Refactor print preview web ui

chrome/browser/resources/print_preview/settings/other_options_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';
+
+  /**
+   * UI component that renders checkboxes for various print options.
+   * @param {!print_preview.PrintTicketStore} printTicketStore Used to monitor
+   *     the state of the print ticket.
+   * @constructor
+   * @extends {print_preview.Component}
+   */
+  function OtherOptionsSettings(printTicketStore) {
+    print_preview.Component.call(this);
+
+    /**
+     * Used to monitor the state of the print ticket.
+     * @type {!print_preview.PrintTicketStore}
+     * @private
+     */
+    this.printTicketStore_ = printTicketStore;
+
+    /**
+     * Header footer container element.
+     * @type {HTMLElement}
+     * @private
+     */
+    this.headerFooterEl_ = null;
+
+    /**
+     * Header footer checkbox.
+     * @type {HTMLInputElement}
+     * @private
+     */
+    this.headerFooterCheckbox_ = null;
+
+    /**
+     * Fit-to-page container element.
+     * @type {HTMLElement}
+     * @private
+     */
+    this.fitToPageEl_ = null;
+
+    /**
+     * Fit-to-page checkbox.
+     * @type {HTMLInputElement}
+     * @private
+     */
+    this.fitToPageCheckbox_ = null;
+  };
+
+  /**
+   * CSS classes used by the other options component.
+   * @enum {string}
+   * @private
+   */
+  OtherOptionsSettings.Classes_ = {
+    FIT_TO_PAGE: 'other-options-settings-fit-to-page',
+    FIT_TO_PAGE_CHECKBOX: 'other-options-settings-fit-to-page-checkbox',
+    HEADER_FOOTER: 'other-options-settings-header-footer',
+    HEADER_FOOTER_CHECKBOX: 'other-options-settings-header-footer-checkbox'
+  };
+
+  OtherOptionsSettings.prototype = {
+    __proto__: print_preview.Component.prototype,
+
+    set isEnabled(isEnabled) {
+      this.headerFooterCheckbox_.disabled = !isEnabled;
+      this.fitToPageCheckbox_.disabled = !isEnabled;
+    },
+
+    /** @override */
+    enterDocument: function() {
+      print_preview.Component.prototype.enterDocument.call(this);
+      this.tracker.add(
+          this.headerFooterCheckbox_,
+          'click',
+          this.onHeaderFooterCheckboxClick_.bind(this));
+      this.tracker.add(
+          this.fitToPageCheckbox_,
+          'click',
+          this.onFitToPageCheckboxClick_.bind(this));
+      this.tracker.add(
+          this.printTicketStore_,
+          print_preview.PrintTicketStore.EventType.INITIALIZE,
+          this.onPrintTicketStoreChange_.bind(this));
+      this.tracker.add(
+          this.printTicketStore_,
+          print_preview.PrintTicketStore.EventType.DOCUMENT_CHANGE,
+          this.onPrintTicketStoreChange_.bind(this));
+      this.tracker.add(
+          this.printTicketStore_,
+          print_preview.PrintTicketStore.EventType.CAPABILITIES_CHANGE,
+          this.onPrintTicketStoreChange_.bind(this));
+      this.tracker.add(
+          this.printTicketStore_,
+          print_preview.PrintTicketStore.EventType.TICKET_CHANGE,
+          this.onPrintTicketStoreChange_.bind(this));
+    },
+
+    /** @override */
+    exitDocument: function() {
+      print_preview.Component.prototype.exitDocument.call(this);
+      this.headerFooterEl_ = null;
+      this.headerFooterCheckbox_ = null;
+      this.fitToPageEl_ = null;
+      this.fitToPageCheckbox_ = null;
+    },
+
+    /** @override */
+    decorateInternal: function() {
+      this.headerFooterEl_ = this.getElement().getElementsByClassName(
+          OtherOptionsSettings.Classes_.HEADER_FOOTER)[0];
+      this.headerFooterCheckbox_ = this.getElement().getElementsByClassName(
+          OtherOptionsSettings.Classes_.HEADER_FOOTER_CHECKBOX)[0];
+      this.fitToPageEl_ = this.getElement().getElementsByClassName(
+          OtherOptionsSettings.Classes_.FIT_TO_PAGE)[0];
+      this.fitToPageCheckbox_ = this.getElement().getElementsByClassName(
+          OtherOptionsSettings.Classes_.FIT_TO_PAGE_CHECKBOX)[0];
+    },
+
+    /**
+     * Called when the header-footer checkbox is clicked. Updates the print
+     * ticket.
+     * @private
+     */
+    onHeaderFooterCheckboxClick_: function() {
+      this.printTicketStore_.updateHeaderFooter(
+          this.headerFooterCheckbox_.checked);
+    },
+
+    /**
+     * Called when the fit-to-page checkbox is clicked. Updates the print
+     * ticket.
+     * @private
+     */
+    onFitToPageCheckboxClick_: function() {
+      this.printTicketStore_.updateFitToPage(
+          this.fitToPageCheckbox_.checked);
+    },
+
+    /**
+     * Called when the print ticket store has changed. Hides or shows the
+     * setting.
+     * @private
+     */
+    onPrintTicketStoreChange_: function() {
+      setIsVisible(
+          this.headerFooterEl_,
+          this.printTicketStore_.hasHeaderFooterCapability());
+      this.headerFooterCheckbox_.checked =
+            this.printTicketStore_.isHeaderFooterEnabled();
+      setIsVisible(
+          this.fitToPageEl_, this.printTicketStore_.hasFitToPageCapability());

[kmadhusu, 2012/05/18 20:13:46]

nit: First argument can fit in the first line. Please refer to the function
arguments section in
http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml#Nested_....

+      this.fitToPageCheckbox_.checked =
+          this.printTicketStore_.isFitToPageEnabled();
+
+      if (this.printTicketStore_.hasHeaderFooterCapability() ||
+          this.printTicketStore_.hasFitToPageCapability()) {
+        fadeInOption(this.getElement());
+      } else {
+        fadeOutOption(this.getElement());
+      }
+    }
+  };
+
+  // Export
+  return {
+    OtherOptionsSettings: OtherOptionsSettings
+  };
+});