caret.c 48.4 KB
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/*
 * RichEdit - Caret and selection functions.
 *
 * Copyright 2004 by Krzysztof Foltman
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 * Copyright 2005 by Phil Krylov
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 *
 * 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
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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 */


#include "editor.h"

WINE_DEFAULT_DEBUG_CHANNEL(richedit);

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void ME_SetCursorToStart(ME_TextEditor *editor, ME_Cursor *cursor)
{
  cursor->pPara = editor->pBuffer->pFirst->member.para.next_para;
  cursor->pRun = ME_FindItemFwd(cursor->pPara, diRun);
  cursor->nOffset = 0;
}

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static void ME_SetCursorToEnd(ME_TextEditor *editor, ME_Cursor *cursor)
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{
  cursor->pPara = editor->pBuffer->pLast->member.para.prev_para;
  cursor->pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  cursor->nOffset = 0;
}


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int ME_GetSelectionOfs(ME_TextEditor *editor, int *from, int *to)
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{
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  *from = ME_GetCursorOfs(&editor->pCursors[0]);
  *to =   ME_GetCursorOfs(&editor->pCursors[1]);
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  if (*from > *to)
  {
    int tmp = *from;
    *from = *to;
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    *to = tmp;
    return 1;
  }
  return 0;
}

int ME_GetSelection(ME_TextEditor *editor, ME_Cursor **from, ME_Cursor **to)
{
  if (ME_GetCursorOfs(&editor->pCursors[0]) < ME_GetCursorOfs(&editor->pCursors[1]))
  {
    *from = &editor->pCursors[0];
    *to = &editor->pCursors[1];
    return 0;
  } else {
    *from = &editor->pCursors[1];
    *to = &editor->pCursors[0];
    return 1;
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  }
}

int ME_GetTextLength(ME_TextEditor *editor)
{
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  ME_Cursor cursor;
  ME_SetCursorToEnd(editor, &cursor);
  return ME_GetCursorOfs(&cursor);
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}

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int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
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{
  int length;
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  if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
    return E_INVALIDARG;
  if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
    return E_INVALIDARG;
  
  length = ME_GetTextLength(editor);
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  if ((editor->styleFlags & ES_MULTILINE)
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        && (how->flags & GTL_USECRLF)
        && !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
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    length += editor->nParagraphs - 1;
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  if (how->flags & GTL_NUMBYTES)
  {
    CPINFO cpinfo;
    
    if (how->codepage == 1200)
      return length * 2;
    if (how->flags & GTL_PRECISE)
      FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
    if (GetCPInfo(how->codepage, &cpinfo))
      return length * cpinfo.MaxCharSize;
    ERR("Invalid codepage %u\n", how->codepage);
    return E_INVALIDARG;
  }
  return length; 
}


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int ME_SetSelection(ME_TextEditor *editor, int from, int to)
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{
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  int selectionEnd = 0;
  const int len = ME_GetTextLength(editor);

  /* all negative values are effectively the same */
  if (from < 0)
    from = -1;
  if (to < 0)
    to = -1;

  /* select all */
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  if (from == 0 && to == -1)
  {
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    ME_SetCursorToStart(editor, &editor->pCursors[1]);
    ME_SetCursorToEnd(editor, &editor->pCursors[0]);
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    ME_InvalidateSelection(editor);
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    ME_ClearTempStyle(editor);
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    return len + 1;
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  }
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  /* if both values are equal and also out of bound, that means to */
  /* put the selection at the end of the text */
  if ((from == to) && (to < 0 || to > len))
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  {
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    selectionEnd = 1;
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  }
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  else
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  {
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    /* if from is negative and to is positive then selection is */
    /* deselected and caret moved to end of the current selection */
    if (from < 0)
    {
      int start, end;
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      ME_GetSelectionOfs(editor, &start, &end);
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      editor->pCursors[1] = editor->pCursors[0];
      ME_Repaint(editor);
      ME_ClearTempStyle(editor);
      return end;
    }

    /* adjust to if it's a negative value */
    if (to < 0)
      to = len + 1;

    /* flip from and to if they are reversed */
    if (from>to)
    {
      int tmp = from;
      from = to;
      to = tmp;
    }

    /* after fiddling with the values, we find from > len && to > len */
    if (from > len)
      selectionEnd = 1;
    /* special case with to too big */
    else if (to > len)
      to = len + 1;
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  }
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  if (selectionEnd)
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  {
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    ME_SetCursorToEnd(editor, &editor->pCursors[0]);
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    editor->pCursors[1] = editor->pCursors[0];
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    ME_InvalidateSelection(editor);
    ME_ClearTempStyle(editor);
    return len;
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  }
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  ME_CursorFromCharOfs(editor, from, &editor->pCursors[1]);
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  editor->pCursors[0] = editor->pCursors[1];
  ME_MoveCursorChars(editor, &editor->pCursors[0], to - from);
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  /* Selection is not allowed in the middle of an end paragraph run. */
  if (editor->pCursors[1].pRun->member.run.nFlags & MERF_ENDPARA)
    editor->pCursors[1].nOffset = 0;
  if (editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA)
    editor->pCursors[0].nOffset = 0;
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  return to;
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}


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static void
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ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
                        int *x, int *y, int *height)
{
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  ME_DisplayItem *row;
  ME_DisplayItem *run = pCursor->pRun;
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  ME_DisplayItem *para = pCursor->pPara;
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  ME_DisplayItem *pSizeRun = run;
  ME_Context c;
  SIZE sz = {0, 0};
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  assert(height && x && y);
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  assert(~para->member.para.nFlags & MEPF_REWRAP);
  assert(run && run->type == diRun);
  assert(para && para->type == diParagraph);

  row = ME_FindItemBack(run, diStartRowOrParagraph);
  assert(row && row->type == diStartRow);

  ME_InitContext(&c, editor, ITextHost_TxGetDC(editor->texthost));

  if (!pCursor->nOffset)
  {
    ME_DisplayItem *prev = ME_FindItemBack(run, diRunOrParagraph);
    assert(prev);
    if (prev->type == diRun)
      pSizeRun = prev;
  }
  if (editor->bCaretAtEnd && !pCursor->nOffset &&
      run == ME_FindItemFwd(row, diRun))
  {
    ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
    assert(tmp);
    if (tmp->type == diRun)
    {
      row = ME_FindItemBack(tmp, diStartRow);
      pSizeRun = run = tmp;
      assert(run);
      assert(run->type == diRun);
      sz = ME_GetRunSize(&c, &para->member.para,
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                         &run->member.run, run->member.run.strText->nLen,
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                         row->member.row.nLMargin);
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    }
  }
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  if (pCursor->nOffset) {
    sz = ME_GetRunSize(&c, &para->member.para, &run->member.run,
                       pCursor->nOffset, row->member.row.nLMargin);
  }

  *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
  *x = c.rcView.left + run->member.run.pt.x + sz.cx - editor->horz_si.nPos;
  *y = c.rcView.top + para->member.para.pt.y + row->member.row.nBaseline
       + run->member.run.pt.y - pSizeRun->member.run.nAscent
       - editor->vert_si.nPos;
  ME_DestroyContext(&c);
  return;
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}


void
ME_MoveCaret(ME_TextEditor *editor)
{
  int x, y, height;

  ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
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  if(editor->bHaveFocus && !ME_IsSelection(editor))
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  {
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    x = min(x, editor->rcFormat.right-1);
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    ITextHost_TxCreateCaret(editor->texthost, NULL, 0, height);
    ITextHost_TxSetCaretPos(editor->texthost, x, y);
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  }
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}

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void ME_ShowCaret(ME_TextEditor *ed)
{
  ME_MoveCaret(ed);
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  if(ed->bHaveFocus && !ME_IsSelection(ed))
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    ITextHost_TxShowCaret(ed->texthost, TRUE);
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}

void ME_HideCaret(ME_TextEditor *ed)
{
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  if(!ed->bHaveFocus || ME_IsSelection(ed))
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  {
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    ITextHost_TxShowCaret(ed->texthost, FALSE);
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    DestroyCaret();
  }
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}

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BOOL ME_InternalDeleteText(ME_TextEditor *editor, ME_Cursor *start,
                           int nChars, BOOL bForce)
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{
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  ME_Cursor c = *start;
  int nOfs = ME_GetCursorOfs(start);
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  int shift = 0;
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  int totalChars = nChars;
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  ME_DisplayItem *start_para;

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  /* Prevent deletion past last end of paragraph run. */
  nChars = min(nChars, ME_GetTextLength(editor) - nOfs);
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  start_para = c.pPara;
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  if (!bForce)
  {
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    ME_ProtectPartialTableDeletion(editor, &c, &nChars);
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    if (nChars == 0)
      return FALSE;
  }

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  while(nChars > 0)
  {
    ME_Run *run;
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    ME_CursorFromCharOfs(editor, nOfs+nChars, &c);
    if (!c.nOffset &&
        nOfs+nChars == (c.pRun->member.run.nCharOfs
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                        + c.pPara->member.para.nCharOfs))
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    {
      /* We aren't deleting anything in this run, so we will go back to the
       * last run we are deleting text in. */
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      ME_PrevRun(&c.pPara, &c.pRun);
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      c.nOffset = c.pRun->member.run.strText->nLen;
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    }
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    run = &c.pRun->member.run;
    if (run->nFlags & MERF_ENDPARA) {
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      int eollen = c.pRun->member.run.strText->nLen;
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      BOOL keepFirstParaFormat;
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      if (!ME_FindItemFwd(c.pRun, diParagraph))
      {
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        return TRUE;
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      }
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      keepFirstParaFormat = (totalChars == nChars && nChars <= eollen &&
                             run->nCharOfs);
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      if (!editor->bEmulateVersion10) /* v4.1 */
      {
        ME_DisplayItem *next_para = ME_FindItemFwd(c.pRun, diParagraphOrEnd);
        ME_DisplayItem *this_para = next_para->member.para.prev_para;

        /* The end of paragraph before a table row is only deleted if there
         * is nothing else on the line before it. */
        if (this_para == start_para &&
            next_para->member.para.nFlags & MEPF_ROWSTART)
        {
          /* If the paragraph will be empty, then it should be deleted, however
           * it still might have text right now which would inherit the
           * MEPF_STARTROW property if we joined it right now.
           * Instead we will delete it after the preceding text is deleted. */
          if (nOfs > this_para->member.para.nCharOfs) {
            /* Skip this end of line. */
            nChars -= (eollen < nChars) ? eollen : nChars;
            continue;
          }
          keepFirstParaFormat = TRUE;
        }
      }
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      ME_JoinParagraphs(editor, c.pPara, keepFirstParaFormat);
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      /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
      ME_CheckCharOffsets(editor);
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      nChars -= (eollen < nChars) ? eollen : nChars;
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      continue;
    }
    else
    {
      ME_Cursor cursor;
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      int nCharsToDelete = min(nChars, c.nOffset);
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      int i;
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      c.nOffset -= nCharsToDelete;

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      ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
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      cursor = c;
      /* nChars is the number of characters that should be deleted from the
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         PRECEDING runs (these BEFORE cursor.pRun)
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         nCharsToDelete is a number of chars to delete from THIS run */
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      nChars -= nCharsToDelete;
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      shift -= nCharsToDelete;
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      TRACE("Deleting %d (remaning %d) chars at %d in '%s' (%d)\n",
        nCharsToDelete, nChars, c.nOffset,
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        debugstr_w(run->strText->szData), run->strText->nLen);

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      if (!c.nOffset && run->strText->nLen == nCharsToDelete)
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      {
        /* undo = reinsert whole run */
        /* nOfs is a character offset (from the start of the document
           to the current (deleted) run */
        ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
        if (pUndo)
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          pUndo->di.member.run.nCharOfs = nOfs+nChars;
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      }
      else
      {
        /* undo = reinsert partial run */
        ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
        if (pUndo) {
          ME_DestroyString(pUndo->di.member.run.strText);
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          pUndo->di.member.run.nCharOfs = nOfs+nChars;
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          pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
        }
      }
      TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
      TRACE("Shift value: %d\n", shift);
      ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
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      /* update cursors (including c) */
      for (i=-1; i<editor->nCursors; i++) {
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        ME_Cursor *pThisCur = editor->pCursors + i;
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        if (i == -1) pThisCur = &c;
        if (pThisCur->pRun == cursor.pRun) {
          if (pThisCur->nOffset > cursor.nOffset) {
            if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
              pThisCur->nOffset = cursor.nOffset;
            else
              pThisCur->nOffset -= nCharsToDelete;
            assert(pThisCur->nOffset >= 0);
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            assert(pThisCur->nOffset <= run->strText->nLen);
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          }
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          if (pThisCur->nOffset == run->strText->nLen)
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          {
            pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
            assert(pThisCur->pRun->type == diRun);
            pThisCur->nOffset = 0;
          }
        }
      }
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      /* c = updated data now */
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      if (c.pRun == cursor.pRun)
        ME_SkipAndPropagateCharOffset(c.pRun, shift);
      else
        ME_PropagateCharOffset(c.pRun, shift);

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      if (!cursor.pRun->member.run.strText->nLen)
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      {
        TRACE("Removing useless run\n");
        ME_Remove(cursor.pRun);
        ME_DestroyDisplayItem(cursor.pRun);
      }
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      shift = 0;
      /*
      ME_CheckCharOffsets(editor);
      */
      continue;
    }
  }
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  return TRUE;
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}

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BOOL ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, int nChars)
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{
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  assert(nCursor>=0 && nCursor<editor->nCursors);
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  /* text operations set modified state */
  editor->nModifyStep = 1;
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  return ME_InternalDeleteText(editor, &editor->pCursors[nCursor],
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                               nChars, FALSE);
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}

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static ME_DisplayItem *
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ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
                                const WCHAR *str, int len, ME_Style *style,
                                int flags)
{
  ME_Cursor *p = &editor->pCursors[nCursor];

  editor->bCaretAtEnd = FALSE;
  
  assert(p->pRun->type == diRun);
  
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  return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
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}


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void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
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{
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  ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
  ME_DisplayItem        *di;
  WCHAR                 space = ' ';
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  /* FIXME no no no */
  if (ME_IsSelection(editor))
    ME_DeleteSelection(editor);

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  di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
                                       MERF_GRAPHICS);
  di->member.run.ole_obj = ALLOC_OBJ(*reo);
  ME_CopyReObject(di->member.run.ole_obj, reo);
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  ME_ReleaseStyle(pStyle);
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}


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void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
{
  ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
  ME_DisplayItem        *di;
  WCHAR                 space = ' ';

  /* FIXME no no no */
  if (ME_IsSelection(editor))
    ME_DeleteSelection(editor);

  di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
                                       MERF_ENDROW);
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  ME_ReleaseStyle(pStyle);
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}

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void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor, 
  const WCHAR *str, int len, ME_Style *style)
{
  const WCHAR *pos;
  ME_Cursor *p = NULL;
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  int oldLen;
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  /* FIXME really HERE ? */
  if (ME_IsSelection(editor))
    ME_DeleteSelection(editor);

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  /* FIXME: is this too slow? */
  /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
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  oldLen = ME_GetTextLength(editor);
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  /* text operations set modified state */
  editor->nModifyStep = 1;

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  assert(style);

  assert(nCursor>=0 && nCursor<editor->nCursors);
  if (len == -1)
    len = lstrlenW(str);
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  /* grow the text limit to fit our text */
  if(editor->nTextLimit < oldLen +len)
    editor->nTextLimit = oldLen + len;

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  pos = str;

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  while (len)
  {
    /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
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    while(pos - str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
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      pos++;
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    if (pos != str) { /* handle text */
      ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
    } else if (*pos == '\t') { /* handle tabs */
      WCHAR tab = '\t';
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      ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
      pos++;
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    } else { /* handle EOLs */
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      ME_DisplayItem *tp, *end_run;
      ME_Style *tmp_style;
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      int eol_len = 0;
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      /* Find number of CR and LF in end of paragraph run */
      if (*pos =='\r')
      {
        if (len > 1 && pos[1] == '\n')
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          eol_len = 2;
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        else if (len > 2 && pos[1] == '\r' && pos[2] == '\n')
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          eol_len = 3;
        else
          eol_len = 1;
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      } else {
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        assert(*pos == '\n');
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        eol_len = 1;
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      }
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      pos += eol_len;
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      if (!editor->bEmulateVersion10 && eol_len == 3)
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      {
        /* handle special \r\r\n sequence (richedit 2.x and higher only) */
        WCHAR space = ' ';
        ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
      } else {
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        ME_String *eol_str;

        if (!editor->bEmulateVersion10) {
          WCHAR cr = '\r';
          eol_str = ME_MakeStringN(&cr, 1);
        } else {
          eol_str = ME_MakeStringN(str, eol_len);
        }
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        p = &editor->pCursors[nCursor];
        if (p->nOffset) {
          ME_SplitRunSimple(editor, p->pRun, p->nOffset);
          p = &editor->pCursors[nCursor];
        }
        tmp_style = ME_GetInsertStyle(editor, nCursor);
        /* ME_SplitParagraph increases style refcount */
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        tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, eol_str, 0);
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        p->pRun = ME_FindItemFwd(tp, diRun);
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        p->pPara = tp;
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        end_run = ME_FindItemBack(tp, diRun);
        ME_ReleaseStyle(end_run->member.run.style);
        end_run->member.run.style = tmp_style;
        p->nOffset = 0;
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      }
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    }
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    len -= pos - str;
    str = pos;
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  }
}

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/* Move the cursor nRelOfs characters (either forwards or backwards)
 *
 * returns the actual number of characters moved.
 **/
int ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
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{
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  cursor->nOffset += nRelOfs;
  if (cursor->nOffset < 0)
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  {
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    cursor->nOffset += cursor->pRun->member.run.nCharOfs;
    if (cursor->nOffset >= 0)
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    {
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      /* new offset in the same paragraph */
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      do {
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        cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
      } while (cursor->nOffset < cursor->pRun->member.run.nCharOfs);
      cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
      return nRelOfs;
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    }
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    cursor->nOffset += cursor->pPara->member.para.nCharOfs;
    if (cursor->nOffset <= 0)
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    {
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      /* moved to the start of the text */
      nRelOfs -= cursor->nOffset;
      ME_SetCursorToStart(editor, cursor);
      return nRelOfs;
    }
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    /* new offset in a previous paragraph */
    do {
      cursor->pPara = cursor->pPara->member.para.prev_para;
    } while (cursor->nOffset < cursor->pPara->member.para.nCharOfs);
    cursor->nOffset -= cursor->pPara->member.para.nCharOfs;

    cursor->pRun = ME_FindItemBack(cursor->pPara->member.para.next_para, diRun);
    while (cursor->nOffset < cursor->pRun->member.run.nCharOfs) {
      cursor->pRun = ME_FindItemBack(cursor->pRun, diRun);
    }
    cursor->nOffset -= cursor->pRun->member.run.nCharOfs;
  } else if (cursor->nOffset >= cursor->pRun->member.run.strText->nLen) {
    ME_DisplayItem *next_para;
    int new_offset;

    new_offset = ME_GetCursorOfs(cursor);
    next_para = cursor->pPara->member.para.next_para;
    if (new_offset < next_para->member.para.nCharOfs)
    {
      /* new offset in the same paragraph */
      do {
        cursor->nOffset -= cursor->pRun->member.run.strText->nLen;
        cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
      } while (cursor->nOffset >= cursor->pRun->member.run.strText->nLen);
      return nRelOfs;
655
    }
656 657 658 659 660 661 662 663 664 665

    if (new_offset >= ME_GetTextLength(editor))
    {
      /* new offset at the end of the text */
      ME_SetCursorToEnd(editor, cursor);
      nRelOfs -= new_offset - ME_GetTextLength(editor);
      return nRelOfs;
    }

    /* new offset in a following paragraph */
666
    do {
667 668 669 670 671 672 673
      cursor->pPara = next_para;
      next_para = next_para->member.para.next_para;
    } while (new_offset >= next_para->member.para.nCharOfs);

    cursor->nOffset = new_offset - cursor->pPara->member.para.nCharOfs;
    cursor->pRun = ME_FindItemFwd(cursor->pPara, diRun);
    while (cursor->nOffset >= cursor->pRun->member.run.strText->nLen)
674
    {
675 676
      cursor->nOffset -= cursor->pRun->member.run.strText->nLen;
      cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
677
    }
678 679
  } /* else new offset is in the same run */
  return nRelOfs;
680 681
}

682

683 684 685 686
static BOOL
ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
{
  ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
687
  ME_DisplayItem *pPara = cursor->pPara;
688
  int nOffset = cursor->nOffset;
689

690 691 692 693 694 695 696
  if (nRelOfs == -1)
  {
    /* Backward movement */
    while (TRUE)
    {
      nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
                                     nOffset, WB_MOVEWORDLEFT);
697
      if (nOffset)
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
        break;
      pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
      if (pOtherRun->type == diRun)
      {
        if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
                                 pOtherRun->member.run.strText->nLen - 1,
                                 WB_ISDELIMITER)
            && !(pRun->member.run.nFlags & MERF_ENDPARA)
            && !(cursor->pRun == pRun && cursor->nOffset == 0)
            && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
                                     WB_ISDELIMITER))
          break;
        pRun = pOtherRun;
        nOffset = pOtherRun->member.run.strText->nLen;
      }
      else if (pOtherRun->type == diParagraph)
      {
        if (cursor->pRun == pRun && cursor->nOffset == 0)
        {
717
          pPara = pOtherRun;
718
          /* Skip empty start of table row paragraph */
719 720
          if (pPara->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
            pPara = pPara->member.para.prev_para;
721
          /* Paragraph breaks are treated as separate words */
722
          if (pPara->member.para.prev_para->type == diTextStart)
723
            return FALSE;
724

725
          pRun = ME_FindItemBack(pPara, diRun);
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
        }
        break;
      }
    }
  }
  else
  {
    /* Forward movement */
    BOOL last_delim = FALSE;
    
    while (TRUE)
    {
      if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
                                              nOffset, WB_ISDELIMITER))
        break;
      nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
                                     nOffset, WB_MOVEWORDRIGHT);
      if (nOffset < pRun->member.run.strText->nLen)
        break;
      pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
      if (pOtherRun->type == diRun)
      {
        last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
                                          nOffset - 1, WB_ISDELIMITER);
        pRun = pOtherRun;
        nOffset = 0;
      }
      else if (pOtherRun->type == diParagraph)
      {
755 756
        if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
            pOtherRun = pOtherRun->member.para.next_para;
757 758 759 760
        if (cursor->pRun == pRun) {
          pPara = pOtherRun;
          pRun = ME_FindItemFwd(pPara, diRun);
        }
761 762 763 764 765 766 767 768 769 770 771 772
        nOffset = 0;
        break;
      }
      else /* diTextEnd */
      {
        if (cursor->pRun == pRun)
          return FALSE;
        nOffset = 0;
        break;
      }
    }
  }
773
  cursor->pPara = pPara;
774 775 776 777
  cursor->pRun = pRun;
  cursor->nOffset = nOffset;
  return TRUE;
}
778

779

780
static void
781
ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
782
{
783 784
  /* pCursor[0] is the end of the selection
   * pCursor[1] is the start of the selection (or the position selection anchor)
785 786 787 788 789 790 791 792 793 794
   * pCursor[2] and [3] are the selection anchors that are backed up
   * so they are kept when the selection changes for drag selection.
   */

  editor->nSelectionType = selectionType;
  switch(selectionType)
  {
    case stPosition:
      break;
    case stWord:
795 796 797
      ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
      editor->pCursors[1] = editor->pCursors[0];
      ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
      break;
    case stLine:
    case stParagraph:
    {
      ME_DisplayItem *pItem;
      ME_DIType fwdSearchType, backSearchType;
      if (selectionType == stParagraph) {
          backSearchType = diParagraph;
          fwdSearchType = diParagraphOrEnd;
      } else {
          backSearchType = diStartRow;
          fwdSearchType = diStartRowOrParagraphOrEnd;
      }
      pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
      assert(pItem);
      if (pItem->type == diTextEnd)
814
          editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
815
      else
816
          editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
817
      editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
818 819 820 821
      editor->pCursors[0].nOffset = 0;

      pItem = ME_FindItemBack(pItem, backSearchType);
      editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
822
      editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
823 824 825
      editor->pCursors[1].nOffset = 0;
      break;
    }
826 827 828
    case stDocument:
      /* Select everything with cursor anchored from the start of the text */
      editor->nSelectionType = stDocument;
829 830
      ME_SetCursorToStart(editor, &editor->pCursors[1]);
      ME_SetCursorToEnd(editor, &editor->pCursors[0]);
831
      break;
832 833 834 835 836
    default: assert(0);
  }
  /* Store the anchor positions for extending the selection. */
  editor->pCursors[2] = editor->pCursors[0];
  editor->pCursors[3] = editor->pCursors[1];
837 838
}

839
int ME_GetCursorOfs(const ME_Cursor *cursor)
840
{
841 842
  return cursor->pPara->member.para.nCharOfs
         + cursor->pRun->member.run.nCharOfs + cursor->nOffset;
843 844
}

845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
/* Helper function for ME_FindPixelPos to find paragraph within tables */
static ME_DisplayItem* ME_FindPixelPosInTableRow(int x, int y,
                                                 ME_DisplayItem *para)
{
  ME_DisplayItem *cell, *next_cell;
  assert(para->member.para.nFlags & MEPF_ROWSTART);
  cell = para->member.para.next_para->member.para.pCell;
  assert(cell);

  /* find the cell we are in */
  while ((next_cell = cell->member.cell.next_cell) != NULL) {
    if (x < next_cell->member.cell.pt.x)
    {
      para = ME_FindItemFwd(cell, diParagraph);
      /* Found the cell, but there might be multiple paragraphs in
       * the cell, so need to search down the cell for the paragraph. */
      while (cell == para->member.para.pCell) {
        if (y < para->member.para.pt.y + para->member.para.nHeight)
        {
          if (para->member.para.nFlags & MEPF_ROWSTART)
            return ME_FindPixelPosInTableRow(x, y, para);
          else
            return para;
        }
        para = para->member.para.next_para;
      }
      /* Past the end of the cell, so go back to the last cell paragraph */
      return para->member.para.prev_para;
    }
    cell = next_cell;
  }
  /* Return table row delimiter */
  para = ME_FindItemFwd(cell, diParagraph);
  assert(para->member.para.nFlags & MEPF_ROWEND);
  assert(para->member.para.pFmt->dwMask & PFM_TABLEROWDELIMITER);
  assert(para->member.para.pFmt->wEffects & PFE_TABLEROWDELIMITER);
  return para;
}

884 885 886 887 888 889 890 891 892
static BOOL ME_ReturnFoundPos(ME_TextEditor *editor, ME_DisplayItem *found,
                               ME_Cursor *result, int rx, BOOL isExact)
{
  assert(found);
  assert(found->type == diRun);
  if ((found->member.run.nFlags & MERF_ENDPARA) || rx < 0)
    rx = 0;
  result->pRun = found;
  result->nOffset = ME_CharFromPointCursor(editor, rx, &found->member.run);
893
  if (result->nOffset == found->member.run.strText->nLen && rx)
894
  {
895
    result->pRun = ME_FindItemFwd(result->pRun, diRun);
896 897
    result->nOffset = 0;
  }
898
  result->pPara = ME_GetParagraph(result->pRun);
899 900 901
  return isExact;
}

902 903 904 905 906 907 908 909 910 911
/* Finds the run and offset from the pixel position.
 *
 * x & y are pixel positions in virtual coordinates into the rich edit control,
 * so client coordinates must first be adjusted by the scroll position.
 *
 * returns TRUE if the result was exactly under the cursor, otherwise returns
 * FALSE, and result is set to the closest position to the coordinates.
 */
static BOOL ME_FindPixelPos(ME_TextEditor *editor, int x, int y,
                            ME_Cursor *result, BOOL *is_eol)
912 913
{
  ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
914
  ME_DisplayItem *last = NULL;
915
  int rx = 0;
916
  BOOL isExact = TRUE;
917

918 919 920
  x -= editor->rcFormat.left;
  y -= editor->rcFormat.top;

921 922 923
  if (is_eol)
    *is_eol = 0;

924 925
  /* find paragraph */
  for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
926
  {
927
    assert(p->type == diParagraph);
928
    if (y < p->member.para.pt.y + p->member.para.nHeight)
929
    {
930 931 932
      if (p->member.para.nFlags & MEPF_ROWSTART)
        p = ME_FindPixelPosInTableRow(x, y, p);
      y -= p->member.para.pt.y;
933
      p = ME_FindItemFwd(p, diStartRow);
934
      break;
935 936
    } else if (p->member.para.nFlags & MEPF_ROWSTART) {
      p = ME_GetTableRowEnd(p);
937
    }
938 939 940 941 942 943
  }
  /* find row */
  for (; p != editor->pBuffer->pLast; )
  {
    ME_DisplayItem *pp;
    assert(p->type == diStartRow);
944
    if (y < p->member.row.pt.y + p->member.row.nHeight)
945
    {
946 947 948 949 950 951 952 953
        p = ME_FindItemFwd(p, diRun);
        break;
    }
    pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
    if (pp->type != diStartRow)
    {
        p = ME_FindItemFwd(p, diRun);
        break;
954
    }
955 956
    p = pp;
  }
957 958 959 960 961
  if (p == editor->pBuffer->pLast)
  {
    /* The position is below the last paragraph, so the last row will be used
     * rather than the end of the text, so the x position will be used to
     * determine the offset closest to the pixel position. */
962
    isExact = FALSE;
963 964 965 966 967 968 969 970 971
    p = ME_FindItemBack(p, diStartRow);
    if (p != NULL){
      p = ME_FindItemFwd(p, diRun);
    }
    else
    {
      p = editor->pBuffer->pLast;
    }
  }
972 973 974
  for (; p != editor->pBuffer->pLast; p = p->next)
  {
    switch (p->type)
975
    {
976
    case diRun:
977
      rx = x - p->member.run.pt.x;
978
      if (rx < p->member.run.nWidth)
979
        return ME_ReturnFoundPos(editor, p, result, rx, isExact);
980 981
      break;
    case diStartRow:
982
      isExact = FALSE;
983 984 985
      p = ME_FindItemFwd(p, diRun);
      if (is_eol) *is_eol = 1;
      rx = 0; /* FIXME not sure */
986
      return ME_ReturnFoundPos(editor, p, result, rx, isExact);
987
    case diCell:
988 989
    case diParagraph:
    case diTextEnd:
990
      isExact = FALSE;
991 992
      rx = 0; /* FIXME not sure */
      p = last;
993
      return ME_ReturnFoundPos(editor, p, result, rx, isExact);
994
    default: assert(0);
995
    }
996
    last = p;
997 998
  }
  result->pRun = ME_FindItemBack(p, diRun);
999
  result->pPara = ME_GetParagraph(result->pRun);
1000 1001
  result->nOffset = 0;
  assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
1002
  return FALSE;
1003 1004
}

1005

1006
/* Sets the cursor to the position closest to the pixel position
1007 1008 1009 1010 1011
 *
 * x & y are pixel positions in client coordinates.
 *
 * isExact will be set to TRUE if the run is directly under the pixel
 * position, FALSE if it not, unless isExact is set to NULL.
1012 1013 1014
 *
 * return FALSE if outside client area and the cursor is not set,
 * otherwise TRUE is returned.
1015
 */
1016 1017
BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y,
                    ME_Cursor *cursor, BOOL *isExact)
1018 1019
{
  RECT rc;
1020
  BOOL bResult;
1021

1022
  ITextHost_TxGetClientRect(editor->texthost, &rc);
1023 1024
  if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
    if (isExact) *isExact = FALSE;
1025
    return FALSE;
1026
  }
1027 1028
  x += editor->horz_si.nPos;
  y += editor->vert_si.nPos;
1029
  bResult = ME_FindPixelPos(editor, x, y, cursor, NULL);
1030
  if (isExact) *isExact = bResult;
1031
  return TRUE;
1032 1033
}

1034 1035


1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
/* Extends the selection with a word, line, or paragraph selection type.
 *
 * The selection is anchored by editor->pCursors[2-3] such that the text
 * between the anchors will remain selected, and one end will be extended.
 *
 * editor->pCursors[0] should have the position to extend the selection to
 * before this function is called.
 *
 * Nothing will be done if editor->nSelectionType equals stPosition.
 */
static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
{
  ME_Cursor tmp_cursor;
  int curOfs, anchorStartOfs, anchorEndOfs;
1050
  if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
1051
      return;
1052 1053 1054
  curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
  anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
  anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
1055 1056 1057 1058 1059 1060 1061

  tmp_cursor = editor->pCursors[0];
  editor->pCursors[0] = editor->pCursors[2];
  editor->pCursors[1] = editor->pCursors[3];
  if (curOfs < anchorStartOfs)
  {
      /* Extend the left side of selection */
1062
      editor->pCursors[1] = tmp_cursor;
1063
      if (editor->nSelectionType == stWord)
1064
          ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
1065 1066 1067
      else
      {
          ME_DisplayItem *pItem;
1068 1069
          ME_DIType searchType = ((editor->nSelectionType == stLine) ?
                                  diStartRowOrParagraph:diParagraph);
1070 1071
          pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
          editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
1072
          editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
1073
          editor->pCursors[1].nOffset = 0;
1074 1075 1076 1077 1078
      }
  }
  else if (curOfs >= anchorEndOfs)
  {
      /* Extend the right side of selection */
1079
      editor->pCursors[0] = tmp_cursor;
1080
      if (editor->nSelectionType == stWord)
1081
          ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
1082 1083 1084
      else
      {
          ME_DisplayItem *pItem;
1085 1086
          ME_DIType searchType = ((editor->nSelectionType == stLine) ?
                                  diStartRowOrParagraphOrEnd:diParagraphOrEnd);
1087
          pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
1088
          if (pItem->type == diTextEnd)
1089
              editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
1090
          else
1091
              editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
1092
          editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
1093
          editor->pCursors[0].nOffset = 0;
1094 1095 1096
      }
  }
}
1097

1098
void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1099 1100 1101
{
  ME_Cursor tmp_cursor;
  int is_selection = 0;
1102
  BOOL is_shift;
1103

1104
  editor->nUDArrowX = -1;
1105 1106 1107

  x += editor->horz_si.nPos;
  y += editor->vert_si.nPos;
1108 1109 1110

  tmp_cursor = editor->pCursors[0];
  is_selection = ME_IsSelection(editor);
1111
  is_shift = GetKeyState(VK_SHIFT) < 0;
1112

1113 1114
  ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);

1115
  if (x >= editor->rcFormat.left || is_shift)
1116
  {
1117 1118 1119
    if (clickNum > 1)
    {
      editor->pCursors[1] = editor->pCursors[0];
1120
      if (is_shift) {
1121
          if (x >= editor->rcFormat.left)
1122 1123 1124 1125
              ME_SelectByType(editor, stWord);
          else
              ME_SelectByType(editor, stParagraph);
      } else if (clickNum % 2 == 0) {
1126
          ME_SelectByType(editor, stWord);
1127
      } else {
1128
          ME_SelectByType(editor, stParagraph);
1129
      }
1130
    }
1131
    else if (!is_shift)
1132
    {
1133
      editor->nSelectionType = stPosition;
1134 1135
      editor->pCursors[1] = editor->pCursors[0];
    }
1136 1137 1138
    else if (!is_selection)
    {
      editor->nSelectionType = stPosition;
1139
      editor->pCursors[1] = tmp_cursor;
1140 1141 1142 1143
    }
    else if (editor->nSelectionType != stPosition)
    {
      ME_ExtendAnchorSelection(editor);
1144
    }
1145 1146 1147
  }
  else
  {
1148 1149
    if (clickNum < 2) {
        ME_SelectByType(editor, stLine);
1150
    } else if (clickNum % 2 == 0 || is_shift) {
1151
        ME_SelectByType(editor, stParagraph);
1152 1153
    } else {
        ME_SelectByType(editor, stDocument);
1154
    }
1155
  }
1156
  ME_InvalidateSelection(editor);
1157
  ITextHost_TxShowCaret(editor->texthost, FALSE);
1158
  ME_ShowCaret(editor);
1159 1160
  ME_ClearTempStyle(editor);
  ME_SendSelChange(editor);
1161 1162 1163 1164 1165
}

void ME_MouseMove(ME_TextEditor *editor, int x, int y)
{
  ME_Cursor tmp_cursor;
1166

1167 1168
  if (editor->nSelectionType == stDocument)
      return;
1169 1170
  x += editor->horz_si.nPos;
  y += editor->vert_si.nPos;
1171 1172

  tmp_cursor = editor->pCursors[0];
1173
  /* FIXME: do something with the return value of ME_FindPixelPos */
1174
  ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1175

1176
  ME_InvalidateSelection(editor);
1177 1178 1179 1180 1181
  editor->pCursors[0] = tmp_cursor;
  ME_ExtendAnchorSelection(editor);

  if (editor->nSelectionType != stPosition &&
      memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1182
  {
1183
      /* The scroll the cursor towards the other end, since it was the one
1184
       * extended by ME_ExtendAnchorSelection */
1185
      ME_EnsureVisible(editor, &editor->pCursors[1]);
1186
  } else {
1187
      ME_EnsureVisible(editor, &editor->pCursors[0]);
1188 1189
  }

1190
  ME_InvalidateSelection(editor);
1191
  ITextHost_TxShowCaret(editor->texthost, FALSE);
1192
  ME_ShowCaret(editor);
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
  ME_SendSelChange(editor);
}

static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow, 
                                int x, int *pOffset, int *pbCaretAtEnd)
{
  ME_DisplayItem *pNext, *pLastRun;
  pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
  assert(pNext->type == diRun);
  pLastRun = pNext;
1203 1204
  if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
  if (pOffset) *pOffset = 0;
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
  do {
    int run_x = pNext->member.run.pt.x;
    int width = pNext->member.run.nWidth;
    if (x < run_x)
    {
      return pNext;
    }
    if (x >= run_x && x < run_x+width)
    {
      int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
      ME_String *s = pNext->member.run.strText;
      if (ch < s->nLen) {
        if (pOffset)
          *pOffset = ch;
        return pNext;          
      }
    }
    pLastRun = pNext;
    pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
  } while(pNext && pNext->type == diRun);
  
  if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
  {
    pNext = ME_FindItemFwd(pNext, diRun);
1229
    if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
    return pNext;
  } else {
    return pLastRun;
  }
}

static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
{
  ME_DisplayItem *pRun = pCursor->pRun;
  int x;

  if (editor->nUDArrowX != -1)
    x = editor->nUDArrowX;
  else {
    if (editor->bCaretAtEnd)
    {
      pRun = ME_FindItemBack(pRun, diRun);
      assert(pRun);
      x = pRun->member.run.pt.x + pRun->member.run.nWidth;
    }
    else {
      x = pRun->member.run.pt.x;
      x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
    }
    editor->nUDArrowX = x;
  }
  return x;
}

1259 1260 1261

static void
ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1262 1263
{
  ME_DisplayItem *pRun = pCursor->pRun;
1264 1265
  ME_DisplayItem *pOldPara = pCursor->pPara;
  ME_DisplayItem *pItem, *pNewPara;
1266
  int x = ME_GetXForArrow(editor, pCursor);
1267

1268
  if (editor->bCaretAtEnd && !pCursor->nOffset)
1269 1270 1271
    if (!ME_PrevRun(&pOldPara, &pRun))
      return;

1272
  if (nRelOfs == -1)
1273
  {
1274 1275 1276 1277 1278
    /* start of this row */
    pItem = ME_FindItemBack(pRun, diStartRow);
    assert(pItem);
    /* start of the previous row */
    pItem = ME_FindItemBack(pItem, diStartRow);
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
    if (!pItem)
      return; /* row not found - ignore */
    pNewPara = ME_GetParagraph(pItem);
    if (pOldPara->member.para.nFlags & MEPF_ROWEND ||
        (pOldPara->member.para.pCell &&
         pOldPara->member.para.pCell != pNewPara->member.para.pCell))
    {
      /* Brought out of a cell */
      pNewPara = ME_GetTableRowStart(pOldPara)->member.para.prev_para;
      if (pNewPara->type == diTextStart)
        return; /* At the top, so don't go anywhere. */
      pItem = ME_FindItemFwd(pNewPara, diStartRow);
    }
    if (pNewPara->member.para.nFlags & MEPF_ROWEND)
    {
      /* Brought into a table row */
      ME_Cell *cell = &ME_FindItemBack(pNewPara, diCell)->member.cell;
      while (x < cell->pt.x && cell->prev_cell)
        cell = &cell->prev_cell->member.cell;
      if (cell->next_cell) /* else - we are still at the end of the row */
        pItem = ME_FindItemBack(cell->next_cell, diStartRow);
    }
1301 1302 1303 1304 1305
  }
  else
  {
    /* start of the next row */
    pItem = ME_FindItemFwd(pRun, diStartRow);
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
    if (!pItem)
      return; /* row not found - ignore */
    pNewPara = ME_GetParagraph(pItem);
    if (pOldPara->member.para.nFlags & MEPF_ROWSTART ||
        (pOldPara->member.para.pCell &&
         pOldPara->member.para.pCell != pNewPara->member.para.pCell))
    {
      /* Brought out of a cell */
      pNewPara = ME_GetTableRowEnd(pOldPara)->member.para.next_para;
      if (pNewPara->type == diTextEnd)
        return; /* At the bottom, so don't go anywhere. */
      pItem = ME_FindItemFwd(pNewPara, diStartRow);
    }
    if (pNewPara->member.para.nFlags & MEPF_ROWSTART)
    {
      /* Brought into a table row */
      ME_DisplayItem *cell = ME_FindItemFwd(pNewPara, diCell);
      while (cell->member.cell.next_cell &&
             x >= cell->member.cell.next_cell->member.cell.pt.x)
        cell = cell->member.cell.next_cell;
      pItem = ME_FindItemFwd(cell, diStartRow);
    }
1328 1329 1330
  }
  if (!pItem)
  {
1331
    /* row not found - ignore */
1332 1333 1334
    return;
  }
  pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1335
  pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1336 1337 1338 1339
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1340
static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1341
{
1342
  ME_DisplayItem *p = ME_FindItemFwd(editor->pBuffer->pFirst, diStartRow);
1343

1344
  if (editor->vert_si.nPos < p->member.row.nHeight)
1345
  {
1346
    ME_SetCursorToStart(editor, pCursor);
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
    editor->bCaretAtEnd = FALSE;
    /* Native clears seems to clear this x value on page up at the top
     * of the text, but not on page down at the end of the text.
     * Doesn't make sense, but we try to be bug for bug compatible. */
    editor->nUDArrowX = -1;
  } else {
    ME_DisplayItem *pRun = pCursor->pRun;
    ME_DisplayItem *pLast;
    int x, y, ys, yd, yp, yprev;
    int yOldScrollPos = editor->vert_si.nPos;
1357

1358 1359 1360
    x = ME_GetXForArrow(editor, pCursor);
    if (!pCursor->nOffset && editor->bCaretAtEnd)
      pRun = ME_FindItemBack(pRun, diRun);
1361

1362 1363 1364 1365
    p = ME_FindItemBack(pRun, diStartRowOrParagraph);
    assert(p->type == diStartRow);
    yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
    yprev = ys = y = yp + p->member.row.pt.y;
1366

1367 1368 1369 1370
    ME_ScrollUp(editor, editor->sizeWindow.cy);
    /* Only move the cursor by the amount scrolled. */
    yd = y + editor->vert_si.nPos - yOldScrollPos;
    pLast = p;
1371

1372 1373 1374
    do {
      p = ME_FindItemBack(p, diStartRowOrParagraph);
      if (!p)
1375
        break;
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
      if (p->type == diParagraph) { /* crossing paragraphs */
        if (p->member.para.prev_para == NULL)
          break;
        yp = p->member.para.prev_para->member.para.pt.y;
        continue;
      }
      y = yp + p->member.row.pt.y;
      if (y < yd)
        break;
      pLast = p;
      yprev = y;
    } while(1);
1388

1389 1390
    pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
                                    &editor->bCaretAtEnd);
1391
    pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1392 1393 1394 1395 1396
  }
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1397
static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1398
{
1399 1400 1401 1402 1403 1404 1405
  ME_DisplayItem *pLast;
  int x, y;

  /* Find y position of the last row */
  pLast = editor->pBuffer->pLast;
  y = pLast->member.para.prev_para->member.para.pt.y
      + ME_FindItemBack(pLast, diStartRow)->member.row.pt.y;
1406

1407
  x = ME_GetXForArrow(editor, pCursor);
1408

1409 1410
  if (editor->vert_si.nPos >= y - editor->sizeWindow.cy)
  {
1411
    ME_SetCursorToEnd(editor, pCursor);
1412 1413 1414 1415 1416 1417
    editor->bCaretAtEnd = FALSE;
  } else {
    ME_DisplayItem *pRun = pCursor->pRun;
    ME_DisplayItem *p;
    int ys, yd, yp, yprev;
    int yOldScrollPos = editor->vert_si.nPos;
1418

1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432
    if (!pCursor->nOffset && editor->bCaretAtEnd)
      pRun = ME_FindItemBack(pRun, diRun);

    p = ME_FindItemBack(pRun, diStartRowOrParagraph);
    assert(p->type == diStartRow);
    yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
    yprev = ys = y = yp + p->member.row.pt.y;

    /* For native richedit controls:
     * v1.0 - v3.1 can only scroll down as far as the scrollbar lets us
     * v4.1 can scroll past this position here. */
    ME_ScrollDown(editor, editor->sizeWindow.cy);
    /* Only move the cursor by the amount scrolled. */
    yd = y + editor->vert_si.nPos - yOldScrollPos;
1433
    pLast = p;
1434

1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
    do {
      p = ME_FindItemFwd(p, diStartRowOrParagraph);
      if (!p)
        break;
      if (p->type == diParagraph) {
        yp = p->member.para.pt.y;
        continue;
      }
      y = yp + p->member.row.pt.y;
      if (y >= yd)
        break;
      pLast = p;
      yprev = y;
    } while(1);

    pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
                                    &editor->bCaretAtEnd);
1452
    pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1453 1454 1455 1456 1457
  }
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1458
static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
{
  ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
  if (pRow) {
    ME_DisplayItem *pRun;
    if (editor->bCaretAtEnd && !pCursor->nOffset) {
      pRow = ME_FindItemBack(pRow, diStartRow);
      if (!pRow)
        return;
    }
    pRun = ME_FindItemFwd(pRow, diRun);
    if (pRun) {
      pCursor->pRun = pRun;
1471
      assert(pCursor->pPara == ME_GetParagraph(pRun));
1472 1473 1474 1475 1476 1477
      pCursor->nOffset = 0;
    }
  }
  editor->bCaretAtEnd = FALSE;
}

1478
static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1479
{
1480
  ME_SetCursorToStart(editor, pCursor);
1481
  editor->bCaretAtEnd = FALSE;
1482 1483
}

1484
static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1485 1486
{
  ME_DisplayItem *pRow;
1487

1488 1489
  if (editor->bCaretAtEnd && !pCursor->nOffset)
    return;
1490

1491 1492 1493 1494 1495 1496
  pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
  assert(pRow);
  if (pRow->type == diStartRow) {
    ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
    assert(pRun);
    pCursor->pRun = pRun;
1497
    assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1498
    pCursor->nOffset = 0;
1499
    editor->bCaretAtEnd = TRUE;
1500 1501 1502 1503
    return;
  }
  pCursor->pRun = ME_FindItemBack(pRow, diRun);
  assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1504
  assert(pCursor->pPara == ME_GetParagraph(pCursor->pRun));
1505 1506 1507
  pCursor->nOffset = 0;
  editor->bCaretAtEnd = FALSE;
}
1508

1509
static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1510
{
1511
  ME_SetCursorToEnd(editor, pCursor);
1512 1513 1514 1515 1516
  editor->bCaretAtEnd = FALSE;
}

BOOL ME_IsSelection(ME_TextEditor *editor)
{
1517 1518
  return editor->pCursors[0].pRun != editor->pCursors[1].pRun ||
         editor->pCursors[0].nOffset != editor->pCursors[1].nOffset;
1519 1520 1521 1522 1523
}

void ME_DeleteSelection(ME_TextEditor *editor)
{
  int from, to;
1524 1525
  int nStartCursor = ME_GetSelectionOfs(editor, &from, &to);
  ME_DeleteTextAtCursor(editor, nStartCursor, to - from);
1526 1527
}

1528 1529
ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
{
1530
  return ME_GetInsertStyle(editor, 0);
1531 1532
}

1533 1534 1535
void ME_SendSelChange(ME_TextEditor *editor)
{
  SELCHANGE sc;
1536

1537 1538
  if (!(editor->nEventMask & ENM_SELCHANGE))
    return;
1539

1540 1541
  sc.nmhdr.hwndFrom = NULL;
  sc.nmhdr.idFrom = 0;
1542
  sc.nmhdr.code = EN_SELCHANGE;
1543
  ME_GetSelectionOfs(editor, &sc.chrg.cpMin, &sc.chrg.cpMax);
1544 1545 1546
  sc.seltyp = SEL_EMPTY;
  if (sc.chrg.cpMin != sc.chrg.cpMax)
    sc.seltyp |= SEL_TEXT;
1547
  if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* what were RICHEDIT authors thinking ? */
1548
    sc.seltyp |= SEL_MULTICHAR;
1549 1550 1551 1552 1553 1554
  TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
    sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
    (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
    (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
  if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
  {
1555 1556
    ME_ClearTempStyle(editor);

1557
    editor->notified_cr = sc.chrg;
1558
    ITextHost_TxNotify(editor->texthost, sc.nmhdr.code, &sc);
1559
  }
1560 1561
}

1562
BOOL
1563
ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1564 1565 1566 1567
{
  int nCursor = 0;
  ME_Cursor *p = &editor->pCursors[nCursor];
  ME_Cursor tmp_curs = *p;
1568
  BOOL success = FALSE;
1569

1570
  ME_CheckCharOffsets(editor);
1571
  switch(nVKey) {
1572 1573
    case VK_LEFT:
      editor->bCaretAtEnd = 0;
1574 1575 1576 1577
      if (ctrl)
        success = ME_MoveCursorWords(editor, &tmp_curs, -1);
      else
        success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1578 1579 1580
      break;
    case VK_RIGHT:
      editor->bCaretAtEnd = 0;
1581 1582 1583 1584
      if (ctrl)
        success = ME_MoveCursorWords(editor, &tmp_curs, +1);
      else
        success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1585
      break;
1586
    case VK_UP:
1587 1588
      ME_MoveCursorLines(editor, &tmp_curs, -1);
      break;
1589
    case VK_DOWN:
1590 1591
      ME_MoveCursorLines(editor, &tmp_curs, +1);
      break;
1592
    case VK_PRIOR:
1593 1594
      ME_ArrowPageUp(editor, &tmp_curs);
      break;
1595
    case VK_NEXT:
1596 1597
      ME_ArrowPageDown(editor, &tmp_curs);
      break;
1598
    case VK_HOME: {
1599
      if (ctrl)
1600
        ME_ArrowCtrlHome(editor, &tmp_curs);
1601
      else
1602
        ME_ArrowHome(editor, &tmp_curs);
1603
      editor->bCaretAtEnd = 0;
1604
      break;
1605
    }
1606
    case VK_END:
1607
      if (ctrl)
1608
        ME_ArrowCtrlEnd(editor, &tmp_curs);
1609
      else
1610 1611
        ME_ArrowEnd(editor, &tmp_curs);
      break;
1612
  }
1613

1614 1615 1616
  if (!extend)
    editor->pCursors[1] = tmp_curs;
  *p = tmp_curs;
1617

1618 1619
  ME_InvalidateSelection(editor);
  ME_Repaint(editor);
1620
  ITextHost_TxShowCaret(editor->texthost, FALSE);
1621
  ME_EnsureVisible(editor, &tmp_curs);
1622 1623 1624
  ME_ShowCaret(editor);
  ME_SendSelChange(editor);
  return success;
1625
}