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Viewing changes to class/Microsoft.SilverlightControls/Controls/Data/src/Extensions.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2009-02-14 12:01:08 UTC
  • Revision ID: james.westby@ubuntu.com-20090214120108-06539vb25vhbd8bn
Tags: upstream-1.0
Import upstream version 1.0

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class/Microsoft.SilverlightControls/Controls/Data/src/Extensions.cs
 
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// Copyright © Microsoft Corporation. 
 
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// This source is subject to the Microsoft Source License for Silverlight Controls (March 2008 Release).
 
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// Please see http://go.microsoft.com/fwlink/?LinkID=111693 for details.
 
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// All other rights reserved. 
 
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using System.Collections.Generic;
 
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using System.Diagnostics; 
 
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namespace System.Windows.Controlsb1
 
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{ 
 
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    internal static class Extensions
 
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    {
 
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        private static Dictionary<DependencyObject, Dictionary<DependencyProperty, bool>> _suspendedHandlers = new Dictionary<DependencyObject, Dictionary<DependencyProperty, bool>>(); 
 
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        public static bool IsHandlerSuspended(this DependencyObject obj, DependencyProperty dependencyProperty)
 
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        { 
 
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            if (_suspendedHandlers.ContainsKey(obj)) 
 
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            {
 
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                return _suspendedHandlers[obj].ContainsKey(dependencyProperty); 
 
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            }
 
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            else
 
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            { 
 
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                return false;
 
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            }
 
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        } 
 
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        public static void SetValueNoCallback(this DependencyObject obj, DependencyProperty property, object value)
 
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        { 
 
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            obj.SuspendHandler(property, true);
 
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            try
 
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            { 
 
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                obj.SetValue(property, value);
 
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            }
 
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            finally 
 
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            { 
 
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                obj.SuspendHandler(property, false);
 
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            } 
 
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        }
 
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        private static void SuspendHandler(this DependencyObject obj, DependencyProperty dependencyProperty, bool suspend)
 
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        {
 
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            if (_suspendedHandlers.ContainsKey(obj)) 
 
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            { 
 
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                Dictionary<DependencyProperty, bool> suspensions = _suspendedHandlers[obj];
 
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                if (suspend)
 
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                {
 
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                    Debug.Assert(!suspensions.ContainsKey(dependencyProperty)); 
 
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                    suspensions[dependencyProperty] = true; // true = dummy value
 
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                }
 
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                else 
 
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                { 
 
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                    Debug.Assert(suspensions.ContainsKey(dependencyProperty));
 
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                    suspensions.Remove(dependencyProperty); 
 
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                }
 
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            }
 
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            else 
 
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            {
 
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                Debug.Assert(suspend);
 
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                _suspendedHandlers[obj] = new Dictionary<DependencyProperty, bool>(); 
 
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                _suspendedHandlers[obj][dependencyProperty] = true; 
 
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            }
 
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        } 
 
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    }
 
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}