feat: add PromptSign

build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
 }
 
 group = "net.azisaba"
-version = "6.11.2"
+version = "6.12.0"
 
 java {
     toolchain.languageVersion.set(JavaLanguageVersion.of(8))

src/main/java/com/github/mori01231/lifecore/event/AsyncPreSignChangeEvent.kt

@@ -0,0 +1,36 @@
+package com.github.mori01231.lifecore.event
+
+import net.minecraft.server.v1_15_R1.BlockPosition
+import org.bukkit.Location
+import org.bukkit.entity.Player
+import org.bukkit.event.Cancellable
+import org.bukkit.event.Event
+import org.bukkit.event.HandlerList
+
+/**
+ * Called when a player tries to update a sign.
+ * @param player The player who tried to update the sign.
+ * @param pos The position of the sign.
+ * @param lines The lines of the sign.
+ */
+data class AsyncPreSignChangeEvent(
+    val player: Player,
+    val pos: Location,
+    val lines: List<String>,
+) : Event(true), Cancellable {
+    private var cancelled = false
+
+    override fun getHandlers() = handlerList
+
+    companion object {
+        @JvmStatic
+        @get:JvmName("getHandlerList")
+        val handlerList = HandlerList()
+    }
+
+    override fun isCancelled(): Boolean = cancelled
+
+    override fun setCancelled(cancel: Boolean) {
+        this.cancelled = cancel
+    }
+}

src/main/java/com/github/mori01231/lifecore/network/PacketHandler.java

@@ -2,15 +2,22 @@
 
 import com.github.mori01231.lifecore.event.AsyncPlayerPreInteractEntityEvent;
 import com.github.mori01231.lifecore.event.AsyncPlayerPreInteractEvent;
+import com.github.mori01231.lifecore.event.AsyncPreSignChangeEvent;
 import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelHandlerContext;
 import net.minecraft.server.v1_15_R1.Entity;
 import net.minecraft.server.v1_15_R1.EntityPlayer;
+import net.minecraft.server.v1_15_R1.PacketPlayInUpdateSign;
 import net.minecraft.server.v1_15_R1.PacketPlayInUseEntity;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
 import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.Arrays;
+import java.util.List;
+
 public class PacketHandler extends ChannelDuplexHandler {
     private final Player player;
     private final EntityPlayer entityPlayer;
@@ -33,6 +40,15 @@ public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
                 return;
             }
         }
+        if (msg instanceof PacketPlayInUpdateSign) {
+            PacketPlayInUpdateSign packet = (PacketPlayInUpdateSign) msg;
+            Location location = new Location(player.getWorld(), packet.b().getX(), packet.b().getY(), packet.b().getZ());
+            List<String> lines = Arrays.asList(packet.c());
+            if (new AsyncPreSignChangeEvent(player, location, lines).callEvent()) {
+                super.channelRead(ctx, msg);
+            }
+            return;
+        }
         super.channelRead(ctx, msg);
     }
 

src/main/java/com/github/mori01231/lifecore/util/PromptSign.kt

@@ -0,0 +1,28 @@
+package com.github.mori01231.lifecore.util
+
+import net.minecraft.server.v1_15_R1.BlockPosition
+import net.minecraft.server.v1_15_R1.PacketPlayOutOpenSignEditor
+import org.bukkit.Material
+import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer
+import org.bukkit.entity.Player
+import java.util.*
+import java.util.concurrent.ConcurrentHashMap
+
+object PromptSign {
+
+    private val awaitingSign = ConcurrentHashMap<UUID, (List<String>) -> Unit>()
+
+    @JvmStatic
+    fun promptSign(player: Player, action: (List<String>) -> Unit) {
+        val loc0 = player.location.clone().apply { y = 0.0 }
+        val origBlockData = loc0.block.blockData
+        player.sendBlockChange(loc0, Material.AIR.createBlockData())
+        player.sendBlockChange(loc0, Material.OAK_SIGN.createBlockData())
+        awaitingSign[player.uniqueId] = {
+            player.sendBlockChange(loc0, origBlockData)
+            action(it)
+        }
+        (player as CraftPlayer).handle.playerConnection
+            .sendPacket(PacketPlayOutOpenSignEditor(BlockPosition(loc0.blockX, loc0.blockY, loc0.blockZ)))
+    }
+}