WindowShowOrOpenTracker.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 / UIAutomation / UIAutomationClient / MS / Internal / Automation / WindowShowOrOpenTracker.cs / 1305600 / WindowShowOrOpenTracker.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Class used to track new UI appearing and make sure any events 
// are propogated to that new UI.
// 
// History:
//  06/17/2003 : BrendanM Ported to WCP
//  11/20/2003 : Micw renamed NewUITracker.cs to WindowShowOrOpenTracker.cs
// 
//---------------------------------------------------------------------------
 
using System; 
using System.Globalization;
using System.Text; 
using System.Windows.Automation;
using System.Diagnostics;
using MS.Win32;
 
namespace MS.Internal.Automation
{ 
    // WindowShowOrOpenTracker - Class used to track new UI appearing and make sure any events 
    // are propogated to that new UI.
    internal delegate void WindowShowOrOpenHandler( IntPtr hwnd, AutomationElement rawEl ); 

    // Class used to track new UI appearing and make sure any events
    // are propogated to that new UI.
    internal class WindowShowOrOpenTracker : WinEventWrap 
    {
        //----------------------------------------------------- 
        // 
        //  Constructors
        // 
        //-----------------------------------------------------

        #region Constructors
 
        internal WindowShowOrOpenTracker(WindowShowOrOpenHandler newUIHandler)
            : base(new int[] 
            {NativeMethods.EventObjectUIFragmentCreate, NativeMethods.EVENT_OBJECT_CREATE, NativeMethods.EVENT_OBJECT_SHOW}) 
        {
            AddCallback(newUIHandler); 
        }

        #endregion Constructors
 

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

        #region Internal Methods
 
        internal override void WinEventProc(int eventId, IntPtr hwnd, int idObject, int idChild, uint eventTime)
        { 
            // ignore any event not pertaining directly to the window 
            if (idObject != UnsafeNativeMethods.OBJID_WINDOW)
                return; 

            // Ignore if this is a bogus hwnd (shouldn't happen)
            if (hwnd == IntPtr.Zero)
                return; 

            NativeMethods.HWND nativeHwnd = NativeMethods.HWND.Cast( hwnd ); 
 
            // Ignore windows that have been destroyed
            if (! SafeNativeMethods.IsWindow( nativeHwnd )) 
                return;

            // Ignore invisible windows (IsWindowVisible takes the hwnd ancestor
            // visibility into account) 
            if (! SafeNativeMethods.IsWindowVisible( nativeHwnd ))
                return; 
 
            if (eventId == NativeMethods.EVENT_OBJECT_CREATE)
            { 
                // Ignore WCP hwnd creates; we get eventId EventObjectUIFragmentCreate for those
                //
                string str = ProxyManager.GetClassName(nativeHwnd);
                if (String.Compare(str, 0, _wcpClassName, 0, _wcpClassName.Length, StringComparison.OrdinalIgnoreCase) == 0) 
                    return;
            } 
 
            AutomationElement rawEl = AutomationElement.FromHandle( hwnd );
 
            // Do the notify.  Note that this handler is used to notify client-side UIAutomation providers of windows
            // being destroyed or hidden.  The delegate called here is itself protected by a lock.  This delegate may
            // call out to proxies but also calls ClientEventManager.RaiseEventInThisClientOnly which properly
            // queues the actual callout to client code. 
            object [] handlers = GetHandlers();
            Debug.Assert(handlers.Length <= 1, "handlers.Length"); 
            if (handlers.Length > 0) 
                ((WindowShowOrOpenHandler)handlers[0])( hwnd, rawEl );
        } 

        #endregion Internal Methods

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

        #region Private Fields

        static readonly string _wcpClassName = "HwndWrapper"; 

        #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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