QT语音播报闹钟

#ifndef HOMEWORK_MAINWINDOW_H
#define HOMEWORK_MAINWINDOW_H

#include <QWidget>
#include <QEvent>
#include <QMessageBox>
#include <QtTextToSpeech/QtTextToSpeech>


QT_BEGIN_NAMESPACE
namespace Ui {
  class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QWidget {
  Q_OBJECT

public:
  explicit MainWindow(QWidget *parent = nullptr);
  ~MainWindow() override;

private:
  Ui::MainWindow *ui;
  QTextToSpeech *tts;
  bool countdown_flag; // 是否在倒计时状态
  bool inspeech_flag;  // 是否在播报状态
  int clock_id;  // 时钟定时器的 id
  int count_id;  // 倒计时定时器的 id
  void timerEvent(QTimerEvent *event) override;

public slots:
  void onStartBtnClicked();
  void onStopBtnClicked();
};


#endif//HOMEWORK_MAINWINDOW_H

#include "mainwindow.h"
#include "ui_MainWindow.h"

MainWindow::MainWindow(QWidget *parent) :
      QWidget(parent), ui(new Ui::MainWindow),
      countdown_flag(false), inspeech_flag(false) {

  this->clock_id = this->startTimer(1000);
  tts = new QTextToSpeech(this);
  tts->setLocale(QLocale::Chinese);
  ui->setupUi(this);

  ui->timeEdit->setDisplayFormat("yyyy-MM-dd HH:mm:ss");
  ui->timeEdit->setAlignment(Qt::AlignCenter);
  // 给 TimeEdit 设置当前时间
  ui->timeEdit->setCalendarPopup(true);
  ui->timeEdit->setMinimumDate(QDate::currentDate());
  ui->timeEdit->setTime(QTime::currentTime());
  // 给按钮设置初始状态
  ui->stopBtn->setEnabled(false);
  // 给按钮点击绑定槽函数
  connect(ui->startBtn, &QPushButton::clicked, this, &MainWindow::onStartBtnClicked);
  connect(ui->stopBtn, &QPushButton::clicked, this, &MainWindow::onStopBtnClicked);
}

MainWindow::~MainWindow() {
  delete ui;
}

void MainWindow::onStartBtnClicked() {
  // 获取倒计时的时间
  QTime t = ui->timeEdit->time();
  if (t < QTime::currentTime()) {
    QMessageBox::warning(this, "警告", "倒计时时间不能小于当前时间");
    return;
  }// else...
  // 设置倒计时标志
  this->countdown_flag = true;
  ui->startBtn->setEnabled(false);
  ui->stopBtn->setEnabled(true);
  ui->timeEdit->setEnabled(false);
  ui->textEdit->setEnabled(false);
  // 开始倒计时
  this->count_id = this->startTimer(1000);
}

void MainWindow::onStopBtnClicked() {
  // 停止倒计时
  this->killTimer(this->count_id);
  this->count_id = 0;
  // 恢复按钮状态
  ui->startBtn->setEnabled(true);
  ui->stopBtn->setEnabled(false);
  ui->timeEdit->setEnabled(true);
  ui->textEdit->setEnabled(true);
  // 恢复时钟
  this->countdown_flag = false;
}

void MainWindow::timerEvent(QTimerEvent *event) {
  QTime now = QTime::currentTime();
  if (event->timerId() == clock_id) { // 每秒都会执行
      // 如果不在倒计时状态就刷新显示时间
      if (!countdown_flag) {
         QString t_str = now.toString("hh:mm:ss");
         ui->timeLabel->setText(t_str);
       }
      // 如果在播报状态但播报已经结束，切换状态
      if (inspeech_flag && QTextToSpeech::Speaking != tts->state()) {
          inspeech_flag = false;
          // 恢复按钮状态
          ui->startBtn->setEnabled(true);
          ui->stopBtn->setEnabled(false);
          ui->timeEdit->setEnabled(true);
          ui->textEdit->setEnabled(true);
          // 恢复时钟
          this->countdown_flag = false;
      }
  } else if (event->timerId() == count_id) {
    QTime t = ui->timeEdit->time();
    if (now >= t) {
      // 倒计时结束
      this->killTimer(this->count_id);
      this->count_id = 0;
      // 播放语音
      QString text = ui->textEdit->toPlainText();
      tts->say(text);
      this->inspeech_flag = true;
    } else {
      // 倒计时未结束
      int secs = QTime::currentTime().secsTo(ui->timeEdit->time());
      QString secs_str = QString::number(secs);
      ui->timeLabel->setText("倒计时：" + secs_str);
    }
  }
}