Qt QOpenGLWidget wheelEvent strange behaviour

Question

I have the following class :

class Curve2DOpenGLWidget : public QOpenGLWidget, protected QOpenGLFunctions_3_3_Core {
Q_OBJECT   
public:

    Curve2DOpenGLWi         


        

Answer 1

From Qt documentation

Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved.

Mouse move events will occur only when a mouse button is pressed down, unless mouse tracking has been enabled with QWidget::setMouseTracking().

So you need setMouseTracking(true) in your constructor