flutter_tts_tizen 1.5.0

The Tizen implementation of flutter_tts plugin.

example/lib/main.dart

import 'dart:async';

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

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

enum TtsState { playing, stopped, paused, continued }

class _MyAppState extends State<MyApp> {
  late FlutterTts flutterTts;
  String? language;
  double volume = 0.5;
  double pitch = 1.0;
  double rate = 0.5;

  String? _newVoiceText;
  int? _inputLength;

  TtsState ttsState = TtsState.stopped;

  bool get isPlaying => ttsState == TtsState.playing;
  bool get isStopped => ttsState == TtsState.stopped;
  bool get isPaused => ttsState == TtsState.paused;
  bool get isContinued => ttsState == TtsState.continued;

  @override
  initState() {
    super.initState();
    initTts();
  }

  dynamic initTts() {
    flutterTts = FlutterTts();

    _setAwaitOptions();

    _getDefaultVoice();

    _getSupportedVoices();

    flutterTts.setStartHandler(() {
      setState(() {
        print("Playing");
        ttsState = TtsState.playing;
      });
    });

    flutterTts.setCompletionHandler(() {
      setState(() {
        print("Complete");
        ttsState = TtsState.stopped;
      });
    });

    flutterTts.setCancelHandler(() {
      setState(() {
        print("Cancel");
        ttsState = TtsState.stopped;
      });
    });

    flutterTts.setPauseHandler(() {
      setState(() {
        print("Paused");
        ttsState = TtsState.paused;
      });
    });

    flutterTts.setContinueHandler(() {
      setState(() {
        print("Continued");
        ttsState = TtsState.continued;
      });
    });

    flutterTts.setErrorHandler((msg) {
      setState(() {
        print("error: $msg");
        ttsState = TtsState.stopped;
      });
    });
  }

  Future<dynamic> _getLanguages() async => await flutterTts.getLanguages;

  Future<void> _getDefaultVoice() async {
    var voice = await flutterTts.getDefaultVoice;
    if (voice != null) {
      print('_getDefaultVoice(): $voice');
    }
  }

  Future<void> _getSupportedVoices() async {
    var voices = await flutterTts.getVoices;
    if (voices != null) {
      print('_getSupportedVoices(): $voices');
    }
  }

  Future<void> _speak() async {
    await flutterTts.setVolume(volume);
    await flutterTts.setSpeechRate(rate);

    if (_newVoiceText != null) {
      if (_newVoiceText!.isNotEmpty) {
        await flutterTts.speak(_newVoiceText!);
      }
    }
  }

  Future<void> _setAwaitOptions() async {
    await flutterTts.awaitSpeakCompletion(true);
  }

  Future<void> _stop() async {
    var result = await flutterTts.stop();
    if (result == 1) setState(() => ttsState = TtsState.stopped);
  }

  Future<void> _pause() async {
    var result = await flutterTts.pause();
    if (result == 1) setState(() => ttsState = TtsState.paused);
  }

  @override
  void dispose() {
    super.dispose();
    flutterTts.stop();
  }

  List<DropdownMenuItem<String>> getLanguageDropDownMenuItems(
      List<dynamic> languages) {
    var items = <DropdownMenuItem<String>>[];
    for (dynamic type in languages) {
      items.add(DropdownMenuItem(
          value: type as String?, child: Text((type as String))));
    }
    return items;
  }

  void changedLanguageDropDownItem(String? selectedType) async {
    var result = await flutterTts.isLanguageAvailable(selectedType!);
    if (result == 0) return;

    setState(() {
      language = selectedType;
      flutterTts.setLanguage(language!);
    });
  }

  void _onChange(String text) {
    setState(() {
      _newVoiceText = text;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Flutter TTS Tizen example app'),
        ),
        body: SingleChildScrollView(
          scrollDirection: Axis.vertical,
          child: Column(
            children: [
              _inputSection(),
              _btnSection(),
              _futureBuilder(),
              _buildSliders(),
              _getMaxSpeechInputLengthSection(),
            ],
          ),
        ),
      ),
    );
  }

  Widget _futureBuilder() => FutureBuilder<dynamic>(
      future: _getLanguages(),
      builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
        if (snapshot.hasData) {
          return _languageDropDownSection(snapshot.data as List<dynamic>);
        } else if (snapshot.hasError) {
          return Text('Error loading languages...');
        } else
          return Text('Loading Languages...');
      });

  Widget _inputSection() => Container(
      alignment: Alignment.topCenter,
      padding: EdgeInsets.only(top: 25.0, left: 25.0, right: 25.0),
      child: TextField(
        maxLines: 11,
        minLines: 6,
        onChanged: (String value) {
          _onChange(value);
        },
        controller: TextEditingController(text: _newVoiceText),
      ));

  Widget _btnSection() {
    return Container(
      padding: EdgeInsets.only(top: 50.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          _buildButtonColumn(Colors.green, Colors.greenAccent, Icons.play_arrow,
              'PLAY', _speak),
          _buildButtonColumn(
              Colors.red, Colors.redAccent, Icons.stop, 'STOP', _stop),
          _buildButtonColumn(
              Colors.blue, Colors.blueAccent, Icons.pause, 'PAUSE', _pause),
        ],
      ),
    );
  }

  Widget _languageDropDownSection(List<dynamic> languages) => Container(
      padding: EdgeInsets.only(top: 10.0),
      child: Row(mainAxisAlignment: MainAxisAlignment.center, children: [
        DropdownButton(
          value: language,
          items: getLanguageDropDownMenuItems(languages),
          onChanged: changedLanguageDropDownItem,
        ),
      ]));

  Column _buildButtonColumn(Color color, Color splashColor, IconData icon,
      String label, Function func) {
    return Column(
        mainAxisSize: MainAxisSize.min,
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          IconButton(
              icon: Icon(icon),
              color: color,
              splashColor: splashColor,
              onPressed: () => func()),
          Container(
              margin: const EdgeInsets.only(top: 8.0),
              child: Text(label,
                  style: TextStyle(
                      fontSize: 12.0,
                      fontWeight: FontWeight.w400,
                      color: color)))
        ]);
  }

  Widget _getMaxSpeechInputLengthSection() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        ElevatedButton(
          child: Text('Get max speech input length'),
          onPressed: () async {
            _inputLength = await flutterTts.getMaxSpeechInputLength;
            setState(() {});
          },
        ),
        Text("$_inputLength characters"),
      ],
    );
  }

  Widget _buildSliders() {
    return Column(
      children: [_volume(), _rate()],
    );
  }

  Widget _volume() {
    return Slider(
        value: volume,
        onChanged: (newVolume) {
          setState(() => volume = newVolume);
        },
        min: 0.0,
        max: 1.0,
        divisions: 10,
        label: "Volume: ${volume.toStringAsFixed(1)}");
  }

  Widget _rate() {
    return Slider(
      value: rate,
      onChanged: (newRate) {
        setState(() => rate = newRate);
      },
      min: 0.0,
      max: 1.0,
      divisions: 10,
      label: "Rate: ${rate.toStringAsFixed(1)}",
      activeColor: Colors.green,
    );
  }
}