Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / Windows / Interop / ComponentDispatcherThread.cs / 1305600 / ComponentDispatcherThread.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using MS.Win32; using System.Globalization; using System.Security; using System.Security.Permissions; using MS.Internal.WindowsBase; namespace System.Windows.Interop { ////// This is a class used to implement per-thread instance of the ComponentDispatcher. /// internal class ComponentDispatcherThread { ////// Returns true if one or more components has gone modal. /// Although once one component is modal a 2nd shouldn't. /// public bool IsThreadModal { get { return (_modalCount > 0); } } ////// Returns "current" message. More exactly the last MSG Raised. /// ////// Critical: This is blocked off as defense in depth to avoid leaking message information /// public MSG CurrentKeyboardMessage { [SecurityCritical] get { return _currentKeyboardMSG; } [SecurityCritical] set { _currentKeyboardMSG = value; } } ////// A component calls this to go modal. Current thread wide only. /// ////// Critical: This is blocked off as defense in depth /// [SecurityCritical] public void PushModal() { _modalCount += 1; if(1 == _modalCount) { if(null != _enterThreadModal) _enterThreadModal(null, EventArgs.Empty); } } ////// A component calls this to end being modal. /// ////// Critical: This is blocked off as defense in depth to avoid tampering with input /// [SecurityCritical] public void PopModal() { _modalCount -= 1; if(0 == _modalCount) { if(null != _leaveThreadModal) _leaveThreadModal(null, EventArgs.Empty); } if(_modalCount < 0) _modalCount = 0; // Throwing is also good } ////// The message loop pumper calls this when it is time to do idle processing. /// ////// Critical: This is blocked off as defense in depth /// [SecurityCritical] public void RaiseIdle() { if(null != _threadIdle) _threadIdle(null, EventArgs.Empty); } ////// The message loop pumper calls this for every keyboard message. /// ////// Critical: This is blocked off as defense in depth to prevent message leakage /// [SecurityCritical] public bool RaiseThreadMessage(ref MSG msg) { bool handled = false; if (null != _threadFilterMessage) _threadFilterMessage(ref msg, ref handled); if (handled) return handled; if (null != _threadPreprocessMessage) _threadPreprocessMessage(ref msg, ref handled); return handled; } ////// Components register delegates with this event to handle /// thread idle processing. /// ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// public event EventHandler ThreadIdle { [SecurityCritical] add { _threadIdle += value; } [SecurityCritical] remove { _threadIdle -= value; } } ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// [method:SecurityCritical] private event EventHandler _threadIdle; ////// Components register delegates with this event to handle /// Keyboard Messages (first chance processing). /// ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// public event ThreadMessageEventHandler ThreadFilterMessage { [SecurityCritical] add { _threadFilterMessage += value; } [SecurityCritical] remove { _threadFilterMessage -= value; } } ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// [method:SecurityCritical] private event ThreadMessageEventHandler _threadFilterMessage; ////// Components register delegates with this event to handle /// Keyboard Messages (second chance processing). /// ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// public event ThreadMessageEventHandler ThreadPreprocessMessage { [SecurityCritical] add { _threadPreprocessMessage += value; } [SecurityCritical] remove { _threadPreprocessMessage -= value; } } ////// Adds the specified handler to the front of the invocation list /// of the PreprocessMessage event. /// /// /// Critical: This is blocked off as defense in depth and is used /// to transmit input related information /// [SecurityCritical] public void AddThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler) { _threadPreprocessMessage = (ThreadMessageEventHandler)Delegate.Combine(handler, _threadPreprocessMessage); } ////// Removes the first occurance of the specified handler from the /// invocation list of the PreprocessMessage event. /// /// /// Critical: This is blocked off as defense in depth and is used /// to transmit input related information /// [SecurityCritical] public void RemoveThreadPreprocessMessageHandlerFirst(ThreadMessageEventHandler handler) { if (_threadPreprocessMessage != null) { ThreadMessageEventHandler newHandler = null; foreach (ThreadMessageEventHandler testHandler in _threadPreprocessMessage.GetInvocationList()) { if (testHandler == handler) { // This is the handler to remove. We should not check // for any more occurances. handler = null; } else { newHandler += testHandler; } } _threadPreprocessMessage = newHandler; } } ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// [method:SecurityCritical] private event ThreadMessageEventHandler _threadPreprocessMessage; ////// Components register delegates with this event to handle /// a component on this thread has "gone modal", when previously none were. /// ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// public event EventHandler EnterThreadModal { [SecurityCritical] add { _enterThreadModal += value; } [SecurityCritical] remove { _enterThreadModal -= value; } } ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// [method:SecurityCritical] private event EventHandler _enterThreadModal; ////// Components register delegates with this event to handle /// all components on this thread are done being modal. /// ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// public event EventHandler LeaveThreadModal { [SecurityCritical] add { _leaveThreadModal += value; } [SecurityCritical] remove { _leaveThreadModal -= value; } } ////// Critical: This is blocked off as defense in depth and is used to transmit input related information /// [method:SecurityCritical] private event EventHandler _leaveThreadModal; private int _modalCount; ////// Critical: This holds the last message that was recieved /// [SecurityCritical] private MSG _currentKeyboardMSG; } } // 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
- SimpleTypeResolver.cs
- SchemaElement.cs
- Menu.cs
- ReadOnlyMetadataCollection.cs
- BitmapEffectGroup.cs
- BitmapEffectRenderDataResource.cs
- IndexerNameAttribute.cs
- Vector3DCollectionConverter.cs
- TableLayoutColumnStyleCollection.cs
- Debug.cs
- ContextConfiguration.cs
- TextPointer.cs
- InkCanvasSelectionAdorner.cs
- ApplicationServiceHelper.cs
- EncoderFallback.cs
- DbConnectionPoolIdentity.cs
- ServiceDescription.cs
- _LocalDataStoreMgr.cs
- XmlToDatasetMap.cs
- WindowsFormsHost.cs
- EmptyImpersonationContext.cs
- SessionIDManager.cs
- IgnoreFileBuildProvider.cs
- WebPartTransformerAttribute.cs
- FontSourceCollection.cs
- IDictionary.cs
- Matrix3DValueSerializer.cs
- InstalledFontCollection.cs
- DataControlFieldHeaderCell.cs
- WebPartChrome.cs
- Matrix3DStack.cs
- PageThemeBuildProvider.cs
- FactoryMaker.cs
- XamlSerializationHelper.cs
- TypeLoadException.cs
- IItemContainerGenerator.cs
- OracleNumber.cs
- ToolStripItemEventArgs.cs
- TextMetrics.cs
- UserPersonalizationStateInfo.cs
- OleDbException.cs
- Content.cs
- ObjectQuery.cs
- TextBlock.cs
- RequiredArgumentAttribute.cs
- StoragePropertyMapping.cs
- WebGetAttribute.cs
- TableItemPattern.cs
- MarkupWriter.cs
- QilSortKey.cs
- ScriptModule.cs
- PageRanges.cs
- ToolboxComponentsCreatingEventArgs.cs
- XmlTextReader.cs
- SocketPermission.cs
- HeaderUtility.cs
- XmlUrlResolver.cs
- StreamGeometry.cs
- TypeFieldSchema.cs
- ProcessManager.cs
- VectorAnimationBase.cs
- ControlEvent.cs
- DrawingImage.cs
- OdbcCommandBuilder.cs
- StringValidator.cs
- Int32CollectionConverter.cs
- NativeMethods.cs
- TransactionFlowBindingElement.cs
- DeviceFiltersSection.cs
- OdbcCommand.cs
- TreeChangeInfo.cs
- ResourceIDHelper.cs
- RangeValuePattern.cs
- UInt64.cs
- TypeValidationEventArgs.cs
- HtmlInputHidden.cs
- StylusOverProperty.cs
- XamlSerializerUtil.cs
- HtmlGenericControl.cs
- SQLGuid.cs
- SqlTrackingQuery.cs
- AddInControllerImpl.cs
- IOException.cs
- AutomationEventArgs.cs
- EncodingTable.cs
- CssTextWriter.cs
- XamlSerializerUtil.cs
- UserMapPath.cs
- BitConverter.cs
- MouseActionValueSerializer.cs
- ComponentResourceKeyConverter.cs
- TypeConverters.cs
- ConfigLoader.cs
- PenThread.cs
- GridViewColumnHeaderAutomationPeer.cs
- EditorZoneAutoFormat.cs
- OleDbRowUpdatedEvent.cs
- ThemeDirectoryCompiler.cs
- DataGridViewSortCompareEventArgs.cs
- HTTP_SERVICE_CONFIG_URLACL_KEY.cs