[RICHED20]
[reactos.git] / reactos / dll / win32 / riched20 / caret.c
1 /*
2 * RichEdit - Caret and selection functions.
3 *
4 * Copyright 2004 by Krzysztof Foltman
5 * Copyright 2005 by Phil Krylov
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 */
21
22
23 #include "editor.h"
24
25 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
26
27 void ME_SetCursorToStart(ME_TextEditor *editor, ME_Cursor *cursor)
28 {
29 cursor->pPara = editor->pBuffer->pFirst->member.para.next_para;
30 cursor->pRun = ME_FindItemFwd(cursor->pPara, diRun);
31 cursor->nOffset = 0;
32 }
33
34 static void ME_SetCursorToEnd(ME_TextEditor *editor, ME_Cursor *cursor)
35 {
36 cursor->pPara = editor->pBuffer->pLast->member.para.prev_para;
37 cursor->pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
38 cursor->nOffset = 0;
39 }
40
41
42 int ME_GetSelectionOfs(ME_TextEditor *editor, int *from, int *to)
43 {
44 *from = ME_GetCursorOfs(&editor->pCursors[0]);
45 *to = ME_GetCursorOfs(&editor->pCursors[1]);
46
47 if (*from > *to)
48 {
49 int tmp = *from;
50 *from = *to;
51 *to = tmp;
52 return 1;
53 }
54 return 0;
55 }
56
57 int ME_GetSelection(ME_TextEditor *editor, ME_Cursor **from, ME_Cursor **to)
58 {
59 int from_ofs = ME_GetCursorOfs( &editor->pCursors[0] );
60 int to_ofs = ME_GetCursorOfs( &editor->pCursors[1] );
61 BOOL swap = (from_ofs > to_ofs);
62
63 if (from_ofs == to_ofs)
64 {
65 /* If cursor[0] is at the beginning of a run and cursor[1] at the end
66 of the prev run then we need to swap. */
67 if (editor->pCursors[0].nOffset < editor->pCursors[1].nOffset)
68 swap = TRUE;
69 }
70
71 if (!swap)
72 {
73 *from = &editor->pCursors[0];
74 *to = &editor->pCursors[1];
75 return 0;
76 } else {
77 *from = &editor->pCursors[1];
78 *to = &editor->pCursors[0];
79 return 1;
80 }
81 }
82
83 int ME_GetTextLength(ME_TextEditor *editor)
84 {
85 ME_Cursor cursor;
86 ME_SetCursorToEnd(editor, &cursor);
87 return ME_GetCursorOfs(&cursor);
88 }
89
90
91 int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
92 {
93 int length;
94
95 if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
96 return E_INVALIDARG;
97 if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
98 return E_INVALIDARG;
99
100 length = ME_GetTextLength(editor);
101
102 if ((editor->styleFlags & ES_MULTILINE)
103 && (how->flags & GTL_USECRLF)
104 && !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
105 length += editor->nParagraphs - 1;
106
107 if (how->flags & GTL_NUMBYTES ||
108 (how->flags & GTL_PRECISE && /* GTL_PRECISE seems to imply GTL_NUMBYTES */
109 !(how->flags & GTL_NUMCHARS))) /* unless GTL_NUMCHARS is given */
110 {
111 CPINFO cpinfo;
112
113 if (how->codepage == 1200)
114 return length * 2;
115 if (how->flags & GTL_PRECISE)
116 FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
117 if (GetCPInfo(how->codepage, &cpinfo))
118 return length * cpinfo.MaxCharSize;
119 ERR("Invalid codepage %u\n", how->codepage);
120 return E_INVALIDARG;
121 }
122 return length;
123 }
124
125
126 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
127 {
128 int selectionEnd = 0;
129 const int len = ME_GetTextLength(editor);
130
131 /* all negative values are effectively the same */
132 if (from < 0)
133 from = -1;
134 if (to < 0)
135 to = -1;
136
137 /* select all */
138 if (from == 0 && to == -1)
139 {
140 ME_SetCursorToStart(editor, &editor->pCursors[1]);
141 ME_SetCursorToEnd(editor, &editor->pCursors[0]);
142 ME_InvalidateSelection(editor);
143 return len + 1;
144 }
145
146 /* if both values are equal and also out of bound, that means to */
147 /* put the selection at the end of the text */
148 if ((from == to) && (to < 0 || to > len))
149 {
150 selectionEnd = 1;
151 }
152 else
153 {
154 /* if from is negative and to is positive then selection is */
155 /* deselected and caret moved to end of the current selection */
156 if (from < 0)
157 {
158 int start, end;
159 ME_GetSelectionOfs(editor, &start, &end);
160 if (start != end)
161 {
162 editor->pCursors[1] = editor->pCursors[0];
163 ME_Repaint(editor);
164 }
165 return end;
166 }
167
168 /* adjust to if it's a negative value */
169 if (to < 0)
170 to = len + 1;
171
172 /* flip from and to if they are reversed */
173 if (from>to)
174 {
175 int tmp = from;
176 from = to;
177 to = tmp;
178 }
179
180 /* after fiddling with the values, we find from > len && to > len */
181 if (from > len)
182 selectionEnd = 1;
183 /* special case with to too big */
184 else if (to > len)
185 to = len + 1;
186 }
187
188 if (selectionEnd)
189 {
190 ME_SetCursorToEnd(editor, &editor->pCursors[0]);
191 editor->pCursors[1] = editor->pCursors[0];
192 ME_InvalidateSelection(editor);
193 return len;
194 }
195
196 ME_CursorFromCharOfs(editor, from, &editor->pCursors[1]);
197 editor->pCursors[0] = editor->pCursors[1];
198 ME_MoveCursorChars(editor, &editor->pCursors[0], to - from);
199 /* Selection is not allowed in the middle of an end paragraph run. */
200 if (editor->pCursors[1].pRun->member.run.nFlags & MERF_ENDPARA)
201 editor->pCursors[1].nOffset = 0;
202 if (editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA)
203 editor->pCursors[0].nOffset = 0;
204 return to;
205 }
206
207
208 static void
209 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
210 int *x, int *y, int *height)
211 {
212 ME_DisplayItem *row;
213 ME_DisplayItem *run = pCursor->pRun;
214 ME_DisplayItem *para = pCursor->pPara;
215 ME_DisplayItem *pSizeRun = run;
216 ME_Context c;
217 int run_x;
218
219 assert(height && x && y);
220 assert(~para->member.para.nFlags & MEPF_REWRAP);
221 assert(run && run->type == diRun);
222 assert(para && para->type == diParagraph);
223
224 row = ME_FindItemBack(run, diStartRowOrParagraph);
225 assert(row && row->type == diStartRow);
226
227 ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
228
229 if (!pCursor->nOffset)
230 {
231 ME_DisplayItem *prev = ME_FindItemBack(run, diRunOrParagraph);
232 assert(prev);
233 if (prev->type == diRun)
234 pSizeRun = prev;
235 }
236 if (editor->bCaretAtEnd && !pCursor->nOffset &&
237 run == ME_FindItemFwd(row, diRun))
238 {
239 ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
240 assert(tmp);
241 if (tmp->type == diRun)
242 {
243 row = ME_FindItemBack(tmp, diStartRow);
244 pSizeRun = run = tmp;
245 assert(run);
246 assert(run->type == diRun);
247 }
248 }
249 run_x = ME_PointFromCharContext( &c, &run->member.run, pCursor->nOffset, TRUE );
250
251 *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
252 *x = c.rcView.left + run->member.run.pt.x + run_x - editor->horz_si.nPos;
253 *y = c.rcView.top + para->member.para.pt.y + row->member.row.nBaseline
254 + run->member.run.pt.y - pSizeRun->member.run.nAscent
255 - editor->vert_si.nPos;
256 ME_DestroyContext(&c);
257 return;
258 }
259
260
261 void
262 ME_MoveCaret(ME_TextEditor *editor)
263 {
264 int x, y, height;
265
266 ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
267 if(editor->bHaveFocus && !ME_IsSelection(editor))
268 {
269 x = min(x, editor->rcFormat.right-1);
270 ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
271 ITextHost_TxSetCaretPos(editor->texthost, x, y);
272 }
273 }
274
275
276 void ME_ShowCaret(ME_TextEditor *ed)
277 {
278 ME_MoveCaret(ed);
279 if(ed->bHaveFocus && !ME_IsSelection(ed))
280 ITextHost_TxShowCaret(ed->texthost, TRUE);
281 }
282
283 void ME_HideCaret(ME_TextEditor *ed)
284 {
285 if(!ed->bHaveFocus || ME_IsSelection(ed))
286 {
287 ITextHost_TxShowCaret(ed->texthost, FALSE);
288 DestroyCaret();
289 }
290 }
291
292 BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
293 int nChars, BOOL bForce)
294 {
295 ME_Cursor c = *start;
296 int nOfs = ME_GetCursorOfs(start), text_len = ME_GetTextLength( editor );
297 int shift = 0;
298 int totalChars = nChars;
299 ME_DisplayItem *start_para;
300 BOOL delete_all = FALSE;
301
302 /* Prevent deletion past last end of paragraph run. */
303 nChars = min(nChars, text_len - nOfs);
304 if (nChars == text_len) delete_all = TRUE;
305 start_para = c.pPara;
306
307 if (!bForce)
308 {
309 ME_ProtectPartialTableDeletion(editor, &c, &nChars);
310 if (nChars == 0)
311 return FALSE;
312 }
313
314 while(nChars > 0)
315 {
316 ME_Run *run;
317 ME_CursorFromCharOfs(editor, nOfs+nChars, &c);
318 if (!c.nOffset &&
319 nOfs+nChars == (c.pRun->member.run.nCharOfs
320 + c.pPara->member.para.nCharOfs))
321 {
322 /* We aren't deleting anything in this run, so we will go back to the
323 * last run we are deleting text in. */
324 ME_PrevRun(&c.pPara, &c.pRun);
325 c.nOffset = c.pRun->member.run.len;
326 }
327 run = &c.pRun->member.run;
328 if (run->nFlags & MERF_ENDPARA) {
329 int eollen = c.pRun->member.run.len;
330 BOOL keepFirstParaFormat;
331
332 if (!ME_FindItemFwd(c.pRun, diParagraph))
333 {
334 return TRUE;
335 }
336 keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
337 run->nCharOfs);
338 if (!editor->bEmulateVersion10) /* v4.1 */
339 {
340 ME_DisplayItem *next_para = ME_FindItemFwd(c.pRun, diParagraphOrEnd);
341 ME_DisplayItem *this_para = next_para->member.para.prev_para;
342
343 /* The end of paragraph before a table row is only deleted if there
344 * is nothing else on the line before it. */
345 if (this_para == start_para &&
346 next_para->member.para.nFlags & MEPF_ROWSTART)
347 {
348 /* If the paragraph will be empty, then it should be deleted, however
349 * it still might have text right now which would inherit the
350 * MEPF_STARTROW property if we joined it right now.
351 * Instead we will delete it after the preceding text is deleted. */
352 if (nOfs > this_para->member.para.nCharOfs) {
353 /* Skip this end of line. */
354 nChars -= (eollen < nChars) ? eollen : nChars;
355 continue;
356 }
357 keepFirstParaFormat = TRUE;
358 }
359 }
360 ME_JoinParagraphs(editor, c.pPara, keepFirstParaFormat);
361 /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
362 ME_CheckCharOffsets(editor);
363 nChars -= (eollen < nChars) ? eollen : nChars;
364 continue;
365 }
366 else
367 {
368 ME_Cursor cursor;
369 int nCharsToDelete = min(nChars, c.nOffset);
370 int i;
371
372 c.nOffset -= nCharsToDelete;
373
374 ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
375
376 cursor = c;
377 /* nChars is the number of characters that should be deleted from the
378 PRECEDING runs (these BEFORE cursor.pRun)
379 nCharsToDelete is a number of chars to delete from THIS run */
380 nChars -= nCharsToDelete;
381 shift -= nCharsToDelete;
382 TRACE("Deleting %d (remaning %d) chars at %d in %s (%d)\n",
383 nCharsToDelete, nChars, c.nOffset,
384 debugstr_run( run ), run->len);
385
386 /* nOfs is a character offset (from the start of the document
387 to the current (deleted) run */
388 add_undo_insert_run( editor, nOfs + nChars, get_text( run, c.nOffset ), nCharsToDelete, run->nFlags, run->style );
389
390 ME_StrDeleteV(run->para->text, run->nCharOfs + c.nOffset, nCharsToDelete);
391 run->len -= nCharsToDelete;
392 TRACE("Post deletion string: %s (%d)\n", debugstr_run( run ), run->len);
393 TRACE("Shift value: %d\n", shift);
394
395 /* update cursors (including c) */
396 for (i=-1; i<editor->nCursors; i++) {
397 ME_Cursor *pThisCur = editor->pCursors + i;
398 if (i == -1) pThisCur = &c;
399 if (pThisCur->pRun == cursor.pRun) {
400 if (pThisCur->nOffset > cursor.nOffset) {
401 if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
402 pThisCur->nOffset = cursor.nOffset;
403 else
404 pThisCur->nOffset -= nCharsToDelete;
405 assert(pThisCur->nOffset >= 0);
406 assert(pThisCur->nOffset <= run->len);
407 }
408 if (pThisCur->nOffset == run->len)
409 {
410 pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
411 assert(pThisCur->pRun->type == diRun);
412 pThisCur->nOffset = 0;
413 }
414 }
415 }
416
417 /* c = updated data now */
418
419 if (c.pRun == cursor.pRun)
420 ME_SkipAndPropagateCharOffset(c.pRun, shift);
421 else
422 ME_PropagateCharOffset(c.pRun, shift);
423
424 if (!cursor.pRun->member.run.len)
425 {
426 TRACE("Removing empty run\n");
427 ME_Remove(cursor.pRun);
428 ME_DestroyDisplayItem(cursor.pRun);
429 }
430
431 shift = 0;
432 /*
433 ME_CheckCharOffsets(editor);
434 */
435 continue;
436 }
437 }
438 if (delete_all) ME_SetDefaultParaFormat( start_para->member.para.pFmt );
439 return TRUE;
440 }
441
442 BOOL ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, int nChars)
443 {
444 assert(nCursor>=0 && nCursor<editor->nCursors);
445 /* text operations set modified state */
446 editor->nModifyStep = 1;
447 return ME_InternalDeleteText(editor, &editor->pCursors[nCursor],
448 nChars, FALSE);
449 }
450
451 static ME_DisplayItem *
452 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
453 const WCHAR *str, int len, ME_Style *style,
454 int flags)
455 {
456 ME_Cursor *p = &editor->pCursors[nCursor];
457
458 editor->bCaretAtEnd = FALSE;
459
460 assert(p->pRun->type == diRun);
461
462 return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
463 }
464
465
466 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
467 {
468 ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
469 ME_DisplayItem *di;
470 WCHAR space = ' ';
471
472 /* FIXME no no no */
473 if (ME_IsSelection(editor))
474 ME_DeleteSelection(editor);
475
476 di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
477 MERF_GRAPHICS);
478 di->member.run.ole_obj = ALLOC_OBJ(*reo);
479 ME_CopyReObject(di->member.run.ole_obj, reo);
480 ME_ReleaseStyle(pStyle);
481 }
482
483
484 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
485 {
486 ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
487 WCHAR space = ' ';
488
489 /* FIXME no no no */
490 if (ME_IsSelection(editor))
491 ME_DeleteSelection(editor);
492
493 ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
494 MERF_ENDROW);
495 ME_ReleaseStyle(pStyle);
496 }
497
498
499 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
500 const WCHAR *str, int len, ME_Style *style)
501 {
502 const WCHAR *pos;
503 ME_Cursor *p = NULL;
504 int oldLen;
505
506 /* FIXME really HERE ? */
507 if (ME_IsSelection(editor))
508 ME_DeleteSelection(editor);
509
510 /* FIXME: is this too slow? */
511 /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
512 oldLen = ME_GetTextLength(editor);
513
514 /* text operations set modified state */
515 editor->nModifyStep = 1;
516
517 assert(style);
518
519 assert(nCursor>=0 && nCursor<editor->nCursors);
520 if (len == -1)
521 len = lstrlenW(str);
522
523 /* grow the text limit to fit our text */
524 if(editor->nTextLimit < oldLen +len)
525 editor->nTextLimit = oldLen + len;
526
527 pos = str;
528
529 while (len)
530 {
531 /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
532 while(pos - str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
533 pos++;
534
535 if (pos != str) { /* handle text */
536 ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
537 } else if (*pos == '\t') { /* handle tabs */
538 WCHAR tab = '\t';
539 ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
540 pos++;
541 } else { /* handle EOLs */
542 ME_DisplayItem *tp, *end_run, *run, *prev;
543 ME_Style *tmp_style;
544 int eol_len = 0;
545
546 /* Find number of CR and LF in end of paragraph run */
547 if (*pos =='\r')
548 {
549 if (len > 1 && pos[1] == '\n')
550 eol_len = 2;
551 else if (len > 2 && pos[1] == '\r' && pos[2] == '\n')
552 eol_len = 3;
553 else
554 eol_len = 1;
555 } else {
556 assert(*pos == '\n');
557 eol_len = 1;
558 }
559 pos += eol_len;
560
561 if (!editor->bEmulateVersion10 && eol_len == 3)
562 {
563 /* handle special \r\r\n sequence (richedit 2.x and higher only) */
564 WCHAR space = ' ';
565 ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
566 } else {
567 const WCHAR cr = '\r', *eol_str = str;
568
569 if (!editor->bEmulateVersion10)
570 {
571 eol_str = &cr;
572 eol_len = 1;
573 }
574
575 p = &editor->pCursors[nCursor];
576
577 if (p->nOffset == p->pRun->member.run.len)
578 {
579 run = ME_FindItemFwd( p->pRun, diRun );
580 if (!run) run = p->pRun;
581 }
582 else
583 {
584 if (p->nOffset) ME_SplitRunSimple(editor, p);
585 run = p->pRun;
586 }
587
588 tmp_style = ME_GetInsertStyle(editor, nCursor);
589 /* ME_SplitParagraph increases style refcount */
590 tp = ME_SplitParagraph(editor, run, run->member.run.style, eol_str, eol_len, 0);
591
592 end_run = ME_FindItemBack(tp, diRun);
593 ME_ReleaseStyle(end_run->member.run.style);
594 end_run->member.run.style = tmp_style;
595
596 /* Move any cursors that were at the end of the previous run to the beginning of the new para */
597 prev = ME_FindItemBack( end_run, diRun );
598 if (prev)
599 {
600 int i;
601 for (i = 0; i < editor->nCursors; i++)
602 {
603 if (editor->pCursors[i].pRun == prev &&
604 editor->pCursors[i].nOffset == prev->member.run.len)
605 {
606 editor->pCursors[i].pPara = tp;
607 editor->pCursors[i].pRun = run;
608 editor->pCursors[i].nOffset = 0;
609 }
610 }
611 }
612
613 }
614 }
615 len -= pos - str;
616 str = pos;
617 }
618 }
619
620 /* Move the cursor nRelOfs characters (either forwards or backwards)
621 *
622 * returns the actual number of characters moved.
623 **/
624 int ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
625 {
626 cursor->nOffset += nRelOfs;
627 if (cursor->nOffset < 0)
628 {
629 cursor->nOffset += cursor->pRun->member.run.nCharOfs;
630 if (cursor->nOffset >= 0)
631 {
632 /* new offset in the same paragraph */
633 do {
634 cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
635 } while (cursor->nOffset < cursor->pRun->member.run.nCharOfs);
636 cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
637 return nRelOfs;
638 }
639
640 cursor->nOffset += cursor->pPara->member.para.nCharOfs;
641 if (cursor->nOffset <= 0)
642 {
643 /* moved to the start of the text */
644 nRelOfs -= cursor->nOffset;
645 ME_SetCursorToStart(editor, cursor);
646 return nRelOfs;
647 }
648
649 /* new offset in a previous paragraph */
650 do {
651 cursor->pPara = cursor->pPara->member.para.prev_para;
652 } while (cursor->nOffset < cursor->pPara->member.para.nCharOfs);
653 cursor->nOffset -= cursor->pPara->member.para.nCharOfs;
654
655 cursor->pRun = ME_FindItemBack(cursor->pPara->member.para.next_para, diRun);
656 while (cursor->nOffset < cursor->pRun->member.run.nCharOfs) {
657 cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
658 }
659 cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
660 } else if (cursor->nOffset >= cursor->pRun->member.run.len) {
661 ME_DisplayItem *next_para;
662 int new_offset;
663
664 new_offset = ME_GetCursorOfs(cursor);
665 next_para = cursor->pPara->member.para.next_para;
666 if (new_offset < next_para->member.para.nCharOfs)
667 {
668 /* new offset in the same paragraph */
669 do {
670 cursor->nOffset -= cursor->pRun->member.run.len;
671 cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
672 } while (cursor->nOffset >= cursor->pRun->member.run.len);
673 return nRelOfs;
674 }
675
676 if (new_offset >= ME_GetTextLength(editor))
677 {
678 /* new offset at the end of the text */
679 ME_SetCursorToEnd(editor, cursor);
680 nRelOfs -= new_offset - ME_GetTextLength(editor);
681 return nRelOfs;
682 }
683
684 /* new offset in a following paragraph */
685 do {
686 cursor->pPara = next_para;
687 next_para = next_para->member.para.next_para;
688 } while (new_offset >= next_para->member.para.nCharOfs);
689
690 cursor->nOffset = new_offset - cursor->pPara->member.para.nCharOfs;
691 cursor->pRun = ME_FindItemFwd(cursor->pPara, diRun);
692 while (cursor->nOffset >= cursor->pRun->member.run.len)
693 {
694 cursor->nOffset -= cursor->pRun->member.run.len;
695 cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
696 }
697 } /* else new offset is in the same run */
698 return nRelOfs;
699 }
700
701
702 static BOOL
703 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
704 {
705 ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
706 ME_DisplayItem *pPara = cursor->pPara;
707 int nOffset = cursor->nOffset;
708
709 if (nRelOfs == -1)
710 {
711 /* Backward movement */
712 while (TRUE)
713 {
714 nOffset = ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
715 pRun->member.run.len, nOffset, WB_MOVEWORDLEFT);
716 if (nOffset)
717 break;
718 pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
719 if (pOtherRun->type == diRun)
720 {
721 if (ME_CallWordBreakProc(editor, get_text( &pOtherRun->member.run, 0 ),
722 pOtherRun->member.run.len,
723 pOtherRun->member.run.len - 1,
724 WB_ISDELIMITER)
725 && !(pRun->member.run.nFlags & MERF_ENDPARA)
726 && !(cursor->pRun == pRun && cursor->nOffset == 0)
727 && !ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
728 pRun->member.run.len, 0,
729 WB_ISDELIMITER))
730 break;
731 pRun = pOtherRun;
732 nOffset = pOtherRun->member.run.len;
733 }
734 else if (pOtherRun->type == diParagraph)
735 {
736 if (cursor->pRun == pRun && cursor->nOffset == 0)
737 {
738 pPara = pOtherRun;
739 /* Skip empty start of table row paragraph */
740 if (pPara->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
741 pPara = pPara->member.para.prev_para;
742 /* Paragraph breaks are treated as separate words */
743 if (pPara->member.para.prev_para->type == diTextStart)
744 return FALSE;
745
746 pRun = ME_FindItemBack(pPara, diRun);
747 pPara = pPara->member.para.prev_para;
748 }
749 break;
750 }
751 }
752 }
753 else
754 {
755 /* Forward movement */
756 BOOL last_delim = FALSE;
757
758 while (TRUE)
759 {
760 if (last_delim && !ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
761 pRun->member.run.len, nOffset, WB_ISDELIMITER))
762 break;
763 nOffset = ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
764 pRun->member.run.len, nOffset, WB_MOVEWORDRIGHT);
765 if (nOffset < pRun->member.run.len)
766 break;
767 pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
768 if (pOtherRun->type == diRun)
769 {
770 last_delim = ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
771 pRun->member.run.len, nOffset - 1, WB_ISDELIMITER);
772 pRun = pOtherRun;
773 nOffset = 0;
774 }
775 else if (pOtherRun->type == diParagraph)
776 {
777 if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
778 pOtherRun = pOtherRun->member.para.next_para;
779 if (cursor->pRun == pRun) {
780 pPara = pOtherRun;
781 pRun = ME_FindItemFwd(pPara, diRun);
782 }
783 nOffset = 0;
784 break;
785 }
786 else /* diTextEnd */
787 {
788 if (cursor->pRun == pRun)
789 return FALSE;
790 nOffset = 0;
791 break;
792 }
793 }
794 }
795 cursor->pPara = pPara;
796 cursor->pRun = pRun;
797 cursor->nOffset = nOffset;
798 return TRUE;
799 }
800
801
802 static void
803 ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
804 {
805 /* pCursor[0] is the end of the selection
806 * pCursor[1] is the start of the selection (or the position selection anchor)
807 * pCursor[2] and [3] are the selection anchors that are backed up
808 * so they are kept when the selection changes for drag selection.
809 */
810
811 editor->nSelectionType = selectionType;
812 switch(selectionType)
813 {
814 case stPosition:
815 break;
816 case stWord:
817 ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
818 editor->pCursors[1] = editor->pCursors[0];
819 ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
820 break;
821 case stLine:
822 case stParagraph:
823 {
824 ME_DisplayItem *pItem;
825 ME_DIType fwdSearchType, backSearchType;
826 if (selectionType == stParagraph) {
827 backSearchType = diParagraph;
828 fwdSearchType = diParagraphOrEnd;
829 } else {
830 backSearchType = diStartRow;
831 fwdSearchType = diStartRowOrParagraphOrEnd;
832 }
833 pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
834 assert(pItem);
835 if (pItem->type == diTextEnd)
836 editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
837 else
838 editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
839 editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
840 editor->pCursors[0].nOffset = 0;
841
842 pItem = ME_FindItemBack(pItem, backSearchType);
843 editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
844 editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
845 editor->pCursors[1].nOffset = 0;
846 break;
847 }
848 case stDocument:
849 /* Select everything with cursor anchored from the start of the text */
850 editor->nSelectionType = stDocument;
851 ME_SetCursorToStart(editor, &editor->pCursors[1]);
852 ME_SetCursorToEnd(editor, &editor->pCursors[0]);
853 break;
854 default: assert(0);
855 }
856 /* Store the anchor positions for extending the selection. */
857 editor->pCursors[2] = editor->pCursors[0];
858 editor->pCursors[3] = editor->pCursors[1];
859 }
860
861 int ME_GetCursorOfs(const ME_Cursor *cursor)
862 {
863 return cursor->pPara->member.para.nCharOfs
864 + cursor->pRun->member.run.nCharOfs + cursor->nOffset;
865 }
866
867 /* Helper function for ME_FindPixelPos to find paragraph within tables */
868 static ME_DisplayItem* ME_FindPixelPosInTableRow(int x, int y,
869 ME_DisplayItem *para)
870 {
871 ME_DisplayItem *cell, *next_cell;
872 assert(para->member.para.nFlags & MEPF_ROWSTART);
873 cell = para->member.para.next_para->member.para.pCell;
874 assert(cell);
875
876 /* find the cell we are in */
877 while ((next_cell = cell->member.cell.next_cell) != NULL) {
878 if (x < next_cell->member.cell.pt.x)
879 {
880 para = ME_FindItemFwd(cell, diParagraph);
881 /* Found the cell, but there might be multiple paragraphs in
882 * the cell, so need to search down the cell for the paragraph. */
883 while (cell == para->member.para.pCell) {
884 if (y < para->member.para.pt.y + para->member.para.nHeight)
885 {
886 if (para->member.para.nFlags & MEPF_ROWSTART)
887 return ME_FindPixelPosInTableRow(x, y, para);
888 else
889 return para;
890 }
891 para = para->member.para.next_para;
892 }
893 /* Past the end of the cell, so go back to the last cell paragraph */
894 return para->member.para.prev_para;
895 }
896 cell = next_cell;
897 }
898 /* Return table row delimiter */
899 para = ME_FindItemFwd(cell, diParagraph);
900 assert(para->member.para.nFlags & MEPF_ROWEND);
901 assert(para->member.para.pFmt->dwMask & PFM_TABLEROWDELIMITER);
902 assert(para->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER);
903 return para;
904 }
905
906 static BOOL ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
907 int x, ME_Cursor *cursor, BOOL *pbCaretAtEnd)
908 {
909 ME_DisplayItem *pNext, *pLastRun;
910 ME_Row *row = &pRow->member.row;
911 BOOL exact = TRUE;
912
913 if (x < row->pt.x)
914 {
915 x = row->pt.x;
916 exact = FALSE;
917 }
918 pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
919 assert(pNext->type == diRun);
920 if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
921 cursor->nOffset = 0;
922 do {
923 int run_x = pNext->member.run.pt.x;
924 int width = pNext->member.run.nWidth;
925
926 if (x >= run_x && x < run_x+width)
927 {
928 cursor->nOffset = ME_CharFromPoint(editor, x-run_x, &pNext->member.run, TRUE, TRUE);
929 cursor->pRun = pNext;
930 cursor->pPara = ME_GetParagraph( cursor->pRun );
931 return exact;
932 }
933 pLastRun = pNext;
934 pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
935 } while(pNext && pNext->type == diRun);
936
937 if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
938 {
939 cursor->pRun = ME_FindItemFwd(pNext, diRun);
940 if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
941 }
942 else
943 cursor->pRun = pLastRun;
944
945 cursor->pPara = ME_GetParagraph( cursor->pRun );
946 return FALSE;
947 }
948
949 /* Finds the run and offset from the pixel position.
950 *
951 * x & y are pixel positions in virtual coordinates into the rich edit control,
952 * so client coordinates must first be adjusted by the scroll position.
953 *
954 * returns TRUE if the result was exactly under the cursor, otherwise returns
955 * FALSE, and result is set to the closest position to the coordinates.
956 */
957 static BOOL ME_FindPixelPos(ME_TextEditor *editor, int x, int y,
958 ME_Cursor *result, BOOL *is_eol)
959 {
960 ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
961 BOOL isExact = TRUE;
962
963 x -= editor->rcFormat.left;
964 y -= editor->rcFormat.top;
965
966 if (is_eol)
967 *is_eol = FALSE;
968
969 /* find paragraph */
970 for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
971 {
972 assert(p->type == diParagraph);
973 if (y < p->member.para.pt.y + p->member.para.nHeight)
974 {
975 if (p->member.para.nFlags & MEPF_ROWSTART)
976 p = ME_FindPixelPosInTableRow(x, y, p);
977 y -= p->member.para.pt.y;
978 p = ME_FindItemFwd(p, diStartRow);
979 break;
980 } else if (p->member.para.nFlags & MEPF_ROWSTART) {
981 p = ME_GetTableRowEnd(p);
982 }
983 }
984 /* find row */
985 for (; p != editor->pBuffer->pLast; )
986 {
987 ME_DisplayItem *pp;
988 assert(p->type == diStartRow);
989 if (y < p->member.row.pt.y + p->member.row.nHeight) break;
990 pp = ME_FindItemFwd(p, diStartRow);
991 if (!pp) break;
992 p = pp;
993 }
994 if (p == editor->pBuffer->pLast)
995 {
996 /* The position is below the last paragraph, so the last row will be used
997 * rather than the end of the text, so the x position will be used to
998 * determine the offset closest to the pixel position. */
999 isExact = FALSE;
1000 p = ME_FindItemBack(p, diStartRow);
1001 if (!p) p = editor->pBuffer->pLast;
1002 }
1003
1004 assert( p->type == diStartRow || p == editor->pBuffer->pLast );
1005
1006 if( p->type == diStartRow )
1007 return ME_FindRunInRow( editor, p, x, result, is_eol ) && isExact;
1008
1009 result->pRun = ME_FindItemBack(p, diRun);
1010 result->pPara = ME_GetParagraph(result->pRun);
1011 result->nOffset = 0;
1012 assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
1013 return FALSE;
1014 }
1015
1016
1017 /* Sets the cursor to the position closest to the pixel position
1018 *
1019 * x & y are pixel positions in client coordinates.
1020 *
1021 * isExact will be set to TRUE if the run is directly under the pixel
1022 * position, FALSE if it not, unless isExact is set to NULL.
1023 *
1024 * return FALSE if outside client area and the cursor is not set,
1025 * otherwise TRUE is returned.
1026 */
1027 BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y,
1028 ME_Cursor *cursor, BOOL *isExact)
1029 {
1030 RECT rc;
1031 BOOL bResult;
1032
1033 ITextHost_TxGetClientRect(editor->texthost, &rc);
1034 if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
1035 if (isExact) *isExact = FALSE;
1036 return FALSE;
1037 }
1038 x += editor->horz_si.nPos;
1039 y += editor->vert_si.nPos;
1040 bResult = ME_FindPixelPos(editor, x, y, cursor, NULL);
1041 if (isExact) *isExact = bResult;
1042 return TRUE;
1043 }
1044
1045
1046
1047 /* Extends the selection with a word, line, or paragraph selection type.
1048 *
1049 * The selection is anchored by editor->pCursors[2-3] such that the text
1050 * between the anchors will remain selected, and one end will be extended.
1051 *
1052 * editor->pCursors[0] should have the position to extend the selection to
1053 * before this function is called.
1054 *
1055 * Nothing will be done if editor->nSelectionType equals stPosition.
1056 */
1057 static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
1058 {
1059 ME_Cursor tmp_cursor;
1060 int curOfs, anchorStartOfs, anchorEndOfs;
1061 if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
1062 return;
1063 curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
1064 anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
1065 anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
1066
1067 tmp_cursor = editor->pCursors[0];
1068 editor->pCursors[0] = editor->pCursors[2];
1069 editor->pCursors[1] = editor->pCursors[3];
1070 if (curOfs < anchorStartOfs)
1071 {
1072 /* Extend the left side of selection */
1073 editor->pCursors[1] = tmp_cursor;
1074 if (editor->nSelectionType == stWord)
1075 ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
1076 else
1077 {
1078 ME_DisplayItem *pItem;
1079 ME_DIType searchType = ((editor->nSelectionType == stLine) ?
1080 diStartRowOrParagraph:diParagraph);
1081 pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
1082 editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
1083 editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
1084 editor->pCursors[1].nOffset = 0;
1085 }
1086 }
1087 else if (curOfs >= anchorEndOfs)
1088 {
1089 /* Extend the right side of selection */
1090 editor->pCursors[0] = tmp_cursor;
1091 if (editor->nSelectionType == stWord)
1092 ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
1093 else
1094 {
1095 ME_DisplayItem *pItem;
1096 ME_DIType searchType = ((editor->nSelectionType == stLine) ?
1097 diStartRowOrParagraphOrEnd:diParagraphOrEnd);
1098 pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
1099 if (pItem->type == diTextEnd)
1100 editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
1101 else
1102 editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
1103 editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
1104 editor->pCursors[0].nOffset = 0;
1105 }
1106 }
1107 }
1108
1109 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1110 {
1111 ME_Cursor tmp_cursor;
1112 BOOL is_selection = FALSE, is_shift;
1113
1114 editor->nUDArrowX = -1;
1115
1116 x += editor->horz_si.nPos;
1117 y += editor->vert_si.nPos;
1118
1119 tmp_cursor = editor->pCursors[0];
1120 is_selection = ME_IsSelection(editor);
1121 is_shift = GetKeyState(VK_SHIFT) < 0;
1122
1123 ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
1124
1125 if (x >= editor->rcFormat.left || is_shift)
1126 {
1127 if (clickNum > 1)
1128 {
1129 editor->pCursors[1] = editor->pCursors[0];
1130 if (is_shift) {
1131 if (x >= editor->rcFormat.left)
1132 ME_SelectByType(editor, stWord);
1133 else
1134 ME_SelectByType(editor, stParagraph);
1135 } else if (clickNum % 2 == 0) {
1136 ME_SelectByType(editor, stWord);
1137 } else {
1138 ME_SelectByType(editor, stParagraph);
1139 }
1140 }
1141 else if (!is_shift)
1142 {
1143 editor->nSelectionType = stPosition;
1144 editor->pCursors[1] = editor->pCursors[0];
1145 }
1146 else if (!is_selection)
1147 {
1148 editor->nSelectionType = stPosition;
1149 editor->pCursors[1] = tmp_cursor;
1150 }
1151 else if (editor->nSelectionType != stPosition)
1152 {
1153 ME_ExtendAnchorSelection(editor);
1154 }
1155 }
1156 else
1157 {
1158 if (clickNum < 2) {
1159 ME_SelectByType(editor, stLine);
1160 } else if (clickNum % 2 == 0 || is_shift) {
1161 ME_SelectByType(editor, stParagraph);
1162 } else {
1163 ME_SelectByType(editor, stDocument);
1164 }
1165 }
1166 ME_InvalidateSelection(editor);
1167 ITextHost_TxShowCaret(editor->texthost, FALSE);
1168 ME_ShowCaret(editor);
1169 ME_SendSelChange(editor);
1170 }
1171
1172 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
1173 {
1174 ME_Cursor tmp_cursor;
1175
1176 if (editor->nSelectionType == stDocument)
1177 return;
1178 x += editor->horz_si.nPos;
1179 y += editor->vert_si.nPos;
1180
1181 tmp_cursor = editor->pCursors[0];
1182 /* FIXME: do something with the return value of ME_FindPixelPos */
1183 ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1184
1185 ME_InvalidateSelection(editor);
1186 editor->pCursors[0] = tmp_cursor;
1187 ME_ExtendAnchorSelection(editor);
1188
1189 if (editor->nSelectionType != stPosition &&
1190 memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1191 {
1192 /* The scroll the cursor towards the other end, since it was the one
1193 * extended by ME_ExtendAnchorSelection */
1194 ME_EnsureVisible(editor, &editor->pCursors[1]);
1195 } else {
1196 ME_EnsureVisible(editor, &editor->pCursors[0]);
1197 }
1198
1199 ME_InvalidateSelection(editor);
1200 ITextHost_TxShowCaret(editor->texthost, FALSE);
1201 ME_ShowCaret(editor);
1202 ME_SendSelChange(editor);
1203 }
1204
1205 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1206 {
1207 ME_DisplayItem *pRun = pCursor->pRun;
1208 int x;
1209
1210 if (editor->nUDArrowX != -1)
1211 x = editor->nUDArrowX;
1212 else {
1213 if (editor->bCaretAtEnd)
1214 {
1215 pRun = ME_FindItemBack(pRun, diRun);
1216 assert(pRun);
1217 x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1218 }
1219 else {
1220 x = pRun->member.run.pt.x;
1221 x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset, TRUE);
1222 }
1223 editor->nUDArrowX = x;
1224 }
1225 return x;
1226 }
1227
1228
1229 static void
1230 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1231 {
1232 ME_DisplayItem *pRun = pCursor->pRun;
1233 ME_DisplayItem *pOldPara = pCursor->pPara;
1234 ME_DisplayItem *pItem, *pNewPara;
1235 int x = ME_GetXForArrow(editor, pCursor);
1236
1237 if (editor->bCaretAtEnd && !pCursor->nOffset)
1238 if (!ME_PrevRun(&pOldPara, &pRun))
1239 return;
1240
1241 if (nRelOfs == -1)
1242 {
1243 /* start of this row */
1244 pItem = ME_FindItemBack(pRun, diStartRow);
1245 assert(pItem);
1246 /* start of the previous row */
1247 pItem = ME_FindItemBack(pItem, diStartRow);
1248 if (!pItem)
1249 return; /* row not found - ignore */
1250 pNewPara = ME_GetParagraph(pItem);
1251 if (pOldPara->member.para.nFlags & MEPF_ROWEND ||
1252 (pOldPara->member.para.pCell &&
1253 pOldPara->member.para.pCell != pNewPara->member.para.pCell))
1254 {
1255 /* Brought out of a cell */
1256 pNewPara = ME_GetTableRowStart(pOldPara)->member.para.prev_para;
1257 if (pNewPara->type == diTextStart)
1258 return; /* At the top, so don't go anywhere. */
1259 pItem = ME_FindItemFwd(pNewPara, diStartRow);
1260 }
1261 if (pNewPara->member.para.nFlags & MEPF_ROWEND)
1262 {
1263 /* Brought into a table row */
1264 ME_Cell *cell = &ME_FindItemBack(pNewPara, diCell)->member.cell;
1265 while (x < cell->pt.x && cell->prev_cell)
1266 cell = &cell->prev_cell->member.cell;
1267 if (cell->next_cell) /* else - we are still at the end of the row */
1268 pItem = ME_FindItemBack(cell->next_cell, diStartRow);
1269 }
1270 }
1271 else
1272 {
1273 /* start of the next row */
1274 pItem = ME_FindItemFwd(pRun, diStartRow);
1275 if (!pItem)
1276 return; /* row not found - ignore */
1277 pNewPara = ME_GetParagraph(pItem);
1278 if (pOldPara->member.para.nFlags & MEPF_ROWSTART ||
1279 (pOldPara->member.para.pCell &&
1280 pOldPara->member.para.pCell != pNewPara->member.para.pCell))
1281 {
1282 /* Brought out of a cell */
1283 pNewPara = ME_GetTableRowEnd(pOldPara)->member.para.next_para;
1284 if (pNewPara->type == diTextEnd)
1285 return; /* At the bottom, so don't go anywhere. */
1286 pItem = ME_FindItemFwd(pNewPara, diStartRow);
1287 }
1288 if (pNewPara->member.para.nFlags & MEPF_ROWSTART)
1289 {
1290 /* Brought into a table row */
1291 ME_DisplayItem *cell = ME_FindItemFwd(pNewPara, diCell);
1292 while (cell->member.cell.next_cell &&
1293 x >= cell->member.cell.next_cell->member.cell.pt.x)
1294 cell = cell->member.cell.next_cell;
1295 pItem = ME_FindItemFwd(cell, diStartRow);
1296 }
1297 }
1298 if (!pItem)
1299 {
1300 /* row not found - ignore */
1301 return;
1302 }
1303 ME_FindRunInRow(editor, pItem, x, pCursor, &editor->bCaretAtEnd);
1304 assert(pCursor->pRun);
1305 assert(pCursor->pRun->type == diRun);
1306 }
1307
1308 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1309 {
1310 ME_DisplayItem *p = ME_FindItemFwd(editor->pBuffer->pFirst, diStartRow);
1311
1312 if (editor->vert_si.nPos < p->member.row.nHeight)
1313 {
1314 ME_SetCursorToStart(editor, pCursor);
1315 editor->bCaretAtEnd = FALSE;
1316 /* Native clears seems to clear this x value on page up at the top
1317 * of the text, but not on page down at the end of the text.
1318 * Doesn't make sense, but we try to be bug for bug compatible. */
1319 editor->nUDArrowX = -1;
1320 } else {
1321 ME_DisplayItem *pRun = pCursor->pRun;
1322 ME_DisplayItem *pLast;
1323 int x, y, yd, yp;
1324 int yOldScrollPos = editor->vert_si.nPos;
1325
1326 x = ME_GetXForArrow(editor, pCursor);
1327 if (!pCursor->nOffset && editor->bCaretAtEnd)
1328 pRun = ME_FindItemBack(pRun, diRun);
1329
1330 p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1331 assert(p->type == diStartRow);
1332 yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1333 y = yp + p->member.row.pt.y;
1334
1335 ME_ScrollUp(editor, editor->sizeWindow.cy);
1336 /* Only move the cursor by the amount scrolled. */
1337 yd = y + editor->vert_si.nPos - yOldScrollPos;
1338 pLast = p;
1339
1340 do {
1341 p = ME_FindItemBack(p, diStartRowOrParagraph);
1342 if (!p)
1343 break;
1344 if (p->type == diParagraph) { /* crossing paragraphs */
1345 if (p->member.para.prev_para == NULL)
1346 break;
1347 yp = p->member.para.prev_para->member.para.pt.y;
1348 continue;
1349 }
1350 y = yp + p->member.row.pt.y;
1351 if (y < yd)
1352 break;
1353 pLast = p;
1354 } while(1);
1355
1356 ME_FindRunInRow(editor, pLast, x, pCursor, &editor->bCaretAtEnd);
1357 }
1358 assert(pCursor->pRun);
1359 assert(pCursor->pRun->type == diRun);
1360 }
1361
1362 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1363 {
1364 ME_DisplayItem *pLast;
1365 int x, y;
1366
1367 /* Find y position of the last row */
1368 pLast = editor->pBuffer->pLast;
1369 y = pLast->member.para.prev_para->member.para.pt.y
1370 + ME_FindItemBack(pLast, diStartRow)->member.row.pt.y;
1371
1372 x = ME_GetXForArrow(editor, pCursor);
1373
1374 if (editor->vert_si.nPos >= y - editor->sizeWindow.cy)
1375 {
1376 ME_SetCursorToEnd(editor, pCursor);
1377 editor->bCaretAtEnd = FALSE;
1378 } else {
1379 ME_DisplayItem *pRun = pCursor->pRun;
1380 ME_DisplayItem *p;
1381 int yd, yp;
1382 int yOldScrollPos = editor->vert_si.nPos;
1383
1384 if (!pCursor->nOffset && editor->bCaretAtEnd)
1385 pRun = ME_FindItemBack(pRun, diRun);
1386
1387 p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1388 assert(p->type == diStartRow);
1389 yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1390 y = yp + p->member.row.pt.y;
1391
1392 /* For native richedit controls:
1393 * v1.0 - v3.1 can only scroll down as far as the scrollbar lets us
1394 * v4.1 can scroll past this position here. */
1395 ME_ScrollDown(editor, editor->sizeWindow.cy);
1396 /* Only move the cursor by the amount scrolled. */
1397 yd = y + editor->vert_si.nPos - yOldScrollPos;
1398 pLast = p;
1399
1400 do {
1401 p = ME_FindItemFwd(p, diStartRowOrParagraph);
1402 if (!p)
1403 break;
1404 if (p->type == diParagraph) {
1405 yp = p->member.para.pt.y;
1406 continue;
1407 }
1408 y = yp + p->member.row.pt.y;
1409 if (y >= yd)
1410 break;
1411 pLast = p;
1412 } while(1);
1413
1414 ME_FindRunInRow(editor, pLast, x, pCursor, &editor->bCaretAtEnd);
1415 }
1416 assert(pCursor->pRun);
1417 assert(pCursor->pRun->type == diRun);
1418 }
1419
1420 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1421 {
1422 ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1423 if (pRow) {
1424 ME_DisplayItem *pRun;
1425 if (editor->bCaretAtEnd && !pCursor->nOffset) {
1426 pRow = ME_FindItemBack(pRow, diStartRow);
1427 if (!pRow)
1428 return;
1429 }
1430 pRun = ME_FindItemFwd(pRow, diRun);
1431 if (pRun) {
1432 pCursor->pRun = pRun;
1433 assert(pCursor->pPara == ME_GetParagraph(pRun));
1434 pCursor->nOffset = 0;
1435 }
1436 }
1437 editor->bCaretAtEnd = FALSE;
1438 }
1439
1440 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1441 {
1442 ME_SetCursorToStart(editor, pCursor);
1443 editor->bCaretAtEnd = FALSE;
1444 }
1445
1446 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1447 {
1448 ME_DisplayItem *pRow;
1449
1450 if (editor->bCaretAtEnd && !pCursor->nOffset)
1451 return;
1452
1453 pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1454 assert(pRow);
1455 if (pRow->type == diStartRow) {
1456 ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1457 assert(pRun);
1458 pCursor->pRun = pRun;
1459 assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1460 pCursor->nOffset = 0;
1461 editor->bCaretAtEnd = TRUE;
1462 return;
1463 }
1464 pCursor->pRun = ME_FindItemBack(pRow, diRun);
1465 assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1466 assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1467 pCursor->nOffset = 0;
1468 editor->bCaretAtEnd = FALSE;
1469 }
1470
1471 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1472 {
1473 ME_SetCursorToEnd(editor, pCursor);
1474 editor->bCaretAtEnd = FALSE;
1475 }
1476
1477 BOOL ME_IsSelection(ME_TextEditor *editor)
1478 {
1479 return editor->pCursors[0].pRun != editor->pCursors[1].pRun ||
1480 editor->pCursors[0].nOffset != editor->pCursors[1].nOffset;
1481 }
1482
1483 void ME_DeleteSelection(ME_TextEditor *editor)
1484 {
1485 int from, to;
1486 int nStartCursor = ME_GetSelectionOfs(editor, &from, &to);
1487 int nEndCursor = nStartCursor ^ 1;
1488 ME_DeleteTextAtCursor(editor, nStartCursor, to - from);
1489 editor->pCursors[nEndCursor] = editor->pCursors[nStartCursor];
1490 }
1491
1492 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1493 {
1494 return ME_GetInsertStyle(editor, 0);
1495 }
1496
1497 void ME_SendSelChange(ME_TextEditor *editor)
1498 {
1499 SELCHANGE sc;
1500
1501 if (!(editor->nEventMask & ENM_SELCHANGE))
1502 return;
1503
1504 sc.nmhdr.hwndFrom = NULL;
1505 sc.nmhdr.idFrom = 0;
1506 sc.nmhdr.code = EN_SELCHANGE;
1507 ME_GetSelectionOfs(editor, &sc.chrg.cpMin, &sc.chrg.cpMax);
1508 sc.seltyp = SEL_EMPTY;
1509 if (sc.chrg.cpMin != sc.chrg.cpMax)
1510 sc.seltyp |= SEL_TEXT;
1511 if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* what were RICHEDIT authors thinking ? */
1512 sc.seltyp |= SEL_MULTICHAR;
1513 TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1514 sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1515 (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1516 (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1517 if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1518 {
1519 ME_ClearTempStyle(editor);
1520
1521 editor->notified_cr = sc.chrg;
1522 ITextHost_TxNotify(editor->texthost, sc.nmhdr.code, &sc);
1523 }
1524 }
1525
1526 BOOL
1527 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1528 {
1529 int nCursor = 0;
1530 ME_Cursor *p = &editor->pCursors[nCursor];
1531 ME_Cursor tmp_curs = *p;
1532 BOOL success = FALSE;
1533
1534 ME_CheckCharOffsets(editor);
1535 switch(nVKey) {
1536 case VK_LEFT:
1537 editor->bCaretAtEnd = FALSE;
1538 if (ctrl)
1539 success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1540 else
1541 success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1542 break;
1543 case VK_RIGHT:
1544 editor->bCaretAtEnd = FALSE;
1545 if (ctrl)
1546 success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1547 else
1548 success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1549 break;
1550 case VK_UP:
1551 ME_MoveCursorLines(editor, &tmp_curs, -1);
1552 break;
1553 case VK_DOWN:
1554 ME_MoveCursorLines(editor, &tmp_curs, +1);
1555 break;
1556 case VK_PRIOR:
1557 ME_ArrowPageUp(editor, &tmp_curs);
1558 break;
1559 case VK_NEXT:
1560 ME_ArrowPageDown(editor, &tmp_curs);
1561 break;
1562 case VK_HOME: {
1563 if (ctrl)
1564 ME_ArrowCtrlHome(editor, &tmp_curs);
1565 else
1566 ME_ArrowHome(editor, &tmp_curs);
1567 editor->bCaretAtEnd = FALSE;
1568 break;
1569 }
1570 case VK_END:
1571 if (ctrl)
1572 ME_ArrowCtrlEnd(editor, &tmp_curs);
1573 else
1574 ME_ArrowEnd(editor, &tmp_curs);
1575 break;
1576 }
1577
1578 if (!extend)
1579 editor->pCursors[1] = tmp_curs;
1580 *p = tmp_curs;
1581
1582 ME_InvalidateSelection(editor);
1583 ME_Repaint(editor);
1584 ITextHost_TxShowCaret(editor->texthost, FALSE);
1585 ME_EnsureVisible(editor, &tmp_curs);
1586 ME_ShowCaret(editor);
1587 ME_SendSelChange(editor);
1588 return success;
1589 }