private static UserControl CreateNewScreen(ScreenViewModel vm)
{
if (vm is BoardsListingModel)
{
return new BoardsListing((BoardsListingModel)vm);
}
else if (vm is BoardCatalogModel)
{
return new BoardCatalog((BoardCatalogModel)vm);
}
else if (vm is ThreadViewModel)
{
return new ThreadPage((ThreadViewModel)vm);
}
else if (vm is ThreadImageModel)
{
return new ThreadImageScreen((ThreadImageModel)vm);
}
else if (vm is Settings.SettingsScreenModel)
{
return new Settings.SettingsScreen((Settings.SettingsScreenModel)vm);
}
throw new Exception("Unknown view model!");
}
public override void CloseScreen(ScreenViewModel screen)
{
if (screen == BoardsScreen)
return;
base.CloseScreen(screen);
}
public ScreenRemovedArgs(ScreenViewModel screen)
{
Screen = screen;
}
public CurrentScreenChangedArgs(ScreenViewModel previous, ScreenViewModel current)
{
Previous = previous;
Current = current;
}
private UserControl GetViewForViewModel(ScreenViewModel vm)
{
UserControl view;
if (!_screenViews.TryGetValue(vm, out view))
{
view = CreateNewScreen(vm);
_screenViews.Add(vm, view);
}
return view;
}
private void DisplayScreen(ScreenViewModel vm)
{
var view = GetViewForViewModel(vm);
ContentContainer.Children.Clear();
ContentContainer.Children.Add(view);
}