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

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C#
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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.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Online.Chat;
namespace osu.Game.Overlays.Chat
{
public class DrawableChannel : Container
{
public readonly Channel Channel;
private readonly FillFlowContainer flow;
private readonly ScrollContainer scroll;
public DrawableChannel(Channel channel)
{
Channel = channel;
RelativeSizeAxes = Axes.Both;
Children = new Drawable[]
{
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scroll = new ScrollContainer
{
RelativeSizeAxes = Axes.Both,
Children = new Drawable[]
{
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flow = new FillFlowContainer
{
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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;
}
protected override void LoadComplete()
{
base.LoadComplete();
newMessagesArrived(Channel.Messages);
scrollToEnd();
}
protected override void Dispose(bool isDisposing)
{
base.Dispose(isDisposing);
Channel.NewMessagesArrived -= newMessagesArrived;
}
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private void newMessagesArrived(IEnumerable<Message> newMessages)
{
if (!IsLoaded) return;
var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MAX_HISTORY));
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if (scroll.IsScrolledToEnd(10) || !flow.Children.Any())
scrollToEnd();
//up to last Channel.MAX_HISTORY messages
foreach (Message m in displayMessages)
{
var d = new ChatLine(m);
flow.Add(d);
}
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while (flow.Children.Count(c => c.LifetimeEnd == double.MaxValue) > Channel.MAX_HISTORY)
{
var d = flow.Children.First(c => c.LifetimeEnd == double.MaxValue);
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if (!scroll.IsScrolledToEnd(10))
scroll.OffsetScrollPosition(-d.DrawHeight);
d.Expire();
}
}
private void scrollToEnd() => Scheduler.AddDelayed(() => scroll.ScrollToEnd(), 50);
}
}