Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / 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
- Grant.cs
- XamlUtilities.cs
- ClientFormsAuthenticationCredentials.cs
- DataGridViewCellStyleContentChangedEventArgs.cs
- BaseProcessor.cs
- DataStorage.cs
- PersianCalendar.cs
- StringCollection.cs
- Model3DGroup.cs
- Button.cs
- ToolStripOverflowButton.cs
- EntityDataSourceWrapper.cs
- MemoryRecordBuffer.cs
- ToolboxComponentsCreatedEventArgs.cs
- ListViewCancelEventArgs.cs
- DataRowExtensions.cs
- StylusButton.cs
- FilteredXmlReader.cs
- ISAPIRuntime.cs
- PropertyEmitterBase.cs
- HttpPostedFile.cs
- DataGridToolTip.cs
- SqlDeflator.cs
- PaintValueEventArgs.cs
- RenderDataDrawingContext.cs
- CodeAttributeArgumentCollection.cs
- SqlConnectionManager.cs
- OdbcConnectionString.cs
- HtmlEmptyTagControlBuilder.cs
- PeerReferralPolicy.cs
- DecimalConstantAttribute.cs
- ForEachAction.cs
- QueryCursorEventArgs.cs
- IDReferencePropertyAttribute.cs
- SimpleFieldTemplateFactory.cs
- DataRowView.cs
- XmlMapping.cs
- ServiceConfigurationTraceRecord.cs
- Automation.cs
- Propagator.cs
- StringToken.cs
- FileRecordSequenceHelper.cs
- CommonRemoteMemoryBlock.cs
- PropertyEntry.cs
- ApplyImportsAction.cs
- RegularExpressionValidator.cs
- MetadataHelper.cs
- ContentOperations.cs
- SemanticResultKey.cs
- DataStreamFromComStream.cs
- SqlDataSourceStatusEventArgs.cs
- MarshalByValueComponent.cs
- ScrollProperties.cs
- RoamingStoreFile.cs
- SpoolingTaskBase.cs
- TreeBuilder.cs
- DefaultEventAttribute.cs
- FontSizeConverter.cs
- XamlPointCollectionSerializer.cs
- BitmapCodecInfoInternal.cs
- XmlSchemaGroupRef.cs
- WindowsFormsSectionHandler.cs
- MethodCallTranslator.cs
- DataListItemCollection.cs
- CodeAccessPermission.cs
- ClientType.cs
- AssemblyInfo.cs
- LineSegment.cs
- DomNameTable.cs
- FilteredSchemaElementLookUpTable.cs
- FileSecurity.cs
- storagemappingitemcollection.viewdictionary.cs
- HyperLinkColumn.cs
- ClientSettingsProvider.cs
- DataProtection.cs
- NumberFunctions.cs
- ObjectCache.cs
- TypeTypeConverter.cs
- FormViewInsertEventArgs.cs
- OperationGenerator.cs
- XPathAxisIterator.cs
- UnsafeNativeMethods.cs
- GestureRecognitionResult.cs
- XmlWhitespace.cs
- FormViewCommandEventArgs.cs
- WebConfigurationFileMap.cs
- IgnoreSectionHandler.cs
- LocalizedNameDescriptionPair.cs
- XmlNodeReader.cs
- UdpReplyToBehavior.cs
- __Filters.cs
- PathNode.cs
- CommandBindingCollection.cs
- BitmapEffectGeneralTransform.cs
- DynamicDocumentPaginator.cs
- SqlTriggerContext.cs
- PackagingUtilities.cs
- StylusPointProperties.cs
- MethodInfo.cs
- IdentitySection.cs