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
- EntitySqlQueryState.cs
- prompt.cs
- JoinTreeSlot.cs
- RenderData.cs
- StylusEditingBehavior.cs
- QueryOptionExpression.cs
- DataGridColumnHeaderItemAutomationPeer.cs
- CRYPTPROTECT_PROMPTSTRUCT.cs
- OleDbCommandBuilder.cs
- StylusButtonCollection.cs
- ConnectionManagementElement.cs
- UpdateRecord.cs
- SafeArrayRankMismatchException.cs
- ConsumerConnectionPointCollection.cs
- GenericEnumerator.cs
- InlineCollection.cs
- ListenerUnsafeNativeMethods.cs
- FixedDocumentSequencePaginator.cs
- SpellerHighlightLayer.cs
- CacheModeValueSerializer.cs
- RuleRefElement.cs
- ReceiveContextCollection.cs
- CLSCompliantAttribute.cs
- OrthographicCamera.cs
- TypeListConverter.cs
- EdmToObjectNamespaceMap.cs
- _Rfc2616CacheValidators.cs
- MessagingDescriptionAttribute.cs
- ThumbButtonInfoCollection.cs
- FrameworkElementFactoryMarkupObject.cs
- StatusBarItem.cs
- IconHelper.cs
- Int16AnimationUsingKeyFrames.cs
- RootBuilder.cs
- StackSpiller.Generated.cs
- SymbolUsageManager.cs
- ClipboardProcessor.cs
- PartBasedPackageProperties.cs
- CrossContextChannel.cs
- HttpProfileBase.cs
- WaitForChangedResult.cs
- ControlBindingsCollection.cs
- TextServicesProperty.cs
- AnimationStorage.cs
- SqlConnectionPoolProviderInfo.cs
- MaskedTextBox.cs
- XmlQueryStaticData.cs
- RewritingValidator.cs
- WithParamAction.cs
- BamlRecords.cs
- MatrixConverter.cs
- AuthStoreRoleProvider.cs
- ExtensionWindowResizeGrip.cs
- ExpandCollapseProviderWrapper.cs
- HwndHostAutomationPeer.cs
- TextEditorLists.cs
- NotificationContext.cs
- PrinterUnitConvert.cs
- MultipartIdentifier.cs
- Label.cs
- SamlSecurityTokenAuthenticator.cs
- CodeAttributeDeclaration.cs
- CellQuery.cs
- ScriptIgnoreAttribute.cs
- AssociationTypeEmitter.cs
- SeekStoryboard.cs
- MsmqInputSessionChannel.cs
- SortAction.cs
- PropertyMapper.cs
- DataServiceStreamResponse.cs
- CryptographicAttribute.cs
- RowCache.cs
- XPathDocumentNavigator.cs
- SpecularMaterial.cs
- RuntimeResourceSet.cs
- SqlParameterCollection.cs
- Stroke2.cs
- EntitySetDataBindingList.cs
- ArraySubsetEnumerator.cs
- EntityWithKeyStrategy.cs
- ClockController.cs
- MethodSignatureGenerator.cs
- XmlEntityReference.cs
- ObjectDataSourceSelectingEventArgs.cs
- DiscoveryOperationContextExtension.cs
- FocusTracker.cs
- StackOverflowException.cs
- SqlFormatter.cs
- FeatureSupport.cs
- CultureInfoConverter.cs
- DelegateBodyWriter.cs
- BaseDataListPage.cs
- TypeLibConverter.cs
- TextDataBindingHandler.cs
- CacheEntry.cs
- SimpleMailWebEventProvider.cs
- DBNull.cs
- BitmapMetadataBlob.cs
- ArraySubsetEnumerator.cs
- ComplusEndpointConfigContainer.cs