Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / HtmlShim.cs / 1305376 / HtmlShim.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; /// This is essentially a proxy object between the native /// html objects and our managed ones. We want the managed /// HtmlDocument, HtmlWindow and HtmlElement to be super-lightweight, /// which means that we shouldnt have things that tie up their lifetimes /// contained within them. The "Shim" is essentially the object that /// manages events coming out of the HtmlDocument, HtmlElement and HtmlWindow /// and serves them back up to the user. internal abstract class HtmlShim : IDisposable { private EventHandlerList events; private int eventCount = 0; private DictionaryattachedEventList; protected HtmlShim() { } ~HtmlShim() { Dispose(false); } private EventHandlerList Events { get { if (events == null) { events = new EventHandlerList(); } return events; } } /// Support IHtml*3.AttachHandler public abstract void AttachEventHandler(string eventName, EventHandler eventHandler); public void AddHandler(object key, Delegate value) { eventCount++; Events.AddHandler(key, value); OnEventHandlerAdded(); } protected HtmlToClrEventProxy AddEventProxy(string eventName, EventHandler eventHandler) { if (attachedEventList == null) { attachedEventList = new Dictionary (); } HtmlToClrEventProxy proxy = new HtmlToClrEventProxy(this, eventName, eventHandler); attachedEventList[eventHandler] = proxy; return proxy; } public abstract UnsafeNativeMethods.IHTMLWindow2 AssociatedWindow { get; } /// create connectionpoint cookie public abstract void ConnectToEvents(); /// Support IHtml*3.DetachEventHandler public abstract void DetachEventHandler(string eventName, EventHandler eventHandler); /// disconnect from connectionpoint cookie /// inheriting classes should override to disconnect from ConnectionPoint and call base. public virtual void DisconnectFromEvents() { if (attachedEventList != null) { EventHandler[] events = new EventHandler[attachedEventList.Count]; attachedEventList.Keys.CopyTo(events,0); foreach (EventHandler eh in events) { HtmlToClrEventProxy proxy = attachedEventList[eh]; DetachEventHandler(proxy.EventName, eh); } } } /// return the sender for events, usually the HtmlWindow, HtmlElement, HtmlDocument protected abstract object GetEventSender(); public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { if (disposing) { DisconnectFromEvents(); if (this.events != null) { this.events.Dispose(); this.events = null; } } } public void FireEvent(object key, EventArgs e) { System.Delegate delegateToInvoke = (System.Delegate)Events[key]; if (delegateToInvoke != null) { try { delegateToInvoke.DynamicInvoke(GetEventSender(), e); } catch (Exception ex) { // Note: this check is for the debugger, so we can catch exceptions in the debugger instead of // throwing a thread exception. if (NativeWindow.WndProcShouldBeDebuggable) { throw; } else { Application.OnThreadException(ex); } } } } protected virtual void OnEventHandlerAdded() { ConnectToEvents(); } protected virtual void OnEventHandlerRemoved() { if (eventCount <=0) { DisconnectFromEvents(); eventCount = 0; } } public void RemoveHandler(object key, Delegate value) { eventCount--; Events.RemoveHandler(key, value); OnEventHandlerRemoved(); } protected HtmlToClrEventProxy RemoveEventProxy(EventHandler eventHandler) { if (attachedEventList == null) { return null; } if (attachedEventList.ContainsKey(eventHandler)) { HtmlToClrEventProxy proxy = attachedEventList[eventHandler] as HtmlToClrEventProxy; attachedEventList.Remove(eventHandler); return proxy; } return null; } } } // 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
- ComponentResourceKeyConverter.cs
- unsafeIndexingFilterStream.cs
- Int16.cs
- Compiler.cs
- SiteMapDataSource.cs
- Stackframe.cs
- HttpModuleActionCollection.cs
- ContextMenuAutomationPeer.cs
- StorageConditionPropertyMapping.cs
- ReverseQueryOperator.cs
- VersionPair.cs
- XslAstAnalyzer.cs
- ConfigXmlAttribute.cs
- ConsumerConnectionPointCollection.cs
- Control.cs
- RichTextBox.cs
- ServicePointManager.cs
- cache.cs
- RecognizedAudio.cs
- ToolStripDropDownItem.cs
- controlskin.cs
- EqualityComparer.cs
- InvalidDocumentContentsException.cs
- ToolStripDesigner.cs
- TimeSpanConverter.cs
- LocationReferenceEnvironment.cs
- AngleUtil.cs
- DataRelationCollection.cs
- HttpServerUtilityWrapper.cs
- HTMLTextWriter.cs
- FixedPageProcessor.cs
- ContextMarshalException.cs
- WindowsStatusBar.cs
- ReceiveErrorHandling.cs
- PageCatalogPart.cs
- ImportCatalogPart.cs
- SchemaImporter.cs
- DBConcurrencyException.cs
- DesignOnlyAttribute.cs
- SubpageParaClient.cs
- MergeLocalizationDirectives.cs
- Page.cs
- WebPartDisplayMode.cs
- Types.cs
- Vertex.cs
- XmlValidatingReaderImpl.cs
- DateTimeSerializationSection.cs
- SpeechRecognizer.cs
- PrivilegedConfigurationManager.cs
- RuntimeHandles.cs
- BinaryMethodMessage.cs
- ResourceReferenceExpression.cs
- AuthenticationServiceManager.cs
- MissingFieldException.cs
- FormViewUpdateEventArgs.cs
- ScrollChrome.cs
- _BufferOffsetSize.cs
- DivideByZeroException.cs
- TypeForwardedToAttribute.cs
- ComponentChangingEvent.cs
- InstancePersistenceCommand.cs
- ProxyDataContractResolver.cs
- AsyncStreamReader.cs
- SafeRegistryKey.cs
- EventSourceCreationData.cs
- GenericTextProperties.cs
- ToolStripContainer.cs
- CustomActivityDesigner.cs
- VirtualPathUtility.cs
- DataTrigger.cs
- GeometryValueSerializer.cs
- handlecollector.cs
- CodeComment.cs
- Function.cs
- TranslateTransform3D.cs
- AnnotationResourceCollection.cs
- CompensateDesigner.cs
- TemplateBaseAction.cs
- SvcMapFileSerializer.cs
- SqlClientMetaDataCollectionNames.cs
- BitmapInitialize.cs
- DataGridViewCell.cs
- FormViewUpdateEventArgs.cs
- SHA256Cng.cs
- UseLicense.cs
- TemplateAction.cs
- RunClient.cs
- SchemaMapping.cs
- DataTableMappingCollection.cs
- XmlCodeExporter.cs
- Function.cs
- BoundConstants.cs
- MergeLocalizationDirectives.cs
- DataGridViewRowHeightInfoPushedEventArgs.cs
- PartialTrustVisibleAssembliesSection.cs
- StringFreezingAttribute.cs
- ExpressionBuilder.cs
- ArrayEditor.cs
- URLEditor.cs
- TypeValidationEventArgs.cs