ScrollChangedEventArgs.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / ScrollChangedEventArgs.cs / 1305600 / ScrollChangedEventArgs.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

 
using System; 
using System.Windows;
 
namespace System.Windows.Controls
{
    /// 
    /// This delegate is used by handlers of the ScrollChangedEvent event. 
    /// 
    /// The current element along the event's route. 
    /// The event arguments containing additional information about the event. 
    /// Nothing.
    public delegate void ScrollChangedEventHandler(object sender, ScrollChangedEventArgs e); 

    /// 
    /// The ScrollChangedEventsArgs describe a change in scrolling state.
    ///  
    public class ScrollChangedEventArgs: RoutedEventArgs
    { 
        //------------------------------------------------------------------- 
        //
        //  Constructors 
        //
        //-------------------------------------------------------------------

        #region Constructors 

        ///  
        /// Constructor 
        /// 
        internal ScrollChangedEventArgs(Vector offset, Vector offsetChange, Size extent, Vector extentChange, Size viewport, Vector viewportChange) 
        {
            _offset = offset;
            _offsetChange = offsetChange;
            _extent = extent; 
            _extentChange = extentChange;
            _viewport = viewport; 
            _viewportChange = viewportChange; 
        }
 
        #endregion Constructors

        //--------------------------------------------------------------------
        // 
        //  Public Properties (CLR + Avalon)
        // 
        //------------------------------------------------------------------- 

        #region Public Properties 

        /// 
        /// Updated HorizontalPosition of the scrolled content
        ///  
        /// 
        public double HorizontalOffset 
        { 
            get { return _offset.X; }
        } 
        /// 
        /// Updated VerticalPosition of the scrolled content
        /// 
        ///  
        public double VerticalOffset
        { 
            get { return _offset.Y; } 
        }
        ///  
        /// Change in horizontal offset of the scrolled content
        /// 
        /// 
        public double HorizontalChange 
        {
            get { return _offsetChange.X; } 
        } 
        /// 
        /// Change in vertical offset of the scrolled content 
        /// 
        /// 
        public double VerticalChange
        { 
            get { return _offsetChange.Y; }
        } 
 
        /// 
        /// Updated horizontal size of the viewing window of the ScrollViewer 
        /// 
        /// 
        public double ViewportWidth
        { 
            get { return _viewport.Width; }
        } 
        ///  
        /// Updated vertical size of the viewing window of the ScrollViewer.
        ///  
        /// 
        public double ViewportHeight
        {
            get { return _viewport.Height; } 
        }
        ///  
        /// Change in the horizontal size of the viewing window of the ScrollViewer 
        /// 
        ///  
        public double ViewportWidthChange
        {
            get { return _viewportChange.X; }
        } 
        /// 
        /// Change in the vertical size of the viewing window of the ScrollViewer. 
        ///  
        /// 
        public double ViewportHeightChange 
        {
            get { return _viewportChange.Y; }
        }
 
        /// 
        /// Updated horizontal size of the scrollable content. 
        ///  
        /// 
        public double ExtentWidth 
        {
            get { return _extent.Width; }
        }
        ///  
        /// Updated vertical size of the scrollable content.
        ///  
        ///  
        public double ExtentHeight
        { 
            get { return _extent.Height; }
        }
        /// 
        /// Change in the horizontal size of the scrollable content. 
        /// 
        ///  
        public double ExtentWidthChange 
        {
            get { return _extentChange.X; } 
        }
        /// 
        /// Change in the vertical size of the scrollable content.
        ///  
        /// 
        public double ExtentHeightChange 
        { 
            get { return _extentChange.Y; }
        } 

        #endregion

        //-------------------------------------------------------------------- 
        //
        //  Protected Methods 
            // 
        //--------------------------------------------------------------------
 
        #region Protected Methods

        /// 
        /// This method is used to perform the proper type casting in order to 
        /// call the type-safe ScrollChangedEventHandler delegate for the ScrollChangedEvent event.
        ///  
        /// The handler to invoke. 
        /// The current object along the event's route.
        protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget) 
        {
            ScrollChangedEventHandler handler = (ScrollChangedEventHandler)genericHandler;
            handler(genericTarget, this);
        } 

        #endregion 
 
        //-------------------------------------------------------------------
        // 
        //  Private Fields
        //
        //--------------------------------------------------------------------
 
        #region Private Fields
 
        // Current scroll data 
        private Vector _offset;
        private Vector _offsetChange; 
        private Size   _extent;
        private Vector _extentChange;
        private Size   _viewport;
        private Vector _viewportChange; 

        #endregion 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ScrollChangedEventArgs.cs source code in C# .NET

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