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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* 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/. */
"use strict";
const Cu = Components.utils;
const {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
// Load devtools module lazily.
XPCOMUtils.defineLazyGetter(this, "devtools", function () {
const {devtools} = Cu.import("resource://devtools/shared/Loader.jsm", {});
return devtools;
});
// Load JsonView services lazily.
XPCOMUtils.defineLazyGetter(this, "JsonViewService", function () {
const {JsonViewService} = devtools.require("devtools/client/jsonview/converter-child");
return JsonViewService;
});
XPCOMUtils.defineLazyGetter(this, "JsonViewSniffer", function () {
const {JsonViewSniffer} = devtools.require("devtools/client/jsonview/converter-sniffer");
return JsonViewSniffer;
});
// Constants
const JSON_VIEW_PREF = "devtools.jsonview.enabled";
/**
* Listen for 'devtools.jsonview.enabled' preference changes and
* register/unregister the JSON View XPCOM services as appropriate.
*/
function ConverterObserver() {
}
ConverterObserver.prototype = {
initialize: function () {
// Only the DevEdition has this feature available by default.
// Users need to manually flip 'devtools.jsonview.enabled' preference
// to have it available in other distributions.
if (this.isEnabled()) {
this.register();
}
Services.prefs.addObserver(JSON_VIEW_PREF, this, false);
Services.obs.addObserver(this, "xpcom-shutdown", false);
},
observe: function (subject, topic, data) {
switch (topic) {
case "xpcom-shutdown":
this.onShutdown();
break;
case "nsPref:changed":
this.onPrefChanged();
break;
}
},
onShutdown: function () {
Services.prefs.removeObserver(JSON_VIEW_PREF, observer);
Services.obs.removeObserver(observer, "xpcom-shutdown");
},
onPrefChanged: function () {
if (this.isEnabled()) {
this.register();
} else {
this.unregister();
}
},
register: function () {
JsonViewSniffer.register();
JsonViewService.register();
},
unregister: function () {
JsonViewSniffer.unregister();
JsonViewService.unregister();
},
isEnabled: function () {
return Services.prefs.getBoolPref(JSON_VIEW_PREF);
},
};
// Listen to JSON View 'enable' pref and perform dynamic
// registration or unregistration of the main application
// component.
var observer = new ConverterObserver();
observer.initialize();
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