qt send wheel event

blablabla
        this->setFocus();
        qApp->sendEvent(this,&e);
        qApp->processEvents();

        qDebug() << qApp->focusWidget();
        this->setFocus();
        qDebug() << qApp->focusWidget();
        qApp->sendEvent(this,&e);
        qDebug() << qApp->focusWidget();
        qApp->processEvents();
        qDebug() << qApp->focusWidget();

void myT::v() 
QPushButton(0x7fff39164f50) 
myT(0x7fff39164f20) 
-120 
myT(0x7fff39164f20) 
myT(0x7fff39164f20)

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <QApplication>
#include <QDebug>
#include <QWebView>
#include <QKeyEvent>
#include <QWheelEvent>

int main( int argc, char *argv[] )
{
    QApplication app( argc, argv );
    QWebView webview;
    webview.setUrl( QUrl("http://www.kde.org") );
    webview.show();

    app.processEvents();

    for (int i = 0; i < 1000 ; ++i ) {
        qDebug() << i;
        //QKeyEvent event(QEvent::KeyRelease, Qt::Key_Down, Qt::NoModifier );
        QWheelEvent event( QPoint(20,20), 40, Qt::NoButton, Qt::NoModifier );
        QCoreApplication::sendEvent(webview.page()->view(), &event);
        app.processEvents();
        sleep( 1 );
    }
 
    return app.exec();
}