OsuNub -> Nub.

osu.Game/Graphics/UserInterface/Nub.cs

@@ -0,0 +1,113 @@
+// Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu-framework/master/LICENCE
+
+using OpenTK;
+using OpenTK.Graphics;
+using osu.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.UserInterface;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    class Nub : Container, IStateful<CheckBoxState>
+    {
+        public const float COLLAPSED_SIZE = 20;
+        public const float EXPANDED_SIZE = 40;
+
+        private Box fill;
+
+        const float border_width = 3;
+        private Color4 glowingColour, idleColour;
+
+        public Nub()
+        {
+            Size = new Vector2(COLLAPSED_SIZE, 12);
+
+            Masking = true;
+
+            CornerRadius = Height / 2;
+            Masking = true;
+            BorderColour = Color4.White;
+            BorderThickness = border_width;
+
+            Children = new[]
+            {
+                fill = new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Alpha = 0.01f, //todo: remove once we figure why containers aren't drawing at all times
+                },
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            Colour = idleColour = colours.Pink;
+            glowingColour = colours.PinkLighter;
+
+            EdgeEffect = new EdgeEffect
+            {
+                Colour = colours.PinkDarker,
+                Type = EdgeEffectType.Glow,
+                Radius = 10,
+                Roundness = 8,
+            };
+
+            FadeGlowTo(0);
+        }
+
+        public bool Glowing
+        {
+            set
+            {
+                if (value)
+                {
+                    FadeColour(glowingColour, 500, EasingTypes.OutQuint);
+                    FadeGlowTo(1, 500, EasingTypes.OutQuint);
+                }
+                else
+                {
+                    FadeGlowTo(0, 500);
+                    FadeColour(idleColour, 500);
+                }
+            }
+        }
+
+        public bool Expanded
+        {
+            set
+            {
+                ResizeTo(new Vector2(value ? EXPANDED_SIZE : COLLAPSED_SIZE, 12), 500, EasingTypes.OutQuint);
+            }
+        }
+
+        private CheckBoxState state;
+
+        public CheckBoxState State
+        {
+            get
+            {
+                return state;
+            }
+            set
+            {
+                state = value;
+
+                switch (state)
+                {
+                    case CheckBoxState.Checked:
+                        fill.FadeIn(200, EasingTypes.OutQuint);
+                        break;
+                    case CheckBoxState.Unchecked:
+                        fill.FadeTo(0.01f, 200, EasingTypes.OutQuint); //todo: remove once we figure why containers aren't drawing at all times
+                        break;
+                }
+            }
+        }
+    }
+}