Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / SizeChangedEventArgs.cs / 1305600 / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WebPartEditorCancelVerb.cs
- ModifierKeysConverter.cs
- Journal.cs
- EntityDataSourceChangedEventArgs.cs
- WorkflowServiceHost.cs
- log.cs
- Stylus.cs
- ErrorEventArgs.cs
- AnnotationService.cs
- SymbolPair.cs
- ScalarType.cs
- DataGridViewAccessibleObject.cs
- SafeFileMapViewHandle.cs
- GeometryHitTestResult.cs
- Library.cs
- EntityCommand.cs
- GB18030Encoding.cs
- ConstraintEnumerator.cs
- SR.Designer.cs
- Pkcs9Attribute.cs
- XMLSchema.cs
- Cursors.cs
- ResourceManagerWrapper.cs
- securitycriticaldataformultiplegetandset.cs
- RuleConditionDialog.cs
- FilteredDataSetHelper.cs
- CodeGotoStatement.cs
- ContourSegment.cs
- SyndicationContent.cs
- FixedTextBuilder.cs
- BitmapCache.cs
- FilterableData.cs
- _SafeNetHandles.cs
- WebProxyScriptElement.cs
- FrugalMap.cs
- SQLByte.cs
- OlePropertyStructs.cs
- RoleManagerSection.cs
- StateWorkerRequest.cs
- TemplateControlBuildProvider.cs
- PersianCalendar.cs
- DesignBindingEditor.cs
- ConfigXmlCDataSection.cs
- HiddenFieldPageStatePersister.cs
- MdbDataFileEditor.cs
- GridToolTip.cs
- FlowLayoutSettings.cs
- StrokeIntersection.cs
- WebResourceAttribute.cs
- BinaryObjectInfo.cs
- SrgsElementFactoryCompiler.cs
- ProcessManager.cs
- ComponentChangingEvent.cs
- SchemaInfo.cs
- AttributeCollection.cs
- ValidationService.cs
- SettingsBase.cs
- RoutedEvent.cs
- TreeView.cs
- __FastResourceComparer.cs
- StylusOverProperty.cs
- PlaceHolder.cs
- _emptywebproxy.cs
- Compiler.cs
- MembershipUser.cs
- WebPartDisplayModeCollection.cs
- TreeNodeBinding.cs
- HttpListenerRequest.cs
- XmlAttributes.cs
- RefreshEventArgs.cs
- Memoizer.cs
- DataGridCellAutomationPeer.cs
- GenericWebPart.cs
- DateTime.cs
- ProgressBarAutomationPeer.cs
- ValidatorCompatibilityHelper.cs
- DbParameterCollectionHelper.cs
- GuidelineSet.cs
- MenuItemCollectionEditorDialog.cs
- NamespaceInfo.cs
- X509RecipientCertificateServiceElement.cs
- OleDbEnumerator.cs
- RequestChannelBinder.cs
- HostProtectionException.cs
- WebPartTransformerAttribute.cs
- EDesignUtil.cs
- AccessDataSource.cs
- ReaderOutput.cs
- SafeNativeMemoryHandle.cs
- VersionedStream.cs
- DrawingDrawingContext.cs
- ClonableStack.cs
- DataTemplate.cs
- XmlAttributeAttribute.cs
- TextProviderWrapper.cs
- ColumnReorderedEventArgs.cs
- CodeDelegateCreateExpression.cs
- StreamGeometry.cs
- GenericsNotImplementedException.cs
- CodeDefaultValueExpression.cs