SelectionProviderWrapper.cs source code in C# .NET

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Code:

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

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Selection pattern provider wrapper for WCP 
//
// History: 
//  07/21/2003 : [....] Ported to WCP
//
//---------------------------------------------------------------------------
 
using System;
using System.Windows.Threading; 
 
using System.Windows.Media;
using System.Collections; 
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;
using System.ComponentModel; 

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 SelectionProviderWrapper: MarshalByRefObject, ISelectionProvider
    { 
        //-----------------------------------------------------
        // 
        //  Constructors 
        //
        //----------------------------------------------------- 

        #region Constructors

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


        //------------------------------------------------------ 
        //
        //  Interface ISelectionProvider 
        // 
        //-----------------------------------------------------
 
        #region Interface ISelectionProvider

        public IRawElementProviderSimple [] GetSelection()
        { 
            return (IRawElementProviderSimple []) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetSelection ), null );
        } 
 
        public bool CanSelectMultiple
        { 
            get
            {
                return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetCanSelectMultiple ), null );
            } 
        }
 
        public bool IsSelectionRequired 
        {
            get 
            {
                return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetIsSelectionRequired ), null );
            }
        } 

        #endregion Interface ISelectionProvider 
 

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

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

        #endregion Internal Methods 

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

        #region Private Methods
 
        private object GetSelection( object unused )
        { 
            return _iface.GetSelection(); 
        }
 
        private object GetCanSelectMultiple( object unused )
        {
            return _iface.CanSelectMultiple;
        } 

        private object GetIsSelectionRequired( object unused ) 
        { 
            return _iface.IsSelectionRequired;
        } 

        #endregion Private Methods

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

        #region Private Fields

        private AutomationPeer _peer; 
        private ISelectionProvider _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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