add search box and the ability to search

osu.Game/Overlays/Options/OptionsSection.cs

@@ -1,4 +1,6 @@
-// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+using System;
+using System.Collections.Generic;
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using OpenTK;
@@ -10,10 +12,11 @@ using osu.Framework.Graphics.Primitives;
 using osu.Framework.Graphics.Sprites;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
+using System.Linq;
 
 namespace osu.Game.Overlays.Options
 {
-    public abstract class OptionsSection : Container
+    public abstract class OptionsSection : Container, IHasFilterableChildren
     {
         protected FillFlowContainer FlowContent;
         protected override Container<Drawable> Content => FlowContent;
@@ -21,6 +24,16 @@ namespace osu.Game.Overlays.Options
         public abstract FontAwesome Icon { get; }
         public abstract string Header { get; }
 
+        public IEnumerable<IFilterable> FilterableChildren => Children.OfType<IFilterable>();
+        public string[] FilterTerms => new[] { Header };
+        public bool MatchingCurrentFilter
+        {
+            set
+            {
+                FadeTo(value ? 1 : 0);
+            }
+        }
+
         private readonly SpriteText headerLabel;
 
         protected OptionsSection()

osu.Game/Overlays/Options/OptionsSubsection.cs

@@ -6,10 +6,12 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
 using osu.Game.Graphics.Sprites;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace osu.Game.Overlays.Options
 {
-    public abstract class OptionsSubsection : FillFlowContainer
+    public abstract class OptionsSubsection : FillFlowContainer, IHasFilterableChildren
     {
         protected override Container<Drawable> Content => content;
 
@@ -17,6 +19,16 @@ namespace osu.Game.Overlays.Options
 
         protected abstract string Header { get; }
 
+        public IEnumerable<IFilterable> FilterableChildren => Children.OfType<IFilterable>();
+        public string[] FilterTerms => new[] { Header };
+        public bool MatchingCurrentFilter
+        {
+            set
+            {
+                FadeTo(value ? 1 : 0);
+            }
+        }
+
         protected OptionsSubsection()
         {
             RelativeSizeAxes = Axes.X;

osu.Game/Overlays/OptionsOverlay.cs

@@ -13,6 +13,7 @@ using System;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Sprites;
 using osu.Game.Overlays.Options.Sections;
+using osu.Game.Graphics.UserInterface;
 
 namespace osu.Game.Overlays
 {
@@ -32,6 +33,7 @@ namespace osu.Game.Overlays
         private Sidebar sidebar;
         private SidebarButton[] sidebarButtons;
         private OptionsSection[] sections;
+        private SearchContainer searchContainer;
         private float lastKnownScroll;
 
         public OptionsOverlay()
@@ -43,6 +45,8 @@ namespace osu.Game.Overlays
         [BackgroundDependencyLoader(permitNulls: true)]
         private void load(OsuGame game, OsuColour colours)
         {
+            OsuTextBox textBox;
+
             sections = new OptionsSection[]
             {
                 new GeneralSection(),
@@ -92,7 +96,13 @@ namespace osu.Game.Overlays
                                     TextSize = 18,
                                     Margin = new MarginPadding { Left = CONTENT_MARGINS, Bottom = 30 },
                                 },
-                                new FillFlowContainer
+                                textBox = new OsuTextBox
+                                {
+                                    PlaceholderText = "Type to search!",
+                                    Width = width - CONTENT_MARGINS * 2,
+                                    Margin = new MarginPadding { Left = CONTENT_MARGINS },
+                                },
+                                searchContainer = new SearchContainer
                                 {
                                     AutoSizeAxes = Axes.Y,
                                     RelativeSizeAxes = Axes.X,
@@ -118,6 +128,8 @@ namespace osu.Game.Overlays
                 }
             };
 
+            textBox.Current.ValueChanged += newValue => searchContainer.SearchTerm = newValue;
+
             scrollContainer.Padding = new MarginPadding { Top = game?.Toolbar.DrawHeight ?? 0 };
         }