CODEWITHSUNDEEP
qtsignals-slots
Matthias Pospiech
Matthias Pospiech

Reputation: 3488

Qt: slot not called on manual function call

I have a checkbox with a slot called

void MainWindow::on_checkBoxPhaseUnwrap_stateChanged(int state)

This is automatically connected.

The constructor of MainWindow is like this

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

In setupWidgets I set the value of the checkbox

ui->checkBoxPhaseUnwrap->setChecked(true);

However the slot is not called, and thus the data base in the background not updated.

Once the window is shown I can click on the checkbox and the slot is called as usual. Why is it not called when I call setChecked Note: In the gui designer the default value is already checked. Is this the reason?

Upvotes: 1

Views: 170

Answers (1)

Eligijus Pupeikis
Eligijus Pupeikis

Reputation: 1125

In the gui designer the default value is already checked. Is this the reason?

Yes void QCheckBox::stateChanged(int state)

This signal is emitted whenever the checkbox's state changes, i.e., whenever the user checks or unchecks it.

That means it is not emitted if you try to change state from Qt::Checked to Qt::Checked.

Solution would be to emit signal yourself:

In setupWidgets add

emit ui->checkBoxPhaseUnwrap->stateChanged(Qt::Checked);

Upvotes: 2

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