public XboxSongHistoryPage()
{
this.InitializeComponent();
long itemsSourceHandler = 0;
itemsSourceHandler = SongHistoryListView.RegisterPropertyChangedCallback(GridView.ItemsSourceProperty, new DependencyPropertyChangedCallback(async(obj, dp) =>
{
IEnumerable <object> collection = obj.GetValue(dp) as IEnumerable <object>;
if (collection != null)
{
//try and force focus on the first item when we load this page.
SongHistoryListView.UnregisterPropertyChangedCallback(GridView.ItemsSourceProperty, itemsSourceHandler);
if (collection.Count() == 0)
{
return;
}
//wait until we can get an item from the song history list view to focus. this is a hack but it'll have to do.
ListViewItem firstItem = null;
do
{
firstItem = (ListViewItem)SongHistoryListView.ContainerFromIndex(0);
await Task.Delay(50);
} while (firstItem == null);
firstItem.Focus(FocusState.Keyboard);
SongHistoryListView.SelectedIndex = 0;
}
}));
}
public void PreserveFocus()
{
var selection = SongHistoryListView.SelectedItem;
if (selection != null)
{
focusedItem = (ListViewItem)SongHistoryListView.ContainerFromItem(selection);
}
}