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
- ThemeDictionaryExtension.cs
- EdmMember.cs
- GlyphShapingProperties.cs
- ReadOnlyPropertyMetadata.cs
- QuaternionAnimation.cs
- TextEditorThreadLocalStore.cs
- HtmlInputCheckBox.cs
- ToolStripButton.cs
- Encoding.cs
- Opcode.cs
- FormViewModeEventArgs.cs
- ProgressBarAutomationPeer.cs
- ObjectFullSpanRewriter.cs
- GroupBox.cs
- RegexFCD.cs
- TransactionTraceIdentifier.cs
- Calendar.cs
- ColumnResizeAdorner.cs
- VisualBrush.cs
- SizeAnimationBase.cs
- SelectionPattern.cs
- ProcessHostServerConfig.cs
- HTMLTextWriter.cs
- XmlDocumentFragment.cs
- PersonalizationStateQuery.cs
- FlowPanelDesigner.cs
- FontStretchConverter.cs
- SoapEnumAttribute.cs
- WebServicesInteroperability.cs
- ValueSerializer.cs
- VirtualPath.cs
- RemoveStoryboard.cs
- mediaeventargs.cs
- KeySplineConverter.cs
- TriggerBase.cs
- ReflectionServiceProvider.cs
- DrawingContextDrawingContextWalker.cs
- isolationinterop.cs
- PropertyConverter.cs
- SettingsAttributeDictionary.cs
- SchemaCollectionPreprocessor.cs
- jithelpers.cs
- Int32KeyFrameCollection.cs
- ContentDisposition.cs
- AutomationProperties.cs
- Table.cs
- ConfigurationSection.cs
- ContractsBCL.cs
- FrameworkPropertyMetadata.cs
- ReachFixedPageSerializer.cs
- XmlDigitalSignatureProcessor.cs
- FaultPropagationRecord.cs
- OleDbDataReader.cs
- DataBoundControl.cs
- ALinqExpressionVisitor.cs
- _SingleItemRequestCache.cs
- InlinedAggregationOperator.cs
- ColumnHeaderConverter.cs
- DependencyObjectType.cs
- StringWriter.cs
- MetadataArtifactLoaderResource.cs
- AnnouncementClient.cs
- XmlMemberMapping.cs
- FileDialog.cs
- DirectionalLight.cs
- CanonicalXml.cs
- DataMemberAttribute.cs
- SchemaMapping.cs
- TrackingRecord.cs
- SerializableReadOnlyDictionary.cs
- Monitor.cs
- Page.cs
- TraceContextRecord.cs
- UniqueEventHelper.cs
- SamlAssertion.cs
- ScriptResourceMapping.cs
- Schema.cs
- XpsS0ValidatingLoader.cs
- WindowsListBox.cs
- MetadataHelper.cs
- HttpListenerException.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- SystemIcmpV4Statistics.cs
- DataGridSortCommandEventArgs.cs
- Psha1DerivedKeyGenerator.cs
- Signature.cs
- SqlMethods.cs
- InkCanvasSelection.cs
- FixedDSBuilder.cs
- SQLBytes.cs
- CodeChecksumPragma.cs
- FieldCollectionEditor.cs
- WindowsGraphicsCacheManager.cs
- MemberJoinTreeNode.cs
- MimeWriter.cs
- PageRanges.cs
- WindowsSlider.cs
- TextAdaptor.cs
- SymmetricKeyWrap.cs
- TdsParser.cs