ToggleProviderWrapper.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 / ToggleProviderWrapper.cs / 1305600 / ToggleProviderWrapper.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Toggle pattern provider wrapper for WCP 
//
// History: 
//  02/04/2004 : MKarr wrote
//
//---------------------------------------------------------------------------
 
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 ToggleProviderWrapper: MarshalByRefObject, IToggleProvider 
    {
        //-----------------------------------------------------
        //
        //  Constructors 
        //
        //----------------------------------------------------- 
 
        #region Constructors
 
        private ToggleProviderWrapper( AutomationPeer peer, IToggleProvider iface )
        {
            _peer = peer;
            _iface = iface; 
        }
 
        #endregion Constructors 

 
        //------------------------------------------------------
        //
        //  Interface IValueProvider
        // 
        //-----------------------------------------------------
 
        #region Interface IToggleProvider 

        public void Toggle( ) 
        {
            ElementUtil.Invoke( _peer, new DispatcherOperationCallback( ToggleInternal ), null );
        }
 
        public ToggleState ToggleState
        { 
            get 
            {
                return (ToggleState) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetToggleState ), null ); 
            }
        }

        #endregion Interface IToggleProvider 

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

        #region Internal Methods 

        internal static object Wrap( AutomationPeer peer, object iface ) 
        { 
            return new ToggleProviderWrapper( peer, (IToggleProvider) iface );
        } 

        #endregion Internal Methods

        //----------------------------------------------------- 
        //
        //  Private Methods 
        // 
        //------------------------------------------------------
 
        #region Private Methods

        private object ToggleInternal( object unused )
        { 
            _iface.Toggle();
            return null; 
        } 

        private object GetToggleState( object unused ) 
        {
            return _iface.ToggleState;
        }
 
        #endregion Private Methods
 
 
        //-----------------------------------------------------
        // 
        //  Private Fields
        //
        //-----------------------------------------------------
 
        #region Private Fields
 
        private AutomationPeer _peer; 
        private IToggleProvider _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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