Print Preview: Hiding header/footer options when 'no margins' is selected

chrome/browser/resources/print_preview/margin_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 Margins object that holds four margin values. The units in which
    * the values are expressed can be any numeric value.
@@ skipping 544 matching lines @@
      * Executes when user selects a different margin option, ie,
      * |this.marginList_.selectedIndex| is changed.
      * @private
      */
     onMarginsChanged_: function() {
       if (this.isDefaultMarginsSelected() || this.isMinimumMarginsSelected() ||
           this.isNoMarginsSelected())
         this.onDefaultMinimumNoMarginsSelected_();
       else if (this.isCustomMarginsSelected())
         this.onCustomMarginsSelected_();
+
+      var customEvent = cr.Event(customEvents.MARGINS_SELECTION_CHANGED);
+      customEvent.selectedMargins = this.selectedMarginsValue;
+      document.dispatchEvent(customEvent);
     },
 
     /**
      * Executes when the default or minimum or no margins option is selected.
      * @private
      */
     onDefaultMinimumNoMarginsSelected_: function() {
       this.removeCustomMarginEventListeners_();
       this.forceDisplayingMarginLines_ = true;
       this.previousCustomMargins_ = null;
@@ skipping 114 matching lines @@
       this.pageWidth_ = this.currentDefaultPageLayout.pageWidth;
       this.pageHeight_ = this.currentDefaultPageLayout.pageHeight;
     }
   };
 
   return {
     MarginSettings: MarginSettings,
     PageLayout: PageLayout,
   };
 });