The following application starts with a single QLineEdit.
Each time the user will press ENTER, a new LineEdit appears and I want to get the focus on it.

All those QLineEdit are in a QVBoxLayout, contained in a QScrollArea.
I want the last QLineEdit to be visible on viewport, that's why I used the method EnsureWidgetVisible from QScrollArea but I didn't succeed it to work.

Here is my code:

bug.h
@
#ifndef BUG_H
#define BUG_H
#include <QScrollArea>
#include <QVector>

class QLineEdit;
class QVBoxLayout;

class Scroll : public QScrollArea{
Q_OBJECT
public:
Scroll(QWidget *parent=0);
private slots:
void addLine();
private:
QWidget mainPanel;
int current;
QVector <QLineEdit > lines;
QVBoxLayout vLayout;
QVBoxLayout mainLayout;
};
#endif
@

bug.cpp
@
#include <QtGui>
#include "bug.h"

Scroll::Scroll(QWidget* ):QScrollArea(){
current=0;

mainPanel=new QWidget;

vLayout=new QVBoxLayout;
mainLayout=new QVBoxLayout;
QLineEdit *line=new QLineEdit(this);
connect(line,SIGNAL(returnPressed()),this,SLOT(addLine()));
lines.append(line);
vLayout->addWidget(lines.at(0));
mainLayout->addLayout(vLayout);
mainLayout->addStretch(1);
mainPanel->setLayout(mainLayout);
mainPanel->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);

setWidget(mainPanel);
setWidgetResizable(true);

lines.last()->setFocus(Qt::OtherFocusReason);

}
void Scroll::addLine(){
QLineEdit *line=new QLineEdit(this);
connect(line,SIGNAL(returnPressed()),this,SLOT(addLine()));
lines.append(line);
vLayout->addWidget(line);
line->setFocus(Qt::OtherFocusReason);
line->show();
ensureWidgetVisible(line);
}
@

and main.cpp
@#include <QApplication>
#include "bug.h"

int main(int argc, char* argv[]){
QApplication app(argc,argv);
Scroll *s=new Scroll;
s->show();
return (app.exec());

}
@

If anyone has encountered this problem, thanks in advance for your help.
Best,