packages/MaterialDesignThemes.2.5.1/src/net45/ListBoxAssist.cs

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using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace MaterialDesignThemes.Wpf
{
    public static class ListBoxAssist
    {
        static ListBoxAssist()
        {
            EventManager.RegisterClassHandler(typeof (ListBox), UIElement.PreviewMouseLeftButtonDownEvent,
                new MouseButtonEventHandler(ListBoxMouseButtonEvent));
        }

        private static void ListBoxMouseButtonEvent(object sender, MouseButtonEventArgs mouseButtonEventArgs)
        {
            var senderElement = (UIElement) sender;

            if (!GetIsToggle(senderElement)) return;

            var point = mouseButtonEventArgs.GetPosition(senderElement);
            var result = VisualTreeHelper.HitTest(senderElement, point);

            if (result == null) return;

            ListBoxItem listBoxItem = null;
            Ripple ripple = null;
            foreach (var dependencyObject in result.VisualHit.GetVisualAncestry().TakeWhile(_ => listBoxItem == null))
            {
                listBoxItem = dependencyObject as ListBoxItem;
                if (ripple == null)
                    ripple = dependencyObject as Ripple;
            }

            if (listBoxItem == null) return;

            listBoxItem.SetCurrentValue(ListBoxItem.IsSelectedProperty, !listBoxItem.IsSelected);
            mouseButtonEventArgs.Handled = true;

            if (ripple != null && listBoxItem.IsSelected)
            {
                ripple.RaiseEvent(new MouseButtonEventArgs(mouseButtonEventArgs.MouseDevice, mouseButtonEventArgs.Timestamp, mouseButtonEventArgs.ChangedButton)
                { RoutedEvent = Control.PreviewMouseLeftButtonDownEvent, Source = ripple }
                );
            }
        }

        public static readonly DependencyProperty IsToggleProperty = DependencyProperty.RegisterAttached(
            "IsToggle", typeof(bool), typeof(ListBoxAssist), new FrameworkPropertyMetadata(default(bool)));

        public static void SetIsToggle(DependencyObject element, bool value)
        {
            element.SetValue(IsToggleProperty, value);
        }

        public static bool GetIsToggle(DependencyObject element)
        {
            return (bool)element.GetValue(IsToggleProperty);