如何在图例图上取 isVisible true

Question

how to take isVisible true on the legend graph, below is the code

legend: const Legend(
         isVisible: true,
         position: LegendPosition.bottom,
       ),

Later the value will be connected to an inkwell or button to display a line on the graph

我想将它应用到下面的代码中，如果按下代码中的代码，它会在图例中显示 isVisible true 的图形。下面的示例代码， 填充（ 填充： 常量 EdgeInsets.all(14.0), 孩子：墨水井（ onTap: () {}, 子：图像.asset( '资产/图像/图片.png', 宽度：20， 身高：30， ), ), ),

我已经在每个按钮上实现了 inkwell，我还不知道实现，目前我正在从 Flutter 文档或其他参考资料中学习

Answer 1

我不确定在哪里可以找到这个图例小部件。下面给出了示例代码。您可以将可见性更改小部件而不是图例放在示例中。

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool isVisible = false;

  void _changeVisibility() {
    setState(() {
      isVisible = !isVisible;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
          child: const Legend(
        isVisible: isVisible,
        position: LegendPosition.bottom,
      )),
      floatingActionButton: FloatingActionButton(
        onPressed: _changeVisibility,
        tooltip: 'Make visible',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}