public Task AddOrUpdateScreen(IInternalScreen internalScreen)
{
var predicateScreen = new Predicate <IInternalScreen>((screen) => screen.Id == internalScreen.Id);
var internalScreenFound = InternalScreens.Find(predicateScreen);
if (internalScreenFound != null)
{
UpdateScreen(internalScreenFound, internalScreen);
}
else
{
InternalScreens.Add(internalScreen);
InternalScreensById[internalScreen.Id] = internalScreen;
}
return(Task.CompletedTask);
}
public Task ChangeOrder(IEnumerable <IScreen> screens)
{
var screensToOrder = screens
.Select(screen => screen as IInternalScreen)
.Where(screen => screen != null)
.Where(screen => InternalScreensById.ContainsKey(screen.Id))
;
var screensToOrderIds = new HashSet <string>(screensToOrder.Select(screen => screen.Id));
var remainingScreens = InternalScreens.Where(screen => !screensToOrderIds.Contains(screen.Id));
int index = 0;
foreach (var screen in screensToOrder.Concat(remainingScreens))
{
(InternalScreensById[screen.Id] as IModifiableScreen).Index = index;
index++;
}
return(Task.CompletedTask);
}
