Undo in Custom Tool

[MNP]

I noticed in your watermark example, any change isn't saved on the undo stack.

Is there a way on a custom tool you can programmically add to the undo stack?

Thanks

-Matt

[Iva Toteva]

Hello Matt,

There are two types of operations that can be performed on an image in the editor - Tools and Commands. You can read more about the difference between the two and how they work here.
In a nut shell, tools are able to generate a live preview of the effect you are applying on the image with different parameters. When you hit enter, the tool is committed, i.e. a command with the parameters from its SettingsUI is executed and registered in the undo/redo stack. Then, the effect of this command can be reversed and reapplied on undo/redo.
I hope this helps.

Best wishes,
Iva
the Telerik team