async protected override void OnNavigatedTo(NavigationEventArgs e)
{
DeviceClassTitle.Text = "";
foreach (Type ty in classes)
{
if (DeviceClassTitle.Text.Length > 0)
{
DeviceClassTitle.Text += ", ";
}
DeviceClassTitle.Text += SelectDeviceClass.ShortClassName(ty);
}
preferredDeviceName = MainPage.Current.PreferredDeviceName;
PreferredItemBox.Text = DeviceInfoToDisplayName();
// optionally wait on list to be built out, if not watchers yet
if (PosDeviceWatchers.PosWatchers == null)
{
BusySignal.IsActive = true;
await CreateDeviceList_OneTime(classes);
BusySignal.IsActive = false;
}
// setup of watchers to add/delete/update list
PosDeviceWatchers.CombinedWatcherCallback = new DeviceClassWatcherCallbackRoutine(SelectionList);
}
public static async void ListUpdate(CoreDispatcher coreDispatcher, ListOperation oper, Type ty, DeviceInformation deviceInfo = null, string Id = null, string Name = null)
{
if (SelectionList == null)
{
return;
}
await coreDispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
if (SelectionList == null)
{
return;
}
switch (oper)
{
case ListOperation.Add:
SelectDeviceClass sdc = new SelectDeviceClass();
sdc.DeviceClass = ty;
sdc.DeviceName = deviceInfo.Name;
sdc.DeviceId = deviceInfo.Id;
SelectionList.Add(sdc);
break;
case ListOperation.Delete:
for (int index = 0; index < SelectionList.Count; ++index)
{
if (SelectionList[index].DeviceId == Id)
{
SelectionList.RemoveAt(index);
break;
}
}
break;
case ListOperation.Update:
for (int index = 0; index < SelectionList.Count; ++index)
{
if (SelectionList[index].DeviceId == Id)
{
// TBD
break;
}
}
break;
}
});
}
void AddToSelectionList(Type ty, DeviceInformationCollection collection)
{
if (SelectionList == null)
{
SelectionList = new ObservableCollection <SelectDeviceClass>();
}
if (collection != null)
{
foreach (DeviceInformation di in collection)
{
SelectDeviceClass sdc = new SelectDeviceClass();
sdc.DeviceClass = ty;
sdc.DeviceName = di.Name;
sdc.DeviceId = di.Id;
SelectionList.Add(sdc);
}
}
}
