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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
let {addonRoot, addonName} = require("info");
let branchName = "extensions." + addonName + ".";
let branch = Services.prefs.getBranch(branchName);
let preconfiguredBranch =
Services.prefs.getBranch(branchName + "preconfigured.");
let ignorePrefChanges = false;
function init()
{
// Load default preferences and set up properties for them
let defaultBranch = Services.prefs.getDefaultBranch(branchName);
let prefsData = require("prefs.json");
let defaults = prefsData.defaults;
let preconfigurable = new Set(prefsData.preconfigurable);
for (let pref in defaults)
{
let value = defaults[pref];
let [getter, setter] = typeMap[typeof value];
if (preconfigurable.has(pref))
{
try
{
value = getter(preconfiguredBranch, pref);
}
catch (e) {}
}
setter(defaultBranch, pref, value);
defineProperty(pref, false, getter, setter);
}
// Add preference change observer
try
{
branch.QueryInterface(Ci.nsIPrefBranch2).addObserver("", Prefs, true);
onShutdown.add(() => branch.removeObserver("", Prefs));
}
catch (e)
{
Cu.reportError(e);
}
}
/**
* Sets up getter/setter on Prefs object for preference.
*/
function defineProperty(/**String*/ name, defaultValue, /**Function*/ readFunc, /**Function*/ writeFunc)
{
let value = defaultValue;
Prefs["_update_" + name] = () =>
{
try
{
value = readFunc(branch, name);
triggerListeners(name);
}
catch(e)
{
Cu.reportError(e);
}
};
Object.defineProperty(Prefs, name, {
enumerable: true,
get: () => value,
set: (newValue) =>
{
if (value == newValue)
return value;
try
{
ignorePrefChanges = true;
writeFunc(branch, name, newValue);
value = newValue;
Services.prefs.savePrefFile(null);
triggerListeners(name);
}
catch(e)
{
Cu.reportError(e);
}
finally
{
ignorePrefChanges = false;
}
return value;
}
});
Prefs["_update_" + name]();
}
let listeners = [];
function triggerListeners(/**String*/ name)
{
for (let i = 0; i < listeners.length; i++)
{
try
{
listeners[i](name);
}
catch(e)
{
Cu.reportError(e);
}
}
}
/**
* Manages the preferences for an extension, object properties corresponding
* to extension's preferences are added automatically. Setting the property
* will automatically change the preference, external preference changes are
* also recognized automatically.
*/
let Prefs = exports.Prefs =
{
/**
* Migrates an old preference to a new name.
*/
migrate: function(/**String*/ oldName, /**String*/ newName)
{
if (newName in this && Services.prefs.prefHasUserValue(oldName))
{
let [getter, setter] = typeMap[typeof this[newName]];
try
{
this[newName] = getter(Services.prefs, oldName);
} catch(e) {}
Services.prefs.clearUserPref(oldName);
}
},
/**
* Adds a preferences listener that will be fired whenever a preference
* changes.
*/
addListener: function(/**Function*/ listener)
{
if (listeners.indexOf(listener) < 0)
listeners.push(listener);
},
/**
* Removes a preferences listener.
*/
removeListener: function(/**Function*/ listener)
{
let index = listeners.indexOf(listener);
if (index >= 0)
listeners.splice(index, 1);
},
observe: function(subject, topic, data)
{
if (ignorePrefChanges || topic != "nsPref:changed")
return;
if ("_update_" + data in this)
this["_update_" + data]();
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupportsWeakReference, Ci.nsIObserver])
};
let getIntPref = (branch, pref) => branch.getIntPref(pref);
let setIntPref = (branch, pref, newValue) => branch.setIntPref(pref, newValue);
let getBoolPref = (branch, pref) => branch.getBoolPref(pref);
let setBoolPref = (branch, pref, newValue) => branch.setBoolPref(pref, newValue);
let getCharPref = (branch, pref) => branch.getComplexValue(pref, Ci.nsISupportsString).data;
let setCharPref = (branch, pref, newValue) =>
{
let str = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsString);
str.data = newValue;
branch.setComplexValue(pref, Ci.nsISupportsString, str);
};
let getJSONPref = (branch, pref) => JSON.parse(getCharPref(branch, pref));
let setJSONPref = (branch, pref, newValue) => setCharPref(branch, pref, JSON.stringify(newValue));
// Getter/setter functions for difference preference types
let typeMap =
{
boolean: [getBoolPref, setBoolPref],
number: [getIntPref, setIntPref],
string: [getCharPref, setCharPref],
object: [getJSONPref, setJSONPref]
};
init();
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