Method onTouchBegan

extensions/GUI/src/GUI/ScrollView/ScrollView.cpp:701–740

}

bool ScrollView::onTouchBegan(Touch* touch, Event* /*event*/)
{
    if (!this->isVisible() || !this->hasVisibleParents())
    {
        return false;
    }

    Rect frame = getViewRect();

    // dispatcher does not know about clipping. reject touches outside visible bounds.
    if (_touches.size() > 2 || _touchMoved || !frame.containsPoint(touch->getLocation()))
    {
        return false;
    }

    if (std::find(_touches.begin(), _touches.end(), touch) == _touches.end())
    {
        _touches.emplace_back(touch);
    }

    if (_touches.size() == 1)
    {  // scrolling
        _touchPoint = this->convertTouchToNodeSpace(touch);
        _touchMoved = false;
        _dragging   = true;  // dragging started
        _scrollDistance.setZero();
        _touchLength = 0.0f;
    }
    else if (_touches.size() == 2)
    {
        _touchPoint =
            (this->convertTouchToNodeSpace(_touches[0]).getMidpoint(this->convertTouchToNodeSpace(_touches[1])));

        _touchLength = _container->convertTouchToNodeSpace(_touches[0])
                           .getDistance(_container->convertTouchToNodeSpace(_touches[1]));

        _dragging = false;
    }
    return true;
}

void ScrollView::onTouchMoved(Touch* touch, Event* /*event*/)
{