ionic-framework/js/views/loadingView.js

(function(ionic) {
'use strict';
  /**
   * An ActionSheet is the slide up menu popularized on iOS.
   *
   * You see it all over iOS apps, where it offers a set of options 
   * triggered after an action.
   */
  ionic.views.Loading = function(opts) {
    var _this = this;

    this.el = opts.el;

    this.maxWidth = opts.maxWidth || 200;

    this._loadingBox = this.el.querySelector('.loading');
  };

  ionic.views.Loading.prototype = {
    show: function() {
      var _this = this;

      if(this._loadingBox) {
        var lb = _this._loadingBox;

        var width = Math.min(_this.maxWidth, Math.max(window.outerWidth - 40, lb.offsetWidth));

        lb.style.width = width;

        lb.style.marginLeft = (-lb.offsetWidth) / 2 + 'px';
        lb.style.marginTop = (-lb.offsetHeight) / 2 + 'px';

        _this.el.classList.add('active');
      }
    },
    hide: function() {
      // Force a reflow so the animation will actually run
      this.el.offsetWidth;

      this.el.classList.remove('active');
    }
  };

})(ionic);