/// <summary>
/// Invoked when the effective property value of the ItemsSource property changes.
/// </summary>
/// <param name="dependencyObject">The DependencyObject on which the property has changed value.</param>
/// <param name="dependencyPropertyChangedEventArgs">Event data that is issued by any event that tracks changes to the effective value of this
/// property.</param>
static void OnItemsSourcePropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
// Extract the event arguments.
DetailBar detailBar = (DetailBar)dependencyObject;
IEnumerable newValue = (IEnumerable)dependencyPropertyChangedEventArgs.NewValue;
// The ItemsSource can be cleared by setting the property to 'null' (and providing it's not data bound). Otherwise this handler will set the
// source of the internal collection to use the supplied collection.
if (dependencyPropertyChangedEventArgs.NewValue == null && !BindingOperations.IsDataBound(dependencyObject, DetailBar.ItemsSourceProperty))
{
detailBar.items.ClearItemsSource();
}
else
{
detailBar.items.ItemsSource = newValue;
}
}
/// <summary>
/// Handles the changing of the data context.
/// </summary>
/// <param name="sender">The object that originated the event.</param>
/// <param name="dependencyPropertyChangedEventArgs">The event data.</param>
void OnDataContextChanged(Object sender, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
// If the data context for this item is an ExplorerItem, we can set the common elements that appear in the DetailBar for all ExplorerItems.
IExplorerItem iExplorerItem = dependencyPropertyChangedEventArgs.NewValue as IExplorerItem;
if (iExplorerItem != null)
{
// This will set the image according to how much space is available in the DetailBar.
this.SetImage();
// Clear out whatever was previously in the DetailBar and present the item's name and type.
this.commonMetadata.Clear();
this.commonMetadata.Add(DetailBar.CreateMetadataText(iExplorerItem.Name, Brushes.Black, 13.33, new Thickness(0), TextAlignment.Left));
this.commonMetadata.Add(
DetailBar.CreateMetadataText(iExplorerItem.TypeDescription, DetailBar.labelBrush, 12.0, new Thickness(0, 1, 0, 1), TextAlignment.Left));
}
}
