Print Preview Cleanup: Creating enum with all custom events used.

chrome/browser/resources/print_preview/copies_settings.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Creates a CopiesSettings object.
    * @constructor
@@ skipping 100 matching lines @@
       if (!this.isValid()) {
         this.reset_();
       } else {
         var newValue = this.numberOfCopies + sign;
         this.textfield_.value = newValue;
       }
       this.updateButtonsState_();
       this.showHideCollateOption_();
 
       if (!hasPendingPreviewRequest) {
-        cr.dispatchSimpleEvent(document, 'updateSummary');
-        cr.dispatchSimpleEvent(document, 'updatePrintButton');
+        cr.dispatchSimpleEvent(document, customEvents.UPDATE_SUMMARY);
+        cr.dispatchSimpleEvent(document, customEvents.UPDATE_PRINT_BUTTON);
       }
     },
 
     /**
      * Listener function to execute whenever a change occurs in |textfield_|
      * textfield.
      * @private
      */
     onTextfieldChanged_: function() {
       this.updateButtonsState_();
       this.showHideCollateOption_();
       if (!hasPendingPreviewRequest) {
-        cr.dispatchSimpleEvent(document, 'updateSummary');
-        cr.dispatchSimpleEvent(document, 'updatePrintButton');
+        cr.dispatchSimpleEvent(document, customEvents.UPDATE_SUMMARY);
+        cr.dispatchSimpleEvent(document, customEvents.UPDATE_PRINT_BUTTON);
       }
     },
 
     /**
      * Adding listeners to all copies related controls. The listeners take care
      * of altering their behavior depending on |hasPendingPreviewRequest|.
      * @private
      */
     addEventListeners_: function() {
       this.textfield_.oninput = this.onTextfieldChanged_.bind(this);
       this.incrementButton_.onclick = this.onIncrementButtonClicked_.bind(this);
       this.decrementButton_.onclick = this.onDecrementButtonClicked_.bind(this);
       this.twoSidedCheckbox_.onclick = function() {
         if (!hasPendingPreviewRequest)
-          cr.dispatchSimpleEvent(document, 'updateSummary');
+          cr.dispatchSimpleEvent(document, customEvents.UPDATE_SUMMARY);
       }
-      document.addEventListener('PDFLoaded',
+      document.addEventListener(customEvents.PDF_LOADED,
                                 this.updateButtonsState_.bind(this));
-      document.addEventListener('printerCapabilitiesUpdated',
+      document.addEventListener(customEvents.PRINTER_CAPABILITIES_UPDATED,
                                 this.onPrinterCapabilitiesUpdated_.bind(this));
     },
 
     /**
-     * Listener triggered when a printerCapabilitiesUpdated event occurs.
+     * Executes when a |customEvents.PRINTER_CAPABILITIES_UPDATED| event occurs.
      * @private
      */
     onPrinterCapabilitiesUpdated_: function(e) {
       if (e.printerCapabilities.disableCopiesOption) {
         fadeOutElement(this.copiesOption_);
         $('hr-before-copies').classList.remove('invisible');
       } else {
         fadeInElement(this.copiesOption_);
         $('hr-before-copies').classList.add('invisible');
       }
@@ skipping 67 matching lines @@
         fadeOutElement(this.hint_);
       }
       this.hint_.setAttribute('aria-hidden', this.isValid());
     }
   };
 
   return {
     CopiesSettings: CopiesSettings,
   };
 });