How to bind a event handler to qtCheckbox

[thuanvh]

Hi all,
I'm newbie with Qt.
Now, I'm writing a program generate a list of checkbox. With each checkbox, I want to bind it with a checked event.
Is there a way to do this? How to create a event delegate and bind a handler to a checkbox in the fly?

Thanks.

[tobias.hunger]

Sorry, I do not understand what you want to do.

[thuanvh]

Sorry for my english.
In fact, I want to create a list of checkbox dynamically, in the fly.
I want that when I click any checkbox, only one function is called.
So, is it clear? I don't know how to connect the function executing and the checkbox created.

[tobias.hunger]

So where is the problem? You create some checkboxes and connect their checked() signal to some slot... nothing tricky there.

You might want to use a QSignalMapper or sender() to find out which checkbox has triggered the signal.

[andre]

What you might do, is use QSignalMapper to create something like this:

@
//piece of code that creates the checkboxes
QSignalMapper* mapper = new QSignalMapper(this);

for (int i(0); i< 10; ++i) {
QCheckBox* cb = new QCheckBox(this);
// put cb in a layout or something like that
connect(cb, SIGNAL(toggled ( bool checked )), mapper, SLOT(map()));
mapper->setMapping(cb, i);
}

connect(mapper, SIGNAL(mapped(int)), this, SLOT(checkboxClicked(int)));

// and later on:
void MyClass::checkboxClicked(int checkboxId)
{
//do something
}
@

Of course, you can also choose one of the other mappings if those are more convenient for you. You can map to an int, to a QString, to a QObject* or to a QWidget*.

[thuanvh]

Thanks, I've done it.
It's better to change "toggled ( bool checked )" to "stateChanged(int)" for checkbox.

@connect(cb, SIGNAL( stateChanged(int) ), mapper, SLOT(map()));@

Thank all.

[kanakas]

Hi, i am new to qt.

I have create a same function as andre but i cant find a way the get the value of the checkbox that was clicked.

@QSignalMapper* mapper = new QSignalMapper(this);
QMultiMap<QString, QString>::iterator a = examination.find("test_id");
while (a != examination.end() && a.key() == "test_id") {
QCheckBox* cb = new QCheckBox(a.value(),this);
_layout2->addWidget(cb);
xml.readNextStartElement();
++a;
connect(cb, SIGNAL( stateChanged(int) ), mapper, SLOT(map()));
mapper->setMapping(cb, i);
}

_layout2->addWidget(kataxwrisi);
connect(kataxwrisi,SIGNAL(clicked()),this,SLOT(ReadXMLFile()));
connect(mapper, SIGNAL(mapped(QString)), this, SLOT(checkboxClicked(QString)));
}

void QXSRExample::checkboxClicked(QString checkbox){

}@

for example if the first checkbox has the value "A" i want to know..
what can i do?