build method

Implementation

Widget build() {
  // 如果需要双向滚动
  if (_enableScrollX && _enableScrollY) {
    return SingleChildScrollView(
      scrollDirection: Axis.vertical,
      physics: _physics,
      controller: _controller,
      padding: _padding,
      clipBehavior: _clipBehavior,
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        physics: _physics,
        clipBehavior: _clipBehavior,
        child: child,
      ),
    );
  }

  // 如果只需要单向滚动
  if (_enableScrollX || _enableScrollY) {
    return SingleChildScrollView(
      scrollDirection: _scrollDirection ?? (_enableScrollY ? Axis.vertical : Axis.horizontal),
      physics: _physics,
      controller: _controller,
      padding: _padding,
      clipBehavior: _clipBehavior,
      child: child,
    );
  }

  // 如果不需要滚动，只是裁剪
  if (_clipBehavior != Clip.none) {
    return ClipRect(
      clipBehavior: _clipBehavior,
      child: child,
    );
  }

  // 允许溢出显示
  return child;
}