16 #ifndef QGSOPACITYWIDGET_H 
   17 #define QGSOPACITYWIDGET_H 
   35     Q_PROPERTY( 
double opacity READ opacity WRITE setOpacity NOTIFY opacityChanged )
 
   50     double opacity() 
const;
 
   60     void setOpacity( 
double opacity );
 
   74     void spinChanged( 
double value );
 
   79     QSlider *mSlider = 
nullptr;
 
The QgsSpinBox is a spin box with a clear button that will set the value to the defined clear value.