Separate version

Net40/HandyControl_Net40/Tools/Helper/VisualHelper.cs

@@ -0,0 +1,30 @@
+using System.Linq;
+using System.Windows;
+using System.Windows.Media;
+
+namespace HandyControl.Tools
+{
+    internal class VisualHelper
+    {
+        public static VisualStateGroup TryGetVisualStateGroup(DependencyObject dependencyObject, string groupName)
+        {
+            var root = GetImplementationRoot(dependencyObject);
+            if (root == null)
+            {
+                return null;
+            }
+
+            return VisualStateManager
+                .GetVisualStateGroups(root)?
+                .OfType<VisualStateGroup>()
+                .FirstOrDefault(group => string.CompareOrdinal(groupName, group.Name) == 0);
+        }
+
+        public static FrameworkElement GetImplementationRoot(DependencyObject dependencyObject)
+        {
+            return 1 == VisualTreeHelper.GetChildrenCount(dependencyObject)
+                ? VisualTreeHelper.GetChild(dependencyObject, 0) as FrameworkElement
+                : null;
+        }
+    }
+}