基于Qt事件机制中的定时器事件的闹钟设计

目标

代码

pro文件

QT       += core gui texttospeechgreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \widget.cppHEADERS += \widget.hFORMS += \widget.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

头文件

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTimerEvent>
#include <QTime>
#include <QTimer>
#include <QTextToSpeech>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();void timerEvent(QTimerEvent *e);private slots:void on_pushButton_clicked();void on_startButton_clicked();private:Ui::Widget *ui;int timeid=startTimer(1000);int alarmid;QTextToSpeech *speecher;
};
#endif // WIDGET_H

主函数

功能函数

#include "widget.h"
#include "ui_widget.h"
#include <QDebug>Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget), speecher(new QTextToSpeech) // 创建文本转语音对象
{ui->setupUi(this);this->setWindowFlag(Qt::FramelessWindowHint); // 设置窗口无边框ui->eventlabel->setAlignment(Qt::AlignCenter); // 设置事件标签居中对齐ui->alarmlabel->setAlignment(Qt::AlignCenter); // 设置闹钟标签居中对齐}Widget::~Widget()
{delete ui;delete speecher;
}// 重写时钟事件函数
void Widget::timerEvent(QTimerEvent *e)
{// 检查是否为时间更新定时器if(e->timerId()==timeid){QTime sys_time = QTime::currentTime(); // 获取当前系统时间QString t = sys_time.toString("hh:mm:ss"); // 格式化时间为字符串ui->timelabel->setText(t); // 更新时间标签的文本ui->timelabel->setAlignment(Qt::AlignCenter); }// 检查是否为闹钟定时器if(e->timerId()==alarmid){QTime sys_time = QTime::currentTime(); // 获取当前系统时间QString t = sys_time.toString("hh:mm:ss"); // 格式化时间为字符串// 检查是否到达设定的闹钟时间if(ui->settmlabel->text()==t){// 循环播放闹钟提示语音for (int i=0;i<5;i++) {speecher->say(ui->alarmlabel->text()); // 使用文本转语音播放闹钟标签的文本}}}
}// 关闭按钮的点击事件处理函数
void Widget::on_pushButton_clicked()
{this->close(); // 关闭窗口
}// 启动/关闭按钮的点击事件处理函数
void Widget::on_startButton_clicked()
{// 检查按钮文本，判断当前是启动还是关闭状态if(ui->startButton->text()=="启动"){ui->startButton->setText("关闭"); // 设置按钮文本为“关闭”alarmid=startTimer(1000); // 启动闹钟定时器，每秒触发一次}else{ui->startButton->setText("启动"); // 设置按钮文本为“启动”killTimer(alarmid); // 停止闹钟定时器}
}