C++ Qt How to add widgets on scroll area? - c++

Question

I'm trying to show custom widgets in a scroll area, but it only shows the last one.
Scroll area contents has to change dinamicly with combo box index, and they change and show the last element too.
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
fileMenu = ui->menuBar->addMenu(tr("&Archivo"));
openFileAction = new QAction(tr("Abir archivo"), this);
connect(openFileAction,
SIGNAL(triggered()),
this,
SLOT(openFile()));
fileMenu->addAction(openFileAction);
scroll = ui-> scrollArea;
scroll->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
scroll->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
scroll->setWidgetResizable(true);
ui->stackedWidget->setCurrentIndex(0);
}
vector<product> MainWindow::filter(QString cad)
{
vector <product> tempList;
QMessageBox message;
for(size_t i(0);i<products.size();i++){
if(products.at(i).getId().contains(cad)){
product *p = new product;
p->setId(products.at(i).getId());
p->setName(products.at(i).getName());
p->setPrice(products.at(i).getPrice());
tempList.push_back(*p);
}
}
return tempList;
}
void MainWindow::loadproducts(int category){
QMessageBox message;
vector <product> tempList;
switch(category){
case Alimentos:{
tempList=filter("AB");
break;
}
case Libros:{
tempList=filter("L");
break;
}
case Electronicos:{
tempList=filter("E");
break;
}
case Hogar:{
tempList=filter("HC");
break;
}
case Deporte:{
tempList=filter("D");
break;
}
case Todos:{
tempList=products;
break;
}
default:{
break;
}
}
//THIS FOR IS SUPPOSED TO ADD WIDGETS TO SCROLL AREA
for(size_t i=0;i<tempList.size();i++){
ProductWidget *p = new ProductWidget(widget, tempList.at(i).getId(), tempList.at(i).getName(), tempList.at(i).getPrice());
scroll->setWidget(p);
}
tempList.clear();
}
Scroll area has to show 10 widgets, but it only shows the last one.

Answer 1

You can only set a widget in the QScrollArea using the setWidget() method, if another one is added it will replace the previous one. If you want to show several widgets then you must place them all within a widget, and that last widget set it in the QScrollArea. For example in your case:
// ...
QWidget *container = new QWidget;
scroll->setWidget(container);
QVBoxLayout *lay = new QVBoxLayout(container);
for(size_t i=0;i <tempList.size(); i++){
ProductWidget *p = new ProductWidget(...);
lay->addWidget(p);
}
// ...