minecraft-src/net/minecraft/server/commands/TitleCommand.java

package net.minecraft.server.commands;

import com.mojang.brigadier.CommandDispatcher;
import com.mojang.brigadier.arguments.IntegerArgumentType;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import java.util.Collection;
import java.util.function.Function;
import net.minecraft.commands.CommandBuildContext;
import net.minecraft.commands.CommandSourceStack;
import net.minecraft.commands.Commands;
import net.minecraft.commands.arguments.ComponentArgument;
import net.minecraft.commands.arguments.EntityArgument;
import net.minecraft.commands.arguments.TimeArgument;
import net.minecraft.network.chat.Component;
import net.minecraft.network.chat.ComponentUtils;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.game.ClientboundClearTitlesPacket;
import net.minecraft.network.protocol.game.ClientboundSetActionBarTextPacket;
import net.minecraft.network.protocol.game.ClientboundSetSubtitleTextPacket;
import net.minecraft.network.protocol.game.ClientboundSetTitleTextPacket;
import net.minecraft.network.protocol.game.ClientboundSetTitlesAnimationPacket;
import net.minecraft.server.level.ServerPlayer;

public class TitleCommand {
	public static void register(CommandDispatcher<CommandSourceStack> dispatcher, CommandBuildContext context) {
		dispatcher.register(
			Commands.literal("title")
				.requires(Commands.hasPermission(2))
				.then(
					Commands.argument("targets", EntityArgument.players())
						.then(Commands.literal("clear").executes(commandContext -> clearTitle(commandContext.getSource(), EntityArgument.getPlayers(commandContext, "targets"))))
						.then(Commands.literal("reset").executes(commandContext -> resetTitle(commandContext.getSource(), EntityArgument.getPlayers(commandContext, "targets"))))
						.then(
							Commands.literal("title")
								.then(
									Commands.argument("title", ComponentArgument.textComponent(context))
										.executes(
											commandContext -> showTitle(
												commandContext.getSource(),
												EntityArgument.getPlayers(commandContext, "targets"),
												ComponentArgument.getRawComponent(commandContext, "title"),
												"title",
												ClientboundSetTitleTextPacket::new
											)
										)
								)
						)
						.then(
							Commands.literal("subtitle")
								.then(
									Commands.argument("title", ComponentArgument.textComponent(context))
										.executes(
											commandContext -> showTitle(
												commandContext.getSource(),
												EntityArgument.getPlayers(commandContext, "targets"),
												ComponentArgument.getRawComponent(commandContext, "title"),
												"subtitle",
												ClientboundSetSubtitleTextPacket::new
											)
										)
								)
						)
						.then(
							Commands.literal("actionbar")
								.then(
									Commands.argument("title", ComponentArgument.textComponent(context))
										.executes(
											commandContext -> showTitle(
												commandContext.getSource(),
												EntityArgument.getPlayers(commandContext, "targets"),
												ComponentArgument.getRawComponent(commandContext, "title"),
												"actionbar",
												ClientboundSetActionBarTextPacket::new
											)
										)
								)
						)
						.then(
							Commands.literal("times")
								.then(
									Commands.argument("fadeIn", TimeArgument.time())
										.then(
											Commands.argument("stay", TimeArgument.time())
												.then(
													Commands.argument("fadeOut", TimeArgument.time())
														.executes(
															commandContext -> setTimes(
																commandContext.getSource(),
																EntityArgument.getPlayers(commandContext, "targets"),
																IntegerArgumentType.getInteger(commandContext, "fadeIn"),
																IntegerArgumentType.getInteger(commandContext, "stay"),
																IntegerArgumentType.getInteger(commandContext, "fadeOut")
															)
														)
												)
										)
								)
						)
				)
		);
	}

	private static int clearTitle(CommandSourceStack source, Collection<ServerPlayer> targets) {
		ClientboundClearTitlesPacket clientboundClearTitlesPacket = new ClientboundClearTitlesPacket(false);

		for (ServerPlayer serverPlayer : targets) {
			serverPlayer.connection.send(clientboundClearTitlesPacket);
		}

		if (targets.size() == 1) {
			source.sendSuccess(() -> Component.translatable("commands.title.cleared.single", ((ServerPlayer)targets.iterator().next()).getDisplayName()), true);
		} else {
			source.sendSuccess(() -> Component.translatable("commands.title.cleared.multiple", targets.size()), true);
		}

		return targets.size();
	}

	private static int resetTitle(CommandSourceStack source, Collection<ServerPlayer> targets) {
		ClientboundClearTitlesPacket clientboundClearTitlesPacket = new ClientboundClearTitlesPacket(true);

		for (ServerPlayer serverPlayer : targets) {
			serverPlayer.connection.send(clientboundClearTitlesPacket);
		}

		if (targets.size() == 1) {
			source.sendSuccess(() -> Component.translatable("commands.title.reset.single", ((ServerPlayer)targets.iterator().next()).getDisplayName()), true);
		} else {
			source.sendSuccess(() -> Component.translatable("commands.title.reset.multiple", targets.size()), true);
		}

		return targets.size();
	}

	private static int showTitle(
		CommandSourceStack source, Collection<ServerPlayer> targets, Component title, String titleType, Function<Component, Packet<?>> packetGetter
	) throws CommandSyntaxException {
		for (ServerPlayer serverPlayer : targets) {
			serverPlayer.connection.send((Packet<?>)packetGetter.apply(ComponentUtils.updateForEntity(source, title, serverPlayer, 0)));
		}

		if (targets.size() == 1) {
			source.sendSuccess(
				() -> Component.translatable("commands.title.show." + titleType + ".single", ((ServerPlayer)targets.iterator().next()).getDisplayName()), true
			);
		} else {
			source.sendSuccess(() -> Component.translatable("commands.title.show." + titleType + ".multiple", targets.size()), true);
		}

		return targets.size();
	}

	private static int setTimes(CommandSourceStack source, Collection<ServerPlayer> target, int fade, int stay, int fadeOut) {
		ClientboundSetTitlesAnimationPacket clientboundSetTitlesAnimationPacket = new ClientboundSetTitlesAnimationPacket(fade, stay, fadeOut);

		for (ServerPlayer serverPlayer : target) {
			serverPlayer.connection.send(clientboundSetTitlesAnimationPacket);
		}

		if (target.size() == 1) {
			source.sendSuccess(() -> Component.translatable("commands.title.times.single", ((ServerPlayer)target.iterator().next()).getDisplayName()), true);
		} else {
			source.sendSuccess(() -> Component.translatable("commands.title.times.multiple", target.size()), true);
		}

		return target.size();
	}
}