ME_UndoItem* ME_AddUndoItem	(	ME_TextEditor *	editor,
		ME_DIType	type,
		const ME_DisplayItem *	pdi
	)
Definition at line 51 of file undo.c.
Referenced by ME_CommitCoalescingUndo(), ME_CommitUndo(), ME_InsertRunAtCursor(), ME_InternalDeleteText(), ME_JoinParagraphs(), ME_PlayUndoItem(), ME_Redo(), ME_SetCharFormat(), ME_SetParaFormat(), ME_SplitParagraph(), and ME_Undo().
                                                                                              {
  if (editor->nUndoMode == umIgnore)
    return NULL;
  else if (editor->nUndoLimit == 0)
    return NULL;
  else
  {
    ME_DisplayItem *pItem = ALLOC_OBJ(ME_UndoItem);
    switch(type)
    {
    case diUndoPotentialEndTransaction:
        /* only should be added for manually typed chars, not undos or redos */
        assert(editor->nUndoMode == umAddToUndo);
        /* intentional fall-through to next case */
    case diUndoEndTransaction:
      break;
    case diUndoSetParagraphFormat:
      assert(pdi);
      pItem->member.para = pdi->member.para;
      pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
      *pItem->member.para.pFmt = *pdi->member.para.pFmt;
      break;
    case diUndoInsertRun:
      assert(pdi);
      pItem->member.run = pdi->member.run;
      pItem->member.run.strText = ME_StrDup(pItem->member.run.strText);
      ME_AddRefStyle(pItem->member.run.style);
      if (pdi->member.run.ole_obj)
      {
        pItem->member.run.ole_obj = ALLOC_OBJ(*pItem->member.run.ole_obj);
        ME_CopyReObject(pItem->member.run.ole_obj, pdi->member.run.ole_obj);
      }
      else pItem->member.run.ole_obj = NULL;
      break;
    case diUndoSetCharFormat:
      break;
    case diUndoDeleteRun:
    case diUndoJoinParagraphs:
      break;
    case diUndoSplitParagraph:
    {
      ME_DisplayItem *prev_para = pdi->member.para.prev_para;
      assert(pdi->member.para.pFmt->cbSize == sizeof(PARAFORMAT2));
      pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
      pItem->member.para.pFmt->cbSize = sizeof(PARAFORMAT2);
      pItem->member.para.pFmt->dwMask = 0;
      *pItem->member.para.pFmt = *pdi->member.para.pFmt;
      pItem->member.para.border = pdi->member.para.border;
      pItem->member.para.nFlags = prev_para->member.para.nFlags & ~MEPF_CELL;
      pItem->member.para.pCell = NULL;
      break;
    }
    default:
      assert(0 == "AddUndoItem, unsupported item type");
      return NULL;
    }
    pItem->type = type;
    pItem->prev = NULL;
    if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
    {
      if (editor->pUndoStack
          && editor->pUndoStack->type == diUndoPotentialEndTransaction)
      {
          editor->pUndoStack->type = diUndoEndTransaction;
      }
      if (editor->nUndoMode == umAddToUndo)
        TRACE("Pushing id=%s to undo stack, deleting redo stack\n", ME_GetDITypeName(type));
      else
        TRACE("Pushing id=%s to undo stack\n", ME_GetDITypeName(type));

      pItem->next = editor->pUndoStack;
      if (type == diUndoEndTransaction || type == diUndoPotentialEndTransaction)
        editor->nUndoStackSize++;
      if (editor->pUndoStack)
        editor->pUndoStack->prev = pItem;
      else
        editor->pUndoStackBottom = pItem;
      editor->pUndoStack = pItem;
      
      if (editor->nUndoStackSize > editor->nUndoLimit)
      { /* remove oldest undo from stack */
        ME_DisplayItem *p = editor->pUndoStackBottom;
        while (p->type !=diUndoEndTransaction)
          p = p->prev; /*find new stack bottom */
        editor->pUndoStackBottom = p->prev;
          editor->pUndoStackBottom->next = NULL;
        do
        {
          ME_DisplayItem *pp = p->next;
          ME_DestroyDisplayItem(p);
          p = pp;
        } while (p);
        editor->nUndoStackSize--;
      }
      /* any new operation (not redo) clears the redo stack */
      if (editor->nUndoMode == umAddToUndo) {
        ME_DisplayItem *p = editor->pRedoStack;
        while(p)
        {
          ME_DisplayItem *pp = p->next;
          ME_DestroyDisplayItem(p);
          p = pp;
        }
        editor->pRedoStack = NULL;
      }
    }
    else if (editor->nUndoMode == umAddToRedo)
    {
      TRACE("Pushing id=%s to redo stack\n", ME_GetDITypeName(type));
      pItem->next = editor->pRedoStack;
      if (editor->pRedoStack)
        editor->pRedoStack->prev = pItem;
      editor->pRedoStack = pItem;
    }
    else
      assert(0);
    return (ME_UndoItem *)pItem;
  }
}
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