Init

Src/Xceed.Wpf.Toolkit/PropertyGrid/Implementation/Definitions/DefinitionBase.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.Collections.ObjectModel;
+using System.ComponentModel;
+using Xceed.Wpf.Toolkit.PropertyGrid.Converters;
+using System.Windows;
+using Xceed.Wpf.Toolkit.Core.Utilities;
+using System.Linq.Expressions;
+
+namespace Xceed.Wpf.Toolkit.PropertyGrid
+{
+  public abstract class DefinitionBase : DependencyObject
+  {
+    private bool _isLocked;
+
+    internal bool IsLocked
+    {
+      get { return _isLocked; }
+    }
+
+    internal void ThrowIfLocked<TMember>( Expression<Func<TMember>> propertyExpression )
+    {
+      //In XAML, when using any properties of PropertyDefinition, the error of ThrowIfLocked is always thrown => prevent it !
+      if( DesignerProperties.GetIsInDesignMode( this ) )
+        return;
+
+      if( this.IsLocked )
+      {
+        string propertyName = ReflectionHelper.GetPropertyOrFieldName( propertyExpression );
+        string message = string.Format(
+            @"Cannot modify {0} once the definition has beed added to a collection.",
+            propertyName );
+        throw new InvalidOperationException( message );
+      }
+    }
+
+    internal virtual void Lock()
+    {
+      if( !_isLocked )
+      {
+        _isLocked = true;
+      }
+    }
+  }
+}