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Code Issues Releases Wiki Activity

Maintain a scroll position when scrolled to the bottom of a chat channel.

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Dean Herbert 2017-02-20 21:10:23 +09:00
parent 75b66871dd
commit 4afa434962
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GPG Key ID: 46D71BF4958ABB49
1 changed files with 23 additions and 5 deletions
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28
osu.Game/Online/Chat/Drawables/DrawableChannel.cs
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@ -52,7 +52,14 @@ namespace osu.Game.Online.Chat.Drawables
};
channel.NewMessagesArrived += newMessagesArrived;
}
protected override void LoadComplete()
{
base.LoadComplete();
newMessagesArrived(channel.Messages);
scrollToEnd();
}
protected override void Dispose(bool isDisposing)
@ -67,14 +74,25 @@ namespace osu.Game.Online.Chat.Drawables
var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MAX_HISTORY));
if (scroll.IsScrolledToEnd || !flow.Children.Any())
scrollToEnd();
//up to last Channel.MAX_HISTORY messages
foreach (Message m in displayMessages)
flow.Add(new ChatLine(m));
{
var d = new ChatLine(m);
flow.Add(d);
}
while (flow.Children.Count() > Channel.MAX_HISTORY)
flow.Remove(flow.Children.First());
scroll.ScrollTo(flow.DrawHeight, false);
while (flow.Children.Count(c => c.LifetimeEnd == double.MaxValue) > Channel.MAX_HISTORY)
{
var d = flow.Children.First(c => c.LifetimeEnd == double.MaxValue);
if (!scroll.IsScrolledToEnd)
scroll.OffsetScrollPosition(-d.DrawHeight);
d.Expire();
}
}
private void scrollToEnd() => Scheduler.AddDelayed(() => scroll.ScrollToEnd(), 50);
}
}