Qt5鼠标和键盘事件的简单示例

#ifndef FIRSTEVENT_H#define FIRSTEVENT_H#include <QMainWindow>#include <QMouseEvent>#include <QKeyEvent>#include <QEvent>namespace Ui {class FirstEvent;}class FirstEvent : public QMainWindow{    Q_OBJECTpublic:    explicit FirstEvent(QWidget *parent = 0);    ~FirstEvent();    //鼠标事件    void mousePressEvent(QMouseEvent *);    void mouseReleaseEvent(QMouseEvent *);    void mouseMoveEvent(QMouseEvent* e);    //键盘事件    void keyPressEvent(QKeyEvent *evt);    //evnet    bool event(QEvent *event);private:    Ui::FirstEvent *ui;};#endif // FIRSTEVENT_H

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#include "firstevent.h"#include "ui_firstevent.h"#include <QDebug>FirstEvent::FirstEvent(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::FirstEvent){    ui->setupUi(this);}FirstEvent::~FirstEvent(){    delete ui;}void FirstEvent::mousePressEvent(QMouseEvent *){    qDebug()<<"鼠标按下";}void FirstEvent::mouseReleaseEvent(QMouseEvent *){    qDebug()<<"鼠标释放";}void FirstEvent::mouseMoveEvent(QMouseEvent *e){    ui->label->move(e->pos());}void FirstEvent::keyPressEvent(QKeyEvent *evt){    int key = evt->key();//键盘键值    qDebug()<<key;    int x = ui->label->x();    int y = ui->label->y();    switch (key) {    case Qt::Key_A:    case Qt::Key_Left:        ui->label->move(x-10,y);        break;    case Qt::Key_D:    case Qt::Key_Right:        ui->label->move(x+10,y);        break;    case Qt::Key_W:    case Qt::Key_Up:        ui->label->move(x,y-10);        break;    case Qt::Key_S:    case Qt::Key_Down:        ui->label->move(x,y+10);        break;    default:        break;    }}bool FirstEvent::event(QEvent *event){    static int i=0;    //qDebug()<<"******************"<<i++;    return QMainWindow::event(event);}