自定義畫面顯示

public class OpenCustomGuiPacket {
    public static final Identifier ID = new Identifier(TheClassicofMountainsandOceans.MOD_ID,"opengui");

    public static void sendToClient(ServerPlayerEntity player) {
        PacketByteBuf buf = new PacketByteBuf(Unpooled.buffer());
        
        ServerPlayNetworking.send(player, ID, buf);
    }

    public static void registerReceiver() {
        ClientPlayNetworking.registerGlobalReceiver(ID, (client, handler, buf, responseSender) -> {
            client.execute(() -> {
                
                MinecraftClient.getInstance().setScreen(new CustomScreen(
                        new CustomScreenHandler(0, MinecraftClient.getInstance().player.getInventory()),
                        MinecraftClient.getInstance().player.getInventory(),
                        MinecraftClient.getInstance().player.getName()
                ));
            });
        });
    }
}

自定義畫面顯示到這邊就差不多完成了，我們可以打開遊戲畫面來看一下成果

Mixin

接下來我們需要再與村民互動的原始碼中插入我們自己的程式碼，並且攔截原本與村民互動的程式。

@Mixin(VillagerEntity.class)
public class TradeRenderMixin {
    @Inject(method = "interactMob",
            at = @At(value = "INVOKE",
                    target = "Lnet/minecraft/entity/passive/VillagerEntity;beginTradeWith(Lnet/minecraft/entity/player/PlayerEntity;)V",shift = At.Shift.BEFORE),
            cancellable = true)
    private void beforeBeginTradeWith(PlayerEntity player, Hand hand, CallbackInfoReturnable<ActionResult> cir) {
        if (!player.getWorld().isClient()) { // 确保这是在服务器端
            if (player instanceof ServerPlayerEntity serverPlayer) {
                OpenCustomGuiPacket.sendToClient(serverPlayer);
                cir.setReturnValue(ActionResult.SUCCESS); // 阻止默认交易行为
                cir.cancel();
            }
        }
    }
}

首先我們Mixin的目標是VillagerEntity，這是村民的程式所在，我們在這個村民類別中的interactMob方法中插入我們得程式，並且這個程式的目標位子我們透過閱讀程式的ByteCode來鎖定，剩下的內容明天說