/// <summary>
/// Handle the Loaded event of the element to which this view model is attached
/// in order to enable the attached
/// view model to bind to properties of the parent element
/// </summary>
static void Element_Loaded(object sender, RoutedEventArgs e)
{
FrameworkElement targetElement = sender as FrameworkElement;
CircularProgressBarViewModel attachedModel = GetAttach(targetElement);
// find the ProgressBar and associated it with the view model
var progressBar = targetElement.Ancestors <ProgressBar>().Single() as ProgressBar;
attachedModel.SetProgressBar(progressBar);
}
/// <summary>
/// Change handler for the Attach property
/// </summary>
private static void OnAttachChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
// set the view model as the DataContext for the rest of the template
FrameworkElement targetElement = d as FrameworkElement;
CircularProgressBarViewModel viewModel = e.NewValue as CircularProgressBarViewModel;
targetElement.DataContext = viewModel;
// handle the loaded event
targetElement.Loaded += new RoutedEventHandler(Element_Loaded);
}
public static void SetAttach(DependencyObject d, CircularProgressBarViewModel value)
{
d.SetValue(AttachProperty, value);
}