WPF effect Article 191 box selection listbox

The previous effect is based on ListBox Achieved a little different effect ; Today, the box selection is improved again on the original basis ListBox; The final effect , Here's the picture :

1、 Used VisualTreeHelper Of HitTest Method :

Point point2 = e.GetPosition(LedListBox);
 Rect rect = new Rect(origContentMouseDownPoint, point2);
 RectangleGeometry rectangleGeometry = new RectangleGeometry(rect);
 VisualTreeHelper.HitTest(LedListBox, new HitTestFilterCallback(OnHitTestFilterCallback), new HitTestResultCallback(OnHitTestResultCallback), new GeometryHitTestParameters(rectangleGeometry));

2、 About OnHitTestFilterCallback:

private HitTestFilterBehavior OnHitTestFilterCallback(DependencyObject target)
 {
     UIElement element = target as UIElement;
     if(element != null)
     {
         var img = element as CheckBox;
         if(img != null && img.IsVisible == true)
         {
             img.IsChecked = true;
             return HitTestFilterBehavior.Continue;
         }
     }
     return HitTestFilterBehavior.Continue;
 }

The final simple effect is this ; If you have time later , You can explore more complex effects ; Programming never stops 、Bug More than 、 nothing Bug、 No life ; Change bug Calm down 、 The passion of coding 、 Joy after completion 、 The excitement of digging a hole 、 The excitement of filling the hole ; Maybe that's the fun of lousy programmers ; Come here today ; I hope I have the motivation to persist step by step ; Life is endless , Code is more than ; You can take time to see the effect of today's sharing , Have good opinions and ideas , You can leave a message on the message board ; I will reply you as soon as I see it , Thank you for your attention and support ! If it feels good , Then reach out your little hand, praise and pay attention to ！