Flutter 文本小部件

Question

我有一个包含三个文本小部件的简单屏幕，当用户单击其中一个文本小部件时，文本应变为黑色字体文本颜色，而其他文本小部件颜色不应 change.so 我在其中提供我的代码下面以及如何在我的代码中实现，以便只有单击的文本会改变颜色。

Main.Dart file

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';

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

class myApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Demo",
      theme: ThemeData(primarySwatch: Colors.blue),
      home: HomeData(),
    );
  }
}

class HomeData extends StatefulWidget {
  @override
  _HomeDataState createState() => _HomeDataState();
}

class _HomeDataState extends State<HomeData> {
  Color _textColor1 = Colors.black;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          "Demo",
          style: TextStyle(color: Colors.white),
        ),
      ),
      body: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: EdgeInsets.all(0),
              child: InkWell(
                onTap: () {
                  filterText();
                  setState(() {
                    _textColor1 = Colors.black;
                  });
                },
                child: Text(
                  "All",
                  style: TextStyle(
                    color: Colors.black26,
                    fontSize: 20,
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 10),
              child: Text(
                "|",
                style: TextStyle(
                  color: Colors.black,
                  fontSize: 20,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.all(0),
              child: InkWell(
                onTap: () {
                  filterText();
                },
                child: Text(
                  "QR Codes",
                  style: TextStyle(
                    color: Colors.black26,
                    fontSize: 20,
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 10),
              child: Padding(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: Text(
                  "|",
                  style: TextStyle(
                    color: Colors.black,
                    fontSize: 20,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.all(0),
              child: InkWell(
                onTap: () {
                  filterText();
                },
                child: Text(
                  "Bar Codes",
                  style: TextStyle(
                    color: Colors.black26,
                    fontSize: 20,
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  void filterText() {
    String filterAllText = "All";
    setState(() {
      Fluttertoast.showToast(
          msg: "$filterAllText",
          toastLength: Toast.LENGTH_SHORT,
          gravity: ToastGravity.BOTTOM,
          backgroundColor: Colors.blue,
          textColor: Colors.white,
          fontSize: 14.0);
    });
  }
}

Answer 1

你可以试试下面的代码:

class _HomeDataState extends State<HomeData> {
  Color _textColor1 = Colors.black;
  Color _textColor2 = Colors.black26;
  bool _isCheckedAll = true;
  bool _isCheckedQr = false;
  bool _isCheckedBar = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          "Demo",
          style: TextStyle(color: Colors.white),
        ),
      ),
      body: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: EdgeInsets.all(0),
              child: InkWell(
                onTap: () {
                  setState(() {
                    _isCheckedAll = true;
                    _isCheckedQr = false;
                    _isCheckedBar = false;
                  });
                },
                child: Text(
                  "All",
                  style: TextStyle(
                    color: _isCheckedAll ? _textColor1 : _textColor2,
                    fontSize: 20,
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 10),
              child: Text(
                "|",
                style: TextStyle(
                  color: Colors.black,
                  fontSize: 20,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.all(0),
              child: InkWell(
                onTap: () {
                  setState(() {
                    _isCheckedAll = false;
                    _isCheckedQr = true;
                    _isCheckedBar = false;
                  });
                },
                child: Text(
                  "QR Codes",
                  style: TextStyle(
                    color: _isCheckedQr ? _textColor1 : _textColor2,
                    fontSize: 20,
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 10),
              child: Padding(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: Text(
                  "|",
                  style: TextStyle(
                    color: Colors.black,
                    fontSize: 20,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ),
            Padding(
              padding: EdgeInsets.all(0),
              child: InkWell(
                onTap: () {
                  setState(() {
                    _isCheckedAll = false;
                    _isCheckedQr = false;
                    _isCheckedBar = true;
                  });
                },
                child: Text(
                  "Bar Codes",
                  style: TextStyle(
                    color: _isCheckedBar ? _textColor1 : _textColor2,
                    fontSize: 20,
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

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