对于在嵌入式或其它Qt项目中,事件是经常用的东西,很是方便.下面总结一些常用的例子,在例子中学习这个事件,会更快些.

    一.实现移动鼠标获取坐标

#include 
     
      #include 
      
       #include 
       
        #include 
        
         class EventLabel : public QLabel{protected:        void mouseMoveEvent(QMouseEvent *event);     //声明明三个事件函数        void mousePressEvent(QMouseEvent *event);        void mouseReleaseEvent(QMouseEvent *event);};void EventLabel::mouseMoveEvent(QMouseEvent *event)    //鼠标移动事件函数，显示出鼠标的坐标{    this->setText(QString("
         
          
Move: (%1, %2)
         ")                          .arg(QString::number(event->x()), QString::number(event->y())));}void EventLabel::mousePressEvent(QMouseEvent *event)          //按下时,获得鼠标坐标{        this->setText(QString("
         
          
Press: (%1, %2)
         ")                       .arg(QString::number(event->x()), QString::number(event->y())));}void EventLabel::mouseReleaseEvent(QMouseEvent *event)   //松开鼠标时,获取鼠标的坐标{        QString msg;        msg.sprintf("
         
          
Release: (%d, %d)
         ",                                event->x(), event->y());        this->setText(msg);}int main(int argc, char *argv[]){        QApplication app(argc, argv);        EventLabel *label = new EventLabel;        label->setWindowTitle("MouseEvent Demo");        label->resize(300, 200);        label->show();        return app.exec();}
        
       
      
     

一个小例子,就说明了鼠标事件的用法,调试这个小例子,很快就学会了.