private void InternalAddCommand(ICommand command)
{
Debug.Assert(MaxUndoLevel != 0);
_undoStack.Push(command);
_redoStack.Clear();
}
public void Clear_WithNonEmptyUndoAndRedoStacks_CanUndoIsFalse()
{
_undoRedoStack.AddAndExecute(new TestCommand());
_undoRedoStack.AddAndExecute(new TestCommand());
_undoRedoStack.Undo();
_undoRedoStack.Clear();
Assert.AreEqual(false, _undoRedoStack.CanUndo);
}
public void NewCommand(string undoActionName, string rtf, string text, int index)
{
int popIndex;
switch (undoActionName)
{
case "Typing":
if (!"Typing".Equals(_lastUndoActionName))
{
if (!string.IsNullOrEmpty(text) && _undoStack.Count == 1 && !string.IsNullOrEmpty(_lastUndoActionName))
{
//this is an special case where we have emptied the stack (because an undo), there is some text in the editor
//and we start typing again, then we save the current status (previously removed by undo) and
//then we start saving the new status.
if (!string.IsNullOrEmpty(_lastRemovedRtf))
{
_undoStack.Push(_lastRemovedRtf, _lastIndex);
}
_undoStack.Push(rtf, index);
_lastUndoActionName = undoActionName;
}
else
{
//normal case
_undoStack.Push(rtf, index);
_lastUndoActionName = undoActionName;
}
}
else
{
//here we have 2 cases (one for typing and one for backspace)
if (text.Length > _lastSavedText.Length)
{
//if (!_undoStack.IsEmpty()) _undoStack.Pop(out popIndex);
_undoStack.Push(rtf, index);
_lastUndoActionWasBackspace = false;
}
else
{
_undoStack.Push(rtf, index);
_lastUndoActionWasBackspace = true;
}
}
_redoStack.Clear();
_lastSavedText = text;
break;
case "Cut":
case "Paste":
case "Delete":
UndoStackManipulation(undoActionName, rtf, text, index, out popIndex);
break;
}
}
/// <summary>Clears all information from the undo redo buffer.</summary>
public void ClearUndo()
{
_undoUnitCommands.Clear();
_undoStack.Clear();
_redoStack.Clear();
RefreshCanUndoCanRedo();
}
public void Push(List <UndoRedoInstance> instance)
{
if (!StackValid(_undoStack))
{
return;
}
_undoStack.Push(instance);
_redoStack.Clear();
UndoStackChanged?.Invoke(this, new EventArgs());
}
private void Clear(UndoRedoStack stack, bool silent = false)
{
if (!StackValid(stack))
{
return;
}
stack.Clear();
if (!silent)
{
UndoStackChanged?.Invoke(this, new EventArgs());
}
}
private void CloseDocument()
{
UndoRedoStack.Clear();
Pages.Clear();
}