Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / Windows / Interop / ComponentDispatcher.cs / 1 / ComponentDispatcher.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.Threading; using System.Diagnostics.CodeAnalysis; using System.Security; using System.Security.Permissions; using MS.Internal; using MS.Win32; using MS.Internal.WindowsBase; namespace System.Windows.Interop { ////// This is the delegate used for registering with the /// ThreadFilterMessage and ThreadPreprocessMessage Events. /// [SuppressMessage("Microsoft.Design", "CA1045:DoNotPassTypesByReference")] public delegate void ThreadMessageEventHandler(ref MSG msg, ref bool handled); ////// This is a static class used to share control of the message pump. /// Whomever is pumping (i.e. calling GetMessage()) will also send /// the messages to RaiseThreadKeyMessage() which will dispatch them to /// the ThreadFilterMessage and then (if not handled) to the ThreadPreprocessMessage /// delegates. That way everyone can be included in the message loop. /// Currently only Keyboard messages are supported. /// There are also Events for Idle and facilities for Thread-Modal operation. /// public static class ComponentDispatcher { static ComponentDispatcher() { _threadSlot = Thread.AllocateDataSlot(); } private static ComponentDispatcherThread CurrentThreadData { get { ComponentDispatcherThread data; object obj = Thread.GetData(_threadSlot); if(null == obj) { data = new ComponentDispatcherThread(); Thread.SetData(_threadSlot, data); } else { data = (ComponentDispatcherThread) obj; } return data; } } // Properties ////// Returns true if one or more components has gone modal. /// Although once one component is modal a 2nd shouldn't. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// public static bool IsThreadModal { [SecurityCritical] get { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcherThread data = ComponentDispatcher.CurrentThreadData; return data.IsThreadModal; } } ////// Returns "current" message. More exactly the last MSG Raised. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// public static MSG CurrentKeyboardMessage { [SecurityCritical] get { SecurityHelper.DemandUnrestrictedUIPermission(); return ComponentDispatcher.CurrentThreadData.CurrentKeyboardMessage; } } ////// Returns "current" message. More exactly the last MSG Raised. /// ////// Critical: This is blocked off as defense in depth /// internal static MSG UnsecureCurrentKeyboardMessage { [FriendAccessAllowed] // Built into Base, used by Core or Framework. [SecurityCritical] get { return ComponentDispatcher.CurrentThreadData.CurrentKeyboardMessage; } [FriendAccessAllowed] // Built into Base, used by Core or Framework. [SecurityCritical] set { ComponentDispatcher.CurrentThreadData.CurrentKeyboardMessage = value; } } // Methods ////// A component calls this to go modal. Current thread wide only. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// [SecurityCritical] public static void PushModal() { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcherThread data = ComponentDispatcher.CurrentThreadData; data.PushModal(); } ////// A component calls this to end being modal. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// [SecurityCritical] public static void PopModal() { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcherThread data = ComponentDispatcher.CurrentThreadData; data.PopModal(); } ////// The message loop pumper calls this when it is time to do idle processing. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// [SecurityCritical] [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] [SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate")] public static void RaiseIdle() { ComponentDispatcherThread data = ComponentDispatcher.CurrentThreadData; data.RaiseIdle(); } ////// The message loop pumper calls this for every keyboard message. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// [SecurityCritical] [SuppressMessage("Microsoft.Design", "CA1030:UseEventsWhereAppropriate")] [SuppressMessage("Microsoft.Design", "CA1045:DoNotPassTypesByReference")] [UIPermissionAttribute(SecurityAction.LinkDemand, Unrestricted = true)] public static bool RaiseThreadMessage(ref MSG msg) { ComponentDispatcherThread data = ComponentDispatcher.CurrentThreadData; return data.RaiseThreadMessage(ref msg); } // Events ////// Components register delegates with this event to handle /// thread idle processing. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// public static event EventHandler ThreadIdle { [SecurityCritical] add { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.ThreadIdle += value; } [SecurityCritical] remove { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.ThreadIdle -= value; } } ////// Components register delegates with this event to handle /// Keyboard Messages (first chance processing). /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// [SuppressMessage("Microsoft.Design", "CA1009:DeclareEventHandlersCorrectly")] public static event ThreadMessageEventHandler ThreadFilterMessage { [SecurityCritical] add { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.ThreadFilterMessage += value; } [SecurityCritical] remove { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.ThreadFilterMessage -= value; } } ////// Components register delegates with this event to handle /// Keyboard Messages (second chance processing). /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth The /// only reason the code for add has a link demand is to /// enable a test scenario for secure.exe. /// PublicOk: There is a demand here /// [SuppressMessage("Microsoft.Design", "CA1009:DeclareEventHandlersCorrectly")] public static event ThreadMessageEventHandler ThreadPreprocessMessage { [UIPermissionAttribute(SecurityAction.LinkDemand, Unrestricted = true)] [SecurityCritical] add { ComponentDispatcher.CurrentThreadData.ThreadPreprocessMessage += value; } [SecurityCritical] remove { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.ThreadPreprocessMessage -= value; } } ////// Components register delegates with this event to handle /// a component on this thread has "gone modal", when previously none were. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// public static event EventHandler EnterThreadModal { [SecurityCritical] add { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.EnterThreadModal += value; } [SecurityCritical] remove { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.EnterThreadModal -= value; } } ////// Components register delegates with this event to handle /// all components on this thread are done being modal. /// ////// Callers must have UIPermission(PermissionState.Unrestricted) to call this API. /// ////// Critical: This is blocked off as defense in depth /// PublicOk: There is a demand here /// public static event EventHandler LeaveThreadModal { [SecurityCritical] add { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.LeaveThreadModal += value; } [SecurityCritical] remove { SecurityHelper.DemandUnrestrictedUIPermission(); ComponentDispatcher.CurrentThreadData.LeaveThreadModal -= value; } } // member data private static System.LocalDataStoreSlot _threadSlot; } }; // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SqlUtils.cs
- XPathNavigatorKeyComparer.cs
- CodeTypeDeclarationCollection.cs
- XPathSelectionIterator.cs
- TdsRecordBufferSetter.cs
- Avt.cs
- StrongName.cs
- QilChoice.cs
- UnsafeNativeMethods.cs
- MultiPropertyDescriptorGridEntry.cs
- SoapIgnoreAttribute.cs
- PageThemeParser.cs
- PageTheme.cs
- ColorBlend.cs
- RequestTimeoutManager.cs
- ImageFormat.cs
- ModelChangedEventArgsImpl.cs
- InteropBitmapSource.cs
- ipaddressinformationcollection.cs
- HttpStreams.cs
- ComponentCache.cs
- ValidationHelper.cs
- SqlInternalConnectionSmi.cs
- Boolean.cs
- DataGridViewRow.cs
- DataSourceHelper.cs
- LabelAutomationPeer.cs
- OpenFileDialog.cs
- WorkItem.cs
- HebrewNumber.cs
- ExceptionUtil.cs
- DrawingState.cs
- HwndSubclass.cs
- MetadataArtifactLoader.cs
- NameObjectCollectionBase.cs
- Zone.cs
- DataGridViewColumnDesigner.cs
- HttpListenerContext.cs
- CodeVariableDeclarationStatement.cs
- SecurityTokenSerializer.cs
- DoubleAnimation.cs
- PeekCompletedEventArgs.cs
- HandlerMappingMemo.cs
- DesignTimeXamlWriter.cs
- CodeNamespaceImportCollection.cs
- LinqDataSourceDeleteEventArgs.cs
- XDRSchema.cs
- SqlDataSourceQueryEditor.cs
- ManipulationVelocities.cs
- XmlCharCheckingWriter.cs
- Timeline.cs
- GeneratedView.cs
- SiteMapPath.cs
- NamedElement.cs
- RootDesignerSerializerAttribute.cs
- WmlValidatorAdapter.cs
- DataColumn.cs
- SchemaNotation.cs
- NumberFormatter.cs
- DetailsViewPageEventArgs.cs
- DependencyPropertyValueSerializer.cs
- UnknownWrapper.cs
- QilName.cs
- CloseSequence.cs
- SqlExpressionNullability.cs
- MergeExecutor.cs
- QilPatternFactory.cs
- Ipv6Element.cs
- Quaternion.cs
- KeyEventArgs.cs
- SoapAttributes.cs
- ActiveXHost.cs
- StylusButtonCollection.cs
- WsdlInspector.cs
- AttachedPropertyBrowsableForTypeAttribute.cs
- RegexCapture.cs
- BamlReader.cs
- ValueConversionAttribute.cs
- ClonableStack.cs
- XPathNodeIterator.cs
- GeneralTransform3DTo2D.cs
- BaseServiceProvider.cs
- BufferedOutputAsyncStream.cs
- UserPreferenceChangedEventArgs.cs
- CultureInfo.cs
- DSASignatureDeformatter.cs
- CookieProtection.cs
- FixedFindEngine.cs
- HttpInputStream.cs
- TransformGroup.cs
- DocumentPageView.cs
- MultitargetUtil.cs
- HyperLink.cs
- RecognizedWordUnit.cs
- RuntimeCompatibilityAttribute.cs
- ParameterDataSourceExpression.cs
- XmlCodeExporter.cs
- Roles.cs
- WebPartZoneBase.cs
- MatrixAnimationBase.cs