如何在Flutter中用两个手指旋转手势？

Question

I'm using Flutter for my mobile app. My designer told me to use a "two-finger rotate" gesture for one of our screens. How do I implement this with Flutter?

Answer 1

I hope I'm wrong. But it doesn't seems like this has been implemented yet.

Ideally you should create a RotationGestureRecognizer that extends OneSequenceGestureRecognizer ; which can then be added in GestureDetector (and submit a cool pull request). You can use ScaleGestureRecognizer as exemple.

You could also use onPanDown , onPanUpdate and onPanEnd to keep the position of all pointers. And use the onPanUpdate delta to calculate the rotation.