private static void OnTargetPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DescriptionViewer dv = d as DescriptionViewer;
if (dv != null)
{
bool targetFocused = e.NewValue == FocusManager.GetFocusedElement();
if (dv.IsFocused != targetFocused)
{
dv.IsFocused = targetFocused;
}
dv.LoadMetadata(false);
FrameworkElement oldElement = e.OldValue as FrameworkElement;
FrameworkElement newElement = e.NewValue as FrameworkElement;
EventHandler <ValidationErrorEventArgs> bindingHandler = new EventHandler <ValidationErrorEventArgs>(dv.Target_BindingValidationError);
RoutedEventHandler gotFocusHandler = new RoutedEventHandler(dv.Target_GotFocus);
RoutedEventHandler lostFocusHandler = new RoutedEventHandler(dv.Target_LostFocus);
if (oldElement != null)
{
oldElement.BindingValidationError -= bindingHandler;
oldElement.GotFocus -= gotFocusHandler;
oldElement.LostFocus -= lostFocusHandler;
}
if (newElement != null)
{
newElement.BindingValidationError += bindingHandler;
newElement.GotFocus += gotFocusHandler;
newElement.LostFocus += lostFocusHandler;
}
dv.ParseTargetValidState();
}
}
private static void OnPropertyPathPropertyChanged(DependencyObject depObj, DependencyPropertyChangedEventArgs e)
{
DescriptionViewer dv = depObj as DescriptionViewer;
if (dv != null && dv.Initialized)
{
dv.LoadMetadata(false);
// Changing the PropertyPath sometimes requires an update for the validation state, since it might be stale.
dv.ParseTargetValidState();
}
}
private static void OnDataContextPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DescriptionViewer dv = d as DescriptionViewer;
if (dv != null)
{
if (e.OldValue == null || e.NewValue == null || e.OldValue.GetType() != e.NewValue.GetType())
{
// Refresh the metadata, but only if the DataContext's type has changed (or if either is null)
dv.LoadMetadata(false);
}
}
}