Where to start on a graphical "tooltip"

[zarkzervo]

QGraphicsView might be a bit heavyweight for something like this. You're able to display an image in a QLabel; I'd consider that approach first.

But I'm displaying a QGraphicsItem. I will also want to update the graphics if this tool stays up to show the updated data.

And as for singleton, I came to the same conclusion. I would only allow one tooltip at a time and it should rather be updated with the current item's graphics.

[zarkzervo]

I went for the subclassing of QGraphicsView and it works like a charm. I made a singleton of it so only one would be visible and would check the placement when a new request to show the tooltip was made. I could then reuse the tooltip (for the same tool or if they would overlap) and would make a new when necessary.