private static IntPtr HwndSource_MessageHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case 7:
{
HwndSource hwndSource = HwndSource.FromHwnd(hwnd);
FocusHelper.ClearRestoreFocusWindowIf(hwndSource, (IntPtr currentValue) => !HwndSourceTracker.IsValidRestoreFocusWindowForSource(hwndSource, currentValue));
break;
}
case 8:
{
if (!HwndSourceTracker.IsNonChildDescendant(wParam, hwnd))
{
break;
}
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Normal, new DispatcherOperationCallback((object oFocusedKeyboardElement) =>
{
FocusHelper.SetRestoreFocusFields(HwndSource.FromHwnd(hwnd), oFocusedKeyboardElement, IntPtr.Zero);
return(null);
}), Keyboard.FocusedElement);
break;
}
}
return(IntPtr.Zero);
}
private void StartHwndSourceTracking()
{
this.StopHwndSourceTracking();
if (this._hwndSource != null)
{
this._hwndSourceTracker = HwndSourceTracker.AddSource(this._hwndSource);
}
}
protected override void DisposeManagedResources()
{
HwndSourceTracker.RemoveSource(this.Source);
}
// <HwndSource_MessageHook>b__1
public bool u003cHwndSource_MessageHooku003eb__1(IntPtr currentValue)
{
return(!HwndSourceTracker.IsValidRestoreFocusWindowForSource(this.source, currentValue));
}
