Refactor print preview web ui

chrome/browser/resources/print_preview/data/ticket_items/header_footer.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.ticket_items', function() {
+  'use strict';
+
+  /**
+   * Header-footer ticket item whose value is a {@code boolean} that indicates
+   * whether the document should be printed with headers and footers.
+   * @param {!print_preview.DocumentInfo} documentInfo Information about the
+   *     document to print.
+   * @param {!print_preview.ticket_items.MarginsType} marginsType Ticket item
+   *     that stores which predefined margins to print with.
+   * @param {!print_preview.ticket_items.CustomMargins} customMargins Ticket
+   *     item that stores custom margin values.
+   * @constructor
+   * @extends {print_preview.ticket_items.TicketItem}
+   */
+  function HeaderFooter(documentInfo, marginsType, customMargins) {
+    print_preview.ticket_items.TicketItem.call(this);
+
+    /**
+     * Information about the document to print.
+     * @type {!print_preview.DocumentInfo}
+     * @private
+     */
+    this.documentInfo_ = documentInfo;
+
+    /**
+     * Ticket item that stores which predefined margins to print with.
+     * @type {!print_preview.ticket_items.MarginsType}
+     * @private
+     */
+    this.marginsType_ = marginsType;
+
+    /**
+     * Ticket item that stores custom margin values.
+     * @type {!print_preview.ticket_items.CustomMargins}
+     * @private
+     */
+    this.customMargins_ = customMargins;
+  };
+
+  /**
+   * Minimum value of a top or bottom margin that can fit a header and footer.
+   * @type {number}
+   * @const
+   * @private
+   */
+  HeaderFooter.MIN_MARGIN_SIZE_ = 72.0 / 2.0; // Half inch.
+
+  HeaderFooter.prototype = {
+    __proto__: print_preview.ticket_items.TicketItem.prototype,
+
+    /** @override */
+    wouldValueBeValid: function(value) {
+      return true;
+    },
+
+    /** @override */
+    isCapabilityAvailable: function() {
+      if (!this.documentInfo_.isModifiable ||
+          this.marginsType_.getValue() ==
+              print_preview.ticket_items.MarginsType.Value.NO_MARGINS) {
+        return false;
+      }
+      if (this.marginsType_.getValue() ==
+              print_preview.ticket_items.MarginsType.Value.CUSTOM) {
+        if (!this.customMargins_.isValid()) {
+          return false;
+        }
+        var marginsInPts = this.customMargins_.getValueInPts();
+        var orientEnum = print_preview.ticket_items.CustomMargins.Orientation;
+        if (marginsInPts.get(orientEnum.TOP) < HeaderFooter.MIN_MARGIN_SIZE_ &&
+            marginsInPts.get(orientEnum.BOTTOM) <
+                HeaderFooter.MIN_MARGIN_SIZE_) {
+          return false;
+        }
+      }
+      return true;
+    },
+
+    /** @override */
+    getDefaultValueInternal: function() {
+      return true;
+    },
+
+    /** @override */
+    getCapabilityNotAvailableValueInternal: function() {
+      return false;
+    }
+  };
+
+  // Export
+  return {
+    HeaderFooter: HeaderFooter
+  };
+});