bmfe-vue2-base/src/js/baseLibs/sidebarMenu/perfectScrollbar/plugin/update.js

BM 后台系统基础框架

'use strict';

var _ = require('../lib/helper');
var dom = require('../lib/dom');
var instances = require('./instances');
var updateGeometry = require('./update-geometry');
var updateScroll = require('./update-scroll');

module.exports = function (element) {
  var i = instances.get(element);

  if (!i) {
    return;
  }

  // Recalcuate negative scrollLeft adjustment
  i.negativeScrollAdjustment = i.isNegativeScroll ? element.scrollWidth - element.clientWidth : 0;

  // Recalculate rail margins
  dom.css(i.scrollbarXRail, 'display', 'block');
  dom.css(i.scrollbarYRail, 'display', 'block');
  i.railXMarginWidth = _.toInt(dom.css(i.scrollbarXRail, 'marginLeft')) + _.toInt(dom.css(i.scrollbarXRail, 'marginRight'));
  i.railYMarginHeight = _.toInt(dom.css(i.scrollbarYRail, 'marginTop')) + _.toInt(dom.css(i.scrollbarYRail, 'marginBottom'));

  // Hide scrollbars not to affect scrollWidth and scrollHeight
  dom.css(i.scrollbarXRail, 'display', 'none');
  dom.css(i.scrollbarYRail, 'display', 'none');

  updateGeometry(element);

  // Update top/left scroll to trigger events
  updateScroll(element, 'top', element.scrollTop);
  updateScroll(element, 'left', element.scrollLeft);

  dom.css(i.scrollbarXRail, 'display', '');
  dom.css(i.scrollbarYRail, 'display', '');
};