主页 / 问题 / 1094661
Accepted
Andrey Khan
Asked:2020-03-14 23:04:43 +0800 CST2020-03-14 23:04:43 +0800 CST

颤振函数调用

  • 772

页面来自Appbar 

Widget build(BuildContext context) {
return Scaffold(
    appBar: AppBar(
      elevation: 0.0,
      title: Text('Admin panel'),
      leading: IconButton(
        icon: Icon(Icons.menu),
        onPressed: menuButtonPressed, <<<<<<?
      ),
    ),
    body: BlocProvider<NavigationBloc>(
      create: (context) => NavigationBloc(),
      child: Stack(
        children: <Widget>[
          BlocBuilder<NavigationBloc, NavigationStates>(
            builder: (context, navigationState) {
              return navigationState as Widget;
            },
          ),
          TestMenu(),

测试菜单页面

 class _TestMenu extends State<TestMenu> with SingleTickerProviderStateMixin {
  AnimationController _animation;

  @override
  void initState() {
    _animation = AnimationController(
      value: 1,
      vsync: this,
      duration: drawerAnimationDuration,
    );

    super.initState();
  }

  @override
  void dispose() {
    _animation.dispose();
    super.dispose();
  }

  void menuButtonPressed() {
    if (_animation.isAnimating) return;
    _animation.isCompleted ? _animation.reverse() : _animation.forward();
  }

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: Tween<Offset>(
        begin: Offset(-1, 0),
        end: Offset.zero,
      ).animate(_animation),
      child: Row(
        children: <Widget>[
          Container(
            width: drawerWidth,
            decoration: BoxDecoration(
              border: Border(right: BorderSide(color: Colors.grey[300])),
            ),

menuButtonPressed隐藏和显示侧边菜单。是否可以从页面 c 调用此函数AppBar。

flutter

1 个回答

  1. Best Answer

    这是一个拐杖，但它有效：

    import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          elevation: 0.0,
          title: Text('Admin panel'),
          leading: IconButton(
            icon: Icon(Icons.menu),
            onPressed: () => _MyWidgetState.menuButtonPressed(),
          ),
        ),
        body: MyWidget(),
      ),
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget>
    with SingleTickerProviderStateMixin {
  static AnimationController _animation;

  @override
  void initState() {
    _animation = AnimationController(
      value: 1,
      vsync: this,
      duration: Duration(seconds: 0),
    );

    super.initState();
  }

  @override
  void dispose() {
    _animation.dispose();
    super.dispose();
  }

  static void menuButtonPressed() {
    if (_animation.isAnimating) return;
    _animation.isCompleted ? _animation.reverse() : _animation.forward();
  }

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: Tween<Offset>(
        begin: Offset(-1, 0),
        end: Offset.zero,
      ).animate(_animation),
      child: Row(
        children: <Widget>[
          Container(
            width: 100,
            decoration: BoxDecoration(
              color: Colors.green,
              border: Border(right: BorderSide(color: Colors.grey[300])),
            ),
          ),
        ],
      ),
    );
  }
}

    BlocProvider 不允许在具有 AppBar 的类中切换页面。

    你不擅长设计你的应用程序来做这样的事情......

    • 0

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