InvokeProviderWrapper.cs source code in C# .NET

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/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / Automation / InvokeProviderWrapper.cs / 1 / InvokeProviderWrapper.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Invoke pattern provider wrapper for WCP 
//
// History: 
//  07/21/2003 : [....] Ported to WCP
//
//---------------------------------------------------------------------------
 
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/WCP Wrapper class: Implements that UIAutomation I...Provider 
    // interface, and calls through to a WCP 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 InvokeProviderWrapper: MarshalByRefObject, IInvokeProvider
    {
        //-----------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        #region Constructors 

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

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

        #endregion Interface IInvokeProvider 
 

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

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

        #endregion Internal Methods 

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

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

        #endregion Private Methods

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

        #region Private Fields

        private AutomationPeer _peer; 
        private IInvokeProvider _iface;
 
        #endregion Private Fields 
    }
} 

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

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