private IHelpTextProvider FindHelpTextProvider(DependencyObject child)
{
IHelpTextProvider htp = WpfUtils.FindVisualParents <ButtonBase>(child)
.Where(n => n.Command is IHelpTextProvider)
.Where(n => (n.Command as IHelpTextProvider).Help != null)
.Select(n => n.Command as IHelpTextProvider).FirstOrDefault();
if (htp == null)
{
htp = WpfUtils.FindVisualParents <MenuItem>(child)
.Where(n => n.Command is IHelpTextProvider)
.Where(n => (n.Command as IHelpTextProvider).Help != null)
.Select(n => n.Command as IHelpTextProvider).FirstOrDefault();
}
if (htp == null)
{
htp = WpfUtils.FindVisualParents <FrameworkElement>(child)
.Where(n => n.DataContext is IHelpTextProvider)
.Where(n => (n.DataContext as IHelpTextProvider).Help != null)
.Select(n => n.DataContext as IHelpTextProvider).FirstOrDefault();
}
return(htp);
}
private void OnHelpTextProvider(IHelpTextProvider htp)
{
if (!Object.ReferenceEquals(htp, helpTextProvider))
{
helpTextProvider = htp;
if (Object.ReferenceEquals(dispatcherTimer, null))
{
dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 0, 100);
dispatcherTimer.Tick += new EventHandler(OnTimer);
dispatcherTimer.Start();
}
}
}
