SizeChangedInfo.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / SizeChangedInfo.cs / 1 / 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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