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

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// 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.
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using System.Linq;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Framework.Screens;
namespace osu.Game.Graphics.UserInterface
{
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/// <summary>
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/// A <see cref="BreadcrumbControl{IScreen}"/> which follows the active screen (and allows navigation) in a <see cref="Screen"/> stack.
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/// </summary>
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public class ScreenBreadcrumbControl : BreadcrumbControl<IScreen>
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{
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public ScreenBreadcrumbControl(ScreenStack stack)
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{
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stack.ScreenPushed += onPushed;
stack.ScreenExited += onExited;
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if (stack.CurrentScreen != null)
onPushed(null, stack.CurrentScreen);
Current.ValueChanged += current => current.NewValue.MakeCurrent();
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}
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private void onPushed(IScreen lastScreen, IScreen newScreen)
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{
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AddItem(newScreen);
Current.Value = newScreen;
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}
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private void onExited(IScreen lastScreen, IScreen newScreen)
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{
if (newScreen != null)
Current.Value = newScreen;
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Items.ToList().SkipWhile(s => s != Current.Value).Skip(1).ForEach(RemoveItem);
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}
}
}