'use strict';

exports.__esModule = true;

var _dom = require('element-ui/lib/utils/dom');

function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
        throw new TypeError("Cannot call a class as a function");
    }
}

var Transition = function () {
    function Transition() {
        _classCallCheck(this, Transition);
    }

    Transition.prototype.beforeEnter = function beforeEnter(el) {
        (0, _dom.addClass)(el, 'collapse-transition');
        if (!el.dataset) el.dataset = {};

        el.dataset.oldPaddingTop = el.style.paddingTop;
        el.dataset.oldPaddingBottom = el.style.paddingBottom;

        el.style.height = '0';
        el.style.paddingTop = 0;
        el.style.paddingBottom = 0;
    };

    Transition.prototype.enter = function enter(el) {
        el.dataset.oldOverflow = el.style.overflow;
        if (el.scrollHeight !== 0) {
            el.style.height = el.scrollHeight + 'px';
            el.style.paddingTop = el.dataset.oldPaddingTop;
            el.style.paddingBottom = el.dataset.oldPaddingBottom;
        } else {
            el.style.height = '';
            el.style.paddingTop = el.dataset.oldPaddingTop;
            el.style.paddingBottom = el.dataset.oldPaddingBottom;
        }

        el.style.overflow = 'hidden';
    };

    Transition.prototype.afterEnter = function afterEnter(el) {
        // for safari: remove class then reset height is necessary
        (0, _dom.removeClass)(el, 'collapse-transition');
        el.style.height = '';
        el.style.overflow = el.dataset.oldOverflow;
    };

    Transition.prototype.beforeLeave = function beforeLeave(el) {
        if (!el.dataset) el.dataset = {};
        el.dataset.oldPaddingTop = el.style.paddingTop;
        el.dataset.oldPaddingBottom = el.style.paddingBottom;
        el.dataset.oldOverflow = el.style.overflow;

        el.style.height = el.scrollHeight + 'px';
        el.style.overflow = 'hidden';
    };

    Transition.prototype.leave = function leave(el) {
        if (el.scrollHeight !== 0) {
            // for safari: add class after set height, or it will jump to zero height suddenly, weired
            (0, _dom.addClass)(el, 'collapse-transition');
            el.style.height = 0;
            el.style.paddingTop = 0;
            el.style.paddingBottom = 0;
        }
    };

    Transition.prototype.afterLeave = function afterLeave(el) {
        (0, _dom.removeClass)(el, 'collapse-transition');
        el.style.height = '';
        el.style.overflow = el.dataset.oldOverflow;
        el.style.paddingTop = el.dataset.oldPaddingTop;
        el.style.paddingBottom = el.dataset.oldPaddingBottom;
    };

    return Transition;
}();

exports.default = {
    name: 'ElCollapseTransition',
    functional: true,
    render: function render(h, _ref) {
        var children = _ref.children;

        var data = {
            on: new Transition()
        };

        return h('transition', data, children);
    }
};