Project import generated by Copybara.
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+/**
+ * @license
+ * Copyright 2015 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+(function() {
+ 'use strict';
+
+ /**
+ * Class constructor for dropdown MDL component.
+ * Implements MDL component design pattern defined at:
+ * https://github.com/jasonmayes/mdl-component-design-pattern
+ *
+ * @constructor
+ * @param {HTMLElement} element The element that will be upgraded.
+ */
+ var MaterialMenu = function MaterialMenu(element) {
+ this.element_ = element;
+
+ // Initialize instance.
+ this.init();
+ };
+ window['MaterialMenu'] = MaterialMenu;
+
+ /**
+ * Store constants in one place so they can be updated easily.
+ *
+ * @enum {string | number}
+ * @private
+ */
+ MaterialMenu.prototype.Constant_ = {
+ // Total duration of the menu animation.
+ TRANSITION_DURATION_SECONDS: 0.3,
+ // The fraction of the total duration we want to use for menu item animations.
+ TRANSITION_DURATION_FRACTION: 0.8,
+ // How long the menu stays open after choosing an option (so the user can see
+ // the ripple).
+ CLOSE_TIMEOUT: 150
+ };
+
+ /**
+ * Keycodes, for code readability.
+ *
+ * @enum {number}
+ * @private
+ */
+ MaterialMenu.prototype.Keycodes_ = {
+ ENTER: 13,
+ ESCAPE: 27,
+ SPACE: 32,
+ UP_ARROW: 38,
+ DOWN_ARROW: 40
+ };
+
+ /**
+ * Store strings for class names defined by this component that are used in
+ * JavaScript. This allows us to simply change it in one place should we
+ * decide to modify at a later date.
+ *
+ * @enum {string}
+ * @private
+ */
+ MaterialMenu.prototype.CssClasses_ = {
+ CONTAINER: 'mdl-menu__container',
+ OUTLINE: 'mdl-menu__outline',
+ ITEM: 'mdl-menu__item',
+ ITEM_RIPPLE_CONTAINER: 'mdl-menu__item-ripple-container',
+ RIPPLE_EFFECT: 'mdl-js-ripple-effect',
+ RIPPLE_IGNORE_EVENTS: 'mdl-js-ripple-effect--ignore-events',
+ RIPPLE: 'mdl-ripple',
+ // Statuses
+ IS_UPGRADED: 'is-upgraded',
+ IS_VISIBLE: 'is-visible',
+ IS_ANIMATING: 'is-animating',
+ // Alignment options
+ BOTTOM_LEFT: 'mdl-menu--bottom-left', // This is the default.
+ BOTTOM_RIGHT: 'mdl-menu--bottom-right',
+ TOP_LEFT: 'mdl-menu--top-left',
+ TOP_RIGHT: 'mdl-menu--top-right',
+ UNALIGNED: 'mdl-menu--unaligned'
+ };
+
+ /**
+ * Initialize element.
+ */
+ MaterialMenu.prototype.init = function() {
+ if (this.element_) {
+ // Create container for the menu.
+ var container = document.createElement('div');
+ container.classList.add(this.CssClasses_.CONTAINER);
+ this.element_.parentElement.insertBefore(container, this.element_);
+ this.element_.parentElement.removeChild(this.element_);
+ container.appendChild(this.element_);
+ this.container_ = container;
+
+ // Create outline for the menu (shadow and background).
+ var outline = document.createElement('div');
+ outline.classList.add(this.CssClasses_.OUTLINE);
+ this.outline_ = outline;
+ container.insertBefore(outline, this.element_);
+
+ // Find the "for" element and bind events to it.
+ var forElId = this.element_.getAttribute('for') ||
+ this.element_.getAttribute('data-mdl-for');
+ var forEl = null;
+ if (forElId) {
+ forEl = document.getElementById(forElId);
+ if (forEl) {
+ this.forElement_ = forEl;
+ forEl.addEventListener('click', this.handleForClick_.bind(this));
+ forEl.addEventListener('keydown',
+ this.handleForKeyboardEvent_.bind(this));
+ }
+ }
+
+ var items = this.element_.querySelectorAll('.' + this.CssClasses_.ITEM);
+ this.boundItemKeydown_ = this.handleItemKeyboardEvent_.bind(this);
+ this.boundItemClick_ = this.handleItemClick_.bind(this);
+ for (var i = 0; i < items.length; i++) {
+ // Add a listener to each menu item.
+ items[i].addEventListener('click', this.boundItemClick_);
+ // Add a tab index to each menu item.
+ items[i].tabIndex = '-1';
+ // Add a keyboard listener to each menu item.
+ items[i].addEventListener('keydown', this.boundItemKeydown_);
+ }
+
+ // Add ripple classes to each item, if the user has enabled ripples.
+ if (this.element_.classList.contains(this.CssClasses_.RIPPLE_EFFECT)) {
+ this.element_.classList.add(this.CssClasses_.RIPPLE_IGNORE_EVENTS);
+
+ for (i = 0; i < items.length; i++) {
+ var item = items[i];
+
+ var rippleContainer = document.createElement('span');
+ rippleContainer.classList.add(this.CssClasses_.ITEM_RIPPLE_CONTAINER);
+
+ var ripple = document.createElement('span');
+ ripple.classList.add(this.CssClasses_.RIPPLE);
+ rippleContainer.appendChild(ripple);
+
+ item.appendChild(rippleContainer);
+ item.classList.add(this.CssClasses_.RIPPLE_EFFECT);
+ }
+ }
+
+ // Copy alignment classes to the container, so the outline can use them.
+ if (this.element_.classList.contains(this.CssClasses_.BOTTOM_LEFT)) {
+ this.outline_.classList.add(this.CssClasses_.BOTTOM_LEFT);
+ }
+ if (this.element_.classList.contains(this.CssClasses_.BOTTOM_RIGHT)) {
+ this.outline_.classList.add(this.CssClasses_.BOTTOM_RIGHT);
+ }
+ if (this.element_.classList.contains(this.CssClasses_.TOP_LEFT)) {
+ this.outline_.classList.add(this.CssClasses_.TOP_LEFT);
+ }
+ if (this.element_.classList.contains(this.CssClasses_.TOP_RIGHT)) {
+ this.outline_.classList.add(this.CssClasses_.TOP_RIGHT);
+ }
+ if (this.element_.classList.contains(this.CssClasses_.UNALIGNED)) {
+ this.outline_.classList.add(this.CssClasses_.UNALIGNED);
+ }
+
+ container.classList.add(this.CssClasses_.IS_UPGRADED);
+ }
+ };
+
+ /**
+ * Handles a click on the "for" element, by positioning the menu and then
+ * toggling it.
+ *
+ * @param {Event} evt The event that fired.
+ * @private
+ */
+ MaterialMenu.prototype.handleForClick_ = function(evt) {
+ if (this.element_ && this.forElement_) {
+ var rect = this.forElement_.getBoundingClientRect();
+ var forRect = this.forElement_.parentElement.getBoundingClientRect();
+
+ if (this.element_.classList.contains(this.CssClasses_.UNALIGNED)) {
+ // Do not position the menu automatically. Requires the developer to
+ // manually specify position.
+ } else if (this.element_.classList.contains(
+ this.CssClasses_.BOTTOM_RIGHT)) {
+ // Position below the "for" element, aligned to its right.
+ this.container_.style.right = (forRect.right - rect.right) + 'px';
+ this.container_.style.top =
+ this.forElement_.offsetTop + this.forElement_.offsetHeight + 'px';
+ } else if (this.element_.classList.contains(this.CssClasses_.TOP_LEFT)) {
+ // Position above the "for" element, aligned to its left.
+ this.container_.style.left = this.forElement_.offsetLeft + 'px';
+ this.container_.style.bottom = (forRect.bottom - rect.top) + 'px';
+ } else if (this.element_.classList.contains(this.CssClasses_.TOP_RIGHT)) {
+ // Position above the "for" element, aligned to its right.
+ this.container_.style.right = (forRect.right - rect.right) + 'px';
+ this.container_.style.bottom = (forRect.bottom - rect.top) + 'px';
+ } else {
+ // Default: position below the "for" element, aligned to its left.
+ this.container_.style.left = this.forElement_.offsetLeft + 'px';
+ this.container_.style.top =
+ this.forElement_.offsetTop + this.forElement_.offsetHeight + 'px';
+ }
+ }
+
+ this.toggle(evt);
+ };
+
+ /**
+ * Handles a keyboard event on the "for" element.
+ *
+ * @param {Event} evt The event that fired.
+ * @private
+ */
+ MaterialMenu.prototype.handleForKeyboardEvent_ = function(evt) {
+ if (this.element_ && this.container_ && this.forElement_) {
+ var items = this.element_.querySelectorAll('.' + this.CssClasses_.ITEM +
+ ':not([disabled])');
+
+ if (items && items.length > 0 &&
+ this.container_.classList.contains(this.CssClasses_.IS_VISIBLE)) {
+ if (evt.keyCode === this.Keycodes_.UP_ARROW) {
+ evt.preventDefault();
+ items[items.length - 1].focus();
+ } else if (evt.keyCode === this.Keycodes_.DOWN_ARROW) {
+ evt.preventDefault();
+ items[0].focus();
+ }
+ }
+ }
+ };
+
+ /**
+ * Handles a keyboard event on an item.
+ *
+ * @param {Event} evt The event that fired.
+ * @private
+ */
+ MaterialMenu.prototype.handleItemKeyboardEvent_ = function(evt) {
+ if (this.element_ && this.container_) {
+ var items = this.element_.querySelectorAll('.' + this.CssClasses_.ITEM +
+ ':not([disabled])');
+
+ if (items && items.length > 0 &&
+ this.container_.classList.contains(this.CssClasses_.IS_VISIBLE)) {
+ var currentIndex = Array.prototype.slice.call(items).indexOf(evt.target);
+
+ if (evt.keyCode === this.Keycodes_.UP_ARROW) {
+ evt.preventDefault();
+ if (currentIndex > 0) {
+ items[currentIndex - 1].focus();
+ } else {
+ items[items.length - 1].focus();
+ }
+ } else if (evt.keyCode === this.Keycodes_.DOWN_ARROW) {
+ evt.preventDefault();
+ if (items.length > currentIndex + 1) {
+ items[currentIndex + 1].focus();
+ } else {
+ items[0].focus();
+ }
+ } else if (evt.keyCode === this.Keycodes_.SPACE ||
+ evt.keyCode === this.Keycodes_.ENTER) {
+ evt.preventDefault();
+ // Send mousedown and mouseup to trigger ripple.
+ var e = new MouseEvent('mousedown');
+ evt.target.dispatchEvent(e);
+ e = new MouseEvent('mouseup');
+ evt.target.dispatchEvent(e);
+ // Send click.
+ evt.target.click();
+ } else if (evt.keyCode === this.Keycodes_.ESCAPE) {
+ evt.preventDefault();
+ this.hide();
+ }
+ }
+ }
+ };
+
+ /**
+ * Handles a click event on an item.
+ *
+ * @param {Event} evt The event that fired.
+ * @private
+ */
+ MaterialMenu.prototype.handleItemClick_ = function(evt) {
+ if (evt.target.hasAttribute('disabled')) {
+ evt.stopPropagation();
+ } else {
+ // Wait some time before closing menu, so the user can see the ripple.
+ this.closing_ = true;
+ window.setTimeout(function(evt) {
+ this.hide();
+ this.closing_ = false;
+ }.bind(this), /** @type {number} */ (this.Constant_.CLOSE_TIMEOUT));
+ }
+ };
+
+ /**
+ * Calculates the initial clip (for opening the menu) or final clip (for closing
+ * it), and applies it. This allows us to animate from or to the correct point,
+ * that is, the point it's aligned to in the "for" element.
+ *
+ * @param {number} height Height of the clip rectangle
+ * @param {number} width Width of the clip rectangle
+ * @private
+ */
+ MaterialMenu.prototype.applyClip_ = function(height, width) {
+ if (this.element_.classList.contains(this.CssClasses_.UNALIGNED)) {
+ // Do not clip.
+ this.element_.style.clip = '';
+ } else if (this.element_.classList.contains(this.CssClasses_.BOTTOM_RIGHT)) {
+ // Clip to the top right corner of the menu.
+ this.element_.style.clip =
+ 'rect(0 ' + width + 'px ' + '0 ' + width + 'px)';
+ } else if (this.element_.classList.contains(this.CssClasses_.TOP_LEFT)) {
+ // Clip to the bottom left corner of the menu.
+ this.element_.style.clip =
+ 'rect(' + height + 'px 0 ' + height + 'px 0)';
+ } else if (this.element_.classList.contains(this.CssClasses_.TOP_RIGHT)) {
+ // Clip to the bottom right corner of the menu.
+ this.element_.style.clip = 'rect(' + height + 'px ' + width + 'px ' +
+ height + 'px ' + width + 'px)';
+ } else {
+ // Default: do not clip (same as clipping to the top left corner).
+ this.element_.style.clip = '';
+ }
+ };
+
+ /**
+ * Cleanup function to remove animation listeners.
+ *
+ * @param {Event} evt
+ * @private
+ */
+
+ MaterialMenu.prototype.removeAnimationEndListener_ = function(evt) {
+ evt.target.classList.remove(MaterialMenu.prototype.CssClasses_.IS_ANIMATING);
+ };
+
+ /**
+ * Adds an event listener to clean up after the animation ends.
+ *
+ * @private
+ */
+ MaterialMenu.prototype.addAnimationEndListener_ = function() {
+ this.element_.addEventListener('transitionend', this.removeAnimationEndListener_);
+ this.element_.addEventListener('webkitTransitionEnd', this.removeAnimationEndListener_);
+ };
+
+ /**
+ * Displays the menu.
+ *
+ * @public
+ */
+ MaterialMenu.prototype.show = function(evt) {
+ if (this.element_ && this.container_ && this.outline_) {
+ // Measure the inner element.
+ var height = this.element_.getBoundingClientRect().height;
+ var width = this.element_.getBoundingClientRect().width;
+
+ // Apply the inner element's size to the container and outline.
+ this.container_.style.width = width + 'px';
+ this.container_.style.height = height + 'px';
+ this.outline_.style.width = width + 'px';
+ this.outline_.style.height = height + 'px';
+
+ var transitionDuration = this.Constant_.TRANSITION_DURATION_SECONDS *
+ this.Constant_.TRANSITION_DURATION_FRACTION;
+
+ // Calculate transition delays for individual menu items, so that they fade
+ // in one at a time.
+ var items = this.element_.querySelectorAll('.' + this.CssClasses_.ITEM);
+ for (var i = 0; i < items.length; i++) {
+ var itemDelay = null;
+ if (this.element_.classList.contains(this.CssClasses_.TOP_LEFT) ||
+ this.element_.classList.contains(this.CssClasses_.TOP_RIGHT)) {
+ itemDelay = ((height - items[i].offsetTop - items[i].offsetHeight) /
+ height * transitionDuration) + 's';
+ } else {
+ itemDelay = (items[i].offsetTop / height * transitionDuration) + 's';
+ }
+ items[i].style.transitionDelay = itemDelay;
+ }
+
+ // Apply the initial clip to the text before we start animating.
+ this.applyClip_(height, width);
+
+ // Wait for the next frame, turn on animation, and apply the final clip.
+ // Also make it visible. This triggers the transitions.
+ window.requestAnimationFrame(function() {
+ this.element_.classList.add(this.CssClasses_.IS_ANIMATING);
+ this.element_.style.clip = 'rect(0 ' + width + 'px ' + height + 'px 0)';
+ this.container_.classList.add(this.CssClasses_.IS_VISIBLE);
+ }.bind(this));
+
+ // Clean up after the animation is complete.
+ this.addAnimationEndListener_();
+
+ // Add a click listener to the document, to close the menu.
+ var callback = function(e) {
+ // Check to see if the document is processing the same event that
+ // displayed the menu in the first place. If so, do nothing.
+ // Also check to see if the menu is in the process of closing itself, and
+ // do nothing in that case.
+ // Also check if the clicked element is a menu item
+ // if so, do nothing.
+ if (e !== evt && !this.closing_ && e.target.parentNode !== this.element_) {
+ document.removeEventListener('click', callback);
+ this.hide();
+ }
+ }.bind(this);
+ document.addEventListener('click', callback);
+ }
+ };
+ MaterialMenu.prototype['show'] = MaterialMenu.prototype.show;
+
+ /**
+ * Hides the menu.
+ *
+ * @public
+ */
+ MaterialMenu.prototype.hide = function() {
+ if (this.element_ && this.container_ && this.outline_) {
+ var items = this.element_.querySelectorAll('.' + this.CssClasses_.ITEM);
+
+ // Remove all transition delays; menu items fade out concurrently.
+ for (var i = 0; i < items.length; i++) {
+ items[i].style.removeProperty('transition-delay');
+ }
+
+ // Measure the inner element.
+ var rect = this.element_.getBoundingClientRect();
+ var height = rect.height;
+ var width = rect.width;
+
+ // Turn on animation, and apply the final clip. Also make invisible.
+ // This triggers the transitions.
+ this.element_.classList.add(this.CssClasses_.IS_ANIMATING);
+ this.applyClip_(height, width);
+ this.container_.classList.remove(this.CssClasses_.IS_VISIBLE);
+
+ // Clean up after the animation is complete.
+ this.addAnimationEndListener_();
+ }
+ };
+ MaterialMenu.prototype['hide'] = MaterialMenu.prototype.hide;
+
+ /**
+ * Displays or hides the menu, depending on current state.
+ *
+ * @public
+ */
+ MaterialMenu.prototype.toggle = function(evt) {
+ if (this.container_.classList.contains(this.CssClasses_.IS_VISIBLE)) {
+ this.hide();
+ } else {
+ this.show(evt);
+ }
+ };
+ MaterialMenu.prototype['toggle'] = MaterialMenu.prototype.toggle;
+
+ // The component registers itself. It can assume componentHandler is available
+ // in the global scope.
+ componentHandler.register({
+ constructor: MaterialMenu,
+ classAsString: 'MaterialMenu',
+ cssClass: 'mdl-js-menu',
+ widget: true
+ });
+})();