27.Qt时钟

• myclock.h

  #ifndef MYCLOCK_H
  #define MYCLOCK_H
  
  #include <QObject>
  #include <QLCDNumber>
  #include <QWidget>
  #include <QMouseEvent>
  
  class myclock : public QLCDNumber
  {
      Q_OBJECT
  public:
      myclock(QWidget* parent=0);
      void mousePressEvent(QMouseEvent *event);
      void mouseMoveEvent(QMouseEvent *event);
  private:
      QPoint pos;
  18     bool showcolon;
  
  private slots:
      void showtime();
  };
  
  #endif // MYCLOCK_H

• myclock.cpp 1 #include "myclock.h"

  #include <QTimer>
  #include <QTime>
  #include <QPalette>
  
  myclock::myclock(QWidget* parent):QLCDNumber(parent)
  {
      //设定颜色
      QPalette p = palette();
      p.setColor(QPalette::Window,Qt::blue);
      setPalette(p);
  
      //隐藏标题,关闭按钮
      setWindowFlags(Qt::FramelessWindowHint);
      //设置透明度
      setWindowOpacity(0.5);
  
  　　    //创建事件空间
      QTimer *timer = new QTimer(this);
         //与事件绑定
      connect(timer,SIGNAL(timeout()),this,SLOT(showtime()));
         //多长时间改变一次
      timer->start(1000);
         //显示时间
      showtime();
      resize(300,120);
  }
  
  void myclock::mousePressEvent(QMouseEvent *event)
  {
  
  }
  
  void myclock::mouseMoveEvent(QMouseEvent *event)
  {
  
  }
  
  void myclock::showtime()
  {
  37     QTime time = QTime::currentTime();//当前时间
  38     QString str = time.toString("hh:mm:ss");//时间
  39     this->display(str);
  }