How to properly draw QComboBox's view?

Qt_User72653

I subclassed QComboBox and have overridden the paintEvent() of it, but when I filter the paintEvent of the view it's still drawing the default style.

  if(event->type() == QEvent::Paint && object == view()) {
    auto e = static_cast<QPaintEvent*>(event);
    auto painter = QPainter(view());
    painter.fillRect(e->rect(), Qt::black);
    painter.fillRect(1, 1, view()->width() - 2, view()->height() - 2,
      Qt::white);
    return true;
  }

With this code I expected to see a white view with a black border and no items in the list. But, I get the default view drawn with a black border on the bottom and right edges.

How to I prevent the view from being drawn? Shouldn't returning true from the filter prevent the default view style from being drawn?

SGaist

Hi,

If you want as custom view, it would be simpler to create your own QAbstractItemView or QListView and call setView on your combo box.

Qt_User72653

@SGaist

Thanks.

I was hoping to avoid having to create a new view for it, but if that's easier I'll give that a go.

mrjj

@Qt_User72653
Hi
Can i ask what is the goal of it ?
other background color or completely new item drawing or ?

Qt_User72653

@mrjj

New background color for hovered item
Padding for hovered item
Custom border color for top, with a different color for bottom and sides
Remove the outline for the hovered item
Custom size for list items

That's just off the top of my head, there's a few more things I'm forgetting. Some of this works with CSS, some works with quirks, and some I can't get to work at all, so, I figured I would just draw it myself rather than try to deal with the issues with CSS.

I originally considered making a custom view for it, but I didn't want to have to deal with managing items in the list; I only wanted a custom style.

mrjj

@Qt_User72653
Ah, its plenty.
Well yes, a custom view should be more optimal then.
You can use
https://code.woboq.org/qt5/qtbase/src/widgets/itemviews/qlistview.cpp.html
to have a look of handling states etc.

Qt_User72653

@mrjj

Thanks, I'll take a look.