private static void _ChangeState(CollapsiblePanel panel, string goToState, string stateStoryboardName)
{
if (panel != null && goToState != null)
{
VisualStateManager.GoToState((panel as Control), goToState, true);
}
if (stateStoryboardName != null)
{
Storyboard sb = (panel as FrameworkElement).Resources[stateStoryboardName] as Storyboard;
if (sb != null)
{
sb.Begin();
}
}
}
private static void IsExpandedChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
bool expanded = (bool)e.NewValue;
CollapsiblePanel panel = o as CollapsiblePanel;
if (panel != null)
{
if (expanded)
{
_ChangeState(panel, Expand, panel._RollDownStoryboardName);
}
else
{
_ChangeState(panel, Collapse, panel._RollUpStoryboardName);
}
}
}
