Method on_drag_timer

DSView/pv/view/viewport.cpp:2070–2095

}

void Viewport::on_drag_timer()
{   
    const int64_t offset = _view.offset();
    const double scale = _view.scale();

    if (_view.session().is_stopped_status()
        && _drag_strength != 0
        && offset < _view.get_max_offset()
        && offset > _view.get_min_offset()) 
    {
        _view.set_scale_offset(scale, offset + _drag_strength);
        _drag_strength /= DragDamping;
        if (_drag_strength != 0)
            _drag_timer.start(DragTimerInterval);
    }
    else if (offset == _view.get_max_offset() ||
             offset == _view.get_min_offset()) {
        _drag_strength = 0;
        _drag_timer.stop();
        set_action(NO_ACTION);
    }
    else if (_action_type == NO_ACTION){
        _drag_strength = 0;
        _drag_timer.stop();
    }
}

void Viewport::set_need_update(bool update)
{