detect if the arrow button from QScrollBar is pressed

Question

Is there a signal that I can emit if the arrow button of the QScrollBar is pressed? As far as I know there is only the sliderPressed() signal. I want, if it exists, another solution from valueChanged() signal.

You want to emit or **connect to**? Because if you are emitting, means your coding your widget ie, you can creat your own signal... — trompa, May 09 '13 at 12:11
For what reason good sir?, I can't think of a reason you would need to know if a specific arrow is pressed on a slider. — , May 09 '13 at 14:02
I have implemented a grid that fetches the data from a database. When i press the arrow key i want to get the new data silmuntaneously. But when i scoll or move the slider i don't want the to get the new data until the slider is stopped. So i can't use the valueChanged() singal because this affect also the movement of the slider. — salvador, May 10 '13 at 10:34

score 1 · Answer 1 · answered Aug 16 '18 at 11:19

I had the same problem and solved it connecting the same callback function to sliderReleased() and valueChanged() and checking in the function if the slider is "down" (meaning pushed) with isSliderDown():

    slider = QtGui.QScrollBar()
    slider.valueChanged.connect(slider_callback)
    slider.sliderReleased.connect(slider_callback)

    def slider_callback():
       if slider.isSliderDown():
          pass
       else:
          print("now i am updating")

score 0 · Answer 2 · answered May 09 '13 at 12:13

All signals QScrollBar emits (inherited from QAbstractSlider) related o slider/value changed:

void    actionTriggered ( int action )
void    rangeChanged ( int min, int max )
void    sliderMoved ( int value )
void    sliderPressed ()
void    sliderReleased ()
void    valueChanged ( int value )

detect if the arrow button from QScrollBar is pressed

2 Answers2