144 lines
4.3 KiB
JavaScript
144 lines
4.3 KiB
JavaScript
/**
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* @license
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* Copyright 2015 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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(function() {
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'use strict';
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/**
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* Class constructor for Spinner MDL component.
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* Implements MDL component design pattern defined at:
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* https://github.com/jasonmayes/mdl-component-design-pattern
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*
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* @param {HTMLElement} element The element that will be upgraded.
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* @constructor
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*/
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var MaterialSpinner = function MaterialSpinner(element) {
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this.element_ = element;
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// Initialize instance.
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this.init();
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};
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window.MaterialSpinner = MaterialSpinner;
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/**
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* Store constants in one place so they can be updated easily.
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*
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* @enum {string | number}
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* @private
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*/
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MaterialSpinner.prototype.Constant_ = {
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MDL_SPINNER_LAYER_COUNT: 4
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};
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/**
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* Store strings for class names defined by this component that are used in
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* JavaScript. This allows us to simply change it in one place should we
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* decide to modify at a later date.
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*
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* @enum {string}
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* @private
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*/
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MaterialSpinner.prototype.CssClasses_ = {
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MDL_SPINNER_LAYER: 'mdl-spinner__layer',
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MDL_SPINNER_CIRCLE_CLIPPER: 'mdl-spinner__circle-clipper',
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MDL_SPINNER_CIRCLE: 'mdl-spinner__circle',
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MDL_SPINNER_GAP_PATCH: 'mdl-spinner__gap-patch',
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MDL_SPINNER_LEFT: 'mdl-spinner__left',
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MDL_SPINNER_RIGHT: 'mdl-spinner__right'
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};
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/**
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* Auxiliary method to create a spinner layer.
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*
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* @param {number} index Index of the layer to be created.
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* @public
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*/
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MaterialSpinner.prototype.createLayer = function(index) {
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var layer = document.createElement('div');
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layer.classList.add(this.CssClasses_.MDL_SPINNER_LAYER);
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layer.classList.add(this.CssClasses_.MDL_SPINNER_LAYER + '-' + index);
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var leftClipper = document.createElement('div');
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leftClipper.classList.add(this.CssClasses_.MDL_SPINNER_CIRCLE_CLIPPER);
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leftClipper.classList.add(this.CssClasses_.MDL_SPINNER_LEFT);
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var gapPatch = document.createElement('div');
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gapPatch.classList.add(this.CssClasses_.MDL_SPINNER_GAP_PATCH);
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var rightClipper = document.createElement('div');
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rightClipper.classList.add(this.CssClasses_.MDL_SPINNER_CIRCLE_CLIPPER);
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rightClipper.classList.add(this.CssClasses_.MDL_SPINNER_RIGHT);
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var circleOwners = [leftClipper, gapPatch, rightClipper];
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for (var i = 0; i < circleOwners.length; i++) {
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var circle = document.createElement('div');
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circle.classList.add(this.CssClasses_.MDL_SPINNER_CIRCLE);
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circleOwners[i].appendChild(circle);
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}
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layer.appendChild(leftClipper);
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layer.appendChild(gapPatch);
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layer.appendChild(rightClipper);
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this.element_.appendChild(layer);
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};
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/**
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* Stops the spinner animation.
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* Public method for users who need to stop the spinner for any reason.
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*
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* @public
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*/
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MaterialSpinner.prototype.stop = function() {
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this.element_.classList.remove('is-active');
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};
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/**
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* Starts the spinner animation.
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* Public method for users who need to manually start the spinner for any reason
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* (instead of just adding the 'is-active' class to their markup).
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*
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* @public
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*/
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MaterialSpinner.prototype.start = function() {
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this.element_.classList.add('is-active');
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};
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/**
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* Initialize element.
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*/
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MaterialSpinner.prototype.init = function() {
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if (this.element_) {
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for (var i = 1; i <= this.Constant_.MDL_SPINNER_LAYER_COUNT; i++) {
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this.createLayer(i);
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}
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this.element_.classList.add('is-upgraded');
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}
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};
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// The component registers itself. It can assume componentHandler is available
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// in the global scope.
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componentHandler.register({
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constructor: MaterialSpinner,
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classAsString: 'MaterialSpinner',
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cssClass: 'mdl-js-spinner',
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widget: true
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});
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})();
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