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
- ForwardPositionQuery.cs
- StylusButton.cs
- ShadowGlyph.cs
- GenericUI.cs
- DocumentPageViewAutomationPeer.cs
- TcpProcessProtocolHandler.cs
- PathTooLongException.cs
- EnumType.cs
- QilStrConcatenator.cs
- ChtmlMobileTextWriter.cs
- DbParameterHelper.cs
- ProviderIncompatibleException.cs
- ClonableStack.cs
- ExpandedProjectionNode.cs
- BackStopAuthenticationModule.cs
- ReferenceConverter.cs
- VectorCollectionValueSerializer.cs
- XmlAtomicValue.cs
- LocatorManager.cs
- DetailsViewCommandEventArgs.cs
- Debug.cs
- StringDictionaryCodeDomSerializer.cs
- Stack.cs
- ItemsControlAutomationPeer.cs
- SelectionChangedEventArgs.cs
- TextProviderWrapper.cs
- BookmarkOptionsHelper.cs
- PropertyManager.cs
- XmlQueryOutput.cs
- XamlSerializerUtil.cs
- DataListItemCollection.cs
- PropertyEntry.cs
- ConcurrentBag.cs
- ControlCollection.cs
- PartitionerQueryOperator.cs
- XmlStringTable.cs
- AuthenticationSection.cs
- SynchronizationContext.cs
- DataBinder.cs
- SecurityTokenTypes.cs
- DispatchChannelSink.cs
- TextEditorContextMenu.cs
- PrintPageEvent.cs
- RadioButtonList.cs
- HybridWebProxyFinder.cs
- ProviderUtil.cs
- PatternMatchRules.cs
- DrawingImage.cs
- BindToObject.cs
- ConfigurationStrings.cs
- NameObjectCollectionBase.cs
- LocationChangedEventArgs.cs
- SiteMapNodeItemEventArgs.cs
- IList.cs
- StubHelpers.cs
- SplineKeyFrames.cs
- BitSet.cs
- DtdParser.cs
- SessionStateModule.cs
- WebScriptMetadataMessage.cs
- PolicyVersion.cs
- GridViewCancelEditEventArgs.cs
- DbMetaDataCollectionNames.cs
- AdapterUtil.cs
- SqlVisitor.cs
- _Win32.cs
- DataGridCommandEventArgs.cs
- ValidationRuleCollection.cs
- MessageDescriptionCollection.cs
- EncryptedKeyIdentifierClause.cs
- messageonlyhwndwrapper.cs
- ValidationVisibilityAttribute.cs
- ConnectionStringSettingsCollection.cs
- XmlEnumAttribute.cs
- RunInstallerAttribute.cs
- SctClaimSerializer.cs
- XmlReaderSettings.cs
- WindowsSysHeader.cs
- Transactions.cs
- ChannelServices.cs
- AttachedPropertyBrowsableAttribute.cs
- DSACryptoServiceProvider.cs
- securitycriticaldataClass.cs
- OracleFactory.cs
- CompilerInfo.cs
- ImportContext.cs
- OdbcConnectionPoolProviderInfo.cs
- LockRecursionException.cs
- FilterEventArgs.cs
- EventRouteFactory.cs
- IdnMapping.cs
- LocalServiceSecuritySettings.cs
- CustomError.cs
- CategoryAttribute.cs
- PrivacyNoticeElement.cs
- WbemException.cs
- EventLogPermissionAttribute.cs
- PropertyTabChangedEvent.cs
- ArrayExtension.cs
- AlignmentXValidation.cs