Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / MS / Internal / Automation / EventPropertyMap.cs / 1 / EventPropertyMap.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // Accessibility event map classes are used to determine if, and how many // listeners there are for events and property changes. // // History: // 07/23/2003 : BrendanM Ported to WCP // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Windows; using System.Diagnostics; namespace MS.Internal.Automation { // Manages the property map that is used to determine if there are // Automation clients interested in properties. internal class EventPropertyMap { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // static class, private ctor to prevent creation private EventPropertyMap() { } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // Called during queueing of property change events to check if there are any // listeners that are interested in this property. Returns true if there are // else false. This function could be called frequently; it must be fast. internal static bool IsInterestingDP(DependencyProperty dp) { using (_propertyLock.ReadLock) { if (_propertyTable != null && _propertyTable.ContainsKey(dp)) { return true; } } return false; } // Updates the list of DynamicProperties that are currently being listened to. // Called by AccEvent class when certain events are added. // // Returns: true if the event property map was created during this call and // false if the property map was not created during this call. internal static bool AddPropertyNotify(DependencyProperty [] properties) { if (properties == null) return false; bool createdMap = false; using (_propertyLock.WriteLock) { // If it doesn't exist, create the property map (key=dp value=listener count) if (_propertyTable == null) { // Up to 20 properties before resize and // small load factor optimizes for speed _propertyTable = new Hashtable(20, .1f); createdMap = true; } int cDPStart = _propertyTable.Count; // properties is an array of the properties one listener is interested in foreach (DependencyProperty dp in properties) { if (dp == null) continue; int cDP = 0; // If the property is in the table, increment it's count if (_propertyTable.ContainsKey(dp)) { cDP = (int)_propertyTable[dp]; } cDP++; _propertyTable[dp] = cDP; } } return createdMap; } // Updates the list of DynamicProperties that are currently being listened to. // Called by AccEvent class when removing certain events. // Returns: true if the property table is empty after this operation. internal static bool RemovePropertyNotify(DependencyProperty [] properties) { Debug.Assert(properties != null); bool isEmpty = false; using (_propertyLock.WriteLock) { if (_propertyTable != null) { int cDPStart = _propertyTable.Count; // properties is an array of the properties one listener is no longer interested in foreach (DependencyProperty dp in properties) { if (_propertyTable.ContainsKey(dp)) { int cDP = (int)_propertyTable[dp]; // Update or remove the entry based on remaining listeners cDP--; if (cDP > 0) { _propertyTable[dp] = cDP; } else { _propertyTable.Remove(dp); } } } // If there are no more properties in the map then delete it; the idea is if there // are no listeners, don't make the property system do extra work. if (_propertyTable.Count == 0) { _propertyTable = null; } } isEmpty = (_propertyTable == null); } return isEmpty; } #endregion Internal Methods //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields // static class, no instance data... private static ReaderWriterLockWrapper _propertyLock = new ReaderWriterLockWrapper(); private static Hashtable _propertyTable; // key=DP, data=listener count #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // Accessibility event map classes are used to determine if, and how many // listeners there are for events and property changes. // // History: // 07/23/2003 : BrendanM Ported to WCP // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Windows; using System.Diagnostics; namespace MS.Internal.Automation { // Manages the property map that is used to determine if there are // Automation clients interested in properties. internal class EventPropertyMap { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // static class, private ctor to prevent creation private EventPropertyMap() { } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods // Called during queueing of property change events to check if there are any // listeners that are interested in this property. Returns true if there are // else false. This function could be called frequently; it must be fast. internal static bool IsInterestingDP(DependencyProperty dp) { using (_propertyLock.ReadLock) { if (_propertyTable != null && _propertyTable.ContainsKey(dp)) { return true; } } return false; } // Updates the list of DynamicProperties that are currently being listened to. // Called by AccEvent class when certain events are added. // // Returns: true if the event property map was created during this call and // false if the property map was not created during this call. internal static bool AddPropertyNotify(DependencyProperty [] properties) { if (properties == null) return false; bool createdMap = false; using (_propertyLock.WriteLock) { // If it doesn't exist, create the property map (key=dp value=listener count) if (_propertyTable == null) { // Up to 20 properties before resize and // small load factor optimizes for speed _propertyTable = new Hashtable(20, .1f); createdMap = true; } int cDPStart = _propertyTable.Count; // properties is an array of the properties one listener is interested in foreach (DependencyProperty dp in properties) { if (dp == null) continue; int cDP = 0; // If the property is in the table, increment it's count if (_propertyTable.ContainsKey(dp)) { cDP = (int)_propertyTable[dp]; } cDP++; _propertyTable[dp] = cDP; } } return createdMap; } // Updates the list of DynamicProperties that are currently being listened to. // Called by AccEvent class when removing certain events. // Returns: true if the property table is empty after this operation. internal static bool RemovePropertyNotify(DependencyProperty [] properties) { Debug.Assert(properties != null); bool isEmpty = false; using (_propertyLock.WriteLock) { if (_propertyTable != null) { int cDPStart = _propertyTable.Count; // properties is an array of the properties one listener is no longer interested in foreach (DependencyProperty dp in properties) { if (_propertyTable.ContainsKey(dp)) { int cDP = (int)_propertyTable[dp]; // Update or remove the entry based on remaining listeners cDP--; if (cDP > 0) { _propertyTable[dp] = cDP; } else { _propertyTable.Remove(dp); } } } // If there are no more properties in the map then delete it; the idea is if there // are no listeners, don't make the property system do extra work. if (_propertyTable.Count == 0) { _propertyTable = null; } } isEmpty = (_propertyTable == null); } return isEmpty; } #endregion Internal Methods //------------------------------------------------------ // // Private Fields // //------------------------------------------------------ #region Private Fields // static class, no instance data... private static ReaderWriterLockWrapper _propertyLock = new ReaderWriterLockWrapper(); private static Hashtable _propertyTable; // key=DP, data=listener count #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DataGridViewCellCancelEventArgs.cs
- CopyEncoder.cs
- CharAnimationBase.cs
- GetRecipientListRequest.cs
- ConversionContext.cs
- WinCategoryAttribute.cs
- WinFormsComponentEditor.cs
- ServiceAuthorizationBehavior.cs
- ConfigXmlAttribute.cs
- RadioButtonStandardAdapter.cs
- Ipv6Element.cs
- Section.cs
- ClientApiGenerator.cs
- HtmlDocument.cs
- TypeContext.cs
- FormView.cs
- EntityDataSourceValidationException.cs
- WebPartVerbCollection.cs
- MediaCommands.cs
- ToolStripRendererSwitcher.cs
- IntSecurity.cs
- StorageEntityContainerMapping.cs
- XmlSchemaImport.cs
- PrintControllerWithStatusDialog.cs
- ComponentChangedEvent.cs
- MainMenu.cs
- SchemaType.cs
- Misc.cs
- AuthenticationModuleElement.cs
- MemberExpressionHelper.cs
- ObjectSecurity.cs
- ServicePointManager.cs
- FileDialogCustomPlace.cs
- ActiveXMessageFormatter.cs
- bindurihelper.cs
- BindingContext.cs
- RelationshipEndMember.cs
- OverflowException.cs
- ApplicationId.cs
- DefaultTextStore.cs
- WebControlAdapter.cs
- StatusCommandUI.cs
- EventTrigger.cs
- RecognizerBase.cs
- ToolStripPanelCell.cs
- CodeNamespaceCollection.cs
- ValidatorCompatibilityHelper.cs
- SqlUserDefinedAggregateAttribute.cs
- AccessDataSourceView.cs
- FusionWrap.cs
- SoapDocumentServiceAttribute.cs
- SignedXml.cs
- BorderGapMaskConverter.cs
- ArrayTypeMismatchException.cs
- BitmapMetadataEnumerator.cs
- EqualityComparer.cs
- SortKey.cs
- ByteStack.cs
- XmlText.cs
- BlobPersonalizationState.cs
- ReflectionUtil.cs
- Journaling.cs
- xdrvalidator.cs
- errorpatternmatcher.cs
- FamilyTypefaceCollection.cs
- HwndProxyElementProvider.cs
- ResourceProviderFactory.cs
- ModelProperty.cs
- RowToParametersTransformer.cs
- ZipIOZip64EndOfCentralDirectoryBlock.cs
- SignedPkcs7.cs
- HybridDictionary.cs
- GridViewCommandEventArgs.cs
- XmlCodeExporter.cs
- FixedBufferAttribute.cs
- XmlIlGenerator.cs
- WindowsListViewScroll.cs
- EntityDataSourceWrapperPropertyDescriptor.cs
- UserPersonalizationStateInfo.cs
- DesignerTransaction.cs
- CheckBoxPopupAdapter.cs
- RelationshipFixer.cs
- OracleColumn.cs
- HtmlInputPassword.cs
- SqlTypesSchemaImporter.cs
- IndexedEnumerable.cs
- UserControlAutomationPeer.cs
- WorkflowViewElement.cs
- SerialReceived.cs
- CatalogPartChrome.cs
- AccessorTable.cs
- PropertyDescriptorCollection.cs
- FieldDescriptor.cs
- OverflowException.cs
- Component.cs
- ReadOnlyDictionary.cs
- DecimalConstantAttribute.cs
- OleDbRowUpdatingEvent.cs
- ObjectMemberMapping.cs
- SQLSingleStorage.cs