1 files changed, 73 insertions, 0 deletions
diff --git a/MediaBrowser.UI/Controls/EnhancedScrollViewer.cs b/MediaBrowser.UI/Controls/EnhancedScrollViewer.cs
new file mode 100644
index 000000000..188715e1e
--- /dev/null
+++ b/MediaBrowser.UI/Controls/EnhancedScrollViewer.cs
@@ -0,0 +1,73 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+
+namespace MediaBrowser.UI.Controls
+{
+    /// <summary>
+    /// Provides a ScrollViewer that can be scrolled by dragging the mouse
+    /// </summary>
+    public class EnhancedScrollViewer : ScrollViewer
+    {
+        private Point _scrollTarget;
+        private Point _scrollStartPoint;
+        private Point _scrollStartOffset;
+        private const int PixelsToMoveToBeConsideredScroll = 5;
+        
+        protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
+        {
+            if (IsMouseOver)
+            {
+                // Save starting point, used later when determining how much to scroll.
+                _scrollStartPoint = e.GetPosition(this);
+                _scrollStartOffset.X = HorizontalOffset;
+                _scrollStartOffset.Y = VerticalOffset;
+
+                // Update the cursor if can scroll or not.
+                Cursor = (ExtentWidth > ViewportWidth) ||
+                    (ExtentHeight > ViewportHeight) ?
+                    Cursors.ScrollAll : Cursors.Arrow;
+
+                CaptureMouse();
+            }
+            
+            base.OnPreviewMouseDown(e);
+        }
+
+        protected override void OnPreviewMouseMove(MouseEventArgs e)
+        {
+            if (IsMouseCaptured)
+            {
+                Point currentPoint = e.GetPosition(this);
+
+                // Determine the new amount to scroll.
+                var delta = new Point(_scrollStartPoint.X - currentPoint.X, _scrollStartPoint.Y - currentPoint.Y);
+
+                if (Math.Abs(delta.X) < PixelsToMoveToBeConsideredScroll &&
+                    Math.Abs(delta.Y) < PixelsToMoveToBeConsideredScroll)
+                    return;
+
+                _scrollTarget.X = _scrollStartOffset.X + delta.X;
+                _scrollTarget.Y = _scrollStartOffset.Y + delta.Y;
+
+                // Scroll to the new position.
+                ScrollToHorizontalOffset(_scrollTarget.X);
+                ScrollToVerticalOffset(_scrollTarget.Y);
+            }
+            
+            base.OnPreviewMouseMove(e);
+        }
+
+        protected override void OnPreviewMouseUp(MouseButtonEventArgs e)
+        {
+            if (IsMouseCaptured)
+            {
+                Cursor = Cursors.Arrow;
+                ReleaseMouseCapture();
+            }
+            
+            base.OnPreviewMouseUp(e);
+        }
+    }
+}