Sweden-Number/dlls/riched20/wrap.c

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2005-03-05 12:19:14 +01:00
/*
* RichEdit - Paragraph wrapping. Don't try to understand it. You've been
* warned !
*
* Copyright 2004 by Krzysztof Foltman
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "editor.h"
WINE_DEFAULT_DEBUG_CHANNEL(richedit);
/*
* Unsolved problems:
*
* - center and right align in WordPad omits all spaces at the start, we don't
* - objects/images are not handled yet
* - no tabs
*/
ME_DisplayItem *ME_MakeRow(int height, int baseline, int width)
{
ME_DisplayItem *item = ME_MakeDI(diStartRow);
item->member.row.nHeight = height;
item->member.row.nBaseline = baseline;
item->member.row.nWidth = width;
return item;
}
void ME_BeginRow(ME_WrapContext *wc)
{
wc->pRowStart = NULL;
wc->bOverflown = FALSE;
wc->pLastSplittableRun = NULL;
wc->nAvailWidth = wc->nTotalWidth - (wc->nRow ? wc->nLeftMargin : wc->nFirstMargin) - wc->nRightMargin;
wc->pt.x = 0;
}
void ME_InsertRowStart(ME_WrapContext *wc, ME_DisplayItem *pEnd)
{
ME_DisplayItem *p, *row, *para;
int ascent = 0, descent = 0, width=0, shift = 0, align = 0;
/* wrap text */
para = ME_GetParagraph(wc->pRowStart);
for (p = wc->pRowStart; p!=pEnd; p = p->next)
{
/* ENDPARA run shouldn't affect row height, except if it's the only run in the paragraph */
if (p->type==diRun && ((p==wc->pRowStart) || !(p->member.run.nFlags & MERF_ENDPARA))) { /* FIXME add more run types */
if (p->member.run.nAscent>ascent)
ascent = p->member.run.nAscent;
if (p->member.run.nDescent>descent)
descent = p->member.run.nDescent;
if (!(p->member.run.nFlags & (MERF_ENDPARA|MERF_SKIPPED)))
width += p->member.run.nWidth;
}
}
row = ME_MakeRow(ascent+descent, ascent, width);
row->member.row.nYPos = wc->pt.y;
row->member.row.nLMargin = (!wc->nRow ? wc->nFirstMargin : wc->nLeftMargin);
row->member.row.nRMargin = wc->nRightMargin;
assert(para->member.para.pFmt->dwMask & PFM_ALIGNMENT);
align = para->member.para.pFmt->wAlignment;
if (align == PFA_CENTER)
shift = (wc->nAvailWidth-width)/2;
if (align == PFA_RIGHT)
shift = wc->nAvailWidth-width;
for (p = wc->pRowStart; p!=pEnd; p = p->next)
{
if (p->type==diRun) { /* FIXME add more run types */
p->member.run.pt.x += row->member.row.nLMargin+shift;
}
}
ME_InsertBefore(wc->pRowStart, row);
wc->nRow++;
wc->pt.y += ascent+descent;
ME_BeginRow(wc);
}
void ME_WrapEndParagraph(ME_WrapContext *wc, ME_DisplayItem *p)
{
if (wc->pRowStart)
ME_InsertRowStart(wc, p->next);
/*
p = p->member.para.prev_para->next;
while(p) {
if (p->type == diParagraph || p->type == diTextEnd)
return;
if (p->type == diRun)
{
ME_Run *run = &p->member.run;
TRACE("%s - (%d, %d)\n", debugstr_w(run->strText->szData), run->pt.x, run->pt.y);
}
p = p->next;
}
*/
}
void ME_WrapSizeRun(ME_WrapContext *wc, ME_DisplayItem *p)
{
/* FIXME compose style (out of character and paragraph styles) here */
ME_UpdateRunFlags(wc->context->editor, &p->member.run);
ME_CalcRunExtent(wc->context, &p->member.run);
}
ME_DisplayItem *ME_MaximizeSplit(ME_WrapContext *wc, ME_DisplayItem *p, int i)
{
ME_DisplayItem *pp, *piter = p;
int j;
if (!i)
return NULL;
j = ME_ReverseFindNonWhitespaceV(p->member.run.strText, i);
if (j>0) {
pp = ME_SplitRun(wc->context, piter, j);
wc->pt.x += piter->member.run.nWidth;
return pp;
}
else
{
pp = piter;
/* omit all spaces before split point */
while(piter != wc->pRowStart)
{
piter = ME_FindItemBack(piter, diRun);
if (piter->member.run.nFlags & MERF_WHITESPACE)
{
pp = piter;
continue;
}
if (piter->member.run.nFlags & MERF_ENDWHITE)
{
j = ME_ReverseFindNonWhitespaceV(piter->member.run.strText, i);
pp = ME_SplitRun(wc->context, piter, i);
wc->pt = pp->member.run.pt;
return pp;
}
/* this run is the end of spaces, so the run edge is a good point to split */
wc->pt = pp->member.run.pt;
wc->bOverflown = TRUE;
TRACE("Split point is: %s|%s\n", debugstr_w(piter->member.run.strText->szData), debugstr_w(pp->member.run.strText->szData));
return pp;
}
wc->pt = piter->member.run.pt;
return piter;
}
}
ME_DisplayItem *ME_SplitByBacktracking(ME_WrapContext *wc, ME_DisplayItem *p, int loc)
{
ME_DisplayItem *piter = p, *pp;
int i, idesp, len;
ME_Run *run = &p->member.run;
idesp = i = ME_CharFromPoint(wc->context->editor, loc, run);
len = ME_StrVLen(run->strText);
assert(len>0);
assert(i<len);
if (i) {
/* don't split words */
i = ME_ReverseFindWhitespaceV(run->strText, i);
pp = ME_MaximizeSplit(wc, p, i);
if (pp)
return pp;
}
TRACE("Must backtrack to split at: %s\n", debugstr_w(p->member.run.strText->szData));
if (wc->pLastSplittableRun)
{
if (wc->pLastSplittableRun->member.run.nFlags & MERF_GRAPHICS)
{
wc->pt = wc->ptLastSplittableRun;
return wc->pLastSplittableRun;
}
else if (wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE)
{
/* the following two lines are just to check if we forgot to call UpdateRunFlags earlier,
they serve no other purpose */
ME_UpdateRunFlags(wc->context->editor, run);
assert((wc->pLastSplittableRun->member.run.nFlags & MERF_SPLITTABLE));
piter = wc->pLastSplittableRun;
run = &piter->member.run;
len = ME_StrVLen(run->strText);
/* don't split words */
i = ME_ReverseFindWhitespaceV(run->strText, len);
if (i == len)
i = ME_ReverseFindNonWhitespaceV(run->strText, len);
if (i) {
ME_DisplayItem *piter2 = ME_SplitRun(wc->context, piter, i);
wc->pt = piter2->member.run.pt;
return piter2;
}
/* splittable = must have whitespaces */
assert(0 == "Splittable, but no whitespaces");
}
else
{
/* restart from the first run beginning with spaces */
wc->pt = wc->ptLastSplittableRun;
return wc->pLastSplittableRun;
}
}
TRACE("Backtracking failed, trying desperate: %s\n", debugstr_w(p->member.run.strText->szData));
/* OK, no better idea, so assume we MAY split words if we can split at all*/
if (idesp)
return ME_SplitRun(wc->context, piter, idesp);
else
if (wc->pRowStart && piter != wc->pRowStart)
{
/* don't need to break current run, because it's possible to split
before this run */
wc->bOverflown = TRUE;
return piter;
}
else
{
/* split point inside first character - no choice but split after that char */
int chars = 1;
int pos2 = ME_StrRelPos(run->strText, 0, &chars);
if (pos2 != len) {
/* the run is more than 1 char, so we may split */
return ME_SplitRun(wc->context, piter, pos2);
}
/* the run is one char, can't split it */
return piter;
}
}
ME_DisplayItem *ME_WrapHandleRun(ME_WrapContext *wc, ME_DisplayItem *p)
{
ME_DisplayItem *pp;
ME_Run *run;
int len;
assert(p->type == diRun);
if (!wc->pRowStart)
wc->pRowStart = p;
ME_WrapSizeRun(wc, p);
run = &p->member.run;
run->pt.x = wc->pt.x;
run->pt.y = wc->pt.y;
len = ME_StrVLen(run->strText);
if (wc->bOverflown) /* just skipping final whitespaces */
{
if (run->nFlags & MERF_WHITESPACE) {
p->member.run.nFlags |= MERF_SKIPPED;
/* wc->pt.x += run->nWidth; */
/* skip runs consisting of only whitespaces */
return p->next;
}
if (run->nFlags & MERF_STARTWHITE) {
/* try to split the run at the first non-white char */
int black;
black = ME_FindNonWhitespaceV(run->strText, 0);
if (black) {
wc->bOverflown = FALSE;
pp = ME_SplitRun(wc->context, p, black);
p->member.run.nFlags |= MERF_SKIPPED;
ME_InsertRowStart(wc, pp);
return pp;
}
}
/* black run: the row goes from pRowStart to the previous run */
ME_InsertRowStart(wc, p);
return p;
}
/* we're not at the end of the row */
/* will current run fit? */
if (wc->pt.x + run->nWidth > wc->nAvailWidth)
{
int loc = wc->nAvailWidth - wc->pt.x;
/* total white run ? */
if (run->nFlags & MERF_WHITESPACE) {
/* let the overflow logic handle it */
wc->bOverflown = TRUE;
return p;
}
/* graphics - we can split before */
if (run->nFlags & MERF_GRAPHICS) {
wc->bOverflown = TRUE;
return p;
}
/* can we separate out the last spaces ? (to use overflow logic later) */
if (run->nFlags & MERF_ENDWHITE)
{
/* we aren't sure if it's *really* necessary, it's a good start however */
int black = ME_ReverseFindNonWhitespaceV(run->strText, len);
ME_SplitRun(wc->context, p, black);
/* handle both parts again */
return p;
}
/* determine the split point by backtracking */
pp = ME_SplitByBacktracking(wc, p, loc);
if (pp == wc->pRowStart)
{
/* we had only spaces so far, entire content can be omitted */
wc->pt.x = 0;
return p->next;
}
if (p != pp) /* found a suitable split point */
{
wc->bOverflown = TRUE;
return pp;
}
/* we detected that it's best to split on start of this run */
if (wc->bOverflown)
return pp;
ERR("failure!\n");
/* not found anything - writing over margins is the only option left */
}
if ((run->nFlags & (MERF_SPLITTABLE | MERF_STARTWHITE))
|| ((run->nFlags & MERF_GRAPHICS) && (p != wc->pRowStart)))
{
wc->pLastSplittableRun = p;
wc->ptLastSplittableRun = wc->pt;
}
wc->pt.x += run->nWidth;
return p->next;
}
void ME_WrapTextParagraph(ME_Context *c, ME_DisplayItem *tp) {
ME_DisplayItem *p;
ME_WrapContext wc;
assert(tp->type == diParagraph);
if (!(tp->member.para.nFlags & MEPF_REWRAP)) {
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return;
}
ME_PrepareParagraphForWrapping(c, tp);
wc.context = c;
/* wc.para_style = tp->member.para.style; */
wc.style = NULL;
wc.nFirstMargin = tp->member.para.nFirstMargin;
wc.nLeftMargin = tp->member.para.nLeftMargin;
wc.nRightMargin = tp->member.para.nRightMargin;
wc.nRow = 0;
wc.pt.x = 0;
wc.pt.y = 0;
wc.nTotalWidth = c->rcView.right - c->rcView.left;
wc.nAvailWidth = wc.nTotalWidth - wc.nFirstMargin - wc.nRightMargin;
wc.pRowStart = NULL;
ME_BeginRow(&wc);
for (p = tp->next; p!=tp->member.para.next_para; ) {
assert(p->type != diStartRow);
if (p->type == diRun) {
p = ME_WrapHandleRun(&wc, p);
continue;
}
p = p->next;
}
ME_WrapEndParagraph(&wc, p);
tp->member.para.nFlags &= ~MEPF_REWRAP;
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tp->member.para.nHeight = wc.pt.y;
}
void ME_PrepareParagraphForWrapping(ME_Context *c, ME_DisplayItem *tp) {
ME_DisplayItem *p;
/* remove all items that will be reinserted by paragraph wrapper anyway */
for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
switch(p->type) {
case diStartRow:
p = p->prev;
ME_Remove(p->next);
break;
default:
break;
}
}
/* join runs that can be joined, set up flags */
for (p = tp->next; p!=tp->member.para.next_para; p = p->next) {
int changed = 0;
switch(p->type) {
case diStartRow: assert(0); break; /* should have deleted it */
case diRun:
while (p->next->type == diRun) { /* FIXME */
if (ME_CanJoinRuns(&p->member.run, &p->next->member.run)) {
ME_JoinRuns(c->editor, p);
changed = 1;
}
else
break;
}
p->member.run.nFlags &= ~MERF_CALCBYWRAP;
break;
default:
break;
}
}
}
BOOL ME_WrapMarkedParagraphs(ME_TextEditor *editor) {
HWND hWnd = editor->hWnd;
HDC hDC = GetDC(hWnd);
ME_DisplayItem *item;
ME_Context c;
BOOL bModified = FALSE;
ME_InitContext(&c, editor, hDC);
c.pt.x = 0;
c.pt.y = 0;
item = editor->pBuffer->pFirst->next;
while(item != editor->pBuffer->pLast) {
BOOL bRedraw = FALSE;
assert(item->type == diParagraph);
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);
if (bRedraw)
item->member.para.nFlags |= MEPF_REPAINT;
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);
ReleaseDC(hWnd, hDC);
return bModified;
}