Method scrollChildren

core/ui/UIScrollView.cpp:666–742

}

void ScrollView::scrollChildren(const Vec2& deltaMove)
{
    Vec2 realMove = deltaMove;
    if (_bounceEnabled)
    {
        // If the position of the inner container is out of the boundary, the offsets should be divided by two.
        Vec2 outOfBoundary = getHowMuchOutOfBoundary();
        realMove.x *= (outOfBoundary.x == 0 ? 1 : 0.5f);
        realMove.y *= (outOfBoundary.y == 0 ? 1 : 0.5f);
    }

    if (!_bounceEnabled)
    {
        Vec2 outOfBoundary = getHowMuchOutOfBoundary(realMove);
        realMove += outOfBoundary;
    }

    bool scrolledToLeft   = false;
    bool scrolledToRight  = false;
    bool scrolledToTop    = false;
    bool scrolledToBottom = false;
    if (realMove.y > 0.0f)  // up
    {
        float icBottomPos = _innerContainer->getBottomBoundary();
        if (icBottomPos + realMove.y >= _bottomBoundary)
        {
            scrolledToBottom = true;
        }
    }
    else if (realMove.y < 0.0f)  // down
    {
        float icTopPos = _innerContainer->getTopBoundary();
        if (icTopPos + realMove.y <= _topBoundary)
        {
            scrolledToTop = true;
        }
    }

    if (realMove.x < 0.0f)  // left
    {
        float icRightPos = _innerContainer->getRightBoundary();
        if (icRightPos + realMove.x <= _rightBoundary)
        {
            scrolledToRight = true;
        }
    }
    else if (realMove.x > 0.0f)  // right
    {
        float icLeftPos = _innerContainer->getLeftBoundary();
        if (icLeftPos + realMove.x >= _leftBoundary)
        {
            scrolledToLeft = true;
        }
    }
    moveInnerContainer(realMove, false);

    if (realMove.x != 0 || realMove.y != 0)
    {