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Editorial Team
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Asked: 2026-06-13T21:25:51+00:00

I am trying to set up a GUI using plugins. In my current phase

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I am trying to set up a GUI using plugins. In my current phase I need the user to click and specify locations of points.

The plugin architecture I have setup requires the plugin to return QGraphicsItem that the plugin wishes to use. In the main program (which future plugin writers won’t have access to), I set a background image to guide clicks. The plugins can sneakily access the scene() using an itemChange() and installing an eventFilter() on the scene being set. This allows for the plugins to have access to scene clicks and process whatever information it needs. However, the background picture is being returned by itemAt() calls.

I wish to prevent this background Pixmap from returning with an itemAt() for all future plugins. Is this possible?

Tried:

 setEnabled(false); //No success
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1 Answer

  1. Editorial Team

    This doesn’t answer your question directly, but it should solve your problem: I suggest reimplementing QGraphicsScene::drawBackground() and drawing your pixmap there. That’s what the method is for.

    A similar approach would be to put the pixmap in a resources file, then use style sheets to set it as the background of either the QGraphicsView or its viewport widget (I think these have slightly different effects).

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