Flutter banner does not fit

Question

I have a problem with banner widget. To demonstrate it I have made some demonstration code. What I want is to have a banner in the top right corner of a container, but it is ugly, as it overflows its child (pls. see the attached image).

Here is my code:

class TestPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Banner(
          message: "hello",
          location: BannerLocation.topEnd,
          color: Colors.red,
          child: Container(
            margin: const EdgeInsets.all(10.0),
            color: Colors.yellow,
            height: 100,
            child: Center(child: Text("Hello, banner!"),),
          ),
        ),
      ),
    );
  }
}

I tried to play with the margin, but I still have this behavior even if margin set to 0.

How can avoid this 'banner overflow'?

Thanks a lot!

Answer 1

Just adding ClipRect to Op's code

return Scaffold(
      body: Center(
        child: ClipRect(
          child: Banner(
            message: "hello",
            location: BannerLocation.topEnd,
            color: Colors.red,
            child: Container(
              margin: const EdgeInsets.all(10.0),
              color: Colors.yellow,
              height: 100,
              child: Center(child: Text("Hello, banner!"),),
            ),
          ),
        ),
      ),
    );

Inverting the container and the banner

return Scaffold(
      body: Center(
        child: Container(
          margin: const EdgeInsets.all(10.0),

          height: 100,
          color: Colors.yellow,
          child: Banner(
            message: "hello",
            location: BannerLocation.topEnd,
            color: Colors.red,
            child: Container(


              child: Center(child: Text("Hello, banner!"),),
            ),
          ),
        ),
      ),

Adding ClipRect to inverting Container and Banner

return Scaffold(
      body: Center(
        child: ClipRect(
        child: Container(
          margin: const EdgeInsets.all(10.0),

          height: 100,
          color: Colors.yellow,

            child: Banner(
              message: "hello",
              location: BannerLocation.topEnd,
              color: Colors.red,
              child: Container(


                child: Center(child: Text("Hello, banner!"),),
              ),
            ),
          ),
        ),
      ),
    );

https://docs.flutter.io/flutter/widgets/ClipRect-class.html

Since you took the time and posted both sample code and an image, I decided to return the favor.