Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / 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. // // // 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DataViewManagerListItemTypeDescriptor.cs
- SpecialFolderEnumConverter.cs
- StdValidatorsAndConverters.cs
- StylusTip.cs
- XmlTextReaderImplHelpers.cs
- CompressStream.cs
- CookieHandler.cs
- GenericIdentity.cs
- DiffuseMaterial.cs
- HtmlTable.cs
- _NTAuthentication.cs
- AdapterDictionary.cs
- WindowsStreamSecurityUpgradeProvider.cs
- SkewTransform.cs
- ClientConvert.cs
- DesignerTransactionCloseEvent.cs
- ComAdminInterfaces.cs
- SecurityDescriptor.cs
- InvokeGenerator.cs
- UserNameSecurityTokenAuthenticator.cs
- IndexerReference.cs
- Scene3D.cs
- SmiConnection.cs
- SingleSelectRootGridEntry.cs
- StatusBarPanel.cs
- OutputCacheProfile.cs
- RelationshipConstraintValidator.cs
- controlskin.cs
- BuilderInfo.cs
- EventLogEntryCollection.cs
- PeerCollaboration.cs
- OutputCacheSettings.cs
- AttributeProviderAttribute.cs
- Brush.cs
- DBSchemaTable.cs
- ClosureBinding.cs
- Misc.cs
- CryptoConfig.cs
- KeySpline.cs
- MatrixAnimationBase.cs
- PathTooLongException.cs
- Point4DValueSerializer.cs
- MimeFormatExtensions.cs
- CodeAttributeArgument.cs
- DefaultTraceListener.cs
- ByteStack.cs
- DataColumnSelectionConverter.cs
- ImportedNamespaceContextItem.cs
- XmlNamedNodeMap.cs
- XmlSerializer.cs
- CryptoApi.cs
- ReferenceEqualityComparer.cs
- GridItem.cs
- Panel.cs
- WebPartMinimizeVerb.cs
- BrushValueSerializer.cs
- CustomSignedXml.cs
- PeerApplication.cs
- Typography.cs
- PagedControl.cs
- BorderGapMaskConverter.cs
- DataBindingHandlerAttribute.cs
- ProvideValueServiceProvider.cs
- WCFBuildProvider.cs
- BitSet.cs
- MarshalDirectiveException.cs
- SqlParameterCollection.cs
- AdjustableArrowCap.cs
- PagesChangedEventArgs.cs
- TextEffectResolver.cs
- SecurityPermission.cs
- EpmContentDeSerializer.cs
- Selection.cs
- BCryptHashAlgorithm.cs
- GB18030Encoding.cs
- SecuritySessionSecurityTokenProvider.cs
- ProtocolsSection.cs
- DocumentCollection.cs
- InvokePattern.cs
- ProxyWebPart.cs
- CLRBindingWorker.cs
- JulianCalendar.cs
- SystemThemeKey.cs
- RegularExpressionValidator.cs
- Trace.cs
- ExpressionVisitor.cs
- AutoCompleteStringCollection.cs
- DesignBindingEditor.cs
- SqlConnectionPoolGroupProviderInfo.cs
- ColorAnimation.cs
- HttpServerVarsCollection.cs
- Decoder.cs
- ActivationArguments.cs
- PerformanceCountersElement.cs
- SyndicationSerializer.cs
- SmiRequestExecutor.cs
- AsyncOperation.cs
- DocumentApplication.cs
- FragmentQueryProcessor.cs
- NativeActivityTransactionContext.cs