run.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/*
 * RichEdit - operations on runs (diRun, rectangular pieces of paragraphs).
 * Splitting/joining runs. Adjusting offsets after deleting/adding content.
 * Character/pixel conversions.
 *
 * 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);
WINE_DECLARE_DEBUG_CHANNEL(richedit_check);
WINE_DECLARE_DEBUG_CHANNEL(richedit_lists);

int ME_CanJoinRuns(ME_Run *run1, ME_Run *run2)
{
  if ((run1->nFlags | run2->nFlags) & MERF_NOJOIN)
    return 0;
  if (run1->style != run2->style)
    return 0;
  if ((run1->nFlags & MERF_STYLEFLAGS) != (run2->nFlags & MERF_STYLEFLAGS))
    return 0;
  return 1;
}

void ME_SkipAndPropagateCharOffset(ME_DisplayItem *p, int shift)
{
  p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
  assert(p);
  ME_PropagateCharOffset(p, shift);
}

void ME_PropagateCharOffset(ME_DisplayItem *p, int shift)
{
  if (p->type == diRun) /* propagate in all runs in this para */
  {
    TRACE("PropagateCharOffset(%s, %d)\n", debugstr_w(p->member.run.strText->szData), shift);
    do {
      p->member.run.nCharOfs += shift;
      assert(p->member.run.nCharOfs >= 0);
      p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
    } while(p->type == diRun);
  }
  if (p->type == diParagraph) /* propagate in all next paras */
  {
    do {
      p->member.para.nCharOfs += shift;
      assert(p->member.para.nCharOfs >= 0);
      p = p->member.para.next_para;
    } while(p->type == diParagraph);
  }
  if (p->type == diTextEnd)
  {
    p->member.para.nCharOfs += shift;
    assert(p->member.para.nCharOfs >= 0);
  }
}

void ME_CheckCharOffsets(ME_TextEditor *editor)
{
  ME_DisplayItem *p = editor->pBuffer->pFirst;
  int ofs = 0, ofsp = 0;
  if(TRACE_ON(richedit_lists))
  {
    TRACE_(richedit_lists)("---\n");
    ME_DumpDocument(editor->pBuffer);
  }
  do {
    p = ME_FindItemFwd(p, diRunOrParagraphOrEnd);
    switch(p->type) {
      case diTextEnd:
        TRACE_(richedit_check)("tend, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
        assert(ofsp+ofs == p->member.para.nCharOfs);
        return;
      case diParagraph:
        TRACE_(richedit_check)("para, real ofsp = %d, counted = %d\n", p->member.para.nCharOfs, ofsp+ofs);
        assert(ofsp+ofs == p->member.para.nCharOfs);
        ofsp = p->member.para.nCharOfs;
        ofs = 0;
        break;
      case diRun:
        TRACE_(richedit_check)("run, real ofs = %d (+ofsp = %d), counted = %d, len = %d, txt = \"%s\", flags=%08x, fx&mask = %08lx\n",
          p->member.run.nCharOfs, p->member.run.nCharOfs+ofsp, ofsp+ofs,
          p->member.run.strText->nLen, debugstr_w(p->member.run.strText->szData),
          p->member.run.nFlags,
          p->member.run.style->fmt.dwMask & p->member.run.style->fmt.dwEffects);
        assert(ofs == p->member.run.nCharOfs);
        if (p->member.run.nFlags & MERF_ENDPARA)
          ofs += (editor->bEmulateVersion10 ? 2 : 1);
        else
          ofs += ME_StrLen(p->member.run.strText);
        break;
      default:
        assert(0);
    }
  } while(1);
}

int ME_CharOfsFromRunOfs(ME_TextEditor *editor, ME_DisplayItem *pRun, int nOfs)
{
  ME_DisplayItem *pPara;

  assert(pRun->type == diRun);
  assert(pRun->member.run.nCharOfs != -1);

  pPara = ME_FindItemBack(pRun, diParagraph);
  assert(pPara);
  assert(pPara->type==diParagraph);
  return pPara->member.para.nCharOfs + pRun->member.run.nCharOfs
    + ME_VPosToPos(pRun->member.run.strText, nOfs);
}

void ME_CursorFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_Cursor *pCursor)
{
  ME_RunOfsFromCharOfs(editor, nCharOfs, &pCursor->pRun, &pCursor->nOffset);
}

void ME_RunOfsFromCharOfs(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem **ppRun, int *pOfs)
{
  ME_DisplayItem *pPara;
  int nParaOfs;

  pPara = editor->pBuffer->pFirst->member.para.next_para;
  assert(pPara);
  assert(ppRun);
  assert(pOfs);
  while (pPara->type == diParagraph)
  {
    nParaOfs = pPara->member.para.nCharOfs;
    assert(nCharOfs >= nParaOfs);

    if (nCharOfs < pPara->member.para.next_para->member.para.nCharOfs)
    {
      int eollen = 1;
      *ppRun = ME_FindItemFwd(pPara, diRun);
      assert(*ppRun);
      while (!((*ppRun)->member.run.nFlags & MERF_ENDPARA))
      {
        ME_DisplayItem *pNext = ME_FindItemFwd(*ppRun, diRun);
        assert(pNext);
        assert(pNext->type == diRun);
        if (nCharOfs < nParaOfs + pNext->member.run.nCharOfs) {
          *pOfs = ME_PosToVPos((*ppRun)->member.run.strText,
            nCharOfs - nParaOfs - (*ppRun)->member.run.nCharOfs);
          return;
        }
        *ppRun = pNext;
      }
      /* the handling of bEmulateVersion10 may be a source of many bugs, I'm afraid */
      eollen = (editor->bEmulateVersion10 ? 2 : 1);
      if (nCharOfs >= nParaOfs + (*ppRun)->member.run.nCharOfs &&
        nCharOfs < nParaOfs + (*ppRun)->member.run.nCharOfs + eollen) {
        *pOfs = 0;
        return;
      }
    }
    pPara = pPara->member.para.next_para;
  }
  *ppRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  *pOfs = 0;
  assert((*ppRun)->member.run.nFlags & MERF_ENDPARA);
}

void ME_JoinRuns(ME_TextEditor *editor, ME_DisplayItem *p)
{
  ME_DisplayItem *pNext = p->next;
  int i;
  assert(p->type == diRun && pNext->type == diRun);
  assert(p->member.run.nCharOfs != -1);
  ME_GetParagraph(p)->member.para.nFlags |= MEPF_REWRAP;

  if (editor->bCaretAtEnd && editor->pCursors[0].pRun == pNext)
    editor->bCaretAtEnd = FALSE;
  for (i=0; i<editor->nCursors; i++) {
    if (editor->pCursors[i].pRun == pNext) {
      editor->pCursors[i].pRun = p;
      editor->pCursors[i].nOffset += ME_StrVLen(p->member.run.strText);
    }
  }

  ME_AppendString(p->member.run.strText, pNext->member.run.strText);
  ME_Remove(pNext);
  ME_DestroyDisplayItem(pNext);
  ME_UpdateRunFlags(editor, &p->member.run);
  if(TRACE_ON(richedit))
  {
    TRACE("Before check after join\n");
    ME_CheckCharOffsets(editor);
    TRACE("After check after join\n");
  }
}

ME_DisplayItem *ME_SplitRun(ME_Context *c, ME_DisplayItem *item, int nVChar)
{
  ME_TextEditor *editor = c->editor;
  ME_DisplayItem *item2 = NULL;
  ME_Run *run, *run2;
  ME_Paragraph *para = &ME_GetParagraph(item)->member.para;

  assert(item->member.run.nCharOfs != -1);
  if(TRACE_ON(richedit))
  {
    TRACE("Before check before split\n");
    ME_CheckCharOffsets(editor);
    TRACE("After check before split\n");
  }

  run = &item->member.run;

  TRACE("Before split: %s(%ld, %ld)\n", debugstr_w(run->strText->szData),
        run->pt.x, run->pt.y);

  item2 = ME_SplitRunSimple(editor, item, nVChar);

  run2 = &item2->member.run;

  ME_CalcRunExtent(c, para, run);
  ME_CalcRunExtent(c, para, run2);

  run2->pt.x = run->pt.x+run->nWidth;
  run2->pt.y = run->pt.y;

  if(TRACE_ON(richedit))
  {
    TRACE("Before check after split\n");
    ME_CheckCharOffsets(editor);
    TRACE("After check after split\n");
    TRACE("After split: %s(%ld, %ld), %s(%ld, %ld)\n",
      debugstr_w(run->strText->szData), run->pt.x, run->pt.y,
      debugstr_w(run2->strText->szData), run2->pt.x, run2->pt.y);
  }

  return item2;
}

/* split a run starting from voffset */
ME_DisplayItem *ME_SplitRunSimple(ME_TextEditor *editor, ME_DisplayItem *item, int nVChar)
{
  ME_Run *run = &item->member.run;
  ME_DisplayItem *item2;
  ME_Run *run2;
  int i;
  assert(nVChar > 0 && nVChar < ME_StrVLen(run->strText));
  assert(item->type == diRun);
  assert(!(item->member.run.nFlags & (MERF_GRAPHICS | MERF_TAB)));
  assert(item->member.run.nCharOfs != -1);

  item2 = ME_MakeRun(run->style,
      ME_VSplitString(run->strText, nVChar), run->nFlags&MERF_SPLITMASK);

  item2->member.run.nCharOfs = item->member.run.nCharOfs+
    ME_VPosToPos(item->member.run.strText, nVChar);

  run2 = &item2->member.run;
  ME_InsertBefore(item->next, item2);

  ME_UpdateRunFlags(editor, run);
  ME_UpdateRunFlags(editor, run2);
  for (i=0; i<editor->nCursors; i++) {
    if (editor->pCursors[i].pRun == item &&
        editor->pCursors[i].nOffset >= nVChar) {
      assert(item2->type == diRun);
      editor->pCursors[i].pRun = item2;
      editor->pCursors[i].nOffset -= nVChar;
    }
  }
  ME_GetParagraph(item)->member.para.nFlags |= MEPF_REWRAP;
  return item2;
}

ME_DisplayItem *ME_MakeRun(ME_Style *s, ME_String *strData, int nFlags)
{
  ME_DisplayItem *item = ME_MakeDI(diRun);
  item->member.run.style = s;
  item->member.run.strText = strData;
  item->member.run.nFlags = nFlags;
  item->member.run.nCharOfs = -1;
  ME_AddRefStyle(s);
  return item;
}

ME_DisplayItem *ME_InsertRun(ME_TextEditor *editor, int nCharOfs, ME_DisplayItem *pItem)
{
  ME_Cursor tmp;
  ME_DisplayItem *pDI;
  ME_UndoItem *pUI;

  assert(pItem->type == diRun || pItem->type == diUndoInsertRun);

  pUI = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
  if (pUI) {
    pUI->nStart = nCharOfs;
    pUI->nLen = pItem->member.run.strText->nLen;
  }
  ME_CursorFromCharOfs(editor, nCharOfs, &tmp);
  if (tmp.nOffset) {
    tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
    tmp.nOffset = 0;
  }
  pDI = ME_MakeRun(pItem->member.run.style, ME_StrDup(pItem->member.run.strText), pItem->member.run.nFlags);
  pDI->member.run.nCharOfs = tmp.pRun->member.run.nCharOfs;
  ME_InsertBefore(tmp.pRun, pDI);
  TRACE("Shift length:%d\n", pDI->member.run.strText->nLen);
  ME_PropagateCharOffset(tmp.pRun, pDI->member.run.strText->nLen);
  ME_GetParagraph(tmp.pRun)->member.para.nFlags |= MEPF_REWRAP;

  return pDI;
}

void ME_UpdateRunFlags(ME_TextEditor *editor, ME_Run *run)
{
  assert(run->nCharOfs != -1);
  if (ME_IsSplitable(run->strText))
    run->nFlags |= MERF_SPLITTABLE;
  else
    run->nFlags &= ~MERF_SPLITTABLE;

  if (!(run->nFlags & MERF_NOTEXT)) {
    if (ME_IsWhitespaces(run->strText))
      run->nFlags |= MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE;
    else
    {
      run->nFlags &= ~MERF_WHITESPACE;

      if (ME_IsWSpace(ME_GetCharFwd(run->strText,0)))
        run->nFlags |= MERF_STARTWHITE;
      else
        run->nFlags &= ~MERF_STARTWHITE;

      if (ME_IsWSpace(ME_GetCharBack(run->strText,0)))
        run->nFlags |= MERF_ENDWHITE;
      else
        run->nFlags &= ~MERF_ENDWHITE;
    }
  }
  else
    run->nFlags &= ~(MERF_WHITESPACE | MERF_STARTWHITE | MERF_ENDWHITE);
}

void ME_GetGraphicsSize(ME_TextEditor *editor, ME_Run *run, SIZE *pSize)
{
  assert(run->nFlags & MERF_GRAPHICS);
  pSize->cx = 64;