Empty scrollArea QT C++ - c++

Question

I am loading data from xml executed by timer. xml is parsed and populated in entity object.
In a loop im taking the data from entity object and populate QCommandLinkButton's. and in the end a batch of buttons are set into the verticalLayout and then in scrollArea.
but every time data is loaded its appends to the old data. How can I empty the content of the srollArea before repopulating scrollArea.
MainWindow::methodExecudedByTimer(){
foreach(int i, map.keys()){
QCommandLinkButton* buttonEmail = new QCommandLinkButton(this);
Email em = map[i];
buttonEmail->setText(em.__toString());
ui->verticalLayout->addWidget(buttonEmail);
}
ui->scrollArea->setLayout(ui->verticalLayout);
}

Answer 1

you can use setWidget replace setLayout.and then new data coming,you can call takeWidget to remove old data.
MainWindow::methodExecudedByTimer(){
foreach(int i, map.keys()){
QCommandLinkButton* buttonEmail = new QCommandLinkButton(this);
Email em = map[i];
buttonEmail->setText(em.__toString());
ui->verticalLayout->addWidget(buttonEmail);
}
ui->scrollArea->takeWidget();
QWidget *widget = new QWidget();
QSize size = ui->scrollArea->size();
widget->setMinimumSize(size.width(),size.height());
widget->setLayout(ui->verticalLayout);
ui->scrollArea->setWidget(widget);
}

Answer 2

I found the answer in the depths of Internet.
before foreach i added this:
qDebug() << "check if layout filled";
if(ui->verticalLayout->count() > 0){
qDebug() << "empty layout";
QLayoutItem *item = NULL;
while ((item = ui->verticalLayout->takeAt(0)) != 0) {
delete item->widget();
}
}else{
// on app first run
qDebug() << "layout empty";
}