Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / 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
- ApplicationSecurityInfo.cs
- FusionWrap.cs
- ReadOnlyCollectionBase.cs
- BigInt.cs
- RequestCacheManager.cs
- WindowsContainer.cs
- CryptoStream.cs
- CustomTypeDescriptor.cs
- Panel.cs
- FormsAuthenticationConfiguration.cs
- MenuCommand.cs
- ValueExpressions.cs
- MetadataItemEmitter.cs
- AdapterUtil.cs
- SingleStorage.cs
- ObjectFactoryCodeDomTreeGenerator.cs
- FakeModelPropertyImpl.cs
- XamlReader.cs
- ImageIndexConverter.cs
- MetaDataInfo.cs
- TextTreeInsertUndoUnit.cs
- CurrentChangingEventManager.cs
- IndexerHelper.cs
- TextMarkerSource.cs
- ResourceContainer.cs
- XmlAnyElementAttributes.cs
- XmlArrayItemAttribute.cs
- StylusCaptureWithinProperty.cs
- Model3DCollection.cs
- DelegateArgumentValue.cs
- CommandLineParser.cs
- SerializationAttributes.cs
- NetDispatcherFaultException.cs
- DataStreams.cs
- AsymmetricSignatureDeformatter.cs
- DataGridComboBoxColumn.cs
- XPathPatternBuilder.cs
- BuildProvider.cs
- ExternalException.cs
- MatrixAnimationBase.cs
- VScrollProperties.cs
- HttpResponseHeader.cs
- CodeMemberField.cs
- SystemDiagnosticsSection.cs
- OracleException.cs
- IgnoreFlushAndCloseStream.cs
- ModifiableIteratorCollection.cs
- RootNamespaceAttribute.cs
- X509CertificateClaimSet.cs
- MultipleViewProviderWrapper.cs
- RuleElement.cs
- OleDbInfoMessageEvent.cs
- ConfigXmlComment.cs
- SqlDataReader.cs
- FileClassifier.cs
- ImageIndexConverter.cs
- UIElementCollection.cs
- TextTreeInsertElementUndoUnit.cs
- mediaclock.cs
- DesignerActionVerbItem.cs
- X509IssuerSerialKeyIdentifierClause.cs
- HttpServerVarsCollection.cs
- CapabilitiesRule.cs
- ResolveNameEventArgs.cs
- GZipDecoder.cs
- HttpCapabilitiesEvaluator.cs
- Matrix3D.cs
- Message.cs
- StrokeNodeOperations.cs
- SmiEventSink.cs
- UriTemplateCompoundPathSegment.cs
- WriteLine.cs
- DataGridPageChangedEventArgs.cs
- VersionValidator.cs
- DataGrid.cs
- EmptyImpersonationContext.cs
- ReferentialConstraint.cs
- ProfessionalColors.cs
- PhonemeEventArgs.cs
- ListBindingConverter.cs
- ControlBindingsCollection.cs
- SqlAliasesReferenced.cs
- WebPartVerbsEventArgs.cs
- Margins.cs
- Repeater.cs
- MetadataFile.cs
- AssemblyResourceLoader.cs
- DecoderExceptionFallback.cs
- IssuedTokenParametersEndpointAddressElement.cs
- LocalValueEnumerator.cs
- Listbox.cs
- VisualBrush.cs
- FrameworkContentElementAutomationPeer.cs
- SqlVersion.cs
- GraphicsState.cs
- DesignTimeResourceProviderFactoryAttribute.cs
- FunctionCommandText.cs
- TransactionState.cs
- XmlEncodedRawTextWriter.cs
- EncoderNLS.cs