Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / SizeChangedEventArgs.cs / 1 / SizeChangedEventArgs.cs
using System; namespace System.Windows { ////// The SizeChangedEventArgs class is used by SizeChangedEventHandler. /// This handler is used for ComputedWidthChanged and ComputedHeightChanged events /// on UIElement. /// public class SizeChangedEventArgs : RoutedEventArgs { ////// Initializes a new instance of the SizeChangedEventArgs class. /// /// /// The UIElement which has its size changed by layout engine/>. /// /// /// The SizeChangeInfo that is used by. /// internal SizeChangedEventArgs(UIElement element, SizeChangedInfo info) { if (info == null) { throw new ArgumentNullException("info"); } if (element == null) { throw new ArgumentNullException("element"); } _element = element; _previousSize = info.PreviousSize; if(info.WidthChanged) _bits |= _widthChangedBit; if(info.HeightChanged) _bits |= _heightChangedBit; } /// /// Read-only access to the previous Size /// public Size PreviousSize { get { return _previousSize; } } ////// Read-only access to the new Size /// public Size NewSize { get { return _element.RenderSize; } } ////// Read-only access to the flag indicating that Width component of the size changed. /// Note that due to double math /// effects, the it may be (previousSize.Width != newSize.Width) and widthChanged = true. /// This may happen in layout when sizes of objects are fluctuating because of a precision "jitter" of /// the input parameters, but the overall scene is considered to be "the same" so no visible changes /// will be detected. Typically, the handler of SizeChangedEvent should check this bit to avoid /// invalidation of layout if the dimension didn't change. /// public bool WidthChanged { get { return ((_bits & _widthChangedBit) != 0); } } ////// Read-only access to the flag indicating that Height component of the size changed. /// Note that due to double math /// effects, the it may be (previousSize.Height != newSize.Height) and heightChanged = true. /// This may happen in layout when sizes of objects are fluctuating because of a precision "jitter" of /// the input parameters, but the overall scene is considered to be "the same" so no visible changes /// will be detected. Typically, the handler of SizeChangedEvent should check this bit to avoid /// invalidation of layout if the dimension didn't change. /// public bool HeightChanged { get { return ((_bits & _heightChangedBit) != 0); } } private Size _previousSize; private UIElement _element; private byte _bits; private static byte _widthChangedBit = 0x1; private static byte _heightChangedBit = 0x2; ////// The mechanism used to call the type-specific handler on the /// target. /// /// /// The generic handler to call in a type-specific way. /// /// /// The target to call the handler on. /// ///protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget) { SizeChangedEventHandler handler = (SizeChangedEventHandler) genericHandler; handler(genericTarget, this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System; namespace System.Windows { /// /// The SizeChangedEventArgs class is used by SizeChangedEventHandler. /// This handler is used for ComputedWidthChanged and ComputedHeightChanged events /// on UIElement. /// public class SizeChangedEventArgs : RoutedEventArgs { ////// Initializes a new instance of the SizeChangedEventArgs class. /// /// /// The UIElement which has its size changed by layout engine/>. /// /// /// The SizeChangeInfo that is used by. /// internal SizeChangedEventArgs(UIElement element, SizeChangedInfo info) { if (info == null) { throw new ArgumentNullException("info"); } if (element == null) { throw new ArgumentNullException("element"); } _element = element; _previousSize = info.PreviousSize; if(info.WidthChanged) _bits |= _widthChangedBit; if(info.HeightChanged) _bits |= _heightChangedBit; } /// /// Read-only access to the previous Size /// public Size PreviousSize { get { return _previousSize; } } ////// Read-only access to the new Size /// public Size NewSize { get { return _element.RenderSize; } } ////// Read-only access to the flag indicating that Width component of the size changed. /// Note that due to double math /// effects, the it may be (previousSize.Width != newSize.Width) and widthChanged = true. /// This may happen in layout when sizes of objects are fluctuating because of a precision "jitter" of /// the input parameters, but the overall scene is considered to be "the same" so no visible changes /// will be detected. Typically, the handler of SizeChangedEvent should check this bit to avoid /// invalidation of layout if the dimension didn't change. /// public bool WidthChanged { get { return ((_bits & _widthChangedBit) != 0); } } ////// Read-only access to the flag indicating that Height component of the size changed. /// Note that due to double math /// effects, the it may be (previousSize.Height != newSize.Height) and heightChanged = true. /// This may happen in layout when sizes of objects are fluctuating because of a precision "jitter" of /// the input parameters, but the overall scene is considered to be "the same" so no visible changes /// will be detected. Typically, the handler of SizeChangedEvent should check this bit to avoid /// invalidation of layout if the dimension didn't change. /// public bool HeightChanged { get { return ((_bits & _heightChangedBit) != 0); } } private Size _previousSize; private UIElement _element; private byte _bits; private static byte _widthChangedBit = 0x1; private static byte _heightChangedBit = 0x2; ////// The mechanism used to call the type-specific handler on the /// target. /// /// /// The generic handler to call in a type-specific way. /// /// /// The target to call the handler on. /// ///protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget) { SizeChangedEventHandler handler = (SizeChangedEventHandler) genericHandler; handler(genericTarget, this); } } } // 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
- SHA512.cs
- CqlWriter.cs
- FactoryGenerator.cs
- LazyTextWriterCreator.cs
- Point3DCollectionConverter.cs
- RoutingBehavior.cs
- HMACSHA384.cs
- ArraySegment.cs
- URLString.cs
- ModelUIElement3D.cs
- KernelTypeValidation.cs
- HtmlInputFile.cs
- Helpers.cs
- CellParagraph.cs
- ExtentJoinTreeNode.cs
- DatagridviewDisplayedBandsData.cs
- CodeTryCatchFinallyStatement.cs
- SchemaEntity.cs
- MailBnfHelper.cs
- SimpleTypeResolver.cs
- DefaultSerializationProviderAttribute.cs
- TableRow.cs
- ModelUtilities.cs
- ComMethodElementCollection.cs
- DataGridViewCellStyleEditor.cs
- Misc.cs
- EntityModelSchemaGenerator.cs
- WebPartManagerInternals.cs
- ListView.cs
- ExpressionBindingsDialog.cs
- PropertyEmitter.cs
- TableCell.cs
- RSAPKCS1KeyExchangeDeformatter.cs
- Brush.cs
- LineUtil.cs
- InvalidEnumArgumentException.cs
- CloseCollectionAsyncResult.cs
- XmlUtilWriter.cs
- FormParameter.cs
- MetadataSerializer.cs
- RuleInfoComparer.cs
- BaseProcessor.cs
- SqlDependencyUtils.cs
- FlowLayout.cs
- StorageMappingItemLoader.cs
- StructuralCache.cs
- BaseResourcesBuildProvider.cs
- MetabaseServerConfig.cs
- HMACRIPEMD160.cs
- DemultiplexingClientMessageFormatter.cs
- StorageComplexPropertyMapping.cs
- SelectionPattern.cs
- SemanticResultValue.cs
- VSWCFServiceContractGenerator.cs
- SerializationFieldInfo.cs
- DispatcherOperation.cs
- CommandDesigner.cs
- QilFactory.cs
- SetterBase.cs
- NamespaceQuery.cs
- MemberDescriptor.cs
- GeometryCollection.cs
- SchemaDeclBase.cs
- QilUnary.cs
- JumpTask.cs
- VectorValueSerializer.cs
- objectresult_tresulttype.cs
- ConfigXmlSignificantWhitespace.cs
- SqlDataRecord.cs
- WindowsEditBox.cs
- ComboBoxDesigner.cs
- DataGridLinkButton.cs
- CompositeActivityDesigner.cs
- RelationshipManager.cs
- MgmtConfigurationRecord.cs
- ManagedCodeMarkers.cs
- HtmlUtf8RawTextWriter.cs
- LoginDesigner.cs
- TextContainerChangedEventArgs.cs
- SiteMapNodeItem.cs
- UnsafePeerToPeerMethods.cs
- ToolboxItem.cs
- FloaterParaClient.cs
- GroupBox.cs
- DesignUtil.cs
- WebZoneDesigner.cs
- SystemSounds.cs
- SequenceDesignerAccessibleObject.cs
- Constant.cs
- StatusBarPanelClickEvent.cs
- ParameterCollectionEditorForm.cs
- WS2007HttpBinding.cs
- MessageBuilder.cs
- OneWayBindingElementImporter.cs
- CompilerTypeWithParams.cs
- BridgeDataRecord.cs
- SignatureGenerator.cs
- CookielessData.cs
- DictionaryBase.cs
- HostingEnvironmentException.cs