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Text widgets and textScaleFactor property
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| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(const MyApp()); | |
| } | |
| class MyApp extends StatefulWidget { | |
| const MyApp({super.key}); | |
| @override | |
| State<MyApp> createState() => _MyAppState(); | |
| } | |
| class _MyAppState extends State<MyApp> { | |
| double _deviceTsf = 1.0; | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| builder: (context, child) { | |
| return MediaQuery( | |
| data: MediaQuery.of(context).copyWith(textScaleFactor: _deviceTsf), | |
| child: child ?? const SizedBox.shrink(), | |
| ); | |
| }, | |
| home: Scaffold( | |
| appBar: AppBar( | |
| title: Text( | |
| 'Text Scale Factor на устройстве = $_deviceTsf', | |
| textScaleFactor: 1.0, | |
| ), | |
| ), | |
| body: Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: [ | |
| const SizedBox(height: 40), | |
| const Text( | |
| 'Типа настройки размера шрифта в Accessibility', | |
| textScaleFactor: 1.0, | |
| ), | |
| Slider( | |
| value: _deviceTsf, | |
| min: 0.85, | |
| max: 1.3, | |
| divisions: 3, | |
| onChanged: (value) { | |
| setState(() { | |
| _deviceTsf = value; | |
| }); | |
| }, | |
| ), | |
| Padding( | |
| padding: const EdgeInsets.symmetric(horizontal: 10), | |
| child: Row( | |
| mainAxisAlignment: MainAxisAlignment.spaceBetween, | |
| children: const [ | |
| Text('0.85', textScaleFactor: 1.0), | |
| Text('1.00', textScaleFactor: 1.0), | |
| Text('1.15', textScaleFactor: 1.0), | |
| Text('1.30', textScaleFactor: 1.0), | |
| ], | |
| ), | |
| ), | |
| Flexible(child: MyWidget(deviceTsf: _deviceTsf)), | |
| ], | |
| ), | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| class MyWidget extends StatelessWidget { | |
| final double deviceTsf; | |
| const MyWidget({required this.deviceTsf, super.key}); | |
| @override | |
| Widget build(BuildContext context) { | |
| const defaultTextSize = 25; | |
| final defaultTextStyle = TextStyle( | |
| fontSize: defaultTextSize.toDouble(), | |
| color: Colors.black, | |
| ); | |
| const additionalTextSpans = <TextSpan>[ | |
| TextSpan( | |
| text: ' widget ', | |
| style: TextStyle(fontStyle: FontStyle.italic), | |
| ), | |
| TextSpan( | |
| text: '- size $defaultTextSize', | |
| style: TextStyle(fontWeight: FontWeight.bold), | |
| ) | |
| ]; | |
| return Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: [ | |
| Text( | |
| 'Text widget - size $defaultTextSize', | |
| textAlign: TextAlign.center, | |
| style: defaultTextStyle, // Заданный стиль текста высотой 25 | |
| ), | |
| const SizedBox(height: 20), | |
| Text.rich( | |
| textAlign: TextAlign.center, | |
| TextSpan( | |
| text: 'Text.rich', | |
| style: defaultTextStyle, // Заданный стиль текста высотой 25 | |
| children: additionalTextSpans, | |
| ), | |
| ), | |
| const SizedBox(height: 20), | |
| RichText( | |
| textAlign: TextAlign.center, | |
| text: TextSpan( | |
| text: 'RichText', | |
| style: defaultTextStyle, // Заданный стиль текста высотой 25 | |
| children: additionalTextSpans, | |
| ), | |
| ), | |
| const SizedBox(height: 20), | |
| Text( | |
| deviceTsf != 1 ? '🤔' : '👍', | |
| style: const TextStyle(fontSize: 40), | |
| ), | |
| ], | |
| ); | |
| } | |
| } |
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