571 lines
17 KiB
C
571 lines
17 KiB
C
/*
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* RichEdit - Paragraph wrapping. Don't try to understand it. You've been
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* warned !
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*
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* Copyright 2004 by Krzysztof Foltman
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "editor.h"
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WINE_DEFAULT_DEBUG_CHANNEL(richedit);
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/*
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* Unsolved problems:
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*
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* - center and right align in WordPad omits all spaces at the start, we don't
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* - objects/images are not handled yet
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* - no tabs
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*/
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static ME_DisplayItem *ME_MakeRow(int height, int baseline, int width)
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{
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ME_DisplayItem *item = ME_MakeDI(diStartRow);
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item->member.row.nHeight = height;
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item->member.row.nBaseline = baseline;
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item->member.row.nWidth = width;
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return item;
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}
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static void ME_BeginRow(ME_WrapContext *wc)
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{
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wc->pRowStart = NULL;
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wc->bOverflown = FALSE;
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wc->pLastSplittableRun = NULL;
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if (wc->context->editor->bWordWrap)
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wc->nAvailWidth = wc->context->rcView.right - wc->context->rcView.left -
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(wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
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else
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wc->nAvailWidth = ~0u >> 1;
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wc->pt.x = 0;
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}
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static void ME_InsertRowStart(ME_WrapContext *wc, const ME_DisplayItem *pEnd)
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{
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ME_DisplayItem *p, *row, *para;
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int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
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/* wrap text */
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para = ME_GetParagraph(wc->pRowStart);
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for (p = wc->pRowStart; p!=pEnd; p = p->next)
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{
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/* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
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if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
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if (p->member.run.nAscent>ascent)
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ascent = p->member.run.nAscent;
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if (p->member.run.nDescent>descent)
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descent = p->member.run.nDescent;
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if (!(p->member.run.nFlags & (MERF_ENDPARA|MERF_SKIPPED)))
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width += p->member.run.nWidth;
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}
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}
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row = ME_MakeRow(ascent+descent, ascent, width);
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row->member.row.nYPos = wc->pt.y;
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row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
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row->member.row.nRMargin = wc->nRightMargin;
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assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
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align = para->member.para.pFmt->wAlignment;
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if (align == PFA_CENTER)
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shift = (wc->nAvailWidth-width)/2;
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if (align == PFA_RIGHT)
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shift = wc->nAvailWidth-width;
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for (p = wc->pRowStart; p!=pEnd; p = p->next)
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{
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if (p->type==diRun) { /* FIXME add more run types */
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p->member.run.pt.x += row->member.row.nLMargin+shift;
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}
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}
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ME_InsertBefore(wc->pRowStart, row);
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wc->nRow++;
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wc->pt.y += ascent+descent;
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ME_BeginRow(wc);
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}
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static void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
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{
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if (wc->pRowStart)
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ME_InsertRowStart(wc, p->next);
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/*
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p = p->member.para.prev_para->next;
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while(p) {
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if (p->type == diParagraph || p->type == diTextEnd)
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return;
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if (p->type == diRun)
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{
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ME_Run *run = &p->member.run;
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TRACE("%s - (%d, %d)\n", debugstr_w(run->strText->szData), run->pt.x, run->pt.y);
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}
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p = p->next;
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}
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*/
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}
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static void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
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{
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/* FIXME compose style (out of character and paragraph styles) here */
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ME_UpdateRunFlags(wc->context->editor, &p->member.run);
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ME_CalcRunExtent(wc->context, &ME_GetParagraph(p)->member.para,
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wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, &p->member.run);
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}
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static ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
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{
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ME_DisplayItem *pp, *piter = p;
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int j;
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if (!i)
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return NULL;
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j = ME_ReverseFindNonWhitespaceV(p->member.run.strText, i);
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if (j>0) {
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pp = ME_SplitRun(wc, piter, j);
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wc->pt.x += piter->member.run.nWidth;
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return pp;
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}
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else
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{
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pp = piter;
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/* omit all spaces before split point */
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while(piter != wc->pRowStart)
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{
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piter = ME_FindItemBack(piter, diRun);
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if (piter->member.run.nFlags & MERF_WHITESPACE)
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{
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pp = piter;
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continue;
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}
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if (piter->member.run.nFlags & MERF_ENDWHITE)
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{
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j = ME_ReverseFindNonWhitespaceV(piter->member.run.strText, i);
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pp = ME_SplitRun(wc, piter, i);
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wc->pt = pp->member.run.pt;
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return pp;
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}
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/* this run is the end of spaces, so the run edge is a good point to split */
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wc->pt = pp->member.run.pt;
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wc->bOverflown = TRUE;
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TRACE("Split point is: %s|%s\n", debugstr_w(piter->member.run.strText->szData), debugstr_w(pp->member.run.strText->szData));
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return pp;
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}
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wc->pt = piter->member.run.pt;
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return piter;
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}
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}
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static ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
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{
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ME_DisplayItem *piter = p, *pp;
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int i, idesp, len;
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ME_Run *run = &p->member.run;
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idesp = i = ME_CharFromPoint(wc->context, loc, run);
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len = ME_StrVLen(run->strText);
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assert(len>0);
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assert(i<len);
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if (i) {
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/* don't split words */
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i = ME_ReverseFindWhitespaceV(run->strText, i);
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pp = ME_MaximizeSplit(wc, p, i);
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if (pp)
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return pp;
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}
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TRACE("Must backtrack to split at: %s\n", debugstr_w(p->member.run.strText->szData));
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if (wc->pLastSplittableRun)
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{
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if (wc->pLastSplittableRun->member.run.nFlags & (MERF_GRAPHICS|MERF_TAB))
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{
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wc->pt = wc->ptLastSplittableRun;
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return wc->pLastSplittableRun;
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}
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else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
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{
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/* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
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they serve no other purpose */
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ME_UpdateRunFlags(wc->context->editor, run);
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assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
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piter = wc->pLastSplittableRun;
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run = &piter->member.run;
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len = ME_StrVLen(run->strText);
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/* don't split words */
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i = ME_ReverseFindWhitespaceV(run->strText, len);
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if (i == len)
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i = ME_ReverseFindNonWhitespaceV(run->strText, len);
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if (i) {
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ME_DisplayItem *piter2 = ME_SplitRun(wc, piter, i);
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wc->pt = piter2->member.run.pt;
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return piter2;
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}
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/* splittable = must have whitespaces */
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assert(0 == "Splittable, but no whitespaces");
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}
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else
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{
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/* restart from the first run beginning with spaces */
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wc->pt = wc->ptLastSplittableRun;
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return wc->pLastSplittableRun;
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}
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}
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TRACE("Backtracking failed, trying desperate: %s\n", debugstr_w(p->member.run.strText->szData));
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/* OK, no better idea, so assume we MAY split words if we can split at all*/
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if (idesp)
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return ME_SplitRun(wc, piter, idesp);
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else
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if (wc->pRowStart && piter != wc->pRowStart)
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{
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/* don't need to break current run, because it's possible to split
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before this run */
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wc->bOverflown = TRUE;
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return piter;
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}
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else
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{
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/* split point inside first character - no choice but split after that char */
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int chars = 1;
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int pos2 = ME_StrRelPos(run->strText, 0, &chars);
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if (pos2 != len) {
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/* the run is more than 1 char, so we may split */
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return ME_SplitRun(wc, piter, pos2);
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}
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/* the run is one char, can't split it */
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return piter;
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}
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}
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static ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
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{
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ME_DisplayItem *pp;
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ME_Run *run;
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int len;
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assert(p->type == diRun);
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if (!wc->pRowStart)
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wc->pRowStart = p;
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run = &p->member.run;
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run->pt.x = wc->pt.x;
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run->pt.y = wc->pt.y;
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ME_WrapSizeRun(wc, p);
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len = ME_StrVLen(run->strText);
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if (wc->bOverflown) /* just skipping final whitespaces */
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{
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if (run->nFlags & (MERF_WHITESPACE|MERF_TAB)) {
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p->member.run.nFlags |= MERF_SKIPPED;
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/* wc->pt.x += run->nWidth; */
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/* skip runs consisting of only whitespaces */
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return p->next;
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}
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if (run->nFlags & MERF_STARTWHITE) {
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/* try to split the run at the first non-white char */
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int black;
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black = ME_FindNonWhitespaceV(run->strText, 0);
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if (black) {
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wc->bOverflown = FALSE;
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pp = ME_SplitRun(wc, p, black);
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p->member.run.nFlags |= MERF_SKIPPED;
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ME_InsertRowStart(wc, pp);
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return pp;
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}
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}
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/* black run: the row goes from pRowStart to the previous run */
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ME_InsertRowStart(wc, p);
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return p;
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}
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/* simply end the current row and move on to next one */
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if (run->nFlags & MERF_ENDROW)
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{
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p = p->next;
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ME_InsertRowStart(wc, p);
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return p;
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}
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/* we're not at the end of the row */
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if (run->nFlags & MERF_TAB) {
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/* force recomputation of tabs' size as it depends on position */
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ME_CalcRunExtent(wc->context, &ME_GetParagraph(p)->member.para,
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wc->nRow ? wc->nLeftMargin : wc->nFirstMargin, run);
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}
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/* will current run fit? */
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if (wc->pt.x + run->nWidth > wc->nAvailWidth)
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{
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int loc = wc->nAvailWidth - wc->pt.x;
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/* total white run ? */
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if (run->nFlags & MERF_WHITESPACE) {
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/* let the overflow logic handle it */
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wc->bOverflown = TRUE;
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return p;
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}
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/* TAB: we can split before */
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if (run->nFlags & MERF_TAB) {
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wc->bOverflown = TRUE;
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return p;
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}
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/* graphics: we can split before, if run's width is smaller than row's width */
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if ((run->nFlags & MERF_GRAPHICS) && run->nWidth <= wc->nAvailWidth) {
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wc->bOverflown = TRUE;
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return p;
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}
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/* can we separate out the last spaces ? (to use overflow logic later) */
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if (run->nFlags & MERF_ENDWHITE)
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{
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/* we aren't sure if it's *really* necessary, it's a good start however */
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int black = ME_ReverseFindNonWhitespaceV(run->strText, len);
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ME_SplitRun(wc, p, black);
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/* handle both parts again */
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return p;
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}
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/* determine the split point by backtracking */
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pp = ME_SplitByBacktracking(wc, p, loc);
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if (pp == wc->pRowStart)
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{
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/* we had only spaces so far, entire content can be omitted */
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wc->pt.x = 0;
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return p->next;
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}
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if (p != pp) /* found a suitable split point */
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{
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wc->bOverflown = TRUE;
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return pp;
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}
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/* we detected that it's best to split on start of this run */
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if (wc->bOverflown)
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return pp;
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ERR("failure!\n");
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/* not found anything - writing over margins is the only option left */
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}
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if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
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|| ((run->nFlags & (MERF_GRAPHICS|MERF_TAB)) && (p != wc->pRowStart)))
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{
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wc->pLastSplittableRun = p;
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wc->ptLastSplittableRun = wc->pt;
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}
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wc->pt.x += run->nWidth;
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return p->next;
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}
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static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp);
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static void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp, DWORD beginofs) {
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ME_DisplayItem *p;
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ME_WrapContext wc;
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int border = 0;
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int linespace = 0;
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assert(tp->type == diParagraph);
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if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
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return;
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}
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ME_PrepareParagraphForWrapping(c, tp);
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wc.context = c;
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/* wc.para_style = tp->member.para.style; */
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wc.style = NULL;
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wc.nFirstMargin = ME_twips2pointsX(c, tp->member.para.pFmt->dxStartIndent) + beginofs;
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wc.nLeftMargin = wc.nFirstMargin + ME_twips2pointsX(c, tp->member.para.pFmt->dxOffset);
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wc.nRightMargin = ME_twips2pointsX(c, tp->member.para.pFmt->dxRightIndent);
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wc.nRow = 0;
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wc.pt.x = 0;
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wc.pt.y = 0;
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if (tp->member.para.pFmt->dwMask & PFM_SPACEBEFORE)
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wc.pt.y += ME_twips2pointsY(c, tp->member.para.pFmt->dySpaceBefore);
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if (tp->member.para.pFmt->dwMask & PFM_BORDER)
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{
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border = ME_GetParaBorderWidth(c->editor, tp->member.para.pFmt->wBorders);
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if (tp->member.para.pFmt->wBorders & 1) {
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wc.nFirstMargin += border;
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wc.nLeftMargin += border;
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}
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if (tp->member.para.pFmt->wBorders & 2)
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wc.nRightMargin -= border;
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if (tp->member.para.pFmt->wBorders & 4)
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wc.pt.y += border;
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}
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if (c->editor->bWordWrap)
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wc.nAvailWidth = c->rcView.right - c->rcView.left - wc.nFirstMargin - wc.nRightMargin;
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else
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wc.nAvailWidth = ~0u >> 1;
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wc.pRowStart = NULL;
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linespace = ME_GetParaLineSpace(c, &tp->member.para);
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ME_BeginRow(&wc);
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for (p = tp->next; p!=tp->member.para.next_para; ) {
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assert(p->type != diStartRow);
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if (p->type == diRun) {
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p = ME_WrapHandleRun(&wc, p);
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}
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else p = p->next;
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if (wc.nRow && p == wc.pRowStart)
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wc.pt.y += linespace;
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}
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ME_WrapEndParagraph(&wc, p);
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if ((tp->member.para.pFmt->dwMask & PFM_BORDER) && (tp->member.para.pFmt->wBorders & 8))
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wc.pt.y += border;
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if (tp->member.para.pFmt->dwMask & PFM_SPACEAFTER)
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wc.pt.y += ME_twips2pointsY(c, tp->member.para.pFmt->dySpaceAfter);
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tp->member.para.nFlags &= ~MEPF_REWRAP;
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tp->member.para.nHeight = wc.pt.y;
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tp->member.para.nRows = wc.nRow;
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}
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static void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
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ME_DisplayItem *p, *pRow;
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/* remove all items that will be reinserted by paragraph wrapper anyway */
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tp->member.para.nRows = 0;
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for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
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switch(p->type) {
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case diStartRow:
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pRow = p;
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p = p->prev;
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ME_Remove(pRow);
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ME_DestroyDisplayItem(pRow);
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break;
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default:
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break;
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}
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}
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/* join runs that can be joined, set up flags */
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for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
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int changed = 0;
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switch(p->type) {
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case diStartRow: assert(0); break; /* should have deleted it */
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case diRun:
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while (p->next->type == diRun) { /* FIXME */
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if (ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
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ME_JoinRuns(c->editor, p);
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changed = 1;
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}
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else
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break;
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}
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p->member.run.nFlags &= ~MERF_CALCBYWRAP;
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break;
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default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor) {
|
|
ME_DisplayItem *item;
|
|
ME_Context c;
|
|
BOOL bModified = FALSE;
|
|
int yStart = -1;
|
|
|
|
ME_InitContext(&c, editor, GetDC(editor->hWnd));
|
|
c.pt.x = 0;
|
|
c.pt.y = 0;
|
|
editor->nHeight = 0;
|
|
item = editor->pBuffer->pFirst->next;
|
|
while(item != editor->pBuffer->pLast) {
|
|
BOOL bRedraw = FALSE;
|
|
|
|
assert(item->type == diParagraph);
|
|
editor->nHeight = max(editor->nHeight, item->member.para.nYPos);
|
|
if ((item->member.para.nFlags & MEPF_REWRAP)
|
|
|| (item->member.para.nYPos != c.pt.y))
|
|
bRedraw = TRUE;
|
|
item->member.para.nYPos = c.pt.y;
|
|
|
|
ME_WrapTextParagraph(&c, item, editor->selofs);
|
|
|
|
if (bRedraw)
|
|
{
|
|
item->member.para.nFlags |= MEPF_REPAINT;
|
|
if (yStart == -1)
|
|
yStart = c.pt.y;
|
|
}
|
|
|
|
bModified = bModified | bRedraw;
|
|
|
|
c.pt.y += item->member.para.nHeight;
|
|
item = item->member.para.next_para;
|
|
}
|
|
editor->sizeWindow.cx = c.rcView.right-c.rcView.left;
|
|
editor->sizeWindow.cy = c.rcView.bottom-c.rcView.top;
|
|
|
|
editor->nTotalLength = c.pt.y;
|
|
|
|
ME_DestroyContext(&c, editor->hWnd);
|
|
|
|
if (bModified || editor->nTotalLength < editor->nLastTotalLength)
|
|
ME_InvalidateMarkedParagraphs(editor);
|
|
return bModified;
|
|
}
|
|
|
|
void ME_InvalidateMarkedParagraphs(ME_TextEditor *editor) {
|
|
ME_Context c;
|
|
|
|
ME_InitContext(&c, editor, GetDC(editor->hWnd));
|
|
if (editor->bRedraw)
|
|
{
|
|
RECT rc = c.rcView;
|
|
int ofs = ME_GetYScrollPos(editor);
|
|
|
|
ME_DisplayItem *item = editor->pBuffer->pFirst;
|
|
while(item != editor->pBuffer->pLast) {
|
|
if (item->member.para.nFlags & MEPF_REPAINT) {
|
|
rc.top = item->member.para.nYPos - ofs;
|
|
rc.bottom = item->member.para.nYPos + item->member.para.nHeight - ofs;
|
|
InvalidateRect(editor->hWnd, &rc, TRUE);
|
|
}
|
|
item = item->member.para.next_para;
|
|
}
|
|
if (editor->nTotalLength < editor->nLastTotalLength)
|
|
{
|
|
rc.top = editor->nTotalLength - ofs;
|
|
rc.bottom = editor->nLastTotalLength - ofs;
|
|
InvalidateRect(editor->hWnd, &rc, TRUE);
|
|
}
|
|
}
|
|
ME_DestroyContext(&c, editor->hWnd);
|
|
}
|
|
|
|
|
|
void
|
|
ME_SendRequestResize(ME_TextEditor *editor, BOOL force)
|
|
{
|
|
if (editor->nEventMask & ENM_REQUESTRESIZE)
|
|
{
|
|
RECT rc;
|
|
|
|
GetClientRect(editor->hWnd, &rc);
|
|
|
|
if (force || rc.bottom != editor->nTotalLength)
|
|
{
|
|
REQRESIZE info;
|
|
|
|
info.nmhdr.hwndFrom = editor->hWnd;
|
|
info.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
|
|
info.nmhdr.code = EN_REQUESTRESIZE;
|
|
info.rc = rc;
|
|
info.rc.bottom = editor->nTotalLength;
|
|
|
|
editor->nEventMask &= ~ENM_REQUESTRESIZE;
|
|
SendMessageW(GetParent(editor->hWnd), WM_NOTIFY,
|
|
info.nmhdr.idFrom, (LPARAM)&info);
|
|
editor->nEventMask |= ENM_REQUESTRESIZE;
|
|
}
|
|
}
|
|
}
|