Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- LocalizationParserHooks.cs
- PropertyChange.cs
- SyndicationItemFormatter.cs
- SafeEventLogReadHandle.cs
- FixedSOMTextRun.cs
- ProjectionPlan.cs
- TypeNameConverter.cs
- UnionCodeGroup.cs
- BitmapMetadataBlob.cs
- UntrustedRecipientException.cs
- odbcmetadatafactory.cs
- UnsafeNetInfoNativeMethods.cs
- DocumentGridContextMenu.cs
- RegexNode.cs
- Cursors.cs
- WsatAdminException.cs
- SystemException.cs
- ContainerUIElement3D.cs
- StoreContentChangedEventArgs.cs
- StrokeDescriptor.cs
- X509SecurityToken.cs
- MdImport.cs
- ACE.cs
- StylusCollection.cs
- XsltCompileContext.cs
- ISFClipboardData.cs
- COM2Enum.cs
- ThreadPoolTaskScheduler.cs
- WindowsToolbarItemAsMenuItem.cs
- OleDbMetaDataFactory.cs
- FileSystemInfo.cs
- StatusStrip.cs
- CollectionViewGroupRoot.cs
- SafeNativeMethods.cs
- AppSettingsSection.cs
- SettingsPropertyWrongTypeException.cs
- PropertyItem.cs
- SslStreamSecurityBindingElement.cs
- FileVersionInfo.cs
- DataSetMappper.cs
- CheckBoxField.cs
- DocumentationServerProtocol.cs
- OracleCommand.cs
- HttpException.cs
- sqlcontext.cs
- EncoderParameters.cs
- PopupRoot.cs
- RequestSecurityTokenResponseCollection.cs
- ResourcePool.cs
- SetterBase.cs
- UriSection.cs
- UIElementIsland.cs
- DirectoryNotFoundException.cs
- RtfToken.cs
- FlowDocumentReaderAutomationPeer.cs
- ToolStripDropDown.cs
- ObjectQueryProvider.cs
- ProjectionQueryOptionExpression.cs
- AsyncCompletedEventArgs.cs
- FloaterBaseParagraph.cs
- ButtonPopupAdapter.cs
- CharStorage.cs
- XmlCharacterData.cs
- TriggerCollection.cs
- ResponseBodyWriter.cs
- EntryIndex.cs
- TagMapCollection.cs
- UnsafeNativeMethodsTablet.cs
- ClientFormsIdentity.cs
- isolationinterop.cs
- PostBackOptions.cs
- Rectangle.cs
- ElementsClipboardData.cs
- RelationshipEntry.cs
- HttpCacheParams.cs
- InlineUIContainer.cs
- Site.cs
- TimeoutValidationAttribute.cs
- SupportsEventValidationAttribute.cs
- StopStoryboard.cs
- EncoderExceptionFallback.cs
- NavigationPropertyAccessor.cs
- ResumeStoryboard.cs
- CodeDelegateCreateExpression.cs
- HtmlObjectListAdapter.cs
- ServerIdentity.cs
- Int32EqualityComparer.cs
- TranslateTransform.cs
- PenContexts.cs
- DoubleCollectionConverter.cs
- DynamicMethod.cs
- ListViewGroup.cs
- ACE.cs
- PrivilegeNotHeldException.cs
- HttpWebRequestElement.cs
- ImageClickEventArgs.cs
- IISMapPath.cs
- DesignerForm.cs
- StateWorkerRequest.cs
- TabControlCancelEvent.cs