ScrollProviderWrapper.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / Automation / ScrollProviderWrapper.cs / 1 / ScrollProviderWrapper.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Scroll pattern provider wrapper for WCP 
//
// History: 
//  07/21/2003 : [....] Ported to WCP
//
//---------------------------------------------------------------------------
 
using System;
using System.Windows.Threading; 
 
using System.Windows;
using System.Windows.Media; 
using System.Windows.Automation;
using System.Windows.Automation.Provider;
using System.Windows.Automation.Peers;
using MS.Internal.Automation; 

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 ScrollProviderWrapper: MarshalByRefObject, IScrollProvider 
    {
        //----------------------------------------------------- 
        // 
        //  Constructors
        // 
        //-----------------------------------------------------

        #region Constructors
 
        private ScrollProviderWrapper( AutomationPeer peer, IScrollProvider iface )
        { 
            _peer = peer; 
            _iface = iface;
        } 

        #endregion Constructors

 
        //------------------------------------------------------
        // 
        //  Interface IScrollProvider 
        //
        //----------------------------------------------------- 

        #region Interface IScrollProvider

        public void Scroll( ScrollAmount horizontalAmount, ScrollAmount verticalAmount ) 
        {
            ElementUtil.Invoke( _peer, new DispatcherOperationCallback( Scroll ), new ScrollAmount [ ] { horizontalAmount, verticalAmount } ); 
        } 

        public void SetScrollPercent( double horizontalPercent, double verticalPercent ) 
        {
            ElementUtil.Invoke( _peer, new DispatcherOperationCallback( SetScrollPercent ), new double [ ] { horizontalPercent, verticalPercent } );
        }
 
        public double HorizontalScrollPercent
        { 
            get 
            {
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetHorizontalScrollPercent ), null ); 
            }
        }

        public double VerticalScrollPercent 
        {
            get 
            { 
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetVerticalScrollPercent ), null );
            } 
        }

        public double HorizontalViewSize
        { 
            get
            { 
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetHorizontalViewSize ), null ); 
            }
        } 

        public double VerticalViewSize
        {
            get 
            {
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetVerticalViewSize ), null ); 
            } 
        }
 
        public bool HorizontallyScrollable
        {
            get
            { 
                return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetHorizontallyScrollable ), null );
            } 
        } 

        public bool VerticallyScrollable 
        {
            get
            {
                return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetVerticallyScrollable ), null ); 
            }
        } 
 
        #endregion Interface IScrollProvider
 

        //------------------------------------------------------
        //
        //  Internal Methods 
        //
        //------------------------------------------------------ 
 
        #region Internal Methods
 
        internal static object Wrap( AutomationPeer peer, object iface )
        {
            return new ScrollProviderWrapper( peer, (IScrollProvider) iface );
        } 

        #endregion Internal Methods 
 
        //-----------------------------------------------------
        // 
        //  Private Methods
        //
        //------------------------------------------------------
 
        #region Private Methods
 
        private object Scroll( object arg ) 
        {
            ScrollAmount [ ] args = (ScrollAmount [ ]) arg; 
            _iface.Scroll( args[ 0 ], args[ 1 ] );
            return null;
        }
 
        private object SetScrollPercent( object arg )
        { 
            double [ ] args = (double [ ]) arg; 
            _iface.SetScrollPercent( args[ 0 ], args[ 1 ] );
            return null; 
        }

        private object GetHorizontalScrollPercent( object unused )
        { 
            return _iface.HorizontalScrollPercent;
        } 
 
        private object GetVerticalScrollPercent( object unused )
        { 
            return _iface.VerticalScrollPercent;
        }

        private object GetHorizontalViewSize( object unused ) 
        {
            return _iface.HorizontalViewSize; 
        } 

        private object GetVerticalViewSize( object unused ) 
        {
            return _iface.VerticalViewSize;
        }
 
        private object GetHorizontallyScrollable( object unused )
        { 
            return _iface.HorizontallyScrollable; 
        }
 
        private object GetVerticallyScrollable( object unused )
        {
            return _iface.VerticallyScrollable;
        } 

        #endregion Private Methods 
 

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

        #region Private Fields 
 
        private AutomationPeer _peer;
        private IScrollProvider _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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