtr == NULL) {
465 return TCL_OK;
466 }
467 TkBTreeStartSearch(textPtr->tree, 0, 0, TkBTreeNumLines(textPtr->tree),
468 0, tagPtr, &tSearch);
469 while (TkBTreeNextTag(&tSearch)) {
470 TkTextPrintIndex(tSearch.line1, tSearch.ch1, position);
471 Tcl_AppendElement(interp, position, 0);
472 }
473 } else if ((c == 'r') && (strncmp(argv[2], "remove", length) == 0)
474 && (length >= 2)) {
475 fullOption = "remove";
476 addTag = 0;
477 goto addAndRemove;
478 } else {
479 Tcl_AppendResult(interp, "bad tag option \"", argv[2],
480 "\": must be add, bind, configure, delete, lower, ",
481 "names, nextrange, raise, ranges, or remove",
482 (char *) NULL);
483 return TCL_ERROR;
484 }
485 return TCL_OK;
486}
487\f
488/*
489 *----------------------------------------------------------------------
490 *
491 * TkTextCreateTag --
492 *
493 * Find the record describing a tag within a given text widget,
494 * creating a new record if one doesn't already exist.
495 *
496 * Results:
497 * The return value is a pointer to the TkTextTag record for tagName.
498 *
499 * Side effects:
500 * A new tag record is created if there isn't one already defined
501 * for tagName.
502 *
503 *----------------------------------------------------------------------
504 */
505
506TkTextTag *
507TkTextCreateTag(textPtr, tagName)
508 TkText *textPtr; /* Widget in which tag is being used. */
509 char *tagName; /* Name of desired tag. */
510{
511 register TkTextTag *tagPtr;
512 Tcl_HashEntry *hPtr;
513 int new;
514
515 hPtr = Tcl_CreateHashEntry(&textPtr->tagTable, tagName, &new);
516 if (!new) {
517 return (TkTextTag *) Tcl_GetHashValue(hPtr);
518 }
519
520 /*
521 * No existing entry. Create a new one, initialize it, and add a
522 * pointer to it to the hash table entry.
523 */
524
525 tagPtr = (TkTextTag *) ckalloc(sizeof(TkTextTag));
526 tagPtr->name = Tcl_GetHashKey(&textPtr->tagTable, hPtr);
527 tagPtr->priority = textPtr->numTags;
528 tagPtr->border = NULL;
529 tagPtr->borderWidth = 1;
530 tagPtr->relief = TK_RELIEF_FLAT;
531 tagPtr->bgStipple = None;
532 tagPtr->fgColor = NULL;
533 tagPtr->fontPtr = NULL;
534 tagPtr->fgStipple = None;
535 tagPtr->underline = 0;
536 textPtr->numTags++;
537 Tcl_SetHashValue(hPtr, tagPtr);
538 return tagPtr;
539}
540\f
541/*
542 *----------------------------------------------------------------------
543 *
544 * FindTag --
545 *
546 * See if tag is defined for a given widget.
547 *
548 * Results:
549 * If tagName is defined in textPtr, a pointer to its TkTextTag
550 * structure is returned. Otherwise NULL is returned and an
551 * error message is recorded in interp->result unless interp
552 * is NULL.
553 *
554 * Side effects:
555 * None.
556 *
557 *----------------------------------------------------------------------
558 */
559
560static TkTextTag *
561FindTag(interp, textPtr, tagName)
562 Tcl_Interp *interp; /* Interpreter to use for error message;
563 * if NULL, then don't record an error
564 * message. */
565 TkText *textPtr; /* Widget in which tag is being used. */
566 char *tagName; /* Name of desired tag. */
567{
568 Tcl_HashEntry *hPtr;
569
570 hPtr = Tcl_FindHashEntry(&textPtr->tagTable, tagName);
571 if (hPtr != NULL) {
572 return (TkTextTag *) Tcl_GetHashValue(hPtr);
573 }
574 if (interp != NULL) {
575 Tcl_AppendResult(interp, "tag \"", tagName,
576 "\" isn't defined in text widget", (char *) NULL);
577 }
578 return NULL;
579}
580\f
581/*
582 *----------------------------------------------------------------------
583 *
584 * TkTextFreeTag --
585 *
586 * This procedure is called when a tag is deleted to free up the
587 * memory and other resources associated with the tag.
588 *
589 * Results:
590 * None.
591 *
592 * Side effects:
593 * Memory and other resources are freed.
594 *
595 *----------------------------------------------------------------------
596 */
597
598void
599TkTextFreeTag(tagPtr)
600 register TkTextTag *tagPtr; /* Tag being deleted. */
601{
602 if (tagPtr->border != None) {
603 Tk_Free3DBorder(tagPtr->border);
604 }
605 if (tagPtr->bgStipple != None) {
606 Tk_FreeBitmap(tagPtr->bgStipple);
607 }
608 if (tagPtr->fgColor != None) {
609 Tk_FreeColor(tagPtr->fgColor);
610 }
611 if (tagPtr->fgStipple != None) {
612 Tk_FreeBitmap(tagPtr->fgStipple);
613 }
614 ckfree((char *) tagPtr);
615}
616\f
617/*
618 *----------------------------------------------------------------------
619 *
620 * SortTags --
621 *
622 * This procedure sorts an array of tag pointers in increasing
623 * order of priority, optimizing for the common case where the
624 * array is small.
625 *
626 * Results:
627 * None.
628 *
629 * Side effects:
630 * None.
631 *
632 *----------------------------------------------------------------------
633 */
634
635static void
636SortTags(numTags, tagArrayPtr)
637 int numTags; /* Number of tag pointers at *tagArrayPtr. */
638 TkTextTag **tagArrayPtr; /* Pointer to array of pointers. */
639{
640 int i, j, prio;
641 register TkTextTag **tagPtrPtr;
642 TkTextTag **maxPtrPtr, *tmp;
643
644 if (numTags < 2) {
645 return;
646 }
647 if (numTags < 20) {
648 for (i = numTags-1; i > 0; i--, tagArrayPtr++) {
649 maxPtrPtr = tagPtrPtr = tagArrayPtr;
650 prio = tagPtrPtr[0]->priority;
651 for (j = i, tagPtrPtr++; j > 0; j--, tagPtrPtr++) {
652 if (tagPtrPtr[0]->priority < prio) {
653 prio = tagPtrPtr[0]->priority;
654 maxPtrPtr = tagPtrPtr;
655 }
656 }
657 tmp = *maxPtrPtr;
658 *maxPtrPtr = *tagArrayPtr;
659 *tagArrayPtr = tmp;
660 }
661 } else {
662 qsort((VOID *) tagArrayPtr, numTags, sizeof (TkTextTag *),
663 TagSortProc);
664 }
665}
666\f
667/*
668 *----------------------------------------------------------------------
669 *
670 * TagSortProc --
671 *
672 * This procedure is called by qsort when sorting an array of
673 * tags in priority order.
674 *
675 * Results:
676 * The return value is -1 if the first argument should be before
677 * the second element (i.e. it has lower priority), 0 if it's
678 * equivalent (this should never happen!), and 1 if it should be
679 * after the second element.
680 *
681 * Side effects:
682 * None.
683 *
684 *----------------------------------------------------------------------
685 */
686
687static int
688TagSortProc(first, second)
689 CONST VOID *first, *second; /* Elements to be compared. */
690{
691 TkTextTag *tagPtr1, *tagPtr2;
692
693 tagPtr1 = * (TkTextTag **) first;
694 tagPtr2 = * (TkTextTag **) second;
695 return tagPtr1->priority - tagPtr2->priority;
696}
697\f
698/*
699 *----------------------------------------------------------------------
700 *
701 * ChangeTagPriority --
702 *
703 * This procedure changes the priority of a tag by modifying
704 * its priority and all other ones whose priority is affected
705 * by the change.
706 *
707 * Results:
708 * None.
709 *
710 * Side effects:
711 * Priorities may be changed for some or all of the tags in
712 * textPtr. The tags will be arranged so that there is exactly
713 * one tag at each priority level between 0 and textPtr->numTags-1,
714 * with tagPtr at priority "prio".
715 *
716 *----------------------------------------------------------------------
717 */
718
719static void
720ChangeTagPriority(textPtr, tagPtr, prio)
721 TkText *textPtr; /* Information about text widget. */
722 TkTextTag *tagPtr; /* Tag whose priority is to be
723 * changed. */
724 int prio; /* New priority for tag. */
725{
726 int low, high, delta;
727 register TkTextTag *tagPtr2;
728 Tcl_HashEntry *hPtr;
729 Tcl_HashSearch search;
730
731 if (prio < 0) {
732 prio = 0;
733 }
734 if (prio >= textPtr->numTags) {
735 prio = textPtr->numTags-1;
736 }
737 if (prio == tagPtr->priority) {
738 return;
739 } else if (prio < tagPtr->priority) {
740 low = prio;
741 high = tagPtr->priority-1;
742 delta = 1;
743 } else {
744 low = tagPtr->priority+1;
745 high = prio;
746 delta = -1;
747 }
748 for (hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search);
749 hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
750 tagPtr2 = (TkTextTag *) Tcl_GetHashValue(hPtr);
751 if ((tagPtr2->priority >= low) && (tagPtr2->priority <= high)) {
752 tagPtr2->priority += delta;
753 }
754 }
755 tagPtr->priority = prio;
756}
757\f
758/*
759 *--------------------------------------------------------------
760 *
761 * TkTextBindProc --
762 *
763 * This procedure is invoked by the Tk dispatcher to handle
764 * events associated with bindings on items.
765 *
766 * Results:
767 * None.
768 *
769 * Side effects:
770 * Depends on the command invoked as part of the binding
771 * (if there was any).
772 *
773 *--------------------------------------------------------------
774 */
775
776void
777TkTextBindProc(clientData, eventPtr)
778 ClientData clientData; /* Pointer to canvas structure. */
779 XEvent *eventPtr; /* Pointer to X event that just
780 * happened. */
781{
782 TkText *textPtr = (TkText *) clientData;
783 int repick = 0;
784
785 Tk_Preserve((ClientData) textPtr);
786
787 /*
788 * This code simulates grabs for mouse buttons by refusing to
789 * pick a new current character between the time a mouse button goes
790 * down and the time when the last mouse button is released.
791 */
792
793 if (eventPtr->type == ButtonPress) {
794 textPtr->flags |= BUTTON_DOWN;
795 } else if (eventPtr->type == ButtonRelease) {
796 int mask;
797
798 switch (eventPtr->xbutton.button) {
799 case Button1:
800 mask = Button1Mask;
801 break;
802 case Button2:
803 mask = Button2Mask;
804 break;
805 case Button3:
806 mask = Button3Mask;
807 break;
808 case Button4:
809 mask = Button4Mask;
810 break;
811 case Button5:
812 mask = Button5Mask;
813 break;
814 default:
815 mask = 0;
816 break;
817 }
818 if ((eventPtr->xbutton.state & (Button1Mask|Button2Mask
819 |Button3Mask|Button4Mask|Button5Mask)) == mask) {
820 textPtr->flags &= ~BUTTON_DOWN;
821 repick = 1;
822 }
823 } else if ((eventPtr->type == EnterNotify)
824 || (eventPtr->type == LeaveNotify)) {
825 TkTextPickCurrent(textPtr, eventPtr);
826 goto done;
827 } else if (eventPtr->type == MotionNotify) {
828 TkTextPickCurrent(textPtr, eventPtr);
829 }
830 TextDoEvent(textPtr, eventPtr);
831 if (repick) {
832 unsigned int oldState;
833
834 oldState = eventPtr->xbutton.state;
835 eventPtr->xbutton.state &= ~(Button1Mask|Button2Mask
836 |Button3Mask|Button4Mask|Button5Mask);
837 TkTextPickCurrent(textPtr, eventPtr);
838 eventPtr->xbutton.state = oldState;
839 }
840
841 done:
842 Tk_Release((ClientData) textPtr);
843}
844\f
845/*
846 *--------------------------------------------------------------
847 *
848 * TkTextPickCurrent --
849 *
850 * Find the topmost item in a canvas that contains a given
851 * location and mark the the current item. If the current
852 * item has changed, generate a fake exit event on the old
853 * current item and a fake enter event on the new current
854 * item.
855 *
856 * Results:
857 * None.
858 *
859 * Side effects:
860 * The current item for textPtr may change. If it does,
861 * then the commands associated with item entry and exit
862 * could do just about anything.
863 *
864 *--------------------------------------------------------------
865 */
866
867void
868TkTextPickCurrent(textPtr, eventPtr)
869 register TkText *textPtr; /* Text widget in which to select
870 * current character. */
871 XEvent *eventPtr; /* Event describing location of
872 * mouse cursor. Must be EnterWindow,
873 * LeaveWindow, ButtonRelease, or
874 * MotionNotify. */
875{
876 TkTextLine *linePtr;
877 int ch;
878
879 /*
880 * If a button is down, then don't do anything at all; we'll be
881 * called again when all buttons are up, and we can repick then.
882 * This implements a form of mouse grabbing.
883 */
884
885 if (textPtr->flags & BUTTON_DOWN) {
886 return;
887 }
888
889 /*
890 * Save information about this event in the widget for use if we have
891 * to synthesize more enter and leave events later (e.g. because a
892 * character was deleting, causing a new character to be underneath
893 * the mouse cursor). Also translate MotionNotify events into
894 * EnterNotify events, since that's what gets reported to event
895 * handlers when the current character changes.
896 */
897
898 if (eventPtr != &textPtr->pickEvent) {
899 if ((eventPtr->type == MotionNotify)
900 || (eventPtr->type == ButtonRelease)) {
901 textPtr->pickEvent.xcrossing.type = EnterNotify;
902 textPtr->pickEvent.xcrossing.serial = eventPtr->xmotion.serial;
903 textPtr->pickEvent.xcrossing.send_event
904 = eventPtr->xmotion.send_event;
905 textPtr->pickEvent.xcrossing.display = eventPtr->xmotion.display;
906 textPtr->pickEvent.xcrossing.window = eventPtr->xmotion.window;
907 textPtr->pickEvent.xcrossing.root = eventPtr->xmotion.root;
908 textPtr->pickEvent.xcrossing.subwindow = None;
909 textPtr->pickEvent.xcrossing.time = eventPtr->xmotion.time;
910 textPtr->pickEvent.xcrossing.x = eventPtr->xmotion.x;
911 textPtr->pickEvent.xcrossing.y = eventPtr->xmotion.y;
912 textPtr->pickEvent.xcrossing.x_root = eventPtr->xmotion.x_root;
913 textPtr->pickEvent.xcrossing.y_root = eventPtr->xmotion.y_root;
914 textPtr->pickEvent.xcrossing.mode = NotifyNormal;
915 textPtr->pickEvent.xcrossing.detail = NotifyNonlinear;
916 textPtr->pickEvent.xcrossing.same_screen
917 = eventPtr->xmotion.same_screen;
918 textPtr->pickEvent.xcrossing.focus = False;
919 textPtr->pickEvent.xcrossing.state = eventPtr->xmotion.state;
920 } else {
921 textPtr->pickEvent = *eventPtr;
922 }
923 }
924
925 linePtr = NULL;
926 if (textPtr->pickEvent.type != LeaveNotify) {
927 linePtr = TkTextCharAtLoc(textPtr, textPtr->pickEvent.xcrossing.x,
928 textPtr->pickEvent.xcrossing.y, &ch);
929 }
930
931 /*
932 * Simulate a LeaveNotify event on the previous current character and
933 * an EnterNotify event on the new current character. Also, move the
934 * "current" mark to its new place.
935 */
936
937 if (textPtr->flags & IN_CURRENT) {
938 if ((linePtr == textPtr->currentAnnotPtr->linePtr)
939 && (ch == textPtr->currentAnnotPtr->ch)) {
940 return;
941 }
942 } else {
943 if (linePtr == NULL) {
944 return;
945 }
946 }
947 if (textPtr->flags & IN_CURRENT) {
948 XEvent event;
949
950 event = textPtr->pickEvent;
951 event.type = LeaveNotify;
952 TextDoEvent(textPtr, &event);
953 textPtr->flags &= ~IN_CURRENT;
954 }
955 if (linePtr != NULL) {
956 XEvent event;
957
958 TkBTreeRemoveAnnotation(textPtr->currentAnnotPtr);
959 textPtr->currentAnnotPtr->linePtr = linePtr;
960 textPtr->currentAnnotPtr->ch = ch;
961 TkBTreeAddAnnotation(textPtr->currentAnnotPtr);
962 event = textPtr->pickEvent;
963 event.type = EnterNotify;
964 TextDoEvent(textPtr, &event);
965 textPtr->flags |= IN_CURRENT;
966 }
967}
968\f
969/*
970 *----------------------------------------------------------------------
971 *
972 * TkTextUnpickCurrent --
973 *
974 * This procedure is called when the "current" character is
975 * deleted: it synthesizes a "leave" event for the character.
976 *
977 * Results:
978 * None.
979 *
980 * Side effects:
981 * A binding associated with one of the tags on the current
982 * character may be triggered.
983 *
984 *----------------------------------------------------------------------
985 */
986
987void
988TkTextUnpickCurrent(textPtr)
989 TkText *textPtr; /* Text widget information. */
990{
991 if (textPtr->flags & IN_CURRENT) {
992 XEvent event;
993
994 event = textPtr->pickEvent;
995 event.type = LeaveNotify;
996 TextDoEvent(textPtr, &event);
997 textPtr->flags &= ~IN_CURRENT;
998 }
999}
1000\f
1001/*
1002 *--------------------------------------------------------------
1003 *
1004 * TextDoEvent --
1005 *
1006 * This procedure is called to invoke binding processing
1007 * for a new event that is associated with the current character
1008 * for a text widget.
1009 *
1010 * Results:
1011 * None.
1012 *
1013 * Side effects:
1014 * Depends on the bindings for the text.
1015 *
1016 *--------------------------------------------------------------
1017 */
1018
1019static void
1020TextDoEvent(textPtr, eventPtr)
1021 TkText *textPtr; /* Text widget in which event
1022 * occurred. */
1023 XEvent *eventPtr; /* Real or simulated X event that
1024 * is to be processed. */
1025{
1026 TkTextTag **tagArrayPtr, **p1, **p2, *tmp;
1027 int numTags;
1028
1029 if (textPtr->bindingTable == NULL) {
1030 return;
1031 }
1032
1033 /*
1034 * Set up an array containing all of the tags that are associated
1035 * with the current character. This array will be used to look
1036 * for bindings. If there are no tags then there can't be any
1037 * bindings.
1038 */
1039
1040 tagArrayPtr = TkBTreeGetTags(textPtr->tree,
1041 textPtr->currentAnnotPtr->linePtr, textPtr->currentAnnotPtr->ch,
1042 &numTags);
1043 if (numTags == 0) {
1044 return;
1045 }
1046
1047 /*
1048 * Sort the array of tags. SortTags sorts it backwards, so after it
1049 * returns we have to reverse the order in the array.
1050 */
1051
1052 SortTags(numTags, tagArrayPtr);
1053 for (p1 = tagArrayPtr, p2 = tagArrayPtr + numTags - 1;
1054 p1 < p2; p1++, p2--) {
1055 tmp = *p1;
1056 *p1 = *p2;
1057 *p2 = tmp;
1058 }
1059
1060 /*
1061 * Invoke the binding system, then free up the tag array.
1062 */
1063
1064 Tk_BindEvent(textPtr->bindingTable, eventPtr, textPtr->tkwin,
1065 numTags, (ClientData *) tagArrayPtr);
1066 ckfree((char *) tagArrayPtr);
1067}
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