chrome/browser/resources/print_preview/settings/margin_settings.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 cr.define('print_preview', function() {
   6   'use strict';
   7
   8   /**
   9    * Creates a MarginSettings object. This object encapsulates all settings and
  10    * logic related to the margins mode.
  11    * @param {!print_preview.ticket_items.MarginsType} marginsTypeTicketItem Used
  12    *     to read and write the margins type ticket item.
  13    * @constructor
  14    * @extends {print_preview.SettingsSection}
  15    */
  16   function MarginSettings(marginsTypeTicketItem) {
  17     print_preview.SettingsSection.call(this);
  18
  19     /**
  20      * Used to read and write the margins type ticket item.
  21      * @type {!print_preview.ticket_items.MarginsType}
  22      * @private
  23      */
  24     this.marginsTypeTicketItem_ = marginsTypeTicketItem;
  25   };
  26
  27   /**
  28    * CSS classes used by the margin settings component.
  29    * @enum {string}
  30    * @private
  31    */
  32   MarginSettings.Classes_ = {
  33     SELECT: 'margin-settings-select'
  34   };
  35
  36   MarginSettings.prototype = {
  37     __proto__: print_preview.SettingsSection.prototype,
  38
  39     /** @override */
  40     isAvailable: function() {
  41       return this.marginsTypeTicketItem_.isCapabilityAvailable();
  42     },
  43
  44     /** @override */
  45     hasCollapsibleContent: function() {
  46       return this.isAvailable();
  47     },
  48
  49     /** @override */
  50     set isEnabled(isEnabled) {
  51       this.select_.disabled = !isEnabled;
  52     },
  53
  54     /** @override */
  55     enterDocument: function() {
  56       print_preview.SettingsSection.prototype.enterDocument.call(this);
  57       this.tracker.add(
  58           this.select_, 'change', this.onSelectChange_.bind(this));
  59       this.tracker.add(
  60           this.marginsTypeTicketItem_,
  61           print_preview.ticket_items.TicketItem.EventType.CHANGE,
  62           this.onMarginsTypeTicketItemChange_.bind(this));
  63     },
  64
  65     /**
  66      * @return {HTMLSelectElement} Select element containing the margin options.
  67      * @private
  68      */
  69     get select_() {
  70       return this.getElement().getElementsByClassName(
  71           MarginSettings.Classes_.SELECT)[0];
  72     },
  73
  74     /**
  75      * Called when the select element is changed. Updates the print ticket
  76      * margin type.
  77      * @private
  78      */
  79     onSelectChange_: function() {
  80       var select = this.select_;
  81       var marginsType =
  82           /** @type {!print_preview.ticket_items.MarginsType.Value} */ (
  83               select.selectedIndex);
  84       this.marginsTypeTicketItem_.updateValue(marginsType);
  85     },
  86
  87     /**
  88      * Called when the print ticket store changes. Selects the corresponding
  89      * select option.
  90      * @private
  91      */
  92     onMarginsTypeTicketItemChange_: function() {
  93       if (this.isAvailable()) {
  94         var select = this.select_;
  95         var marginsType = this.marginsTypeTicketItem_.getValue();
  96         var selectedMarginsType =
  97             /** @type {!print_preview.ticket_items.MarginsType.Value} */ (
  98                 select.selectedIndex);
  99         if (marginsType != selectedMarginsType) {
 100           select.options[selectedMarginsType].selected = false;
 101           select.options[marginsType].selected = true;
 102         }
 103       }
 104       this.updateUiStateInternal();
 105     }
 106   };
 107
 108   // Export
 109   return {
 110     MarginSettings: MarginSettings
 111   };
 112 });