1 files changed, 40 insertions, 0 deletions
diff --git a/addon-sdk/source/lib/sdk/hotkeys.js b/addon-sdk/source/lib/sdk/hotkeys.js
new file mode 100644
index 000000000..00081455e
--- /dev/null
+++ b/addon-sdk/source/lib/sdk/hotkeys.js
@@ -0,0 +1,40 @@
+/* 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";
+
+module.metadata = {
+  "stability": "stable"
+};
+
+const INVALID_HOTKEY = "Hotkey must have at least one modifier.";
+
+const { toJSON: jsonify, toString: stringify,
+        isFunctionKey } = require("./keyboard/utils");
+const { register, unregister } = require("./keyboard/hotkeys");
+
+const Hotkey = exports.Hotkey = function Hotkey(options) {
+  if (!(this instanceof Hotkey))
+    return new Hotkey(options);
+
+  // Parsing key combination string.
+  let hotkey = jsonify(options.combo);
+  if (!isFunctionKey(hotkey.key) && !hotkey.modifiers.length) {
+    throw new TypeError(INVALID_HOTKEY);
+  }
+
+  this.onPress = options.onPress && options.onPress.bind(this);
+  this.toString = stringify.bind(null, hotkey);
+  // Registering listener on keyboard combination enclosed by this hotkey.
+  // Please note that `this.toString()` is a normalized version of
+  // `options.combination` where order of modifiers is sorted and `accel` is
+  // replaced with platform specific key.
+  register(this.toString(), this.onPress);
+  // We freeze instance before returning it in order to make it's properties
+  // read-only.
+  return Object.freeze(this);
+};
+Hotkey.prototype.destroy = function destroy() {
+  unregister(this.toString(), this.onPress);
+};