keyboard events legit

src/js/util/keyboard.js

@@ -0,0 +1,45 @@
+var _ = require('underscore');
+var Backbone = require('backbone');
+
+function KeyboardListener(options) {
+  this.events = options.events || _.clone(Backbone.Events);
+  this.aliasMap = options.aliasMap || {};
+
+  this.keyMap = {
+    37: 'left',
+    38: 'up',
+    39: 'right',
+    40: 'down',
+    27: 'esc',
+    13: 'enter'
+  };
+  this.keydownListener = _.bind(this.keydown, this);
+
+  this.listen();
+}
+
+KeyboardListener.prototype.listen = function() {
+  $(document).bind('keydown', this.keydownListener);
+};
+
+KeyboardListener.prototype.mute = function() {
+  $(document).unbind('keydown', this.keydownListener);
+};
+
+KeyboardListener.prototype.keydown = function(e) {
+  var which = e.which;
+  console.log('key which', which);
+
+  if (this.keyMap[which] === undefined) {
+    return;
+  }
+  this.fireEvent(this.keyMap[which]);
+};
+
+KeyboardListener.prototype.fireEvent = function(eventName) {
+  eventName = this.aliasMap[eventName] || eventName;
+  this.events.trigger(eventName);
+};
+
+exports.KeyboardListener = KeyboardListener;
+