Hi,

as already discussed here and here it should be possible to paint modify the appearance of the QRubberBand by making a subclass and overwriting the paintEvent. The rubberband should be displayed on QGraphicsView to select some items on a QGraphicsScene. I'm able to modify the frame color but the background of the rubber band rect remains completely transparent (white). Here is my implementation of the QRubberBand subclass

Qt Code: 
  1. #include "SelectionFrame.h"
  2. #include <QPaintEvent>
  3. #include <QPainter>
  4. #include <QDebug>
  5.  
  6. SelectionFrame::SelectionFrame(Shape shape, QWidget *parent) :
  7.     QRubberBand(shape, parent)
  8. {
  9.     _border_color = QColor(0, 83, 235);
  10.     _background_color = QColor(51, 122, 255);
  11. }
  12.  
  13. SelectionFrame::~SelectionFrame()
  14. {
  15. }
  16.  
  17. void SelectionFrame::paintEvent(QPaintEvent *event)
  18. {
  19.     Q_UNUSED(event);
  20.  
  21.     QPainter painter;
  22.     QPen pen = QPen(_border_color);
  23.     pen.setWidth(5);
  24.     pen.setStyle(Qt::DashLine);
  25.  
  26.     QBrush brush = QBrush(_background_color);
  27.  
  28.     painter.begin(this);
  29.     painter.setPen(pen);
  30.     painter.setOpacity(0.5);
  31.     painter.setBrush(brush);
  32.     painter.drawRect(event->rect());
  33.     painter.end();
  34. }
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As the painter's pen has been set to dashed, I think I can see, that there is an additional border painted on top of the dashed line with the correctly set transparency. The background is however not painter. Does anyone have a suggestion how this can be done right?