Play control.

osu.Game/Overlays/MusicController.cs

@@ -7,11 +7,14 @@ using System.Linq;
 using OpenTK;
 using OpenTK.Graphics;
 using osu.Framework;
+using osu.Framework.Audio.Track;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
+using osu.Framework.Graphics.Transformations;
 using osu.Framework.Input;
+using osu.Game.Beatmaps.IO;
 using osu.Game.Database;
 using osu.Game.Graphics;
 
@@ -21,18 +24,23 @@ namespace osu.Game.Overlays
     {
         private Sprite backgroundSprite;
         private Box progress;
+        private ClickableTextAwesome playButton, listButton;
         private SpriteText title, artist;
+        private OsuGameBase osuGame;
         private List<BeatmapSetInfo> playList;
         private BeatmapSetInfo currentPlay;
+        private AudioTrack currentTrack;
         public override void Load(BaseGame game)
         {
             base.Load(game);
-            playList = (game as OsuGameBase).Beatmaps.Query<BeatmapSetInfo>().ToList();
+            osuGame = game as OsuGameBase;
+            playList = osuGame.Beatmaps.Query<BeatmapSetInfo>().ToList();
             currentPlay = playList.FirstOrDefault();
             Width = 400;
             Height = 130;
             CornerRadius = 5;
             Masking = true;
+
             Children = new Drawable[]
             {
                 backgroundSprite = getScaledSprite(game.Textures.Get(@"Backgrounds/bg4")),//placeholder
@@ -48,7 +56,7 @@ namespace osu.Game.Overlays
                     Position = new Vector2(0, 40),
                     TextSize = 20,
                     Colour = Color4.White,
-                    Text = currentPlay?.Metadata.TitleUnicode ?? currentPlay?.Metadata.Title ?? @"Nothing to play"
+                    Text = @"Nothing to play"
                 },
                 artist = new SpriteText
                 {
@@ -57,7 +65,7 @@ namespace osu.Game.Overlays
                     Position = new Vector2(0, 45),
                     TextSize = 12,
                     Colour = Color4.White,
-                    Text = currentPlay?.Metadata.ArtistUnicode ?? currentPlay?.Metadata.Artist ?? @"Nothing to play"
+                    Text = @"Nothing to play"
                 },
                 new Box
                 {
@@ -67,13 +75,27 @@ namespace osu.Game.Overlays
                     Anchor = Anchor.BottomCentre,
                     Colour = new Color4(0, 0, 0, 127)
                 },
-                new ClickableTextAwesome
+                playButton = new ClickableTextAwesome
                 {
                     TextSize = 30,
                     Icon = FontAwesome.play_circle_o,
                     Origin = Anchor.Centre,
                     Anchor = Anchor.BottomCentre,
-                    Position = new Vector2(0, 30)
+                    Position = new Vector2(0, 30),
+                    Action = () =>
+                    {
+                        if (currentTrack == null) return;
+                        if (currentTrack.IsRunning)
+                        {
+                            currentTrack.Stop();
+                            playButton.Icon = FontAwesome.play_circle_o;
+                        }
+                        else
+                        {
+                            currentTrack.Start();
+                            playButton.Icon = FontAwesome.pause;
+                        }
+                    }
                 },
                 new ClickableTextAwesome
                 {
@@ -81,7 +103,8 @@ namespace osu.Game.Overlays
                     Icon = FontAwesome.step_backward,
                     Origin = Anchor.Centre,
                     Anchor = Anchor.BottomCentre,
-                    Position = new Vector2(-30, 30)
+                    Position = new Vector2(-30, 30),
+                    Action = prev
                 },
                 new ClickableTextAwesome
                 {
@@ -89,9 +112,10 @@ namespace osu.Game.Overlays
                     Icon = FontAwesome.step_forward,
                     Origin = Anchor.Centre,
                     Anchor = Anchor.BottomCentre,
-                    Position = new Vector2(30, 30)
+                    Position = new Vector2(30, 30),
+                    Action = next
                 },
-                new ClickableTextAwesome
+                listButton = new ClickableTextAwesome
                 {
                     TextSize = 15,
                     Icon = FontAwesome.bars,
@@ -109,6 +133,55 @@ namespace osu.Game.Overlays
                     Colour = Color4.Orange
                 }
             };
+            if (currentPlay != null) play(currentPlay, null);
+        }
+
+        private void prev()
+        {
+            int i = playList.IndexOf(currentPlay);
+            if (i == -1) return;
+            i = (i - 1 + playList.Count) % playList.Count;
+            currentPlay = playList[i];
+            play(currentPlay, false);
+        }
+
+        private void next()
+        {
+            int i = playList.IndexOf(currentPlay);
+            if (i == -1) return;
+            i = (i + 1) % playList.Count;
+            currentPlay = playList[i];
+            play(currentPlay, true);
+        }
+
+        private void play(BeatmapSetInfo beatmap, bool? isNext)
+        {
+            title.Text = beatmap.Metadata.TitleUnicode ?? beatmap.Metadata.Title;
+            artist.Text = beatmap.Metadata.ArtistUnicode ?? beatmap.Metadata.Artist;
+            ArchiveReader reader = osuGame.Beatmaps.GetReader(currentPlay);
+            currentTrack?.Stop();
+            currentTrack = new AudioTrackBass(reader.ReadFile(beatmap.Metadata.AudioFile));
+            currentTrack.Start();
+            Sprite newBackground = getScaledSprite(TextureLoader.FromStream(reader.ReadFile(beatmap.Metadata.BackgroundFile)));
+            Add(newBackground);
+            if (isNext == true)
+            {
+                newBackground.Position = new Vector2(400, 0);
+                newBackground.MoveToX(0, 200, EasingTypes.Out);
+                backgroundSprite.MoveToX(-400, 200, EasingTypes.Out);
+                backgroundSprite.Expire();
+            }
+            else if (isNext == false)
+            {
+                newBackground.Position = new Vector2(-400, 0);
+                newBackground.MoveToX(0, 200, EasingTypes.Out);
+                backgroundSprite.MoveToX(400, 200, EasingTypes.Out);
+                backgroundSprite.Expire();
+            }
+            else
+            {
+                Remove(backgroundSprite);
+            }
         }
 
         private Sprite getScaledSprite(Texture background)
@@ -132,11 +205,11 @@ namespace osu.Game.Overlays
 
     public class ClickableTextAwesome : TextAwesome
     {
-        public Action<ClickableTextAwesome> Action;
+        public Action Action;
 
         protected override bool OnClick(InputState state)
         {
-            Action?.Invoke(this);
+            Action?.Invoke();
             return true;
         }
     }