om/node_modules/vuetify/lib/components/transitions/expand-transition.js

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import { upperFirst } from '../../util/helpers';
export default function () {
    var expandedParentClass = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';
    var x = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

    var sizeProperty = x ? 'width' : 'height';
    return {
        beforeEnter: function beforeEnter(el) {
            el._parent = el.parentNode;
            el._initialStyle = _defineProperty({
                transition: el.style.transition,
                visibility: el.style.visibility,
                overflow: el.style.overflow
            }, sizeProperty, el.style[sizeProperty]);
        },
        enter: function enter(el) {
            var initialStyle = el._initialStyle;
            el.style.setProperty('transition', 'none', 'important');
            el.style.visibility = 'hidden';
            var size = el['offset' + upperFirst(sizeProperty)] + 'px';
            el.style.visibility = initialStyle.visibility;
            el.style.overflow = 'hidden';
            el.style[sizeProperty] = 0;
            void el.offsetHeight; // force reflow
            el.style.transition = initialStyle.transition;
            expandedParentClass && el._parent && el._parent.classList.add(expandedParentClass);
            requestAnimationFrame(function () {
                el.style[sizeProperty] = size;
            });
        },

        afterEnter: resetStyles,
        enterCancelled: resetStyles,
        leave: function leave(el) {
            el._initialStyle = _defineProperty({
                overflow: el.style.overflow
            }, sizeProperty, el.style[sizeProperty]);
            el.style.overflow = 'hidden';
            el.style[sizeProperty] = el['offset' + upperFirst(sizeProperty)] + 'px';
            void el.offsetHeight; // force reflow
            requestAnimationFrame(function () {
                return el.style[sizeProperty] = 0;
            });
        },

        afterLeave: afterLeave,
        leaveCancelled: afterLeave
    };
    function afterLeave(el) {
        expandedParentClass && el._parent && el._parent.classList.remove(expandedParentClass);
        resetStyles(el);
    }
    function resetStyles(el) {
        el.style.overflow = el._initialStyle.overflow;
        el.style[sizeProperty] = el._initialStyle[sizeProperty];
        delete el._initialStyle;
    }
}
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