Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / MS / Internal / Ink / StrokeCollectionDefaultValueFactory.cs / 1 / StrokeCollectionDefaultValueFactory.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: DefaultValueFactory for StrokeCollection // // History: // 2006/01/24 : waynezen - Created // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Controls; using System.Windows.Ink; namespace MS.Internal.Ink { internal class StrokeCollectionDefaultValueFactory : DefaultValueFactory { internal StrokeCollectionDefaultValueFactory() { } ////// Returns an "immutable" default value. Since we can't make the default value /// read only we'll return a new one every time. /// internal override object DefaultValue { get { return new StrokeCollection(); } } ////// Creates a mutable default value /// internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { Debug.Assert(property.PropertyType == typeof(StrokeCollection), string.Format(System.Globalization.CultureInfo.InvariantCulture, "The DependencyProperty {0} has to be type of StrokeCollection.", property)); // Instantiate our default value instance. StrokeCollection defaultValue = new StrokeCollection(); // Add event handlers for tracking the changes on the default value instance. StrokeCollectionDefaultPromoter promoter = new StrokeCollectionDefaultPromoter(owner, property); defaultValue.StrokesChanged += new StrokeCollectionChangedEventHandler(promoter.OnStrokeCollectionChanged); defaultValue.PropertyDataChanged += new PropertyDataChangedEventHandler(promoter.OnStrokeCollectionChanged ); return defaultValue; } /// /// A tracking class which monitors any changes on StrokeCollection /// private class StrokeCollectionDefaultPromoter { ////// Constructor /// /// /// internal StrokeCollectionDefaultPromoter(DependencyObject owner, DependencyProperty property) { _owner = owner; _dependencyProperty = property; } ////// A handler for both AttributeChanged and PropertyDataChanged. /// /// /// internal void OnStrokeCollectionChanged(object sender, TEventArgs e) { StrokeCollection value = (StrokeCollection)sender; // The current instance will be promoted to the local value other than the default value. // Then we could just remove our handlers to stop tracking. value.StrokesChanged -= new StrokeCollectionChangedEventHandler(OnStrokeCollectionChanged ); value.PropertyDataChanged -= new PropertyDataChangedEventHandler(OnStrokeCollectionChanged ); // NTRAID#WINDOWS-1334059-2005/10/17-waynezen, // We only promote the value when there is no local value set yet. if ( _owner.ReadLocalValue(_dependencyProperty) == DependencyProperty.UnsetValue ) { // Promote the instance to the local value. _owner.SetValue(_dependencyProperty, value); } // Remove this value from the DefaultValue cache so we stop // handing it out as the default value now that it has changed. PropertyMetadata metadata = _dependencyProperty.GetMetadata(_owner.DependencyObjectType); metadata.ClearCachedDefaultValue(_owner, _dependencyProperty); } private readonly DependencyObject _owner; private readonly DependencyProperty _dependencyProperty; } } } // 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: DefaultValueFactory for StrokeCollection // // History: // 2006/01/24 : waynezen - Created // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Controls; using System.Windows.Ink; namespace MS.Internal.Ink { internal class StrokeCollectionDefaultValueFactory : DefaultValueFactory { internal StrokeCollectionDefaultValueFactory() { } ////// Returns an "immutable" default value. Since we can't make the default value /// read only we'll return a new one every time. /// internal override object DefaultValue { get { return new StrokeCollection(); } } ////// Creates a mutable default value /// internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { Debug.Assert(property.PropertyType == typeof(StrokeCollection), string.Format(System.Globalization.CultureInfo.InvariantCulture, "The DependencyProperty {0} has to be type of StrokeCollection.", property)); // Instantiate our default value instance. StrokeCollection defaultValue = new StrokeCollection(); // Add event handlers for tracking the changes on the default value instance. StrokeCollectionDefaultPromoter promoter = new StrokeCollectionDefaultPromoter(owner, property); defaultValue.StrokesChanged += new StrokeCollectionChangedEventHandler(promoter.OnStrokeCollectionChanged); defaultValue.PropertyDataChanged += new PropertyDataChangedEventHandler(promoter.OnStrokeCollectionChanged ); return defaultValue; } /// /// A tracking class which monitors any changes on StrokeCollection /// private class StrokeCollectionDefaultPromoter { ////// Constructor /// /// /// internal StrokeCollectionDefaultPromoter(DependencyObject owner, DependencyProperty property) { _owner = owner; _dependencyProperty = property; } ////// A handler for both AttributeChanged and PropertyDataChanged. /// /// /// internal void OnStrokeCollectionChanged(object sender, TEventArgs e) { StrokeCollection value = (StrokeCollection)sender; // The current instance will be promoted to the local value other than the default value. // Then we could just remove our handlers to stop tracking. value.StrokesChanged -= new StrokeCollectionChangedEventHandler(OnStrokeCollectionChanged ); value.PropertyDataChanged -= new PropertyDataChangedEventHandler(OnStrokeCollectionChanged ); // NTRAID#WINDOWS-1334059-2005/10/17-waynezen, // We only promote the value when there is no local value set yet. if ( _owner.ReadLocalValue(_dependencyProperty) == DependencyProperty.UnsetValue ) { // Promote the instance to the local value. _owner.SetValue(_dependencyProperty, value); } // Remove this value from the DefaultValue cache so we stop // handing it out as the default value now that it has changed. PropertyMetadata metadata = _dependencyProperty.GetMetadata(_owner.DependencyObjectType); metadata.ClearCachedDefaultValue(_owner, _dependencyProperty); } private readonly DependencyObject _owner; private readonly DependencyProperty _dependencyProperty; } } } // 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
- JpegBitmapDecoder.cs
- Size.cs
- ModelVisual3D.cs
- DataSourceXmlTextReader.cs
- TraceContext.cs
- GatewayDefinition.cs
- SplitterEvent.cs
- DesignBindingPropertyDescriptor.cs
- CompilerParameters.cs
- ColorConvertedBitmap.cs
- StorageEntitySetMapping.cs
- AVElementHelper.cs
- EdmSchemaError.cs
- TextBlockAutomationPeer.cs
- LinkArea.cs
- DataTableTypeConverter.cs
- Util.cs
- ReadOnlyHierarchicalDataSourceView.cs
- SqlProcedureAttribute.cs
- ToolStripRenderEventArgs.cs
- WebPartHeaderCloseVerb.cs
- ProfileServiceManager.cs
- SplitterDesigner.cs
- URLIdentityPermission.cs
- ExtenderProvidedPropertyAttribute.cs
- ButtonFlatAdapter.cs
- KeyboardEventArgs.cs
- UnmanagedMemoryStream.cs
- ParallelRangeManager.cs
- SoapElementAttribute.cs
- unsafeIndexingFilterStream.cs
- SymLanguageType.cs
- AutoGeneratedField.cs
- MobileUserControl.cs
- ReadOnlyPropertyMetadata.cs
- Substitution.cs
- ParameterToken.cs
- PathFigure.cs
- TransformerInfo.cs
- NumberFormatter.cs
- FileLoadException.cs
- TitleStyle.cs
- RecordManager.cs
- AdapterDictionary.cs
- OleDbConnectionInternal.cs
- HttpResponseHeader.cs
- SubpageParagraph.cs
- TypeDescriptor.cs
- BrowserCapabilitiesFactory.cs
- XmlEncApr2001.cs
- GlyphTypeface.cs
- ClientBuildManagerCallback.cs
- EndpointBehaviorElement.cs
- MessageLoggingElement.cs
- HwndKeyboardInputProvider.cs
- RowToParametersTransformer.cs
- PageBuildProvider.cs
- DateTime.cs
- EditorZoneBase.cs
- InvalidateEvent.cs
- Menu.cs
- HyperLinkColumn.cs
- DataGridViewHitTestInfo.cs
- ProcessHostFactoryHelper.cs
- Internal.cs
- DefaultValueTypeConverter.cs
- XamlTreeBuilderBamlRecordWriter.cs
- WebBrowserDocumentCompletedEventHandler.cs
- CodeExpressionStatement.cs
- FamilyCollection.cs
- _SafeNetHandles.cs
- RequestTimeoutManager.cs
- PropertyPathWorker.cs
- DiffuseMaterial.cs
- _KerberosClient.cs
- MemberPath.cs
- HttpRequest.cs
- DispatcherTimer.cs
- XmlAttribute.cs
- SubclassTypeValidatorAttribute.cs
- MdImport.cs
- ThumbButtonInfo.cs
- TypeConverterAttribute.cs
- ModelChangedEventArgsImpl.cs
- ECDsa.cs
- WindowsSecurityTokenAuthenticator.cs
- CellParaClient.cs
- ToolStripItemRenderEventArgs.cs
- DivideByZeroException.cs
- DateTimeOffsetConverter.cs
- BaseCAMarshaler.cs
- ObjectDataSourceSelectingEventArgs.cs
- ServiceModelTimeSpanValidator.cs
- XmlSchemaType.cs
- DesignerOptionService.cs
- EntitySet.cs
- UrlRoutingHandler.cs
- RequestTimeoutManager.cs
- ControlBuilder.cs
- CapabilitiesRule.cs