Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / 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
- ObjectCloneHelper.cs
- WindowsStatusBar.cs
- LabelEditEvent.cs
- XmlArrayItemAttributes.cs
- StaticDataManager.cs
- DataStreams.cs
- XmlNullResolver.cs
- NavigationProgressEventArgs.cs
- SplitterEvent.cs
- MessageTransmitTraceRecord.cs
- CheckBoxDesigner.cs
- CryptoApi.cs
- NetworkInformationPermission.cs
- QilValidationVisitor.cs
- ArgumentOutOfRangeException.cs
- ObjectConverter.cs
- WorkflowTimerService.cs
- PublisherIdentityPermission.cs
- DbConnectionPoolCounters.cs
- DirectoryGroupQuery.cs
- TemplateInstanceAttribute.cs
- IncrementalHitTester.cs
- MatrixTransform3D.cs
- ListViewItemSelectionChangedEvent.cs
- VariableValue.cs
- DefaultExpressionVisitor.cs
- ThemeDictionaryExtension.cs
- ImageAnimator.cs
- AssemblyHash.cs
- RichTextBox.cs
- ToolStripDesignerAvailabilityAttribute.cs
- XPathException.cs
- StrokeNodeOperations.cs
- Decimal.cs
- XmlJsonWriter.cs
- DirectoryRedirect.cs
- Util.cs
- AdornedElementPlaceholder.cs
- Stream.cs
- ScriptServiceAttribute.cs
- ListCollectionView.cs
- Int32CAMarshaler.cs
- Base64Stream.cs
- AuthorizationRule.cs
- SecurityPermission.cs
- X509CertificateClaimSet.cs
- SinglePageViewer.cs
- DbConnectionPoolGroupProviderInfo.cs
- DbConvert.cs
- EntityDataSourceWrapper.cs
- DiscardableAttribute.cs
- dbdatarecord.cs
- PolicyStatement.cs
- TextParagraphCache.cs
- Vector.cs
- ConfigXmlWhitespace.cs
- JumpItem.cs
- BlockUIContainer.cs
- TreeViewCancelEvent.cs
- SqlClientFactory.cs
- HostVisual.cs
- TextBlock.cs
- NameValueFileSectionHandler.cs
- PropertyDescriptorCollection.cs
- GuidTagList.cs
- DataSourceProvider.cs
- CancelEventArgs.cs
- ToolStripItem.cs
- MemberDomainMap.cs
- AsyncStreamReader.cs
- MatrixAnimationUsingPath.cs
- ActivityTrace.cs
- RtfControls.cs
- XamlTypeMapperSchemaContext.cs
- XsdDuration.cs
- EventMap.cs
- Number.cs
- prompt.cs
- ScrollPatternIdentifiers.cs
- HttpHandlerActionCollection.cs
- MouseActionConverter.cs
- SecureStringHasher.cs
- RequestStatusBarUpdateEventArgs.cs
- FacetValues.cs
- TreeView.cs
- PrePostDescendentsWalker.cs
- cryptoapiTransform.cs
- SafeProcessHandle.cs
- TreeIterator.cs
- Graph.cs
- RC2CryptoServiceProvider.cs
- BuildResult.cs
- SQLInt32.cs
- EmptyEnumerator.cs
- TransformValueSerializer.cs
- WebHttpBindingCollectionElement.cs
- CryptoConfig.cs
- XmlSchemaObjectTable.cs
- Base64Stream.cs
- TickBar.cs