PrintPreview: Added code to identify the printer default duplex value.

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
    */
   function CopiesSettings() {
     this.copiesOption_ = $('copies-option');
     this.textfield_ = $('copies');
     this.incrementButton_ = $('increment');
     this.decrementButton_ = $('decrement');
     // Minimum allowed value for number of copies.
     this.minValue_ = 1;
     // Maximum allowed value for number of copies.
     this.maxValue_ = 999;
     this.collateOption_ = $('collate-option');
     this.collateCheckbox_ = $('collate');
     this.hint_ = $('copies-hint');
     this.twoSidedCheckbox_ = $('two-sided');
+    this.twoSidedOption_ = $('two-sided-div');
+
+    // Constant values matches printing::DuplexMode enum. Not using const
+    // keyword because it is not allowed by JS strict mode.
+    this.SIMPLEX = 0;
+    this.LONG_EDGE = 1;
+    this.UNKNOWN_DUPLEX_MODE = -1;
   }
 
   cr.addSingletonGetter(CopiesSettings);
 
   CopiesSettings.prototype = {
     /**
      * The number of copies represented by the contents of |this.textfield_|.
      * If the text is not valid returns |this.minValue_|.
      * @type {number}
      */
@@ skipping 14 matching lines @@
 
     /**
      * Getter method for |twoSidedCheckbox_|.
      * @type {HTMLInputElement}
      */
     get twoSidedCheckbox() {
       return this.twoSidedCheckbox_;
     },
 
     /**
-     * Gets the duplex mode for printing.
+     * Gets the duplex mode information for printing.
      * @return {number} duplex mode.
      */
-     get duplexMode() {
-      // Constant values matches printing::DuplexMode enum. Not using const
-      // keyword because it is not allowed by JS strict mode.
-      var SIMPLEX = 0;
-      var LONG_EDGE = 1;
-      return !this.twoSidedCheckbox_.checked ? SIMPLEX : LONG_EDGE;
+    get duplexMode() {
+      if (this.twoSidedOption_.hidden)
+        return this.UNKNOWN_DUPLEX_MODE;
+      else if (this.twoSidedCheckbox_.checked)
+        return this.LONG_EDGE;
+      else
+        return this.SIMPLEX;
     },
 
     /**
      * @return {boolean} true if |this.textfield_| is empty, or represents a
      *     positive integer value.
      */
     isValid: function() {
       return !this.textfield_.value || isPositiveInteger(this.textfield_.value);
     },
 
@@ skipping 73 matching lines @@
      * @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');
       }
-      this.twoSidedCheckbox_.checked = e.printerCapabilities.setDuplexAsDefault;
+      this.updateTwoSidedOption_(
+          e.printerCapabilities.printerDefaultDuplexValue);
     },
 
     /**
      * Listener triggered when |incrementButton_| is clicked.
      * @private
      */
     onIncrementButtonClicked_: function() {
       this.onButtonClicked_(1);
     },
 
@@ skipping 11 matching lines @@
      */
     showHideCollateOption_: function() {
       this.collateOption_.hidden = this.numberOfCopies <= 1;
       // TODO(aayushkumar): Remove aria-hidden attribute once elements within
       // the hidden attribute are no longer read out by a screen-reader.
       // (Currently a bug in webkit).
       this.collateOption_.setAttribute('aria-hidden',
                                        this.collateOption_.hidden);
     },
 
+    /*
+     * Takes care of showing/hiding the two sided option and also updates the
+     * default state of the checkbox.
+     * @param {number} defaultDuplexValue Specifies the default duplex value.
+     * @private
+     */
+     updateTwoSidedOption_: function(defaultDuplexValue) {
+      // On Windows, some printers don't specify their duplex values in the
+      // printer schema. If the printer duplex value is UNKNOWN_DUPLEX_MODE,
+      // hide the two sided option in preview tab UI.
+      // Ref bug: http://crbug.com/89204
+      this.twoSidedOption_.hidden =
+          (defaultDuplexValue == this.UNKNOWN_DUPLEX_MODE);
+      this.twoSidedOption_.setAttribute('aria-hidden',
+                                        this.twoSidedOption_.hidden);
+      if (!this.twoSidedOption_.hidden)
+        this.twoSidedCheckbox_.checked = !!defaultDuplexValue;
+     },
+
     /**
      * Updates the state of the increment/decrement buttons based on the current
      * |textfield_| value.
      * @private
      */
     updateButtonsState_: function() {
       if (!this.isValid()) {
         this.textfield_.classList.add('invalid');
         this.incrementButton_.disabled = false;
         this.decrementButton_.disabled = false;
         fadeInElement(this.hint_);
       } else {
         this.textfield_.classList.remove('invalid');
         this.incrementButton_.disabled = this.numberOfCopies == this.maxValue_;
         this.decrementButton_.disabled = this.numberOfCopies == this.minValue_;
         fadeOutElement(this.hint_);
       }
       this.hint_.setAttribute('aria-hidden', this.isValid());
     }
   };
 
   return {
     CopiesSettings: CopiesSettings,
   };
 });