WPF TextBox Intercepting RoutedUICommands

Question

I am trying to get Undo/Redo keyboard shortcuts working in my WPF application (I have my own custom functionality implemented using the Command Pattern). It seems, however, that the `TextBox` control is intercepting my "Undo" RoutedUICommand. What is the simplest way to disable this so that I can catch Ctrl+Z at the root of my UI tree? I would like to avoid putting a ton of code/XAML into each `TextBox` in my application if possible. The following briefly demonstrates the problem: ```

Accepted Answer

There is no straightforward way to supress all bindings, do not set `IsUndoEnabled` to `false` as it will only trap and flush Ctrl + Z key binding. You need to redirect `CanUndo`, `CanRedo`, `Undo` and `Redo`. Here is how I do it with my `UndoServiceActions` singleton.

```
textBox.CommandBindings.Add(new CommandBinding(ApplicationCommands.Undo,
                                               UndoCommand, CanUndoCommand));
textBox.CommandBindings.Add(new CommandBinding(ApplicationCommands.Redo,
                                               RedoCommand, CanRedoCommand));

private void CanRedoCommand(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = UndoServiceActions.obj.UndoService.CanRedo;
    e.Handled = true;
}

private void CanUndoCommand(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = UndoServiceActions.obj.UndoService.CanUndo;
    e.Handled = true;
}

private void RedoCommand(object sender, ExecutedRoutedEventArgs e)
{
    UndoServiceActions.obj.UndoService.Redo();
    e.Handled = true;
}

private void UndoCommand(object sender, ExecutedRoutedEventArgs e)
{
    UndoServiceActions.obj.UndoService.Undo();
    e.Handled = true;
}
```

WPF TextBox Intercepting RoutedUICommands

Solution

Problem

Related problems