Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / UIAutomation / Win32Providers / MS / Internal / AutomationProxies / MSAAWinEventWrap.cs / 1305600 / MSAAWinEventWrap.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Lightweight class to wrap Win32 WinEvents. // // THIS IS VIRTUALLY AN IDENTICAL COPY TO A FILE OF THE SAME NAME IN UIAUTOMATION! // IF YOU FIX A using System; using System.Collections; using System.Runtime.InteropServices; using MS.Win32; namespace MS.Internal.AutomationProxies { // Lightweight class to wrap Win32 WinEvents. Users of this class would // inherit from MSAAWinEventWrap do the following: // 1. Call the base constructor with a params array of event identifiers // 2. Override WinEventProc to provide an implementation. internal class MSAAWinEventWrap { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // ctor that takes a range of events internal MSAAWinEventWrap(int eventMin, int eventMax) { _eventMin = eventMin; _eventMax = eventMax; _hHooks = new IntPtr[1]; Init(); } ~MSAAWinEventWrap() { Clear(); } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods internal virtual void WinEventProc(int eventId, IntPtr hwnd, int idObject, int idChild) { // override this to provide an implementation } internal void Clear() { StopListening(); lock(this) { _clientCallbacks.Clear (); } if (_gchThis.IsAllocated) { _gchThis.Free(); } } internal void StartListening() { _fBusy = true; { // in a single hook, listen for a range of WinEvent types _hHooks[0] = Misc.SetWinEventHook(_eventMin, _eventMax, IntPtr.Zero, _winEventProc, 0, 0, _fFlags); if (_hHooks[0] == IntPtr.Zero) { StopListening(); } } _fBusy = false; } internal void StopListening() { // ASSUMPTION: Before StopListening is called, all callback delegates have been removed // so that any events received while hooks are being removed become noops (since there's // no handlers for them to call). _fBusy = true; for (int i=0;i<_hHooks.Length;i++) { if (_hHooks[i] != IntPtr.Zero) { Misc.UnhookWinEvent(_hHooks[i]); _hHooks[i] = IntPtr.Zero; } } if (_qEvents != null) { _qEvents.Clear(); } _fBusy = false; } #endregion Internal Methods //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods // queue winevents so that the get processed in the order we receive them. If we just // dispatch them as we get them, we'll end up getting some _while_ we are processing others, // and end up completing those events out of order, making the event order appear backwards. // This code checks whether we are currently processing an event, and if so, queues it so that // we process it when we're done with the current event. private void WinEventReentrancyFilter(int winEventHook, int eventId, IntPtr hwnd, int idObject, int idChild, int eventThread, uint eventTime) { if (_fBusy) { _qEvents.Enqueue(new WinEvent(eventId, hwnd, idObject, idChild)); } else { _fBusy = true; try { WinEventProc( eventId, hwnd, idObject, idChild ); // deliver this event } catch (Exception e) { if (Misc.IsCriticalException(e)) { throw; } // ignore exceptions for now since we've no way to let clients add exception handlers } while (_qEvents.Count > 0) { WinEvent winEvent = (WinEvent)_qEvents.Dequeue(); // process queued events try { WinEventProc(winEvent._eventId, winEvent._hwnd, winEvent._idObject, winEvent._idChild); } catch (Exception e) { if (Misc.IsCriticalException(e)) { throw; } // ignore exceptions for now since we've no way to let clients add exception handlers } } _fBusy = false; } } private void Init() { // Keep the garbage collector from moving things around _winEventProc = new NativeMethods.WinEventProcDef(WinEventReentrancyFilter); _gchThis = GCHandle.Alloc(_winEventProc); _clientCallbacks = new ArrayList(2); _qEvents = new Queue(16, (float)2.0); // (initial cap, growth factor) _fFlags = NativeMethods.WINEVENT_OUTOFCONTEXT; } #endregion Private Methods #region Internal Types // ----------------------------------------------------- // // Internal Types Declaration // // ------------------------------------------------------ // Function call to either the Start or Stop Listener internal delegate void StartStopDelegate(); #endregion Internal Types //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private Fields private class WinEvent { internal WinEvent(int eventId, IntPtr hwnd, int idObject, int idChild) { _eventId = eventId; _hwnd = hwnd; _idObject = idObject; _idChild = idChild; } public int _eventId; public IntPtr _hwnd; public int _idObject; public int _idChild; } private Queue _qEvents; // Queue of events waiting to be processed private int _eventMin; // minimum WinEvent type in range private int _eventMax; // maximium WinEventType in range private IntPtr [] _hHooks; // the returned handles(s) from SetWinEventHook private bool _fBusy; // Flag indicating if we're busy processing private int _fFlags; // SetWinEventHook flags private GCHandle _gchThis; // GCHandle to keep GCs from moving this callback private NativeMethods.WinEventProcDef _winEventProc; // the callback handed to USER for WinEvents protected ArrayList _clientCallbacks; // the client callback interface objects #endregion Private Fields } } // 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
- XamlClipboardData.cs
- URLMembershipCondition.cs
- AsyncResult.cs
- SiteOfOriginPart.cs
- DataTableExtensions.cs
- DataStorage.cs
- UInt16Converter.cs
- SystemIcons.cs
- XmlILStorageConverter.cs
- DragDrop.cs
- MediaPlayerState.cs
- Error.cs
- TraceSwitch.cs
- OutputCacheSettingsSection.cs
- Rotation3DAnimationBase.cs
- StateDesignerConnector.cs
- CurrencyWrapper.cs
- DeferredRunTextReference.cs
- ModelPropertyCollectionImpl.cs
- Vector3DAnimationUsingKeyFrames.cs
- StatusBar.cs
- Registry.cs
- QueryCursorEventArgs.cs
- CodeTypeReferenceCollection.cs
- PathGeometry.cs
- FormClosedEvent.cs
- ThrowHelper.cs
- WindowsSysHeader.cs
- InputManager.cs
- DynamicScriptObject.cs
- LingerOption.cs
- HashCodeCombiner.cs
- BasicKeyConstraint.cs
- ToolStripItemEventArgs.cs
- SortDescriptionCollection.cs
- _TLSstream.cs
- FileSystemInfo.cs
- RSAPKCS1KeyExchangeFormatter.cs
- ParameterModifier.cs
- ProxyWebPart.cs
- SimpleNameService.cs
- DocumentReferenceCollection.cs
- EncryptedType.cs
- AsyncStreamReader.cs
- WinFormsSpinner.cs
- WebRequest.cs
- ComplexPropertyEntry.cs
- IteratorDescriptor.cs
- ResourceDisplayNameAttribute.cs
- XmlValueConverter.cs
- ProjectedWrapper.cs
- ToolStripSplitButton.cs
- TextOnlyOutput.cs
- TraceLevelStore.cs
- MetadataSerializer.cs
- RawTextInputReport.cs
- SignedXml.cs
- AsymmetricSignatureFormatter.cs
- RichTextBoxConstants.cs
- Journaling.cs
- ListDictionary.cs
- SubMenuStyle.cs
- SqlDataSourceSelectingEventArgs.cs
- DataGridViewColumnTypePicker.cs
- ClientRuntimeConfig.cs
- FormViewCommandEventArgs.cs
- SamlAuthorityBinding.cs
- ScriptReferenceEventArgs.cs
- SelectionProviderWrapper.cs
- FormatConvertedBitmap.cs
- MouseCaptureWithinProperty.cs
- MethodBuilderInstantiation.cs
- MatrixConverter.cs
- Mutex.cs
- AppDomainEvidenceFactory.cs
- BackgroundFormatInfo.cs
- SystemKeyConverter.cs
- SHA256Managed.cs
- MasterPageCodeDomTreeGenerator.cs
- BufferedGraphics.cs
- WeakRefEnumerator.cs
- SettingsBase.cs
- JapaneseCalendar.cs
- MenuItem.cs
- CaseStatement.cs
- EmissiveMaterial.cs
- SafeRightsManagementQueryHandle.cs
- PageCodeDomTreeGenerator.cs
- NativeObjectSecurity.cs
- MailMessage.cs
- ProvidePropertyAttribute.cs
- QueryStringParameter.cs
- DirectoryRootQuery.cs
- Vector3D.cs
- OLEDB_Enum.cs
- PointLight.cs
- AutoGeneratedFieldProperties.cs
- SiteMapHierarchicalDataSourceView.cs
- _Events.cs
- ResponseBodyWriter.cs