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osu-lazer/osu.Game/Overlays/Chat/DrawableChannel.cs

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// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Graphics.Containers;
using osu.Game.Online.Chat;
namespace osu.Game.Overlays.Chat
{
public class DrawableChannel : Container
{
public readonly Channel Channel;
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private readonly FillFlowContainer<ChatLine> flow;
private readonly ScrollContainer scroll;
public DrawableChannel(Channel channel)
{
Channel = channel;
RelativeSizeAxes = Axes.Both;
Children = new Drawable[]
{
scroll = new OsuScrollContainer
{
RelativeSizeAxes = Axes.Both,
// Some chat lines have effects that slightly protrude to the bottom,
// which we do not want to mask away, hence the padding.
Padding = new MarginPadding { Bottom = 5 },
Children = new Drawable[]
{
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flow = new FillFlowContainer<ChatLine>
{
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Direction = FillDirection.Vertical,
RelativeSizeAxes = Axes.X,
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AutoSizeAxes = Axes.Y,
Padding = new MarginPadding { Left = 20, Right = 20 }
}
}
}
};
channel.NewMessagesArrived += newMessagesArrived;
}
[BackgroundDependencyLoader]
private void load()
{
newMessagesArrived(Channel.Messages);
}
protected override void LoadComplete()
{
base.LoadComplete();
scrollToEnd();
}
protected override void Dispose(bool isDisposing)
{
base.Dispose(isDisposing);
Channel.NewMessagesArrived -= newMessagesArrived;
}
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private void newMessagesArrived(IEnumerable<Message> newMessages)
{
var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MAX_HISTORY));
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//up to last Channel.MAX_HISTORY messages
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flow.AddRange(displayMessages.Select(m => new ChatLine(m)));
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if (!IsLoaded) return;
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if (scroll.IsScrolledToEnd(10) || !flow.Children.Any())
scrollToEnd();
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var staleMessages = flow.Children.Where(c => c.LifetimeEnd == double.MaxValue).ToArray();
int count = staleMessages.Length - Channel.MAX_HISTORY;
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for (int i = 0; i < count; i++)
{
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var d = staleMessages[i];
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if (!scroll.IsScrolledToEnd(10))
scroll.OffsetScrollPosition(-d.DrawHeight);
d.Expire();
}
}
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private void scrollToEnd() => ScheduleAfterChildren(() => scroll.ScrollToEnd());
}
}