/// <summary>
/// Update the favorite list, attaching all required event handlers.
/// We will load favorites from isolated storage, on the state of the
/// input parameter
/// </summary>
/// <param name="favoritesListView">List view for the favorites</param>
/// <param name="favoritesNoItems">Text block for the favorites</param>
internal void UpdateFavoriteList(
ListBox favoritesListView,
TextBlock favoritesNoItems)
{
FavoriteCollection favCollection = ApplicationState.Favorites == null ?
favCollection = FavoriteCollection.LoadFromFile() : ApplicationState.Favorites;
if (favCollection.Count > 0)
{
// show listbox, hide no favorites label
favoritesListView.Visibility = Visibility.Visible;
favoritesNoItems.Visibility = Visibility.Collapsed;
favoritesListView.ItemsSource = favCollection;
}
else
{
// hide listbox, show no favorites label
favoritesListView.Visibility = Visibility.Collapsed;
favoritesNoItems.Visibility = Visibility.Visible;
}
// We need to instal these handlers in the order below to be sure they don't get
// eaten by the ListView control
this.lastSelectedFavorite = null;
}
/// <summary>
/// Background thread work for loading
/// The loading of the supported conversions from the Xap as well as the
/// favorites from isolated storage is done on a non UI thread to allow the
/// fastest possible page render
/// </summary>
/// <param name="sender">worker thread object</param>
/// <param name="e">Action delegate for completion</param>
private void DeferStartupWork(object sender, DoWorkEventArgs e)
{
Action completed = e.Argument as Action;
lock (threadLock)
{
ApplicationState.AppLaunchInitialization();
this.SetDefaultCategoryAndUnits();
ApplicationState.Favorites =
FavoriteCollection.LoadFromFile() ?? new FavoriteCollection();
}
if (completed != null)
{
completed();
}
}