Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / SizeChangedInfo.cs / 1305600 / SizeChangedInfo.cs
using System; namespace System.Windows { ////// The SizeChangedinfo class is used as a parameter to OnSizeRenderChanged. /// public class SizeChangedInfo { ////// Initializes a new instance of the SizeChangedinfo class. /// /// /// The element which size is changing. /// /// /// The size of the object before update. New size is element.RenderSize /// /// /// 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. /// /// /// 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 SizeChangedInfo(UIElement element, Size previousSize, bool widthChanged, bool heightChanged) { _element = element; _previousSize = previousSize; _widthChanged = widthChanged; _heightChanged = heightChanged; } ////// 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 _widthChanged; } } ////// 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 _heightChanged; } } //this method is used by UIElement to "accumulate" several cosequitive layout updates //into the single args object cahced on UIElement. Since the SizeChanged is deferred event, //there could be several size changes before it will actually fire. internal void Update(bool widthChanged, bool heightChanged) { _widthChanged = _widthChanged | widthChanged; _heightChanged = _heightChanged | heightChanged; } internal UIElement Element { get { return _element; } } private UIElement _element; private Size _previousSize; private bool _widthChanged; private bool _heightChanged; internal SizeChangedInfo Next; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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