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Bug 960257 - [AccessFu] Introduce SettingCache in Utils.jsm. r=yzen

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This commit is contained in:
Eitan Isaacson 2014-01-23 10:37:38 -08:00
parent 79adfff128
commit bf34fc35ee
1 changed files with 34 additions and 1 deletions
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35
accessible/src/jsat/Utils.jsm
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@ -20,7 +20,7 @@ XPCOMUtils.defineLazyModuleGetter(this, 'Events',
XPCOMUtils.defineLazyModuleGetter(this, 'Relations',
'resource://gre/modules/accessibility/Constants.jsm');
this.EXPORTED_SYMBOLS = ['Utils', 'Logger', 'PivotContext', 'PrefCache'];
this.EXPORTED_SYMBOLS = ['Utils', 'Logger', 'PivotContext', 'PrefCache', 'SettingCache'];
this.Utils = {
_buildAppMap: {
@ -774,3 +774,36 @@ PrefCache.prototype = {
QueryInterface : XPCOMUtils.generateQI([Ci.nsIObserver,
Ci.nsISupportsWeakReference])
};
this.SettingCache = function SettingCache(aName, aCallback, aOptions = {}) {
this.value = aOptions.defaultValue;
let runCallback = () => {
if (aCallback && aOptions.callbackNow) {
aCallback(aName, this.value);
if (aOptions.callbackOnce) {
runCallback = () => {};
}
}
};
let settings = Utils.win.navigator.mozSettings;
if (!settings) {
runCallback();
return;
}
let lock = settings.createLock();
let req = lock.get(aName);
req.addEventListener('success', () => {
this.value = req.result[aName] == undefined ? aOptions.defaultValue : req.result[aName];
runCallback();
});
settings.addObserver(aName,
(evt) => {
this.value = evt.settingValue;
runCallback();
});
};