RadDiagram HowTo add shape into UndoRedoStack after editing a custom property of the shape

[Timon]

Hello everybody,

I have a RaDiagram which will be filled via MVVM.

Additionally my shapes and connections have custom properties - for the sake of convenience let's say every shape has a status property.

I customized the SettingsPane, so when entering a shape's SettingsPane I have a checkbox which changes the status property of the shape.
Checked -> shape.status = 1
Unchecked -> shape.status = 0

This is working fine.

Additionally I have a flag in my ViewModel which will be updated after the status change, so that my CanExecuteUndoCommand will set

1.e.CanExecute = True
2.e.Handled = True

 

Unfortunately the UndoRedoStack of the diagram tells me that there is nothing in the stack.
I guess that the UndoCommand (and of course the RedoCommand) only handles the default "Content" property of a shape.

Can you give me an example how I can extend your functionality, to the RadDiagram, that changing custom properties of a shape also fill the UndoRedoStack.

Thanks in advance,
Timon

[Martin Ivanov]

Hello Timon,

To achieve your requirement you can use the UndoableDelegateCommand class and the diagram's UndoRedoService. Here is an example in code:

UndoRedoService service = diagram.ServiceLocator.GetService<IUndoRedoService>() as UndoRedoService;
UndoableDelegateCommand undoableCommand = new UndoableDelegateCommand("CheckCommand",
    (o) => {
        // set the new status
    },
    (o) => {
        // set the previous status
    });
service.ExecuteCommand(undoableCommand);

The last two arguments passed to the constructor of the command class are the action that is currently executed and the undo action.

I hope this helps.

Regards,
Martin
Telerik by Progress

[Timon]

Hi Martin,

Thank you for your response. I managed to implement it and it's working.

Regards
Timon