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  1. Qt
  2. QTBUG-46681

[REG 4.x->5.x] QPainter in paintEvent() doesn't work with Qt::WA_PaintOnScreen

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    • 71c3aab7ba (qt/qtbase/dev) 71c3aab7ba (qt/tqtc-qtbase/dev) f4eb4c5f30 (qt/qtbase/6.4) f4eb4c5f30 (qt/tqtc-qtbase/6.4) bf4517f435 (qt/tqtc-qtbase/6.2) 9caae71cfb (qt/tqtc-qtbase/5.15)

    Description

      Using QPainter in paintEvent() with attribute Qt::WA_PaintOnScreen doesn't work with Qt5 (works with Qt4).
      Console output:

      QWidget::paintEngine: Should no longer be called
QWidget::paintEngine: Should no longer be called
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1

      I know, that I can override paintEngine() and return nullptr and draw using X11 functions, but QPainter is much simpler and faster to use.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-100085 xcb: Native window does not get paint event if another window on top of it is hidden unless there is a enter/leave event somewhere

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              liaqi Liang Qi
              zaps166 Błażej Szczygieł
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                Resolved:

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