shell.js

(function setupShellCSS(){
    document.querySelectorAll(".collapse").forEach(function (elem) {
        elem.addEventListener("click", function (event) {
            console.info("clicked");
            var collapsable = document.getElementById(this.dataset.target);
            if (collapsable.dataset.collapsed == "true") {
                console.info("uncollapsing");
                uncollapse(collapsable);
            }
            else {
                console.info("collapsing");
                collapse(collapsable);
            }
        });
        document.getElementById("side-nav").addEventListener("touchstart", function (event) {
            console.info("Swiping.");
            this.touchStart = (event.touches[0].pageX);
        });
        document.getElementById("side-nav").addEventListener("touchend", function (event) {
            var moved = this.touchStart - event.changedTouches[0].pageX;
            var collapsable = this;
            console.info(moved);
            if (moved < 0) { //swipe left to right
                console.info("L -> R");
                console.info("uncollapsing");
                uncollapse(collapsable);
            }
            else if (moved > 0) { //swipe right to left
                console.info("L <- R");
                console.info("collapsing");
                collapse(collapsable);
            }
        });
    });

    function collapse(elem) {
        elem.dataset.originalWidth = elem.getBoundingClientRect().width;
        elem.style.width = '0px';
        elem.style.minWidth = '0px';
        elem.dataset.collapsed = "true";
    }

    function uncollapse(elem) {
        elem.style.width = `${elem.dataset.originalWidth}px`;
        elem.style.minWidth = `${elem.dataset.originalWidth}px`;
        elem.dataset.collapsed = "false";
    }
})();