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Code Issues Releases Wiki Activity

Improve robustness of chat auto-scrolling logic

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Fix auto-scrolling state changing by old messages removal logic
This commit is contained in:
Salman Ahmed 2021-01-31 23:37:52 +03:00
parent 39d46d21e6
commit e806e5bcd1
1 changed files with 33 additions and 14 deletions
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47
osu.Game/Overlays/Chat/DrawableChannel.cs
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@ -24,7 +24,7 @@ namespace osu.Game.Overlays.Chat
{
public readonly Channel Channel;
protected FillFlowContainer ChatLineFlow;
private OsuScrollContainer scroll;
private ChannelScrollContainer scroll;
private bool scrollbarVisible = true;
@ -56,7 +56,7 @@ namespace osu.Game.Overlays.Chat
{
RelativeSizeAxes = Axes.Both,
Masking = true,
Child = scroll = new OsuScrollContainer
Child = scroll = new ChannelScrollContainer
{
ScrollbarVisible = scrollbarVisible,
RelativeSizeAxes = Axes.Both,
@ -80,12 +80,6 @@ namespace osu.Game.Overlays.Chat
Channel.PendingMessageResolved += pendingMessageResolved;
}
protected override void LoadComplete()
{
base.LoadComplete();
scrollToEnd();
}
protected override void Dispose(bool isDisposing)
{
base.Dispose(isDisposing);
@ -113,8 +107,6 @@ namespace osu.Game.Overlays.Chat
ChatLineFlow.Clear();
}
bool shouldScrollToEnd = scroll.IsScrolledToEnd(10) || !chatLines.Any() || newMessages.Any(m => m is LocalMessage);
// Add up to last Channel.MAX_HISTORY messages
var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MAX_HISTORY));
@ -153,8 +145,10 @@ namespace osu.Game.Overlays.Chat
}
}
if (shouldScrollToEnd)
scrollToEnd();
// due to the scroll adjusts from old messages removal above, a scroll-to-end must be enforced,
// to avoid making the container think the user has scrolled back up and unwantedly disable auto-scrolling.
if (scroll.ShouldAutoScroll || newMessages.Any(m => m is LocalMessage))
ScheduleAfterChildren(() => scroll.ScrollToEnd());
});
private void pendingMessageResolved(Message existing, Message updated) => Schedule(() =>
@ -178,8 +172,6 @@ namespace osu.Game.Overlays.Chat
private IEnumerable<ChatLine> chatLines => ChatLineFlow.Children.OfType<ChatLine>();
private void scrollToEnd() => ScheduleAfterChildren(() => scroll.ScrollToEnd());
public class DaySeparator : Container
{
public float TextSize
@ -243,5 +235,32 @@ namespace osu.Game.Overlays.Chat
};
}
}
/// <summary>
/// An <see cref="OsuScrollContainer"/> with functionality to automatically scrolls whenever the maximum scrollable distance increases.
/// </summary>
private class ChannelScrollContainer : OsuScrollContainer
{
private const float auto_scroll_leniency = 10f;
private float? lastExtent;
/// <summary>
/// Whether this should automatically scroll to end on the next call to <see cref="UpdateAfterChildren"/>.
/// </summary>
public bool ShouldAutoScroll { get; private set; } = true;
protected override void UpdateAfterChildren()
{
base.UpdateAfterChildren();
if ((lastExtent == null || ScrollableExtent > lastExtent) && ShouldAutoScroll)
ScrollToEnd();
else
ShouldAutoScroll = IsScrolledToEnd(auto_scroll_leniency);
lastExtent = ScrollableExtent;
}
}
}
}