[solved] catching toggle signal from bunch of QCheckBoxes ?

wally123

Hello,

i have a bunch of QCheckboxes and put them into a QVector so i can access them
easily in a for loop.
In which kind of Container or Group/ Frame widget i should pack these Checkboxes
to get a signal when any of them got toggled ?
thanks !

void SetLogLevelDlg::on_pushButton_clicked()
{
    QVector<QCheckBox*> chkBits;
    chkBits.push_back(ui->chkb_0);
    chkBits.push_back(ui->chkb_1);
    chkBits.push_back(ui->chkb_2);
    chkBits.push_back(ui->chkb_3);
    chkBits.push_back(ui->chkb_4);
    chkBits.push_back(ui->chkb_5);
    chkBits.push_back(ui->chkb_6);
    chkBits.push_back(ui->chkb_7);

    quint8 result = 0;
    for(int i=7; i>0; --i) {
        result = result | chkBits[i]->isChecked();
        result = result << 1;
    }
    result = result | chkBits[0]->isChecked();

    ui->lb_result->setText(QString::number(result));
}

tomasz3dk

Use QSignalMapper.

mchinand

I'd use QButtonGroup. This is only for handling events from the group of buttons, and not for the layout of them in your GUI.

wally123

Thank you, i will try both approaches.

wally123

Seems i got a satisfying solution, any critics highly welcome:
Advantage of the QButtonGroup-approach is e.g. "setExclusive"
(Maybe helpful for others)

header:

private slots:
    void chkBox_clicked(int, bool);

private:
    Ui::MainWindow *ui;

    QCheckBox** chkBoxes;
    QButtonGroup *butGrp;
    QCheckBox* chkBox;

source:

ui->VL_1 is a QVBoxLayout placed on fresh Form in Designer

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    chkBoxes = new QCheckBox*[8];
    butGrp = new QButtonGroup(this);

    for(int i=0; i<8; i++) {
        chkBox = new QCheckBox(QString("bit_%1").arg(i), this);
        chkBox->setObjectName(QString("bit_%1").arg(i));
        ui->VL_1->addWidget(chkBox);
        chkBoxes[i] = chkBox;
        butGrp->addButton(chkBoxes[i], i);
    }

    butGrp->setExclusive(false);
    connect(butGrp, SIGNAL(buttonToggled(int,bool)), this, SLOT(chkBox_clicked(int, bool)));

}
void MainWindow::chkBox_clicked(int _id, bool _b) {

    qDebug() << __FUNCTION__ << __LINE__ << _id << chkBoxes[_id]->objectName() << _b ;
    chkBoxes[_id]->setText("marked");

}

LuGRU

You can also do something different i.e. connect every checkbox (signal toggled(bool) to same slot and inside such slot just do:

    connect (ui->checkBox_1, SIGNAL(toggled(bool)), this, SLOT(checkBoxToggled(bool)));
    connect (ui->checkBox_2, SIGNAL(toggled(bool)), this, SLOT(checkBoxToggled(bool)));

Then in slot:

    QCheckBox *box = static_cast<QCheckBox*>( this->sender());
    if (state) {
        qDebug() << "Checked:" << box->objectName();
    }

That way You will still get access to the object. To i.e. uncheck all others You could use container -> findChildren<QCheckBox *>(); and uncheck all others. Of course above suggestions are still valid and in the end it all depends on Your need.

I personally wouldn't store list to Ui Widgets. I tend to create all my Ui's in QtDesigner and not by code so my above solution will give more flexibility.