Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / WinForms / Managed / System / WinForms / HtmlShim.cs / 1 / 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. //------------------------------------------------------------------------------ // // 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
- DataSvcMapFileSerializer.cs
- UInt16.cs
- Stack.cs
- PathStreamGeometryContext.cs
- WebBrowserPermission.cs
- XmlSchemaType.cs
- TypeDescriptionProviderAttribute.cs
- FileNameEditor.cs
- RolePrincipal.cs
- ScriptReferenceEventArgs.cs
- WebSysDefaultValueAttribute.cs
- AstNode.cs
- ObjectItemAssemblyLoader.cs
- SamlAssertion.cs
- RectangleConverter.cs
- Int32Rect.cs
- _FixedSizeReader.cs
- ImageCodecInfoPrivate.cs
- QualifiedCellIdBoolean.cs
- ListSortDescriptionCollection.cs
- PermissionToken.cs
- CodePageEncoding.cs
- GatewayDefinition.cs
- FormViewUpdateEventArgs.cs
- MULTI_QI.cs
- XmlDataDocument.cs
- XmlStreamNodeWriter.cs
- ChannelTracker.cs
- MSAAEventDispatcher.cs
- DefaultPrintController.cs
- XmlBoundElement.cs
- TemplateBamlTreeBuilder.cs
- IpcClientChannel.cs
- ElementFactory.cs
- PropertyPushdownHelper.cs
- HyperlinkAutomationPeer.cs
- ListViewGroupCollectionEditor.cs
- EntitySqlQueryState.cs
- PrintControllerWithStatusDialog.cs
- WebEventTraceProvider.cs
- _NegotiateClient.cs
- CompilerResults.cs
- EmptyReadOnlyDictionaryInternal.cs
- RijndaelManaged.cs
- SiteMapProvider.cs
- AutomationAttributeInfo.cs
- XmlWrappingWriter.cs
- HttpServerProtocol.cs
- DesignerLabelAdapter.cs
- DataObject.cs
- SiteIdentityPermission.cs
- FormatControl.cs
- LicenseManager.cs
- BroadcastEventHelper.cs
- HttpRawResponse.cs
- X509UI.cs
- CodeAssignStatement.cs
- StyleXamlTreeBuilder.cs
- FixedSOMPageElement.cs
- PageContentAsyncResult.cs
- isolationinterop.cs
- ProxyAttribute.cs
- PassportAuthentication.cs
- ConstrainedDataObject.cs
- ToolStripItemEventArgs.cs
- StreamUpdate.cs
- TextUtf8RawTextWriter.cs
- Pkcs9Attribute.cs
- DynamicResourceExtensionConverter.cs
- RootBrowserWindowProxy.cs
- BulletChrome.cs
- tabpagecollectioneditor.cs
- JsonDeserializer.cs
- ActivityExecutionContext.cs
- OracleDateTime.cs
- PageMediaType.cs
- ToolStripContentPanel.cs
- SafeNativeMethods.cs
- ThrowOnMultipleAssignment.cs
- NoResizeSelectionBorderGlyph.cs
- GatewayIPAddressInformationCollection.cs
- XamlParser.cs
- FileDialogCustomPlacesCollection.cs
- CodeTypeParameterCollection.cs
- GridViewCommandEventArgs.cs
- DataBindingHandlerAttribute.cs
- CustomAttributeBuilder.cs
- Font.cs
- TextHidden.cs
- PrivilegeNotHeldException.cs
- EventSinkHelperWriter.cs
- AppDomainProtocolHandler.cs
- MetaType.cs
- ObjectToken.cs
- IconBitmapDecoder.cs
- XmlChildEnumerator.cs
- OutArgumentConverter.cs
- StyleModeStack.cs
- assemblycache.cs
- XmlCustomFormatter.cs