Add method to hide hud elements (#2183)

src/main/java/cn/nukkit/Player.java

@@ -5523,4 +5523,16 @@ public void onCompletion(Server server) {
         this.server.getScheduler().scheduleAsyncTask(this.preLoginEventTask);
         this.processLogin();
     }
+
+    /**
+     * Show or hide hud elements for the player
+     * @param visible whether the listed elements will be visible
+     * @param elements elements
+     */
+    public void setHudElementVisibility(boolean visible, HudElement... elements) {
+        SetHudPacket pk = new SetHudPacket();
+        pk.elements.addAll(Arrays.asList(elements));
+        pk.visible = visible;
+        this.dataPacket(pk);
+    }
 }

src/main/java/cn/nukkit/network/protocol/ProtocolInfo.java

@@ -220,5 +220,14 @@ public interface ProtocolInfo {
     // MC packet IDs continue from 300 (0x12c)
     // Hack: 100 is added to the IDs below on encode
     // TODO: New pid() function (int) while trying not to break too many plugins
-    byte __INTERNAL__OPEN_SIGN_PACKET = (byte) 203; // 303
+    byte __INTERNAL__CAMERA_INSTRUCTION_PACKET = (byte) 200;
+    byte __INTERNAL__COMPRESSED_BIOME_DEFINITIONS_LIST_PACKET = (byte) 201;
+    byte __INTERNAL__TRIM_DATA_PACKET = (byte) 202;
+    byte __INTERNAL__OPEN_SIGN_PACKET = (byte) 203;
+    byte __INTERNAL__AGENT_ANIMATION_PACKET = (byte) 204;
+    byte __INTERNAL__REFRESH_ENTITLEMENTS_PACKET = (byte) 205;
+    byte __INTERNAL__TOGGLE_CRAFTER_SLOT_REQUEST_PACKET = (byte) 206;
+    byte __INTERNAL__SET_PLAYER_INVENTORY_OPTIONS_PACKET = (byte) 207;
+    byte __INTERNAL__SET_HUD_PACKET = (byte) 208;
+    byte __INTERNAL__AWARD_ACHIEVEMENT_PACKET = (byte) 209;
 }

src/main/java/cn/nukkit/network/protocol/SetHudPacket.java

@@ -0,0 +1,35 @@
+package cn.nukkit.network.protocol;
+
+import cn.nukkit.network.protocol.types.HudElement;
+import it.unimi.dsi.fastutil.objects.ObjectArrayList;
+import lombok.ToString;
+
+import java.util.List;
+
+@ToString
+public class SetHudPacket extends DataPacket {
+
+    public static final byte NETWORK_ID = ProtocolInfo.__INTERNAL__SET_HUD_PACKET;
+
+    public final List<HudElement> elements = new ObjectArrayList<>();
+    public boolean visible;
+
+    @Override
+    public byte pid() {
+        return NETWORK_ID;
+    }
+
+    @Override
+    public void decode() {
+    }
+
+    @Override
+    public void encode() {
+        this.reset();
+        this.putUnsignedVarInt(this.elements.size());
+        for (HudElement element : this.elements) {
+            this.putUnsignedVarInt(element.ordinal());
+        }
+        this.putBoolean(this.visible);
+    }
+}

src/main/java/cn/nukkit/network/protocol/types/HudElement.java

@@ -0,0 +1,24 @@
+package cn.nukkit.network.protocol.types;
+
+public enum HudElement {
+
+    PAPER_DOLL,
+    ARMOR,
+    TOOL_TIPS,
+    TOUCH_CONTROLS,
+    CROSSHAIR,
+    HOTBAR,
+    HEALTH,
+    PROGRESS_BAR,
+    FOOD_BAR,
+    AIR_BUBBLES_BAR,
+    VEHICLE_HEALTH,
+    /**
+     * @since v671
+     */
+    EFFECTS_BAR,
+    /**
+     * @since v671
+     */
+    ITEM_TEXT_POPUP
+}

src/main/java/cn/nukkit/scoreboard/Scoreboard.java

@@ -5,7 +5,6 @@
 import cn.nukkit.network.protocol.RemoveObjectivePacket;
 import cn.nukkit.network.protocol.SetDisplayObjectivePacket;
 import cn.nukkit.network.protocol.SetScorePacket;
-import com.google.common.collect.ImmutableMap;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;