Giulia Santoiemma's questions

如何DataCell在 Flutter DataTable中右对齐每个数据？

例如，在这种情况下，我怎样才能让所有数字都右对齐？

Widget build(BuildContext context) {
  return DataTable(
    columns: const <DataColumn>[
      DataColumn(
        label: Expanded(child: Text('Name', style: TextStyle(fontStyle: FontStyle.italic))),
      ),
      DataColumn(
        label: Expanded(child: Text('Number', style: TextStyle(fontStyle: FontStyle.italic))),
      ),
    ],
    rows: const <DataRow>[
      DataRow(
        cells: <DataCell>[
          DataCell(Text('Sarah')),
          DataCell(Text('1')),
        ],
      ),
      DataRow(
        cells: <DataCell>[
          DataCell(Text('Janine')),
          DataCell(Text('100')),
        ],
      ),
      DataRow(
        cells: <DataCell>[
          DataCell(Text('William')),
          DataCell(Text('1000')),
        ],
      ),
    ],
  );
}

提前致谢！

在我的 Flutter 应用中我ThemeData声明colorSchemeSeed：

return MaterialApp(
  ...
  theme: ThemeData(
    useMaterial3: true,
    visualDensity: VisualDensity.adaptivePlatformDensity,
    colorSchemeSeed: Colors.blueGrey,
    ...
    floatingActionButtonTheme: FloatingActionButtonThemeData(
      backgroundColor: ?
    ),
  ),
  ...
);

我想重新定义使用backgroundColor颜色。在代码中的其他任何地方我都可以将此属性设置为：FloatingActionButtontertiaryContainerFloatingActionButton

backgroundColor: Theme.of(context).colorScheme.tertiaryContainer,

但是，我想直接在主题声明中重新定义此属性，这样我就不必在任何地方都这样做，也不会故意定义小部件。

可以做到吗？如果可以，用什么方法？提前谢谢！

在我的应用程序中，我有很多ElevatedButtons，我在主题中设置了样式。我需要将带有图标的样式设置为与不带图标的样式不同的样式。

这是只有一个属性的代码，但它适用于所有属性ElevatedButtons，我如何选择带有 图标的属性并给它们一个不同的属性borderRadius？

@override
Widget build(BuildContext context) {
  return MaterialApp(
    theme: ThemeData(
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(10.0),
          ),
        ),
      ),
    ),
  );
}

我快要疯了speech_to_text。

在我的应用程序中，我有各种形式，每种形式都有不同的TextFormFields. 对于每个输入，我都必须连接一个麦克风，以便我可以转录所说的内容。我已经用 basic 实现了所有内容SpeechToText，但由于各种初始化，它带来了一些问题。然后，我通过切换到插件提供的这段代码SpeechToTextProvider并从中汲取灵感来修改所有内容。

但是，我无法确保将口语文本逐字转录到输入中。这是SpeechToText通过onResult监听事件的参数来处理的，但这在提供者上不可用！

谁能帮我？万分感谢！

下面是一个表单的代码，为简单起见，只有一个输入：

class WeekForm extends StatefulWidget {
  const WeekForm({required this.week, super.key});

  final Week week;

  @override
  State<WeekForm> createState() => _WeekFormState();
}

class _WeekFormState extends State<WeekForm> {
  Week get week => widget.week;

  final _formKey = GlobalKey<FormState>(debugLabel: "WeekForm");

  final TextEditingController _learnedController = TextEditingController();
  String _lastTextChange = '';

  void _setLastTextChange(inputKey, lastText) {
    setState(() {
      _lastTextChange = lastText;
    });
  }

  void _saveLearn(week, appState) async {
    if (_formKey.currentState!.validate()) {
      week.learned = _learnedController.text;

      // save data to Firebase
      appState.setWeek(week);
    }
  }

  @override
  void initState() {
    ///fetched data from firebase showing on controller
    super.initState();
    _learnedController.text = week.learned ?? "";
    _setLastTextChange("learned", _learnedController.text);
  }

  @override
  Widget build(BuildContext context) {
    return Form(
      key: _formKey,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          // Add TextFormFields and ElevatedButton here.
          Row(
            children: [
              Expanded(
                child: TextFormField(
                  controller: _learnedController,
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                  ),
                  onChanged: (value) {
                    _setLastTextChange("learned", value);
                  },
                ),
              ),
              SpeechProvider(
                key: const ValueKey("learned"),
                controller: _learnedController,
                lastInputChange: _lastTextChange,
                setLastInputChange: _setLastTextChange,
              ),
            ],
          ),
          Consumer<ApplicationState>(
            builder: (context, appState, _) => Align(
              alignment: Alignment.bottomRight,
              child: ElevatedButton(
                onPressed: () => _saveLearn(week, appState),
                child: const Text("Save"),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

这是调用的代码SpeechToTextProvider：

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:speech_to_text/speech_to_text_provider.dart';

class SpeechProvider extends StatefulWidget {
  const SpeechProvider({
    super.key,
    required this.controller,
    required this.lastInputChange,
    required this.setLastInputChange,
  });

  final TextEditingController controller;
  final String lastInputChange;
  final void Function(String, String) setLastInputChange;

  @override
  SpeechProviderState createState() => SpeechProviderState();
}

class SpeechProviderState extends State<SpeechProvider> {
  String lastWords = '';
  String lastStatus = '';

  late SpeechToTextProvider speechProvider;

  void startListening() {
    if (speechProvider.isAvailable && speechProvider.isNotListening) {
      lastWords = '';

      speechProvider.listen(
        // I want something like this!!! but this is available only in basic SpeechToText
        onResult: resultListener,
      );
    }
  }

  void stopListening() {
    if (speechProvider.isListening) {
      speechProvider.stop();
      widget.setLastInputChange((widget.key as ValueKey<dynamic>).value, widget.controller.text);
      setState(() {});
    }
  }

  /// This callback is invoked each time new recognition results are
  /// available after `listen` is called.
  void resultListener() {
    var result = speechProvider.lastResult;

    if (result!.finalResult) {
      widget.setLastInputChange((widget.key as ValueKey<dynamic>).value, widget.controller.text);
    } else {
      setState(() {
        lastWords = result.recognizedWords;
      });
      widget.controller.text = '${widget.lastInputChange} $lastWords';
    }
  }

  @override
  Widget build(BuildContext context) {
    speechProvider = Provider.of<SpeechToTextProvider>(context);

    if (speechProvider.isNotAvailable) {
      return const Center(
        child: Text('Speech recognition not available, no permission or not available on the device.'),
      );
    }
    return MicrophoneWidget(speechProvider.isListening, startListening, stopListening, key: UniqueKey());
  }
}

class MicrophoneWidget extends StatelessWidget {
  const MicrophoneWidget(this.isListening, this.startListening, this.stopListening, {super.key});

  final bool isListening;
  final void Function() startListening;
  final void Function() stopListening;

  @override
  Widget build(BuildContext context) {
    return TapRegion(
      onTapOutside: (tap) => isListening ? stopListening() : null,
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        child: SizedBox(
          child: FloatingActionButton(
            onPressed: isListening ? stopListening : startListening,
            shape: const RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(80.0)),
            ),
            child: Icon(isListening ? Icons.mic : Icons.mic_off),
          ),
        ),
      ),
    );
  }
}