private void ButtonsSourceCollectionChanged(
object sender, NotifyCollectionChangedEventArgs e)
{
if (e.OldItems != null)
{
foreach (var buttonSource in e.OldItems)
{
// Copy item reference to prevent access to modified closure
var dataContext = buttonSource;
var button =
this.buttonsSourceButtons.FirstOrDefault(
b => b.DataContext == dataContext);
if (button != null)
{
this.buttonsSourceButtons.Remove(button);
}
}
}
if (this.ButtonsSource != null &&
this.ButtonTemplate != null &&
e.NewItems != null)
{
foreach (var buttonSource in e.NewItems)
{
var button = (BindableApplicationBarButton)
this.ButtonTemplate.LoadContent();
if (button == null)
{
throw new InvalidOperationException(
"BindableApplicationBar cannot use the ButtonsSource property without a valid ButtonTemplate");
}
button.DataContext = buttonSource;
this.buttonsSourceButtons.Add(button);
}
}
}
#endregion
