add a command to allow toggling the visibility of nameplates of other players

src/main/java/me/youhavetrouble/notjustnameplates/NotJustNameplates.java

@@ -32,6 +32,7 @@ public final class NotJustNameplates extends JavaPlugin {
         DefaultPermissions.registerPermission("notjustnameplates.seeown", "Allows a player to see their own nameplate", PermissionDefault.FALSE);
         DefaultPermissions.registerPermission("notjustnameplates.command", "Allows a player to use the /njn command", PermissionDefault.TRUE);
         DefaultPermissions.registerPermission("notjustnameplates.command.reload", "Allows a player to use the /njn reload command", PermissionDefault.OP);
+        DefaultPermissions.registerPermission("notjustnameplates.command.toggle", "Allows a player to use the /njn toggle command", PermissionDefault.TRUE);
 
         this.nameplateManager = new NameplateManager(this);
 

src/main/java/me/youhavetrouble/notjustnameplates/commands/MainCommand.java

@@ -2,9 +2,11 @@ package me.youhavetrouble.notjustnameplates.commands;
 
 
 import me.youhavetrouble.notjustnameplates.NotJustNameplates;
+import me.youhavetrouble.notjustnameplates.nameplates.NameplateManager;
 import net.kyori.adventure.text.Component;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
 import org.jetbrains.annotations.NotNull;
 
@@ -37,6 +39,21 @@ public class MainCommand extends Command {
             return true;
         }
 
+        if (args[0].equalsIgnoreCase("toggle")) {
+            if (!(sender instanceof Player player)) {
+                sender.sendMessage(Component.text("Only players can use this command"));
+                return true;
+            }
+            if (!player.hasPermission("notjustnameplates.command.toggle")) {
+                player.sendMessage(Component.text("You do not have permission to use this command"));
+                return true;
+            }
+            NameplateManager nameplateManager = NotJustNameplates.getInstance().getNameplateManager();
+            nameplateManager.nameplatesToggle(player, !nameplateManager.getPlayersWithNameplatesOff().contains(player.getUniqueId()));
+            sender.sendMessage(Component.text("Toggled nameplates"));
+            return true;
+        }
+
         return false;
     }
 
@@ -47,6 +64,9 @@ public class MainCommand extends Command {
         if (args.length == 1 && sender.hasPermission("notjustnameplates.command.reload")) {
             completions.add("reload");
         }
+        if (args.length == 1 && sender.hasPermission("notjustnameplates.command.toggle")) {
+            completions.add("toggle");
+        }
         return StringUtil.copyPartialMatches(args[args.length - 1], completions, new ArrayList<>());
     }
 }

src/main/java/me/youhavetrouble/notjustnameplates/nameplates/Nameplate.java

@@ -18,7 +18,6 @@ import org.bukkit.potion.PotionEffectType;
 import org.bukkit.util.Transformation;
 import org.jetbrains.annotations.NotNull;
 import org.joml.AxisAngle4f;
-import org.joml.Vector3f;
 import org.kitteh.vanish.VanishPlugin;
 
 import java.util.UUID;
@@ -29,7 +28,7 @@ public class Nameplate {
 
     protected boolean forceHide = false;
     private DisplayContent content;
-    private final UUID playerUuid;
+    public final UUID playerUuid;
     private TextDisplay.TextAlignment alignment = TextDisplay.TextAlignment.CENTER;
     private boolean visibleForOwner = false;
 
@@ -80,6 +79,14 @@ public class Nameplate {
                             content.getCurrentFrame().scale(),
                             new AxisAngle4f(0, 0, 0, 0) // right rotation
                     ));
+
+                    NotJustNameplates.getInstance().getNameplateManager().getPlayersWithNameplatesOff().forEach(uuid -> {
+                        Player playerWithNameplatesOff = Bukkit.getPlayer(uuid);
+                        if (playerWithNameplatesOff != null) {
+                            playerWithNameplatesOff.hideEntity(NotJustNameplates.getInstance(), textDisplay);
+                        }
+                    });
+
                 });
         if (!this.visibleForOwner) {
             player.hideEntity(NotJustNameplates.getInstance(), textDisplay);

src/main/java/me/youhavetrouble/notjustnameplates/nameplates/NameplateManager.java

@@ -14,14 +14,12 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.player.*;
 import org.purpurmc.purpur.event.entity.EntityTeleportHinderedEvent;
 
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.UUID;
+import java.util.*;
 
 public class NameplateManager implements Listener {
 
-    private final HashMap<UUID, Nameplate> nameplates = new HashMap<>();
+    private final Map<UUID, Nameplate> nameplates = new HashMap<>();
+    private final Set<UUID> playersWithNameplatesOff = new HashSet<>();
 
     public NameplateManager(NotJustNameplates plugin) {
         reloadNameplates();
@@ -121,4 +119,33 @@ public class NameplateManager implements Listener {
         return Collections.unmodifiableMap(nameplates);
     }
 
+    public Set<UUID> getPlayersWithNameplatesOff() {
+        return playersWithNameplatesOff;
+    }
+
+    /**
+     * Hide or show nameplates of other players for a player
+     * @param player the player to hide nameplates for
+     * @param hide true to hide, false to show
+     */
+    public void nameplatesToggle(Player player, boolean hide) {
+        if (hide) {
+            playersWithNameplatesOff.add(player.getUniqueId());
+            nameplates.values().forEach(nameplate -> {
+                if (nameplate.playerUuid.equals(player.getUniqueId())) return;
+                TextDisplay display = nameplate.getEntity();
+                if (display == null) return;
+                player.hideEntity(NotJustNameplates.getInstance(), display);
+            });
+            return;
+        }
+        playersWithNameplatesOff.remove(player.getUniqueId());
+        nameplates.values().forEach(nameplate -> {
+            if (nameplate.playerUuid.equals(player.getUniqueId())) return;
+            TextDisplay display = nameplate.getEntity();
+            if (display == null) return;
+            player.showEntity(NotJustNameplates.getInstance(), display);
+        });
+    }
+
 }