Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Ink / DrawingAttributesDefaultValueFactory.cs / 1305600 / DrawingAttributesDefaultValueFactory.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: DefaultValueFactory for DrawingAttributes // // History: // 2005/11/08 : [....] - Created // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Controls; using System.Windows.Ink; namespace MS.Internal.Ink { internal class DrawingAttributesDefaultValueFactory : DefaultValueFactory { internal DrawingAttributesDefaultValueFactory() { } ////// 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 DrawingAttributes(); } } ////// Creates a mutable default value /// internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { // Instantiate our default value instance. DrawingAttributes defaultValue = new DrawingAttributes(); // Add event handlers for tracking the changes on the default value instance. DrawingAttributesDefaultPromoter promoter = new DrawingAttributesDefaultPromoter((InkCanvas)owner); defaultValue.AttributeChanged += new PropertyDataChangedEventHandler(promoter.OnDrawingAttributesChanged); defaultValue.PropertyDataChanged += new PropertyDataChangedEventHandler(promoter.OnDrawingAttributesChanged); return defaultValue; } ////// A tracking class which monitors the sub-property changes on DrawingAttributes /// private class DrawingAttributesDefaultPromoter { ////// Constructor /// /// internal DrawingAttributesDefaultPromoter(InkCanvas owner) { _owner = owner; } ////// A handler for both AttributeChanged and PropertyDataChanged. /// /// /// internal void OnDrawingAttributesChanged(object sender, PropertyDataChangedEventArgs e) { DrawingAttributes value = (DrawingAttributes)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.AttributeChanged -= new PropertyDataChangedEventHandler(OnDrawingAttributesChanged); value.PropertyDataChanged -= new PropertyDataChangedEventHandler(OnDrawingAttributesChanged); // NTRAID#WINDOWS-1334059-2005/10/17-waynezen, // We only promote the value when there is no local value set yet. if (_owner.ReadLocalValue(InkCanvas.DefaultDrawingAttributesProperty) == DependencyProperty.UnsetValue) { // Promote the instance to the local value. _owner.SetValue(InkCanvas.DefaultDrawingAttributesProperty, 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 = InkCanvas.DefaultDrawingAttributesProperty.GetMetadata(_owner.DependencyObjectType); metadata.ClearCachedDefaultValue(_owner, InkCanvas.DefaultDrawingAttributesProperty); } private readonly InkCanvas _owner; } } } // 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 DrawingAttributes // // History: // 2005/11/08 : [....] - Created // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Controls; using System.Windows.Ink; namespace MS.Internal.Ink { internal class DrawingAttributesDefaultValueFactory : DefaultValueFactory { internal DrawingAttributesDefaultValueFactory() { } ////// 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 DrawingAttributes(); } } ////// Creates a mutable default value /// internal override object CreateDefaultValue(DependencyObject owner, DependencyProperty property) { // Instantiate our default value instance. DrawingAttributes defaultValue = new DrawingAttributes(); // Add event handlers for tracking the changes on the default value instance. DrawingAttributesDefaultPromoter promoter = new DrawingAttributesDefaultPromoter((InkCanvas)owner); defaultValue.AttributeChanged += new PropertyDataChangedEventHandler(promoter.OnDrawingAttributesChanged); defaultValue.PropertyDataChanged += new PropertyDataChangedEventHandler(promoter.OnDrawingAttributesChanged); return defaultValue; } ////// A tracking class which monitors the sub-property changes on DrawingAttributes /// private class DrawingAttributesDefaultPromoter { ////// Constructor /// /// internal DrawingAttributesDefaultPromoter(InkCanvas owner) { _owner = owner; } ////// A handler for both AttributeChanged and PropertyDataChanged. /// /// /// internal void OnDrawingAttributesChanged(object sender, PropertyDataChangedEventArgs e) { DrawingAttributes value = (DrawingAttributes)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.AttributeChanged -= new PropertyDataChangedEventHandler(OnDrawingAttributesChanged); value.PropertyDataChanged -= new PropertyDataChangedEventHandler(OnDrawingAttributesChanged); // NTRAID#WINDOWS-1334059-2005/10/17-waynezen, // We only promote the value when there is no local value set yet. if (_owner.ReadLocalValue(InkCanvas.DefaultDrawingAttributesProperty) == DependencyProperty.UnsetValue) { // Promote the instance to the local value. _owner.SetValue(InkCanvas.DefaultDrawingAttributesProperty, 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 = InkCanvas.DefaultDrawingAttributesProperty.GetMetadata(_owner.DependencyObjectType); metadata.ClearCachedDefaultValue(_owner, InkCanvas.DefaultDrawingAttributesProperty); } private readonly InkCanvas _owner; } } } // 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
- XslVisitor.cs
- Converter.cs
- DataRecordObjectView.cs
- RecipientInfo.cs
- COMException.cs
- GlyphManager.cs
- ToggleButton.cs
- UserPreferenceChangingEventArgs.cs
- IsolatedStorageException.cs
- UserControlParser.cs
- Transform3D.cs
- ToolboxItem.cs
- ImpersonateTokenRef.cs
- MergeFailedEvent.cs
- _SSPISessionCache.cs
- RegexRunnerFactory.cs
- XmlTypeMapping.cs
- Regex.cs
- SelectQueryOperator.cs
- VersionedStream.cs
- TextBlock.cs
- XPathAncestorIterator.cs
- RTLAwareMessageBox.cs
- ContainerTracking.cs
- GridViewRowCollection.cs
- VirtualPathProvider.cs
- CFStream.cs
- DataExpression.cs
- DependencyObject.cs
- TypeTypeConverter.cs
- ObjectDataSourceChooseMethodsPanel.cs
- controlskin.cs
- FullTextBreakpoint.cs
- XmlSchemaAttributeGroup.cs
- BitSet.cs
- InkPresenterAutomationPeer.cs
- LookupNode.cs
- SelectionHighlightInfo.cs
- SafeViewOfFileHandle.cs
- KoreanCalendar.cs
- TableAdapterManagerNameHandler.cs
- ParserStreamGeometryContext.cs
- RemotingSurrogateSelector.cs
- MD5CryptoServiceProvider.cs
- PrimitiveType.cs
- PriorityQueue.cs
- GeneralTransform3D.cs
- FastEncoder.cs
- TargetControlTypeAttribute.cs
- DictationGrammar.cs
- ElementHost.cs
- FormViewModeEventArgs.cs
- MetadataStore.cs
- LongValidator.cs
- EditorPartChrome.cs
- TabControl.cs
- ReflectPropertyDescriptor.cs
- ModuleConfigurationInfo.cs
- CharConverter.cs
- COSERVERINFO.cs
- XmlHierarchyData.cs
- Brush.cs
- ConfigLoader.cs
- TransformerInfoCollection.cs
- ECDsaCng.cs
- coordinator.cs
- ComEventsSink.cs
- SqlProviderManifest.cs
- BaseTreeIterator.cs
- ParameterToken.cs
- RepeatButton.cs
- Int64.cs
- StyleCollectionEditor.cs
- BorderSidesEditor.cs
- IntranetCredentialPolicy.cs
- AnyAllSearchOperator.cs
- DiscreteKeyFrames.cs
- ExpressionConverter.cs
- MDIClient.cs
- AnnotationService.cs
- ActiveDocumentEvent.cs
- SoapProtocolImporter.cs
- XmlTextReaderImplHelpers.cs
- BaseProcessor.cs
- SystemFonts.cs
- ConversionContext.cs
- WorkflowMarkupSerializer.cs
- FormView.cs
- InvokeWebService.cs
- OracleParameterBinding.cs
- DataGridViewAutoSizeModeEventArgs.cs
- RemoteWebConfigurationHostServer.cs
- ToolStripDropDownItem.cs
- ToolboxItemSnapLineBehavior.cs
- ContextStaticAttribute.cs
- ColorMatrix.cs
- VirtualDirectoryMappingCollection.cs
- ProviderCollection.cs
- Filter.cs
- AuthenticationManager.cs