Implemented some relief for TwineCatalogControl on scrolling changes..

1 files changed, 12 insertions, 6 deletions

diff --git a/Software/Visual_Studio/PPC/Tango.PPC.Common/Controls/TwineCatalogControl.xaml.cs b/Software/Visual_Studio/PPC/Tango.PPC.Common/Controls/TwineCatalogControl.xaml.cs
index 2b376e855..d28bbff72 100644
--- a/Software/Visual_Studio/PPC/Tango.PPC.Common/Controls/TwineCatalogControl.xaml.cs
+++ b/Software/Visual_Studio/PPC/Tango.PPC.Common/Controls/TwineCatalogControl.xaml.cs
@@ -24,6 +24,7 @@ namespace Tango.PPC.Common.Controls
         private Catalog _catalog;
         private bool _loaded;
         private bool _preventChange;
+        private double _lastScrollPosition = 0;
 
         public CatalogItem SelectedItem
         {
@@ -45,14 +46,19 @@ namespace Tango.PPC.Common.Controls
         {
             if (!_preventChange)
             {
-                var group = list.ScrollViewer.GetMostVisibleElementDataContext<CatalogGroup>();
-
-                if (group != null)
+                if (e.Value > _lastScrollPosition + 10 || e.Value < _lastScrollPosition - 10)
                 {
-                    _preventChange = true;
-                    slider.Value = slider.Maximum - _catalog.Groups.IndexOf(group);
-                    _preventChange = false;
+                    var group = list.ScrollViewer.GetMostVisibleElementDataContext<CatalogGroup>();
+
+                    if (group != null)
+                    {
+                        _preventChange = true;
+                        slider.Value = slider.Maximum - _catalog.Groups.IndexOf(group);
+                        _preventChange = false;
+                    }
                 }
+
+                _lastScrollPosition = e.Value;
             }
         }