1.自绘控件
CustomPaint({
Key key,
this.painter, //背景层
Widget child, //中间层
this.foregroundPainter, //前景层
this.size = Size.zero, //绘制区域大小
this.isComplex = false,
this.willChange = false,
})
2.自绘接口
//自定义自己的
class MyPainter extends CustomPainter {
///paint
@override
void paint(Canvas canvas, Size size) {
//绘制内容(自己写的方法)
_setPaint(canvas, size);
}
//在实际场景中正确利用此回调可以避免重绘开销，本示例我们简单的返回true
///shouldRepaint
@override
bool shouldRepaint(CustomPainter oldDelegate) => true;
}
参考:
https://book.flutterchina.club/chapter10/custom_paint.html
网友评论