Refactor print preview web ui

chrome/browser/resources/print_preview/data/margins.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';
+
+  /**
+   * Creates a Margins object that holds four margin values in points.
+   * @param {number} top The top margin in pts.
+   * @param {number} right The right margin in pts.
+   * @param {number} bottom The bottom margin in pts.
+   * @param {number} left The left margin in pts.
+   * @constructor
+   */
+  function Margins(top, right, bottom, left) {
+    /**
+     * Backing store for the margin values in points.
+     * @type {Object.<
+     *     print_preview.ticket_items.CustomMargins.Orientation,
+     *     number>}
+     * @private
+     */
+    this.value_ = {};
+    this.value_[print_preview.ticket_items.CustomMargins.Orientation.TOP] = top;
+    this.value_[print_preview.ticket_items.CustomMargins.Orientation.RIGHT] =
+        right;
+    this.value_[print_preview.ticket_items.CustomMargins.Orientation.BOTTOM] =
+        bottom;
+    this.value_[print_preview.ticket_items.CustomMargins.Orientation.LEFT] =
+        left;
+  };
+
+  Margins.prototype = {
+    /**
+     * @param {print_preview.ticket_items.CustomMargins.Orientation} orientation
+     *     Specifies the margin value to get.
+     * @return {number} Value of the margin of the given orientation.
+     */
+    get: function(orientation) {
+      return this.value_[orientation];
+    },
+
+    /**
+     * @param {print_preview.ticket_items.CustomMargins.Orientation} orientation
+     *     Specifies the margin to set.
+     * @param {number} value Updated value of the margin in points to modify.
+     * @return {!print_preview.Margins} A new copy of |this| with the
+     *     modification made to the specified margin.
+     */
+    set: function(orientation, value) {
+      var newValue = {};
+      for (var o in this.value_) {
+        newValue[o] = this.value_[o];
+      }
+      newValue[orientation] = value;
+      return new Margins(
+          newValue[print_preview.ticket_items.CustomMargins.Orientation.TOP],
+          newValue[print_preview.ticket_items.CustomMargins.Orientation.RIGHT],
+          newValue[print_preview.ticket_items.CustomMargins.Orientation.BOTTOM],
+          newValue[print_preview.ticket_items.CustomMargins.Orientation.LEFT]);
+    },
+
+    /**
+     * @param {print_preview.Margins} other The other margins object to compare
+     *     against.
+     * @return {boolean} Whether this margins object is equal to another.
+     */
+    equals: function(other) {
+      if (other == null) {
+        return false;
+      }
+      for (var orientation in this.value_) {
+        if (this.value_[orientation] != other.value_[orientation]) {
+          return false;
+        }
+      }
+      return true;
+    }
+  };
+
+  // Export
+  return {
+    Margins: Margins
+  };
+});