2 * RichEdit - Paragraph wrapping. Don't try to understand it. You've been
5 * Copyright 2004 by Krzysztof Foltman
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.
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.
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
25 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
30 * - center and right align in WordPad omits all spaces at the start, we don't
31 * - objects/images are not handled yet
35 static ME_DisplayItem *ME_MakeRow(int height, int baseline, int width)
37 ME_DisplayItem *item = ME_MakeDI(diStartRow);
39 item->member.row.nHeight = height;
40 item->member.row.nBaseline = baseline;
41 item->member.row.nWidth = width;
45 static void ME_BeginRow(ME_WrapContext *wc)
48 wc->bOverflown = FALSE;
49 wc->pLastSplittableRun = NULL;
50 if (wc->context->editor->bWordWrap)
51 wc->nAvailWidth = wc->context->rcView.right - wc->context->rcView.left -
52 (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
54 wc->nAvailWidth = ~0u >> 1;
58 static void ME_InsertRowStart(ME_WrapContext *wc, const ME_DisplayItem *pEnd)
60 ME_DisplayItem *p, *row, *para;
61 BOOL bSkippingSpaces = TRUE;
62 int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
64 para = ME_GetParagraph(wc->pRowStart);
66 for (p = pEnd->prev; p!=wc->pRowStart->prev; p = p->prev)
68 /* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
69 if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
70 if (p->member.run.nAscent>ascent)
71 ascent = p->member.run.nAscent;
72 if (p->member.run.nDescent>descent)
73 descent = p->member.run.nDescent;
76 /* Exclude space characters from run width.
77 * Other whitespace or delimiters are not treated this way. */
79 int len = p->member.run.strText->nLen;
80 WCHAR *text = p->member.run.strText->szData + len - 1;
83 while (len && *(text--) == ' ')
87 if (len == p->member.run.strText->nLen)
89 width += p->member.run.nWidth;
91 sz = ME_GetRunSize(wc->context, ¶->member.para,
92 &p->member.run, len, p->member.run.pt.x);
96 bSkippingSpaces = !len;
97 } else if (!(p->member.run.nFlags & MERF_ENDPARA))
98 width += p->member.run.nWidth;
102 row = ME_MakeRow(ascent+descent, ascent, width);
103 row->member.row.nYPos = wc->pt.y;
104 row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
105 row->member.row.nRMargin = wc->nRightMargin;
106 assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
107 align = para->member.para.pFmt->wAlignment;
108 if (align == PFA_CENTER)
109 shift = (wc->nAvailWidth-width)/2;
110 if (align == PFA_RIGHT)
111 shift = wc->nAvailWidth-width;
112 for (p = wc->pRowStart; p!=pEnd; p = p->next)
114 if (p->type==diRun) { /* FIXME add more run types */
115 p->member.run.pt.x += row->member.row.nLMargin+shift;
118 ME_InsertBefore(wc->pRowStart, row);
120 wc->pt.y += ascent+descent;
124 static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
127 ME_InsertRowStart(wc, p);
130 p = p->member.para.prev_para->next;
132 if (p->type == diParagraph || p->type == diTextEnd)
134 if (p->type == diRun)
136 ME_Run *run = &p->member.run;
137 TRACE("%s - (%d, %d)\n", debugstr_w(run->strText->szData), run->pt.x, run->pt.y);
144 static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
146 /* FIXME compose style (out of character and paragraph styles) here */
148 ME_UpdateRunFlags(wc->context->editor, &p->member.run);
150 ME_CalcRunExtent(wc->context, &ME_GetParagraph(p)->member.para,
151 wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
154 static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
156 ME_DisplayItem *pp, *piter = p;
160 j = ME_ReverseFindNonWhitespaceV(p->member.run.strText, i);
162 pp = ME_SplitRun(wc, piter, j);
163 wc->pt.x += piter->member.run.nWidth;
169 /* omit all spaces before split point */
170 while(piter != wc->pRowStart)
172 piter = ME_FindItemBack(piter, diRun);
173 if (piter->member.run.nFlags & MERF_WHITESPACE)
178 if (piter->member.run.nFlags & MERF_ENDWHITE)
180 j = ME_ReverseFindNonWhitespaceV(piter->member.run.strText, i);
181 pp = ME_SplitRun(wc, piter, i);
182 wc->pt = pp->member.run.pt;
185 /* this run is the end of spaces, so the run edge is a good point to split */
186 wc->pt = pp->member.run.pt;
187 wc->bOverflown = TRUE;
188 TRACE("Split point is: %s|%s\n", debugstr_w(piter->member.run.strText->szData), debugstr_w(pp->member.run.strText->szData));
191 wc->pt = piter->member.run.pt;
196 static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
198 ME_DisplayItem *piter = p, *pp;
200 ME_Run *run = &p->member.run;
202 idesp = i = ME_CharFromPoint(wc->context, loc, run);
203 len = ME_StrVLen(run->strText);
207 /* don't split words */
208 i = ME_ReverseFindWhitespaceV(run->strText, i);
209 pp = ME_MaximizeSplit(wc, p, i);
213 TRACE("Must backtrack to split at: %s\n", debugstr_w(p->member.run.strText->szData));
214 if (wc->pLastSplittableRun)
216 if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
218 wc->pt = wc->ptLastSplittableRun;
219 return wc->pLastSplittableRun;
221 else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
223 /* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
224 they serve no other purpose */
225 ME_UpdateRunFlags(wc->context->editor, run);
226 assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
228 piter = wc->pLastSplittableRun;
229 run = &piter->member.run;
230 len = ME_StrVLen(run->strText);
231 /* don't split words */
232 i = ME_ReverseFindWhitespaceV(run->strText, len);
234 i = ME_ReverseFindNonWhitespaceV(run->strText, len);
236 ME_DisplayItem *piter2 = ME_SplitRun(wc, piter, i);
237 wc->pt = piter2->member.run.pt;
240 /* splittable = must have whitespaces */
241 assert(0 == "Splittable, but no whitespaces");
245 /* restart from the first run beginning with spaces */
246 wc->pt = wc->ptLastSplittableRun;
247 return wc->pLastSplittableRun;
250 TRACE("Backtracking failed, trying desperate: %s\n", debugstr_w(p->member.run.strText->szData));
251 /* OK, no better idea, so assume we MAY split words if we can split at all*/
253 return ME_SplitRun(wc, piter, idesp);
255 if (wc->pRowStart && piter != wc->pRowStart)
257 /* don't need to break current run, because it's possible to split
259 wc->bOverflown = TRUE;
264 /* split point inside first character - no choice but split after that char */
266 int pos2 = ME_StrRelPos(run->strText, 0, &chars);
268 /* the run is more than 1 char, so we may split */
269 return ME_SplitRun(wc, piter, pos2);
271 /* the run is one char, can't split it */
276 static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
282 assert(p->type == diRun);
285 run = &p->member.run;
286 run->pt.x = wc->pt.x;
287 run->pt.y = wc->pt.y;
288 ME_WrapSizeRun(wc, p);
289 len = ME_StrVLen(run->strText);
291 if (wc->bOverflown) /* just skipping final whitespaces */
293 /* End paragraph run can't overflow to the next line by itself. */
294 if (run->nFlags & MERF_ENDPARA)
297 if (run->nFlags & MERF_WHITESPACE) {
298 p->member.run.nFlags |= MERF_SKIPPED;
299 wc->pt.x += run->nWidth;
300 /* skip runs consisting of only whitespaces */
304 if (run->nFlags & MERF_STARTWHITE) {
305 /* try to split the run at the first non-white char */
307 black = ME_FindNonWhitespaceV(run->strText, 0);
309 wc->bOverflown = FALSE;
310 pp = ME_SplitRun(wc, p, black);
311 p->member.run.nFlags |= MERF_SKIPPED;
312 ME_InsertRowStart(wc, pp);
316 /* black run: the row goes from pRowStart to the previous run */
317 ME_InsertRowStart(wc, p);
320 /* simply end the current row and move on to next one */
321 if (run->nFlags & MERF_ENDROW)
324 ME_InsertRowStart(wc, p);
328 /* will current run fit? */
329 if (wc->pt.x + run->nWidth > wc->nAvailWidth)
331 int loc = wc->nAvailWidth - wc->pt.x;
332 /* total white run ? */
333 if (run->nFlags & MERF_WHITESPACE) {
334 /* let the overflow logic handle it */
335 wc->bOverflown = TRUE;
338 /* TAB: we can split before */
339 if (run->nFlags & MERF_TAB) {
340 wc->bOverflown = TRUE;
343 /* graphics: we can split before, if run's width is smaller than row's width */
344 if ((run->nFlags & MERF_GRAPHICS) && run->nWidth <= wc->nAvailWidth) {
345 wc->bOverflown = TRUE;
348 /* can we separate out the last spaces ? (to use overflow logic later) */
349 if (run->nFlags & MERF_ENDWHITE)
351 /* we aren't sure if it's *really* necessary, it's a good start however */
352 int black = ME_ReverseFindNonWhitespaceV(run->strText, len);
353 ME_SplitRun(wc, p, black);
354 /* handle both parts again */
357 /* determine the split point by backtracking */
358 pp = ME_SplitByBacktracking(wc, p, loc);
359 if (pp == wc->pRowStart)
361 /* we have a row that starts with spaces, or a single large character
362 * which we cannot split. */
363 wc->pt.x += run->nWidth;
366 if (p != pp) /* found a suitable split point */
368 wc->bOverflown = TRUE;
371 /* we detected that it's best to split on start of this run */
375 /* not found anything - writing over margins is the only option left */
377 if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
378 || ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
380 wc->pLastSplittableRun = p;
381 wc->ptLastSplittableRun = wc->pt;
383 wc->pt.x += run->nWidth;
387 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp);
389 static void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp, DWORD beginofs) {
395 assert(tp->type == diParagraph);
396 if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
399 ME_PrepareParagraphForWrapping(c, tp);
402 /* wc.para_style = tp->member.para.style; */
404 wc.nFirstMargin = ME_twips2pointsX(c, tp->member.para.pFmt->dxStartIndent) + beginofs;
405 wc.nLeftMargin = wc.nFirstMargin + ME_twips2pointsX(c, tp->member.para.pFmt->dxOffset);
406 wc.nRightMargin = ME_twips2pointsX(c, tp->member.para.pFmt->dxRightIndent);
410 if (tp->member.para.pFmt->dwMask & PFM_SPACEBEFORE)
411 wc.pt.y += ME_twips2pointsY(c, tp->member.para.pFmt->dySpaceBefore);
412 if (tp->member.para.pFmt->dwMask & PFM_BORDER)
414 border = ME_GetParaBorderWidth(c->editor, tp->member.para.pFmt->wBorders);
415 if (tp->member.para.pFmt->wBorders & 1) {
416 wc.nFirstMargin += border;
417 wc.nLeftMargin += border;
419 if (tp->member.para.pFmt->wBorders & 2)
420 wc.nRightMargin -= border;
421 if (tp->member.para.pFmt->wBorders & 4)
425 linespace = ME_GetParaLineSpace(c, &tp->member.para);
428 for (p = tp->next; p!=tp->member.para.next_para; ) {
429 assert(p->type != diStartRow);
430 if (p->type == diRun) {
431 p = ME_WrapHandleRun(&wc, p);
434 if (wc.nRow && p == wc.pRowStart)
435 wc.pt.y += linespace;
437 ME_WrapEndParagraph(&wc, p);
438 if ((tp->member.para.pFmt->dwMask & PFM_BORDER) && (tp->member.para.pFmt->wBorders & 8))
440 if (tp->member.para.pFmt->dwMask & PFM_SPACEAFTER)
441 wc.pt.y += ME_twips2pointsY(c, tp->member.para.pFmt->dySpaceAfter);
443 tp->member.para.nFlags &= ~MEPF_REWRAP;
444 tp->member.para.nHeight = wc.pt.y;
445 tp->member.para.nRows = wc.nRow;
449 static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
450 ME_DisplayItem *p, *pRow;
452 /* remove all items that will be reinserted by paragraph wrapper anyway */
453 tp->member.para.nRows = 0;
454 for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
460 ME_DestroyDisplayItem(pRow);
466 /* join runs that can be joined, set up flags */
467 for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
470 case diStartRow: assert(0); break; /* should have deleted it */
472 while (p->next->type == diRun) { /* FIXME */
473 if (ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
474 ME_JoinRuns(c->editor, p);
480 p->member.run.nFlags &= ~MERF_CALCBYWRAP;
488 BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor) {
489 ME_DisplayItem *item;
491 BOOL bModified = FALSE;
495 ME_InitContext(&c, editor, GetDC(editor->hWnd));
497 item = editor->pBuffer->pFirst->next;
498 while(item != editor->pBuffer->pLast) {
499 BOOL bRedraw = FALSE;
501 assert(item->type == diParagraph);
502 editor->nHeight = max(editor->nHeight, item->member.para.nYPos);
503 if ((item->member.para.nFlags & MEPF_REWRAP)
504 || (item->member.para.nYPos != c.pt.y))
506 item->member.para.nYPos = c.pt.y;
508 ME_WrapTextParagraph(&c, item, editor->selofs);
512 item->member.para.nFlags |= MEPF_REPAINT;
517 bModified = bModified | bRedraw;
520 c.pt.y += item->member.para.nHeight;
521 item = item->member.para.next_para;
523 editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
524 editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
526 editor->nTotalLength = c.pt.y;
527 editor->pBuffer->pLast->member.para.nYPos = yLastPos;
529 ME_DestroyContext(&c, editor->hWnd);
531 /* Each paragraph may contain multiple rows, which should be scrollable, even
532 if the containing paragraph has nYPos == 0 */
533 item = editor->pBuffer->pFirst;
534 while ((item = ME_FindItemFwd(item, diStartRow)) != NULL) {
535 assert(item->type == diStartRow);
536 editor->nHeight = max(editor->nHeight, item->member.row.nYPos);
539 if (bModified || editor->nTotalLength < editor->nLastTotalLength)
540 ME_InvalidateMarkedParagraphs(editor);
544 void ME_InvalidateMarkedParagraphs(ME_TextEditor *editor) {
547 ME_InitContext(&c, editor, GetDC(editor->hWnd));
551 int ofs = ME_GetYScrollPos(editor);
553 ME_DisplayItem *item = editor->pBuffer->pFirst;
554 while(item != editor->pBuffer->pLast) {
555 if (item->member.para.nFlags & MEPF_REPAINT) {
556 rc.top = item->member.para.nYPos - ofs;
557 rc.bottom = item->member.para.nYPos + item->member.para.nHeight - ofs;
558 InvalidateRect(editor->hWnd, &rc, TRUE);
560 item = item->member.para.next_para;
562 if (editor->nTotalLength < editor->nLastTotalLength)
564 rc.top = editor->nTotalLength - ofs;
565 rc.bottom = editor->nLastTotalLength - ofs;
566 InvalidateRect(editor->hWnd, &rc, TRUE);
569 ME_DestroyContext(&c, editor->hWnd);
574 ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
576 if (editor->nEventMask & ENM_REQUESTRESIZE)
580 GetClientRect(editor->hWnd, &rc);
582 if (force || rc.bottom != editor->nTotalLength)
586 info.nmhdr.hwndFrom = editor->hWnd;
587 info.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
588 info.nmhdr.code = EN_REQUESTRESIZE;
590 info.rc.bottom = editor->nTotalLength;
592 editor->nEventMask &= ~ENM_REQUESTRESIZE;
593 SendMessageW(GetParent(editor->hWnd), WM_NOTIFY,
594 info.nmhdr.idFrom, (LPARAM)&info);
595 editor->nEventMask |= ENM_REQUESTRESIZE;