Function scrollHandler

src/components/legend/draw.js:440–452

(scrollBoxY, scrollBarHeight, scrollRatio)

            }

            function scrollHandler(scrollBoxY, scrollBarHeight, scrollRatio) {
                legendObj._scrollY = gd._fullLayout[legendId]._scrollY = scrollBoxY;
                Drawing.setTranslate(scrollBox, 0, -scrollBoxY);

                Drawing.setRect(
                    scrollBar,
                    legendObj._width,
                    constants.scrollBarMargin + scrollBoxY * scrollRatio,
                    constants.scrollBarWidth,
                    scrollBarHeight
                );
                clipPath.select('rect').attr('y', bw + scrollBoxY);
            }

            if(gd._context.edits.legendPosition) {
                var xf, yf, x0, y0;