Qt How to know when a checkbox is selected when created dynamically? - qt

Question

I am trying to dynamically create a checkbox for each restaurant in a vector. I was able to dynamically create checkboxes, but I would then like to know which ones were selected. Here is my code:
for(unsigned int i = 0; i < restaurantList.size(); i++)
{
QCheckBox *thisCheckBox = new QCheckBox(restaurantList.at(i).GetName());
CTui->verticalLayout->addWidget(thisCheckBox);
}
I currently have 5 restaurants filled in the vector, and as of now I have it look something like this:
() McDonalds
() Papa John's
() Burger King
() Dominos
() Taco Bell
When they click an "OK" button, I would like to know which ones were selected. They are all called thisCheckBox, so I don't know how to get each specific one. How can I do this? Any help is much appreciated!

Answer 1

A simple way to achieve your goal is to amend the creation loop like this:
// Add this to your widget's class declaration:
std::vector<QCheckBox*> checkBoxes;
then
for (auto& r : restaurantList) {
auto cb = new QCheckBox(r.GetName());
checkBoxes.push_back(cb);
connect(cb, &QCheckBox::stateChanged, this, &YourWidget::onCheckBoxClicked);
CTui->verticalLayout->addWidget(cb);
}
then add a handler function to YourWidget (whatever it may be) like this:
void YourWidget::onCheckBoxClicked(int state)
{
// If you wanted to work with the specific checkbox clicked:
// Use QObject::sender() to retrieve a pointer to the QCheckBox,
// and cast it from QObject* to QCheckBox*:
// auto cb = qobject_cast<QCheckBox*>(sender());
// Otherwise, if you don't care which, and want to work with them all:
// Loop over all your checkboxes, doing whatever you want:
for (auto cb : checkBoxes) {
qDebug() << "The checkbox with text" << cb->text() << "has state" << state;
}
}
Add this to the slots in the declaration of YourWidget.