Where to control the QWizard button?

问题:

I'm using Qt, and I use a QWizard object which contains several pages. when it comes to a specific page, I want to hide the "Next" button first, and shows it after the user do something (such as clicking on a radiobutton...)

I want to do some customize control of the wizard when this specific page shows up. the question is, I know how to hide the button, but I don't know which function I should use. I tried the QWizardPage constructor, the initializePage function, the "show" function, but all of these function didn't work.

If I put the button control in the wizard page constructor, the program will crash since the wizard object is not there yet.

If I put it in initializePage function, some QWizard function will reset the buttons after the initializePage function, and all the customized setting will gone.

And the show function seems cannot be overwritten.

I really cannot figure out which function is usable. Is there any function like OnSetActive in MFC or Load in JAVA?? Which will be called when a page is going to shows out?

回答1:

The best solution is probably the one provided by using QWizardPage::registerField. It allows you to define mandatory fields/radio buttons/etc. and the Next and/or Finish buttons in your wizard are enabled only when all mandatory fields are filled/checked.

See http://doc.trolltech.com/4.6/dialogs-licensewizard.html for an example which makes use of this functionality.

EDIT: QWizard::button provides access to the buttons in the wizard. Have you tried something like myWizard->button(QWizard::NextButton)->setEnabled(false) ?

回答2:

To disable the next button you can subclass QWizardPage and reimplement isComplete(). When it returns true then QWizard will enable the button. The subclass has to emit the 'completeChanged()' signal when you change the state of isComplete(). The documentation for QWizardPage explains how to do it.

Possibly you could also use

parent->button(QWizard::NextButton)->setVisible(false)

to hide the button.