Export vendor capabilities to the CJT ticket.

chrome/browser/resources/print_preview/data/ticket_items/vendor_items.js

+// Copyright 2014 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.ticket_items', function() {
+  'use strict';
+
+  /**
+   * An object that represents a user modifiable item in a print ticket. Each
+   * ticket item has a value which can be set by the user. Ticket items can also
+   * be unavailable for modifying if the print destination doesn't support it or
+   * if other ticket item constraints are not met.
+   * @param {print_preview.AppState} appState Application state model to update
+   *     when ticket items update.
+   * @param {print_preview.DestinationStore} destinationStore Used listen for
+   *     changes in the currently selected destination's capabilities. Since
+   *     this is a common dependency of ticket items, it's handled in the base
+   *     class.
+   * @constructor
+   * @extends {cr.EventTarget}
+   */
+  function VendorItems(appState, destinationStore) {
+    cr.EventTarget.call(this);
+
+    /**
+     * Application state model to update when ticket items update.
+     * @private {print_preview.AppState}
+     */
+    this.appState_ = appState || null;
+
+    /**
+     * Used listen for changes in the currently selected destination's
+     * capabilities.
+     * @private {print_preview.DestinationStore}
+     */
+    this.destinationStore_ = destinationStore || null;
+
+    /**
+     * Vendor ticket items store, maps item id to the item value.
+     * @private {!Object.<string, string>}
+     */
+    this.items_ = {};
+  };
+
+  VendorItems.prototype = {
+    __proto__: cr.EventTarget.prototype,
+
+    /** @return {boolean} Whether vendor capabilities are available. */
+    isCapabilityAvailable: function() {
+      return !!this.capability;
+    },
+
+    /** @return {boolean} Whether the ticket item was modified by the user. */
+    isUserEdited: function() {
+      // If there's at least one ticket item stored in values, it was edited.
+      for (var key in values) {
+        if (values.hasOwnProperty(key))
+          return true;
+      }
+      return false;
+    },
+
+    /** @return {Object} Media size capability of the selected destination. */
+    get capability() {
+      var destination = this.destinationStore_ ?
+          this.destinationStore_.selectedDestination : null;
+      return (destination &&
+              destination.capabilities &&
+              destination.capabilities.printer &&
+              destination.capabilities.printer.vendor_capability) ||
+             null;
+    },
+
+    /**
+     * Vendor ticket items store, maps item id to the item value.
+     * @return {!Object.<string, string>}
+     */
+    get ticketItems() {
+      return this.items_;
+    },
+
+    /**
+     * @param {!Object.<string, string>} values Values to set as the values of
+     *     vendor ticket items. Maps vendor item id to the value.
+     */
+    updateValue: function(values) {
+      this.items_ = {};
+      if (typeof values == 'object') {
+        for (var key in values) {
+          if (values.hasOwnProperty(key) && typeof values[key] == 'string') {
+            // Let's empirically limit each value at 2K.
+            this.items_[key] = values[key].substring(0, 2048);
+          }
+        }
+      }
+
+      if (this.appState_) {
+        this.appState_.persistField(
+            print_preview.AppState.Field.VENDOR_OPTIONS, this.items_);
+      }
+    }
+  };
+
+  // Export
+  return {
+    VendorItems: VendorItems
+  };
+});