Function WidgetVScrollbarDraw

src/openrct2-ui/interface/Widget.cpp:818–855

    }

    static void WidgetVScrollbarDraw(
        RenderTarget& rt, const ScrollArea& scroll, int32_t l, int32_t t, int32_t r, int32_t b, ColourWithFlags colour)
    {
        colour.flags.set(ColourFlag::translucent, false);

        // Trough
        Rectangle::fill(rt, { { l, t + kScrollBarWidth }, { r, b - kScrollBarWidth } }, getColourMap(colour.colour).lighter);
        Rectangle::fill(
            rt, { { l, t + kScrollBarWidth }, { r, b - kScrollBarWidth } }, getColourMap(colour.colour).midDark, true);
        Rectangle::fill(
            rt, { { l + 2, t + kScrollBarWidth }, { l + 2, b - kScrollBarWidth } }, getColourMap(colour.colour).midDark);
        Rectangle::fill(
            rt, { { l + 3, t + kScrollBarWidth }, { l + 3, b - kScrollBarWidth } }, getColourMap(colour.colour).lighter);
        Rectangle::fill(
            rt, { { l + 7, t + kScrollBarWidth }, { l + 7, b - kScrollBarWidth } }, getColourMap(colour.colour).midDark);
        Rectangle::fill(
            rt, { { l + 8, t + kScrollBarWidth }, { l + 8, b - kScrollBarWidth } }, getColourMap(colour.colour).lighter);

        // Up button
        Rectangle::fillInset(
            rt, { { l, t }, { r, t + (kScrollBarWidth - 1) } }, colour,
            ((scroll.flags & VSCROLLBAR_UP_PRESSED) ? Rectangle::BorderStyle::inset : Rectangle::BorderStyle::outset));
        drawText(rt, { l + 1, t - 1 }, kBlackUpArrowString);

        // Thumb
        Rectangle::fillInset(
            rt,
            { { l, std::max(t + kScrollBarWidth, t + scroll.vThumbTop - 1) },
              { r, std::min(b - kScrollBarWidth, t + scroll.vThumbBottom - 1) } },
            { colour },
            ((scroll.flags & VSCROLLBAR_THUMB_PRESSED) ? Rectangle::BorderStyle::inset : Rectangle::BorderStyle::outset));

        // Down button
        Rectangle::fillInset(
            rt, { { l, b - (kScrollBarWidth - 1) }, { r, b } }, colour,
            ((scroll.flags & VSCROLLBAR_DOWN_PRESSED) ? Rectangle::BorderStyle::inset : Rectangle::BorderStyle::outset));
        drawText(rt, { l + 1, b - (kScrollBarWidth - 1) }, kBlackDownArrowString);
    }

    /**
     *