Handling shortcuts in WPF application

This is a sketchy post, to be completed or discarded later on. The objectives was having inheritance and minimizing the instantiation code.

This is the base class.


public class KeyShortcutBase
{
    private readonly RoutedCommand _command;

    private readonly CommandBinding _commandBinding;

    protected KeyShortcutBase()
    {
        this._command = new RoutedCommand();

        this._commandBinding = new CommandBinding(
            this._command,
            OnExecuted,
            OnCanExecute);
    }

    public void ConnectShortcut(
        UIElement host, InputGesture gesture)
    {
        this.ConnectShortcut(host, new[] { gesture });
    }

    public void ConnectShortcut(
        UIElement host, IEnumerable<InputGesture> gestures)
    {
        foreach (var gesture in gestures)
        {
            this._command.InputGestures.Add(gesture);
        }

        if (host != null)
        {
            host.CommandBindings.Add(this._commandBinding);
        }
    }

    protected virtual void OnCanExecute(
        object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = false;
    }

    protected virtual void OnExecuted(
        object sender, ExecutedRoutedEventArgs e)
    {
    }
}

This is an extension class allowing shorter calls.

public static class KeyShortcutExtender

{

    public static void ConnectShortcut(

        this UIElement host, 

        KeyShortcutBase shortcut, 

        IEnumerable<InputGesture> gestures)

    {

        shortcut.ConnectShortcut(host, gestures);

    }

    public static void ConnectShortcut(

        this UIElement host, 

        KeyShortcutBase shortcut, 

        InputGesture gesture)

    {

        shortcut.ConnectShortcut(host, gesture);

    }

}

This is a subclass.

public class FindItemShortcut : KeyShortcutBase

{

    protected override void OnCanExecute(

        object sender,

        CanExecuteRoutedEventArgs e)

    {

        e.CanExecute = true;

    }

    protected override void OnExecuted(

        object sender,

        ExecutedRoutedEventArgs e)

    {

        MessageBox.Show(this.GetType().ToString());

    }

}

The subclass is instantiated in WPF Window with a single shortcut.

this.ConnectShortcut(

    new FindItemShortcut(), 

    new KeyGesture(Key.F, (ModifierKeys)6));

... and with multiple shortcuts.

this.ConnectShortcut(

    new FindItemShortcut(), 

    new InputGesture[]

        {

            new KeyGesture(Key.F, (ModifierKeys)6), 

            new KeyGesture(Key.S, ModifierKeys.Control), 

            new MouseGesture(MouseAction.RightDoubleClick)

        });

So far so good...