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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
* 'cr-settings-prefs' is an element which serves as a model for
* interaction with settings which are stored in Chrome's
* Preferences.
*
* Example:
*
* <cr-settings-prefs id="prefs"></cr-settings-prefs>
* <cr-settings-a11y-page prefs="{{this.$.prefs}}"></cr-settings-a11y-page>
*
* @group Chrome Settings Elements
* @element cr-settings-a11y-page
*/
(function() {
'use strict';
Polymer({
is: 'cr-settings-prefs',
properties: {
/**
* Object containing all preferences.
*/
prefStore: {
type: Object,
value: function() { return {}; },
notify: true,
},
},
/** @override */
created: function() {
CrSettingsPrefs.isInitialized = false;
chrome.settingsPrivate.onPrefsChanged.addListener(
this.onPrefsChanged_.bind(this));
chrome.settingsPrivate.getAllPrefs(this.onPrefsFetched_.bind(this));
},
/**
* Called when prefs in the underlying Chrome pref store are changed.
* @param {!Array<!chrome.settingsPrivate.PrefObject>} prefs The prefs that
* changed.
* @private
*/
onPrefsChanged_: function(prefs) {
this.updatePrefs_(prefs, false);
},
/**
* Called when prefs are fetched from settingsPrivate.
* @param {!Array<!chrome.settingsPrivate.PrefObject>} prefs
* @private
*/
onPrefsFetched_: function(prefs) {
this.updatePrefs_(prefs, true);
CrSettingsPrefs.isInitialized = true;
document.dispatchEvent(new Event(CrSettingsPrefs.INITIALIZED));
},
/**
* Updates the settings model with the given prefs.
* @param {!Array<!chrome.settingsPrivate.PrefObject>} prefs
* @param {boolean} shouldObserve Whether to add an ObjectObserver for each
* of the prefs.
* @private
*/
updatePrefs_: function(prefs, shouldObserve) {
prefs.forEach(function(prefObj) {
let root = this.prefStore;
let tokens = prefObj.key.split('.');
assert(tokens.length > 0);
for (let i = 0; i < tokens.length; i++) {
let token = tokens[i];
if (!root.hasOwnProperty(token)) {
let path = 'prefStore.' + tokens.slice(0, i + 1).join('.');
this.setPathValue(path, {});
}
root = root[token];
}
// NOTE: Do this copy rather than just a re-assignment, so that the
// ObjectObserver fires.
for (let objKey in prefObj) {
let path = 'prefStore.' + prefObj.key + '.' + objKey;
this.setPathValue(path, prefObj[objKey]);
}
if (shouldObserve) {
let keyObserver = new ObjectObserver(root);
keyObserver.open(
this.propertyChangeCallback_.bind(this, prefObj.key));
}
}, this);
},
/**
* Called when a property of a pref changes.
* @param {string} propertyPath The path before the property names.
* @param {!Array<string>} added An array of keys which were added.
* @param {!Array<string>} removed An array of keys which were removed.
* @param {!Array<string>} changed An array of keys of properties whose
* values changed.
* @param {function(string) : *} getOldValueFn A function which takes a
* property name and returns the old value for that property.
* @private
*/
propertyChangeCallback_: function(
propertyPath, added, removed, changed, getOldValueFn) {
for (let property in changed) {
// UI should only be able to change the value of a setting for now, not
// disabled, etc.
assert(property == 'value');
let newValue = changed[property];
assert(newValue !== undefined);
chrome.settingsPrivate.setPref(
propertyPath,
newValue,
/* pageId */ '',
/* callback */ function() {});
}
},
});
})();
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