UnDo problem

GoDiagram (6 and previous)
1

Hi Walter,
In the ProtoApp sample.
When I undoed renaming a node, the GraphView.OnPropertyChanged method was called. But in my program. It wasn’t called.
Tell me why. Help me resolve the problem

2

It seems odd that a GoView property would be changed just from undoing or redoing a change to a GoText object and a change to a GoSimpleNode object. There must be something that the ProtoApp application is doing specially.
What is the GoView property that was changed in the case that you are interested in?

3

The purpose of overriding the OnPropertyChanged method is Updating Form Info. I want change the title of View after undoing too. Here is the code
///


/// If the view’s document is replaced, update the title;
/// if the view’s scale changes, update the status bar
///
///
protected override void OnPropertyChanged(PropertyChangedEventArgs evt) {
base.OnPropertyChanged(evt);
if (evt.PropertyName == “Document”)
UpdateFormInfo();
else if (evt.PropertyName == “DocScale”)
MainForm.App.SetStatusZoom(this.DocScale);
}

4

Yes, but how is it that a view property is changed as a result of a GoObject change, in your application? And why isn’t the same mechanism invoked via the undo/redo action’s call to GoObject.ChangeValue? (I suppose your particular GoObject change actually corresponds to the GoText.ChangedText subhint/case.)