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 ||
      (how->flags & GTL_PRECISE &&     /* GTL_PRECISE seems to imply GTL_NUMBYTES */
       !(how->flags & GTL_NUMCHARS)))  /* unless GTL_NUMCHARS is given */
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  {
    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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      if (start != end)
      {
          editor->pCursors[1] = editor->pCursors[0];
          ME_Repaint(editor);
      }
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      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);
  WCHAR                 space = ' ';

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

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  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];
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        if (p->nOffset)
          ME_SplitRunSimple(editor, p);
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        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;
    }
631

632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656
    /* 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;
657
    }
658 659 660 661 662 663 664 665 666 667

    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 */
668
    do {
669 670 671 672 673 674 675
      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)
676
    {
677 678
      cursor->nOffset -= cursor->pRun->member.run.strText->nLen;
      cursor->pRun = ME_FindItemFwd(cursor->pRun, diRun);
679
    }
680 681
  } /* else new offset is in the same run */
  return nRelOfs;
682 683
}

684

685 686 687 688
static BOOL
ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
{
  ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
689
  ME_DisplayItem *pPara = cursor->pPara;
690
  int nOffset = cursor->nOffset;
691

692 693 694 695 696 697 698
  if (nRelOfs == -1)
  {
    /* Backward movement */
    while (TRUE)
    {
      nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
                                     nOffset, WB_MOVEWORDLEFT);
699
      if (nOffset)
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
        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)
        {
719
          pPara = pOtherRun;
720
          /* Skip empty start of table row paragraph */
721 722
          if (pPara->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
            pPara = pPara->member.para.prev_para;
723
          /* Paragraph breaks are treated as separate words */
724
          if (pPara->member.para.prev_para->type == diTextStart)
725
            return FALSE;
726

727
          pRun = ME_FindItemBack(pPara, diRun);
728
          pPara = pPara->member.para.prev_para;
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
        }
        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)
      {
758 759
        if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
            pOtherRun = pOtherRun->member.para.next_para;
760 761 762 763
        if (cursor->pRun == pRun) {
          pPara = pOtherRun;
          pRun = ME_FindItemFwd(pPara, diRun);
        }
764 765 766 767 768 769 770 771 772 773 774 775
        nOffset = 0;
        break;
      }
      else /* diTextEnd */
      {
        if (cursor->pRun == pRun)
          return FALSE;
        nOffset = 0;
        break;
      }
    }
  }
776
  cursor->pPara = pPara;
777 778 779 780
  cursor->pRun = pRun;
  cursor->nOffset = nOffset;
  return TRUE;
}
781

782

783
static void
784
ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
785
{
786 787
  /* pCursor[0] is the end of the selection
   * pCursor[1] is the start of the selection (or the position selection anchor)
788 789 790 791 792 793 794 795 796 797
   * 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:
798 799 800
      ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
      editor->pCursors[1] = editor->pCursors[0];
      ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816
      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)
817
          editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
818
      else
819
          editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
820
      editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
821 822 823 824
      editor->pCursors[0].nOffset = 0;

      pItem = ME_FindItemBack(pItem, backSearchType);
      editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
825
      editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
826 827 828
      editor->pCursors[1].nOffset = 0;
      break;
    }
829 830 831
    case stDocument:
      /* Select everything with cursor anchored from the start of the text */
      editor->nSelectionType = stDocument;
832 833
      ME_SetCursorToStart(editor, &editor->pCursors[1]);
      ME_SetCursorToEnd(editor, &editor->pCursors[0]);
834
      break;
835 836 837 838 839
    default: assert(0);
  }
  /* Store the anchor positions for extending the selection. */
  editor->pCursors[2] = editor->pCursors[0];
  editor->pCursors[3] = editor->pCursors[1];
840 841
}

842
int ME_GetCursorOfs(const ME_Cursor *cursor)
843
{
844 845
  return cursor->pPara->member.para.nCharOfs
         + cursor->pRun->member.run.nCharOfs + cursor->nOffset;
846 847
}

848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
/* 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;
}

887 888 889 890 891 892 893 894 895
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);
896
  if (result->nOffset == found->member.run.strText->nLen && rx)
897
  {
898
    result->pRun = ME_FindItemFwd(result->pRun, diRun);
899 900
    result->nOffset = 0;
  }
901
  result->pPara = ME_GetParagraph(result->pRun);
902 903 904
  return isExact;
}

905 906 907 908 909 910 911 912 913 914
/* 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)
915 916
{
  ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
917
  ME_DisplayItem *last = NULL;
918
  int rx = 0;
919
  BOOL isExact = TRUE;
920

921 922 923
  x -= editor->rcFormat.left;
  y -= editor->rcFormat.top;

924 925 926
  if (is_eol)
    *is_eol = 0;

927 928
  /* find paragraph */
  for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
929
  {
930
    assert(p->type == diParagraph);
931
    if (y < p->member.para.pt.y + p->member.para.nHeight)
932
    {
933 934 935
      if (p->member.para.nFlags & MEPF_ROWSTART)
        p = ME_FindPixelPosInTableRow(x, y, p);
      y -= p->member.para.pt.y;
936
      p = ME_FindItemFwd(p, diStartRow);
937
      break;
938 939
    } else if (p->member.para.nFlags & MEPF_ROWSTART) {
      p = ME_GetTableRowEnd(p);
940
    }
941 942 943 944 945 946
  }
  /* find row */
  for (; p != editor->pBuffer->pLast; )
  {
    ME_DisplayItem *pp;
    assert(p->type == diStartRow);
947
    if (y < p->member.row.pt.y + p->member.row.nHeight)
948
    {
949 950 951 952 953 954 955 956
        p = ME_FindItemFwd(p, diRun);
        break;
    }
    pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
    if (pp->type != diStartRow)
    {
        p = ME_FindItemFwd(p, diRun);
        break;
957
    }
958 959
    p = pp;
  }
960 961 962 963 964
  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. */
965
    isExact = FALSE;
966 967 968 969 970 971 972 973 974
    p = ME_FindItemBack(p, diStartRow);
    if (p != NULL){
      p = ME_FindItemFwd(p, diRun);
    }
    else
    {
      p = editor->pBuffer->pLast;
    }
  }
975 976 977
  for (; p != editor->pBuffer->pLast; p = p->next)
  {
    switch (p->type)
978
    {
979
    case diRun:
980
      rx = x - p->member.run.pt.x;
981
      if (rx < p->member.run.nWidth)
982
        return ME_ReturnFoundPos(editor, p, result, rx, isExact);
983 984
      break;
    case diStartRow:
985
      isExact = FALSE;
986 987 988
      p = ME_FindItemFwd(p, diRun);
      if (is_eol) *is_eol = 1;
      rx = 0; /* FIXME not sure */
989
      return ME_ReturnFoundPos(editor, p, result, rx, isExact);
990
    case diCell:
991 992
    case diParagraph:
    case diTextEnd:
993
      isExact = FALSE;
994 995
      rx = 0; /* FIXME not sure */
      p = last;
996
      return ME_ReturnFoundPos(editor, p, result, rx, isExact);
997
    default: assert(0);
998
    }
999
    last = p;
1000 1001
  }
  result->pRun = ME_FindItemBack(p, diRun);
1002
  result->pPara = ME_GetParagraph(result->pRun);
1003 1004
  result->nOffset = 0;
  assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
1005
  return FALSE;
1006 1007
}

1008

1009
/* Sets the cursor to the position closest to the pixel position
1010 1011 1012 1013 1014
 *
 * 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.
1015 1016 1017
 *
 * return FALSE if outside client area and the cursor is not set,
 * otherwise TRUE is returned.
1018
 */
1019 1020
BOOL ME_CharFromPos(ME_TextEditor *editor, int x, int y,
                    ME_Cursor *cursor, BOOL *isExact)
1021 1022
{
  RECT rc;
1023
  BOOL bResult;
1024

1025
  ITextHost_TxGetClientRect(editor->texthost, &rc);
1026 1027
  if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
    if (isExact) *isExact = FALSE;
1028
    return FALSE;
1029
  }
1030 1031
  x += editor->horz_si.nPos;
  y += editor->vert_si.nPos;
1032
  bResult = ME_FindPixelPos(editor, x, y, cursor, NULL);
1033
  if (isExact) *isExact = bResult;
1034
  return TRUE;
1035 1036
}

1037 1038


1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
/* 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;
1053
  if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
1054
      return;
1055 1056 1057
  curOfs = ME_GetCursorOfs(&editor->pCursors[0]);
  anchorStartOfs = ME_GetCursorOfs(&editor->pCursors[3]);
  anchorEndOfs = ME_GetCursorOfs(&editor->pCursors[2]);
1058 1059 1060 1061 1062 1063 1064

  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 */
1065
      editor->pCursors[1] = tmp_cursor;
1066
      if (editor->nSelectionType == stWord)
1067
          ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
1068 1069 1070
      else
      {
          ME_DisplayItem *pItem;
1071 1072
          ME_DIType searchType = ((editor->nSelectionType == stLine) ?
                                  diStartRowOrParagraph:diParagraph);
1073 1074
          pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
          editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
1075
          editor->pCursors[1].pPara = ME_GetParagraph(editor->pCursors[1].pRun);
1076
          editor->pCursors[1].nOffset = 0;
1077 1078 1079 1080 1081
      }
  }
  else if (curOfs >= anchorEndOfs)
  {
      /* Extend the right side of selection */
1082
      editor->pCursors[0] = tmp_cursor;
1083
      if (editor->nSelectionType == stWord)
1084
          ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
1085 1086 1087
      else
      {
          ME_DisplayItem *pItem;
1088 1089
          ME_DIType searchType = ((editor->nSelectionType == stLine) ?
                                  diStartRowOrParagraphOrEnd:diParagraphOrEnd);
1090
          pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
1091
          if (pItem->type == diTextEnd)
1092
              editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
1093
          else
1094
              editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
1095
          editor->pCursors[0].pPara = ME_GetParagraph(editor->pCursors[0].pRun);
1096
          editor->pCursors[0].nOffset = 0;
1097 1098 1099
      }
  }
}
1100

1101
void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1102 1103 1104
{
  ME_Cursor tmp_cursor;
  int is_selection = 0;
1105
  BOOL is_shift;
1106

1107
  editor->nUDArrowX = -1;
1108 1109 1110

  x += editor->horz_si.nPos;
  y += editor->vert_si.nPos;
1111 1112 1113

  tmp_cursor = editor->pCursors[0];
  is_selection = ME_IsSelection(editor);
1114
  is_shift = GetKeyState(VK_SHIFT) < 0;
1115

1116 1117
  ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);

1118
  if (x >= editor->rcFormat.left || is_shift)
1119
  {
1120 1121 1122
    if (clickNum > 1)
    {
      editor->pCursors[1] = editor->pCursors[0];
1123
      if (is_shift) {
1124
          if (x >= editor->rcFormat.left)
1125 1126 1127 1128
              ME_SelectByType(editor, stWord);
          else
              ME_SelectByType(editor, stParagraph);
      } else if (clickNum % 2 == 0) {
1129
          ME_SelectByType(editor, stWord);
1130
      } else {
1131
          ME_SelectByType(editor, stParagraph);
1132
      }
1133
    }
1134
    else if (!is_shift)
1135
    {
1136
      editor->nSelectionType = stPosition;
1137 1138
      editor->pCursors[1] = editor->pCursors[0];
    }
1139 1140 1141
    else if (!is_selection)
    {
      editor->nSelectionType = stPosition;
1142
      editor->pCursors[1] = tmp_cursor;
1143 1144 1145 1146
    }
    else if (editor->nSelectionType != stPosition)
    {
      ME_ExtendAnchorSelection(editor);
1147
    }
1148 1149 1150
  }
  else
  {
1151 1152
    if (clickNum < 2) {
        ME_SelectByType(editor, stLine);
1153
    } else if (clickNum % 2 == 0 || is_shift) {
1154
        ME_SelectByType(editor, stParagraph);
1155 1156
    } else {
        ME_SelectByType(editor, stDocument);
1157
    }
1158
  }
1159
  ME_InvalidateSelection(editor);
1160
  ITextHost_TxShowCaret(editor->texthost, FALSE);
1161
  ME_ShowCaret(editor);
1162 1163
  ME_ClearTempStyle(editor);
  ME_SendSelChange(editor);
1164 1165 1166 1167 1168
}

void ME_MouseMove(ME_TextEditor *editor, int x, int y)
{
  ME_Cursor tmp_cursor;
1169

1170 1171
  if (editor->nSelectionType == stDocument)
      return;
1172 1173
  x += editor->horz_si.nPos;
  y += editor->vert_si.nPos;
1174 1175

  tmp_cursor = editor->pCursors[0];
1176
  /* FIXME: do something with the return value of ME_FindPixelPos */
1177
  ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1178

1179
  ME_InvalidateSelection(editor);
1180 1181 1182 1183 1184
  editor->pCursors[0] = tmp_cursor;
  ME_ExtendAnchorSelection(editor);

  if (editor->nSelectionType != stPosition &&
      memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1185
  {
1186
      /* The scroll the cursor towards the other end, since it was the one
1187
       * extended by ME_ExtendAnchorSelection */
1188
      ME_EnsureVisible(editor, &editor->pCursors[1]);
1189
  } else {
1190
      ME_EnsureVisible(editor, &editor->pCursors[0]);
1191 1192
  }

1193
  ME_InvalidateSelection(editor);
1194
  ITextHost_TxShowCaret(editor->texthost, FALSE);
1195
  ME_ShowCaret(editor);
1196 1197 1198 1199 1200 1201 1202 1203 1204
  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);
1205 1206
  if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
  if (pOffset) *pOffset = 0;
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230
  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);
1231
    if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
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 1259 1260
    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;
}

1261 1262 1263

static void
ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1264 1265
{
  ME_DisplayItem *pRun = pCursor->pRun;
1266 1267
  ME_DisplayItem *pOldPara = pCursor->pPara;
  ME_DisplayItem *pItem, *pNewPara;
1268
  int x = ME_GetXForArrow(editor, pCursor);
1269

1270
  if (editor->bCaretAtEnd && !pCursor->nOffset)
1271 1272 1273
    if (!ME_PrevRun(&pOldPara, &pRun))
      return;

1274
  if (nRelOfs == -1)
1275
  {
1276 1277 1278 1279 1280
    /* start of this row */
    pItem = ME_FindItemBack(pRun, diStartRow);
    assert(pItem);
    /* start of the previous row */
    pItem = ME_FindItemBack(pItem, diStartRow);
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
    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);
    }
1303 1304 1305 1306 1307
  }
  else
  {
    /* start of the next row */
    pItem = ME_FindItemFwd(pRun, diStartRow);
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
    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);
    }
1330 1331 1332
  }
  if (!pItem)
  {
1333
    /* row not found - ignore */
1334 1335 1336
    return;
  }
  pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1337
  pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1338 1339 1340 1341
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1342
static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1343
{
1344
  ME_DisplayItem *p = ME_FindItemFwd(editor->pBuffer->pFirst, diStartRow);
1345

1346
  if (editor->vert_si.nPos < p->member.row.nHeight)
1347
  {
1348
    ME_SetCursorToStart(editor, pCursor);
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;
1357
    int x, y, yd, yp;
1358
    int yOldScrollPos = editor->vert_si.nPos;
1359

1360 1361 1362
    x = ME_GetXForArrow(editor, pCursor);
    if (!pCursor->nOffset && editor->bCaretAtEnd)
      pRun = ME_FindItemBack(pRun, diRun);
1363

1364 1365 1366
    p = ME_FindItemBack(pRun, diStartRowOrParagraph);
    assert(p->type == diStartRow);
    yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
1367
    y = yp + p->member.row.pt.y;
1368

1369 1370 1371 1372
    ME_ScrollUp(editor, editor->sizeWindow.cy);
    /* Only move the cursor by the amount scrolled. */
    yd = y + editor->vert_si.nPos - yOldScrollPos;
    pLast = p;
1373

1374 1375 1376
    do {
      p = ME_FindItemBack(p, diStartRowOrParagraph);
      if (!p)
1377
        break;
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388
      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;
    } while(1);
1389

1390 1391
    pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset,
                                    &editor->bCaretAtEnd);
1392
    pCursor->pPara = ME_GetParagraph(pCursor->pRun);
1393 1394 1395 1396 1397
  }
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1398
static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1399
{
1400 1401 1402 1403 1404 1405 1406
  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;
1407

1408
  x = ME_GetXForArrow(editor, pCursor);
1409

1410 1411
  if (editor->vert_si.nPos >= y - editor->sizeWindow.cy)
  {
1412
    ME_SetCursorToEnd(editor, pCursor);
1413 1414 1415 1416
    editor->bCaretAtEnd = FALSE;
  } else {
    ME_DisplayItem *pRun = pCursor->pRun;
    ME_DisplayItem *p;
1417
    int yd, yp;
1418
    int yOldScrollPos = editor->vert_si.nPos;
1419

1420 1421 1422 1423 1424 1425
    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;
1426
    y = yp + p->member.row.pt.y;
1427 1428 1429 1430 1431 1432 1433

    /* 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;
1434
    pLast = p;
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;
    } 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
}