| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| cr.exportPath('settings'); |
| |
| /** |
| * @enum {string} |
| * A categorization of every possible Settings URL, necessary for implementing |
| * a finite state machine. |
| */ |
| settings.RouteState = { |
| // Initial state before anything has loaded yet. |
| INITIAL: 'initial', |
| // A dialog that has a dedicated URL (e.g. /importData). |
| DIALOG: 'dialog', |
| // A section (basically a scroll position within the top level page, e.g, |
| // /appearance. |
| SECTION: 'section', |
| // A subpage, or sub-subpage e.g, /searchEngins. |
| SUBPAGE: 'subpage', |
| // The top level Settings page, '/'. |
| TOP_LEVEL: 'top-level', |
| }; |
| |
| cr.define('settings', function() { |
| const RouteState = settings.RouteState; |
| |
| /** |
| * @param {?settings.Route} route |
| * @return {!settings.RouteState} |
| */ |
| function classifyRoute(route) { |
| if (!route) { |
| return RouteState.INITIAL; |
| } |
| if (route === settings.routes.BASIC || route === settings.routes.ABOUT) { |
| return RouteState.TOP_LEVEL; |
| } |
| if (route.isSubpage()) { |
| return RouteState.SUBPAGE; |
| } |
| if (route.isNavigableDialog) { |
| return RouteState.DIALOG; |
| } |
| return RouteState.SECTION; |
| } |
| |
| /** |
| * Responds to route changes by expanding, collapsing, or scrolling to |
| * sections on the page. Expanded sections take up the full height of the |
| * container. At most one section should be expanded at any given time. |
| * @polymerBehavior |
| */ |
| const MainPageBehavior = { |
| properties: { |
| /** |
| * Whether a search operation is in progress or previous search results |
| * are being displayed. |
| * @private {boolean} |
| */ |
| inSearchMode: { |
| type: Boolean, |
| value: false, |
| observer: 'inSearchModeChanged_', |
| }, |
| }, |
| |
| /** @type {?HTMLElement} */ |
| scroller: null, |
| |
| /** |
| * A map holding all valid state transitions. |
| * @private {!Map<!settings.RouteState, !settings.RouteState>} |
| */ |
| validTransitions_: (function() { |
| const allStates = new Set([ |
| RouteState.DIALOG, |
| RouteState.SECTION, |
| RouteState.SUBPAGE, |
| RouteState.TOP_LEVEL, |
| ]); |
| |
| return new Map([ |
| [RouteState.INITIAL, allStates], |
| [ |
| RouteState.DIALOG, new Set([ |
| RouteState.SECTION, |
| RouteState.SUBPAGE, |
| RouteState.TOP_LEVEL, |
| ]) |
| ], |
| [RouteState.SECTION, allStates], |
| [RouteState.SUBPAGE, allStates], |
| [RouteState.TOP_LEVEL, allStates], |
| ]); |
| })(), |
| |
| /** @override */ |
| attached: function() { |
| this.scroller = this.domHost ? this.domHost.parentNode : document.body; |
| }, |
| |
| /** |
| * Method to be defined by users of MainPageBehavior. |
| * @param {!settings.Route} route |
| * @return {boolean} Whether the given route is part of |this| page. |
| */ |
| containsRoute: function(route) { |
| return false; |
| }, |
| |
| /** |
| * @param {boolean} current |
| * @param {boolean} previous |
| * @private |
| */ |
| inSearchModeChanged_: function(current, previous) { |
| // Ignore 1st occurrence which happens while the element is being |
| // initialized. |
| if (previous === undefined) { |
| return; |
| } |
| |
| if (!this.inSearchMode) { |
| const route = settings.getCurrentRoute(); |
| if (this.containsRoute(route) && |
| classifyRoute(route) === RouteState.SECTION) { |
| // Re-fire the showing-section event to trigger settings-main |
| // recalculation of the overscroll, now that sections are not |
| // hidden-by-search. |
| this.fire('showing-section', this.getSection(route.section)); |
| } |
| } |
| }, |
| |
| /** |
| * @param {!settings.Route} route |
| * @return {boolean} |
| * @private |
| */ |
| shouldExpandAdvanced_: function(route) { |
| return this.tagName == 'SETTINGS-BASIC-PAGE' && |
| settings.routes.ADVANCED && settings.routes.ADVANCED.contains(route); |
| }, |
| |
| /** |
| * Finds the settings section corresponding to the given route. If the |
| * section is lazily loaded it force-renders it. |
| * Note: If the section resides within "advanced" settings, a |
| * 'hide-container' event is fired (necessary to avoid flashing). Callers |
| * are responsible for firing a 'show-container' event. |
| * @param {!settings.Route} route |
| * @return {!Promise<!SettingsSectionElement>} |
| * @private |
| */ |
| ensureSectionForRoute_: function(route) { |
| const section = this.getSection(route.section); |
| if (section != null) { |
| return Promise.resolve(section); |
| } |
| |
| // TODO(dpapad): Remove condition when Polymer 2 migration is complete. |
| // The function to use to wait for <dom-if>s to render. |
| const waitFn = Polymer.DomIf ? |
| Polymer.RenderStatus.beforeNextRender.bind(null, this) : |
| requestAnimationFrame; |
| |
| return new Promise(resolve => { |
| if (this.shouldExpandAdvanced_(route)) { |
| this.fire('hide-container'); |
| waitFn(() => { |
| this.$$('#advancedPageTemplate').get().then(() => { |
| resolve(this.getSection(route.section)); |
| }); |
| }); |
| } else { |
| waitFn(() => { |
| resolve(this.getSection(route.section)); |
| }); |
| } |
| }); |
| }, |
| |
| /** |
| * @param {!settings.Route} route |
| * @private |
| */ |
| enterSubpage_: function(route) { |
| this.lastScrollTop_ = this.scroller.scrollTop; |
| this.scroller.scrollTop = 0; |
| this.classList.add('showing-subpage'); |
| this.fire('subpage-expand'); |
| this.ensureSectionForRoute_(route).then(section => { |
| section.classList.add('expanded'); |
| // Fire event used by a11y tests only. |
| this.fire('settings-section-expanded'); |
| |
| this.fire('show-container'); |
| }); |
| }, |
| |
| /** |
| * @param {!settings.Route} oldRoute |
| * @private |
| */ |
| enterMainPage_: function(oldRoute) { |
| const oldSection = this.getSection(oldRoute.section); |
| oldSection.classList.remove('expanded'); |
| this.classList.remove('showing-subpage'); |
| requestAnimationFrame(() => { |
| if (settings.lastRouteChangeWasPopstate()) { |
| this.scroller.scrollTop = this.lastScrollTop_; |
| } |
| this.fire('showing-main-page'); |
| }); |
| }, |
| |
| /** |
| * @param {!settings.Route} route |
| * @private |
| */ |
| scrollToSection_: function(route) { |
| this.ensureSectionForRoute_(route).then(section => { |
| if (!this.inSearchMode) { |
| this.fire('showing-section', section); |
| } |
| this.fire('show-container'); |
| }); |
| }, |
| |
| /** |
| * Detects which state transition is appropriate for the given new/old |
| * routes. |
| * @param {!settings.Route} newRoute |
| * @param {settings.Route} oldRoute |
| * @private |
| */ |
| getStateTransition_(newRoute, oldRoute) { |
| const containsNew = this.containsRoute(newRoute); |
| const containsOld = this.containsRoute(oldRoute); |
| |
| if (!containsNew && !containsOld) { |
| // Nothing to do, since none of the old/new routes belong to this page. |
| return null; |
| } |
| |
| // Case where going from |this| page to an unrelated page. For example: |
| // |this| is settings-basic-page AND |
| // oldRoute is /searchEngines AND |
| // newRoute is /help. |
| if (containsOld && !containsNew) { |
| return [classifyRoute(oldRoute), RouteState.TOP_LEVEL]; |
| } |
| |
| // Case where return from an unrelated page to |this| page. For example: |
| // |this| is settings-basic-page AND |
| // oldRoute is /help AND |
| // newRoute is /searchEngines |
| if (!containsOld && containsNew) { |
| return [RouteState.TOP_LEVEL, classifyRoute(newRoute)]; |
| } |
| |
| // Case where transitioning between routes that both belong to |this| |
| // page. |
| return [classifyRoute(oldRoute), classifyRoute(newRoute)]; |
| }, |
| |
| /** |
| * @param {!settings.Route} newRoute |
| * @param {settings.Route} oldRoute |
| */ |
| currentRouteChanged(newRoute, oldRoute) { |
| const transition = this.getStateTransition_(newRoute, oldRoute); |
| if (transition === null) { |
| return; |
| } |
| |
| const oldState = transition[0]; |
| const newState = transition[1]; |
| assert(this.validTransitions_.get(oldState).has(newState)); |
| |
| if (oldState == RouteState.TOP_LEVEL) { |
| if (newState == RouteState.SECTION) { |
| this.scrollToSection_(newRoute); |
| } else if (newState == RouteState.SUBPAGE) { |
| this.enterSubpage_(newRoute); |
| } |
| // Nothing to do here for the case of RouteState.DIALOG or TOP_LEVEL. |
| // The latter happens when navigating from '/?search=foo' to '/' |
| // (clearing search results). |
| return; |
| } |
| |
| if (oldState == RouteState.SECTION) { |
| if (newState == RouteState.SECTION) { |
| this.scrollToSection_(newRoute); |
| } else if (newState == RouteState.SUBPAGE) { |
| this.enterSubpage_(newRoute); |
| } else if (newState == RouteState.TOP_LEVEL) { |
| this.scroller.scrollTop = 0; |
| } |
| // Nothing to do here for the case of RouteState.DIALOG. |
| return; |
| } |
| |
| if (oldState == RouteState.SUBPAGE) { |
| if (newState == RouteState.SECTION) { |
| this.enterMainPage_(oldRoute); |
| |
| // Scroll to the corresponding section, only if the user explicitly |
| // navigated to a section (via the menu). |
| if (!settings.lastRouteChangeWasPopstate()) { |
| this.scrollToSection_(newRoute); |
| } |
| } else if (newState == RouteState.SUBPAGE) { |
| // Handle case where the two subpages belong to |
| // different sections, but are linked to each other. For example |
| // /storage and /accounts (in ChromeOS). |
| if (!oldRoute.contains(newRoute) && !newRoute.contains(oldRoute)) { |
| this.enterMainPage_(oldRoute); |
| this.enterSubpage_(newRoute); |
| return; |
| } |
| |
| // Handle case of subpage to sub-subpage navigation. |
| if (oldRoute.contains(newRoute)) { |
| this.scroller.scrollTop = 0; |
| return; |
| } |
| // When going from a sub-subpage to its parent subpage, scroll |
| // position is automatically restored, because we focus the |
| // sub-subpage entry point. |
| } else if (newState == RouteState.TOP_LEVEL) { |
| this.enterMainPage_(oldRoute); |
| } else if (newState == RouteState.DIALOG) { |
| // The only known case currently for such a transition is from |
| // /storage to /clearBrowserData. |
| this.enterMainPage_(oldRoute); |
| } |
| return; |
| } |
| |
| if (oldState == RouteState.INITIAL) { |
| if (newState == RouteState.SECTION) { |
| this.scrollToSection_(newRoute); |
| } else if (newState == RouteState.SUBPAGE) { |
| this.enterSubpage_(newRoute); |
| } |
| // Nothing to do here for the case of RouteState.DIALOG and TOP_LEVEL. |
| return; |
| } |
| |
| if (oldState == RouteState.DIALOG) { |
| if (newState == RouteState.SUBPAGE) { |
| // The only known case currently for such a transition is from |
| // /clearBrowserData back to /storage. |
| this.enterSubpage_(newRoute); |
| } |
| // Nothing to do for all other cases. |
| } |
| }, |
| |
| /** |
| * TODO(dpapad): Rename this to |querySection| to distinguish it from |
| * ensureSectionForRoute_() which force-renders the section as needed. |
| * Helper function to get a section from the local DOM. |
| * @param {string} section Section name of the element to get. |
| * @return {?SettingsSectionElement} |
| */ |
| getSection: function(section) { |
| if (!section) { |
| return null; |
| } |
| return /** @type {?SettingsSectionElement} */ ( |
| this.$$(`settings-section[section="${section}"]`)); |
| }, |
| }; |
| |
| return {MainPageBehavior: MainPageBehavior}; |
| }); |
