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Diffstat (limited to 'toolkit/devtools/styleeditor/utils.js')
-rw-r--r-- | toolkit/devtools/styleeditor/utils.js | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/toolkit/devtools/styleeditor/utils.js b/toolkit/devtools/styleeditor/utils.js new file mode 100644 index 000000000..e90e252d8 --- /dev/null +++ b/toolkit/devtools/styleeditor/utils.js @@ -0,0 +1,40 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ +/* vim: set ft=javascript ts=2 et sw=2 tw=80: */ +/* 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/. */ + +const {Cc, Ci, Cu, Cr} = require("chrome"); + +Cu.import("resource://gre/modules/Services.jsm"); +Cu.import("resource://gre/modules/devtools/event-emitter.js"); + +exports.PREF_ORIG_SOURCES = "devtools.styleeditor.source-maps-enabled"; + +/** + * A PreferenceObserver observes a pref branch for pref changes. + * It emits an event for each preference change. + */ +function PrefObserver(branchName) { + this.branchName = branchName; + this.branch = Services.prefs.getBranch(branchName); + this.branch.addObserver("", this, false); + + EventEmitter.decorate(this); +} + +exports.PrefObserver = PrefObserver; + +PrefObserver.prototype = { + observe: function(subject, topic, data) { + if (topic == "nsPref:changed") { + this.emit(this.branchName + data); + } + }, + + destroy: function() { + if (this.branch) { + this.branch.removeObserver('', this); + } + } +};
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