Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / UIAutomationClient / MS / Internal / Automation / WindowHideOrCloseTracker.cs / 1 / WindowHideOrCloseTracker.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: // 11/20/2003 : [....] Created // //--------------------------------------------------------------------------- using System; using System.Text; using System.Windows.Automation; using MS.Win32; using System.Diagnostics; namespace MS.Internal.Automation { // WindowHideOrCloseTracker - Class used to track new UI appearing and make sure any events // are propogated to that new UI. internal delegate void WindowHideOrCloseHandler( IntPtr hwnd, AutomationElement rawEl, int[] runtimeId ); // Class used to track new UI appearing and make sure any events // are propogated to that new UI. internal class WindowHideOrCloseTracker : WinEventWrap { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors internal WindowHideOrCloseTracker(WindowHideOrCloseHandler newUIHandler) : base(new int[] {NativeMethods.EVENT_OBJECT_DESTROY, NativeMethods.EVENT_OBJECT_HIDE}) { 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 ); // Purposefully including windows that have been destroyed (e.g. IsWindow will return // false here for EVENT_OBJECT_DESTROY) because we need that notification. if (eventId == NativeMethods.EVENT_OBJECT_HIDE && !SafeNativeMethods.IsWindow( nativeHwnd )) { return; } int[] runtimeId; AutomationElement rawEl; if (eventId == NativeMethods.EVENT_OBJECT_DESTROY) { // If the window has been destroyed just report the RuntimeId with the event. runtimeId = HwndProxyElementProvider.MakeRuntimeId( nativeHwnd ); rawEl = null; } else { // If the window is just being hidden then can create (and return as event src) a real element rawEl = AutomationElement.FromHandle( hwnd ); runtimeId = rawEl.GetRuntimeId(); } // 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 ) ( (WindowHideOrCloseHandler)handlers [0] )( hwnd, rawEl, runtimeId ); } #endregion Internal Methods //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields // no state #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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