[英]Create a rounded button / button with border-radius in Flutter
[英]How to create curved widget without using border-radius in flutter
这是一个如何使用CustomClipper
实现它的CustomClipper
class ClippingApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: ClipPath(
clipper: CurvedBottomClipper(),
child: Container(
color: Colors.lightGreen,
height: 250.0,
child: Center(
child: Padding(
padding: EdgeInsets.only(bottom: 50),
child: Text(
"Curved View",
style: TextStyle(
fontSize: 25,
color: Colors.white,
),
),
)),
),
),
);
}
}
class CurvedBottomClipper extends CustomClipper<Path> {
@override
Path getClip(Size size) {
// I've taken approximate height of curved part of view
// Change it if you have exact spec for it
final roundingHeight = size.height * 3 / 5;
// this is top part of path, rectangle without any rounding
final filledRectangle =
Rect.fromLTRB(0, 0, size.width, size.height - roundingHeight);
// this is rectangle that will be used to draw arc
// arc is drawn from center of this rectangle, so it's height has to be twice roundingHeight
// also I made it to go 5 units out of screen on left and right, so curve will have some incline there
final roundingRectangle = Rect.fromLTRB(
-5, size.height - roundingHeight * 2, size.width + 5, size.height);
final path = Path();
path.addRect(filledRectangle);
// so as I wrote before: arc is drawn from center of roundingRectangle
// 2nd and 3rd arguments are angles from center to arc start and end points
// 4th argument is set to true to move path to rectangle center, so we don't have to move it manually
path.arcTo(roundingRectangle, pi, -pi, true);
path.close();
return path;
}
@override
bool shouldReclip(CustomClipper<Path> oldClipper) {
// returning fixed 'true' value here for simplicity, it's not the part of actual question, please read docs if you want to dig into it
// basically that means that clipping will be redrawn on any changes
return true;
}
}
你可以有圆形容器,你可以试验如何在屏幕上放置它
Container(
width: double.infinity,
height: 500,
decoration: new BoxDecoration(
color: Colors.green,
shape: BoxShape.circle,
),
child: Text('Curved View'),
alignment: Alignment.center,
)
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