Player Entity Tracking Events

paper-api/src/main/java/io/papermc/paper/event/player/PlayerTrackEntityEvent.java

@@ -0,0 +1,60 @@
+package io.papermc.paper.event.player;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Is called when a {@link Player} tracks an {@link Entity}.
+ * <p>
+ * If cancelled entity is not shown to the player and interaction in both directions is not possible.
+ * <p>
+ * Adding or removing entities from the world at the point in time this event is called is completely
+ * unsupported and should be avoided.
+ */
+@NullMarked
+public class PlayerTrackEntityEvent extends PlayerEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Entity entity;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public PlayerTrackEntityEvent(final Player player, final Entity entity) {
+        super(player);
+        this.entity = entity;
+    }
+
+    /**
+     * Gets the entity that will be tracked
+     *
+     * @return the entity tracked
+     */
+    public Entity getEntity() {
+        return this.entity;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+}

paper-api/src/main/java/io/papermc/paper/event/player/PlayerUntrackEntityEvent.java

@@ -0,0 +1,46 @@
+package io.papermc.paper.event.player;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Is called when a {@link Player} untracks an {@link Entity}.
+ * <p>
+ * Adding or removing entities from the world at the point in time this event is called is completely
+ * unsupported and should be avoided.
+ */
+@NullMarked
+public class PlayerUntrackEntityEvent extends PlayerEvent {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Entity entity;
+
+    @ApiStatus.Internal
+    public PlayerUntrackEntityEvent(final Player player, final Entity entity) {
+        super(player);
+        this.entity = entity;
+    }
+
+    /**
+     * Gets the entity that will be untracked
+     *
+     * @return the entity untracked
+     */
+    public Entity getEntity() {
+        return this.entity;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+}