文法サポートを備えた音声認識を Angular アプリケーションに追加する

import { Injectable, NgZone } from '@angular/core';
@Injectable({
  providedIn: 'root',
})
export class SpeechRecognitionService {
  recognition: any;
  isListening: boolean = false;

  constructor(private zone: NgZone) {
    const { webkitSpeechRecognition, webkitSpeechGrammarList }: IWindow = window as any;
    this.recognition = new webkitSpeechRecognition();
    this.recognition.continuous = false;
    this.recognition.interimResults = false;
    this.recognition.lang = 'en-US';

    const grammar = '#JSGF V1.0; grammar colors; public <color> = red | green | blue | yellow ;';
    const speechRecognitionList = new webkitSpeechGrammarList();
    speechRecognitionList.addFromString(grammar, 1);
    this.recognition.grammars = speechRecognitionList;
  }

  startListening(): Promise<string> {
    return new Promise((resolve, reject) => {
      if (this.isListening) {
        reject('Already listening');
      }

      this.isListening = true;

      this.recognition.onresult = (event: any) => {
        this.zone.run(() => {
          const result = event.results[0][0].transcript;
          this.stopListening();
          resolve(result);
        });
      };

      this.recognition.onerror = (event: any) => {
        this.zone.run(() => {
          this.isListening = false;
          reject(event.error);
        });
      };

      this.recognition.onend = () => {
        this.zone.run(() => {
          this.isListening = false;
        });
      };

      this.recognition.start();
    });
  }

  stopListening(): void {
    if (this.isListening) {
      this.recognition.stop();
      this.isListening = false;
    }
  }
}

interface IWindow extends Window {
  webkitSpeechRecognition: any;
  webkitSpeechGrammarList: any;
}

import { Component } from '@angular/core';
import { SpeechRecognitionService } from './speech-recognition.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  note: string = '';
  isListening: boolean = false;

  constructor(private speechRecognitionService: SpeechRecognitionService) {}

  toggleListening() {
    if (this.isListening) {
      this.speechRecognitionService.stopListening();
      this.isListening = false;
    } else {
      this.isListening = true;
      this.speechRecognitionService.startListening().then(
        (result: string) => {
          this.note = result;
          this.isListening = false;
        },
        (error: any) => {
          console.error('Speech recognition error', error);
          this.isListening = false;
        }
      );
    }
  }
}

<div class="textarea-container">
  <textarea
    maxlength="150"
    class="form-control"
    id="message-text"
    rows="3"
    [(ngModel)]="note"
  ></textarea>
  <i
    (click)="toggleListening()"
    class="mdi mdi-microphone mic-icon"
    [ngClass]="{ 'glow': isListening }"
  ></i>
</div>

.textarea-container {
  position: relative;
  display: inline-block;
}

.textarea-container textarea {
  width: 100%;
  box-sizing: border-box;
}

.mic-icon {
  position: absolute;
  top: 10px;
  right: 10px;
  cursor: pointer;
  font-size: 24px;
  color: #333;
  transition: box-shadow 0.3s ease;
}

.mic-icon.glow {
  box-shadow: 0 0 10px 2px rgba(255, 0, 0, 0.8);
}