QT作业4

1、思维导图

2、使用定时器完成闹钟

头文件：
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QLineEdit>
#include <QLabel>
#include <QPushButton>
#include <QTextEdit>
#include <QDebug>
#include <QTimer>
#include <QTime>
#include <QTimerEvent>
#include <QDateTime>
#include <QTextToSpeech>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTQLabel *Lab;QLineEdit *linEdit;QPushButton *btn1;QPushButton *btn2;QTextEdit *textEdit;
public:Widget(QWidget *parent = nullptr);~Widget();QTextToSpeech *speech;
private slots:void btn1_clicked();void btn2_clicked();void timerEvent(QTimerEvent *event) override;
private:Ui::Widget *ui;QTimer timer;int tid=0;
};
#endif // WIDGET_H

源文件：
#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{speech = new QTextToSpeech(this);ui->setupUi(this);this->resize(800,500);this->setFixedSize(800,500);this->Lab=new QLabel(this);Lab->resize(380,150);Lab->move(20,20);Lab->setStyleSheet("background-color:yellow");Lab->setStyleSheet("font:56pt");this->linEdit=new QLineEdit(this);linEdit->resize(350,70);linEdit->move(420,20);linEdit->setStyleSheet("font:20pt");this->btn1=new QPushButton("开始",this);btn1->resize(155,70);btn1->move(420,100);this->btn2=new QPushButton("停止",this);btn2->resize(155,70);btn2->move(620,100);this->textEdit=new QTextEdit(this);textEdit->resize(760,240);textEdit->move(20,200);textEdit->setStyleSheet("font:20pt");QObject::connect(btn1,&QPushButton::clicked,this,&Widget::btn1_clicked);QObject::connect(btn2,&QPushButton::clicked,this,&Widget::btn2_clicked);}Widget::~Widget()
{delete ui;
}void Widget::btn1_clicked()
{if(this->btn1->text()=="开始"){tid=this->startTimer(1000);}
}
void Widget::btn2_clicked()
{if(this->btn2->text()=="停止"){this->killTimer(tid);}
}void Widget::timerEvent(QTimerEvent *event)
{if(event->timerId()==tid){QDateTime sysDateTime=QDateTime::currentDateTime();QString dataTime=sysDateTime.toString("hh/mm/ss");this->Lab->setText(dataTime);if(dataTime==linEdit->text()){speech->say(textEdit->toPlainText());}}
}

效果图：