[native] 获取元素的 tranlsate

[Jogiter]

swiper/utils

// copy from https://github.com/nolimits4web/swiper/blob/master/src/utils/utils.js#L25-L62
function getTranslate(el) {
    var axis = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'x';

    var matrix = void 0;
    var curTransform = void 0;
    var transformMatrix = void 0;

    var curStyle = window.getComputedStyle(el, null);

    if (window.WebKitCSSMatrix) {
        curTransform = curStyle.transform || curStyle.webkitTransform;
        if (curTransform.split(',').length > 6) {
            curTransform = curTransform.split(', ').map(function(a) {
                return a.replace(',', '.');
            }).join(', ');
        }
        // Some old versions of Webkit choke when 'none' is passed; pass
        // empty string instead in this case
        transformMatrix = new window.WebKitCSSMatrix(curTransform === 'none' ? '' : curTransform);
    } else {
        transformMatrix = curStyle.MozTransform || curStyle.OTransform || curStyle.MsTransform || curStyle.msTransform || curStyle.transform || curStyle.getPropertyValue('transform').replace('translate(', 'matrix(1, 0, 0, 1,');
        matrix = transformMatrix.toString().split(',');
    }

    if (axis === 'x') {
        // Latest Chrome and webkits Fix
        if (window.WebKitCSSMatrix) curTransform = transformMatrix.m41;
        // Crazy IE10 Matrix
        else if (matrix.length === 16) curTransform = parseFloat(matrix[12]);
        // Normal Browsers
        else curTransform = parseFloat(matrix[4]);
    }
    if (axis === 'y') {
        // Latest Chrome and webkits Fix
        if (window.WebKitCSSMatrix) curTransform = transformMatrix.m42;
        // Crazy IE10 Matrix
        else if (matrix.length === 16) curTransform = parseFloat(matrix[13]);
        // Normal Browsers
        else curTransform = parseFloat(matrix[5]);
    }
    return curTransform || 0;
}