WindowInteropHelper.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 / Framework / System / Windows / Interop / WindowInteropHelper.cs / 1305600 / WindowInteropHelper.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// File: WindowInteropHelper.cs
//
// Description: Implements Avalon WindowInteropHelper classes, which helps 
//              interop b/w legacy and Avalon Window.
// 
// Created: 05/06/03 
//
// Copyright (C) 2001 by Microsoft Corporation.  All rights reserved. 
//
//---------------------------------------------------------------------------

using System; 
using System.Windows;
using System.Windows.Interop; 
using System.Security; 
using System.Security.Permissions;
using System.Diagnostics; 
using MS.Internal;
using MS.Win32;

namespace System.Windows.Interop 
{
    #region class WindowInteropHelper 
    ///  
    /// Implements Avalon WindowInteropHelper classes, which helps
    /// interop b/w legacy and Avalon Window. 
    /// 
    public sealed class WindowInteropHelper
    {
 
        //---------------------------------------------------
        // 
        // Constructors 
        //
        //--------------------------------------------------- 
        #region Constructors

        /// 
        /// 
        /// 
        ///  
        public WindowInteropHelper(Window window) 
        {
            if (window == null) 
                throw new ArgumentNullException("window");
            _window = window;
        }
 
        #endregion Constructors
 
 
        //----------------------------------------------------
        // 
        // Public Properties
        //
        //---------------------------------------------------
        #region Public Properties 

        ///  
        /// Get the Handle of the window 
        /// 
        ///  
        ///     Callers must have UIPermission(UIPermissionWindow.AllWindows) to call this API.
        /// 
        /// 
        ///   Critical: Exposes a handle 
        ///   PublicOK: There is a demand , this API not available in internet zone
        ///  
        public IntPtr Handle 
        {
            [SecurityCritical] 
            get
            {
                SecurityHelper.DemandUIWindowPermission();
                return CriticalHandle; 
            }
        } 
 
        /// 
        ///   Critical: Exposes a handle 
        /// 
        internal IntPtr CriticalHandle
        {
            [SecurityCritical] 
            get
            { 
                Invariant.Assert(_window != null, "Cannot be null since we verify in the constructor"); 
                return _window.CriticalHandle;
            } 
        }

        /// 
        /// Get/Set the Owner handle of the window 
        /// 
        ///  
        ///     Callers must have UIPermission(UIPermissionWindow.AllWindows) to call this API. 
        /// 
        ///  
        ///   Critical: Exposes a handle
        ///   PublicOK: There is a demand , this API not available in internet zone
        /// 
        public IntPtr Owner 
        {
            [SecurityCritical] 
            get 
            {
                SecurityHelper.DemandUIWindowPermission(); 
                Debug.Assert(_window != null, "Cannot be null since we verify in the constructor");
                return _window.OwnerHandle;
            }
            [SecurityCritical] 
            set
            { 
                SecurityHelper.DemandUIWindowPermission(); 
                Debug.Assert(_window != null, "Cannot be null since we verify in the constructor");
                // error checking done in Window 
                _window.OwnerHandle = value;
            }
        }
 
        #endregion Public Properties
 
        //---------------------------------------------------- 
        //
        // Public Methods 
        //
        //----------------------------------------------------
        #region Public Methods
 
        /// 
        /// Create the hwnd of the Window if the hwnd is not created yet. 
        ///  
        /// 
        ///   Critical: Create and exposes the window handle. 
        ///   PublicOK: We demand UIPermission.
        /// 
        [SecurityCritical]
        public IntPtr EnsureHandle() 
        {
            SecurityHelper.DemandUIWindowPermission(); 
 
            if (CriticalHandle == IntPtr.Zero)
            { 
                _window.CreateSourceWindow(false /*create hwnd during show*/);
            }

            return CriticalHandle; 
        }
 
        #endregion Public Methods 

        //---------------------------------------------- 
        //
        // Private Fields
        //
        //---------------------------------------------- 
        #region Private Fields
 
        private Window      _window; 

        #endregion Private Members 
    }
    #endregion class WindowInteropHelper
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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