sync with trunk r46493
[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)
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 if (ME_GetCursorOfs(&editor->pCursors[0]) < ME_GetCursorOfs(&editor->pCursors[1]))
60 {
61 *from = &editor->pCursors[0];
62 *to = &editor->pCursors[1];
63 return 0;
64 } else {
65 *from = &editor->pCursors[1];
66 *to = &editor->pCursors[0];
67 return 1;
68 }
69 }
70
71 int ME_GetTextLength(ME_TextEditor *editor)
72 {
73 ME_Cursor cursor;
74 ME_SetCursorToEnd(editor, &cursor);
75 return ME_GetCursorOfs(&cursor);
76 }
77
78
79 int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
80 {
81 int length;
82
83 if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
84 return E_INVALIDARG;
85 if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
86 return E_INVALIDARG;
87
88 length = ME_GetTextLength(editor);
89
90 if ((editor->styleFlags & ES_MULTILINE)
91 && (how->flags & GTL_USECRLF)
92 && !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
93 length += editor->nParagraphs - 1;
94
95 if (how->flags & GTL_NUMBYTES ||
96 (how->flags & GTL_PRECISE && /* GTL_PRECISE seems to imply GTL_NUMBYTES */
97 !(how->flags & GTL_NUMCHARS))) /* unless GTL_NUMCHARS is given */
98 {
99 CPINFO cpinfo;
100
101 if (how->codepage == 1200)
102 return length * 2;
103 if (how->flags & GTL_PRECISE)
104 FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
105 if (GetCPInfo(how->codepage, &cpinfo))
106 return length * cpinfo.MaxCharSize;
107 ERR("Invalid codepage %u\n", how->codepage);
108 return E_INVALIDARG;
109 }
110 return length;
111 }
112
113
114 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
115 {
116 int selectionEnd = 0;
117 const int len = ME_GetTextLength(editor);
118
119 /* all negative values are effectively the same */
120 if (from < 0)
121 from = -1;
122 if (to < 0)
123 to = -1;
124
125 /* select all */
126 if (from == 0 && to == -1)
127 {
128 ME_SetCursorToStart(editor, &editor->pCursors[1]);
129 ME_SetCursorToEnd(editor, &editor->pCursors[0]);
130 ME_InvalidateSelection(editor);
131 ME_ClearTempStyle(editor);
132 return len + 1;
133 }
134
135 /* if both values are equal and also out of bound, that means to */
136 /* put the selection at the end of the text */
137 if ((from == to) && (to < 0 || to > len))
138 {
139 selectionEnd = 1;
140 }
141 else
142 {
143 /* if from is negative and to is positive then selection is */
144 /* deselected and caret moved to end of the current selection */
145 if (from < 0)
146 {
147 int start, end;
148 ME_GetSelectionOfs(editor, &start, &end);
149 editor->pCursors[1] = editor->pCursors[0];
150 ME_Repaint(editor);
151 ME_ClearTempStyle(editor);
152 return end;
153 }
154
155 /* adjust to if it's a negative value */
156 if (to < 0)
157 to = len + 1;
158
159 /* flip from and to if they are reversed */
160 if (from>to)
161 {
162 int tmp = from;
163 from = to;
164 to = tmp;
165 }
166
167 /* after fiddling with the values, we find from > len && to > len */
168 if (from > len)
169 selectionEnd = 1;
170 /* special case with to too big */
171 else if (to > len)
172 to = len + 1;
173 }
174
175 if (selectionEnd)
176 {
177 ME_SetCursorToEnd(editor, &editor->pCursors[0]);
178 editor->pCursors[1] = editor->pCursors[0];
179 ME_InvalidateSelection(editor);
180 ME_ClearTempStyle(editor);
181 return len;
182 }
183
184 ME_CursorFromCharOfs(editor, from, &editor->pCursors[1]);
185 editor->pCursors[0] = editor->pCursors[1];
186 ME_MoveCursorChars(editor, &editor->pCursors[0], to - from);
187 /* Selection is not allowed in the middle of an end paragraph run. */
188 if (editor->pCursors[1].pRun->member.run.nFlags & MERF_ENDPARA)
189 editor->pCursors[1].nOffset = 0;
190 if (editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA)
191 editor->pCursors[0].nOffset = 0;
192 return to;
193 }
194
195
196 static void
197 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
198 int *x, int *y, int *height)
199 {
200 ME_DisplayItem *row;
201 ME_DisplayItem *run = pCursor->pRun;
202 ME_DisplayItem *para = pCursor->pPara;
203 ME_DisplayItem *pSizeRun = run;
204 ME_Context c;
205 SIZE sz = {0, 0};
206
207 assert(height && x && y);
208 assert(~para->member.para.nFlags & MEPF_REWRAP);
209 assert(run && run->type == diRun);
210 assert(para && para->type == diParagraph);
211
212 row = ME_FindItemBack(run, diStartRowOrParagraph);
213 assert(row && row->type == diStartRow);
214
215 ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));
216
217 if (!pCursor->nOffset)
218 {
219 ME_DisplayItem *prev = ME_FindItemBack(run, diRunOrParagraph);
220 assert(prev);
221 if (prev->type == diRun)
222 pSizeRun = prev;
223 }
224 if (editor->bCaretAtEnd && !pCursor->nOffset &&
225 run == ME_FindItemFwd(row, diRun))
226 {
227 ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
228 assert(tmp);
229 if (tmp->type == diRun)
230 {
231 row = ME_FindItemBack(tmp, diStartRow);
232 pSizeRun = run = tmp;
233 assert(run);
234 assert(run->type == diRun);
235 sz = ME_GetRunSize(&c, &para->member.para,
236 &run->member.run, run->member.run.strText->nLen,
237 row->member.row.nLMargin);
238 }
239 }
240 if (pCursor->nOffset) {
241 sz = ME_GetRunSize(&c, &para->member.para, &run->member.run,
242 pCursor->nOffset, row->member.row.nLMargin);
243 }
244
245 *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
246 *x = c.rcView.left + run->member.run.pt.x + sz.cx - editor->horz_si.nPos;
247 *y = c.rcView.top + para->member.para.pt.y + row->member.row.nBaseline
248 + run->member.run.pt.y - pSizeRun->member.run.nAscent
249 - editor->vert_si.nPos;
250 ME_DestroyContext(&c);
251 return;
252 }
253
254
255 void
256 ME_MoveCaret(ME_TextEditor *editor)
257 {
258 int x, y, height;
259
260 ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
261 if(editor->bHaveFocus && !ME_IsSelection(editor))
262 {
263 x = min(x, editor->rcFormat.right-1);
264 ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
265 ITextHost_TxSetCaretPos(editor->texthost, x, y);
266 }
267 }
268
269
270 void ME_ShowCaret(ME_TextEditor *ed)
271 {
272 ME_MoveCaret(ed);
273 if(ed->bHaveFocus && !ME_IsSelection(ed))
274 ITextHost_TxShowCaret(ed->texthost, TRUE);
275 }
276
277 void ME_HideCaret(ME_TextEditor *ed)
278 {
279 if(!ed->bHaveFocus || ME_IsSelection(ed))
280 {
281 ITextHost_TxShowCaret(ed->texthost, FALSE);
282 DestroyCaret();
283 }
284 }
285
286 BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
287 int nChars, BOOL bForce)
288 {
289 ME_Cursor c = *start;
290 int nOfs = ME_GetCursorOfs(start);
291 int shift = 0;
292 int totalChars = nChars;
293 ME_DisplayItem *start_para;
294
295 /* Prevent deletion past last end of paragraph run. */
296 nChars = min(nChars, ME_GetTextLength(editor) - nOfs);
297 start_para = c.pPara;
298
299 if (!bForce)
300 {
301 ME_ProtectPartialTableDeletion(editor, &c, &nChars);
302 if (nChars == 0)
303 return FALSE;
304 }
305
306 while(nChars > 0)
307 {
308 ME_Run *run;
309 ME_CursorFromCharOfs(editor, nOfs+nChars, &c);
310 if (!c.nOffset &&
311 nOfs+nChars == (c.pRun->member.run.nCharOfs
312 + c.pPara->member.para.nCharOfs))
313 {
314 /* We aren't deleting anything in this run, so we will go back to the
315 * last run we are deleting text in. */
316 ME_PrevRun(&c.pPara, &c.pRun);
317 c.nOffset = c.pRun->member.run.strText->nLen;
318 }
319 run = &c.pRun->member.run;
320 if (run->nFlags & MERF_ENDPARA) {
321 int eollen = c.pRun->member.run.strText->nLen;
322 BOOL keepFirstParaFormat;
323
324 if (!ME_FindItemFwd(c.pRun, diParagraph))
325 {
326 return TRUE;
327 }
328 keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
329 run->nCharOfs);
330 if (!editor->bEmulateVersion10) /* v4.1 */
331 {
332 ME_DisplayItem *next_para = ME_FindItemFwd(c.pRun, diParagraphOrEnd);
333 ME_DisplayItem *this_para = next_para->member.para.prev_para;
334
335 /* The end of paragraph before a table row is only deleted if there
336 * is nothing else on the line before it. */
337 if (this_para == start_para &&
338 next_para->member.para.nFlags & MEPF_ROWSTART)
339 {
340 /* If the paragraph will be empty, then it should be deleted, however
341 * it still might have text right now which would inherit the
342 * MEPF_STARTROW property if we joined it right now.
343 * Instead we will delete it after the preceding text is deleted. */
344 if (nOfs > this_para->member.para.nCharOfs) {
345 /* Skip this end of line. */
346 nChars -= (eollen < nChars) ? eollen : nChars;
347 continue;
348 }
349 keepFirstParaFormat = TRUE;
350 }
351 }
352 ME_JoinParagraphs(editor, c.pPara, keepFirstParaFormat);
353 /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
354 ME_CheckCharOffsets(editor);
355 nChars -= (eollen < nChars) ? eollen : nChars;
356 continue;
357 }
358 else
359 {
360 ME_Cursor cursor;
361 int nCharsToDelete = min(nChars, c.nOffset);
362 int i;
363
364 c.nOffset -= nCharsToDelete;
365
366 ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
367
368 cursor = c;
369 /* nChars is the number of characters that should be deleted from the
370 PRECEDING runs (these BEFORE cursor.pRun)
371 nCharsToDelete is a number of chars to delete from THIS run */
372 nChars -= nCharsToDelete;
373 shift -= nCharsToDelete;
374 TRACE("Deleting %d (remaning %d) chars at %d in '%s' (%d)\n",
375 nCharsToDelete, nChars, c.nOffset,
376 debugstr_w(run->strText->szData), run->strText->nLen);
377
378 if (!c.nOffset && run->strText->nLen == nCharsToDelete)
379 {
380 /* undo = reinsert whole run */
381 /* nOfs is a character offset (from the start of the document
382 to the current (deleted) run */
383 ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
384 if (pUndo)
385 pUndo->di.member.run.nCharOfs = nOfs+nChars;
386 }
387 else
388 {
389 /* undo = reinsert partial run */
390 ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
391 if (pUndo) {
392 ME_DestroyString(pUndo->di.member.run.strText);
393 pUndo->di.member.run.nCharOfs = nOfs+nChars;
394 pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
395 }
396 }
397 TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
398 TRACE("Shift value: %d\n", shift);
399 ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
400
401 /* update cursors (including c) */
402 for (i=-1; i<editor->nCursors; i++) {
403 ME_Cursor *pThisCur = editor->pCursors + i;
404 if (i == -1) pThisCur = &c;
405 if (pThisCur->pRun == cursor.pRun) {
406 if (pThisCur->nOffset > cursor.nOffset) {
407 if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
408 pThisCur->nOffset = cursor.nOffset;
409 else
410 pThisCur->nOffset -= nCharsToDelete;
411 assert(pThisCur->nOffset >= 0);
412 assert(pThisCur->nOffset <= run->strText->nLen);
413 }
414 if (pThisCur->nOffset == run->strText->nLen)
415 {
416 pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
417 assert(pThisCur->pRun->type == diRun);
418 pThisCur->nOffset = 0;
419 }
420 }
421 }
422
423 /* c = updated data now */
424
425 if (c.pRun == cursor.pRun)
426 ME_SkipAndPropagateCharOffset(c.pRun, shift);
427 else
428 ME_PropagateCharOffset(c.pRun, shift);
429
430 if (!cursor.pRun->member.run.strText->nLen)
431 {
432 TRACE("Removing useless run\n");
433 ME_Remove(cursor.pRun);
434 ME_DestroyDisplayItem(cursor.pRun);
435 }
436
437 shift = 0;
438 /*
439 ME_CheckCharOffsets(editor);
440 */
441 continue;
442 }
443 }
444 return TRUE;
445 }
446
447 BOOL ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, int nChars)
448 {
449 assert(nCursor>=0 && nCursor<editor->nCursors);
450 /* text operations set modified state */
451 editor->nModifyStep = 1;
452 return ME_InternalDeleteText(editor, &editor->pCursors[nCursor],
453 nChars, FALSE);
454 }
455
456 static ME_DisplayItem *
457 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
458 const WCHAR *str, int len, ME_Style *style,
459 int flags)
460 {
461 ME_Cursor *p = &editor->pCursors[nCursor];
462
463 editor->bCaretAtEnd = FALSE;
464
465 assert(p->pRun->type == diRun);
466
467 return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
468 }
469
470
471 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
472 {
473 ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
474 ME_DisplayItem *di;
475 WCHAR space = ' ';
476
477 /* FIXME no no no */
478 if (ME_IsSelection(editor))
479 ME_DeleteSelection(editor);
480
481 di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
482 MERF_GRAPHICS);
483 di->member.run.ole_obj = ALLOC_OBJ(*reo);
484 ME_CopyReObject(di->member.run.ole_obj, reo);
485 ME_ReleaseStyle(pStyle);
486 }
487
488
489 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
490 {
491 ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
492 ME_DisplayItem *di;
493 WCHAR space = ' ';
494
495 /* FIXME no no no */
496 if (ME_IsSelection(editor))
497 ME_DeleteSelection(editor);
498
499 di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
500 MERF_ENDROW);
501 ME_ReleaseStyle(pStyle);
502 }
503
504
505 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
506 const WCHAR *str, int len, ME_Style *style)
507 {
508 const WCHAR *pos;
509 ME_Cursor *p = NULL;
510 int oldLen;
511
512 /* FIXME really HERE ? */
513 if (ME_IsSelection(editor))
514 ME_DeleteSelection(editor);
515
516 /* FIXME: is this too slow? */
517 /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
518 oldLen = ME_GetTextLength(editor);
519
520 /* text operations set modified state */
521 editor->nModifyStep = 1;
522
523 assert(style);
524
525 assert(nCursor>=0 && nCursor<editor->nCursors);
526 if (len == -1)
527 len = lstrlenW(str);
528
529 /* grow the text limit to fit our text */
530 if(editor->nTextLimit < oldLen +len)
531 editor->nTextLimit = oldLen + len;
532
533 pos = str;
534
535 while (len)
536 {
537 /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
538 while(pos - str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
539 pos++;
540
541 if (pos != str) { /* handle text */
542 ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
543 } else if (*pos == '\t') { /* handle tabs */
544 WCHAR tab = '\t';
545 ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
546 pos++;
547 } else { /* handle EOLs */
548 ME_DisplayItem *tp, *end_run;
549 ME_Style *tmp_style;
550 int eol_len = 0;
551
552 /* Find number of CR and LF in end of paragraph run */
553 if (*pos =='\r')
554 {
555 if (len > 1 && pos[1] == '\n')
556 eol_len = 2;
557 else if (len > 2 && pos[1] == '\r' && pos[2] == '\n')
558 eol_len = 3;
559 else
560 eol_len = 1;
561 } else {
562 assert(*pos == '\n');
563 eol_len = 1;
564 }
565 pos += eol_len;
566
567 if (!editor->bEmulateVersion10 && eol_len == 3)
568 {
569 /* handle special \r\r\n sequence (richedit 2.x and higher only) */
570 WCHAR space = ' ';
571 ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
572 } else {
573 ME_String *eol_str;
574
575 if (!editor->bEmulateVersion10) {
576 WCHAR cr = '\r';
577 eol_str = ME_MakeStringN(&cr, 1);
578 } else {
579 eol_str = ME_MakeStringN(str, eol_len);
580 }
581
582 p = &editor->pCursors[nCursor];
583 if (p->nOffset) {
584 ME_SplitRunSimple(editor, p->pRun, p->nOffset);
585 p = &editor->pCursors[nCursor];
586 }
587 tmp_style = ME_GetInsertStyle(editor, nCursor);
588 /* ME_SplitParagraph increases style refcount */
589 tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, eol_str, 0);
590 p->pRun = ME_FindItemFwd(tp, diRun);
591 p->pPara = tp;
592 end_run = ME_FindItemBack(tp, diRun);
593 ME_ReleaseStyle(end_run->member.run.style);
594 end_run->member.run.style = tmp_style;
595 p->nOffset = 0;
596 }
597 }
598 len -= pos - str;
599 str = pos;
600 }
601 }
602
603 /* Move the cursor nRelOfs characters (either forwards or backwards)
604 *
605 * returns the actual number of characters moved.
606 **/
607 int ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
608 {
609 cursor->nOffset += nRelOfs;
610 if (cursor->nOffset < 0)
611 {
612 cursor->nOffset += cursor->pRun->member.run.nCharOfs;
613 if (cursor->nOffset >= 0)
614 {
615 /* new offset in the same paragraph */
616 do {
617 cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
618 } while (cursor->nOffset < cursor->pRun->member.run.nCharOfs);
619 cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
620 return nRelOfs;
621 }
622
623 cursor->nOffset += cursor->pPara->member.para.nCharOfs;
624 if (cursor->nOffset <= 0)
625 {
626 /* moved to the start of the text */
627 nRelOfs -= cursor->nOffset;
628 ME_SetCursorToStart(editor, cursor);
629 return nRelOfs;
630 }
631
632 /* new offset in a previous paragraph */
633 do {
634 cursor->pPara = cursor->pPara->member.para.prev_para;
635 } while (cursor->nOffset < cursor->pPara->member.para.nCharOfs);
636 cursor->nOffset -= cursor->pPara->member.para.nCharOfs;
637
638 cursor->pRun = ME_FindItemBack(cursor->pPara->member.para.next_para, diRun);
639 while (cursor->nOffset < cursor->pRun->member.run.nCharOfs) {
640 cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
641 }
642 cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
643 } else if (cursor->nOffset >= cursor->pRun->member.run.strText->nLen) {
644 ME_DisplayItem *next_para;
645 int new_offset;
646
647 new_offset = ME_GetCursorOfs(cursor);
648 next_para = cursor->pPara->member.para.next_para;
649 if (new_offset < next_para->member.para.nCharOfs)
650 {
651 /* new offset in the same paragraph */
652 do {
653 cursor->nOffset -= cursor->pRun->member.run.strText->nLen;
654 cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
655 } while (cursor->nOffset >= cursor->pRun->member.run.strText->nLen);
656 return nRelOfs;
657 }
658
659 if (new_offset >= ME_GetTextLength(editor))
660 {
661 /* new offset at the end of the text */
662 ME_SetCursorToEnd(editor, cursor);
663 nRelOfs -= new_offset - ME_GetTextLength(editor);
664 return nRelOfs;
665 }
666
667 /* new offset in a following paragraph */
668 do {
669 cursor->pPara = next_para;
670 next_para = next_para->member.para.next_para;
671 } while (new_offset >= next_para->member.para.nCharOfs);
672
673 cursor->nOffset = new_offset - cursor->pPara->member.para.nCharOfs;
674 cursor->pRun = ME_FindItemFwd(cursor->pPara, diRun);
675 while (cursor->nOffset >= cursor->pRun->member.run.strText->nLen)
676 {
677 cursor->nOffset -= cursor->pRun->member.run.strText->nLen;
678 cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
679 }
680 } /* else new offset is in the same run */
681 return nRelOfs;
682 }
683
684
685 static BOOL
686 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
687 {
688 ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
689 ME_DisplayItem *pPara = cursor->pPara;
690 int nOffset = cursor->nOffset;
691
692 if (nRelOfs == -1)
693 {
694 /* Backward movement */
695 while (TRUE)
696 {
697 nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
698 nOffset, WB_MOVEWORDLEFT);
699 if (nOffset)
700 break;
701 pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
702 if (pOtherRun->type == diRun)
703 {
704 if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
705 pOtherRun->member.run.strText->nLen - 1,
706 WB_ISDELIMITER)
707 && !(pRun->member.run.nFlags & MERF_ENDPARA)
708 && !(cursor->pRun == pRun && cursor->nOffset == 0)
709 && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
710 WB_ISDELIMITER))
711 break;
712 pRun = pOtherRun;
713 nOffset = pOtherRun->member.run.strText->nLen;
714 }
715 else if (pOtherRun->type == diParagraph)
716 {
717 if (cursor->pRun == pRun && cursor->nOffset == 0)
718 {
719 pPara = pOtherRun;
720 /* Skip empty start of table row paragraph */
721 if (pPara->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
722 pPara = pPara->member.para.prev_para;
723 /* Paragraph breaks are treated as separate words */
724 if (pPara->member.para.prev_para->type == diTextStart)
725 return FALSE;
726
727 pRun = ME_FindItemBack(pPara, diRun);
728 pPara = pPara->member.para.prev_para;
729 }
730 break;
731 }
732 }
733 }
734 else
735 {
736 /* Forward movement */
737 BOOL last_delim = FALSE;
738
739 while (TRUE)
740 {
741 if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
742 nOffset, WB_ISDELIMITER))
743 break;
744 nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
745 nOffset, WB_MOVEWORDRIGHT);
746 if (nOffset < pRun->member.run.strText->nLen)
747 break;
748 pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
749 if (pOtherRun->type == diRun)
750 {
751 last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
752 nOffset - 1, WB_ISDELIMITER);
753 pRun = pOtherRun;
754 nOffset = 0;
755 }
756 else if (pOtherRun->type == diParagraph)
757 {
758 if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
759 pOtherRun = pOtherRun->member.para.next_para;
760 if (cursor->pRun == pRun) {
761 pPara = pOtherRun;
762 pRun = ME_FindItemFwd(pPara, diRun);
763 }
764 nOffset = 0;
765 break;
766 }
767 else /* diTextEnd */
768 {
769 if (cursor->pRun == pRun)
770 return FALSE;
771 nOffset = 0;
772 break;
773 }
774 }
775 }
776 cursor->pPara = pPara;
777 cursor->pRun = pRun;
778 cursor->nOffset = nOffset;
779 return TRUE;
780 }
781
782
783 static void
784 ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
785 {
786 /* pCursor[0] is the end of the selection
787 * pCursor[1] is the start of the selection (or the position selection anchor)
788 * pCursor[2] and [3] are the selection anchors that are backed up
789 * so they are kept when the selection changes for drag selection.
790 */
791
792 editor->nSelectionType = selectionType;
793 switch(selectionType)
794 {
795 case stPosition:
796 break;
797 case stWord:
798 ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
799 editor->pCursors[1] = editor->pCursors[0];
800 ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
801 break;
802 case stLine:
803 case stParagraph:
804 {
805 ME_DisplayItem *pItem;
806 ME_DIType fwdSearchType, backSearchType;
807 if (selectionType == stParagraph) {
808 backSearchType = diParagraph;
809 fwdSearchType = diParagraphOrEnd;
810 } else {
811 backSearchType = diStartRow;
812 fwdSearchType = diStartRowOrParagraphOrEnd;
813 }
814 pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
815 assert(pItem);
816 if (pItem->type == diTextEnd)
817 editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
818 else
819 editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
820 editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
821 editor->pCursors[0].nOffset = 0;
822
823 pItem = ME_FindItemBack(pItem, backSearchType);
824 editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
825 editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
826 editor->pCursors[1].nOffset = 0;
827 break;
828 }
829 case stDocument:
830 /* Select everything with cursor anchored from the start of the text */
831 editor->nSelectionType = stDocument;
832 ME_SetCursorToStart(editor, &editor->pCursors[1]);
833 ME_SetCursorToEnd(editor, &editor->pCursors[0]);
834 break;
835 default: assert(0);
836 }
837 /* Store the anchor positions for extending the selection. */
838 editor->pCursors[2] = editor->pCursors[0];
839 editor->pCursors[3] = editor->pCursors[1];
840 }
841
842 int ME_GetCursorOfs(const ME_Cursor *cursor)
843 {
844 return cursor->pPara->member.para.nCharOfs
845 + cursor->pRun->member.run.nCharOfs + cursor->nOffset;
846 }
847
848 /* Helper function for ME_FindPixelPos to find paragraph within tables */
849 static ME_DisplayItem* ME_FindPixelPosInTableRow(int x, int y,
850 ME_DisplayItem *para)
851 {
852 ME_DisplayItem *cell, *next_cell;
853 assert(para->member.para.nFlags & MEPF_ROWSTART);
854 cell = para->member.para.next_para->member.para.pCell;
855 assert(cell);
856
857 /* find the cell we are in */
858 while ((next_cell = cell->member.cell.next_cell) != NULL) {
859 if (x < next_cell->member.cell.pt.x)
860 {
861 para = ME_FindItemFwd(cell, diParagraph);
862 /* Found the cell, but there might be multiple paragraphs in
863 * the cell, so need to search down the cell for the paragraph. */
864 while (cell == para->member.para.pCell) {
865 if (y < para->member.para.pt.y + para->member.para.nHeight)
866 {
867 if (para->member.para.nFlags & MEPF_ROWSTART)
868 return ME_FindPixelPosInTableRow(x, y, para);
869 else
870 return para;
871 }
872 para = para->member.para.next_para;
873 }
874 /* Past the end of the cell, so go back to the last cell paragraph */
875 return para->member.para.prev_para;
876 }
877 cell = next_cell;
878 }
879 /* Return table row delimiter */
880 para = ME_FindItemFwd(cell, diParagraph);
881 assert(para->member.para.nFlags & MEPF_ROWEND);
882 assert(para->member.para.pFmt->dwMask & PFM_TABLEROWDELIMITER);
883 assert(para->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER);
884 return para;
885 }
886
887 static BOOL ME_ReturnFoundPos(ME_TextEditor *editor, ME_DisplayItem *found,
888 ME_Cursor *result, int rx, BOOL isExact)
889 {
890 assert(found);
891 assert(found->type == diRun);
892 if ((found->member.run.nFlags & MERF_ENDPARA) || rx < 0)
893 rx = 0;
894 result->pRun = found;
895 result->nOffset = ME_CharFromPointCursor(editor, rx, &found->member.run);
896 if (result->nOffset == found->member.run.strText->nLen && rx)
897 {
898 result->pRun = ME_FindItemFwd(result->pRun, diRun);
899 result->nOffset = 0;
900 }
901 result->pPara = ME_GetParagraph(result->pRun);
902 return isExact;
903 }
904
905 /* Finds the run and offset from the pixel position.
906 *
907 * x & y are pixel positions in virtual coordinates into the rich edit control,
908 * so client coordinates must first be adjusted by the scroll position.
909 *
910 * returns TRUE if the result was exactly under the cursor, otherwise returns
911 * FALSE, and result is set to the closest position to the coordinates.
912 */
913 static BOOL ME_FindPixelPos(ME_TextEditor *editor, int x, int y,
914 ME_Cursor *result, BOOL *is_eol)
915 {
916 ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
917 ME_DisplayItem *last = NULL;
918 int rx = 0;
919 BOOL isExact = TRUE;
920
921 x -= editor->rcFormat.left;
922 y -= editor->rcFormat.top;
923
924 if (is_eol)
925 *is_eol = 0;
926
927 /* find paragraph */
928 for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
929 {
930 assert(p->type == diParagraph);
931 if (y < p->member.para.pt.y + p->member.para.nHeight)
932 {
933 if (p->member.para.nFlags & MEPF_ROWSTART)
934 p = ME_FindPixelPosInTableRow(x, y, p);
935 y -= p->member.para.pt.y;
936 p = ME_FindItemFwd(p, diStartRow);
937 break;
938 } else if (p->member.para.nFlags & MEPF_ROWSTART) {
939 p = ME_GetTableRowEnd(p);
940 }
941 }
942 /* find row */
943 for (; p != editor->pBuffer->pLast; )
944 {
945 ME_DisplayItem *pp;
946 assert(p->type == diStartRow);
947 if (y < p->member.row.pt.y + p->member.row.nHeight)
948 {
949 p = ME_FindItemFwd(p, diRun);
950 break;
951 }
952 pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
953 if (pp->type != diStartRow)
954 {
955 p = ME_FindItemFwd(p, diRun);
956 break;
957 }
958 p = pp;
959 }
960 if (p == editor->pBuffer->pLast)
961 {
962 /* The position is below the last paragraph, so the last row will be used
963 * rather than the end of the text, so the x position will be used to
964 * determine the offset closest to the pixel position. */
965 isExact = FALSE;
966 p = ME_FindItemBack(p, diStartRow);
967 if (p != NULL){
968 p = ME_FindItemFwd(p, diRun);
969 }
970 else
971 {
972 p = editor->pBuffer->pLast;
973 }
974 }
975 for (; p != editor->pBuffer->pLast; p = p->next)
976 {
977 switch (p->type)
978 {
979 case diRun:
980 rx = x - p->member.run.pt.x;
981 if (rx < p->member.run.nWidth)
982 return ME_ReturnFoundPos(editor, p, result, rx, isExact);
983 break;
984 case diStartRow:
985 isExact = FALSE;
986 p = ME_FindItemFwd(p, diRun);
987 if (is_eol) *is_eol = 1;
988 rx = 0; /* FIXME not sure */
989 return ME_ReturnFoundPos(editor, p, result, rx, isExact);
990 case diCell:
991 case diParagraph:
992 case diTextEnd:
993 isExact = FALSE;
994 rx = 0; /* FIXME not sure */
995 p = last;
996 return ME_ReturnFoundPos(editor, p, result, rx, isExact);
997 default: assert(0);
998 }
999 last = p;
1000 }
1001 result->pRun = ME_FindItemBack(p, diRun);
1002 result->pPara = ME_GetParagraph(result->pRun);
1003 result->nOffset = 0;
1004 assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
1005 return FALSE;
1006 }
1007
1008
1009 /* Sets the cursor to the position closest to the pixel position
1010 *
1011 * x & y are pixel positions in client coordinates.
1012 *
1013 * isExact will be set to TRUE if the run is directly under the pixel
1014 * position, FALSE if it not, unless isExact is set to NULL.
1015 *
1016 * return FALSE if outside client area and the cursor is not set,
1017 * otherwise TRUE is returned.
1018 */
1019 BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y,
1020 ME_Cursor *cursor, BOOL *isExact)
1021 {
1022 RECT rc;
1023 BOOL bResult;
1024
1025 ITextHost_TxGetClientRect(editor->texthost, &rc);
1026 if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
1027 if (isExact) *isExact = FALSE;
1028 return FALSE;
1029 }
1030 x += editor->horz_si.nPos;
1031 y += editor->vert_si.nPos;
1032 bResult = ME_FindPixelPos(editor, x, y, cursor, NULL);
1033 if (isExact) *isExact = bResult;
1034 return TRUE;
1035 }
1036
1037
1038
1039 /* Extends the selection with a word, line, or paragraph selection type.
1040 *
1041 * The selection is anchored by editor->pCursors[2-3] such that the text
1042 * between the anchors will remain selected, and one end will be extended.
1043 *
1044 * editor->pCursors[0] should have the position to extend the selection to
1045 * before this function is called.
1046 *
1047 * Nothing will be done if editor->nSelectionType equals stPosition.
1048 */
1049 static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
1050 {
1051 ME_Cursor tmp_cursor;
1052 int curOfs, anchorStartOfs, anchorEndOfs;
1053 if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
1054 return;
1055 curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
1056 anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
1057 anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
1058
1059 tmp_cursor = editor->pCursors[0];
1060 editor->pCursors[0] = editor->pCursors[2];
1061 editor->pCursors[1] = editor->pCursors[3];
1062 if (curOfs < anchorStartOfs)
1063 {
1064 /* Extend the left side of selection */
1065 editor->pCursors[1] = tmp_cursor;
1066 if (editor->nSelectionType == stWord)
1067 ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
1068 else
1069 {
1070 ME_DisplayItem *pItem;
1071 ME_DIType searchType = ((editor->nSelectionType == stLine) ?
1072 diStartRowOrParagraph:diParagraph);
1073 pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
1074 editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
1075 editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
1076 editor->pCursors[1].nOffset = 0;
1077 }
1078 }
1079 else if (curOfs >= anchorEndOfs)
1080 {
1081 /* Extend the right side of selection */
1082 editor->pCursors[0] = tmp_cursor;
1083 if (editor->nSelectionType == stWord)
1084 ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
1085 else
1086 {
1087 ME_DisplayItem *pItem;
1088 ME_DIType searchType = ((editor->nSelectionType == stLine) ?
1089 diStartRowOrParagraphOrEnd:diParagraphOrEnd);
1090 pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
1091 if (pItem->type == diTextEnd)
1092 editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
1093 else
1094 editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
1095 editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
1096 editor->pCursors[0].nOffset = 0;
1097 }
1098 }
1099 }
1100
1101 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1102 {
1103 ME_Cursor tmp_cursor;
1104 int is_selection = 0;
1105 BOOL is_shift;
1106
1107 editor->nUDArrowX = -1;
1108
1109 x += editor->horz_si.nPos;
1110 y += editor->vert_si.nPos;
1111
1112 tmp_cursor = editor->pCursors[0];
1113 is_selection = ME_IsSelection(editor);
1114 is_shift = GetKeyState(VK_SHIFT) < 0;
1115
1116 ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
1117
1118 if (x >= editor->rcFormat.left || is_shift)
1119 {
1120 if (clickNum > 1)
1121 {
1122 editor->pCursors[1] = editor->pCursors[0];
1123 if (is_shift) {
1124 if (x >= editor->rcFormat.left)
1125 ME_SelectByType(editor, stWord);
1126 else
1127 ME_SelectByType(editor, stParagraph);
1128 } else if (clickNum % 2 == 0) {
1129 ME_SelectByType(editor, stWord);
1130 } else {
1131 ME_SelectByType(editor, stParagraph);
1132 }
1133 }
1134 else if (!is_shift)
1135 {
1136 editor->nSelectionType = stPosition;
1137 editor->pCursors[1] = editor->pCursors[0];
1138 }
1139 else if (!is_selection)
1140 {
1141 editor->nSelectionType = stPosition;
1142 editor->pCursors[1] = tmp_cursor;
1143 }
1144 else if (editor->nSelectionType != stPosition)
1145 {
1146 ME_ExtendAnchorSelection(editor);
1147 }
1148 }
1149 else
1150 {
1151 if (clickNum < 2) {
1152 ME_SelectByType(editor, stLine);
1153 } else if (clickNum % 2 == 0 || is_shift) {
1154 ME_SelectByType(editor, stParagraph);
1155 } else {
1156 ME_SelectByType(editor, stDocument);
1157 }
1158 }
1159 ME_InvalidateSelection(editor);
1160 ITextHost_TxShowCaret(editor->texthost, FALSE);
1161 ME_ShowCaret(editor);
1162 ME_ClearTempStyle(editor);
1163 ME_SendSelChange(editor);
1164 }
1165
1166 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
1167 {
1168 ME_Cursor tmp_cursor;
1169
1170 if (editor->nSelectionType == stDocument)
1171 return;
1172 x += editor->horz_si.nPos;
1173 y += editor->vert_si.nPos;
1174
1175 tmp_cursor = editor->pCursors[0];
1176 /* FIXME: do something with the return value of ME_FindPixelPos */
1177 ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1178
1179 ME_InvalidateSelection(editor);
1180 editor->pCursors[0] = tmp_cursor;
1181 ME_ExtendAnchorSelection(editor);
1182
1183 if (editor->nSelectionType != stPosition &&
1184 memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1185 {
1186 /* The scroll the cursor towards the other end, since it was the one
1187 * extended by ME_ExtendAnchorSelection */
1188 ME_EnsureVisible(editor, &editor->pCursors[1]);
1189 } else {
1190 ME_EnsureVisible(editor, &editor->pCursors[0]);
1191 }
1192
1193 ME_InvalidateSelection(editor);
1194 ITextHost_TxShowCaret(editor->texthost, FALSE);
1195 ME_ShowCaret(editor);
1196 ME_SendSelChange(editor);
1197 }
1198
1199 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
1200 int x, int *pOffset, int *pbCaretAtEnd)
1201 {
1202 ME_DisplayItem *pNext, *pLastRun;
1203 pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
1204 assert(pNext->type == diRun);
1205 pLastRun = pNext;
1206 if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
1207 if (pOffset) *pOffset = 0;
1208 do {
1209 int run_x = pNext->member.run.pt.x;
1210 int width = pNext->member.run.nWidth;
1211 if (x < run_x)
1212 {
1213 return pNext;
1214 }
1215 if (x >= run_x && x < run_x+width)
1216 {
1217 int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
1218 ME_String *s = pNext->member.run.strText;
1219 if (ch < s->nLen) {
1220 if (pOffset)
1221 *pOffset = ch;
1222 return pNext;
1223 }
1224 }
1225 pLastRun = pNext;
1226 pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
1227 } while(pNext && pNext->type == diRun);
1228
1229 if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
1230 {
1231 pNext = ME_FindItemFwd(pNext, diRun);
1232 if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
1233 return pNext;
1234 } else {
1235 return pLastRun;
1236 }
1237 }
1238
1239 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1240 {
1241 ME_DisplayItem *pRun = pCursor->pRun;
1242 int x;
1243
1244 if (editor->nUDArrowX != -1)
1245 x = editor->nUDArrowX;
1246 else {
1247 if (editor->bCaretAtEnd)
1248 {
1249 pRun = ME_FindItemBack(pRun, diRun);
1250 assert(pRun);
1251 x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1252 }
1253 else {
1254 x = pRun->member.run.pt.x;
1255 x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
1256 }
1257 editor->nUDArrowX = x;
1258 }
1259 return x;
1260 }
1261
1262
1263 static void
1264 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1265 {
1266 ME_DisplayItem *pRun = pCursor->pRun;
1267 ME_DisplayItem *pOldPara = pCursor->pPara;
1268 ME_DisplayItem *pItem, *pNewPara;
1269 int x = ME_GetXForArrow(editor, pCursor);
1270
1271 if (editor->bCaretAtEnd && !pCursor->nOffset)
1272 if (!ME_PrevRun(&pOldPara, &pRun))
1273 return;
1274
1275 if (nRelOfs == -1)
1276 {
1277 /* start of this row */
1278 pItem = ME_FindItemBack(pRun, diStartRow);
1279 assert(pItem);
1280 /* start of the previous row */
1281 pItem = ME_FindItemBack(pItem, diStartRow);
1282 if (!pItem)
1283 return; /* row not found - ignore */
1284 pNewPara = ME_GetParagraph(pItem);
1285 if (pOldPara->member.para.nFlags & MEPF_ROWEND ||
1286 (pOldPara->member.para.pCell &&
1287 pOldPara->member.para.pCell != pNewPara->member.para.pCell))
1288 {
1289 /* Brought out of a cell */
1290 pNewPara = ME_GetTableRowStart(pOldPara)->member.para.prev_para;
1291 if (pNewPara->type == diTextStart)
1292 return; /* At the top, so don't go anywhere. */
1293 pItem = ME_FindItemFwd(pNewPara, diStartRow);
1294 }
1295 if (pNewPara->member.para.nFlags & MEPF_ROWEND)
1296 {
1297 /* Brought into a table row */
1298 ME_Cell *cell = &ME_FindItemBack(pNewPara, diCell)->member.cell;
1299 while (x < cell->pt.x && cell->prev_cell)
1300 cell = &cell->prev_cell->member.cell;
1301 if (cell->next_cell) /* else - we are still at the end of the row */
1302 pItem = ME_FindItemBack(cell->next_cell, diStartRow);
1303 }
1304 }
1305 else
1306 {
1307 /* start of the next row */
1308 pItem = ME_FindItemFwd(pRun, diStartRow);
1309 if (!pItem)
1310 return; /* row not found - ignore */
1311 pNewPara = ME_GetParagraph(pItem);
1312 if (pOldPara->member.para.nFlags & MEPF_ROWSTART ||
1313 (pOldPara->member.para.pCell &&
1314 pOldPara->member.para.pCell != pNewPara->member.para.pCell))
1315 {
1316 /* Brought out of a cell */
1317 pNewPara = ME_GetTableRowEnd(pOldPara)->member.para.next_para;
1318 if (pNewPara->type == diTextEnd)
1319 return; /* At the bottom, so don't go anywhere. */
1320 pItem = ME_FindItemFwd(pNewPara, diStartRow);
1321 }
1322 if (pNewPara->member.para.nFlags & MEPF_ROWSTART)
1323 {
1324 /* Brought into a table row */
1325 ME_DisplayItem *cell = ME_FindItemFwd(pNewPara, diCell);
1326 while (cell->member.cell.next_cell &&
1327 x >= cell->member.cell.next_cell->member.cell.pt.x)
1328 cell = cell->member.cell.next_cell;
1329 pItem = ME_FindItemFwd(cell, diStartRow);
1330 }
1331 }
1332 if (!pItem)
1333 {
1334 /* row not found - ignore */
1335 return;
1336 }
1337 pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1338 pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1339 assert(pCursor->pRun);
1340 assert(pCursor->pRun->type == diRun);
1341 }
1342
1343 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1344 {
1345 ME_DisplayItem *p = ME_FindItemFwd(editor->pBuffer->pFirst, diStartRow);
1346
1347 if (editor->vert_si.nPos < p->member.row.nHeight)
1348 {
1349 ME_SetCursorToStart(editor, pCursor);
1350 editor->bCaretAtEnd = FALSE;
1351 /* Native clears seems to clear this x value on page up at the top
1352 * of the text, but not on page down at the end of the text.
1353 * Doesn't make sense, but we try to be bug for bug compatible. */
1354 editor->nUDArrowX = -1;
1355 } else {
1356 ME_DisplayItem *pRun = pCursor->pRun;
1357 ME_DisplayItem *pLast;
1358 int x, y, ys, yd, yp, yprev;
1359 int yOldScrollPos = editor->vert_si.nPos;
1360
1361 x = ME_GetXForArrow(editor, pCursor);
1362 if (!pCursor->nOffset && editor->bCaretAtEnd)
1363 pRun = ME_FindItemBack(pRun, diRun);
1364
1365 p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1366 assert(p->type == diStartRow);
1367 yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1368 yprev = ys = y = yp + p->member.row.pt.y;
1369
1370 ME_ScrollUp(editor, editor->sizeWindow.cy);
1371 /* Only move the cursor by the amount scrolled. */
1372 yd = y + editor->vert_si.nPos - yOldScrollPos;
1373 pLast = p;
1374
1375 do {
1376 p = ME_FindItemBack(p, diStartRowOrParagraph);
1377 if (!p)
1378 break;
1379 if (p->type == diParagraph) { /* crossing paragraphs */
1380 if (p->member.para.prev_para == NULL)
1381 break;
1382 yp = p->member.para.prev_para->member.para.pt.y;
1383 continue;
1384 }
1385 y = yp + p->member.row.pt.y;
1386 if (y < yd)
1387 break;
1388 pLast = p;
1389 yprev = y;
1390 } while(1);
1391
1392 pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
1393 &editor->bCaretAtEnd);
1394 pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1395 }
1396 assert(pCursor->pRun);
1397 assert(pCursor->pRun->type == diRun);
1398 }
1399
1400 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1401 {
1402 ME_DisplayItem *pLast;
1403 int x, y;
1404
1405 /* Find y position of the last row */
1406 pLast = editor->pBuffer->pLast;
1407 y = pLast->member.para.prev_para->member.para.pt.y
1408 + ME_FindItemBack(pLast, diStartRow)->member.row.pt.y;
1409
1410 x = ME_GetXForArrow(editor, pCursor);
1411
1412 if (editor->vert_si.nPos >= y - editor->sizeWindow.cy)
1413 {
1414 ME_SetCursorToEnd(editor, pCursor);
1415 editor->bCaretAtEnd = FALSE;
1416 } else {
1417 ME_DisplayItem *pRun = pCursor->pRun;
1418 ME_DisplayItem *p;
1419 int ys, yd, yp, yprev;
1420 int yOldScrollPos = editor->vert_si.nPos;
1421
1422 if (!pCursor->nOffset && editor->bCaretAtEnd)
1423 pRun = ME_FindItemBack(pRun, diRun);
1424
1425 p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1426 assert(p->type == diStartRow);
1427 yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1428 yprev = ys = y = yp + p->member.row.pt.y;
1429
1430 /* For native richedit controls:
1431 * v1.0 - v3.1 can only scroll down as far as the scrollbar lets us
1432 * v4.1 can scroll past this position here. */
1433 ME_ScrollDown(editor, editor->sizeWindow.cy);
1434 /* Only move the cursor by the amount scrolled. */
1435 yd = y + editor->vert_si.nPos - yOldScrollPos;
1436 pLast = p;
1437
1438 do {
1439 p = ME_FindItemFwd(p, diStartRowOrParagraph);
1440 if (!p)
1441 break;
1442 if (p->type == diParagraph) {
1443 yp = p->member.para.pt.y;
1444 continue;
1445 }
1446 y = yp + p->member.row.pt.y;
1447 if (y >= yd)
1448 break;
1449 pLast = p;
1450 yprev = y;
1451 } while(1);
1452
1453 pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
1454 &editor->bCaretAtEnd);
1455 pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1456 }
1457 assert(pCursor->pRun);
1458 assert(pCursor->pRun->type == diRun);
1459 }
1460
1461 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1462 {
1463 ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1464 if (pRow) {
1465 ME_DisplayItem *pRun;
1466 if (editor->bCaretAtEnd && !pCursor->nOffset) {
1467 pRow = ME_FindItemBack(pRow, diStartRow);
1468 if (!pRow)
1469 return;
1470 }
1471 pRun = ME_FindItemFwd(pRow, diRun);
1472 if (pRun) {
1473 pCursor->pRun = pRun;
1474 assert(pCursor->pPara == ME_GetParagraph(pRun));
1475 pCursor->nOffset = 0;
1476 }
1477 }
1478 editor->bCaretAtEnd = FALSE;
1479 }
1480
1481 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1482 {
1483 ME_SetCursorToStart(editor, pCursor);
1484 editor->bCaretAtEnd = FALSE;
1485 }
1486
1487 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1488 {
1489 ME_DisplayItem *pRow;
1490
1491 if (editor->bCaretAtEnd && !pCursor->nOffset)
1492 return;
1493
1494 pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1495 assert(pRow);
1496 if (pRow->type == diStartRow) {
1497 ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1498 assert(pRun);
1499 pCursor->pRun = pRun;
1500 assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1501 pCursor->nOffset = 0;
1502 editor->bCaretAtEnd = TRUE;
1503 return;
1504 }
1505 pCursor->pRun = ME_FindItemBack(pRow, diRun);
1506 assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1507 assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1508 pCursor->nOffset = 0;
1509 editor->bCaretAtEnd = FALSE;
1510 }
1511
1512 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1513 {
1514 ME_SetCursorToEnd(editor, pCursor);
1515 editor->bCaretAtEnd = FALSE;
1516 }
1517
1518 BOOL ME_IsSelection(ME_TextEditor *editor)
1519 {
1520 return editor->pCursors[0].pRun != editor->pCursors[1].pRun ||
1521 editor->pCursors[0].nOffset != editor->pCursors[1].nOffset;
1522 }
1523
1524 void ME_DeleteSelection(ME_TextEditor *editor)
1525 {
1526 int from, to;
1527 int nStartCursor = ME_GetSelectionOfs(editor, &from, &to);
1528 ME_DeleteTextAtCursor(editor, nStartCursor, to - from);
1529 }
1530
1531 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1532 {
1533 return ME_GetInsertStyle(editor, 0);
1534 }
1535
1536 void ME_SendSelChange(ME_TextEditor *editor)
1537 {
1538 SELCHANGE sc;
1539
1540 if (!(editor->nEventMask & ENM_SELCHANGE))
1541 return;
1542
1543 sc.nmhdr.hwndFrom = NULL;
1544 sc.nmhdr.idFrom = 0;
1545 sc.nmhdr.code = EN_SELCHANGE;
1546 ME_GetSelectionOfs(editor, &sc.chrg.cpMin, &sc.chrg.cpMax);
1547 sc.seltyp = SEL_EMPTY;
1548 if (sc.chrg.cpMin != sc.chrg.cpMax)
1549 sc.seltyp |= SEL_TEXT;
1550 if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* what were RICHEDIT authors thinking ? */
1551 sc.seltyp |= SEL_MULTICHAR;
1552 TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1553 sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1554 (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1555 (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1556 if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1557 {
1558 ME_ClearTempStyle(editor);
1559
1560 editor->notified_cr = sc.chrg;
1561 ITextHost_TxNotify(editor->texthost, sc.nmhdr.code, &sc);
1562 }
1563 }
1564
1565 BOOL
1566 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1567 {
1568 int nCursor = 0;
1569 ME_Cursor *p = &editor->pCursors[nCursor];
1570 ME_Cursor tmp_curs = *p;
1571 BOOL success = FALSE;
1572
1573 ME_CheckCharOffsets(editor);
1574 switch(nVKey) {
1575 case VK_LEFT:
1576 editor->bCaretAtEnd = 0;
1577 if (ctrl)
1578 success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1579 else
1580 success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1581 break;
1582 case VK_RIGHT:
1583 editor->bCaretAtEnd = 0;
1584 if (ctrl)
1585 success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1586 else
1587 success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1588 break;
1589 case VK_UP:
1590 ME_MoveCursorLines(editor, &tmp_curs, -1);
1591 break;
1592 case VK_DOWN:
1593 ME_MoveCursorLines(editor, &tmp_curs, +1);
1594 break;
1595 case VK_PRIOR:
1596 ME_ArrowPageUp(editor, &tmp_curs);
1597 break;
1598 case VK_NEXT:
1599 ME_ArrowPageDown(editor, &tmp_curs);
1600 break;
1601 case VK_HOME: {
1602 if (ctrl)
1603 ME_ArrowCtrlHome(editor, &tmp_curs);
1604 else
1605 ME_ArrowHome(editor, &tmp_curs);
1606 editor->bCaretAtEnd = 0;
1607 break;
1608 }
1609 case VK_END:
1610 if (ctrl)
1611 ME_ArrowCtrlEnd(editor, &tmp_curs);
1612 else
1613 ME_ArrowEnd(editor, &tmp_curs);
1614 break;
1615 }
1616
1617 if (!extend)
1618 editor->pCursors[1] = tmp_curs;
1619 *p = tmp_curs;
1620
1621 ME_InvalidateSelection(editor);
1622 ME_Repaint(editor);
1623 ITextHost_TxShowCaret(editor->texthost, FALSE);
1624 ME_EnsureVisible(editor, &tmp_curs);
1625 ME_ShowCaret(editor);
1626 ME_SendSelChange(editor);
1627 return success;
1628 }