add previews to osu!direct

osu.Game/Overlays/Direct/PlayButton.cs

@@ -0,0 +1,105 @@
+// 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.Graphics;
+using osu.Framework.Allocation;
+using osu.Framework.Audio;
+using osu.Framework.Audio.Track;
+using osu.Framework.Configuration;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Input;
+using osu.Game.Beatmaps;
+using osu.Game.Graphics;
+using System.Threading.Tasks;
+
+namespace osu.Game.Overlays.Direct
+{
+    public class PlayButton : Container
+    {
+        public string TrackURL;
+
+        public Bindable<bool> Playing;
+
+        public Track Track;
+        private Bindable<WorkingBeatmap> gameBeatmap;
+        private AudioManager audio;
+
+        private Color4 hoverColour;
+        private readonly SpriteIcon icon;
+
+        public PlayButton(Bindable<bool> playing)
+        {
+            Playing = playing;
+            Add(icon = new SpriteIcon()
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                FillMode = FillMode.Fit,
+                RelativeSizeAxes = Axes.Both,
+                Icon = FontAwesome.fa_play,
+            });
+
+            Playing.ValueChanged += newValue => icon.Icon = newValue ? (Track == null ? FontAwesome.fa_spinner : FontAwesome.fa_pause) : FontAwesome.fa_play;
+
+            Playing.ValueChanged += newValue =>
+            {
+                if (newValue)
+                    Track?.Start();
+                else
+                    Track?.Stop();
+            };
+
+            Playing.ValueChanged += newValue => icon.FadeColour(newValue || IsHovered ? hoverColour : Color4.White, 120, Easing.InOutQuint);
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colour, OsuGameBase game, AudioManager audio)
+        {
+            hoverColour = colour.Yellow;
+            gameBeatmap = game.Beatmap;
+            this.audio = audio;
+        }
+
+        private Task loadTask;
+
+        protected override bool OnClick(InputState state)
+        {
+            gameBeatmap.Value.Track.Stop();
+
+            Playing.Value = !Playing.Value;
+
+            if (loadTask == null)
+            {
+                icon.Spin(2000, RotationDirection.Clockwise);
+
+                loadTask = Task.Run(() =>
+                {
+                    Track = audio.Track.Get(TrackURL);
+                    Track.Looping = true;
+                    if (Playing)
+                        Track.Start();
+
+                    icon.ClearTransforms();
+                    icon.Rotation = 0;
+                    Playing.TriggerChange();
+                });
+            }
+
+            return true;
+        }
+
+        protected override bool OnHover(InputState state)
+        {
+            icon.FadeColour(hoverColour, 120, Easing.InOutQuint);
+            return base.OnHover(state);
+        }
+
+        protected override void OnHoverLost(InputState state)
+        {
+            if(!Playing)
+                icon.FadeColour(Color4.White, 120, Easing.InOutQuint);
+            base.OnHoverLost(state);
+        }
+    }
+}