Method drawChildren

source/windowing/StarScrollArea.cpp:196–230

}

void ScrollBar::drawChildren() {
  if (m_parent) {
    auto scrollArea = convert<ScrollArea>(m_parent);

    float ratio = sizeRatio();
    if (ratio < 1)
      ratio = 1;

    int innerSize = (int)max(0.0f, ceil(trackSize() / ratio));
    int offsetBegin = (int)ceil((trackSize() - innerSize) * scrollRatio());
    innerSize += ScrollThumbOverhead;

    if (m_direction == GuiDirection::Vertical) {
      if (scrollArea->horizontalScroll()) {
        m_forward->setPosition(m_parent->size() - Vec2I(ScrollAreaBorder, ScrollButtonStackSize));
        m_backward->setPosition({m_parent->size()[0] - ScrollAreaBorder, ScrollAreaBorder});
        m_thumb->setPosition({m_parent->size()[0] - ScrollAreaBorder, ScrollAreaBorder + ScrollButtonStackSize + offsetBegin});
      } else {
        m_forward->setPosition(m_parent->size() - Vec2I(ScrollAreaBorder, ScrollButtonStackSize));
        m_backward->setPosition({m_parent->size()[0] - ScrollAreaBorder, 0});
        m_thumb->setPosition({m_parent->size()[0] - ScrollAreaBorder, ScrollButtonStackSize + offsetBegin});
      }
      m_thumb->setSize(Vec2I(m_thumb->baseSize()[0], innerSize));
    } else {
      m_forward->setPosition({m_parent->size()[0] - ScrollButtonStackSize, 0});
      m_backward->setPosition({0, 0});
      m_thumb->setPosition({ScrollButtonStackSize + offsetBegin, 0});
      m_thumb->setSize(Vec2I(innerSize, m_thumb->baseSize()[1]));
    }

    for (auto child : m_members) {
      child->render(m_drawingArea);
    }
  }
}

Vec2I ScrollBar::offsetFromThumbPosition(Vec2I const& thumbPosition) const {
  auto scrollArea = convert<ScrollArea>(m_parent);