Method findNearestChildWidgetIndex

core/ui/UILayout.cpp:1161–1206

}

int Layout::findNearestChildWidgetIndex(FocusDirection direction, Widget* baseWidget)
{
    if (baseWidget == nullptr || baseWidget == this)
    {
        return this->findFirstFocusEnabledWidgetIndex();
    }
    int index     = 0;
    ssize_t count = this->getChildren().size();

    float distance = FLT_MAX;
    int found      = 0;
    if (direction == FocusDirection::LEFT || direction == FocusDirection::RIGHT || direction == FocusDirection::DOWN ||
        direction == FocusDirection::UP)
    {
        Vec2 widgetPosition = this->getWorldCenterPoint(baseWidget);
        while (index < count)
        {
            Widget* w = dynamic_cast<Widget*>(this->getChildren().at(index));
            if (w && w->isFocusEnabled())
            {
                Vec2 wPosition = this->getWorldCenterPoint(w);
                float length;
                Layout* layout = dynamic_cast<Layout*>(w);
                if (layout)
                {
                    length = layout->calculateNearestDistance(baseWidget);
                }
                else
                {
                    length = (wPosition - widgetPosition).getLength();
                }

                if (length < distance)
                {
                    found    = index;
                    distance = length;
                }
            }
            index++;
        }
        return found;
    }

    AXASSERT(0, "invalid focus direction!!!");
    return 0;
}

int Layout::findFarthestChildWidgetIndex(FocusDirection direction, ax::ui::Widget* baseWidget)
{