smooth-scrollbar/geometry/update.js

Customize scrollbar in modern browsers with smooth scrolling experience.

export function update(scrollbar) {
    var newSize = scrollbar.getSize();
    var limit = {
        x: Math.max(newSize.content.width - newSize.container.width, 0),
        y: Math.max(newSize.content.height - newSize.container.height, 0),
    };
    // metrics
    var containerBounding = scrollbar.containerEl.getBoundingClientRect();
    var bounding = {
        top: Math.max(containerBounding.top, 0),
        right: Math.min(containerBounding.right, window.innerWidth),
        bottom: Math.min(containerBounding.bottom, window.innerHeight),
        left: Math.max(containerBounding.left, 0),
    };
    // assign props
    scrollbar.size = newSize;
    scrollbar.limit = limit;
    scrollbar.bounding = bounding;
    // update tracks
    scrollbar.track.update();
    // re-positioning
    scrollbar.setPosition();
}
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