osu/osu.Game/Graphics/UserInterface/ScreenBreadcrumbControl.cs

40 lines
1.2 KiB
C#

// 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"/> 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);
}
}
}