Anchoring a QGraphicsView to the corner of the screen

Question

I have a QGraphicsView that renders my game. This view fills the entire screen at all times. In the top right I have another QGraphicsView which I'm using as a mini-map; it sits over the game view. I want this mini-map to be anchored to the top right of the screen, always maintaining its size. This code almost works, except that the left side of the mini-map never changes (which is to be expected).

void MainWindow::resizeEvent(QResizeEvent *event)
{
    mainWindow->graphicsView->resize(event->size().width(), event->size().height());
    QRect newRect(mainWindow->miniMapGraphicsView->geometry());
    newRect.setRight(event->size().width() - 20);
    mainWindow->miniMapGraphicsView->setGeometry(newRect);
}

How can I do this?

Answer 1

When you want to position widgets in a certain way, layouts are usually the best way to do it.

Add a QFormLayout to your graphicsView and set its layoutDirection to Qt::RightToLeft. Then add your miniMapGraphicsView to the layout. Editing the properties of the mini map, set its horizontal and vertical sizePolicy to Fixed and set its minimumSize and maximumSize to the dimensions you would like it to be.

An alternative would be to use a QGridLayout and use horizontal and vertical spacers to push the mini map to any corner of the view.

NOTE: Layouts have margins set by default so if you want your widgets to align snugly at the edges, zero them out.