P5-1922 fix jslint warnings

src/TextButton.js

@@ -1,13 +1,18 @@
 'use strict';
+/* globals $, fabric */
 
 var config = require('./config');
 
 /**
  * Creates a text-button with text/settings provided.
- * @param {String} text - text to be shown inside the button
+ * @param {string} id
+ * @param {string} text - text to be shown inside the button
  * @param {Object} settings
+ * @param {bool} isActive
  */
 function TextButton(id, text, settings, isActive) {
+    /* jshint unused:false */
+
     fabric.Group.call(this);
 
     var __active = isActive || false;
@@ -65,7 +70,15 @@ function TextButton(id, text, settings, isActive) {
         return this.__active;
     };
 
+    function toggleActiveStyle() {
+        /*jshint validthis: true */
+        _rect.setFill(_rectSettings[this.isActive() ? 'activeFill' : 'fill']);
+        _text.setFill(_textSettings[this.isActive() ? 'activeFill' : 'fill']);
+        this.setText(_textSettings[this.isActive() ? 'textActive' : 'text']);
+    }
+
     function handleMouseDown(e) {
+        /*jshint validthis: true */
         toggleActiveStyle.call(this);
         _callback.call(this, e);
 
@@ -74,12 +87,6 @@ function TextButton(id, text, settings, isActive) {
         }
     }
 
-    function toggleActiveStyle() {
-        _rect.setFill(_rectSettings[this.isActive() ? 'activeFill' : 'fill']);
-        _text.setFill(_textSettings[this.isActive() ? 'activeFill' : 'fill']);
-        this.setText(_textSettings[this.isActive() ? 'textActive' : 'text']);
-    }
-
     this.onClick = function(callback) {
         _callback = callback || function() {};
         this.on('mousedown', function (e) {