QTimer与QTime实现电子时钟
人气:0使用QLCDNumber控件进行显示
QLCDNumber控件默认只显示5个字符,可以使用setDigitCount(int size)进行设置显示个数
使用Display(QString str) 设置显示内容
该函数拥有多个重载,字符 整型 浮点型都可以作为参数
效果图:
代码:头文件
#include <QLCDNumber> class NumClock : public QLCDNumber { Q_OBJECT public: explicit NumClock(QWidget *parent = nullptr); void mousePressEvent(QMouseEvent *event); void mouseMoveEvent(QMouseEvent *event); signals: public slots: void updateTime(); private: QTimer * timer; QPoint mouseOfPonit; // 鼠标坐标跟窗口左上角坐标的偏移值 bool showColon; //是否显示: };
cpp文件:
#include "numclock.h" #include <QTimer> #include <QTime> #include <QMouseEvent> #include <QDebug> NumClock::NumClock(QWidget *parent) : QLCDNumber(parent) { timer = new QTimer(this); timer->setTimerType(Qt::PreciseTimer); // 设置精度为较高精度,差距在毫秒内 timer->start(1000); connect(timer, SIGNAL(timeout()), this, SLOT(updateTime()),Qt::QueuedConnection); setWindowFlag(Qt::FramelessWindowHint); //没有面板边框标题栏的窗体 setWindowOpacity(0.5); //设置窗口的透明度 showColon = true; this->setDigitCount(8); resize(150, 100); updateTime(); setAttribute(Qt::WA_DeleteOnClose); } void NumClock::mousePressEvent(QMouseEvent *event) { if(event->button() == Qt::LeftButton){ mouseOfPonit = event->globalPos() - this->pos(); event->accept(); }else{ close(); } } void NumClock::mouseMoveEvent(QMouseEvent *event) { if(event->buttons() & Qt::LeftButton){ move(event->globalPos() - mouseOfPonit); event->accept(); } } void NumClock::updateTime() { QString timeStr = QTime::currentTime().toString("hh:mm:ss"); if(showColon){ timeStr = timeStr.replace(QString(":"), QString(" ")); qDebug() << timeStr; showColon = false; }else{ timeStr = timeStr.replace(QString(" "), QString(":")); showColon = true; qDebug() << timeStr; } display(timeStr); }
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