Flutter Circle Menu onPressed Action

如何解决Flutter Circle Menu onPressed Action

我是 Flutter 的初学者，我用 Flutter 创建了一个圆形菜单，里面有 6 个按钮，我想根据点击的按钮转到不同的页面。我知道如何导航到另一个页面，但问题是我只能使用 1 个操作（“关闭操作”）。也许我可以在 onPressed 的 _buildbutton 上提出一个论点？

import 'package:flutter/material.dart';
import 'dart:math';
import 'package:vector_math/vector_math.dart' show radians;
import 'package:font_awesome_flutter/font_awesome_flutter.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          backgroundColor: Color(0xFFB3E5FC),body: SizedBox.expand(child: RadialMenu())),);
  }
}

class RadialMenu extends StatefulWidget {
  createState() => _RadialMenuState();
}

class _RadialMenuState extends State<RadialMenu>
    with SingleTickerProviderStateMixin {
  AnimationController controller;

  void initState() {
    super.initState();
    controller =
        AnimationController(duration: Duration(milliseconds: 900),vsync: this);
  }

  Widget build(BuildContext context) {
    return RadialAnimation(controller: controller);
  }
}

class RadialAnimation extends StatelessWidget {
  RadialAnimation({Key key,this.controller})
      : scale = Tween<double>(
          begin: 1.5,end: 0.0,).animate(
          CurvedAnimation(parent: controller,curve: Curves.fastOutSlowIn),),translation = Tween<double>(
          begin: 0.0,end: 100.0,curve: Curves.linear),rotation = Tween<double>(begin: 0.0,end: 360.0).animate(
          CurvedAnimation(
              parent: controller,curve: Interval(
                0.0,0.7,curve: Curves.decelerate,)),super(key: key);

  final AnimationController controller;
  final Animation<double> scale;
  final Animation<double> translation;
  final Animation<double> rotation;

  build(context) {
    return AnimatedBuilder(
        animation: controller,builder: (context,builder) {
          return Transform.rotate(
              angle: radians(rotation.value),child: Stack(alignment: Alignment.center,children: [
                _buildButton(0,color: Color(0xFF29B6F6),icon: FontAwesomeIcons.chartBar),_buildButton(60,icon: FontAwesomeIcons.clipboard),_buildButton(120,_buildButton(180,icon: FontAwesomeIcons.book),_buildButton(240,icon: FontAwesomeIcons.arrowsAltV),_buildButton(300,icon: FontAwesomeIcons.phoneAlt),_buildButton(360,icon: FontAwesomeIcons.compressAlt),Transform.scale(
                  scale: scale.value - 1.5,child: FloatingActionButton(
                      child: Icon(FontAwesomeIcons.timesCircle),onPressed: _close,backgroundColor: Color(0xFF29B6F6)),Transform.scale(
                  scale: scale.value,child: FloatingActionButton(
                      child: Icon(FontAwesomeIcons.solidDotCircle),onPressed: _open,]));
        });
  }

  _buildButton(double angle,{Color color,IconData icon}) {
    final double rad = radians(angle);
    return Transform(
        transform: Matrix4.identity()
          ..translate(
              (translation.value) * cos(rad),(translation.value) * sin(rad)),child: FloatingActionButton(
            child: Icon(icon),backgroundColor: color,onPressed: _close));
  }

  _open() {
    controller.forward();
  }

  _close() {
    controller.reverse();
  }
}

解决方法

在您的 _buildButton 中，您可以执行这样的操作回调

_buildButton(double angle,Function callback,{Color color,IconData icon}) {
    // ...
}

然后通过构建按钮，您可以传递 _open 或 _close