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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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);
}
}
}
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