d676a1bc38b9468bd824e9832869167909050ffd
[reactos.git] / 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, BOOL final_eop)
35 {
36 cursor->pPara = editor->pBuffer->pLast->member.para.prev_para;
37 cursor->pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
38 cursor->nOffset = final_eop ? cursor->pRun->member.run.len : 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, FALSE);
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], TRUE);
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 if (end > len)
163 {
164 editor->pCursors[0].nOffset = 0;
165 end --;
166 }
167 editor->pCursors[1] = editor->pCursors[0];
168 ME_Repaint(editor);
169 }
170 return end;
171 }
172
173 /* adjust to if it's a negative value */
174 if (to < 0)
175 to = len + 1;
176
177 /* flip from and to if they are reversed */
178 if (from>to)
179 {
180 int tmp = from;
181 from = to;
182 to = tmp;
183 }
184
185 /* after fiddling with the values, we find from > len && to > len */
186 if (from > len)
187 selectionEnd = 1;
188 /* special case with to too big */
189 else if (to > len)
190 to = len + 1;
191 }
192
193 if (selectionEnd)
194 {
195 ME_SetCursorToEnd(editor, &editor->pCursors[0], FALSE);
196 editor->pCursors[1] = editor->pCursors[0];
197 ME_InvalidateSelection(editor);
198 return len;
199 }
200
201 ME_CursorFromCharOfs(editor, from, &editor->pCursors[1]);
202 editor->pCursors[0] = editor->pCursors[1];
203 ME_MoveCursorChars(editor, &editor->pCursors[0], to - from, FALSE);
204 /* Selection is not allowed in the middle of an end paragraph run. */
205 if (editor->pCursors[1].pRun->member.run.nFlags & MERF_ENDPARA)
206 editor->pCursors[1].nOffset = 0;
207 if (editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA)
208 {
209 if (to > len)
210 editor->pCursors[0].nOffset = editor->pCursors[0].pRun->member.run.len;
211 else
212 editor->pCursors[0].nOffset = 0;
213 }
214 return to;
215 }
216
217
218 void ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
219 int *x, int *y, int *height)
220 {
221 ME_DisplayItem *row;
222 ME_DisplayItem *run = pCursor->pRun;
223 ME_DisplayItem *para = pCursor->pPara;
224 ME_DisplayItem *pSizeRun = run;
225 ME_Context c;
226 int run_x;
227
228 assert(height && x && y);
229 assert(~para->member.para.nFlags & MEPF_REWRAP);
230 assert(run && run->type == diRun);
231 assert(para && para->type == diParagraph);
232
233 row = ME_FindItemBack(run, diStartRowOrParagraph);
234 assert(row && row->type == diStartRow);
235
236 ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
237
238 if (!pCursor->nOffset)
239 {
240 ME_DisplayItem *prev = ME_FindItemBack(run, diRunOrParagraph);
241 assert(prev);
242 if (prev->type == diRun)
243 pSizeRun = prev;
244 }
245 if (editor->bCaretAtEnd && !pCursor->nOffset &&
246 run == ME_FindItemFwd(row, diRun))
247 {
248 ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
249 assert(tmp);
250 if (tmp->type == diRun)
251 {
252 row = ME_FindItemBack(tmp, diStartRow);
253 pSizeRun = run = tmp;
254 assert(run);
255 assert(run->type == diRun);
256 }
257 }
258 run_x = ME_PointFromCharContext( &c, &run->member.run, pCursor->nOffset, TRUE );
259
260 *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
261 *x = c.rcView.left + run->member.run.pt.x + run_x - editor->horz_si.nPos;
262 *y = c.rcView.top + para->member.para.pt.y + row->member.row.nBaseline
263 + run->member.run.pt.y - pSizeRun->member.run.nAscent
264 - editor->vert_si.nPos;
265 ME_DestroyContext(&c);
266 return;
267 }
268
269
270 void
271 ME_MoveCaret(ME_TextEditor *editor)
272 {
273 int x, y, height;
274
275 ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
276 if(editor->bHaveFocus && !ME_IsSelection(editor))
277 {
278 x = min(x, editor->rcFormat.right-1);
279 ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
280 ITextHost_TxSetCaretPos(editor->texthost, x, y);
281 }
282 }
283
284
285 void ME_ShowCaret(ME_TextEditor *ed)
286 {
287 ME_MoveCaret(ed);
288 if(ed->bHaveFocus && !ME_IsSelection(ed))
289 ITextHost_TxShowCaret(ed->texthost, TRUE);
290 }
291
292 void ME_HideCaret(ME_TextEditor *ed)
293 {
294 if(!ed->bHaveFocus || ME_IsSelection(ed))
295 {
296 ITextHost_TxShowCaret(ed->texthost, FALSE);
297 DestroyCaret();
298 }
299 }
300
301 BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
302 int nChars, BOOL bForce)
303 {
304 ME_Cursor c = *start;
305 int nOfs = ME_GetCursorOfs(start), text_len = ME_GetTextLength( editor );
306 int shift = 0;
307 int totalChars = nChars;
308 ME_DisplayItem *start_para;
309 BOOL delete_all = FALSE;
310
311 /* Prevent deletion past last end of paragraph run. */
312 nChars = min(nChars, text_len - nOfs);
313 if (nChars == text_len) delete_all = TRUE;
314 start_para = c.pPara;
315
316 if (!bForce)
317 {
318 ME_ProtectPartialTableDeletion(editor, &c, &nChars);
319 if (nChars == 0)
320 return FALSE;
321 }
322
323 while(nChars > 0)
324 {
325 ME_Run *run;
326 ME_CursorFromCharOfs(editor, nOfs+nChars, &c);
327 if (!c.nOffset &&
328 nOfs+nChars == (c.pRun->member.run.nCharOfs
329 + c.pPara->member.para.nCharOfs))
330 {
331 /* We aren't deleting anything in this run, so we will go back to the
332 * last run we are deleting text in. */
333 ME_PrevRun(&c.pPara, &c.pRun, TRUE);
334 c.nOffset = c.pRun->member.run.len;
335 }
336 run = &c.pRun->member.run;
337 if (run->nFlags & MERF_ENDPARA) {
338 int eollen = c.pRun->member.run.len;
339 BOOL keepFirstParaFormat;
340
341 if (!ME_FindItemFwd(c.pRun, diParagraph))
342 {
343 return TRUE;
344 }
345 keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
346 run->nCharOfs);
347 if (!editor->bEmulateVersion10) /* v4.1 */
348 {
349 ME_DisplayItem *next_para = ME_FindItemFwd(c.pRun, diParagraphOrEnd);
350 ME_DisplayItem *this_para = next_para->member.para.prev_para;
351
352 /* The end of paragraph before a table row is only deleted if there
353 * is nothing else on the line before it. */
354 if (this_para == start_para &&
355 next_para->member.para.nFlags & MEPF_ROWSTART)
356 {
357 /* If the paragraph will be empty, then it should be deleted, however
358 * it still might have text right now which would inherit the
359 * MEPF_STARTROW property if we joined it right now.
360 * Instead we will delete it after the preceding text is deleted. */
361 if (nOfs > this_para->member.para.nCharOfs) {
362 /* Skip this end of line. */
363 nChars -= (eollen < nChars) ? eollen : nChars;
364 continue;
365 }
366 keepFirstParaFormat = TRUE;
367 }
368 }
369 ME_JoinParagraphs(editor, c.pPara, keepFirstParaFormat);
370 /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
371 ME_CheckCharOffsets(editor);
372 nChars -= (eollen < nChars) ? eollen : nChars;
373 continue;
374 }
375 else
376 {
377 ME_Cursor cursor;
378 int nCharsToDelete = min(nChars, c.nOffset);
379 int i;
380
381 c.nOffset -= nCharsToDelete;
382
383 ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
384
385 cursor = c;
386 /* nChars is the number of characters that should be deleted from the
387 PRECEDING runs (these BEFORE cursor.pRun)
388 nCharsToDelete is a number of chars to delete from THIS run */
389 nChars -= nCharsToDelete;
390 shift -= nCharsToDelete;
391 TRACE("Deleting %d (remaining %d) chars at %d in %s (%d)\n",
392 nCharsToDelete, nChars, c.nOffset,
393 debugstr_run( run ), run->len);
394
395 /* nOfs is a character offset (from the start of the document
396 to the current (deleted) run */
397 add_undo_insert_run( editor, nOfs + nChars, get_text( run, c.nOffset ), nCharsToDelete, run->nFlags, run->style );
398
399 ME_StrDeleteV(run->para->text, run->nCharOfs + c.nOffset, nCharsToDelete);
400 run->len -= nCharsToDelete;
401 TRACE("Post deletion string: %s (%d)\n", debugstr_run( run ), run->len);
402 TRACE("Shift value: %d\n", shift);
403
404 /* update cursors (including c) */
405 for (i=-1; i<editor->nCursors; i++) {
406 ME_Cursor *pThisCur = editor->pCursors + i;
407 if (i == -1) pThisCur = &c;
408 if (pThisCur->pRun == cursor.pRun) {
409 if (pThisCur->nOffset > cursor.nOffset) {
410 if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
411 pThisCur->nOffset = cursor.nOffset;
412 else
413 pThisCur->nOffset -= nCharsToDelete;
414 assert(pThisCur->nOffset >= 0);
415 assert(pThisCur->nOffset <= run->len);
416 }
417 if (pThisCur->nOffset == run->len)
418 {
419 pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
420 assert(pThisCur->pRun->type == diRun);
421 pThisCur->nOffset = 0;
422 }
423 }
424 }
425
426 /* c = updated data now */
427
428 if (c.pRun == cursor.pRun)
429 ME_SkipAndPropagateCharOffset(c.pRun, shift);
430 else
431 ME_PropagateCharOffset(c.pRun, shift);
432
433 if (!cursor.pRun->member.run.len)
434 {
435 TRACE("Removing empty run\n");
436 ME_Remove(cursor.pRun);
437 ME_DestroyDisplayItem(cursor.pRun);
438 }
439
440 shift = 0;
441 /*
442 ME_CheckCharOffsets(editor);
443 */
444 continue;
445 }
446 }
447 if (delete_all) ME_SetDefaultParaFormat( editor, &start_para->member.para.fmt );
448 return TRUE;
449 }
450
451 BOOL ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, int nChars)
452 {
453 assert(nCursor>=0 && nCursor<editor->nCursors);
454 /* text operations set modified state */
455 editor->nModifyStep = 1;
456 return ME_InternalDeleteText(editor, &editor->pCursors[nCursor],
457 nChars, FALSE);
458 }
459
460 static ME_DisplayItem *
461 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
462 const WCHAR *str, int len, ME_Style *style,
463 int flags)
464 {
465 ME_Cursor *p = &editor->pCursors[nCursor];
466
467 editor->bCaretAtEnd = FALSE;
468
469 assert(p->pRun->type == diRun);
470
471 return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
472 }
473
474
475 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
476 {
477 ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
478 ME_DisplayItem *di;
479 WCHAR space = ' ';
480
481 /* FIXME no no no */
482 if (ME_IsSelection(editor))
483 ME_DeleteSelection(editor);
484
485 di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
486 MERF_GRAPHICS);
487 di->member.run.ole_obj = heap_alloc(sizeof(*reo));
488 ME_CopyReObject(di->member.run.ole_obj, reo);
489 ME_ReleaseStyle(pStyle);
490 }
491
492
493 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
494 {
495 ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
496 WCHAR space = ' ';
497
498 /* FIXME no no no */
499 if (ME_IsSelection(editor))
500 ME_DeleteSelection(editor);
501
502 ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
503 MERF_ENDROW);
504 ME_ReleaseStyle(pStyle);
505 }
506
507
508 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
509 const WCHAR *str, int len, ME_Style *style)
510 {
511 const WCHAR *pos;
512 ME_Cursor *p = NULL;
513 int oldLen;
514
515 /* FIXME really HERE ? */
516 if (ME_IsSelection(editor))
517 ME_DeleteSelection(editor);
518
519 /* FIXME: is this too slow? */
520 /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
521 oldLen = ME_GetTextLength(editor);
522
523 /* text operations set modified state */
524 editor->nModifyStep = 1;
525
526 assert(style);
527
528 assert(nCursor>=0 && nCursor<editor->nCursors);
529 if (len == -1)
530 len = lstrlenW(str);
531
532 /* grow the text limit to fit our text */
533 if(editor->nTextLimit < oldLen +len)
534 editor->nTextLimit = oldLen + len;
535
536 pos = str;
537
538 while (len)
539 {
540 /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
541 while(pos - str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
542 pos++;
543
544 if (pos != str) { /* handle text */
545 ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
546 } else if (*pos == '\t') { /* handle tabs */
547 WCHAR tab = '\t';
548 ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
549 pos++;
550 } else { /* handle EOLs */
551 ME_DisplayItem *tp, *end_run, *run, *prev;
552 int eol_len = 0;
553
554 /* Check if new line is allowed for this control */
555 if (!(editor->styleFlags & ES_MULTILINE))
556 break;
557
558 /* Find number of CR and LF in end of paragraph run */
559 if (*pos =='\r')
560 {
561 if (len > 1 && pos[1] == '\n')
562 eol_len = 2;
563 else if (len > 2 && pos[1] == '\r' && pos[2] == '\n')
564 eol_len = 3;
565 else
566 eol_len = 1;
567 } else {
568 assert(*pos == '\n');
569 eol_len = 1;
570 }
571 pos += eol_len;
572
573 if (!editor->bEmulateVersion10 && eol_len == 3)
574 {
575 /* handle special \r\r\n sequence (richedit 2.x and higher only) */
576 WCHAR space = ' ';
577 ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
578 } else {
579 const WCHAR cr = '\r', *eol_str = str;
580
581 if (!editor->bEmulateVersion10)
582 {
583 eol_str = &cr;
584 eol_len = 1;
585 }
586
587 p = &editor->pCursors[nCursor];
588
589 if (p->nOffset == p->pRun->member.run.len)
590 {
591 run = ME_FindItemFwd( p->pRun, diRun );
592 if (!run) run = p->pRun;
593 }
594 else
595 {
596 if (p->nOffset) ME_SplitRunSimple(editor, p);
597 run = p->pRun;
598 }
599
600 tp = ME_SplitParagraph(editor, run, style, eol_str, eol_len, 0);
601
602 end_run = ME_FindItemBack(tp, diRun);
603
604 /* Move any cursors that were at the end of the previous run to the beginning of the new para */
605 prev = ME_FindItemBack( end_run, diRun );
606 if (prev)
607 {
608 int i;
609 for (i = 0; i < editor->nCursors; i++)
610 {
611 if (editor->pCursors[i].pRun == prev &&
612 editor->pCursors[i].nOffset == prev->member.run.len)
613 {
614 editor->pCursors[i].pPara = tp;
615 editor->pCursors[i].pRun = run;
616 editor->pCursors[i].nOffset = 0;
617 }
618 }
619 }
620
621 }
622 }
623 len -= pos - str;
624 str = pos;
625 }
626 }
627
628 /* Move the cursor nRelOfs characters (either forwards or backwards)
629 * If final_eop is TRUE, allow moving the cursor to the end of the final eop.
630 *
631 * returns the actual number of characters moved.
632 **/
633 int ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs, BOOL final_eop)
634 {
635 cursor->nOffset += nRelOfs;
636 if (cursor->nOffset < 0)
637 {
638 cursor->nOffset += cursor->pRun->member.run.nCharOfs;
639 if (cursor->nOffset >= 0)
640 {
641 /* new offset in the same paragraph */
642 do {
643 cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
644 } while (cursor->nOffset < cursor->pRun->member.run.nCharOfs);
645 cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
646 return nRelOfs;
647 }
648
649 cursor->nOffset += cursor->pPara->member.para.nCharOfs;
650 if (cursor->nOffset <= 0)
651 {
652 /* moved to the start of the text */
653 nRelOfs -= cursor->nOffset;
654 ME_SetCursorToStart(editor, cursor);
655 return nRelOfs;
656 }
657
658 /* new offset in a previous paragraph */
659 do {
660 cursor->pPara = cursor->pPara->member.para.prev_para;
661 } while (cursor->nOffset < cursor->pPara->member.para.nCharOfs);
662 cursor->nOffset -= cursor->pPara->member.para.nCharOfs;
663
664 cursor->pRun = ME_FindItemBack(cursor->pPara->member.para.next_para, diRun);
665 while (cursor->nOffset < cursor->pRun->member.run.nCharOfs) {
666 cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
667 }
668 cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
669 } else if (cursor->nOffset >= cursor->pRun->member.run.len) {
670 ME_DisplayItem *next_para;
671 int new_offset;
672
673 new_offset = ME_GetCursorOfs(cursor);
674 next_para = cursor->pPara->member.para.next_para;
675 if (new_offset < next_para->member.para.nCharOfs)
676 {
677 /* new offset in the same paragraph */
678 do {
679 cursor->nOffset -= cursor->pRun->member.run.len;
680 cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
681 } while (cursor->nOffset >= cursor->pRun->member.run.len);
682 return nRelOfs;
683 }
684
685 if (new_offset >= ME_GetTextLength(editor) + (final_eop ? 1 : 0))
686 {
687 /* new offset at the end of the text */
688 ME_SetCursorToEnd(editor, cursor, final_eop);
689 nRelOfs -= new_offset - (ME_GetTextLength(editor) + (final_eop ? 1 : 0));
690 return nRelOfs;
691 }
692
693 /* new offset in a following paragraph */
694 do {
695 cursor->pPara = next_para;
696 next_para = next_para->member.para.next_para;
697 } while (new_offset >= next_para->member.para.nCharOfs);
698
699 cursor->nOffset = new_offset - cursor->pPara->member.para.nCharOfs;
700 cursor->pRun = ME_FindItemFwd(cursor->pPara, diRun);
701 while (cursor->nOffset >= cursor->pRun->member.run.len)
702 {
703 cursor->nOffset -= cursor->pRun->member.run.len;
704 cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
705 }
706 } /* else new offset is in the same run */
707 return nRelOfs;
708 }
709
710
711 BOOL
712 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
713 {
714 ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
715 ME_DisplayItem *pPara = cursor->pPara;
716 int nOffset = cursor->nOffset;
717
718 if (nRelOfs == -1)
719 {
720 /* Backward movement */
721 while (TRUE)
722 {
723 nOffset = ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
724 pRun->member.run.len, nOffset, WB_MOVEWORDLEFT);
725 if (nOffset)
726 break;
727 pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
728 if (pOtherRun->type == diRun)
729 {
730 if (ME_CallWordBreakProc(editor, get_text( &pOtherRun->member.run, 0 ),
731 pOtherRun->member.run.len,
732 pOtherRun->member.run.len - 1,
733 WB_ISDELIMITER)
734 && !(pRun->member.run.nFlags & MERF_ENDPARA)
735 && !(cursor->pRun == pRun && cursor->nOffset == 0)
736 && !ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
737 pRun->member.run.len, 0,
738 WB_ISDELIMITER))
739 break;
740 pRun = pOtherRun;
741 nOffset = pOtherRun->member.run.len;
742 }
743 else if (pOtherRun->type == diParagraph)
744 {
745 if (cursor->pRun == pRun && cursor->nOffset == 0)
746 {
747 pPara = pOtherRun;
748 /* Skip empty start of table row paragraph */
749 if (pPara->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
750 pPara = pPara->member.para.prev_para;
751 /* Paragraph breaks are treated as separate words */
752 if (pPara->member.para.prev_para->type == diTextStart)
753 return FALSE;
754
755 pRun = ME_FindItemBack(pPara, diRun);
756 pPara = pPara->member.para.prev_para;
757 }
758 break;
759 }
760 }
761 }
762 else
763 {
764 /* Forward movement */
765 BOOL last_delim = FALSE;
766
767 while (TRUE)
768 {
769 if (last_delim && !ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
770 pRun->member.run.len, nOffset, WB_ISDELIMITER))
771 break;
772 nOffset = ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
773 pRun->member.run.len, nOffset, WB_MOVEWORDRIGHT);
774 if (nOffset < pRun->member.run.len)
775 break;
776 pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
777 if (pOtherRun->type == diRun)
778 {
779 last_delim = ME_CallWordBreakProc(editor, get_text( &pRun->member.run, 0 ),
780 pRun->member.run.len, nOffset - 1, WB_ISDELIMITER);
781 pRun = pOtherRun;
782 nOffset = 0;
783 }
784 else if (pOtherRun->type == diParagraph)
785 {
786 if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
787 pOtherRun = pOtherRun->member.para.next_para;
788 if (cursor->pRun == pRun) {
789 pPara = pOtherRun;
790 pRun = ME_FindItemFwd(pPara, diRun);
791 }
792 nOffset = 0;
793 break;
794 }
795 else /* diTextEnd */
796 {
797 if (cursor->pRun == pRun)
798 return FALSE;
799 nOffset = 0;
800 break;
801 }
802 }
803 }
804 cursor->pPara = pPara;
805 cursor->pRun = pRun;
806 cursor->nOffset = nOffset;
807 return TRUE;
808 }
809
810
811 static void
812 ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
813 {
814 /* pCursor[0] is the end of the selection
815 * pCursor[1] is the start of the selection (or the position selection anchor)
816 * pCursor[2] and [3] are the selection anchors that are backed up
817 * so they are kept when the selection changes for drag selection.
818 */
819
820 editor->nSelectionType = selectionType;
821 switch(selectionType)
822 {
823 case stPosition:
824 break;
825 case stWord:
826 ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
827 editor->pCursors[1] = editor->pCursors[0];
828 ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
829 break;
830 case stLine:
831 case stParagraph:
832 {
833 ME_DisplayItem *pItem;
834 ME_DIType fwdSearchType, backSearchType;
835 if (selectionType == stParagraph) {
836 backSearchType = diParagraph;
837 fwdSearchType = diParagraphOrEnd;
838 } else {
839 backSearchType = diStartRow;
840 fwdSearchType = diStartRowOrParagraphOrEnd;
841 }
842 pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
843 assert(pItem);
844 if (pItem->type == diTextEnd)
845 editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
846 else
847 editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
848 editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
849 editor->pCursors[0].nOffset = 0;
850
851 pItem = ME_FindItemBack(pItem, backSearchType);
852 editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
853 editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
854 editor->pCursors[1].nOffset = 0;
855 break;
856 }
857 case stDocument:
858 /* Select everything with cursor anchored from the start of the text */
859 editor->nSelectionType = stDocument;
860 ME_SetCursorToStart(editor, &editor->pCursors[1]);
861 ME_SetCursorToEnd(editor, &editor->pCursors[0], FALSE);
862 break;
863 default: assert(0);
864 }
865 /* Store the anchor positions for extending the selection. */
866 editor->pCursors[2] = editor->pCursors[0];
867 editor->pCursors[3] = editor->pCursors[1];
868 }
869
870 int ME_GetCursorOfs(const ME_Cursor *cursor)
871 {
872 return cursor->pPara->member.para.nCharOfs
873 + cursor->pRun->member.run.nCharOfs + cursor->nOffset;
874 }
875
876 /* Helper function for ME_FindPixelPos to find paragraph within tables */
877 static ME_DisplayItem* ME_FindPixelPosInTableRow(int x, int y,
878 ME_DisplayItem *para)
879 {
880 ME_DisplayItem *cell, *next_cell;
881 assert(para->member.para.nFlags & MEPF_ROWSTART);
882 cell = para->member.para.next_para->member.para.pCell;
883 assert(cell);
884
885 /* find the cell we are in */
886 while ((next_cell = cell->member.cell.next_cell) != NULL) {
887 if (x < next_cell->member.cell.pt.x)
888 {
889 para = ME_FindItemFwd(cell, diParagraph);
890 /* Found the cell, but there might be multiple paragraphs in
891 * the cell, so need to search down the cell for the paragraph. */
892 while (cell == para->member.para.pCell) {
893 if (y < para->member.para.pt.y + para->member.para.nHeight)
894 {
895 if (para->member.para.nFlags & MEPF_ROWSTART)
896 return ME_FindPixelPosInTableRow(x, y, para);
897 else
898 return para;
899 }
900 para = para->member.para.next_para;
901 }
902 /* Past the end of the cell, so go back to the last cell paragraph */
903 return para->member.para.prev_para;
904 }
905 cell = next_cell;
906 }
907 /* Return table row delimiter */
908 para = ME_FindItemFwd(cell, diParagraph);
909 assert(para->member.para.nFlags & MEPF_ROWEND);
910 assert(para->member.para.fmt.dwMask & PFM_TABLEROWDELIMITER);
911 assert(para->member.para.fmt.wEffects & PFE_TABLEROWDELIMITER);
912 return para;
913 }
914
915 static BOOL ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
916 int x, ME_Cursor *cursor, BOOL *pbCaretAtEnd)
917 {
918 ME_DisplayItem *pNext, *pLastRun;
919 ME_Row *row = &pRow->member.row;
920 BOOL exact = TRUE;
921
922 if (x < row->pt.x)
923 {
924 x = row->pt.x;
925 exact = FALSE;
926 }
927 pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
928 assert(pNext->type == diRun);
929 if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
930 cursor->nOffset = 0;
931 do {
932 int run_x = pNext->member.run.pt.x;
933 int width = pNext->member.run.nWidth;
934
935 if (x >= run_x && x < run_x+width)
936 {
937 cursor->nOffset = ME_CharFromPoint(editor, x-run_x, &pNext->member.run, TRUE, TRUE);
938 cursor->pRun = pNext;
939 cursor->pPara = ME_GetParagraph( cursor->pRun );
940 return exact;
941 }
942 pLastRun = pNext;
943 pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
944 } while(pNext && pNext->type == diRun);
945
946 if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
947 {
948 cursor->pRun = ME_FindItemFwd(pNext, diRun);
949 if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
950 }
951 else
952 cursor->pRun = pLastRun;
953
954 cursor->pPara = ME_GetParagraph( cursor->pRun );
955 return FALSE;
956 }
957
958 /* Finds the run and offset from the pixel position.
959 *
960 * x & y are pixel positions in virtual coordinates into the rich edit control,
961 * so client coordinates must first be adjusted by the scroll position.
962 *
963 * If final_eop is TRUE consider the final end-of-paragraph.
964 *
965 * returns TRUE if the result was exactly under the cursor, otherwise returns
966 * FALSE, and result is set to the closest position to the coordinates.
967 */
968 static BOOL ME_FindPixelPos(ME_TextEditor *editor, int x, int y,
969 ME_Cursor *result, BOOL *is_eol, BOOL final_eop)
970 {
971 ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
972 BOOL isExact = TRUE;
973
974 x -= editor->rcFormat.left;
975 y -= editor->rcFormat.top;
976
977 if (is_eol)
978 *is_eol = FALSE;
979
980 /* find paragraph */
981 for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
982 {
983 assert(p->type == diParagraph);
984 if (y < p->member.para.pt.y + p->member.para.nHeight)
985 {
986 if (p->member.para.nFlags & MEPF_ROWSTART)
987 p = ME_FindPixelPosInTableRow(x, y, p);
988 y -= p->member.para.pt.y;
989 p = ME_FindItemFwd(p, diStartRow);
990 break;
991 } else if (p->member.para.nFlags & MEPF_ROWSTART) {
992 p = ME_GetTableRowEnd(p);
993 }
994 }
995 /* find row */
996 for (; p != editor->pBuffer->pLast; )
997 {
998 ME_DisplayItem *pp;
999 assert(p->type == diStartRow);
1000 if (y < p->member.row.pt.y + p->member.row.nHeight) break;
1001 pp = ME_FindItemFwd(p, diStartRow);
1002 if (!pp) break;
1003 p = pp;
1004 }
1005 if (p == editor->pBuffer->pLast && !final_eop)
1006 {
1007 /* The position is below the last paragraph, so the last row will be used
1008 * rather than the end of the text, so the x position will be used to
1009 * determine the offset closest to the pixel position. */
1010 isExact = FALSE;
1011 p = ME_FindItemBack(p, diStartRow);
1012 if (!p) p = editor->pBuffer->pLast;
1013 }
1014
1015 assert( p->type == diStartRow || p == editor->pBuffer->pLast );
1016
1017 if( p->type == diStartRow )
1018 return ME_FindRunInRow( editor, p, x, result, is_eol ) && isExact;
1019
1020 ME_SetCursorToEnd(editor, result, TRUE);
1021 return FALSE;
1022 }
1023
1024
1025 /* Sets the cursor to the position closest to the pixel position
1026 *
1027 * x & y are pixel positions in client coordinates.
1028 *
1029 * isExact will be set to TRUE if the run is directly under the pixel
1030 * position, FALSE if it not, unless isExact is set to NULL.
1031 *
1032 * return FALSE if outside client area and the cursor is not set,
1033 * otherwise TRUE is returned.
1034 */
1035 BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y,
1036 ME_Cursor *cursor, BOOL *isExact)
1037 {
1038 RECT rc;
1039 BOOL bResult;
1040
1041 ITextHost_TxGetClientRect(editor->texthost, &rc);
1042 if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
1043 if (isExact) *isExact = FALSE;
1044 return FALSE;
1045 }
1046 x += editor->horz_si.nPos;
1047 y += editor->vert_si.nPos;
1048 bResult = ME_FindPixelPos(editor, x, y, cursor, NULL, FALSE);
1049 if (isExact) *isExact = bResult;
1050 return TRUE;
1051 }
1052
1053
1054
1055 /* Extends the selection with a word, line, or paragraph selection type.
1056 *
1057 * The selection is anchored by editor->pCursors[2-3] such that the text
1058 * between the anchors will remain selected, and one end will be extended.
1059 *
1060 * editor->pCursors[0] should have the position to extend the selection to
1061 * before this function is called.
1062 *
1063 * Nothing will be done if editor->nSelectionType equals stPosition.
1064 */
1065 static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
1066 {
1067 ME_Cursor tmp_cursor;
1068 int curOfs, anchorStartOfs, anchorEndOfs;
1069 if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
1070 return;
1071 curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
1072 anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
1073 anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
1074
1075 tmp_cursor = editor->pCursors[0];
1076 editor->pCursors[0] = editor->pCursors[2];
1077 editor->pCursors[1] = editor->pCursors[3];
1078 if (curOfs < anchorStartOfs)
1079 {
1080 /* Extend the left side of selection */
1081 editor->pCursors[1] = tmp_cursor;
1082 if (editor->nSelectionType == stWord)
1083 ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
1084 else
1085 {
1086 ME_DisplayItem *pItem;
1087 ME_DIType searchType = ((editor->nSelectionType == stLine) ?
1088 diStartRowOrParagraph:diParagraph);
1089 pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
1090 editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
1091 editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
1092 editor->pCursors[1].nOffset = 0;
1093 }
1094 }
1095 else if (curOfs >= anchorEndOfs)
1096 {
1097 /* Extend the right side of selection */
1098 editor->pCursors[0] = tmp_cursor;
1099 if (editor->nSelectionType == stWord)
1100 ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
1101 else
1102 {
1103 ME_DisplayItem *pItem;
1104 ME_DIType searchType = ((editor->nSelectionType == stLine) ?
1105 diStartRowOrParagraphOrEnd:diParagraphOrEnd);
1106 pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
1107 if (pItem->type == diTextEnd)
1108 editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
1109 else
1110 editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
1111 editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
1112 editor->pCursors[0].nOffset = 0;
1113 }
1114 }
1115 }
1116
1117 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1118 {
1119 ME_Cursor tmp_cursor;
1120 BOOL is_selection = FALSE, is_shift;
1121
1122 editor->nUDArrowX = -1;
1123
1124 x += editor->horz_si.nPos;
1125 y += editor->vert_si.nPos;
1126
1127 tmp_cursor = editor->pCursors[0];
1128 is_selection = ME_IsSelection(editor);
1129 is_shift = GetKeyState(VK_SHIFT) < 0;
1130
1131 ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd, FALSE);
1132
1133 if (x >= editor->rcFormat.left || is_shift)
1134 {
1135 if (clickNum > 1)
1136 {
1137 editor->pCursors[1] = editor->pCursors[0];
1138 if (is_shift) {
1139 if (x >= editor->rcFormat.left)
1140 ME_SelectByType(editor, stWord);
1141 else
1142 ME_SelectByType(editor, stParagraph);
1143 } else if (clickNum % 2 == 0) {
1144 ME_SelectByType(editor, stWord);
1145 } else {
1146 ME_SelectByType(editor, stParagraph);
1147 }
1148 }
1149 else if (!is_shift)
1150 {
1151 editor->nSelectionType = stPosition;
1152 editor->pCursors[1] = editor->pCursors[0];
1153 }
1154 else if (!is_selection)
1155 {
1156 editor->nSelectionType = stPosition;
1157 editor->pCursors[1] = tmp_cursor;
1158 }
1159 else if (editor->nSelectionType != stPosition)
1160 {
1161 ME_ExtendAnchorSelection(editor);
1162 }
1163 }
1164 else
1165 {
1166 if (clickNum < 2) {
1167 ME_SelectByType(editor, stLine);
1168 } else if (clickNum % 2 == 0 || is_shift) {
1169 ME_SelectByType(editor, stParagraph);
1170 } else {
1171 ME_SelectByType(editor, stDocument);
1172 }
1173 }
1174 ME_InvalidateSelection(editor);
1175 ITextHost_TxShowCaret(editor->texthost, FALSE);
1176 ME_ShowCaret(editor);
1177 ME_SendSelChange(editor);
1178 }
1179
1180 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
1181 {
1182 ME_Cursor tmp_cursor;
1183
1184 if (editor->nSelectionType == stDocument)
1185 return;
1186 x += editor->horz_si.nPos;
1187 y += editor->vert_si.nPos;
1188
1189 tmp_cursor = editor->pCursors[0];
1190 /* FIXME: do something with the return value of ME_FindPixelPos */
1191 ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd, TRUE);
1192
1193 ME_InvalidateSelection(editor);
1194 editor->pCursors[0] = tmp_cursor;
1195 ME_ExtendAnchorSelection(editor);
1196
1197 if (editor->nSelectionType != stPosition &&
1198 memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1199 {
1200 /* The scroll the cursor towards the other end, since it was the one
1201 * extended by ME_ExtendAnchorSelection */
1202 ME_EnsureVisible(editor, &editor->pCursors[1]);
1203 } else {
1204 ME_EnsureVisible(editor, &editor->pCursors[0]);
1205 }
1206
1207 ME_InvalidateSelection(editor);
1208 ITextHost_TxShowCaret(editor->texthost, FALSE);
1209 ME_ShowCaret(editor);
1210 ME_SendSelChange(editor);
1211 }
1212
1213 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1214 {
1215 ME_DisplayItem *pRun = pCursor->pRun;
1216 int x;
1217
1218 if (editor->nUDArrowX != -1)
1219 x = editor->nUDArrowX;
1220 else {
1221 if (editor->bCaretAtEnd)
1222 {
1223 pRun = ME_FindItemBack(pRun, diRun);
1224 assert(pRun);
1225 x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1226 }
1227 else {
1228 x = pRun->member.run.pt.x;
1229 x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset, TRUE);
1230 }
1231 editor->nUDArrowX = x;
1232 }
1233 return x;
1234 }
1235
1236
1237 static void
1238 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs, BOOL extend)
1239 {
1240 ME_DisplayItem *pRun = pCursor->pRun;
1241 ME_DisplayItem *pOldPara = pCursor->pPara;
1242 ME_DisplayItem *pItem, *pNewPara;
1243 int x = ME_GetXForArrow(editor, pCursor);
1244
1245 if (editor->bCaretAtEnd && !pCursor->nOffset)
1246 if (!ME_PrevRun(&pOldPara, &pRun, TRUE))
1247 return;
1248
1249 if (nRelOfs == -1)
1250 {
1251 /* start of this row */
1252 pItem = ME_FindItemBack(pRun, diStartRow);
1253 assert(pItem);
1254 /* start of the previous row */
1255 pItem = ME_FindItemBack(pItem, diStartRow);
1256 if (!pItem) /* row not found */
1257 {
1258 if (extend)
1259 ME_SetCursorToStart(editor, pCursor);
1260 return;
1261 }
1262 pNewPara = ME_GetParagraph(pItem);
1263 if (pOldPara->member.para.nFlags & MEPF_ROWEND ||
1264 (pOldPara->member.para.pCell &&
1265 pOldPara->member.para.pCell != pNewPara->member.para.pCell))
1266 {
1267 /* Brought out of a cell */
1268 pNewPara = ME_GetTableRowStart(pOldPara)->member.para.prev_para;
1269 if (pNewPara->type == diTextStart)
1270 return; /* At the top, so don't go anywhere. */
1271 pItem = ME_FindItemFwd(pNewPara, diStartRow);
1272 }
1273 if (pNewPara->member.para.nFlags & MEPF_ROWEND)
1274 {
1275 /* Brought into a table row */
1276 ME_Cell *cell = &ME_FindItemBack(pNewPara, diCell)->member.cell;
1277 while (x < cell->pt.x && cell->prev_cell)
1278 cell = &cell->prev_cell->member.cell;
1279 if (cell->next_cell) /* else - we are still at the end of the row */
1280 pItem = ME_FindItemBack(cell->next_cell, diStartRow);
1281 }
1282 }
1283 else
1284 {
1285 /* start of the next row */
1286 pItem = ME_FindItemFwd(pRun, diStartRow);
1287 if (!pItem) /* row not found */
1288 {
1289 if (extend)
1290 ME_SetCursorToEnd(editor, pCursor, TRUE);
1291 return;
1292 }
1293 pNewPara = ME_GetParagraph(pItem);
1294 if (pOldPara->member.para.nFlags & MEPF_ROWSTART ||
1295 (pOldPara->member.para.pCell &&
1296 pOldPara->member.para.pCell != pNewPara->member.para.pCell))
1297 {
1298 /* Brought out of a cell */
1299 pNewPara = ME_GetTableRowEnd(pOldPara)->member.para.next_para;
1300 if (pNewPara->type == diTextEnd)
1301 return; /* At the bottom, so don't go anywhere. */
1302 pItem = ME_FindItemFwd(pNewPara, diStartRow);
1303 }
1304 if (pNewPara->member.para.nFlags & MEPF_ROWSTART)
1305 {
1306 /* Brought into a table row */
1307 ME_DisplayItem *cell = ME_FindItemFwd(pNewPara, diCell);
1308 while (cell->member.cell.next_cell &&
1309 x >= cell->member.cell.next_cell->member.cell.pt.x)
1310 cell = cell->member.cell.next_cell;
1311 pItem = ME_FindItemFwd(cell, diStartRow);
1312 }
1313 }
1314 if (!pItem)
1315 {
1316 /* row not found - ignore */
1317 return;
1318 }
1319 ME_FindRunInRow(editor, pItem, x, pCursor, &editor->bCaretAtEnd);
1320 assert(pCursor->pRun);
1321 assert(pCursor->pRun->type == diRun);
1322 }
1323
1324 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1325 {
1326 ME_DisplayItem *p = ME_FindItemFwd(editor->pBuffer->pFirst, diStartRow);
1327
1328 if (editor->vert_si.nPos < p->member.row.nHeight)
1329 {
1330 ME_SetCursorToStart(editor, pCursor);
1331 editor->bCaretAtEnd = FALSE;
1332 /* Native clears seems to clear this x value on page up at the top
1333 * of the text, but not on page down at the end of the text.
1334 * Doesn't make sense, but we try to be bug for bug compatible. */
1335 editor->nUDArrowX = -1;
1336 } else {
1337 ME_DisplayItem *pRun = pCursor->pRun;
1338 ME_DisplayItem *pLast;
1339 int x, y, yd, yp;
1340 int yOldScrollPos = editor->vert_si.nPos;
1341
1342 x = ME_GetXForArrow(editor, pCursor);
1343 if (!pCursor->nOffset && editor->bCaretAtEnd)
1344 pRun = ME_FindItemBack(pRun, diRun);
1345
1346 p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1347 assert(p->type == diStartRow);
1348 yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1349 y = yp + p->member.row.pt.y;
1350
1351 ME_ScrollUp(editor, editor->sizeWindow.cy);
1352 /* Only move the cursor by the amount scrolled. */
1353 yd = y + editor->vert_si.nPos - yOldScrollPos;
1354 pLast = p;
1355
1356 do {
1357 p = ME_FindItemBack(p, diStartRowOrParagraph);
1358 if (!p)
1359 break;
1360 if (p->type == diParagraph) { /* crossing paragraphs */
1361 if (p->member.para.prev_para == NULL)
1362 break;
1363 yp = p->member.para.prev_para->member.para.pt.y;
1364 continue;
1365 }
1366 y = yp + p->member.row.pt.y;
1367 if (y < yd)
1368 break;
1369 pLast = p;
1370 } while(1);
1371
1372 ME_FindRunInRow(editor, pLast, x, pCursor, &editor->bCaretAtEnd);
1373 }
1374 assert(pCursor->pRun);
1375 assert(pCursor->pRun->type == diRun);
1376 }
1377
1378 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1379 {
1380 ME_DisplayItem *pLast;
1381 int x, y;
1382
1383 /* Find y position of the last row */
1384 pLast = editor->pBuffer->pLast;
1385 y = pLast->member.para.prev_para->member.para.pt.y
1386 + ME_FindItemBack(pLast, diStartRow)->member.row.pt.y;
1387
1388 x = ME_GetXForArrow(editor, pCursor);
1389
1390 if (editor->vert_si.nPos >= y - editor->sizeWindow.cy)
1391 {
1392 ME_SetCursorToEnd(editor, pCursor, FALSE);
1393 editor->bCaretAtEnd = FALSE;
1394 } else {
1395 ME_DisplayItem *pRun = pCursor->pRun;
1396 ME_DisplayItem *p;
1397 int yd, yp;
1398 int yOldScrollPos = editor->vert_si.nPos;
1399
1400 if (!pCursor->nOffset && editor->bCaretAtEnd)
1401 pRun = ME_FindItemBack(pRun, diRun);
1402
1403 p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1404 assert(p->type == diStartRow);
1405 yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1406 y = yp + p->member.row.pt.y;
1407
1408 /* For native richedit controls:
1409 * v1.0 - v3.1 can only scroll down as far as the scrollbar lets us
1410 * v4.1 can scroll past this position here. */
1411 ME_ScrollDown(editor, editor->sizeWindow.cy);
1412 /* Only move the cursor by the amount scrolled. */
1413 yd = y + editor->vert_si.nPos - yOldScrollPos;
1414 pLast = p;
1415
1416 do {
1417 p = ME_FindItemFwd(p, diStartRowOrParagraph);
1418 if (!p)
1419 break;
1420 if (p->type == diParagraph) {
1421 yp = p->member.para.pt.y;
1422 continue;
1423 }
1424 y = yp + p->member.row.pt.y;
1425 if (y >= yd)
1426 break;
1427 pLast = p;
1428 } while(1);
1429
1430 ME_FindRunInRow(editor, pLast, x, pCursor, &editor->bCaretAtEnd);
1431 }
1432 assert(pCursor->pRun);
1433 assert(pCursor->pRun->type == diRun);
1434 }
1435
1436 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1437 {
1438 ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1439 if (pRow) {
1440 ME_DisplayItem *pRun;
1441 if (editor->bCaretAtEnd && !pCursor->nOffset) {
1442 pRow = ME_FindItemBack(pRow, diStartRow);
1443 if (!pRow)
1444 return;
1445 }
1446 pRun = ME_FindItemFwd(pRow, diRun);
1447 if (pRun) {
1448 pCursor->pRun = pRun;
1449 assert(pCursor->pPara == ME_GetParagraph(pRun));
1450 pCursor->nOffset = 0;
1451 }
1452 }
1453 editor->bCaretAtEnd = FALSE;
1454 }
1455
1456 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1457 {
1458 ME_SetCursorToStart(editor, pCursor);
1459 editor->bCaretAtEnd = FALSE;
1460 }
1461
1462 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1463 {
1464 ME_DisplayItem *pRow;
1465
1466 if (editor->bCaretAtEnd && !pCursor->nOffset)
1467 return;
1468
1469 pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1470 assert(pRow);
1471 if (pRow->type == diStartRow) {
1472 ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1473 assert(pRun);
1474 pCursor->pRun = pRun;
1475 assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1476 pCursor->nOffset = 0;
1477 editor->bCaretAtEnd = TRUE;
1478 return;
1479 }
1480 pCursor->pRun = ME_FindItemBack(pRow, diRun);
1481 assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1482 assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1483 pCursor->nOffset = 0;
1484 editor->bCaretAtEnd = FALSE;
1485 }
1486
1487 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1488 {
1489 ME_SetCursorToEnd(editor, pCursor, FALSE);
1490 editor->bCaretAtEnd = FALSE;
1491 }
1492
1493 BOOL ME_IsSelection(ME_TextEditor *editor)
1494 {
1495 return editor->pCursors[0].pRun != editor->pCursors[1].pRun ||
1496 editor->pCursors[0].nOffset != editor->pCursors[1].nOffset;
1497 }
1498
1499 void ME_DeleteSelection(ME_TextEditor *editor)
1500 {
1501 int from, to;
1502 int nStartCursor = ME_GetSelectionOfs(editor, &from, &to);
1503 int nEndCursor = nStartCursor ^ 1;
1504 ME_DeleteTextAtCursor(editor, nStartCursor, to - from);
1505 editor->pCursors[nEndCursor] = editor->pCursors[nStartCursor];
1506 }
1507
1508 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1509 {
1510 return ME_GetInsertStyle(editor, 0);
1511 }
1512
1513 void ME_SendSelChange(ME_TextEditor *editor)
1514 {
1515 SELCHANGE sc;
1516
1517 sc.nmhdr.hwndFrom = NULL;
1518 sc.nmhdr.idFrom = 0;
1519 sc.nmhdr.code = EN_SELCHANGE;
1520 ME_GetSelectionOfs(editor, &sc.chrg.cpMin, &sc.chrg.cpMax);
1521 sc.seltyp = SEL_EMPTY;
1522 if (sc.chrg.cpMin != sc.chrg.cpMax)
1523 sc.seltyp |= SEL_TEXT;
1524 if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* what were RICHEDIT authors thinking ? */
1525 sc.seltyp |= SEL_MULTICHAR;
1526
1527 if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1528 {
1529 ME_ClearTempStyle(editor);
1530
1531 editor->notified_cr = sc.chrg;
1532
1533 if (editor->nEventMask & ENM_SELCHANGE)
1534 {
1535 TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1536 sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1537 (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1538 (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1539 ITextHost_TxNotify(editor->texthost, sc.nmhdr.code, &sc);
1540 }
1541 }
1542 }
1543
1544 BOOL
1545 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1546 {
1547 int nCursor = 0;
1548 ME_Cursor *p = &editor->pCursors[nCursor];
1549 ME_Cursor tmp_curs = *p;
1550 BOOL success = FALSE;
1551
1552 ME_CheckCharOffsets(editor);
1553 switch(nVKey) {
1554 case VK_LEFT:
1555 editor->bCaretAtEnd = FALSE;
1556 if (ctrl)
1557 success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1558 else
1559 success = ME_MoveCursorChars(editor, &tmp_curs, -1, extend);
1560 break;
1561 case VK_RIGHT:
1562 editor->bCaretAtEnd = FALSE;
1563 if (ctrl)
1564 success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1565 else
1566 success = ME_MoveCursorChars(editor, &tmp_curs, +1, extend);
1567 break;
1568 case VK_UP:
1569 ME_MoveCursorLines(editor, &tmp_curs, -1, extend);
1570 break;
1571 case VK_DOWN:
1572 ME_MoveCursorLines(editor, &tmp_curs, +1, extend);
1573 break;
1574 case VK_PRIOR:
1575 ME_ArrowPageUp(editor, &tmp_curs);
1576 break;
1577 case VK_NEXT:
1578 ME_ArrowPageDown(editor, &tmp_curs);
1579 break;
1580 case VK_HOME: {
1581 if (ctrl)
1582 ME_ArrowCtrlHome(editor, &tmp_curs);
1583 else
1584 ME_ArrowHome(editor, &tmp_curs);
1585 editor->bCaretAtEnd = FALSE;
1586 break;
1587 }
1588 case VK_END:
1589 if (ctrl)
1590 ME_ArrowCtrlEnd(editor, &tmp_curs);
1591 else
1592 ME_ArrowEnd(editor, &tmp_curs);
1593 break;
1594 }
1595
1596 if (!extend)
1597 editor->pCursors[1] = tmp_curs;
1598 *p = tmp_curs;
1599
1600 ME_InvalidateSelection(editor);
1601 ME_Repaint(editor);
1602 ITextHost_TxShowCaret(editor->texthost, FALSE);
1603 ME_EnsureVisible(editor, &tmp_curs);
1604 ME_ShowCaret(editor);
1605 ME_SendSelChange(editor);
1606 return success;
1607 }