build method
构建Row组件
Implementation
Widget build() {
List<Widget> childrenWithGap = _buildChildrenWithGap();
return Row(
mainAxisAlignment: _mainAxisAlignment,
crossAxisAlignment: _crossAxisAlignment,
mainAxisSize: _mainAxisSize,
textDirection: _textDirection,
verticalDirection: _verticalDirection,
children: childrenWithGap,
);
}