Flutter mask a circle into a container
ClipRRect worked best for me.
See reference video: https://www.youtube.com/watch?v=eI43jkQkrvs&vl=en
ClipRRect(
borderRadius: BorderRadius.cirular(10),
child: myContainerWithCircleWidget,
);
The simplest way to do this is to using an overlap and cliprect.
class OverlapSquare extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Container(
height: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
color: Colors.red,
),
child: ClipRect(
clipBehavior: Clip.hardEdge,
child: OverflowBox(
maxHeight: 250,
maxWidth: 250,
child: Center(
child: Container(
decoration: BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
),
),
),
),
),
);
}
}
The OverFlowBox allows the circle to draw outside the bounds of its parent, and then the cliprect cuts it back to the edge.
Just an FYI - on my device I'm getting a tiny red line at the top & bottom of the white circle. I'm fairly sure that's a recently-introduced bug in flutter as I'm also seeing something similar if I put a white border around the container. I've raised an issue on github for that.