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 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 wc->nAvailWidth = wc->nTotalWidth - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
54 void ME_InsertRowStart(ME_WrapContext *wc, const ME_DisplayItem *pEnd)
56 ME_DisplayItem *p, *row, *para;
57 int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
59 para = ME_GetParagraph(wc->pRowStart);
60 for (p = wc->pRowStart; p!=pEnd; p = p->next)
62 /* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
63 if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
64 if (p->member.run.nAscent>ascent)
65 ascent = p->member.run.nAscent;
66 if (p->member.run.nDescent>descent)
67 descent = p->member.run.nDescent;
68 if (!(p->member.run.nFlags & (MERF_ENDPARA|MERF_SKIPPED)))
69 width += p->member.run.nWidth;
72 row = ME_MakeRow(ascent+descent, ascent, width);
73 row->member.row.nYPos = wc->pt.y;
74 row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
75 row->member.row.nRMargin = wc->nRightMargin;
76 assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
77 align = para->member.para.pFmt->wAlignment;
78 if (align == PFA_CENTER)
79 shift = (wc->nAvailWidth-width)/2;
80 if (align == PFA_RIGHT)
81 shift = wc->nAvailWidth-width;
82 for (p = wc->pRowStart; p!=pEnd; p = p->next)
84 if (p->type==diRun) { /* FIXME add more run types */
85 p->member.run.pt.x += row->member.row.nLMargin+shift;
88 ME_InsertBefore(wc->pRowStart, row);
90 wc->pt.y += ascent+descent;
94 static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
97 ME_InsertRowStart(wc, p->next);
100 p = p->member.para.prev_para->next;
102 if (p->type == diParagraph || p->type == diTextEnd)
104 if (p->type == diRun)
106 ME_Run *run = &p->member.run;
107 TRACE("%s - (%d, %d)\n", debugstr_w(run->strText->szData), run->pt.x, run->pt.y);
114 static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
116 /* FIXME compose style (out of character and paragraph styles) here */
118 ME_UpdateRunFlags(wc->context->editor, &p->member.run);
120 ME_CalcRunExtent(wc->context, &ME_GetParagraph(p)->member.para, &p->member.run);
123 static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
125 ME_DisplayItem *pp, *piter = p;
129 j = ME_ReverseFindNonWhitespaceV(p->member.run.strText, i);
131 pp = ME_SplitRun(wc->context, piter, j);
132 wc->pt.x += piter->member.run.nWidth;
138 /* omit all spaces before split point */
139 while(piter != wc->pRowStart)
141 piter = ME_FindItemBack(piter, diRun);
142 if (piter->member.run.nFlags & MERF_WHITESPACE)
147 if (piter->member.run.nFlags & MERF_ENDWHITE)
149 j = ME_ReverseFindNonWhitespaceV(piter->member.run.strText, i);
150 pp = ME_SplitRun(wc->context, piter, i);
151 wc->pt = pp->member.run.pt;
154 /* this run is the end of spaces, so the run edge is a good point to split */
155 wc->pt = pp->member.run.pt;
156 wc->bOverflown = TRUE;
157 TRACE("Split point is: %s|%s\n", debugstr_w(piter->member.run.strText->szData), debugstr_w(pp->member.run.strText->szData));
160 wc->pt = piter->member.run.pt;
165 static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
167 ME_DisplayItem *piter = p, *pp;
169 ME_Run *run = &p->member.run;
171 idesp = i = ME_CharFromPoint(wc->context->editor, loc, run);
172 len = ME_StrVLen(run->strText);
176 /* don't split words */
177 i = ME_ReverseFindWhitespaceV(run->strText, i);
178 pp = ME_MaximizeSplit(wc, p, i);
182 TRACE("Must backtrack to split at: %s\n", debugstr_w(p->member.run.strText->szData));
183 if (wc->pLastSplittableRun)
185 if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
187 wc->pt = wc->ptLastSplittableRun;
188 return wc->pLastSplittableRun;
190 else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
192 /* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
193 they serve no other purpose */
194 ME_UpdateRunFlags(wc->context->editor, run);
195 assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
197 piter = wc->pLastSplittableRun;
198 run = &piter->member.run;
199 len = ME_StrVLen(run->strText);
200 /* don't split words */
201 i = ME_ReverseFindWhitespaceV(run->strText, len);
203 i = ME_ReverseFindNonWhitespaceV(run->strText, len);
205 ME_DisplayItem *piter2 = ME_SplitRun(wc->context, piter, i);
206 wc->pt = piter2->member.run.pt;
209 /* splittable = must have whitespaces */
210 assert(0 == "Splittable, but no whitespaces");
214 /* restart from the first run beginning with spaces */
215 wc->pt = wc->ptLastSplittableRun;
216 return wc->pLastSplittableRun;
219 TRACE("Backtracking failed, trying desperate: %s\n", debugstr_w(p->member.run.strText->szData));
220 /* OK, no better idea, so assume we MAY split words if we can split at all*/
222 return ME_SplitRun(wc->context, piter, idesp);
224 if (wc->pRowStart && piter != wc->pRowStart)
226 /* don't need to break current run, because it's possible to split
228 wc->bOverflown = TRUE;
233 /* split point inside first character - no choice but split after that char */
235 int pos2 = ME_StrRelPos(run->strText, 0, &chars);
237 /* the run is more than 1 char, so we may split */
238 return ME_SplitRun(wc->context, piter, pos2);
240 /* the run is one char, can't split it */
245 static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
251 assert(p->type == diRun);
254 run = &p->member.run;
255 run->pt.x = wc->pt.x;
256 run->pt.y = wc->pt.y;
257 ME_WrapSizeRun(wc, p);
258 len = ME_StrVLen(run->strText);
260 if (wc->bOverflown) /* just skipping final whitespaces */
262 if (run->nFlags & (MERF_WHITESPACE|MERF_TAB)) {
263 p->member.run.nFlags |= MERF_SKIPPED;
264 /* wc->pt.x += run->nWidth; */
265 /* skip runs consisting of only whitespaces */
269 if (run->nFlags & MERF_STARTWHITE) {
270 /* try to split the run at the first non-white char */
272 black = ME_FindNonWhitespaceV(run->strText, 0);
274 wc->bOverflown = FALSE;
275 pp = ME_SplitRun(wc->context, p, black);
276 p->member.run.nFlags |= MERF_SKIPPED;
277 ME_InsertRowStart(wc, pp);
281 /* black run: the row goes from pRowStart to the previous run */
282 ME_InsertRowStart(wc, p);
285 /* we're not at the end of the row */
286 /* will current run fit? */
287 if (wc->pt.x + run->nWidth > wc->nAvailWidth)
289 int loc = wc->nAvailWidth - wc->pt.x;
290 /* total white run ? */
291 if (run->nFlags & MERF_WHITESPACE) {
292 /* let the overflow logic handle it */
293 wc->bOverflown = TRUE;
296 /* graphics or TAB - we can split before */
297 if (run->nFlags & (MERF_GRAPHICS|MERF_TAB)) {
298 wc->bOverflown = TRUE;
301 /* can we separate out the last spaces ? (to use overflow logic later) */
302 if (run->nFlags & MERF_ENDWHITE)
304 /* we aren't sure if it's *really* necessary, it's a good start however */
305 int black = ME_ReverseFindNonWhitespaceV(run->strText, len);
306 ME_SplitRun(wc->context, p, black);
307 /* handle both parts again */
310 /* determine the split point by backtracking */
311 pp = ME_SplitByBacktracking(wc, p, loc);
312 if (pp == wc->pRowStart)
314 /* we had only spaces so far, entire content can be omitted */
318 if (p != pp) /* found a suitable split point */
320 wc->bOverflown = TRUE;
323 /* we detected that it's best to split on start of this run */
327 /* not found anything - writing over margins is the only option left */
329 if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
330 || ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
332 wc->pLastSplittableRun = p;
333 wc->ptLastSplittableRun = wc->pt;
335 wc->pt.x += run->nWidth;
339 void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp) {
342 int dpi = GetDeviceCaps(c->hDC, LOGPIXELSX);
344 assert(tp->type == diParagraph);
345 if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
348 ME_PrepareParagraphForWrapping(c, tp);
351 /* wc.para_style = tp->member.para.style; */
353 tp->member.para.nRightMargin = tp->member.para.pFmt->dxRightIndent*dpi/1440;
354 tp->member.para.nFirstMargin = tp->member.para.pFmt->dxStartIndent*dpi/1440;
355 tp->member.para.nLeftMargin = (tp->member.para.pFmt->dxStartIndent+tp->member.para.pFmt->dxOffset)*dpi/1440;
356 wc.nFirstMargin = tp->member.para.nFirstMargin;
357 wc.nLeftMargin = tp->member.para.nLeftMargin;
358 wc.nRightMargin = tp->member.para.nRightMargin;
362 wc.nTotalWidth = c->rcView.right - c->rcView.left;
363 wc.nAvailWidth = wc.nTotalWidth - wc.nFirstMargin - wc.nRightMargin;
367 for (p = tp->next; p!=tp->member.para.next_para; ) {
368 assert(p->type != diStartRow);
369 if (p->type == diRun) {
370 p = ME_WrapHandleRun(&wc, p);
375 ME_WrapEndParagraph(&wc, p);
376 tp->member.para.nFlags &= ~MEPF_REWRAP;
377 tp->member.para.nHeight = wc.pt.y;
378 tp->member.para.nRows = wc.nRow;
382 void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
383 ME_DisplayItem *p, *pRow;
385 /* remove all items that will be reinserted by paragraph wrapper anyway */
386 tp->member.para.nRows = 0;
387 for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
393 ME_DestroyDisplayItem(pRow);
399 /* join runs that can be joined, set up flags */
400 for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
403 case diStartRow: assert(0); break; /* should have deleted it */
405 while (p->next->type == diRun) { /* FIXME */
406 if (ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
407 ME_JoinRuns(c->editor, p);
413 p->member.run.nFlags &= ~MERF_CALCBYWRAP;
421 BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor) {
422 HWND hWnd = editor->hWnd;
423 HDC hDC = GetDC(hWnd);
424 ME_DisplayItem *item;
426 BOOL bModified = FALSE;
427 int yStart = -1, yEnd = -1;
429 ME_InitContext(&c, editor, hDC);
433 item = editor->pBuffer->pFirst->next;
434 while(item != editor->pBuffer->pLast) {
435 BOOL bRedraw = FALSE;
437 assert(item->type == diParagraph);
438 editor->nHeight = max(editor->nHeight, item->member.para.nYPos);
439 if ((item->member.para.nFlags & MEPF_REWRAP)
440 || (item->member.para.nYPos != c.pt.y))
442 item->member.para.nYPos = c.pt.y;
444 ME_WrapTextParagraph(&c, item);
448 item->member.para.nFlags |= MEPF_REPAINT;
453 bModified = bModified | bRedraw;
455 c.pt.y += item->member.para.nHeight;
458 item = item->member.para.next_para;
460 editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
461 editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
463 editor->nTotalLength = c.pt.y;
465 ME_DestroyContext(&c);
466 ReleaseDC(hWnd, hDC);
468 if (bModified || editor->nTotalLength < editor->nLastTotalLength)
469 ME_InvalidateMarkedParagraphs(editor);
473 void ME_InvalidateMarkedParagraphs(ME_TextEditor *editor) {
475 HDC hDC = GetDC(editor->hWnd);
477 ME_InitContext(&c, editor, hDC);
481 int ofs = ME_GetYScrollPos(editor);
483 ME_DisplayItem *item = editor->pBuffer->pFirst;
484 while(item != editor->pBuffer->pLast) {
485 if (item->member.para.nFlags & MEPF_REPAINT) {
486 rc.top = item->member.para.nYPos - ofs;
487 rc.bottom = item->member.para.nYPos + item->member.para.nHeight - ofs;
488 InvalidateRect(editor->hWnd, &rc, TRUE);
490 item = item->member.para.next_para;
492 if (editor->nTotalLength < editor->nLastTotalLength)
494 rc.top = editor->nTotalLength - ofs;
495 rc.bottom = editor->nLastTotalLength - ofs;
496 InvalidateRect(editor->hWnd, &rc, TRUE);
499 ME_DestroyContext(&c);
500 ReleaseDC(editor->hWnd, hDC);
505 ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
507 if (editor->nEventMask & ENM_REQUESTRESIZE)
511 GetClientRect(editor->hWnd, &rc);
513 if (force || rc.bottom != editor->nTotalLength)
517 info.nmhdr.hwndFrom = editor->hWnd;
518 info.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
519 info.nmhdr.code = EN_REQUESTRESIZE;
521 info.rc.bottom = editor->nTotalLength;
523 SendMessageW(GetParent(editor->hWnd), WM_NOTIFY,
524 info.nmhdr.idFrom, (LPARAM)&info);