Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / Automation / ToggleProviderWrapper.cs / 1 / ToggleProviderWrapper.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Toggle pattern provider wrapper for WCP // // History: // 02/04/2004 : [....] 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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