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.
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