FocusChangedEventArgs.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 / Input / FocusChangedEventArgs.cs / 1 / FocusChangedEventArgs.cs
                        

                        
                            using System;

using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID; 

namespace System.Windows.Input 
{ 
    /// 
    ///     The KeyboardFocusChangedEventArgs class contains information about key states. 
    /// 
    public class KeyboardFocusChangedEventArgs : KeyboardEventArgs
    {
        ///  
        ///     Constructs an instance of the KeyboardFocusChangedEventArgs class.
        ///  
        ///  
        ///     The logical keyboard device associated with this event.
        ///  
        /// 
        ///     The time when the input occured.
        /// 
        ///  
        ///     The element that previously had focus.
        ///  
        ///  
        ///     The element that now has focus.
        ///  
        public KeyboardFocusChangedEventArgs(KeyboardDevice keyboard, int timestamp, IInputElement oldFocus, IInputElement newFocus) : base(keyboard, timestamp)
        {
            if (oldFocus != null && !InputElement.IsValid(oldFocus))
                throw new InvalidOperationException(SR.Get(SRID.Invalid_IInputElement, oldFocus.GetType())); 

            if (newFocus != null && !InputElement.IsValid(newFocus)) 
                throw new InvalidOperationException(SR.Get(SRID.Invalid_IInputElement, newFocus.GetType())); 

            _oldFocus = oldFocus; 
            _newFocus = newFocus;
        }

        ///  
        ///     The element that previously had focus.
        ///  
        public IInputElement OldFocus 
        {
            get {return _oldFocus;} 
        }

        /// 
        ///     The element that now has focus. 
        /// 
        public IInputElement NewFocus 
        { 
            get {return _newFocus;}
        } 

        /// 
        ///     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)
        { 
            KeyboardFocusChangedEventHandler handler = (KeyboardFocusChangedEventHandler) genericHandler;
 
            handler(genericTarget, this); 
        }
 
        private IInputElement _oldFocus;
        private IInputElement _newFocus;
    }
} 

 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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