public class BoxScreen extends HandledScreen<ScreenHandler> {
    private static final Identifier TEXTURE = new Identifier("minecraft", "textures/gui/container/dispenser.png");

    public BoxScreen(ScreenHandler handler, PlayerInventory inventory, Text title) {
        super(handler, inventory, getPositionText(handler).orElse(title));
        //我们尝试获取方块位置以将其用作我们的标题，如果由于某种原因失败，我们将使用默认标题
    }

    //此方法将尝试从 ScreenHandler 获取位置，因为 ScreenRendering 仅发生在客户端上，
    //我们在此处获取具有正确 BlockPos 的 ScreenHandler 实例！
    private static Optional<Text> getPositionText(ScreenHandler handler) {
        if (handler instanceof BoxScreenHandler) {
            BlockPos pos = ((BoxScreenHandler) handler).getPos();
            return pos != null ? Optional.of(new LiteralText("(" + pos.toShortString() + ")")) : Optional.empty();
        } else {
            return Optional.empty();
        }
    }


    @Override
    protected void drawBackground(MatrixStack matrices, float delta, int mouseX, int mouseY) { [...] }

    @Override
    public void render(MatrixStack matrices, int mouseX, int mouseY, float delta) { [...] }

    @Override
    protected void init() { [...] }
}