osu-lazer/osu.Game/Screens/OnlinePlay/Components/ReadyButton.cs

// 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 osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Game.Graphics.UserInterface;
using osu.Game.Online;
using osu.Game.Online.Rooms;

namespace osu.Game.Screens.OnlinePlay.Components
{
    public abstract class ReadyButton : TriangleButton
    {
        public new readonly BindableBool Enabled = new BindableBool();

        private IBindable<BeatmapAvailability> availability;

        [BackgroundDependencyLoader]
        private void load(OnlinePlayBeatmapAvailablilityTracker beatmapTracker)
        {
            availability = beatmapTracker.Availability.GetBoundCopy();

            availability.BindValueChanged(_ => updateState());
            Enabled.BindValueChanged(_ => updateState(), true);
        }

        private void updateState() => base.Enabled.Value = availability.Value.State == DownloadState.LocallyAvailable && Enabled.Value;
    }
}