How to create a scrollable widget using QHBoxLayout and QScrollArea - qt

Question

I am trying to create a widget with scrollable using the QHBoxLayout and QScrollArea but i am unable to succeed to create a GUI,here is my code can any one please suggest me where i need to change.
Any help would be appreciated
mainLayout = new QHBoxLayout(this);
mainLayout->setSizeConstraint(QLayout::SetMaximumSize);
QCheckBox *sam_box = new QCheckBox(this);
sam_box->setText("HAIIIIIIIIIII");
sam_box->setFixedSize(10000,10000);
QCheckBox *so_box = new QCheckBox(this);
so_box->setText("HOWWWWWWWWWWWW");
so_box->setFixedSize(150000,15000);
mainLayout->addWidget(sam_box);
mainLayout->addWidget(so_box);
QScrollArea *scrollarea = new QScrollArea(this);
scrollarea->setBackgroundRole(QPalette::Shadow);
scrollarea->setFixedSize(700,500);
scrollarea->setLayout(mainLayout);`
Here is my output screen
Thanks in advance,
Rohith.G

Answer 1

One way to achieve this is by below logic
centralwidget() -> QHBoxLayout-> QScrollArea -> QWidget-> add the check box
The code flow & comments will explain the logic in detail.
QWidget *wgt = new QWidget();//new code
wgt->setGeometry(0,0,500,500); //new code
//QHBoxLayout mainLayout = new QHBoxLayout(this);
QHBoxLayout *mainLayout = new QHBoxLayout(this->centralWidget());
mainLayout->setSizeConstraint(QLayout::SetMaximumSize);
//QCheckBox *sam_box = new QCheckBox(this);
QCheckBox *sam_box = new QCheckBox(wgt);
sam_box->setText("HAIIIIIIIIIII");
//sam_box->setFixedSize(10000,10000);
sam_box->setFixedSize(200,200); //make it small for quick testing
//QCheckBox *so_box = new QCheckBox(this);
QCheckBox *so_box = new QCheckBox(wgt);
so_box->setText("HOWWWWWWWWWWWW");
//so_box->setFixedSize(150000,15000);
so_box->setFixedSize(150,150); //make it small for quick testing
//mainLayout->addWidget(sam_box);
//mainLayout->addWidget(so_box);
QScrollArea *scrollarea = new QScrollArea();
scrollarea->setBackgroundRole(QPalette::Shadow);
//scrollarea->setFixedSize(700,500); //scroll area cant be resized
mainLayout->addWidget(scrollarea); //new code
//scrollarea->setLayout(mainLayout);
scrollarea->setWidget(wgt);
Below code will generate 30 QCheckBoxes added each ten in a vertical box layout and all the vertical layout in a horizontal box layout
QScrollArea *scrl = new QScrollArea();
scrl->setGeometry(0,0,300,300);
QWidget *wgtMain = new QWidget();
QHBoxLayout *hboxMain = new QHBoxLayout(wgtMain);
for(int iCount=0;iCount<3;iCount++){
QWidget *wgtSub = new QWidget();
QVBoxLayout *vboxSub = new QVBoxLayout(wgtSub);
for(int jCount=0;jCount<10;jCount++){
QCheckBox *chk = new QCheckBox("Check Box " + QString::number(jCount+1) + " of " + QString::number(iCount+1));
vboxSub->addWidget(chk);
}
hboxMain->addWidget(wgtSub);
}
scrl->setWidget(wgtMain);
scrl->show();