caret.c 48.7 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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static BOOL
ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs);

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void ME_GetSelection(ME_TextEditor *editor, int *from, int *to)
{
  *from = ME_GetCursorOfs(editor, 0);
  *to =   ME_GetCursorOfs(editor, 1);
  
  if (*from > *to)
  {
    int tmp = *from;
    *from = *to;
    *to = tmp;    
  }
}

int ME_GetTextLength(ME_TextEditor *editor)
{
  return ME_CharOfsFromRunOfs(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun), 0);   
}

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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 ((GetWindowLongW(editor->hWnd, GWL_STYLE) & ES_MULTILINE)
        && (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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    editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
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    editor->pCursors[1].nOffset = 0; 
    editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun); 
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    editor->pCursors[0].nOffset = 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;
      ME_GetSelection(editor, &start, &end);
      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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    editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
    editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
    ME_InvalidateSelection(editor);
    ME_ClearTempStyle(editor);
    return len;
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  }
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  ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
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  ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
  return to;
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}


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void
ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
                        int *x, int *y, int *height)
{
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  ME_DisplayItem *pCursorRun = pCursor->pRun;
  ME_DisplayItem *pSizeRun = pCursor->pRun;
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  assert(height && x && y);
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  assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
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  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
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  if (pCursorRun->type == diRun) {
    ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
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    if (row) {
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      HDC hDC = GetDC(editor->hWnd);
      ME_Context c;
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      ME_DisplayItem *run = pCursorRun;
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      ME_DisplayItem *para = NULL;
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      SIZE sz = {0, 0};
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      ME_InitContext(&c, editor, hDC);
      
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      if (!pCursor->nOffset)
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      {
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        ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrParagraph);
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        assert(prev);
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        if (prev->type == diRun)
          pSizeRun = prev;
      }
      assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
      para = ME_FindItemBack(row, diParagraph);
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      assert(para);
      assert(para->type == diParagraph);
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      if (editor->bCaretAtEnd && !pCursor->nOffset && 
          run == ME_FindItemFwd(row, diRun))
      {
        ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
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        assert(tmp);
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        if (tmp->type == diRun)
        {
          row = ME_FindItemBack(tmp, diStartRow);
          pSizeRun = run = tmp;
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          assert(run);
          assert(run->type == diRun);
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          sz = ME_GetRunSize(&c, &para->member.para,
                             &run->member.run, ME_StrLen(run->member.run.strText),
                             row->member.row.nLMargin);
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        }
      }
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      if (pCursor->nOffset) {
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        sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset,
                           row->member.row.nLMargin);
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      }
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      *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
      *x = run->member.run.pt.x + sz.cx;
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      *y = para->member.para.pt.y + row->member.row.nBaseline + run->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
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      ME_DestroyContext(&c, editor->hWnd);
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      return;
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    }
  }
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  *height = 10; /* FIXME use global font */
  *x = 0;
  *y = 0;
}


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

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  if (ME_WrapMarkedParagraphs(editor))
    ME_UpdateScrollBar(editor);
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  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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    RECT rect;

    GetClientRect(editor->hWnd, &rect);
    x = min(x, rect.right-2);
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    CreateCaret(editor->hWnd, NULL, 0, height);
    SetCaretPos(x, y);
  }
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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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    ShowCaret(ed->hWnd);
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}

void ME_HideCaret(ME_TextEditor *ed)
{
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  if(!ed->bHaveFocus || ME_IsSelection(ed))
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  {
    HideCaret(ed->hWnd);
    DestroyCaret();
  }
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}

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

  {
    /* Prevent deletion past last end of paragraph run. */
    ME_DisplayItem *pTextEnd = editor->pBuffer->pLast;
    int nMaxChars = pTextEnd->member.para.prev_para->member.para.nCharOfs;
    nMaxChars += ME_FindItemBack(pTextEnd, diRun)->member.run.nCharOfs;
    nMaxChars -= nOfs;
    nChars = min(nChars, nMaxChars);
  }

  ME_CursorFromCharOfs(editor, nOfs, &c);
  start_para = ME_GetParagraph(c.pRun);
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  if (!bForce)
  {
    ME_ProtectPartialTableDeletion(editor, nOfs, &nChars);
    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
                        + ME_GetParagraph(c.pRun)->member.para.nCharOfs))
    {
      /* We aren't deleting anything in this run, so we will go back to the
       * last run we are deleting text in. */
      c.pRun = ME_FindItemBack(c.pRun, diRun);
      if (c.pRun->member.run.nFlags & MERF_ENDPARA)
        c.nOffset = c.pRun->member.run.nCR + c.pRun->member.run.nLF;
      else
        c.nOffset = c.pRun->member.run.strText->nLen;
    }
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    run = &c.pRun->member.run;
    if (run->nFlags & MERF_ENDPARA) {
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      int eollen = run->nCR + run->nLF;
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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, ME_GetParagraph(c.pRun), 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);

      if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
      {
        /* 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);
      
      /* update cursors (including c) */
      for (i=-1; i<editor->nCursors; i++) {
        ME_Cursor *pThisCur = editor->pCursors + i; 
        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);
            assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
          }
          if (pThisCur->nOffset == ME_StrVLen(run->strText))
          {
            pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
            assert(pThisCur->pRun->type == diRun);
            pThisCur->nOffset = 0;
          }
        }
      }
      
      /* c = updated data now */
      
      if (c.pRun == cursor.pRun)
        ME_SkipAndPropagateCharOffset(c.pRun, shift);
      else
        ME_PropagateCharOffset(c.pRun, shift);

      if (!ME_StrVLen(cursor.pRun->member.run.strText))
      {
        TRACE("Removing useless run\n");
        ME_Remove(cursor.pRun);
        ME_DestroyDisplayItem(cursor.pRun);
      }
      
      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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{  
  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, ME_GetCursorOfs(editor, nCursor), 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_SendSelChange(editor);
}


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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);
  ME_SendSelChange(editor);
}

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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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  while (len)
  {
    pos = str;
    /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
    while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
      pos++;
    if (pos-str < len && *pos == '\t') { /* handle tabs */
      WCHAR tab = '\t';
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      if (pos!=str)
        ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
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      ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 
      pos++;
      if(pos-str <= len) {
        len -= pos - str;
        str = pos;
        continue;
      }
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    }
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    /* handle special \r\r\n sequence (richedit 2.x and higher only) */
    if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
      WCHAR space = ' ';

      if (pos!=str)
        ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);

      ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);

      pos+=3;
      if(pos-str <= len) {
        len -= pos - str;
        str = pos;
        continue;
      }
    }
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    if (pos-str < len) {   /* handle EOLs */
      ME_DisplayItem *tp, *end_run;
      ME_Style *tmp_style;
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      int numCR, numLF;

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      if (pos!=str)
        ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
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      p = &editor->pCursors[nCursor];
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      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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      /* Encode and fill number of CR and LF according to emulation mode */
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      if (editor->bEmulateVersion10) {
        const WCHAR * tpos;

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        /* We have to find out how many consecutive \r are there, and if there
           is a \n terminating the run of \r's. */
        numCR = 0; numLF = 0;
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        tpos = pos;
        while (tpos-str < len && *tpos == '\r') {
          tpos++;
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          numCR++;
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        }
        if (tpos-str >= len) {
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          /* Reached end of text without finding anything but '\r' */
          if (tpos != pos) {
            pos++;
          }
          numCR = 1; numLF = 0;
        } else if (*tpos == '\n') {
          /* The entire run of \r's plus the one \n is one single line break */
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          pos = tpos + 1;
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          numLF = 1;
        } else {
          /* Found some other content past the run of \r's */
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          pos++;
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          numCR = 1; numLF = 0;
        }
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      } else {
        if(pos-str < len && *pos =='\r')
          pos++;
        if(pos-str < len && *pos =='\n')
          pos++;
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        numCR = 1; numLF = 0;
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      }
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      tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, numCR, numLF, 0);
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      p->pRun = ME_FindItemFwd(tp, diRun);
      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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      if(pos-str <= len) {
        len -= pos - str;
        str = pos;
        continue;
      }
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    }
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    ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
    len = 0;
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  }
}

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static BOOL
ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
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{
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  ME_DisplayItem *pRun = pCursor->pRun;
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  if (nRelOfs == -1)
  {
    if (!pCursor->nOffset)
    {
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      do {
        pRun = ME_FindItemBack(pRun, diRunOrParagraph);
        assert(pRun);
        switch (pRun->type)
        {
          case diRun:
            break;
          case diParagraph:
            if (pRun->member.para.prev_para->type == diTextStart)
              return FALSE;
            pRun = ME_FindItemBack(pRun, diRunOrParagraph);
            /* every paragraph ought to have at least one run */
            assert(pRun && pRun->type == diRun);
            assert(pRun->member.run.nFlags & MERF_ENDPARA);
            break;
          default:
            assert(pRun->type != diRun && pRun->type != diParagraph);
653
            return FALSE;
654
        }
655 656
      } while (RUN_IS_HIDDEN(&pRun->member.run) ||
               pRun->member.run.nFlags & MERF_HIDDEN);
657 658 659 660 661
      pCursor->pRun = pRun;
      if (pRun->member.run.nFlags & MERF_ENDPARA)
        pCursor->nOffset = 0;
      else
        pCursor->nOffset = pRun->member.run.strText->nLen;
662 663 664 665
    }
    
    if (pCursor->nOffset)
      pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
666 667 668 669
    return TRUE;
  }
  else
  {
670
    if (!(pRun->member.run.nFlags & MERF_ENDPARA))
671
    {
672
      int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
673
    
674
      if (new_ofs < pRun->member.run.strText->nLen)
675 676
      {
        pCursor->nOffset = new_ofs;
677 678 679
        return TRUE;
      }
    }
680 681
    do {
      pRun = ME_FindItemFwd(pRun, diRun);
682 683
    } while (pRun && (RUN_IS_HIDDEN(&pRun->member.run) ||
                      pRun->member.run.nFlags & MERF_HIDDEN));
684
    if (pRun)
685
    {
686 687
      pCursor->pRun = pRun;
      pCursor->nOffset = 0;
688 689 690
      return TRUE;
    }
  }
691
  return FALSE;
692 693
}

694

695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
static BOOL
ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
{
  ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
  int nOffset = cursor->nOffset;
  
  if (nRelOfs == -1)
  {
    /* Backward movement */
    while (TRUE)
    {
      nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
                                     nOffset, WB_MOVEWORDLEFT);
       if (nOffset)
        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)
        {
728 729 730
          /* Skip empty start of table row paragraph */
          if (pOtherRun->member.para.prev_para->member.para.nFlags & MEPF_ROWSTART)
            pOtherRun = pOtherRun->member.para.prev_para;
731 732 733
          /* Paragraph breaks are treated as separate words */
          if (pOtherRun->member.para.prev_para->type == diTextStart)
            return FALSE;
734

735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764
          pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
        }
        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)
      {
765 766
        if (pOtherRun->member.para.nFlags & MEPF_ROWSTART)
            pOtherRun = pOtherRun->member.para.next_para;
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
        if (cursor->pRun == pRun)
          pRun = ME_FindItemFwd(pOtherRun, diRun);
        nOffset = 0;
        break;
      }
      else /* diTextEnd */
      {
        if (cursor->pRun == pRun)
          return FALSE;
        nOffset = 0;
        break;
      }
    }
  }
  cursor->pRun = pRun;
  cursor->nOffset = nOffset;
  return TRUE;
}
785

786

787
void
788
ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
789
{
790 791
  /* pCursor[0] is the end of the selection
   * pCursor[1] is the start of the selection (or the position selection anchor)
792 793 794 795 796 797 798 799 800 801
   * 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:
802 803 804
      ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
      editor->pCursors[1] = editor->pCursors[0];
      ME_MoveCursorWords(editor, &editor->pCursors[1], -1);
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
      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)
821
          editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
822
      else
823 824 825 826 827
          editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
      editor->pCursors[0].nOffset = 0;

      pItem = ME_FindItemBack(pItem, backSearchType);
      editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
828 829 830
      editor->pCursors[1].nOffset = 0;
      break;
    }
831 832 833 834 835 836 837 838
    case stDocument:
      /* Select everything with cursor anchored from the start of the text */
      editor->nSelectionType = stDocument;
      editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
      editor->pCursors[1].nOffset = 0;
      editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
      editor->pCursors[0].nOffset = 0;
      break;
839 840 841 842 843
    default: assert(0);
  }
  /* Store the anchor positions for extending the selection. */
  editor->pCursors[2] = editor->pCursors[0];
  editor->pCursors[3] = editor->pCursors[1];
844 845
}

846 847 848 849 850 851 852
int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
{
  ME_Cursor *pCursor = &editor->pCursors[nCursor];
  return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
    + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
}

853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
/* 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;
}

892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
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);
  if (editor->pCursors[0].nOffset == found->member.run.strText->nLen && rx)
  {
    result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
    result->nOffset = 0;
  }
  return isExact;
}

909 910 911 912 913 914 915 916 917 918
/* 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)
919 920
{
  ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
921
  ME_DisplayItem *last = NULL;
922
  int rx = 0;
923
  BOOL isExact = TRUE;
924

925 926 927
  if (is_eol)
    *is_eol = 0;

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

1008

1009 1010 1011 1012 1013 1014 1015 1016
/* Returns the character offset closest to the pixel position
 *
 * 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.
 */
int ME_CharFromPos(ME_TextEditor *editor, int x, int y, BOOL *isExact)
1017 1018 1019
{
  ME_Cursor cursor;
  RECT rc;
1020
  BOOL bResult;
1021 1022

  GetClientRect(editor->hWnd, &rc);
1023 1024
  if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom) {
    if (isExact) *isExact = FALSE;
1025
    return -1;
1026
  }
1027
  y += ME_GetYScrollPos(editor);
1028 1029
  bResult = ME_FindPixelPos(editor, x, y, &cursor, NULL);
  if (isExact) *isExact = bResult;
1030 1031 1032 1033
  return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
          + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
}

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 1052
      return;
  curOfs = ME_GetCursorOfs(editor, 0);
1053 1054
  anchorStartOfs = ME_GetCursorOfs(editor, 3);
  anchorEndOfs = ME_GetCursorOfs(editor, 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 1072
          pItem = ME_FindItemBack(editor->pCursors[1].pRun, searchType);
          editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
          editor->pCursors[1].nOffset = 0;
1073 1074 1075 1076 1077
      }
  }
  else if (curOfs >= anchorEndOfs)
  {
      /* Extend the right side of selection */
1078
      editor->pCursors[0] = tmp_cursor;
1079
      if (editor->nSelectionType == stWord)
1080
          ME_MoveCursorWords(editor, &editor->pCursors[0], +1);
1081 1082 1083
      else
      {
          ME_DisplayItem *pItem;
1084 1085
          ME_DIType searchType = ((editor->nSelectionType == stLine) ?
                                  diStartRowOrParagraphOrEnd:diParagraphOrEnd);
1086
          pItem = ME_FindItemFwd(editor->pCursors[0].pRun, searchType);
1087
          if (pItem->type == diTextEnd)
1088
              editor->pCursors[0].pRun = ME_FindItemBack(pItem, diRun);
1089
          else
1090 1091
              editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
          editor->pCursors[0].nOffset = 0;
1092 1093 1094
      }
  }
}
1095

1096
void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
1097 1098 1099
{
  ME_Cursor tmp_cursor;
  int is_selection = 0;
1100
  BOOL is_shift;
1101 1102 1103
  
  editor->nUDArrowX = -1;
  
1104
  y += ME_GetYScrollPos(editor);
1105 1106 1107

  tmp_cursor = editor->pCursors[0];
  is_selection = ME_IsSelection(editor);
1108
  is_shift = GetKeyState(VK_SHIFT) < 0;
1109

1110 1111
  ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);

1112
  if (x >= editor->selofs || is_shift)
1113
  {
1114 1115 1116
    if (clickNum > 1)
    {
      editor->pCursors[1] = editor->pCursors[0];
1117 1118 1119 1120 1121 1122
      if (is_shift) {
          if (x >= editor->selofs)
              ME_SelectByType(editor, stWord);
          else
              ME_SelectByType(editor, stParagraph);
      } else if (clickNum % 2 == 0) {
1123
          ME_SelectByType(editor, stWord);
1124
      } else {
1125
          ME_SelectByType(editor, stParagraph);
1126
      }
1127
    }
1128
    else if (!is_shift)
1129
    {
1130
      editor->nSelectionType = stPosition;
1131 1132
      editor->pCursors[1] = editor->pCursors[0];
    }
1133 1134 1135
    else if (!is_selection)
    {
      editor->nSelectionType = stPosition;
1136
      editor->pCursors[1] = tmp_cursor;
1137 1138 1139 1140
    }
    else if (editor->nSelectionType != stPosition)
    {
      ME_ExtendAnchorSelection(editor);
1141
    }
1142 1143 1144
  }
  else
  {
1145 1146
    if (clickNum < 2) {
        ME_SelectByType(editor, stLine);
1147
    } else if (clickNum % 2 == 0 || is_shift) {
1148
        ME_SelectByType(editor, stParagraph);
1149 1150
    } else {
        ME_SelectByType(editor, stDocument);
1151
    }
1152
  }
1153 1154
  ME_InvalidateSelection(editor);
  HideCaret(editor->hWnd);
1155
  ME_ShowCaret(editor);
1156 1157
  ME_ClearTempStyle(editor);
  ME_SendSelChange(editor);
1158 1159 1160 1161 1162 1163
}

void ME_MouseMove(ME_TextEditor *editor, int x, int y)
{
  ME_Cursor tmp_cursor;
  
1164 1165
  if (editor->nSelectionType == stDocument)
      return;
1166
  y += ME_GetYScrollPos(editor);
1167 1168

  tmp_cursor = editor->pCursors[0];
1169
  /* FIXME: do something with the return value of ME_FindPixelPos */
1170
  ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1171

1172
  ME_InvalidateSelection(editor);
1173 1174 1175 1176 1177
  editor->pCursors[0] = tmp_cursor;
  ME_ExtendAnchorSelection(editor);

  if (editor->nSelectionType != stPosition &&
      memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1178
  {
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
      /* The scroll the cursor towards the other end, since it was the one
       * extended by ME_ExtendAnchorSelection
       */
      ME_Cursor tmpCursor = editor->pCursors[0];
      editor->pCursors[0] = editor->pCursors[1];
      editor->pCursors[1] = tmpCursor;
      SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
      editor->pCursors[1] = editor->pCursors[0];
      editor->pCursors[0] = tmpCursor;
  } else {
      SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
1190 1191
  }

1192
  ME_InvalidateSelection(editor);
1193 1194
  HideCaret(editor->hWnd);
  ME_ShowCaret(editor);
1195 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);
  pLastRun = pNext;
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
  ME_DisplayItem *pItem, *pOldPara, *pNewPara;
1267
  int x = ME_GetXForArrow(editor, pCursor);
1268

1269 1270
  if (editor->bCaretAtEnd && !pCursor->nOffset)
    pRun = ME_FindItemBack(pRun, diRun);
1271
  if (!pRun)
1272
    return;
1273
  pOldPara = ME_GetParagraph(pRun);
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
    if (!pItem)
      return; /* row not found - ignore */
1310 1311
    /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
    */
1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
    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);
    }
1332 1333 1334
  }
  if (!pItem)
  {
1335
    /* row not found - ignore */
1336 1337 1338 1339 1340 1341 1342
    return;
  }
  pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1343

1344
static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
{
  ME_DisplayItem *pRun = pCursor->pRun;
  ME_DisplayItem *pLast, *p;
  int x, y, ys, yd, yp, yprev;
  ME_Cursor tmp_curs = *pCursor;
  
  x = ME_GetXForArrow(editor, pCursor);
  if (!pCursor->nOffset && editor->bCaretAtEnd)
    pRun = ME_FindItemBack(pRun, diRun);
  
  p = ME_FindItemBack(pRun, diStartRowOrParagraph);
  assert(p->type == diStartRow);
1357 1358
  yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
  yprev = ys = y = yp + p->member.row.pt.y;
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
  yd = y - editor->sizeWindow.cy;
  pLast = p;
  
  do {
    p = ME_FindItemBack(p, diStartRowOrParagraph);
    if (!p)
      break;
    if (p->type == diParagraph) { /* crossing paragraphs */
      if (p->member.para.prev_para == NULL)
        break;
1369
      yp = p->member.para.prev_para->member.para.pt.y;
1370 1371
      continue;
    }
1372
    y = yp + p->member.row.pt.y;
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
    if (y < yd)
      break;
    pLast = p;
    yprev = y;
  } while(1);
  
  pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
  ME_UpdateSelection(editor, &tmp_curs);
  if (yprev < editor->sizeWindow.cy)
  {
    ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
    ME_Repaint(editor);
  }
1386 1387 1388
  else 
  {
    ME_ScrollUp(editor, ys-yprev);
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
  }
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

/* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount 
   of pixels, even if it makes the scroll bar position exceed its normal maximum.
   In such a situation, clicking the scrollbar restores its position back to the
   normal range (ie. sets it to (doclength-screenheight)). */

1399
static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
{
  ME_DisplayItem *pRun = pCursor->pRun;
  ME_DisplayItem *pLast, *p;
  int x, y, ys, yd, yp, yprev;
  ME_Cursor tmp_curs = *pCursor;
  
  x = ME_GetXForArrow(editor, pCursor);
  if (!pCursor->nOffset && editor->bCaretAtEnd)
    pRun = ME_FindItemBack(pRun, diRun);
  
  p = ME_FindItemBack(pRun, diStartRowOrParagraph);
  assert(p->type == diStartRow);
1412 1413
  yp = ME_FindItemBack(p, diParagraph)->member.para.pt.y;
  yprev = ys = y = yp + p->member.row.pt.y;
1414 1415 1416 1417 1418 1419 1420 1421
  yd = y + editor->sizeWindow.cy;
  pLast = p;
  
  do {
    p = ME_FindItemFwd(p, diStartRowOrParagraph);
    if (!p)
      break;
    if (p->type == diParagraph) {
1422
      yp = p->member.para.pt.y;
1423 1424
      continue;
    }
1425
    y = yp + p->member.row.pt.y;
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
    if (y >= yd)
      break;
    pLast = p;
    yprev = y;
  } while(1);
  
  pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
  ME_UpdateSelection(editor, &tmp_curs);
  if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
  {
    ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
    ME_Repaint(editor);
  }
1439 1440 1441
  else 
  {
    ME_ScrollUp(editor,ys-yprev);
1442 1443 1444 1445 1446
  }
  assert(pCursor->pRun);
  assert(pCursor->pRun->type == diRun);
}

1447
static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1448 1449
{
  ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1450
  ME_WrapMarkedParagraphs(editor);
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
  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;
      pCursor->nOffset = 0;
    }
  }
  editor->bCaretAtEnd = FALSE;
}

1467
static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478
{
  ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
  if (pRow) {
    ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
    if (pRun) {
      pCursor->pRun = pRun;
      pCursor->nOffset = 0;
    }
  }
}

1479
static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
{
  ME_DisplayItem *pRow;
  
  if (editor->bCaretAtEnd && !pCursor->nOffset)
    return;
  
  pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
  assert(pRow);
  if (pRow->type == diStartRow) {
    /* FIXME WTF was I thinking about here ? */
    ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
    assert(pRun);
    pCursor->pRun = pRun;
    pCursor->nOffset = 0;
    editor->bCaretAtEnd = 1;
    return;
  }
  pCursor->pRun = ME_FindItemBack(pRow, diRun);
  assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
  pCursor->nOffset = 0;
  editor->bCaretAtEnd = FALSE;
}
      
1503
static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
{
  ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
  assert(p);
  p = ME_FindItemBack(p, diRun);
  assert(p);
  assert(p->member.run.nFlags & MERF_ENDPARA);
  pCursor->pRun = p;
  pCursor->nOffset = 0;
  editor->bCaretAtEnd = FALSE;
}

BOOL ME_IsSelection(ME_TextEditor *editor)
{
  return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
}

1520
static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1521 1522 1523 1524 1525 1526 1527 1528
{
  int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
  
  if (cdir*dir>0)
    return 0;
  else
    return 1;
}
1529 1530

BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1531 1532 1533 1534 1535 1536 1537 1538
{
  ME_Cursor old_anchor = editor->pCursors[1];
  
  if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
  {
    /* any selection was present ? if so, it's no more, repaint ! */
    editor->pCursors[1] = editor->pCursors[0];
    if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1539
      return TRUE;
1540
    }
1541
    return FALSE;
1542 1543 1544 1545 1546 1547
  }
  else
  {
    if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
    {
      editor->pCursors[1] = *pTempCursor;
1548
      return TRUE;
1549 1550 1551 1552
    }
  }

  ME_Repaint(editor);
1553 1554 1555
  return TRUE;
}

1556 1557 1558 1559 1560 1561 1562
void ME_DeleteSelection(ME_TextEditor *editor)
{
  int from, to;
  ME_GetSelection(editor, &from, &to);
  ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
}

1563 1564
ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
{
1565
  return ME_GetInsertStyle(editor, 0);
1566 1567
}

1568 1569 1570
void ME_SendSelChange(ME_TextEditor *editor)
{
  SELCHANGE sc;
1571

1572 1573
  if (!(editor->nEventMask & ENM_SELCHANGE))
    return;
1574
  
1575 1576 1577 1578 1579 1580 1581 1582 1583
  sc.nmhdr.hwndFrom = editor->hWnd;
  sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
  sc.nmhdr.code = EN_SELCHANGE;
  SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
  sc.seltyp = SEL_EMPTY;
  if (sc.chrg.cpMin != sc.chrg.cpMax)
    sc.seltyp |= SEL_TEXT;
  if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
    sc.seltyp |= SEL_MULTICHAR;
1584 1585 1586 1587 1588 1589
  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)
  {
1590 1591
    ME_ClearTempStyle(editor);

1592 1593 1594
    editor->notified_cr = sc.chrg;
    SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
  }
1595 1596
}

1597
BOOL
1598
ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1599 1600 1601 1602
{
  int nCursor = 0;
  ME_Cursor *p = &editor->pCursors[nCursor];
  ME_Cursor tmp_curs = *p;
1603
  BOOL success = FALSE;
1604
  
1605
  ME_CheckCharOffsets(editor);
1606
  switch(nVKey) {
1607 1608
    case VK_LEFT:
      editor->bCaretAtEnd = 0;
1609 1610 1611 1612
      if (ctrl)
        success = ME_MoveCursorWords(editor, &tmp_curs, -1);
      else
        success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1613 1614 1615
      break;
    case VK_RIGHT:
      editor->bCaretAtEnd = 0;
1616 1617 1618 1619
      if (ctrl)
        success = ME_MoveCursorWords(editor, &tmp_curs, +1);
      else
        success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1620
      break;
1621
    case VK_UP:
1622 1623
      ME_MoveCursorLines(editor, &tmp_curs, -1);
      break;
1624
    case VK_DOWN:
1625 1626
      ME_MoveCursorLines(editor, &tmp_curs, +1);
      break;
1627
    case VK_PRIOR:
1628 1629
      ME_ArrowPageUp(editor, &tmp_curs);
      break;
1630
    case VK_NEXT:
1631 1632
      ME_ArrowPageDown(editor, &tmp_curs);
      break;
1633
    case VK_HOME: {
1634
      if (ctrl)
1635
        ME_ArrowCtrlHome(editor, &tmp_curs);
1636
      else
1637
        ME_ArrowHome(editor, &tmp_curs);
1638
      editor->bCaretAtEnd = 0;
1639
      break;
1640 1641
    }
    case VK_END: 
1642
      if (ctrl)
1643
        ME_ArrowCtrlEnd(editor, &tmp_curs);
1644
      else
1645 1646
        ME_ArrowEnd(editor, &tmp_curs);
      break;
1647
  }
1648 1649 1650 1651 1652
  
  if (!extend)
    editor->pCursors[1] = tmp_curs;
  *p = tmp_curs;
  
1653 1654
  ME_InvalidateSelection(editor);
  ME_Repaint(editor);
1655 1656 1657 1658 1659
  HideCaret(editor->hWnd);
  ME_EnsureVisible(editor, tmp_curs.pRun); 
  ME_ShowCaret(editor);
  ME_SendSelChange(editor);
  return success;
1660
}