Add empty RoomSettingsOverlay.

osu.Game/Screens/Multi/Screens/Match/RoomSettingsOverlay.cs

@@ -0,0 +1,51 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Containers;
+
+namespace osu.Game.Screens.Multi.Screens.Match
+{
+    public class RoomSettingsOverlay : OsuFocusedOverlayContainer
+    {
+        private const float transition_duration = 500;
+
+        private readonly Container content;
+
+        protected override Container<Drawable> Content => content;
+
+        public RoomSettingsOverlay()
+        {
+            InternalChild = content = new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                RelativePositionAxes = Axes.Y,
+                Children = new Drawable[]
+                {
+                    new Box
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Colour = OsuColour.FromHex(@"28242d"),
+                    },
+                },
+            };
+        }
+
+        protected override void PopIn()
+        {
+            base.PopIn();
+
+            Content.MoveToY(0, transition_duration, Easing.OutSine);
+        }
+
+        protected override void PopOut()
+        {
+            base.PopOut();
+
+            Content.MoveToY(-1, transition_duration, Easing.InSine);
+        }
+    }
+}