// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence. // See the LICENCE file in the repository root for full licence text. using System.Linq; using osu.Framework.Extensions.IEnumerableExtensions; using osu.Framework.Screens; namespace osu.Game.Graphics.UserInterface { /// <summary> /// A <see cref="BreadcrumbControl{IScreen}"/> which follows the active screen (and allows navigation) in a <see cref="Screen"/> stack. /// </summary> public class ScreenBreadcrumbControl : BreadcrumbControl<IScreen> { public ScreenBreadcrumbControl(ScreenStack stack) { stack.ScreenPushed += onPushed; stack.ScreenExited += onExited; onPushed(null, stack.CurrentScreen); Current.ValueChanged += current => current.NewValue.MakeCurrent(); } private void onPushed(IScreen lastScreen, IScreen newScreen) { AddItem(newScreen); Current.Value = newScreen; } private void onExited(IScreen lastScreen, IScreen newScreen) { if (newScreen != null) Current.Value = newScreen; Items.ToList().SkipWhile(s => s != Current.Value).Skip(1).ForEach(RemoveItem); } } }