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
- IdentityValidationException.cs
- HostingEnvironmentSection.cs
- VisualStateGroup.cs
- XmlQuerySequence.cs
- EventMappingSettings.cs
- ClientSideProviderDescription.cs
- SessionStateSection.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- _LocalDataStore.cs
- DataBindingHandlerAttribute.cs
- AnchoredBlock.cs
- FacetEnabledSchemaElement.cs
- CheckBoxBaseAdapter.cs
- KeyManager.cs
- ImageDrawing.cs
- TypedRowGenerator.cs
- MouseEventArgs.cs
- BaseConfigurationRecord.cs
- XmlWrappingReader.cs
- Pair.cs
- DataConnectionHelper.cs
- GroupBox.cs
- PeerConnector.cs
- SchemaMapping.cs
- UIPropertyMetadata.cs
- TableItemStyle.cs
- TreeViewImageIndexConverter.cs
- Themes.cs
- BrowserInteropHelper.cs
- EnumBuilder.cs
- XmlCompatibilityReader.cs
- PrimitiveCodeDomSerializer.cs
- LoginDesigner.cs
- ClientTarget.cs
- ObfuscationAttribute.cs
- RenderDataDrawingContext.cs
- ProgressChangedEventArgs.cs
- Int32AnimationUsingKeyFrames.cs
- Image.cs
- BinaryUtilClasses.cs
- Activity.cs
- ExpressionVisitor.cs
- CodeAccessSecurityEngine.cs
- EdmError.cs
- Sql8ExpressionRewriter.cs
- WebPartTransformerAttribute.cs
- PagerSettings.cs
- ObjectHandle.cs
- XmlReader.cs
- LaxModeSecurityHeaderElementInferenceEngine.cs
- CheckBoxPopupAdapter.cs
- DataPagerCommandEventArgs.cs
- EntitySetRetriever.cs
- GridViewEditEventArgs.cs
- Privilege.cs
- CodeArrayIndexerExpression.cs
- DataGridViewButtonColumn.cs
- TagPrefixCollection.cs
- ProcessStartInfo.cs
- xml.cs
- Parser.cs
- UdpDiscoveryEndpoint.cs
- LocalizationParserHooks.cs
- PropertyGeneratedEventArgs.cs
- XamlBrushSerializer.cs
- ColorEditor.cs
- Opcode.cs
- QilTargetType.cs
- HttpServerProtocol.cs
- WebMessageEncodingBindingElement.cs
- ShapingEngine.cs
- ZoneButton.cs
- ThrowHelper.cs
- SystemGatewayIPAddressInformation.cs
- X509Certificate.cs
- EntityDataSourceViewSchema.cs
- DataGridCellsPresenter.cs
- ComboBox.cs
- DataGridViewEditingControlShowingEventArgs.cs
- UnsafeNativeMethodsCLR.cs
- WebScriptEnablingBehavior.cs
- FrameworkElement.cs
- ListSortDescriptionCollection.cs
- HuffModule.cs
- FunctionDefinition.cs
- MetafileHeaderWmf.cs
- CodeDomComponentSerializationService.cs
- InProcStateClientManager.cs
- LoadedOrUnloadedOperation.cs
- TextSpanModifier.cs
- MatrixStack.cs
- SubqueryRules.cs
- HitTestParameters.cs
- InkCanvasSelectionAdorner.cs
- NativeMethods.cs
- XmlKeywords.cs
- ObjectContext.cs
- validation.cs
- ParentUndoUnit.cs
- IdentifierCollection.cs