1 files changed, 99 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Tango.Touch/Controls/TouchVirtualizedContentControl.cs b/Software/Visual_Studio/Tango.Touch/Controls/TouchVirtualizedContentControl.cs
new file mode 100644
index 000000000..02240ecc8
--- /dev/null
+++ b/Software/Visual_Studio/Tango.Touch/Controls/TouchVirtualizedContentControl.cs
@@ -0,0 +1,99 @@
+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.Markup;
+using System.Windows.Shapes;
+using Tango.Core.Threading;
+
+namespace Tango.Touch.Controls
+{
+    [ContentProperty(nameof(Content))]
+    public class TouchVirtualizedContentControl : Control
+    {
+        private LightTouchScrollViewer _scrollViewer;
+        private ContentPresenter _innerBorder;
+        private ActionTimer _updateTimer;
+        private Point _location;
+        private bool _loaded;
+
+        public UIElement Content
+        {
+            get { return (UIElement)GetValue(ContentProperty); }
+            set { SetValue(ContentProperty, value); }
+        }
+        public static readonly DependencyProperty ContentProperty =
+            DependencyProperty.Register("Content", typeof(UIElement), typeof(TouchVirtualizedContentControl), new PropertyMetadata(null));
+
+        static TouchVirtualizedContentControl()
+        {
+            DefaultStyleKeyProperty.OverrideMetadata(typeof(TouchVirtualizedContentControl), new FrameworkPropertyMetadata(typeof(TouchVirtualizedContentControl)));
+        }
+
+        public TouchVirtualizedContentControl()
+        {
+            _updateTimer = new ActionTimer(TimeSpan.FromMilliseconds(200));
+            Loaded += TouchVirtualizedContentControl_Loaded;
+        }
+
+        public override void OnApplyTemplate()
+        {
+            base.OnApplyTemplate();
+            _innerBorder = GetTemplateChild("PART_innerBorder") as ContentPresenter;
+        }
+
+        private void TouchVirtualizedContentControl_Loaded(object sender, System.Windows.RoutedEventArgs e)
+        {
+            _scrollViewer = this.FindAncestor<LightTouchScrollViewer>();
+            _scrollViewer.Scrolling += _scrollViewer_Scrolling;
+
+            _location = this.TranslatePoint(new Point(0, 0), _scrollViewer);
+
+            ApplyOptimization();
+            _loaded = true;
+        }
+
+        private void _scrollViewer_Scrolling(object sender, DoubleValueChangedEventArgs e)
+        {
+            if (_loaded)
+            {
+                //_updateTimer.ResetReplace(() => 
+                //{
+                //    Dispatcher.BeginInvoke(new Action(() => 
+                //    {
+                        ApplyOptimization();
+                //    }));
+                //});
+            }
+        }
+
+        private void ApplyOptimization()
+        {
+            //var _border_viewport = _scrollViewer.GetViewportBorder();
+
+            //if (_border_viewport.IsAncestorOf(this))
+            //{
+            //    //Point relativeLocation = this.TranslatePoint(new Point(0, 0), _border_viewport);
+            //    //Rect bounds = this.TransformToAncestor(_border_viewport).TransformBounds(new Rect(0.0, 0.0, this.ActualWidth, this.ActualHeight));
+            //    //Rect rect = new Rect(0.0, 0.0, _border_viewport.ActualWidth, _border_viewport.ActualHeight);
+            //    if (_location.Y > _scrollViewer.GetScrollPosition() && _location.Y < _scrollViewer.GetScrollPosition() + _border_viewport.ActualHeight)
+            //    {
+            //        if (_innerBorder.Visibility == Visibility.Hidden)
+            //        {
+            //            _innerBorder.Visibility = Visibility.Visible;
+            //        }
+            //    }
+            //    else
+            //    {
+            //        if (_innerBorder.Visibility == Visibility.Visible)
+            //        {
+            //            _innerBorder.Visibility = Visibility.Hidden;
+            //        }
+            //    }
+            //}
+        }
+    }
+}