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Src/Xceed.Wpf.Toolkit/PropertyGrid/Implementation/Definitions/EditorDefinitionBase.cs

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+/*************************************************************************************
+
+   Extended WPF Toolkit
+
+   Copyright (C) 2007-2013 Xceed Software Inc.
+
+   This program is provided to you under the terms of the Microsoft Public
+   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 
+
+   For more features, controls, and fast professional support,
+   pick up the Plus Edition at http://xceed.com/wpf_toolkit
+
+   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
+
+  ***********************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Collections;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Data;
+
+namespace Xceed.Wpf.Toolkit.PropertyGrid
+{
+  public abstract class EditorDefinitionBase : PropertyDefinitionBase
+  {
+
+    internal EditorDefinitionBase() { }
+
+    internal FrameworkElement GenerateEditingElementInternal( PropertyItemBase propertyItem ) 
+    {
+      return this.GenerateEditingElement( propertyItem );
+    }
+
+    protected virtual FrameworkElement GenerateEditingElement( PropertyItemBase propertyItem ) { return null; }
+
+    internal void UpdateProperty( FrameworkElement element, DependencyProperty elementProp, DependencyProperty definitionProperty )
+    {
+      object currentValue = this.GetValue( definitionProperty );
+      object localValue = this.ReadLocalValue( definitionProperty );
+      object elementValue = element.GetValue( elementProp );
+      bool areEquals = false;
+
+      // Avoid setting values if it does not affect anything 
+      // because setting a local value may prevent a style setter from being active.
+      if( localValue != DependencyProperty.UnsetValue )
+      {
+        if( ( elementValue != null ) && ( currentValue != null ) )
+        {
+          areEquals = ( elementValue.GetType().IsValueType && currentValue.GetType().IsValueType )
+                      ? elementValue.Equals( currentValue )  // Value Types
+                      : currentValue == element.GetValue( elementProp ); // Reference Types
+        }
+
+        if( !areEquals )
+        {
+          element.SetValue( elementProp, currentValue );
+        }
+        else
+        {
+          element.ClearValue( elementProp );
+        }
+      }
+    }
+  }
+}