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

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// 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.
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#nullable disable
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
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using osu.Framework.Allocation;
using osu.Framework.Bindables;
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using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Graphics.Cursor;
using osu.Game.Online.Chat;
using osuTK.Graphics;
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namespace osu.Game.Overlays.Chat
{
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public class DrawableChannel : Container
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{
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public readonly Channel Channel;
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protected FillFlowContainer ChatLineFlow;
private ChannelScrollContainer scroll;
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private bool scrollbarVisible = true;
public bool ScrollbarVisible
{
set
{
if (scrollbarVisible == value) return;
scrollbarVisible = value;
if (scroll != null)
scroll.ScrollbarVisible = value;
}
}
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public DrawableChannel(Channel channel)
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{
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Channel = channel;
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RelativeSizeAxes = Axes.Both;
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}
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private Bindable<Message> highlightedMessage;
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[BackgroundDependencyLoader]
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private void load()
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{
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Child = new OsuContextMenuContainer
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{
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RelativeSizeAxes = Axes.Both,
Masking = true,
Child = scroll = new ChannelScrollContainer
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{
ScrollbarVisible = scrollbarVisible,
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RelativeSizeAxes = Axes.Both,
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// 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 },
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Child = ChatLineFlow = new FillFlowContainer
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{
Padding = new MarginPadding { Horizontal = 10 },
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RelativeSizeAxes = Axes.X,
AutoSizeAxes = Axes.Y,
Direction = FillDirection.Vertical,
}
},
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};
newMessagesArrived(Channel.Messages);
Channel.NewMessagesArrived += newMessagesArrived;
Channel.MessageRemoved += messageRemoved;
Channel.PendingMessageResolved += pendingMessageResolved;
}
protected override void LoadComplete()
{
base.LoadComplete();
highlightedMessage = Channel.HighlightedMessage.GetBoundCopy();
highlightedMessage.BindValueChanged(_ => processMessageHighlighting(), true);
}
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/// <summary>
/// Processes any pending message in <see cref="highlightedMessage"/>.
/// </summary>
// ScheduleAfterChildren is for ensuring the scroll flow has updated with any new chat lines.
private void processMessageHighlighting() => SchedulerAfterChildren.AddOnce(() =>
{
if (highlightedMessage.Value == null)
return;
var chatLine = chatLines.FirstOrDefault(c => c.Message.Equals(highlightedMessage.Value));
if (chatLine == null)
return;
float center = scroll.GetChildPosInContent(chatLine, chatLine.DrawSize / 2) - scroll.DisplayableContent / 2;
scroll.ScrollTo(Math.Clamp(center, 0, scroll.ScrollableExtent));
chatLine.Highlight();
highlightedMessage.Value = null;
});
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protected override void Dispose(bool isDisposing)
{
base.Dispose(isDisposing);
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Channel.NewMessagesArrived -= newMessagesArrived;
Channel.MessageRemoved -= messageRemoved;
Channel.PendingMessageResolved -= pendingMessageResolved;
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}
protected virtual ChatLine CreateChatLine(Message m) => new ChatLine(m);
protected virtual DaySeparator CreateDaySeparator(DateTimeOffset time) => new DaySeparator(time);
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private void newMessagesArrived(IEnumerable<Message> newMessages) => Schedule(() =>
{
if (newMessages.Min(m => m.Id) < chatLines.Max(c => c.Message.Id))
{
// there is a case (on initial population) that we may receive past messages and need to reorder.
// easiest way is to just combine messages and recreate drawables (less worrying about day separators etc.)
newMessages = newMessages.Concat(chatLines.Select(c => c.Message)).OrderBy(m => m.Id).ToList();
ChatLineFlow.Clear();
}
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// Add up to last Channel.MAX_HISTORY messages
var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - Channel.MAX_HISTORY));
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Message lastMessage = chatLines.LastOrDefault()?.Message;
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foreach (var message in displayMessages)
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{
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if (lastMessage == null || lastMessage.Timestamp.ToLocalTime().Date != message.Timestamp.ToLocalTime().Date)
ChatLineFlow.Add(CreateDaySeparator(message.Timestamp));
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ChatLineFlow.Add(CreateChatLine(message));
lastMessage = message;
}
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var staleMessages = chatLines.Where(c => c.LifetimeEnd == double.MaxValue).ToArray();
int count = staleMessages.Length - Channel.MAX_HISTORY;
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if (count > 0)
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{
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void expireAndAdjustScroll(Drawable d)
{
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scroll.OffsetScrollPosition(-d.DrawHeight);
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d.Expire();
}
for (int i = 0; i < count; i++)
expireAndAdjustScroll(staleMessages[i]);
// remove all adjacent day separators after stale message removal
for (int i = 0; i < ChatLineFlow.Count - 1; i++)
{
if (!(ChatLineFlow[i] is DaySeparator)) break;
if (!(ChatLineFlow[i + 1] is DaySeparator)) break;
expireAndAdjustScroll(ChatLineFlow[i]);
}
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}
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// 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 (newMessages.Any(m => m is LocalMessage))
scroll.ScrollToEnd();
processMessageHighlighting();
});
private void pendingMessageResolved(Message existing, Message updated) => Schedule(() =>
{
var found = chatLines.LastOrDefault(c => c.Message == existing);
if (found != null)
{
Trace.Assert(updated.Id.HasValue, "An updated message was returned with no ID.");
ChatLineFlow.Remove(found);
found.Message = updated;
ChatLineFlow.Add(found);
}
});
private void messageRemoved(Message removed) => Schedule(() =>
{
chatLines.FirstOrDefault(c => c.Message == removed)?.FadeColour(Color4.Red, 400).FadeOut(600).Expire();
});
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private IEnumerable<ChatLine> chatLines => ChatLineFlow.Children.OfType<ChatLine>();
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}
}