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  1. Qt
  2. QTBUG-111726

Stylesheet border-radius alpha channel colour issues

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P4: Low P4: Low
    • None
    • 5.15.7, 6.4.2
    • GUI: Painting
    • None
    • Windows

      May be a duplicate of: https://bugreports.qt.io/browse/QTBUG-45577

      QPushButton pushBtn; 
pushBtn.setFixedHeight(100); 
pushBtn.setFixedWidth(100);
pushBtn.setStyleSheet(R"(
QPushButton {
    color: "white";
    border: 10px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    background: "black";
    padding: 5px;
}
)");

      Result:

      Replacing:

      https://github.com/qt/qtbase/blame/2b94453cbdab5c691c830ff539e81408d5330e3b/src/gui/painting/qcssutil.cpp#L107

      With:

      pen.setCapStyle(Qt::FlatCap);

      Fixes the issue as it stops the overlapping, but not sure of the side effects, the comment implies that it was there for a reason.

      Thoughts?

        1. image-2023-03-03-15-35-51-701.png
          image-2023-03-03-15-35-51-701.png
          5 kB
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            vgt Eirik Aavitsland
            tummon Cathal Tummon
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              Created:
              Updated:

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