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osu-lazer/osu.Game/Screens/OnlinePlay/Multiplayer/Participants/ParticipantsList.cs
Dean Herbert dea7f2308c Fix participant panels potentially keeping a reference to an old user
If a user leave and then rejoins a multiplayer match while another user
is not at the lobby screen, there is a potential the `ParticipantPanel`
tracking the user will not correctly be recreated to reference the new
instance of the `MultiplayerUser`.

This happens because the `OnRoomUpdated` call is scheduled, which means
it is not running in the background, coupled with the local logic that
relies on `IEquatable(MultiplayerRoomUser)` (which in turn falls back to
a UserID comparison).

Changing this to a reference comparison is the easiest way to resolve
this. Whether we change the `IEquatable` implementation is up for
discussion.

Closes https://github.com/ppy/osu/issues/15970.
2021-12-07 17:24:04 +09:00

94 lines
3.0 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.Allocation;
using osu.Framework.Audio;
using osu.Framework.Audio.Sample;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Graphics.Containers;
using osu.Game.Graphics.Cursor;
using osu.Game.Online.Multiplayer;
using osuTK;
namespace osu.Game.Screens.OnlinePlay.Multiplayer.Participants
{
public class ParticipantsList : MultiplayerRoomComposite
{
private FillFlowContainer<ParticipantPanel> panels;
private Sample userJoinSample;
private Sample userLeftSample;
private Sample userKickedSample;
[BackgroundDependencyLoader]
private void load(AudioManager audio)
{
InternalChild = new OsuContextMenuContainer
{
RelativeSizeAxes = Axes.Both,
Child = new OsuScrollContainer
{
RelativeSizeAxes = Axes.Both,
ScrollbarVisible = false,
Child = panels = new FillFlowContainer<ParticipantPanel>
{
RelativeSizeAxes = Axes.X,
AutoSizeAxes = Axes.Y,
Direction = FillDirection.Vertical,
Spacing = new Vector2(0, 2)
}
}
};
userJoinSample = audio.Samples.Get(@"Multiplayer/player-joined");
userLeftSample = audio.Samples.Get(@"Multiplayer/player-left");
userKickedSample = audio.Samples.Get(@"Multiplayer/player-kicked");
}
protected override void UserJoined(MultiplayerRoomUser user)
{
base.UserJoined(user);
userJoinSample?.Play();
}
protected override void UserLeft(MultiplayerRoomUser user)
{
base.UserLeft(user);
userLeftSample?.Play();
}
protected override void UserKicked(MultiplayerRoomUser user)
{
base.UserKicked(user);
userKickedSample?.Play();
}
protected override void OnRoomUpdated()
{
base.OnRoomUpdated();
if (Room == null)
panels.Clear();
else
{
// Remove panels for users no longer in the room.
foreach (var p in panels)
{
// Note that we *must* use reference equality here, as this call is scheduled and a user may have left and joined since it was last run.
if (Room.Users.All(u => !ReferenceEquals(p.User, u)))
p.Expire();
}
// Add panels for all users new to the room.
foreach (var user in Room.Users.Except(panels.Select(p => p.User)))
panels.Add(new ParticipantPanel(user));
}
}
}
}