TImageEnProc.CanUndo
Declaration
property CanUndo: Boolean;Description
Returns True when there are entries in the Undo stack (i.e. so Undo can be used).Note: CanUndo will be False after calling ClearAllUndo or ClearUndo if there is only one saved image.
Demo
 | Demos\ImageEditing\UndoRedo\UndoRedo.dpr |
Example
procedure TMainForm.btnUndoClick(Sender: TObject);begin
If ImageEnView1.Proc.CanUndo then
ImageEnView1.Proc.Undo
else
ShowMessage('Nothing to Undo!');
end;