电子时钟QTimeQTimerQLCDNumber

Posted 2021-09-06 Respect@

电子时钟QTime、QTimer、QLCDNumber

• 电子时钟QTime、QTimer、QLCDNumber

电子时钟QTime、QTimer、QLCDNumber

clock.h

#ifndef CLOCK_H
#define CLOCK_H

#include <QDialog>

class Clock : public QDialog
{
    Q_OBJECT

public:
    Clock(QWidget *parent = 0);
    ~Clock();
};

#endif // CLOCK_H

digitalclock.h

#ifndef DIGITALCLOCK_H
#define DIGITALCLOCK_H

#include <QLCDNumber>

class DigitalClock : public QLCDNumber
{
    Q_OBJECT
public:
    DigitalClock(QWidget* parent = 0);
protected:
    void mousePressEvent(QMouseEvent* event);//鼠标按下事件
    void mouseMoveEvent(QMouseEvent* event); //鼠标移动事件
private slots:
    void showTime();       //显示当前时间
private:
    QPoint m_dragPosition; //保存鼠标点相对电子钟表窗体左上角的偏移值
    bool m_showColon;      //钟表显示“ ：”
};

#endif // DIGITALCLOCK_H

clock.cpp

#include "clock.h"

Clock::Clock(QWidget *parent)
    : QDialog(parent)
{
}

Clock::~Clock()
{

}

digitalclock.cpp

#include "digitalclock.h"
#include <QTimer>
#include <QTime>
#include <QMouseEvent>

DigitalClock::DigitalClock(QWidget* parent):QLCDNumber(parent)
{
    //设置蓝色背景
    QPalette p = palette();
    p.setColor(QPalette::Window,Qt::blue);
    setPalette(p);

    //无边框窗体风格
    setWindowFlags(Qt::FramelessWindowHint);

    //窗体透明度
    setWindowOpacity(0.5);

    QTimer *timer = new QTimer(this);
    connect(timer,&QTimer::timeout,this,&DigitalClock::showTime);
    timer->start(1000);//周期为1000毫秒（1秒）

    showTime();
    resize(150,60);
    m_showColon = true;
}

void DigitalClock::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        m_dragPosition = event->globalPos() //鼠标相对屏幕左上角的位置
                        - frameGeometry().topLeft();//时钟窗体左上角位置
        event->accept();
    }

    if(event->button() == Qt::RightButton)
    {
        close();
    }
}

void DigitalClock::mouseMoveEvent(QMouseEvent *event)
{
    if(event->buttons() & Qt::LeftButton)
    {
        move(event->globalPos() - m_dragPosition);
        event->accept();
    }

}

void DigitalClock::showTime()
{
    QTime time = QTime::currentTime();
    QString strTime = time.toString("hh:mm");
    if(m_showColon){
        strTime[2] = ':';
    }else{
        strTime[2] = ' ';
    }

    display(strTime);
    m_showColon = !m_showColon;
}

main.cpp

#include "clock.h"
#include <QApplication>
#include "digitalclock.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    DigitalClock w;
    w.show();

    return a.exec();
}