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osu-lazer/osu.Game/Screens/OnlinePlay/Components/ReadyButton.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.
using System;
using System.Linq;
using System.Linq.Expressions;
using osu.Framework.Allocation;
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using osu.Framework.Bindables;
using osu.Game.Beatmaps;
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using osu.Game.Graphics;
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using osu.Game.Graphics.UserInterface;
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using osu.Game.Online.Rooms;
namespace osu.Game.Screens.OnlinePlay.Components
{
public abstract class ReadyButton : TriangleButton
{
public readonly Bindable<PlaylistItem> SelectedItem = new Bindable<PlaylistItem>();
public new readonly BindableBool Enabled = new BindableBool();
[Resolved]
protected IBindable<WorkingBeatmap> GameBeatmap { get; private set; }
[Resolved]
private BeatmapManager beatmaps { get; set; }
private bool hasBeatmap;
private IBindable<WeakReference<BeatmapSetInfo>> managerUpdated;
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private IBindable<WeakReference<BeatmapSetInfo>> managerRemoved;
[BackgroundDependencyLoader]
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private void load(OsuColour colours)
{
managerUpdated = beatmaps.ItemUpdated.GetBoundCopy();
managerUpdated.BindValueChanged(beatmapUpdated);
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managerRemoved = beatmaps.ItemRemoved.GetBoundCopy();
managerRemoved.BindValueChanged(beatmapRemoved);
SelectedItem.BindValueChanged(item => updateSelectedItem(item.NewValue), true);
}
private void updateSelectedItem(PlaylistItem item)
{
hasBeatmap = findBeatmap(expr => beatmaps.QueryBeatmap(expr));
}
private void beatmapUpdated(ValueChangedEvent<WeakReference<BeatmapSetInfo>> weakSet)
{
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if (weakSet.NewValue.TryGetTarget(out var set))
{
if (findBeatmap(expr => set.Beatmaps.AsQueryable().FirstOrDefault(expr)))
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Schedule(() => hasBeatmap = true);
}
}
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private void beatmapRemoved(ValueChangedEvent<WeakReference<BeatmapSetInfo>> weakSet)
{
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if (weakSet.NewValue.TryGetTarget(out var set))
{
if (findBeatmap(expr => set.Beatmaps.AsQueryable().FirstOrDefault(expr)))
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Schedule(() => hasBeatmap = false);
}
}
private bool findBeatmap(Func<Expression<Func<BeatmapInfo, bool>>, BeatmapInfo> expression)
{
int? beatmapId = SelectedItem.Value?.Beatmap.Value?.OnlineBeatmapID;
string checksum = SelectedItem.Value?.Beatmap.Value?.MD5Hash;
if (beatmapId == null || checksum == null)
return false;
return expression(b => b.OnlineBeatmapID == beatmapId && b.MD5Hash == checksum) != null;
}
protected override void Update()
{
base.Update();
updateEnabledState();
}
private void updateEnabledState()
{
if (GameBeatmap.Value == null || SelectedItem.Value == null)
{
base.Enabled.Value = false;
return;
}
base.Enabled.Value = hasBeatmap && Enabled.Value;
}
}
}