// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using MS.Internal.KnownBoxes;
 
namespace System.Windows
{
    /////////////////////////////////////////////////////////////////////////
 
    internal class FocusWithinProperty : ReverseInheritProperty
    {
        /////////////////////////////////////////////////////////////////////
 
        internal FocusWithinProperty() : base(
            UIElement.IsKeyboardFocusWithinPropertyKey,
            CoreFlags.IsKeyboardFocusWithinCache,
            CoreFlags.IsKeyboardFocusWithinChanged)
        {
        }
 
        /////////////////////////////////////////////////////////////////////
 
        internal override void FireNotifications(UIElement uie, ContentElement ce, UIElement3D uie3D, bool oldValue)
        {
            DependencyPropertyChangedEventArgs args = 
                    new DependencyPropertyChangedEventArgs(
                        UIElement.IsKeyboardFocusWithinProperty, 
                        BooleanBoxes.Box(oldValue), 
                        BooleanBoxes.Box(!oldValue));
            
            if (uie != null)
            {
                uie.RaiseIsKeyboardFocusWithinChanged(args);
            }
            else if (ce != null)
            {
                ce.RaiseIsKeyboardFocusWithinChanged(args);
            }
            else
            {
                uie3D?.RaiseIsKeyboardFocusWithinChanged(args);
            }
        }
    }
}