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Asked: 2026-05-11T15:10:37+00:00

I’ve tried to create a custom widget plugin for QT Designer following this (

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I’ve tried to create a custom widget plugin for QT Designer following this (http://doc.trolltech.com/4.3/designer-creating-custom-widgets.html) tutorial and was somewhat successful. Basically, I can place my new widget in Designer, but it doesn’t draw (I get an empty square instead of whatever I try to draw in my paintEvent method, I started with some custom code but reverted to copy pasting from the tutorial when that didn’t work).

While placing the custom widget my system log fills up with:

full_path/Designer: CGAffineTransformInvert: singular matrix.

Any suggestions?

I have built the example plugin that came with the qt sdk and there were no problems.

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1 Answer

  1. without the source it’s very hard to help you. Further I would prefer Qt 4.4 – it’s much more reliable and faster.

    Here some common problems/hints:

    • your DLL / .so file is not in /plugins/designer/
    • you have a buggy paint() method
    • your app or lib is missing some libs

    Can you post your paint method?

    ciao, Chris

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