事件+鼠标+键盘+定时器

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#include "mylabel.h"
#include<QMoveEvent>
#include<QDebug>

MyLabel::MyLabel(QWidget *parent) :
    QLabel(parent)
{
    //设置追踪鼠标
    this->setMouseTracking(true);//默认鼠标一进来就有反应

}
 void MyLabel::mousePressEvent(QMouseEvent *ev)
 {
     int i = ev->x();
     int j = ev->y();
     //sprinf
     /*
      * QString str = QString("abc %1 ^_^ %2).arg(123).arg("mike");
      * str = abc 123 ^_^ mike
     */

     if(ev->button() == Qt::LeftButton)
     {
         qDebug() <<"left";
     }

     if(ev->button() == Qt::RightButton)
     {
         qDebug() <<"Right";
     }

     if(ev->button() == Qt::MidButton)
     {
         qDebug() <<"Mide";
     }



     QString text = QString("<center><h1>Mouse Press: (%1, %2)</h1></center>")
                           .arg(i).arg(j);

     this->setText(text);

 }

 void MyLabel::mouseReleaseEvent(QMouseEvent *ev)
 {

     QString text = QString("<center><h1>Mouse Release: (%1, %2)</h1></center>")
                           .arg(ev->x()).arg(ev->y());

     this->setText(text);
 }

 void MyLabel::mouseMoveEvent(QMouseEvent *ev)
 {
     QString text = QString("<center><h1>Mouse Move: (%1, %2)</h1></center>")
                           .arg(ev->x()).arg(ev->y());

   //  this->setText(text);
 }


 void MyLabel::enterEvent(QEvent *e)
 {
     QString text = QString("<center><h1>Mouse enter</h1></center>");

     this->setText(text);
 }
 void MyLabel::leaveEvent(QEvent *e)
 {
     QString text = QString("<center><h1>Mouse leave</h1></center>");

     this->setText(text);
 }

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#include "mywidget.h"
#include "ui_mywidget.h"
#include<QDebug>
#include<QKeyEvent>

MyWidget::MyWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::MyWidget)
{
    ui->setupUi(this);

    timerId = this->startTimer(1000);//毫秒为单位，这里是指1秒

    timerId2 = this->startTimer(500);


}

MyWidget::~MyWidget()
{
    delete ui;
}

void MyWidget::keyPressEvent(QKeyEvent *e)
{
    qDebug() << (char)e->key();

    if(e->key() == Qt::Key_A)
    {
        qDebug() << "Qt::Key_A";
    }
}

void MyWidget::timerEvent(QTimerEvent *e)
{
    if(e->timerId() == this->timerId)
   {
    static int sec = 0;
    ui->label->setText(
                QString("<center><h1>timer out: %1</h1></center>").arg(sec++)
                      );

    if(5 == sec)
    {
        this->killTimer(this->timerId);
    }
   }
    else if(e->timerId() == this->timerId2)
    {
        static int sec = 0;
        ui->label_2->setText(
                    QString("<center><h1>timer out: %1</h1></center>").arg(sec++)
                          );

    }


}

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