MoveSizeWinEventHandler.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 / Documents / MoveSizeWinEventHandler.cs / 1305600 / MoveSizeWinEventHandler.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: MoveSizeWinEventHandler implementation. 
//
// History: 
//  02/04/2005 : yutakas - created.
//
//---------------------------------------------------------------------------
 
using System;
using System.Collections; 
using System.Runtime.InteropServices; 
using System.Security;
using System.Security.Permissions; 
using MS.Win32;
using MS.Internal;

namespace System.Windows.Documents 
{
    internal class MoveSizeWinEventHandler : WinEventHandler 
    { 
        //-----------------------------------------------------
        // 
        //  Constructors
        //
        //-----------------------------------------------------
 
        #region Constructors
 
        // ctor that takes a range of events 
        internal MoveSizeWinEventHandler() : base(NativeMethods.EVENT_SYSTEM_MOVESIZEEND,
                                                  NativeMethods.EVENT_SYSTEM_MOVESIZEEND) 
        {
        }

        #endregion Constructors 

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

        #region Internal Methods
 
        // Register text store that will receive move/sice event.
        internal void RegisterTextStore(TextStore textstore) 
        { 
            if (_arTextStore == null)
            { 
               _arTextStore = new ArrayList(1);
            }

            _arTextStore.Add(textstore); 
        }
 
        // Unregister text store. 
        internal void UnregisterTextStore(TextStore textstore)
        { 
            _arTextStore.Remove(textstore);
        }

        // The callback from WinEvent. 
        /// 
        /// Critical - as this invokes Critical method CriticalSourceHwnd 
        /// TreatAsSafe - as this doesn't expose this information but just calls OnLayoutUpdated on the TextStore. 
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        internal override void WinEventProc(int eventId, IntPtr hwnd)
        {
            Invariant.Assert(eventId == NativeMethods.EVENT_SYSTEM_MOVESIZEEND);
 
            if (_arTextStore != null)
            { 
                for (int i = 0; i < _arTextStore.Count; i++) 
                {
                    bool notified = false; 
                    TextStore textstore = (TextStore)_arTextStore[i];

                    IntPtr hwndTemp = textstore.CriticalSourceWnd;
                    while (hwndTemp != IntPtr.Zero) 
                    {
                        if (hwnd == hwndTemp) 
                        { 
                            // Only when the parent window of the source of this TextStore is
                            // moved or resized, we notfiy to Cicero. 
                            textstore.OnLayoutUpdated();
                            notified = true;
                            break;
                        } 
                        hwndTemp = UnsafeNativeMethods.GetParent(new HandleRef(this, hwndTemp));
                    } 
                    if (!notified) 
                        textstore.MakeLayoutChangeOnGotFocus();
                } 
            }
        }

        #endregion Internal Methods 

        //------------------------------------------------------ 
        // 
        //  Internal Properties
        // 
        //------------------------------------------------------

        #region Internal Properties
 
        // Number of TextStores listening to this event.
        internal int TextStoreCount 
        { 
            get
            { 
                return _arTextStore.Count;
            }
        }
 
        #endregion Internal Properties
 
        //----------------------------------------------------- 
        //
        //  Private Fields 
        //
        //------------------------------------------------------

        #region Private Fields 

        // list of the registered TextStores. 
        private ArrayList _arTextStore; 

        #endregion Private Fields 
    }
}


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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK