Add "Command" property for ToggleSwitch control

[alex-buraykin]

Add "Command" property for ToggleSwitch control

[alex-buraykin]

AttachedProperty:

using System;
using System.Windows;
using System.Windows.Input;
using MahApps.Metro.Controls;

namespace e3Shell.StandMaterialsSpecification.Behaviors
{
    public class ToggleSwitchBehavior
    {
        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.RegisterAttached("Command", typeof(ICommand), typeof(ToggleSwitchBehavior),
                new UIPropertyMetadata(null, OnIsExternalChanged));

        public static ICommand GetCommand(DependencyObject obj)
        {
            return (ICommand)obj.GetValue(CommandProperty);
        }

        public static void SetCommand(DependencyObject obj, ICommand value)
        {
            obj.SetValue(CommandProperty, value);
        }

        private static void OnIsExternalChanged(object sender, DependencyPropertyChangedEventArgs args)
        {
            var toggleSwitch = sender as ToggleSwitch;
            if (toggleSwitch == null) return;

            if (args.NewValue != null)
                toggleSwitch.IsCheckedChanged += IsCheckedChangedHandler;
            else
                toggleSwitch.IsCheckedChanged -= IsCheckedChangedHandler;
        }

        private static void IsCheckedChangedHandler(object sender, EventArgs e)
        {
            var command = GetCommand((ToggleSwitch)sender);
            if (command.CanExecute(null))
                command.Execute(null);
        }
    }
}

In your XAML:

xmlns:behaviors="clr-namespace:e3Shell.StandMaterialsSpecification.Behaviors"

<controls:ToggleSwitch behaviors:ToggleSwitchBehavior.Command="{Binding Path=OpenAboutFlyoutCommand}"/>