Make the settings sidebar optional

Also removes an unnecessary secondary list of SidebarButtons by using generic containers.

osu.Game/Overlays/MainSettings.cs

@@ -25,5 +25,9 @@ namespace osu.Game.Overlays
 
         protected override Drawable CreateHeader() => new SettingsHeader("settings", "Change the way osu! behaves");
         protected override Drawable CreateFooter() => new SettingsFooter();
+
+        public MainSettings() : base(true)
+        {
+        }
     }
 }

osu.Game/Overlays/Settings/SettingsSection.cs

@@ -7,7 +7,6 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
-using osu.Framework.Graphics.Sprites;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using System.Collections.Generic;
@@ -25,25 +24,38 @@ namespace osu.Game.Overlays.Settings
 
         public IEnumerable<IFilterable> FilterableChildren => Children.OfType<IFilterable>();
         public string[] FilterTerms => new[] { Header };
+
+        private const int header_size = 26;
+        private const int header_margin = 25;
+        private const int border_size = 2;
+
         public bool MatchingFilter
         {
-            set
+            set { this.FadeTo(value ? 1 : 0); }
-            {
-                this.FadeTo(value ? 1 : 0);
-            }
         }
 
-        private readonly SpriteText headerLabel;
-
         protected SettingsSection()
         {
             Margin = new MarginPadding { Top = 20 };
             AutoSizeAxes = Axes.Y;
             RelativeSizeAxes = Axes.X;
 
-            const int header_size = 26;
+            FlowContent = new FillFlowContainer
-            const int header_margin = 25;
+            {
-            const int border_size = 2;
+                Margin = new MarginPadding
+                {
+                    Top = header_size + header_margin
+                },
+                Direction = FillDirection.Vertical,
+                Spacing = new Vector2(0, 30),
+                AutoSizeAxes = Axes.Y,
+                RelativeSizeAxes = Axes.X,
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
             AddRangeInternal(new Drawable[]
             {
                 new Box
@@ -65,28 +77,16 @@ namespace osu.Game.Overlays.Settings
                     AutoSizeAxes = Axes.Y,
                     Children = new[]
                     {
-                        headerLabel = new OsuSpriteText
+                        new OsuSpriteText
                         {
                             TextSize = header_size,
                             Text = Header,
+                            Colour = colours.Yellow
                         },
-                        FlowContent = new FillFlowContainer
+                        FlowContent
-                        {
-                            Margin = new MarginPadding { Top = header_size + header_margin },
-                            Direction = FillDirection.Vertical,
-                            Spacing = new Vector2(0, 30),
-                            AutoSizeAxes = Axes.Y,
-                            RelativeSizeAxes = Axes.X,
-                        },
                     }
                 },
             });
         }
-
-        [BackgroundDependencyLoader]
-        private void load(OsuColour colours)
-        {
-            headerLabel.Colour = colours.Yellow;
-        }
     }
-}
+}

osu.Game/Overlays/Settings/Sidebar.cs

@@ -14,12 +14,12 @@ using osu.Game.Overlays.Toolbar;
 
 namespace osu.Game.Overlays.Settings
 {
-    public class Sidebar : Container, IStateful<ExpandedState>
+    public class Sidebar : Container<SidebarButton>, IStateful<ExpandedState>
     {
-        private readonly FillFlowContainer content;
+        private readonly FillFlowContainer<SidebarButton> content;
         internal const float DEFAULT_WIDTH = ToolbarButton.WIDTH;
         internal const int EXPANDED_WIDTH = 200;
-        protected override Container<Drawable> Content => content;
+        protected override Container<SidebarButton> Content => content;
 
         public Sidebar()
         {
@@ -35,7 +35,7 @@ namespace osu.Game.Overlays.Settings
                 {
                     Children = new[]
                     {
-                        content = new FillFlowContainer
+                        content = new FillFlowContainer<SidebarButton>
                         {
                             Origin = Anchor.CentreLeft,
                             Anchor = Anchor.CentreLeft,

osu.Game/Overlays/SettingsOverlay.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Linq;
 using OpenTK.Graphics;
 using osu.Framework.Allocation;
+using osu.Framework.Extensions.IEnumerableExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Shapes;
@@ -29,7 +30,6 @@ namespace osu.Game.Overlays
         private const float sidebar_padding = 10;
 
         private Sidebar sidebar;
-        private SidebarButton[] sidebarButtons;
         private SidebarButton selectedSidebarButton;
 
         private SettingsSectionsContainer sectionsContainer;
@@ -38,19 +38,20 @@ namespace osu.Game.Overlays
 
         private Func<float> getToolbarHeight;
 
-        protected SettingsOverlay()
+        private readonly bool showSidebar;
+
+        protected SettingsOverlay(bool showSidebar)
         {
+            this.showSidebar = showSidebar;
             RelativeSizeAxes = Axes.Y;
             AutoSizeAxes = Axes.X;
         }
 
-        protected abstract IEnumerable<SettingsSection> CreateSections();
+        protected virtual IEnumerable<SettingsSection> CreateSections() => null;
 
         [BackgroundDependencyLoader(permitNulls: true)]
         private void load(OsuGame game)
         {
-            var sections = CreateSections().ToList();
-
             Children = new Drawable[]
             {
                 new Box
@@ -78,39 +79,53 @@ namespace osu.Game.Overlays
                         },
                         Exit = Hide,
                     },
-                    Children = sections,
                     Footer = CreateFooter()
-                },
-                sidebar = new Sidebar
-                {
-                    Width = SIDEBAR_WIDTH,
-                    Children = sidebarButtons = sections.Select(section =>
-                        new SidebarButton
-                        {
-                            Section = section,
-                            Action = s =>
-                            {
-                                sectionsContainer.ScrollTo(s);
-                                sidebar.State = ExpandedState.Contracted;
-                            },
-                        }
-                    ).ToArray()
                 }
             };
 
-            selectedSidebarButton = sidebarButtons[0];
+            if (showSidebar)
-            selectedSidebarButton.Selected = true;
-
-            sectionsContainer.SelectedSection.ValueChanged += section =>
             {
-                selectedSidebarButton.Selected = false;
+                Add(sidebar = new Sidebar { Width = SIDEBAR_WIDTH });
-                selectedSidebarButton = sidebarButtons.Single(b => b.Section == section);
+
-                selectedSidebarButton.Selected = true;
+                sectionsContainer.SelectedSection.ValueChanged += section =>
-            };
+                {
+                    selectedSidebarButton.Selected = false;
+                    selectedSidebarButton = sidebar.Children.Single(b => b.Section == section);
+                    selectedSidebarButton.Selected = true;
+                };
+            }
 
             searchTextBox.Current.ValueChanged += newValue => sectionsContainer.SearchContainer.SearchTerm = newValue;
 
             getToolbarHeight = () => game?.ToolbarOffset ?? 0;
+
+            CreateSections()?.ForEach(AddSection);
+        }
+
+        protected void AddSection(SettingsSection section)
+        {
+            sectionsContainer.Add(section);
+
+            if (sidebar != null)
+            {
+                var button = new SidebarButton
+                {
+                    Section = section,
+                    Action = s =>
+                    {
+                        sectionsContainer.ScrollTo(s);
+                        sidebar.State = ExpandedState.Contracted;
+                    },
+                };
+
+                sidebar.Add(button);
+
+                if (selectedSidebarButton == null)
+                {
+                    selectedSidebarButton = sidebar.Children.First();
+                    selectedSidebarButton.Selected = true;
+                }
+            }
         }
 
         protected virtual Drawable CreateHeader() => new Container();
@@ -122,7 +137,7 @@ namespace osu.Game.Overlays
             base.PopIn();
 
             sectionsContainer.MoveToX(0, TRANSITION_LENGTH, Easing.OutQuint);
-            sidebar.MoveToX(0, TRANSITION_LENGTH, Easing.OutQuint);
+            sidebar?.MoveToX(0, TRANSITION_LENGTH, Easing.OutQuint);
             this.FadeTo(1, TRANSITION_LENGTH / 2);
 
             searchTextBox.HoldFocus = true;
@@ -133,7 +148,7 @@ namespace osu.Game.Overlays
             base.PopOut();
 
             sectionsContainer.MoveToX(-width, TRANSITION_LENGTH, Easing.OutQuint);
-            sidebar.MoveToX(-SIDEBAR_WIDTH, TRANSITION_LENGTH, Easing.OutQuint);
+            sidebar?.MoveToX(-SIDEBAR_WIDTH, TRANSITION_LENGTH, Easing.OutQuint);
             this.FadeTo(0, TRANSITION_LENGTH / 2);
 
             searchTextBox.HoldFocus = false;
@@ -155,7 +170,7 @@ namespace osu.Game.Overlays
         {
             base.UpdateAfterChildren();
 
-            sectionsContainer.Margin = new MarginPadding { Left = sidebar.DrawWidth };
+            sectionsContainer.Margin = new MarginPadding { Left = sidebar?.DrawWidth ?? 0 };
             sectionsContainer.Padding = new MarginPadding { Top = getToolbarHeight() };
         }