Show each player's current score in the tab list

src/main/java/eu/mhsl/minecraft/endlessjumper/EndlessJumper.java

@@ -11,6 +11,7 @@ import net.minestom.server.event.player.AsyncPlayerConfigurationEvent;
 import net.minestom.server.event.player.PlayerBlockBreakEvent;
 import net.minestom.server.event.player.PlayerDisconnectEvent;
 import net.minestom.server.event.player.PlayerMoveEvent;
+import net.minestom.server.event.player.PlayerSpawnEvent;
 import net.minestom.server.instance.InstanceContainer;
 import net.minestom.server.instance.InstanceManager;
 import net.minestom.server.instance.block.Block;
@@ -82,7 +83,14 @@ public class EndlessJumper {
 
         eventHandler.addListener(PlayerBlockBreakEvent.class, event -> event.setCancelled(true));
 
-        eventHandler.addListener(PlayerDisconnectEvent.class, event -> games.remove(event.getPlayer()));
+        eventHandler.addListener(PlayerSpawnEvent.class, event -> {
+            if(event.isFirstSpawn()) ScoreTab.join(event.getPlayer());
+        });
+
+        eventHandler.addListener(PlayerDisconnectEvent.class, event -> {
+            games.remove(event.getPlayer());
+            ScoreTab.leave(event.getPlayer());
+        });
 
         server.start("0.0.0.0", 25501);
 

src/main/java/eu/mhsl/minecraft/endlessjumper/ScoreTab.java

@@ -0,0 +1,34 @@
+package eu.mhsl.minecraft.endlessjumper;
+
+import net.minestom.server.entity.Player;
+import net.minestom.server.network.packet.server.play.ScoreboardObjectivePacket;
+import net.minestom.server.scoreboard.TabList;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Zeigt den aktuellen Fortschritt jedes Spielers als Zahl in der Tab-Liste.
+ */
+public class ScoreTab {
+    private static final TabList TAB_LIST = new TabList("jumps", ScoreboardObjectivePacket.Type.INTEGER);
+    private static final Map<Player, Integer> scores = new ConcurrentHashMap<>();
+
+    public static void join(Player player) {
+        TAB_LIST.addViewer(player);
+        scores.put(player, 0);
+        // dem neuen Spieler auch die Scores aller anderen zeigen
+        scores.forEach(TAB_LIST::updateScore);
+    }
+
+    public static void update(Player player, int score) {
+        if(!scores.containsKey(player)) return;
+        scores.put(player, score);
+        TAB_LIST.updateScore(player, score);
+    }
+
+    public static void leave(Player player) {
+        scores.remove(player);
+        TAB_LIST.removeViewer(player);
+    }
+}

src/main/java/eu/mhsl/minecraft/endlessjumper/generator/JumpGenerator.java

@@ -4,6 +4,7 @@ import net.kyori.adventure.sound.Sound;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.format.TextColor;
 import net.kyori.adventure.title.Title;
+import eu.mhsl.minecraft.endlessjumper.ScoreTab;
 import net.minestom.server.coordinate.Pos;
 import net.minestom.server.entity.Player;
 import net.minestom.server.instance.InstanceContainer;
@@ -50,7 +51,9 @@ public class JumpGenerator {
         float pitch = 1 + (combo * 0.025f);
         this.player.playSound(Sound.sound(SoundEvent.BLOCK_NOTE_BLOCK_PLING, Sound.Source.MASTER, 0.1f, pitch));
         this.player.showTitle(Title.title(Component.text(""), Component.text((combo)+"", TextColor.color(255, 69, 0))));
-        this.player.setLevel((this.blocks.size()-this.preview-1));
+        int score = Math.max(0, this.blocks.size()-this.preview-1);
+        this.player.setLevel(score);
+        ScoreTab.update(this.player, score);
 
         Random r = new Random();
         int index = this.blocks.size();