Added track previews to the downloads menu.

Currently uses the osu! server to load MP3 previews.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/states/DownloadsMenu.java

@@ -39,6 +39,11 @@ import itdelatrisu.opsu.downloads.DownloadServer;
 
 import java.io.File;
 import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import javax.sound.sampled.LineEvent;
+import javax.sound.sampled.LineListener;
 
 import org.newdawn.slick.Color;
 import org.newdawn.slick.GameContainer;
@@ -51,6 +56,7 @@ import org.newdawn.slick.state.BasicGameState;
 import org.newdawn.slick.state.StateBasedGame;
 import org.newdawn.slick.state.transition.FadeInTransition;
 import org.newdawn.slick.state.transition.FadeOutTransition;
+import org.newdawn.slick.util.Log;
 
 /**
  * Downloads menu.
@@ -137,6 +143,9 @@ public class DownloadsMenu extends BasicGameState {
 	/** Beatmap importing thread. */
 	private Thread importThread;
 
+	/** Beatmap set ID of the current beatmap being previewed, or -1 if none. */
+	private int previewID = -1;
+
 	// game-related variables
 	private GameContainer container;
 	private StateBasedGame game;
@@ -248,7 +257,8 @@ public class DownloadsMenu extends BasicGameState {
 				int index = startResult + i;
 				if (index >= nodes.length)
 					break;
-				nodes[index].drawResult(g, i, DownloadNode.resultContains(mouseX, mouseY, i), (index == focusResult));
+				nodes[index].drawResult(g, i, DownloadNode.resultContains(mouseX, mouseY, i),
+						(index == focusResult), (previewID == nodes[index].getID()));
 			}
 
 			// scroll bar
@@ -441,10 +451,61 @@ public class DownloadsMenu extends BasicGameState {
 					if (index >= nodes.length)
 						break;
 					if (DownloadNode.resultContains(x, y, i)) {
-						DownloadNode node = nodes[index];
+						final DownloadNode node = nodes[index];
 
 						// check if map is already loaded
-						if (OsuGroupList.get().containsBeatmapSetID(node.getID()))
+						boolean isLoaded = OsuGroupList.get().containsBeatmapSetID(node.getID());
+
+						// track preview
+						if (DownloadNode.resultIconContains(x, y, i)) {
+							// set focus
+							if (!isLoaded) {
+								SoundController.playSound(SoundEffect.MENUCLICK);
+								focusResult = index;
+								focusTimer = FOCUS_DELAY;
+							}
+
+							if (previewID == node.getID()) {
+								// stop preview
+								previewID = -1;
+								SoundController.stopTrack();
+							} else {
+								// play preview
+								try {
+									final URL url = new URL(server.getPreviewURL(node.getID()));
+									MusicController.pause();
+									new Thread() {
+										@Override
+										public void run() {
+											try {
+												previewID = -1;
+												SoundController.playTrack(url, true, new LineListener() {
+													@Override
+													public void update(LineEvent event) {
+														if (event.getType() == LineEvent.Type.STOP) {
+															if (previewID != -1) {
+																SoundController.stopTrack();
+																previewID = -1;
+															}
+														}
+													}
+												});
+												previewID = node.getID();
+											} catch (SlickException e) {
+												UI.sendBarNotification("Failed to load track preview.");
+												Log.error(e);
+											}
+										}
+									}.start();
+								} catch (MalformedURLException e) {
+									UI.sendBarNotification("Could not load track preview (bad URL).");
+									Log.error(e);
+								}
+							}
+							return;
+						}
+
+						if (isLoaded)
 							return;
 
 						SoundController.playSound(SoundEffect.MENUCLICK);
@@ -677,12 +738,15 @@ public class DownloadsMenu extends BasicGameState {
 		startResult = 0;
 		startDownloadIndex = 0;
 		pageDir = Page.RESET;
+		previewID = -1;
 	}
 
 	@Override
 	public void leave(GameContainer container, StateBasedGame game)
 			throws SlickException {
 		search.setFocus(false);
+		SoundController.stopTrack();
+		MusicController.resume();
 	}
 
 	/**

src/itdelatrisu/opsu/states/Game.java

@@ -1099,9 +1099,8 @@ public class Game extends BasicGameState {
 			UI.hideCursor();
 
 		// replays
-		if (isReplay) {
+		if (isReplay)
 			GameMod.loadModState(previousMods);
-		}
 	}
 
 	/**