Code:
/ 4.0 / 4.0 / untmp / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- MenuItemStyleCollection.cs
- TypefaceCollection.cs
- TextTreeInsertUndoUnit.cs
- TrackingConditionCollection.cs
- ApplicationServiceManager.cs
- ConfigViewGenerator.cs
- MergePropertyDescriptor.cs
- AutomationPropertyInfo.cs
- HeaderCollection.cs
- ChannelManagerBase.cs
- WebPartAddingEventArgs.cs
- SecurityKeyIdentifierClause.cs
- XPathAxisIterator.cs
- SymDocumentType.cs
- CoreChannel.cs
- CodeGenerator.cs
- TextEmbeddedObject.cs
- CodeAccessSecurityEngine.cs
- SQLMembershipProvider.cs
- ImageDrawing.cs
- MetadataImporterQuotas.cs
- MediaContextNotificationWindow.cs
- exports.cs
- DeclarativeCatalogPart.cs
- SkewTransform.cs
- TcpHostedTransportConfiguration.cs
- TcpConnectionPoolSettings.cs
- ProfilePropertyNameValidator.cs
- ArrayList.cs
- UnionCqlBlock.cs
- DataGridBoolColumn.cs
- PlacementWorkspace.cs
- RectangleConverter.cs
- MD5.cs
- Label.cs
- RotateTransform.cs
- PictureBox.cs
- RuntimeDelegateArgument.cs
- SharedDp.cs
- embossbitmapeffect.cs
- KeyPressEvent.cs
- COM2IProvidePropertyBuilderHandler.cs
- HtmlInputButton.cs
- TableItemPatternIdentifiers.cs
- WindowsListBox.cs
- PathNode.cs
- CompilerHelpers.cs
- SponsorHelper.cs
- FontUnit.cs
- ExceptionValidationRule.cs
- DefaultEventAttribute.cs
- DescriptionAttribute.cs
- AttributeProviderAttribute.cs
- SettingsAttributeDictionary.cs
- ClonableStack.cs
- GeneralTransform3DGroup.cs
- DataGridViewColumnHeaderCell.cs
- ActivityTypeResolver.xaml.cs
- SqlBooleanMismatchVisitor.cs
- Message.cs
- VirtualDirectoryMapping.cs
- CompilationLock.cs
- _FtpControlStream.cs
- OutputCacheModule.cs
- ListCommandEventArgs.cs
- ITreeGenerator.cs
- TraversalRequest.cs
- AnnouncementEndpointElement.cs
- MatrixUtil.cs
- RbTree.cs
- WebServiceClientProxyGenerator.cs
- WebBaseEventKeyComparer.cs
- GlyphingCache.cs
- StoreItemCollection.Loader.cs
- ClrPerspective.cs
- CultureMapper.cs
- BaseCodeDomTreeGenerator.cs
- DataGridColumnCollection.cs
- Composition.cs
- TemplatedWizardStep.cs
- HtmlInputText.cs
- DefaultHttpHandler.cs
- FrameworkElementFactory.cs
- OutputChannel.cs
- StateFinalizationActivity.cs
- CodeSubDirectory.cs
- SendMailErrorEventArgs.cs
- XmlArrayAttribute.cs
- ProviderBase.cs
- MULTI_QI.cs
- AsymmetricKeyExchangeFormatter.cs
- WaitHandleCannotBeOpenedException.cs
- ObjectSecurity.cs
- NativeWindow.cs
- BamlRecords.cs
- PositiveTimeSpanValidator.cs
- QuaternionKeyFrameCollection.cs
- GridViewPageEventArgs.cs
- DbBuffer.cs
- MetaType.cs