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
- MimeXmlReflector.cs
- DataRelation.cs
- SerializationObjectManager.cs
- _StreamFramer.cs
- SqlServer2KCompatibilityAnnotation.cs
- PtsHelper.cs
- ItemsControl.cs
- MetadataPropertyCollection.cs
- PersonalizationEntry.cs
- XmlDictionaryWriter.cs
- HwndPanningFeedback.cs
- DateBoldEvent.cs
- ToolStripComboBox.cs
- SymDocumentType.cs
- ListManagerBindingsCollection.cs
- SQLDecimal.cs
- SemanticKeyElement.cs
- webproxy.cs
- AutoCompleteStringCollection.cs
- MiniCustomAttributeInfo.cs
- SignatureDescription.cs
- PolyBezierSegmentFigureLogic.cs
- TypeSystem.cs
- Rect3D.cs
- BitmapSource.cs
- Underline.cs
- TemplateBaseAction.cs
- CheckPair.cs
- WebScriptMetadataFormatter.cs
- ComponentChangedEvent.cs
- WebHttpSecurityElement.cs
- DataGridLinkButton.cs
- SqlRecordBuffer.cs
- FolderNameEditor.cs
- MetaModel.cs
- Queue.cs
- HwndKeyboardInputProvider.cs
- __Filters.cs
- HotSpot.cs
- FaultFormatter.cs
- XmlParserContext.cs
- IntSecurity.cs
- XmlSubtreeReader.cs
- versioninfo.cs
- ScopedKnownTypes.cs
- XmlAnyElementAttributes.cs
- ThousandthOfEmRealDoubles.cs
- FigureParagraph.cs
- Internal.cs
- AstTree.cs
- TranslateTransform.cs
- CollectionViewGroup.cs
- DictionaryKeyPropertyAttribute.cs
- DesignerProperties.cs
- UriSection.cs
- HashMembershipCondition.cs
- MultiBindingExpression.cs
- SessionSymmetricMessageSecurityProtocolFactory.cs
- TimerEventSubscription.cs
- FileIOPermission.cs
- CommandDevice.cs
- isolationinterop.cs
- EntityViewContainer.cs
- DbDataRecord.cs
- XmlSchemaNotation.cs
- TraceXPathNavigator.cs
- ByteStreamGeometryContext.cs
- GroupDescription.cs
- Separator.cs
- ScriptControl.cs
- RuntimeArgumentHandle.cs
- WeakReferenceEnumerator.cs
- CodeGenerator.cs
- SqlProviderUtilities.cs
- PermissionSet.cs
- PopOutPanel.cs
- ReplacementText.cs
- HtmlShim.cs
- HiddenField.cs
- SrgsRule.cs
- BaseCodeDomTreeGenerator.cs
- DataBoundControlHelper.cs
- ElapsedEventArgs.cs
- columnmapkeybuilder.cs
- FileDialogCustomPlacesCollection.cs
- TempEnvironment.cs
- Rect.cs
- TimeSpanStorage.cs
- xml.cs
- SystemFonts.cs
- RotateTransform3D.cs
- ExpressionBuilder.cs
- MenuItemStyle.cs
- RegexMatch.cs
- Thumb.cs
- MultiAsyncResult.cs
- EmissiveMaterial.cs
- DetailsViewDeletedEventArgs.cs
- ColorKeyFrameCollection.cs
- HttpHeaderCollection.cs