Library preview button and BPM widget don't style correctly

[Owen Williams]

The library preview button has the following code to set the background color when the widget is selected:

if (option.state == QStyle::State_Selected) {
        painter->fillRect(option.rect, option.palette.base());
    }

However with skins that try to specify custom colors for the library, this is not the right color. Instead this widget should try to load the background-color style from this CSS block:

QTableView::item:selected {
  color: #cfb32c;
  background-color: #725309;
}

Similarly, the BPM widget doesn't do any background styling so it sticks out like a sore thumb. It doesn't have a transparent background so it can't show the alternating row colors, and the widget doesn't highlight. -- see attachment.

[jus (jus)]

BPM widget acts also weird cross-platform, see lp:1201079

[jus (jus)]

Ups, we cross-posted at the same time in each bug :-)

[RJ Skerry-Ryan (rryan)]

BPM widget should be all set now.

> Instead this widget should try to load the background-color style from this CSS block:

That sort of thing isn't possible except for a few narrow circumstances since everything is hidden inside Qt's implementation. You have to study the internals until you find a route to get at what you want.

As for the preview column, I think this fixes it:
QTableView {
   selection-color: #cfb32c;
  selection-background-color: #725309;
}

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/7350