Code:
/ 4.0 / 4.0 / 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. 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
- SoapObjectWriter.cs
- DataRelation.cs
- GeneralTransformCollection.cs
- TypeLibraryHelper.cs
- _emptywebproxy.cs
- DataGridViewColumnStateChangedEventArgs.cs
- DeleteMemberBinder.cs
- XXXOnTypeBuilderInstantiation.cs
- QuaternionRotation3D.cs
- PipeException.cs
- IteratorFilter.cs
- WebPartHelpVerb.cs
- CodeArrayIndexerExpression.cs
- ComplexBindingPropertiesAttribute.cs
- ValidationEventArgs.cs
- Message.cs
- TabletDeviceInfo.cs
- FontClient.cs
- SubMenuStyle.cs
- FormViewUpdateEventArgs.cs
- AppDomainUnloadedException.cs
- ExtensionSurface.cs
- ArcSegment.cs
- DocumentsTrace.cs
- PointHitTestParameters.cs
- ExtensionDataReader.cs
- WebContentFormatHelper.cs
- ConfigurationManagerHelper.cs
- CustomAttributeFormatException.cs
- EllipseGeometry.cs
- DtrList.cs
- Debug.cs
- cryptoapiTransform.cs
- PersistChildrenAttribute.cs
- Canvas.cs
- ImageBrush.cs
- SqlMethodAttribute.cs
- Compiler.cs
- ExpandableObjectConverter.cs
- MeasureItemEvent.cs
- HtmlInputImage.cs
- SQLCharsStorage.cs
- HttpModule.cs
- MetaType.cs
- ExtractedStateEntry.cs
- FixedPage.cs
- WorkflowDebuggerSteppingAttribute.cs
- GridViewDeleteEventArgs.cs
- TextTreeTextBlock.cs
- PipelineComponent.cs
- LateBoundBitmapDecoder.cs
- XmlAnyElementAttributes.cs
- PageParserFilter.cs
- FieldCollectionEditor.cs
- NativeBuffer.cs
- BitmapCodecInfoInternal.cs
- TextElementCollectionHelper.cs
- MulticastNotSupportedException.cs
- Viewport2DVisual3D.cs
- SingleStorage.cs
- DataGridViewSelectedRowCollection.cs
- SqlClientFactory.cs
- SrgsElementFactory.cs
- CellLabel.cs
- Dispatcher.cs
- Missing.cs
- IsolatedStoragePermission.cs
- UnsafeNativeMethods.cs
- LocationUpdates.cs
- TimeSpanStorage.cs
- PrintPreviewControl.cs
- CategoryValueConverter.cs
- TraceInternal.cs
- Int16AnimationBase.cs
- ToolStripRenderer.cs
- TypeUtils.cs
- HtmlTextArea.cs
- GridViewDeletedEventArgs.cs
- HMACRIPEMD160.cs
- DataSourceProvider.cs
- OleDbStruct.cs
- AutomationPatternInfo.cs
- HwndHost.cs
- DetailsViewDeleteEventArgs.cs
- ErrorWebPart.cs
- Vector3DAnimation.cs
- RsaKeyGen.cs
- SqlRewriteScalarSubqueries.cs
- BitmapEffectInput.cs
- NativeCompoundFileAPIs.cs
- CompiledIdentityConstraint.cs
- InternalConfigRoot.cs
- ShaderRenderModeValidation.cs
- EmptyStringExpandableObjectConverter.cs
- SqlBulkCopy.cs
- GlyphTypeface.cs
- HttpHandlerAction.cs
- ContainerFilterService.cs
- CheckBoxAutomationPeer.cs
- InteropDesigner.xaml.cs