[solved] foreach (QPushButton, QVBoxLayout) question ?

deleted28

The following code adds Pushbuttons to QVBoxLayout:
@void MainWindow::on_pb_test_1_clicked() {

vlw_1 = new QWidget(this);
vlw_1->setObjectName(QString::fromUtf8("vlW_1"));
vlw_1->setGeometry(QRect(10, 10, 40, 200));

vl_1 = new QVBoxLayout(vlw_1);
vl_1->setSpacing(6);
vl_1->setContentsMargins(11, 11, 11, 11);
vl_1->setObjectName(QString::fromUtf8("vl_1"));
vl_1->setContentsMargins(0, 0, 0, 0);

for (int i=0; i<5;i++) {
    pb_x = new QPushButton(vlw_1);
    pb_x->setObjectName(QString("pb_x%1").arg(i));
    pb_x->setText(QString("x%1").arg(i));
    pb_x->setCheckable(true);
    vl_1->addWidget(pb_x);
}

vlw_1->setStyleSheet("QPushButton:checked{color: green; background-color: red;}");
vlw_1->show();

}@

in another function i want to access all this Pushbuttons in this QVBoxLayout using 'foreach'

@void MainWindow::on_pb_test_2_clicked() {

qDebug() << vl_1->count();
qDebug() << vlw_1->children().count();

foreach(QPushButton *x, ??? ) {

    // do something on each Pushbutton
}@

By what should be "???" substituted ?

sierdzio

Nothing: it will not work with QLayout.

But you can use "QObject::findChildren()":http://qt-project.org/doc/qt-5/qobject.html#findChildren to get all QPushButtons and iterate over the list that is returned.

deleted28

@void MainWindow::on_pb_test_2_clicked() {

QList<QPushButton*> bList = vlw_1->findChildren<QPushButton*>();

foreach(QPushButton *x, bList) 
{
    qDebug() << x->objectName() ;
}

}@
works nice on the QWidget vlw_1. Maybe my fist foreach approach works on QWidget ?

sierdzio

"foreach" works on container classes, that is:

QList
QStringList
QMap
QHash
QVector
probably some more (QQueue, QMultiHash, etc.)

it does not work on QWidget or QLayout by itself. But when you have - for example - a list of widgets, then it is a different story (and a happy one: see the solution that works for you :)).