Basic overlay layout implementation

osu.Game/Overlays/DashboardOverlay.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.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Overlays.Dashboard;
+
+namespace osu.Game.Overlays
+{
+    public class DashboardOverlay : FullscreenOverlay
+    {
+        private readonly Box background;
+        private readonly Container content;
+
+        public DashboardOverlay()
+            : base(OverlayColourScheme.Purple)
+        {
+            Children = new Drawable[]
+            {
+                background = new Box
+                {
+                    RelativeSizeAxes = Axes.Both
+                },
+                new OverlayScrollContainer
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    ScrollbarVisible = false,
+                    Child = new FillFlowContainer
+                    {
+                        AutoSizeAxes = Axes.Y,
+                        RelativeSizeAxes = Axes.X,
+                        Direction = FillDirection.Vertical,
+                        Children = new Drawable[]
+                        {
+                            new DashboardOverlayHeader
+                            {
+                                Anchor = Anchor.TopCentre,
+                                Origin = Anchor.TopCentre,
+                                Depth = -float.MaxValue
+                            },
+                            content = new Container
+                            {
+                                RelativeSizeAxes = Axes.X,
+                                AutoSizeAxes = Axes.Y
+                            }
+                        }
+                    }
+                },
+                new LoadingLayer(content),
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            background.Colour = ColourProvider.Background5;
+        }
+    }
+}