Applied suggested changes

osu.Game/Graphics/UserInterface/IconButton.cs

@@ -0,0 +1,114 @@
+// 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;
+using OpenTK.Graphics;
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Input;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    public class IconButton : ClickableContainer
+    {
+        private readonly TextAwesome icon;
+        private readonly Box hover;
+        private readonly Container content;
+
+        public FontAwesome Icon
+        {
+            get { return icon.Icon; }
+            set { icon.Icon = value; }
+        }
+
+        private const float button_size = 30;
+        private Color4 flashColour;
+
+        public Vector2 IconScale
+        {
+            get { return icon.Scale; }
+            set { icon.Scale = value; }
+        }
+
+        public IconButton()
+        {
+            AutoSizeAxes = Axes.Both;
+
+            Origin = Anchor.Centre;
+            Anchor = Anchor.Centre;
+
+            Children = new Drawable[]
+            {
+                content = new Container
+                {
+                    Origin = Anchor.Centre,
+                    Anchor = Anchor.Centre,
+                    Size = new Vector2 (button_size),
+
+                    CornerRadius = 5,
+                    Masking = true,
+                    EdgeEffect = new EdgeEffect
+                    {
+                        Colour = Color4.Black.Opacity(0.04f),
+                        Type = EdgeEffectType.Shadow,
+                        Radius = 5,
+                    },
+                    Children = new Drawable[]
+                    {
+                        hover = new Box
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Alpha = 0,
+                        },
+                        icon = new TextAwesome
+                        {
+                            Origin = Anchor.Centre,
+                            Anchor = Anchor.Centre,
+                            TextSize = 18,
+                        }
+                    }
+                }
+            };
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            hover.Colour = colours.Yellow.Opacity(0.6f);
+            flashColour = colours.Yellow;
+        }
+
+        protected override bool OnHover(InputState state)
+        {
+            hover.FadeIn(500, EasingTypes.OutQuint);
+            return base.OnHover(state);
+        }
+
+        protected override void OnHoverLost(InputState state)
+        {
+            hover.FadeOut(500, EasingTypes.OutQuint);
+            base.OnHoverLost(state);
+        }
+
+        protected override bool OnClick(InputState state)
+        {
+            hover.FlashColour(flashColour, 800, EasingTypes.OutQuint);
+            return base.OnClick(state);
+        }
+
+        protected override bool OnMouseDown(InputState state, MouseDownEventArgs args)
+        {
+            content.ScaleTo(0.75f, 2000, EasingTypes.OutQuint);
+            return base.OnMouseDown(state, args);
+        }
+
+        protected override bool OnMouseUp(InputState state, MouseUpEventArgs args)
+        {
+            content.ScaleTo(1, 1000, EasingTypes.OutElastic);
+            return base.OnMouseUp(state, args);
+        }
+    }
+}