Implementing fade-in / fade-out for a modal QDialog

[stampede]

I can't be sure (without looking at the source code) that calling hide() might be an end-run around setVisible( false )

From the docs:

Hides the widget. This function is equivalent to setVisible(false).

sources:

void QWidget::hide()
{
    setVisible(false);
}
 
void QWidget::show()
{
    bool isPopup = data->window_flags & Qt::Popup & ~Qt::Window;
    if (isWindow() && !isPopup && qApp->styleHints()->showIsFullScreen())
        showFullScreen();
    else
        setVisible(true);
}
 
void QWidget::setHidden(bool hidden)
{
    setVisible(!hidden);
}
 
// sorry i forgot this one:
void QWidget::showFullScreen()
{
    ...
    ...
    setVisible(true);
    ...
}

void QWidget::hide()
{
    setVisible(false);
}

void QWidget::show()
{
    bool isPopup = data->window_flags & Qt::Popup & ~Qt::Window;
    if (isWindow() && !isPopup && qApp->styleHints()->showIsFullScreen())
        showFullScreen();
    else
        setVisible(true);
}

void QWidget::setHidden(bool hidden)
{
    setVisible(!hidden);
}

// sorry i forgot this one:
void QWidget::showFullScreen()
{
    ...
    ...
    setVisible(true);
    ...
}

To copy to clipboard, switch view to plain text mode