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  1. Qt
  2. QTBUG-31288

EGLFS QPA plugin missing implementation for drag which causes segfault

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    Description

      EGLFS (so as minimalegl,directfb,linuxfb) is missing the implementation of drag feature and by default

      QPlatformDrag *QPlatformIntegration::drag() const

      { return 0; }

      so QGuiApplicationPrivate::platformIntegration()>drag() is 0 and it is causing crash in QDropEvent::QDropEvent() function default_action = QGuiApplicationPrivate::platformIntegration()>drag()->defaultAction(act, modifiers);

      Solution proposals:
      1., Implementing drag function to eglfs (and all the other plugins) using QSimpleDrag and add null pointer checking to QDropEvent::QDropEvent() and maybe to some other places wherever it is used.

      QPlatformDrag *QEglFSIntegration::drag() const
      {
      static QSimpleDrag *drag = 0;
      if (!drag)

      { drag = new QSimpleDrag; }

      return drag;
      }

      Works for me.

      2., Move QSimpleDrag and QBaseDrag to QtGui from QtPlatformSupport module and QPlatformIntegration::drag() would return it by default.

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            lagocs Laszlo Agocs
            qtcomsupport Qt Support
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              Resolved:

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