RangeValueProviderWrapper.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / Automation / RangeValueProviderWrapper.cs / 1 / RangeValueProviderWrapper.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Range Value 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 RangeValueProviderWrapper: MarshalByRefObject, IRangeValueProvider
    {
        //-----------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        #region Constructors 

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

        //------------------------------------------------------
        //
        //  Interface IRangeValueProvider 
        //
        //----------------------------------------------------- 
 
        #region Interface IRangeValueProvider
 
        public void SetValue( double val )
        {
            ElementUtil.Invoke( _peer, new DispatcherOperationCallback( SetValueInternal ), val );
        } 

        public double Value 
        { 
            get
            { 
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetValue ), null );
            }
        }
 
        public bool IsReadOnly
        { 
            get 
            {
                return (bool) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetIsReadOnly ), null ); 
            }
        }

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

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

        public double LargeChange
        {
            get 
            {
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetLargeChange ), null ); 
            } 
        }
 
        public double SmallChange
        {
            get
            { 
                return (double) ElementUtil.Invoke( _peer, new DispatcherOperationCallback( GetSmallChange ), null );
            } 
        } 

        #endregion Interface IRangeValueProvider 


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

        #region Internal Methods 

        internal static object Wrap( AutomationPeer peer, object iface )
        {
            return new RangeValueProviderWrapper( peer, (IRangeValueProvider) iface ); 
        }
 
        #endregion Internal Methods 

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

        #region Private Methods 
 
        private object SetValueInternal( object arg )
        { 
            _iface.SetValue( (double)arg );
            return null;
        }
 
        private object GetValue( object unused )
        { 
            return _iface.Value; 
        }
 
        private object GetIsReadOnly( object unused )
        {
            return _iface.IsReadOnly;
        } 

        private object GetMaximum( object unused ) 
        { 
            return _iface.Maximum;
        } 

        private object GetMinimum( object unused )
        {
            return _iface.Minimum; 
        }
 
        private object GetLargeChange( object unused ) 
        {
            return _iface.LargeChange; 
        }

        private object GetSmallChange( object unused )
        { 
            return _iface.SmallChange;
        } 
 
        #endregion Private Methods
 

        //-----------------------------------------------------
        //
        //  Private Fields 
        //
        //----------------------------------------------------- 
 
        #region Private Fields
 
        private AutomationPeer _peer;
        private IRangeValueProvider _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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