From 8e014ca17ad6bab674db6076e5c0c2bb0eee3c19 Mon Sep 17 00:00:00 2001
From: Dan Balasescu <smoogipoo@smgi.me>
Date: Tue, 16 Nov 2021 00:09:38 +0900
Subject: [PATCH] Reverse in-match playlist

---
 .../OnlinePlay/DrawableRoomPlaylist.cs        | 25 ++++++++++++++++---
 .../Multiplayer/MultiplayerMatchSubScreen.cs  |  2 +-
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/osu.Game/Screens/OnlinePlay/DrawableRoomPlaylist.cs b/osu.Game/Screens/OnlinePlay/DrawableRoomPlaylist.cs
index a08d9edb34..296bb4bea5 100644
--- a/osu.Game/Screens/OnlinePlay/DrawableRoomPlaylist.cs
+++ b/osu.Game/Screens/OnlinePlay/DrawableRoomPlaylist.cs
@@ -19,10 +19,12 @@ namespace osu.Game.Screens.OnlinePlay
         private readonly bool allowEdit;
         private readonly bool allowSelection;
 
-        public DrawableRoomPlaylist(bool allowEdit, bool allowSelection)
+        public DrawableRoomPlaylist(bool allowEdit, bool allowSelection, bool reverse = false)
         {
             this.allowEdit = allowEdit;
             this.allowSelection = allowSelection;
+
+            ((ReversibleFillFlowContainer)ListContainer).Reverse = reverse;
         }
 
         protected override void LoadComplete()
@@ -47,10 +49,8 @@ namespace osu.Game.Screens.OnlinePlay
             d.ScrollbarVisible = false;
         });
 
-        protected override FillFlowContainer<RearrangeableListItem<PlaylistItem>> CreateListFillFlowContainer() => new FillFlowContainer<RearrangeableListItem<PlaylistItem>>
+        protected override FillFlowContainer<RearrangeableListItem<PlaylistItem>> CreateListFillFlowContainer() => new ReversibleFillFlowContainer
         {
-            LayoutDuration = 200,
-            LayoutEasing = Easing.OutQuint,
             Spacing = new Vector2(0, 2)
         };
 
@@ -72,5 +72,22 @@ namespace osu.Game.Screens.OnlinePlay
 
             Items.Remove(item);
         }
+
+        private class ReversibleFillFlowContainer : FillFlowContainer<RearrangeableListItem<PlaylistItem>>
+        {
+            private bool reverse;
+
+            public bool Reverse
+            {
+                get => reverse;
+                set
+                {
+                    reverse = value;
+                    Invalidate();
+                }
+            }
+
+            public override IEnumerable<Drawable> FlowingChildren => Reverse ? base.FlowingChildren.OrderBy(d => -GetLayoutPosition(d)) : base.FlowingChildren;
+        }
     }
 }
diff --git a/osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerMatchSubScreen.cs b/osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerMatchSubScreen.cs
index 9e689773af..c99367851a 100644
--- a/osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerMatchSubScreen.cs
+++ b/osu.Game/Screens/OnlinePlay/Multiplayer/MultiplayerMatchSubScreen.cs
@@ -154,7 +154,7 @@ namespace osu.Game.Screens.OnlinePlay.Multiplayer
                                 null,
                                 new Drawable[]
                                 {
-                                    playlist = new DrawableRoomPlaylist(false, false)
+                                    playlist = new DrawableRoomPlaylist(false, false, true)
                                     {
                                         RelativeSizeAxes = Axes.Both,
                                     },