在Flutter中,要实现SVG路径上的内阴影,可以使用CustomP
ai
nt组件和CustomP
ai
nter类。具体实现步骤如下:
创建一个CustomP
ai
nt组件,将其child设置为一个SizedBox包裹的CustomP
ai
nt组件;
创建一个自定义的CustomP
ai
nter类,在p
ai
nt方法中绘制SVG路径,并为其添加阴影效果,通过设置BlendMode实现内阴影效果;
将自定义的CustomP
ai
nter类传递给CustomP
ai
nt组件的p
ai
nter属性,更新CustomP
ai
nt组件。
以下是代码示例:
import 'package:flutter/material.dart';
class InnerShadowPainter extends CustomPainter {
final Paint _paint;
InnerShadowPainter()
: _paint = Paint()
..color = Colors.purple
..maskFilter = MaskFilter.blur(BlurStyle.normal, 10.0)
..blendMode = BlendMode.srcOut;
@override
void paint(Canvas canvas, Size size) {
final path = Path();
path.moveTo(0, size.height * 0.2);
path.quadraticBezierTo(
size.width / 2, size.height, size.width, size.height * 0.2);
path.lineTo(size.width, 0);
path.lineTo(0, 0);
path.close();
canvas.drawPath(path, _paint);
@override
bool shouldRepaint(CustomPainter oldDelegate) => true;
class InnerShadowSVG extends StatelessWidget {
@override
Widget build(BuildContext context) {
return SizedBox(
width: 200,
height: 200,
child: CustomPaint(
painter: InnerShadowPainter(),
在上面的代码中,我们创建了一个自定义的InnerShadowPainter类,其中对绘制路径进行了修改,添加了阴影效果,实现了SVG路径上的内阴影效果。然后我们将InnerShadowPainter对象传递给CustomPaint组件的painter属性中,从而实现了该效果。