Qt事件处理机制

用qt实现简单闹钟

widget.h

#ifndef WIDGET_H
#define WIDGET_H
#include<QPushButton>
#include<QTextEdit>
#include<QLabel>
#include <QWidget>
#include<QMouseEvent>
#include<QPoint>
#include<QTime>
#include<QTimer>
#include<QFont>
#include<QLineEdit>
#include<QTextToSpeech>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT
signals:
    void voice();
public:
    Widget(QWidget *parent = nullptr);
    ~Widget();
public slots:
    void time_slot();
    void btn1_slot();
    void btn2_slot();
    void voice_slot();
private:
    Ui::Widget *ui;
    QLabel *lab1;
    QPushButton *btn1;
    QPushButton *btn2;
    QTextEdit *edit1;
    QLineEdit *ledit;
    QTimer t1;
    QFont font;
    QTextToSpeech *speecher;

};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include<QDebug>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    
    ui->setupUi(this);
    lab1=new QLabel(this);
    ledit=new QLineEdit(this);
    btn1=new QPushButton(this);
    btn2=new QPushButton(this);
    edit1=new QTextEdit(this);
    btn2->setEnabled(false);
    speecher= new QTextToSpeech(this);
    QTime systime=QTime::currentTime();
    QString tm=systime.toString("hh:mm:ss");
    this->lab1->setText(tm);
    t1.start(1000);
    connect(&t1,&QTimer::timeout,this,&Widget::time_slot);
    connect(btn1,&QPushButton::clicked,this,&Widget::btn1_slot);
    connect(btn2,&QPushButton::clicked,this,&Widget::btn2_slot);
    connect(this,&Widget::voice,this,&Widget::voice_slot);
}

Widget::~Widget()
{
    delete ui;
}
void Widget::time_slot(){
    lab1->move(80,30);
    lab1->resize(200,50);
    font.setPointSize(20);
    QTime systime=QTime::currentTime();
    QString tm=systime.toString("hh:mm:ss");
    this->lab1->setText(tm);
    lab1->setFont(font);
    lab1->setAlignment(Qt::AlignCenter);
    ledit->move(lab1->width()+lab1->x()+30,30);
    ledit->resize(300,40);
    ledit->setPlaceholderText("请输入xx时xx分xx秒");
    btn1->move(ledit->x(),ledit->y()+ledit->height()+10);
    btn1->setText("开始");
    btn1->resize(80,40);
    btn2->move(btn1->width()+btn1->x()+30,btn1->y());
    btn2->resize(btn1->size());
    btn2->setText(("结束"));
    edit1->move(80,btn1->y()+btn1->height()+10);
    edit1->resize(600,400);
    QString tms=lab1->text();
    QString msg=ledit->text();
    if(tms==msg){
        emit voice();
    }
}
void Widget::voice_slot(){
    QString msg1=edit1->toPlainText();
    speecher->say(msg1.toUtf8());

}
void Widget::btn1_slot(){
    btn1->setEnabled(false);
    edit1->setEnabled(false);
    ledit->setEnabled(false);
    btn2->setEnabled(true);
}
void Widget::btn2_slot(){
    btn1->setEnabled(true);
    edit1->setEnabled(true);
    ledit->setEnabled(true);
     btn2->setEnabled(false);

}