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
- InvalidEnumArgumentException.cs
- Msec.cs
- CodeStatementCollection.cs
- GroupAggregateExpr.cs
- TemplateBindingExpression.cs
- RegionData.cs
- CallbackHandler.cs
- RequestUriProcessor.cs
- ContainerSelectorActiveEvent.cs
- PlatformCulture.cs
- CompositeScriptReference.cs
- InternalMappingException.cs
- SerializationSectionGroup.cs
- SignedInfo.cs
- ProxyElement.cs
- PointCollection.cs
- RelatedImageListAttribute.cs
- FormatterServicesNoSerializableCheck.cs
- TreeViewCancelEvent.cs
- BitmapSizeOptions.cs
- HwndStylusInputProvider.cs
- DefaultValidator.cs
- FilteredDataSetHelper.cs
- XmlException.cs
- CfgParser.cs
- SchemaCollectionCompiler.cs
- UnsafeCollabNativeMethods.cs
- CellTreeSimplifier.cs
- DesignerDataSourceView.cs
- ModifierKeysConverter.cs
- SymbolTable.cs
- TextFormatterContext.cs
- AssemblyEvidenceFactory.cs
- ChangeInterceptorAttribute.cs
- ListViewDeleteEventArgs.cs
- Certificate.cs
- BmpBitmapEncoder.cs
- RecordConverter.cs
- AssemblyBuilderData.cs
- BufferedStream2.cs
- Helpers.cs
- ConfigurationLocationCollection.cs
- EventPrivateKey.cs
- EntityKeyElement.cs
- TypeToken.cs
- GridViewItemAutomationPeer.cs
- FileRecordSequenceCompletedAsyncResult.cs
- TemplatedWizardStep.cs
- SynchronizationHandlesCodeDomSerializer.cs
- ConnectionModeReader.cs
- HtmlInputControl.cs
- XmlAttribute.cs
- WindowsToolbarAsMenu.cs
- ParameterInfo.cs
- Bezier.cs
- DatePickerTextBox.cs
- BrowserPolicyValidator.cs
- LinqDataSourceDisposeEventArgs.cs
- MarshalByValueComponent.cs
- Int64Converter.cs
- ScriptHandlerFactory.cs
- SqlResolver.cs
- ResourceExpression.cs
- MarshalByValueComponent.cs
- Compress.cs
- TreeNodeCollectionEditorDialog.cs
- BuildManagerHost.cs
- SqlNotificationRequest.cs
- WebExceptionStatus.cs
- InheritanceAttribute.cs
- SafeIUnknown.cs
- LogicalTreeHelper.cs
- GeometryDrawing.cs
- CompositeControl.cs
- ToolStripSeparator.cs
- TextWriterTraceListener.cs
- BeginStoryboard.cs
- DataGridTextBoxColumn.cs
- WebPartPersonalization.cs
- JavaScriptString.cs
- DataGridViewCellStyle.cs
- QuaternionValueSerializer.cs
- ProofTokenCryptoHandle.cs
- BooleanConverter.cs
- GroupedContextMenuStrip.cs
- ExpressionsCollectionConverter.cs
- CreateUserWizard.cs
- controlskin.cs
- TemplatedMailWebEventProvider.cs
- HttpAsyncResult.cs
- MonthChangedEventArgs.cs
- GeneralTransform3DTo2DTo3D.cs
- BitmapEffectrendercontext.cs
- ProtocolsConfigurationHandler.cs
- HtmlTableRow.cs
- AppSettings.cs
- EncoderExceptionFallback.cs
- DataPagerFieldItem.cs
- HierarchicalDataBoundControl.cs
- BooleanFacetDescriptionElement.cs