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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Windows.Input;
namespace System.Windows
{
/////////////////////////////////////////////////////////////////////////
internal class MouseOverProperty : ReverseInheritProperty
{
/////////////////////////////////////////////////////////////////////
internal MouseOverProperty() : base(
UIElement.IsMouseOverPropertyKey,
CoreFlags.IsMouseOverCache,
CoreFlags.IsMouseOverChanged)
{
}
/////////////////////////////////////////////////////////////////////
internal override void FireNotifications(UIElement uie, ContentElement ce, UIElement3D uie3D, bool oldValue)
{
// Before we fire the mouse event we need to figure if the notification is still relevant.
// This is because it is possible that the mouse state has changed during the previous
// property engine callout. Example: Consider a MessageBox being displayed during the
// IsMouseOver OnPropertyChanged override.
bool shouldFireNotification = false;
if (uie != null)
{
shouldFireNotification = (!oldValue && uie.IsMouseOver) || (oldValue && !uie.IsMouseOver);
}
else if (ce != null)
{
shouldFireNotification = (!oldValue && ce.IsMouseOver) || (oldValue && !ce.IsMouseOver);
}
else if (uie3D != null)
{
shouldFireNotification = (!oldValue && uie3D.IsMouseOver) || (oldValue && !uie3D.IsMouseOver);
}
if (shouldFireNotification)
{
MouseEventArgs mouseEventArgs = new MouseEventArgs(Mouse.PrimaryDevice, Environment.TickCount, Mouse.PrimaryDevice.StylusDevice);
mouseEventArgs.RoutedEvent = oldValue ? Mouse.MouseLeaveEvent : Mouse.MouseEnterEvent;
if (uie != null)
{
uie.RaiseEvent(mouseEventArgs);
}
else if (ce != null)
{
ce.RaiseEvent(mouseEventArgs);
}
else if (uie3D != null)
{
uie3D.RaiseEvent(mouseEventArgs);
}
}
}
}
}
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