[Qt-interest] QWizardPage::wizard() overprotected?

[Niels Dekker - no return address]

Scott Aron Bloom wrote:
> Since your deriving from WizardPage anyway.. why not just overload
> wizard() and make it public?

Thanks for your reply.  So you say I'd have to override wizard() on all of my 
derived WizardPage classes, to make it public.  But then why wasn't it public 
in the first place?  I mean, what does Qt protect me against?

> That said, why do you need access to the wizard outside of the
> WizardPage?

>From within any of my pages, I need to find my way back to the status bar of 
my wizard.  Unfortunately, a QWizard cannot have a status bar, so I had to put 
it onto a QMainWindow.  Anyway, to avoid code duplication, I wrote a single 
function to get the status bar belonging to my wizard:

  // Returns the status bar, specific to my application.
  QStatusBar& getStatusBar(const QWizardPage& page)
  {
    // Get the "protected" wizard from the page.
    const QWizard* const wizard = getWizard(page);
    assert(wizard != NULL);

    // My wizard has a QMainWindow as parent.
    const QMainWindow* const mainWindow =
      dynamic_cast<const QMainWindow *>(wizard->parent());
    assert(mainWindow != NULL);

    QStatusBar* statusBar = mainWindow->statusBar();
    assert(statusBar != NULL);
    return *statusBar;
  }


Now I can directly get the status bar, from within any of my pages:
  getStatusBar(*this).showMessage(tr("Status okay!"));

Doesn't that sound reasonable to you?

Kind regards,
--
Niels Dekker
http://www.xs4all.nl/~nd/dekkerware
Scientific programmer at LKEB, Leiden University Medical Center