Flutter键盘快捷键管理插件new_keyboard_shortcuts的使用

发布于 1周前 作者 htzhanglong 来自 Flutter

Flutter 键盘快捷键管理插件 new_keyboard_shortcuts 的的使用

Flutter 键盘快捷键

在 Flutter 中,你可以通过 new_keyboard_shortcuts 插件来添加键盘快捷键。这个插件允许你在应用程序中定义和处理特定的键盘快捷键。

示例代码

下面是一个完整的示例代码,展示了如何使用 new_keyboard_shortcuts 插件来实现键盘快捷键功能。

import 'package:flutter/material.dart';
import 'package:new_keyboard_shortcuts/keyboard_shortcuts.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        leading: IconButton(
          icon: Icon(Icons.list),
          onPressed: () {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => SecondPage()),
            );
          },
        ),
      ),
      body: KeyBoardShortcuts(
        keysToPress: {LogicalKeyboardKey.controlLeft, LogicalKeyboardKey.keyP},
        onKeysPressed: () {
          Navigator.push(
            context,
            MaterialPageRoute(builder: (context) => SecondPage()),
          );
        },
        helpLabel: "Go to Second Page",
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text('You have pushed the button this many times:'),
              Text('${_counter}', style: Theme.of(context).textTheme.headline4),
            ],
          ),
        ),
      ),
      floatingActionButton: KeyBoardShortcuts(
        keysToPress: shortCut(BasicShortC.creation),
        onKeysPressed: _incrementCounter,
        helpLabel: "Increment",
        child: FloatingActionButton(
          onPressed: _incrementCounter,
          tooltip: 'Increment',
          child: Icon(Icons.add),
        ),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    List<String> generatedList = List.generate(100, (counter) => "Item $counter");

    return Scaffold(
      appBar: AppBar(
        title: Text("Second Page"),
      ),
      body: KeyBoardShortcuts(
        globalShortcuts: true,
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Expanded(
                child: ListView.builder(
                  itemCount: generatedList.length,
                  itemBuilder: (BuildContext ctxt, int index) {
                    return Center(
                      child: Text(generatedList[index]),
                    );
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

更多关于Flutter键盘快捷键管理插件new_keyboard_shortcuts的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter键盘快捷键管理插件new_keyboard_shortcuts的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然,以下是如何在Flutter应用中使用new_keyboard_shortcuts插件来管理键盘快捷键的一个基本示例。请注意,这个插件的具体API和用法可能会根据插件的版本有所不同,所以请参考最新的官方文档和示例代码。

首先,确保你已经在pubspec.yaml文件中添加了new_keyboard_shortcuts依赖:

dependencies:
  flutter:
    sdk: flutter
  new_keyboard_shortcuts: ^最新版本号  # 请替换为实际的最新版本号

然后运行flutter pub get来安装依赖。

接下来,我们来看一个如何在Flutter应用中设置和使用键盘快捷键的示例:

main.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Keyboard Shortcuts Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with Shortcuts, Actions {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Keyboard Shortcuts Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Press Ctrl+A to trigger an action',
              style: TextStyle(fontSize: 24),
            ),
            SizedBox(height: 20),
            KeyboardShortcutWidget(
              shortcut: LogicalKeySet(LogicalKeyboardKey.control, LogicalKeyboardKey.keyA),
              child: Text(
                'This is a shortcut target',
                style: TextStyle(fontSize: 20, color: Colors.blue),
              ),
              onPressed: () {
                ScaffoldMessenger.of(context).showSnackBar(
                  SnackBar(content: Text('Ctrl+A pressed!')),
                );
              },
            ),
          ],
        ),
      ),
    );
  }

  @override
  Map<LogicalKeySet, Intent> getShortcuts(BuildContext context) {
    return {
      LogicalKeySet(LogicalKeyboardKey.control, LogicalKeyboardKey.keyA): ActivateIntent(),
    };
  }

  @override
  Map<Type, Action<Intent>> getActions(BuildContext context) {
    return {
      ActivateIntent: CallbackAction<ActivateIntent>(
        onInvoke: (intent) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('Ctrl+A action invoked via getActions!')),
          );
        },
      ),
    };
  }
}

class KeyboardShortcutWidget extends StatelessWidget {
  final LogicalKeySet shortcut;
  final Widget child;
  final VoidCallback onPressed;

  const KeyboardShortcutWidget({
    Key? key,
    required this.shortcut,
    required this.child,
    required this.onPressed,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Focus(
      onFocusChange: (hasFocus) {
        if (hasFocus) {
          // Register the shortcut when the widget gains focus
          context.read<Shortcuts>().register(shortcut, ActivateIntent());
        } else {
          // Unregister the shortcut when the widget loses focus
          context.read<Shortcuts>().unregister(shortcut);
        }
      },
      child: GestureDetector(
        onKey: (event) {
          if (event.logicalKeySet == shortcut) {
            onPressed();
            return true; // Indicates that the event was handled
          }
          return false; // Indicates that the event was not handled
        },
        child: child,
      ),
    );
  }
}

解释

  1. 依赖项:在pubspec.yaml文件中添加了new_keyboard_shortcuts依赖。

  2. 主应用结构MyApp是一个基本的Flutter应用,包含一个主页MyHomePage

  3. 快捷键和动作

    • MyHomePage类实现了ShortcutsActions混合类。
    • getShortcuts方法定义了快捷键和它们对应的Intent
    • getActions方法定义了Intent和它们对应的动作。
  4. 自定义KeyboardShortcutWidget

    • 这是一个自定义小部件,用于包裹一个子小部件并处理键盘快捷键。
    • 当该小部件获得焦点时,它会注册快捷键;失去焦点时,它会注销快捷键。
    • 使用GestureDetectoronKey回调来检测键盘事件并执行相应的动作。
  5. 显示SnackBar:当快捷键被触发时,会显示一个SnackBar作为反馈。

请注意,由于new_keyboard_shortcuts插件的具体实现可能有所不同,你可能需要根据实际插件的API和文档进行调整。上述代码提供了一个基本的框架,展示了如何在Flutter应用中设置和使用键盘快捷键。

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