Имитация нажатия левой кнопки мыши

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private:
    Ui::MainWindow  *ui;
 
protected:
    void mousePressEvent(QMouseEvent *);
 
private slots:
    void slotEventTest();
};
 
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QTimer>
#include <QMouseEvent>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTimer::singleShot(3000, this, SLOT(slotEventTest()));
}
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::slotEventTest()
{
    QMouseEvent mp( QEvent::MouseButtonPress, QPoint(20, 50),
                    Qt::LeftButton, Qt::NoButton, Qt::NoModifier );
    QApplication::sendEvent(this, &mp);
}
 
void MainWindow::mousePressEvent(QMouseEvent *t_event)
{
    qDebug() << "Mouse press event detected!" << t_event->pos();
    QMainWindow::mousePressEvent(t_event);
}