Stylesheet: using background image for floating DockWidgets

Megamouse

Hi,

we use following code in our stylesheet to change the background of dockwidgets whenever they are attached/detached:

QDockWidget {
	background: transparent;
}
[floating="true"] {
	background: #b3ac98;
}

The parent uses a border-image, therefore we have the dockwidgets use a transparent background.
We would like to use the same image for the floating/detached dockwidgets as well but they just end up being all black.

Is there any regular way to achieve this?
I've seen this: https://stackoverflow.com/questions/10272091/cannot-add-a-background-image-to-a-qdockwidget
but I am not sure if there's a simpler proper way.

Thx, Megamouse

Megamouse

I noticed that the dockwidgets are missing the title when using the stackoverflow method.

mrjj

Hi
Yes if you draw it like
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
then yes. its drawn as plan widget, not a dock :)

Megamouse

I think I will try using that if floating== true.
Else I'll use the native paintEvent. I will update when I'm done

Megamouse

It works perfectly with the method I just explained.
Here the code for anybody interested: (partly taken from original post's source)

void paintEvent(QPaintEvent* event)
{
	if (isFloating())
	{
		QStyleOption opt;
		opt.init(this);
		QPainter p(this);
		style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
		return;
	}
	QDockWidget::paintEvent(event);
}

in combination with:

connect(this, &QDockWidget::topLevelChanged, [this](bool/* topLevel*/)
{
	style()->unpolish(this);
	style()->polish(this);
});

HardikB

@Megamouse I think QDockWidget::topLevelChanged() is not emitted when setting Floating property using QDockWidget::setFloating() method. As per the documentation, it should. Is anybody else getting this problem?