Refactor print preview web ui

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

+// Copyright (c) 2012 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';
+
+  // TODO This class needs a throbber while loading the destination.
+
+  /**
+   * Component used to render the print destination.
+   *
+   * The component dispatches a CHANGE event when it's "Change" button is
+   * clicked.
+   *
+   * @param {!print_preview.DestinationStore} destinationStore Used to determine
+   *     the selected destination.
+   * @constructor
+   * @extends {print_preview.Component}
+   */
+  function DestinationSettings(destinationStore) {
+    print_preview.Component.call(this);
+
+    /**
+     * Used to determine the selected destination.
+     * @type {!print_preview.DestinationStore}
+     * @private
+     */
+    this.destinationStore_ = destinationStore;
+  };
+
+  /**
+   * Enumeration of events the component dispatches.
+   * @enum {string}
+   */
+  DestinationSettings.Event = {
+    MANAGE_PRINTERS_SELECT:
+        'print_preview.DestinationSettings.MANAGE_PRINTERS_SELECT'
+  };
+
+  /**
+   * CSS classes used by the component.
+   * @enum {string}
+   * @private
+   */
+  DestinationSettings.Classes_ = {
+    SELECT: 'destination-settings-select'
+  };
+
+  /**
+   * Option value of the "Manage Printers..." select option.
+   * @type {string}
+   * @const
+   * @private
+   */
+  DestinationSettings.MANAGE_ID_ = '__manage';
+
+  DestinationSettings.prototype = {
+    __proto__: print_preview.Component.prototype,
+
+    set isEnabled(isEnabled) {
+      this.select_.disabled = !isEnabled;
+    },
+
+    /** @override */
+    enterDocument: function() {
+      print_preview.Component.prototype.enterDocument.call(this);
+      this.tracker.add(
+          this.select_, 'change', this.onSelectChange_.bind(this));
+      this.tracker.add(
+          this.destinationStore_,
+          print_preview.DestinationStore.Event.DESTINATION_SELECT,
+          this.onDestinationSelect_.bind(this));
+      this.tracker.add(
+          this.destinationStore_,
+          print_preview.DestinationStore.Event.DESTINATIONS_INSERTED,
+          this.onDestinationsInserted_.bind(this));
+    },
+
+    get select_() {
+      return this.getElement().getElementsByClassName(
+          DestinationSettings.Classes_.SELECT)[0];
+    },
+
+    renderDestinations_: function() {
+      var select = this.select_;
+      select.innerHTML = '';
+      var destinations = this.destinationStore_.destinations;
+      var selectedDestination = this.destinationStore_.selectedDestination;
+      var printToPdfDest = null;
+      var printWithCloudPrintDest = null;
+      for (var dest, i = 0; dest = destinations[i]; i++) {
+        if (dest.isPrintToPdf) {
+          printToPdfDest = dest;
+          continue;
+        }
+        if (dest.isPrintWithCloudPrint) {
+          printWithCloudPrintDest = dest;
+          continue;
+        }
+        var optionEl = document.createElement('option');
+        optionEl.value = dest.id;
+        optionEl.selected =
+            selectedDestination && selectedDestination.id == dest.id;
+        optionEl.textContent = dest.displayName;
+        select.appendChild(optionEl);
+      }
+
+      // Add special destinations.
+      if (printToPdfDest) {
+        select.appendChild(this.createSeparatorOption_());
+        var printToPdfOptionEl = document.createElement('option');
+        printToPdfOptionEl.value = printToPdfDest.id;
+        printToPdfOptionEl.selected =
+            selectedDestination && selectedDestination.id == printToPdfDest.id;
+        printToPdfOptionEl.textContent = printToPdfDest.displayName;
+        select.appendChild(printToPdfOptionEl);
+      }
+      if (printWithCloudPrintDest) {
+        select.appendChild(this.createSeparatorOption_());
+        var printWithCloudPrintOptionEl = document.createElement('option');
+        printWithCloudPrintOptionEl.value = printWithCloudPrintDest.id;
+        printWithCloudPrintOptionEl.selected =
+            selectedDestination &&
+            selectedDestination.id == printWithCloudPrintDest.id;
+        printWithCloudPrintOptionEl.textContent =
+            printWithCloudPrintDest.displayName;
+        select.appendChild(printWithCloudPrintOptionEl);
+      }
+      select.appendChild(this.createSeparatorOption_());
+      var manageOptionEl = document.createElement('option');
+      manageOptionEl.value = DestinationSettings.MANAGE_ID_;
+      manageOptionEl.textContent = localStrings.getString('managePrinters');
+      select.appendChild(manageOptionEl);
+    },
+
+    createSeparatorOption_: function() {
+      var sep = document.createElement('option');
+      sep.disabled = true;
+      sep.role = 'separator';
+      return sep;
+    },
+
+    /**
+     * Called when a destination is selected. Selects the corresponding option.
+     * @private
+     */
+    onDestinationSelect_: function() {
+      var select = this.select_;
+      if (select.options.length > 0) {
+        select.options[select.selectedIndex].selected = false;
+      }
+      var selectedDestination = this.destinationStore_.selectedDestination;
+      for (var option, i = 0; option = select.options[i]; i++) {
+        if (selectedDestination.id == option.value) {
+          option.selected = true;
+          break;
+        }
+      }
+    },
+
+    /**
+     * Called when destinations are inserted into the destination store. Updates
+     * the select element.
+     * @private
+     */
+    onDestinationsInserted_: function() {
+      this.renderDestinations_();
+    },
+
+    /**
+     * Called when the select element changes options. Selects the corresponding
+     * print destination.
+     * @private
+     */
+    onSelectChange_: function() {
+      var select = this.select_;
+      var selectedDestId = select.options[select.selectedIndex].value;
+
+      if (selectedDestId == DestinationSettings.MANAGE_ID_) {
+        cr.dispatchSimpleEvent(
+            this, DestinationSettings.Event.MANAGE_PRINTERS_SELECT);
+      } else {
+        var destinations = this.destinationStore_.destinations;
+        for (var dest, i = 0; dest = destinations[i]; i++) {
+          if (dest.id == selectedDestId) {
+            this.destinationStore_.selectDestination(dest);
+            break;
+          }
+        }
+      }
+    }
+  };
+
+  return {
+    DestinationSettings: DestinationSettings
+  };
+});