caret.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/*
 * RichEdit - Caret and selection functions.
 *
 * Copyright 2004 by Krzysztof Foltman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "editor.h"

WINE_DEFAULT_DEBUG_CHANNEL(richedit);

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);   
}


int ME_GetTextLengthEx(ME_TextEditor *editor, GETTEXTLENGTHEX *how)
{
  int length;
  
  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);
  
  if (how->flags & GTL_USECRLF)
    length += editor->nParagraphs;
  
  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; 
}


void ME_SetSelection(ME_TextEditor *editor, int from, int to)
{
  if (from == 0 && to == -1)
  {
    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; 
    ME_Repaint(editor);
    ME_ClearTempStyle(editor);
    return;
  }
  if (from == -1)
  {
    editor->pCursors[1] = editor->pCursors[0]; 
    ME_Repaint(editor);
    ME_ClearTempStyle(editor);
    return;
  }
  if (from>to)
  {
    int tmp = from;
    from = to;
    to = tmp;
  }
  ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
  ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);  
}

void ME_MoveCaret(ME_TextEditor *editor)
{
  HDC hDC = GetDC(editor->hWnd);
  ME_Context c;

  ME_Cursor *pCursor = &editor->pCursors[0];
  ME_DisplayItem *pCursorRun = pCursor->pRun;
  ME_DisplayItem *pSizeRun = pCursor->pRun;
  
  ME_InitContext(&c, editor, hDC);
  assert(!pCursor->nOffset || !editor->bCaretAtEnd);
  
  if (pCursorRun->type == diRun) {
    ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
    if (row) {
      ME_DisplayItem *run = pCursorRun;
      ME_DisplayItem *para;
      SIZE sz = {0, 0};
      if (!pCursor->nOffset && !editor->bCaretAtEnd)
      {
        ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrStartRow);
        if (prev->type == diRun)
          pSizeRun = prev;
      }
      assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
      para = ME_FindItemBack(row, diParagraph);
      if (editor->bCaretAtEnd && !pCursor->nOffset && 
          run == ME_FindItemFwd(row, diRun))
      {
        ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
        if (tmp->type == diRun)
        {
          row = ME_FindItemBack(tmp, diStartRow);
          pSizeRun = run = tmp;
          sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, ME_StrLen(run->member.run.strText));
        }
      }
      if (pCursor->nOffset && !(run->member.run.nFlags & MERF_SKIPPED)) {
        sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset);
      }
      CreateCaret(editor->hWnd, NULL, 0, pSizeRun->member.run.nAscent+pSizeRun->member.run.nDescent);
      SetCaretPos(run->member.run.pt.x+sz.cx,
        para->member.para.nYPos+row->member.row.nBaseline+pSizeRun->member.run.pt.y-pSizeRun->member.run.nAscent-ME_GetYScrollPos(editor));
    } else {
      assert(0 == "Wrapped paragraph run without a row?");
      CreateCaret(editor->hWnd, NULL, 0, 10);
      SetCaretPos(0,0);
    }
  }  
  else {
    assert(0 == "Cursor not on a run");
    CreateCaret(editor->hWnd, NULL, 0, 10); /* FIXME use global font */
    SetCaretPos(0,0);
  }
  ME_DestroyContext(&c);
  ReleaseDC(editor->hWnd, hDC);
}

void ME_ShowCaret(ME_TextEditor *ed)
{
  ME_MoveCaret(ed);
  ShowCaret(ed->hWnd);
}

void ME_HideCaret(ME_TextEditor *ed)
{
  HideCaret(ed->hWnd);
  DestroyCaret();
}

void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs, 
  int nChars)
{
  ME_Cursor c;
  int shift = 0;
  
  while(nChars > 0)
  {
    ME_Run *run;
    ME_CursorFromCharOfs(editor, nOfs, &c);
    run = &c.pRun->member.run;
    if (run->nFlags & MERF_ENDPARA) {
      if (!ME_FindItemFwd(c.pRun, diParagraph))
      {
        return;
      }
      ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
      /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
      ME_CheckCharOffsets(editor);
      nChars--;
      if (editor->bEmulateVersion10 && nChars)
        nChars--;
      continue;
    }
    else
    {
      ME_Cursor cursor;
      int nIntendedChars = nChars;
      int nCharsToDelete = nChars;
      int i;
      int loc = c.nOffset;
      
      ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
      
      cursor = c;
      ME_StrRelPos(run->strText, loc, &nChars);
      /* nChars is the number of characters that should be deleted from the
         FOLLOWING runs (these AFTER cursor.pRun)
         nCharsToDelete is a number of chars to delete from THIS run */
      nCharsToDelete -= nChars;
      shift -= nCharsToDelete;
      TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n", 
        nCharsToDelete, nIntendedChars, nChars, c.nOffset, 
        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)
          pUndo->di.member.run.nCharOfs = nOfs;
      }
      else
      {
        /* undo = reinsert partial run */
        ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
        if (pUndo) {
          ME_DestroyString(pUndo->di.member.run.strText);
          pUndo->di.member.run.nCharOfs = nOfs;
          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;
    }
  }
}

void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor, 
  int nChars)
{  
  assert(nCursor>=0 && nCursor<editor->nCursors);
  ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
}

static WCHAR wszSpace[] = {' ', 0};

/* FIXME this is temporary, just to have something to test how bad graphics handler is */
void ME_InsertGraphicsFromCursor(ME_TextEditor *editor, int nCursor)
{
  ME_Cursor *pCursor = &editor->pCursors[nCursor];
  ME_DisplayItem *pItem = NULL;
  ME_DisplayItem *pNewRun = NULL;
  ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
  ME_UndoItem *pUndo;
  
  /* FIXME no no no */
  if (ME_IsSelection(editor))
    ME_DeleteSelection(editor);

  pUndo = ME_AddUndoItem(editor, diUndoDeleteRun, NULL);
  if (pUndo) {
    pUndo->nStart = pCursor->nOffset + pCursor->pRun->member.run.nCharOfs + ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs;
    pUndo->nLen = 1;
  }
  if (pCursor->nOffset)
  {
    ME_SplitRunSimple(editor, pCursor->pRun, pCursor->nOffset);
  }
  pItem = pCursor->pRun;
  pNewRun = ME_MakeRun(pStyle, ME_MakeStringN(wszSpace, 1), MERF_GRAPHICS);
  pNewRun->member.run.nCharOfs = pCursor->pRun->member.run.nCharOfs;
  ME_InsertBefore(pCursor->pRun, pNewRun);
  ME_PropagateCharOffset(pItem, 1);
  ME_CheckCharOffsets(editor);
  ME_SendSelChange(editor);
}


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

  editor->bCaretAtEnd = FALSE;
  
  assert(p->pRun->type == diRun);
  
  ME_AddRefStyle(style);
  
  pNewRun = ME_MakeRun(style, ME_MakeStringN(str, len), flags); /* addrefs style */
  ME_InsertRun(editor, ME_CharOfsFromRunOfs(editor, p->pRun, p->nOffset), pNewRun);
  ME_DestroyDisplayItem(pNewRun);
  ME_ReleaseStyle(style);
}


void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor, 
  const WCHAR *str, int len, ME_Style *style)
{
  const WCHAR *pos;
  ME_Cursor *p = NULL;

  assert(style);

  /* FIXME really HERE ? */
  if (ME_IsSelection(editor))
    ME_DeleteSelection(editor);

  assert(nCursor>=0 && nCursor<editor->nCursors);
  if (len == -1)
    len = lstrlenW(str);
  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';

      if (pos!=str)
        ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
    
      ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 
      pos++;
      if(pos-str <= len) {
        len -= pos - str;
        str = pos;
        continue;
      }
    }
    if (pos-str < len) {   /* handle EOLs */
      ME_DisplayItem *tp, *end_run;
      ME_Paragraph *para;
      ME_Style *tmp_style;
      if (pos!=str)
        ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);