Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / MediaContextNotificationWindow.cs / 1 / MediaContextNotificationWindow.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // A wrapper for a top-level hidden window that is used to process // messages broadcasted to top-level windows only (such as DWM's // WM_DWMCOMPOSITIONCHANGED). If the WPF application doesn't have // a top-level window (as it is the case for XBAP applications), // such messages would have been ignored. // //----------------------------------------------------------------------------- using System; using System.Windows.Threading; using System.Collections; using System.Diagnostics; using System.Windows.Media.Animation; using System.Windows.Media.Composition; using Microsoft.Win32; using Microsoft.Internal; using MS.Internal; using MS.Win32; using System.Security; using System.Security.Permissions; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods.MilCoreApi; using SafeNativeMethods=MS.Win32.PresentationCore.SafeNativeMethods; namespace System.Windows.Media { ////// The MediaContextNotificationWindow structure provides its owner /// MediaContext with the ability to receive and forward window /// messages broadcasted to top-level windows. /// internal struct MediaContextNotificationWindow { //+--------------------------------------------------------------------- // // Internal Methods // //--------------------------------------------------------------------- #region Internal Methods ////// Sets the owner MediaContext and creates the notification window. /// ////// Critical - Creates an HwndWrapper and adds a hook. /// TreatAsSafe: The _hwndNotification window is critical and this function is safe to call /// [SecurityCritical, SecurityTreatAsSafe] internal void CreateNotificationWindow(MediaContext ownerMediaContext) { // Remember the pointer to the owner MediaContext that we'll forward the broadcasts to. _ownerMediaContext = ownerMediaContext; // Create a top-level, invisible window so we can get the WM_DWMCOMPOSITIONCHANGED // and other DWM notifications that are broadcasted to top-level windows only. HwndWrapper hwndNotification; hwndNotification = new HwndWrapper(0, NativeMethods.WS_POPUP, 0, 0, 0, 0, 0, "MediaContextNotificationWindow", IntPtr.Zero, null); _hwndNotificationHook = new HwndWrapperHook(MessageFilter); _hwndNotification = new SecurityCriticalDataClass(hwndNotification); _hwndNotification.Value.AddHook(_hwndNotificationHook); } /// /// Critical - Calls dispose on the critical hwnd wrapper. /// TreatAsSafe: It is safe to dispose the wrapper /// [SecurityCritical, SecurityTreatAsSafe] internal void DisposeNotificationWindow() { if (_hwndNotification != null) _hwndNotification.Value.Dispose(); _hwndNotificationHook = null; _hwndNotification = null; _ownerMediaContext = null; } #endregion Internal Methods //+---------------------------------------------------------------------- // // Private Methods // //--------------------------------------------------------------------- #region Private Methods ////// If any of the interesting broadcast messages is seen, forward them to the owner MediaContext. /// private IntPtr MessageFilter(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { Debug.Assert(_ownerMediaContext != null); if (msg == NativeMethods.WM_DWMCOMPOSITIONCHANGED) { _ownerMediaContext.OnDWMCompositionChanged(); } return IntPtr.Zero; } #endregion Private Methods //+---------------------------------------------------------------------- // // Private Fields // //---------------------------------------------------------------------- #region Private Fields // The owner MediaContext private MediaContext _ownerMediaContext; // A top-level hidden window. private SecurityCriticalDataClass_hwndNotification; // The message filter hook for the top-level hidden window. private HwndWrapperHook _hwndNotificationHook; #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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