Function getPart

src/OpenLoco/src/Ui/ScrollView.cpp:167–290

0x004C8EF0 Note: Original function returns a scrollAreaOffset not an index

    // 0x004C8EF0
    // Note: Original function returns a scrollAreaOffset not an index
    GetPartResult getPart(Ui::Window& window, Ui::Widget* widget, int16_t x, int16_t y)
    {
        GetPartResult res{ { x, y }, ScrollPart::none, 0 };

        for (auto& widget2 : window.widgets)
        {
            if (widget == &widget2)
            {
                break;
            }
            if (widget2.type == WidgetType::scrollview)
            {
                res.index++;
            }
        }

        res.index = std::min<size_t>(res.index, Window::kMaxScrollAreas - 1);

        const auto& scroll = window.scrollAreas[res.index];
        auto right = widget->right + window.x;
        auto left = widget->left + window.x;
        auto top = widget->top + window.y;
        auto bottom = widget->bottom + window.y;

        const bool needsHScroll = scroll.contentWidth > widget->width();
        const bool needsVScroll = scroll.contentHeight > widget->height();

        if (needsHScroll && scroll.hasFlags(ScrollFlags::hscrollbarVisible) && y >= (bottom - kScrollbarSize))
        {
            if (x < left + kScrollbarSize)
            {
                res.area = ScrollPart::hscrollbarButtonLeft;
                return res;
            }

            // If vertical is also visible then there is a deadzone in the corner
            if (scroll.hasFlags(ScrollFlags::vscrollbarVisible))
            {
                right -= kScrollbarSize;
            }

            // Within deadzone
            if (x >= right)
            {
                res.area = ScrollPart::none;
                return res;
            }

            if (x >= right - kThumbSize)
            {
                res.area = ScrollPart::hscrollbarButtonRight;
                return res;
            }

            if (x < scroll.hThumbLeft + left)
            {
                res.area = ScrollPart::hscrollbarTrackLeft;
                return res;