Doubts with the isComplete function in the QWizard and QWizardPage

Carlavilla

Hi,

I have a couple of doubts with the QWizard and QWizardPage objects.

This is the QWizard definition:

MachineWizard::MachineWizard(QWidget *parent) : QWizard(parent) {
.
.
setPage(Page_Name, new MachineNamePage(this));
.
.
}

And this is the QWizardPage:

MachineNamePage::MachineNamePage(QWidget *parent) : QWizardPage(parent) {
.
.
descriptionNameLabel = new QLabel(tr("Select name and operating system for your new machine."));
descriptionNameLabel -> setWordWrap(true);
.
machineNameLabel = new QLabel(tr("Name") + ":");
machineNameLineEdit = new QLineEdit();
.
.
.
}

How can I enable/disable the next button when the machineNameLineEdit aren't empty?

I saw that in the QWizardPage shows the isComplete function.(https://doc.qt.io/qt-5/qwizardpage.html#isComplete)
But I don't know how to implement that function.

Can anybody show an example of the isComplete function must be?

Thanks.

SGaist

Hi and welcome to devnet,

Since your requirement seems to be "mandatory fields" like, take a look at the related paragraph in QWizard's documentation.

Carlavilla

Hi SGaist,

Thanks for the info. Yes, with the instrucction:

registerField("machine.name*", machineNameLineEdit);

It's enough to control the activation of the next button.
So, what's the difference between registerField and "isComplete" method?

SGaist

Like it's written in the documentation:

QWizard's mandatory field mechanism is provided for convenience. A more powerful (but also more cumbersome) alternative is to reimplement QWizardPage::isComplete() and to emit the QWizardPage::completeChanged() signal whenever the page becomes complete or incomplete.

The only link between both methods here is the star.

Carlavilla

Thanks for your help.
I solved my problem. :)

SGaist

Great,

Then please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)