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// Copyright 2015 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.
/**
* @fileoverview
* 'settings-router' is a simple router for settings. Its responsibilites:
* - Update the URL when the routing state changes.
* - Initialize the routing state with the initial URL.
* - Process and validate all routing state changes.
*
* Example:
*
* <settings-router current-route="{{currentRoute}}">
* </settings-router>
*
* @group Chrome Settings Elements
* @element settings-router
*/
Polymer({
is: 'settings-router',
properties: {
/**
* The current active route. This is reflected to the URL. Updates to this
* property should replace the whole object.
*
* currentRoute.page refers to top-level pages such as Basic and Advanced.
*
* currentRoute.section is only non-empty when the user is on a subpage. If
* the user is on Basic, for instance, this is an empty string.
*
* currentRoute.subpage is an Array. The last element is the actual subpage
* the user is on. The previous elements are the ancestor subpages. This
* enables support for multiple paths to the same subpage. This is used by
* both the Back button and the Breadcrumb to determine ancestor subpages.
*/
currentRoute: {
notify: true,
observer: 'currentRouteChanged_',
type: Object,
value: function() {
// Take the current URL, find a matching pre-defined route, and
// initialize the currentRoute to that pre-defined route.
for (var i = 0; i < this.routes_.length; ++i) {
var route = this.routes_[i];
if (route.url == window.location.pathname) {
return {
page: route.page,
section: route.section,
subpage: route.subpage,
};
}
}
// As a fallback return the default route.
return this.routes_[0];
},
},
/**
* Page titles for the currently active route. Updated by the currentRoute
* property observer.
* @type {{pageTitle: string, subpageTitles: Array<string>}}
*/
currentRouteTitles: {
notify: true,
type: Object,
value: function() { return {}; },
},
},
/**
* @private
* The 'url' property is not accessible to other elements.
*/
routes_: [
{
url: '/',
page: 'basic',
section: '',
subpage: [],
subpageTitles: [],
},
{
url: '/advanced',
page: 'advanced',
section: '',
subpage: [],
subpageTitles: [],
},
{
url: '/startup',
page: 'basic',
section: 'on-startup',
subpage: ['startup-urls'],
subpageTitles: ['onStartupSetPages'],
},
{
url: '/searchEngines',
page: 'basic',
section: 'search',
subpage: ['search-engines'],
subpageTitles: ['searchEnginesPageTitle'],
},
{
url: '/searchEngines/advanced',
page: 'basic',
section: 'search',
subpage: ['search-engines', 'search-engines-advanced'],
subpageTitles: ['searchEnginesPageTitle', 'advancedPageTitle'],
},
{
url: '/certificates',
page: 'advanced',
section: 'privacy',
subpage: ['manage-certificates'],
subpageTitles: ['manageCertificates'],
},
{
url: '/content',
page: 'advanced',
section: 'privacy',
subpage: ['site-settings'],
subpageTitles: ['siteSettings'],
},
{
url: '/clearBrowserData',
page: 'advanced',
section: 'privacy',
subpage: ['clear-browsing-data'],
subpageTitles: ['clearBrowsingData'],
},
{
url: '/networkDetail',
page: 'basic',
section: 'internet',
subpage: ['network-detail'],
subpageTitles: ['internetDetailPageTitle'],
},
{
url: '/knownNetworks',
page: 'basic',
section: 'internet',
subpage: ['known-networks'],
subpageTitles: ['internetKnownNetworksPageTitle'],
},
{
url: '/languages',
page: 'advanced',
section: 'languages',
subpage: ['manage-languages'],
subpageTitles: ['manageLanguagesPageTitle'],
},
{
url: '/languages/edit',
page: 'advanced',
section: 'languages',
subpage: ['language-detail'],
subpageTitles: ['manageLanguagesPageTitle'],
},
],
/**
* Sets up a history popstate observer.
*/
created: function() {
window.addEventListener('popstate', function(event) {
if (event.state && event.state.page)
this.currentRoute = event.state;
}.bind(this));
},
/**
* @private
* Is called when another element modifies the route. This observer validates
* the route change against the pre-defined list of routes, and updates the
* URL appropriately.
*/
currentRouteChanged_: function(newRoute, oldRoute) {
for (var i = 0; i < this.routes_.length; ++i) {
var route = this.routes_[i];
if (route.page == newRoute.page && route.section == newRoute.section &&
route.subpage.length == newRoute.subpage.length &&
newRoute.subpage.every(function(value, index) {
return value == route.subpage[index];
})) {
// Update the property containing the titles for the current route.
this.currentRouteTitles = {
pageTitle: loadTimeData.getString(route.page + 'PageTitle'),
subpageTitles: route.subpageTitles.map(function(titleCode) {
return loadTimeData.getString(titleCode);
}),
};
// If we are restoring a state from history, don't push it again.
if (newRoute.inHistory)
return;
// Mark routes persisted in history as already stored in history.
var historicState = {
inHistory: true,
page: newRoute.page,
section: newRoute.section,
subpage: newRoute.subpage,
};
// Push the current route to the history state, so when the user
// navigates with the browser back button, we can recall the route.
if (oldRoute) {
history.pushState(historicState, null, route.url);
} else {
// For the very first route (oldRoute will be undefined), we replace
// the existing state instead of pushing a new one. This is to allow
// the user to use the browser back button to exit Settings entirely.
history.replaceState(historicState, null);
}
return;
}
}
assertNotReached('Route not found: ' + JSON.stringify(newRoute));
},
});
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