Method onScrolled

core/ui/UIScrollViewBar.cpp:238–272

}

void ScrollViewBar::onScrolled(const Vec2& outOfBoundary)
{
    if (_autoHideEnabled)
    {
        _autoHideRemainingTime = _autoHideTime;
        ProtectedNode::setOpacity(_opacity);
    }

    Layout* innerContainer = _parent->getInnerContainer();

    float innerContainerMeasure  = 0;
    float scrollViewMeasure      = 0;
    float outOfBoundaryValue     = 0;
    float innerContainerPosition = 0;
    if (_direction == ScrollView::Direction::VERTICAL)
    {
        innerContainerMeasure  = innerContainer->getContentSize().height;
        scrollViewMeasure      = _parent->getContentSize().height;
        outOfBoundaryValue     = outOfBoundary.y;
        innerContainerPosition = -innerContainer->getPositionY();
    }
    else if (_direction == ScrollView::Direction::HORIZONTAL)
    {
        innerContainerMeasure  = innerContainer->getContentSize().width;
        scrollViewMeasure      = _parent->getContentSize().width;
        outOfBoundaryValue     = outOfBoundary.x;
        innerContainerPosition = -innerContainer->getPositionX();
    }

    float length = calculateLength(innerContainerMeasure, scrollViewMeasure, outOfBoundaryValue);
    Vec2 position =
        calculatePosition(innerContainerMeasure, scrollViewMeasure, innerContainerPosition, outOfBoundaryValue, length);
    updateLength(length);
    setPosition(position);
}

float ScrollViewBar::calculateLength(float innerContainerMeasure, float scrollViewMeasure, float outOfBoundaryValue)
{