protected override UndoToken Redo(object parameter, bool creatingActionItem)
{
UndoToken token;
object index;
var modelNode = NodePath.GetSourceNode(out index);
if (modelNode == null)
{
throw new InvalidOperationException("Unable to retrieve the node on which to apply the redo operation.");
}
var currentValue = modelNode.GetValue(index);
var newValue = NodeCommand.Invoke(currentValue, parameter, out token);
modelNode.SetValue(newValue, index);
Refresh(modelNode, index);
var additionalToken = new UndoToken();
if (AdditionalCommand != null)
{
additionalToken = AdditionalCommand.ExecuteCommand(null, false);
}
return(new UndoToken(token.CanUndo, new ModelNodeToken(token, additionalToken)));
}
private void RaiseAdditionalCommand()
{
if (AdditionalCommand != null)
{
RoutedCommand rc = AdditionalCommand as RoutedCommand;
if (rc != null)
{
rc.Execute(AdditionalCommandParameter, null);
}
else
{
AdditionalCommand.Execute(AdditionalCommandParameter);
}
}
}
protected override void Undo(object parameter, UndoToken token)
{
object index;
var modelNode = NodePath.GetSourceNode(out index);
if (modelNode == null)
{
throw new InvalidOperationException("Unable to retrieve the node on which to apply the undo operation.");
}
var modelNodeToken = (ModelNodeToken)token.TokenValue;
var currentValue = modelNode.GetValue(index);
var newValue = NodeCommand.Undo(currentValue, modelNodeToken.Token);
modelNode.SetValue(newValue, index);
Refresh(modelNode, index);
AdditionalCommand?.UndoCommand(null, modelNodeToken.AdditionalToken);
}
