/// <summary>
/// SelectedProperty PropertyChangedCallback static function.
/// </summary>
/// <param name="d">Expander object whose Expanded property is changed.</param>
/// <param name="e">
/// DependencyPropertyChangedEventArgs which contains the
/// old and new values.
/// </param>
private static void OnIsSelectedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var ctrl = (AccordionItem)d;
var isSelected = (bool)e.NewValue;
// Not allowed to change the IsSelected state when locked.
if (ctrl.IsLocked && ctrl._isSelectedNestedLevel == 0)
{
ctrl._isSelectedNestedLevel++;
ctrl.SetValue(IsSelectedProperty, e.OldValue);
ctrl._isSelectedNestedLevel--;
throw new InvalidOperationException(
Properties.Resources.AccordionItem_OnIsSelectedPropertyChanged_InvalidChange);
}
if (ctrl._isSelectedNestedLevel == 0)
{
Accordion parent = ctrl.ParentAccordion;
if (parent != null)
{
if (isSelected)
{
parent.OnAccordionItemSelected(ctrl);
}
else
{
parent.OnAccordionItemUnselected(ctrl);
}
}
if (isSelected)
{
ctrl.OnSelected();
}
else
{
ctrl.OnUnselected();
}
}
}