VirtualizedItemProviderWrapper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Automation / VirtualizedItemProviderWrapper.cs / 1305600 / VirtualizedItemProviderWrapper.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Virtualized Item pattern provider wrapper for WPF 
//
// History: 
//  10/22/2008 : [....] - created
//
//---------------------------------------------------------------------------
 
using System;
using System.Windows.Threading; 
 
using System.Windows.Media;
using System.Windows.Automation; 
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;

namespace MS.Internal.Automation 
{
    // Automation/WPF Wrapper class: Implements that UIAutomation I...Provider 
    // interface, and calls through to a WPF AutomationPeer which implements the corresponding 
    // I...Provider inteface. Marshalls the call from the RPC thread onto the
    // target AutomationPeer's context. 
    //
    // Class has two major parts to it:
    // * Implementation of the I...Provider, which uses Dispatcher.Invoke
    //   to call a private method (lives in second half of the class) via a delegate, 
    //   if necessary, packages any params into an object param. Return type of Invoke
    //   must be cast from object to appropriate type. 
    // * private methods - one for each interface entry point - which get called back 
    //   on the right context. These call through to the peer that's actually
    //   implenting the I...Provider version of the interface. 
    internal class VirtualizedItemProviderWrapper : MarshalByRefObject, IVirtualizedItemProvider
    {
        //-----------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        #region Constructors 

        private VirtualizedItemProviderWrapper(AutomationPeer peer, IVirtualizedItemProvider iface)
        {
            _peer = peer; 
            _iface = iface;
        } 
 
        #endregion Constructors
 

        //------------------------------------------------------
        //
        //  Interface IVirtualizedItemProvider 
        //
        //----------------------------------------------------- 
 
        #region Interface IVirtualizedItemProvider
 
        public void Realize()
        {
            ElementUtil.Invoke(_peer, new DispatcherOperationCallback(Realize), null);
        } 

        #endregion Interface IVirtualizedItemProvider 
 

        //------------------------------------------------------ 
        //
        //  Internal Methods
        //
        //------------------------------------------------------ 

        #region Internal Methods 
 
        internal static object Wrap(AutomationPeer peer, object iface)
        { 
            return new VirtualizedItemProviderWrapper(peer, (IVirtualizedItemProvider)iface);
        }

        #endregion Internal Methods 

        //----------------------------------------------------- 
        // 
        //  Private Methods
        // 
        //------------------------------------------------------

        #region Private Methods
 
        private object Realize(object unused)
        { 
            _iface.Realize(); 
            return null;
        } 


        #endregion Private Methods
 

        //----------------------------------------------------- 
        // 
        //  Private Fields
        // 
        //-----------------------------------------------------

        #region Private Fields
 
        private AutomationPeer _peer;
        private IVirtualizedItemProvider _iface; 
 
        #endregion Private Fields
    } 

}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK