Qt学习——电子时钟 .

 

中间的冒号是一秒闪烁一次

新建一个继承自QLCDNumber的类

头文件：

#ifndef DIGICLOCK_H
#define DIGICLOCK_H

#include <QLCDNumber>

class DIgiClock : public QLCDNumber
{
    Q_OBJECT
public:
    DIgiClock(QWidget *parent = 0);
    void mousePressEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
public slots:
    void ShowTime();
private:
    QPoint dragPosition;
    bool showColon;
};

#endif // DIGICLOCK_H

#ifndef DIGICLOCK_H #define DIGICLOCK_H #include <QLCDNumber> class DIgiClock : public QLCDNumber { Q_OBJECT public: DIgiClock(QWidget *parent = 0); void mousePressEvent(QMouseEvent *); void mouseMoveEvent(QMouseEvent *); public slots: void ShowTime(); private: QPoint dragPosition; bool showColon; }; #endif // DIGICLOCK_H
源文件：

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

DIgiClock::DIgiClock(QWidget *parent) :
    QLCDNumber(parent)
{
    QPalette p=palette();
    p.setColor(QPalette::Window,Qt::blue);
    setPalette(p);

    setWindowFlags(Qt::FramelessWindowHint);
    setWindowOpacity(0.5);

    QTimer *timer=new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(ShowTime()));
    timer->start(500);
    ShowTime();
    resize(150,60);
    showColon=true;
}

void DIgiClock::ShowTime()
{
    QTime time=QTime::currentTime();
    QString text=time.toString("hh:mm");
    if(showColon)
    {
        text[2]=':';
        showColon=false;
    }
    else
    {
        text[2]=' ';
        showColon=true;
    }
    display(text);
}

void DIgiClock::mousePressEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton)
    {
        dragPosition=event->globalPos()-frameGeometry().topLeft();
        event->accept();
    }
    else if(event->button()==Qt::RightButton)
    {
        close();
    }
}
void DIgiClock::mouseMoveEvent(QMouseEvent *event)
{
    move(event->globalPos()-dragPosition);
    event->accept();
}