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//---------------------------------------------------------------------------
//
// <copyright file="WindowShowOrOpenTracker.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
//
// 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
}
}
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