454 lines
16 KiB
JavaScript
454 lines
16 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 Layout 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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* @constructor
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* @param {HTMLElement} element The element that will be upgraded.
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*/
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var MaterialLayout = function MaterialLayout(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.MaterialLayout = MaterialLayout;
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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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MaterialLayout.prototype.Constant_ = {
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MAX_WIDTH: '(max-width: 1024px)',
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TAB_SCROLL_PIXELS: 100,
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MENU_ICON: 'menu',
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CHEVRON_LEFT: 'chevron_left',
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CHEVRON_RIGHT: 'chevron_right'
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};
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/**
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* Modes.
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*
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* @enum {number}
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* @private
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*/
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MaterialLayout.prototype.Mode_ = {
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STANDARD: 0,
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SEAMED: 1,
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WATERFALL: 2,
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SCROLL: 3
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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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MaterialLayout.prototype.CssClasses_ = {
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CONTAINER: 'mdl-layout__container',
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HEADER: 'mdl-layout__header',
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DRAWER: 'mdl-layout__drawer',
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CONTENT: 'mdl-layout__content',
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DRAWER_BTN: 'mdl-layout__drawer-button',
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ICON: 'material-icons',
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JS_RIPPLE_EFFECT: 'mdl-js-ripple-effect',
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RIPPLE_CONTAINER: 'mdl-layout__tab-ripple-container',
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RIPPLE: 'mdl-ripple',
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RIPPLE_IGNORE_EVENTS: 'mdl-js-ripple-effect--ignore-events',
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HEADER_SEAMED: 'mdl-layout__header--seamed',
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HEADER_WATERFALL: 'mdl-layout__header--waterfall',
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HEADER_SCROLL: 'mdl-layout__header--scroll',
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FIXED_HEADER: 'mdl-layout--fixed-header',
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OBFUSCATOR: 'mdl-layout__obfuscator',
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TAB_BAR: 'mdl-layout__tab-bar',
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TAB_CONTAINER: 'mdl-layout__tab-bar-container',
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TAB: 'mdl-layout__tab',
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TAB_BAR_BUTTON: 'mdl-layout__tab-bar-button',
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TAB_BAR_LEFT_BUTTON: 'mdl-layout__tab-bar-left-button',
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TAB_BAR_RIGHT_BUTTON: 'mdl-layout__tab-bar-right-button',
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PANEL: 'mdl-layout__tab-panel',
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HAS_DRAWER: 'has-drawer',
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HAS_TABS: 'has-tabs',
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HAS_SCROLLING_HEADER: 'has-scrolling-header',
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CASTING_SHADOW: 'is-casting-shadow',
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IS_COMPACT: 'is-compact',
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IS_SMALL_SCREEN: 'is-small-screen',
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IS_DRAWER_OPEN: 'is-visible',
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IS_ACTIVE: 'is-active',
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IS_UPGRADED: 'is-upgraded',
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IS_ANIMATING: 'is-animating',
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ON_LARGE_SCREEN: 'mdl-layout--large-screen-only',
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ON_SMALL_SCREEN: 'mdl-layout--small-screen-only'
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};
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/**
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* Handles scrolling on the content.
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*
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* @private
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*/
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MaterialLayout.prototype.contentScrollHandler_ = function() {
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if (this.header_.classList.contains(this.CssClasses_.IS_ANIMATING)) {
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return;
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}
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if (this.content_.scrollTop > 0 &&
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!this.header_.classList.contains(this.CssClasses_.IS_COMPACT)) {
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this.header_.classList.add(this.CssClasses_.CASTING_SHADOW);
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this.header_.classList.add(this.CssClasses_.IS_COMPACT);
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this.header_.classList.add(this.CssClasses_.IS_ANIMATING);
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} else if (this.content_.scrollTop <= 0 &&
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this.header_.classList.contains(this.CssClasses_.IS_COMPACT)) {
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this.header_.classList.remove(this.CssClasses_.CASTING_SHADOW);
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this.header_.classList.remove(this.CssClasses_.IS_COMPACT);
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this.header_.classList.add(this.CssClasses_.IS_ANIMATING);
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}
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};
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/**
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* Handles changes in screen size.
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*
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* @private
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*/
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MaterialLayout.prototype.screenSizeHandler_ = function() {
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if (this.screenSizeMediaQuery_.matches) {
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this.element_.classList.add(this.CssClasses_.IS_SMALL_SCREEN);
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} else {
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this.element_.classList.remove(this.CssClasses_.IS_SMALL_SCREEN);
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// Collapse drawer (if any) when moving to a large screen size.
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if (this.drawer_) {
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this.drawer_.classList.remove(this.CssClasses_.IS_DRAWER_OPEN);
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}
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}
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};
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/**
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* Handles toggling of the drawer.
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*
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* @private
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*/
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MaterialLayout.prototype.drawerToggleHandler_ = function() {
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this.drawer_.classList.toggle(this.CssClasses_.IS_DRAWER_OPEN);
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};
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/**
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* Handles (un)setting the `is-animating` class
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*
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* @private
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*/
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MaterialLayout.prototype.headerTransitionEndHandler_ = function() {
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this.header_.classList.remove(this.CssClasses_.IS_ANIMATING);
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};
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/**
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* Handles expanding the header on click
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*
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* @private
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*/
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MaterialLayout.prototype.headerClickHandler_ = function() {
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if (this.header_.classList.contains(this.CssClasses_.IS_COMPACT)) {
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this.header_.classList.remove(this.CssClasses_.IS_COMPACT);
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this.header_.classList.add(this.CssClasses_.IS_ANIMATING);
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}
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};
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/**
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* Reset tab state, dropping active classes
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*
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* @private
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*/
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MaterialLayout.prototype.resetTabState_ = function(tabBar) {
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for (var k = 0; k < tabBar.length; k++) {
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tabBar[k].classList.remove(this.CssClasses_.IS_ACTIVE);
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}
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};
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/**
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* Reset panel state, droping active classes
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*
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* @private
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*/
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MaterialLayout.prototype.resetPanelState_ = function(panels) {
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for (var j = 0; j < panels.length; j++) {
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panels[j].classList.remove(this.CssClasses_.IS_ACTIVE);
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}
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};
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/**
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* Initialize element.
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*/
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MaterialLayout.prototype.init = function() {
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if (this.element_) {
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var container = document.createElement('div');
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container.classList.add(this.CssClasses_.CONTAINER);
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this.element_.parentElement.insertBefore(container, this.element_);
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this.element_.parentElement.removeChild(this.element_);
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container.appendChild(this.element_);
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var directChildren = this.element_.childNodes;
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for (var c = 0; c < directChildren.length; c++) {
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var child = directChildren[c];
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if (child.classList &&
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child.classList.contains(this.CssClasses_.HEADER)) {
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this.header_ = child;
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}
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if (child.classList &&
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child.classList.contains(this.CssClasses_.DRAWER)) {
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this.drawer_ = child;
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}
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if (child.classList &&
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child.classList.contains(this.CssClasses_.CONTENT)) {
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this.content_ = child;
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}
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}
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if (this.header_) {
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this.tabBar_ = this.header_.querySelector('.' + this.CssClasses_.TAB_BAR);
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}
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var mode = this.Mode_.STANDARD;
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// Keep an eye on screen size, and add/remove auxiliary class for styling
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// of small screens.
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this.screenSizeMediaQuery_ = window.matchMedia(
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/** @type {string} */ (this.Constant_.MAX_WIDTH));
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this.screenSizeMediaQuery_.addListener(this.screenSizeHandler_.bind(this));
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this.screenSizeHandler_();
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if (this.header_) {
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if (this.header_.classList.contains(this.CssClasses_.HEADER_SEAMED)) {
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mode = this.Mode_.SEAMED;
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} else if (this.header_.classList.contains(
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this.CssClasses_.HEADER_WATERFALL)) {
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mode = this.Mode_.WATERFALL;
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this.header_.addEventListener('transitionend',
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this.headerTransitionEndHandler_.bind(this));
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this.header_.addEventListener('click',
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this.headerClickHandler_.bind(this));
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} else if (this.header_.classList.contains(
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this.CssClasses_.HEADER_SCROLL)) {
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mode = this.Mode_.SCROLL;
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container.classList.add(this.CssClasses_.HAS_SCROLLING_HEADER);
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}
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if (mode === this.Mode_.STANDARD) {
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this.header_.classList.add(this.CssClasses_.CASTING_SHADOW);
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if (this.tabBar_) {
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this.tabBar_.classList.add(this.CssClasses_.CASTING_SHADOW);
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}
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} else if (mode === this.Mode_.SEAMED || mode === this.Mode_.SCROLL) {
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this.header_.classList.remove(this.CssClasses_.CASTING_SHADOW);
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if (this.tabBar_) {
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this.tabBar_.classList.remove(this.CssClasses_.CASTING_SHADOW);
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}
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} else if (mode === this.Mode_.WATERFALL) {
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// Add and remove shadows depending on scroll position.
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// Also add/remove auxiliary class for styling of the compact version of
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// the header.
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this.content_.addEventListener('scroll',
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this.contentScrollHandler_.bind(this));
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this.contentScrollHandler_();
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}
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}
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/**
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* Prevents an event from triggering the default behaviour.
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* @param {Event} ev the event to eat.
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*/
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var eatEvent = function(ev) {
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ev.preventDefault();
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};
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// Add drawer toggling button to our layout, if we have an openable drawer.
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if (this.drawer_) {
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var drawerButton = document.createElement('div');
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drawerButton.classList.add(this.CssClasses_.DRAWER_BTN);
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if (this.drawer_.classList.contains(this.CssClasses_.ON_LARGE_SCREEN)) {
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//If drawer has ON_LARGE_SCREEN class then add it to the drawer toggle button as well.
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drawerButton.classList.add(this.CssClasses_.ON_LARGE_SCREEN);
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} else if (this.drawer_.classList.contains(this.CssClasses_.ON_SMALL_SCREEN)) {
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//If drawer has ON_SMALL_SCREEN class then add it to the drawer toggle button as well.
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drawerButton.classList.add(this.CssClasses_.ON_SMALL_SCREEN);
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}
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var drawerButtonIcon = document.createElement('i');
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drawerButtonIcon.classList.add(this.CssClasses_.ICON);
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drawerButtonIcon.textContent = this.Constant_.MENU_ICON;
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drawerButton.appendChild(drawerButtonIcon);
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drawerButton.addEventListener('click',
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this.drawerToggleHandler_.bind(this));
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// Add a class if the layout has a drawer, for altering the left padding.
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// Adds the HAS_DRAWER to the elements since this.header_ may or may
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// not be present.
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this.element_.classList.add(this.CssClasses_.HAS_DRAWER);
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this.drawer_.addEventListener('mousewheel', eatEvent);
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// If we have a fixed header, add the button to the header rather than
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// the layout.
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if (this.element_.classList.contains(this.CssClasses_.FIXED_HEADER)) {
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this.header_.insertBefore(drawerButton, this.header_.firstChild);
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} else {
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this.element_.insertBefore(drawerButton, this.content_);
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}
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var obfuscator = document.createElement('div');
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obfuscator.classList.add(this.CssClasses_.OBFUSCATOR);
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this.element_.appendChild(obfuscator);
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obfuscator.addEventListener('click',
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this.drawerToggleHandler_.bind(this));
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obfuscator.addEventListener('mousewheel', eatEvent);
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}
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// Initialize tabs, if any.
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if (this.header_ && this.tabBar_) {
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this.element_.classList.add(this.CssClasses_.HAS_TABS);
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var tabContainer = document.createElement('div');
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tabContainer.classList.add(this.CssClasses_.TAB_CONTAINER);
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this.header_.insertBefore(tabContainer, this.tabBar_);
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this.header_.removeChild(this.tabBar_);
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var leftButton = document.createElement('div');
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leftButton.classList.add(this.CssClasses_.TAB_BAR_BUTTON);
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leftButton.classList.add(this.CssClasses_.TAB_BAR_LEFT_BUTTON);
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var leftButtonIcon = document.createElement('i');
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leftButtonIcon.classList.add(this.CssClasses_.ICON);
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leftButtonIcon.textContent = this.Constant_.CHEVRON_LEFT;
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leftButton.appendChild(leftButtonIcon);
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leftButton.addEventListener('click', function() {
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this.tabBar_.scrollLeft -= this.Constant_.TAB_SCROLL_PIXELS;
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}.bind(this));
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var rightButton = document.createElement('div');
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rightButton.classList.add(this.CssClasses_.TAB_BAR_BUTTON);
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rightButton.classList.add(this.CssClasses_.TAB_BAR_RIGHT_BUTTON);
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var rightButtonIcon = document.createElement('i');
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rightButtonIcon.classList.add(this.CssClasses_.ICON);
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rightButtonIcon.textContent = this.Constant_.CHEVRON_RIGHT;
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rightButton.appendChild(rightButtonIcon);
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rightButton.addEventListener('click', function() {
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this.tabBar_.scrollLeft += this.Constant_.TAB_SCROLL_PIXELS;
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}.bind(this));
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tabContainer.appendChild(leftButton);
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tabContainer.appendChild(this.tabBar_);
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tabContainer.appendChild(rightButton);
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// Add and remove buttons depending on scroll position.
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var tabScrollHandler = function() {
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if (this.tabBar_.scrollLeft > 0) {
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leftButton.classList.add(this.CssClasses_.IS_ACTIVE);
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} else {
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leftButton.classList.remove(this.CssClasses_.IS_ACTIVE);
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}
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if (this.tabBar_.scrollLeft <
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this.tabBar_.scrollWidth - this.tabBar_.offsetWidth) {
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rightButton.classList.add(this.CssClasses_.IS_ACTIVE);
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} else {
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rightButton.classList.remove(this.CssClasses_.IS_ACTIVE);
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}
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}.bind(this);
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this.tabBar_.addEventListener('scroll', tabScrollHandler);
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tabScrollHandler();
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if (this.tabBar_.classList.contains(this.CssClasses_.JS_RIPPLE_EFFECT)) {
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this.tabBar_.classList.add(this.CssClasses_.RIPPLE_IGNORE_EVENTS);
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}
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// Select element tabs, document panels
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var tabs = this.tabBar_.querySelectorAll('.' + this.CssClasses_.TAB);
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var panels = this.content_.querySelectorAll('.' + this.CssClasses_.PANEL);
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// Create new tabs for each tab element
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for (var i = 0; i < tabs.length; i++) {
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new MaterialLayoutTab(tabs[i], tabs, panels, this);
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}
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}
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this.element_.classList.add(this.CssClasses_.IS_UPGRADED);
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}
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};
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/**
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* Constructor for an individual tab.
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*
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* @constructor
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* @param {HTMLElement} tab The HTML element for the tab.
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* @param {!Array<HTMLElement>} tabs Array with HTML elements for all tabs.
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* @param {!Array<HTMLElement>} panels Array with HTML elements for all panels.
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* @param {MaterialLayout} layout The MaterialLayout object that owns the tab.
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*/
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function MaterialLayoutTab(tab, tabs, panels, layout) {
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if (tab) {
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if (layout.tabBar_.classList.contains(
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layout.CssClasses_.JS_RIPPLE_EFFECT)) {
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var rippleContainer = document.createElement('span');
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rippleContainer.classList.add(layout.CssClasses_.RIPPLE_CONTAINER);
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rippleContainer.classList.add(layout.CssClasses_.JS_RIPPLE_EFFECT);
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var ripple = document.createElement('span');
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ripple.classList.add(layout.CssClasses_.RIPPLE);
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rippleContainer.appendChild(ripple);
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tab.appendChild(rippleContainer);
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}
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tab.addEventListener('click', function(e) {
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e.preventDefault();
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var href = tab.href.split('#')[1];
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var panel = layout.content_.querySelector('#' + href);
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layout.resetTabState_(tabs);
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layout.resetPanelState_(panels);
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tab.classList.add(layout.CssClasses_.IS_ACTIVE);
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panel.classList.add(layout.CssClasses_.IS_ACTIVE);
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});
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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: MaterialLayout,
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classAsString: 'MaterialLayout',
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cssClass: 'mdl-js-layout'
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});
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})();
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