svelte-awesome-color-picker/dist/utils/trapFocus.js

A highly customizable color picker component library

// list taken from https://github.com/nico3333fr/van11y-accessible-modal-tooltip-aria/blob/1a83366c65358222483be849fbb768c31cefaf4d/src/van11y-accessible-modal-tooltip-aria.es6.js#L47
export const FOCUSABLE_ELEMENTS = "a[href], area[href], input:not([type='hidden']):not([disabled]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, *[tabindex], *[contenteditable]";
// code adapted from https://gist.github.com/JulienPradet/20dbb7ca06cbd9e2ec499bb2206aab55#file-trapfocus-ts-L1-L44
function trapFocusListener(trapFocusElement) {
    return function (event) {
        if (event.target === window) {
            return;
        }
        const eventTarget = event.target;
        if (!trapFocusElement.contains(eventTarget)) {
            return;
        }
        const focusable = trapFocusElement.querySelectorAll(FOCUSABLE_ELEMENTS);
        const first = focusable[0];
        const last = focusable[focusable.length - 1];
        function isNext(event) {
            return event.code === 'Tab' && !event.shiftKey;
        }
        function isPrevious(event) {
            return event.code === 'Tab' && event.shiftKey;
        }
        if (isNext(event) && event.target === last) {
            event.preventDefault();
            first.focus();
        }
        else if (isPrevious(event) && event.target === first) {
            event.preventDefault();
            last.focus();
        }
    };
}
export const trapFocus = (node) => {
    const first = node.querySelector(FOCUSABLE_ELEMENTS);
    if (first)
        first.focus();
    const listener = trapFocusListener(node);
    document.addEventListener('keydown', listener);
    return {
        destroy() {
            document.removeEventListener('keydown', listener);
        }
    };
};