鼠标事件

//mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include 

#include 

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    void mouseMoveEvent(QMouseEvent *e);

    void mousePressEvent(QMouseEvent *e);

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

//mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include 

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::mouseMoveEvent(QMouseEvent *e){

    ui->label_now->setText(QString::number(e->x())+","+QString::number(e->y()));

}

void MainWindow::mousePressEvent(QMouseEvent *e){

    if(e->button()==Qt::LeftButton)

    ui->label->setText("左键"+QString::number(e->x())+","+QString::number(e->y()));

    if(e->button()==Qt::MidButton)

    ui->label->setText("中键"+QString::number(e->x())+","+QString::number(e->y()));

    if(e->button()==Qt::RightButton)

    ui->label->setText("右键"+QString::number(e->x())+","+QString::number(e->y()));

}