Flutter 获取控件尺寸和位置

final RenderBox box = globalKey.currentContext.findRenderObject();
final size = box.size;
final topLeftPosition = box.localToGlobal(Offset.zero);
return topLeftPosition.dy;

class HeightReporter extends StatelessWidget {
  final Widget child;

  HeightReporter({this.child});

  @override
  Widget build(BuildContext context) {
    return new GestureDetector(
      child: child,
      onTap: () {
        print(‘Height is ${context.size.height}‘);
      },
    );
  }