chrome/browser/resources/print_preview/data/margins.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 cr.define('print_preview', function() {
   6   'use strict';
   7
   8   /**
   9    * Creates a Margins object that holds four margin values in points.
  10    * @param {number} top The top margin in pts.
  11    * @param {number} right The right margin in pts.
  12    * @param {number} bottom The bottom margin in pts.
  13    * @param {number} left The left margin in pts.
  14    * @constructor
  15    */
  16   function Margins(top, right, bottom, left) {
  17     /**
  18      * Backing store for the margin values in points.
  19      * @type {!Object.<
  20      *     !print_preview.ticket_items.CustomMargins.Orientation, number>}
  21      * @private
  22      */
  23     this.value_ = {};
  24     this.value_[print_preview.ticket_items.CustomMargins.Orientation.TOP] = top;
  25     this.value_[print_preview.ticket_items.CustomMargins.Orientation.RIGHT] =
  26         right;
  27     this.value_[print_preview.ticket_items.CustomMargins.Orientation.BOTTOM] =
  28         bottom;
  29     this.value_[print_preview.ticket_items.CustomMargins.Orientation.LEFT] =
  30         left;
  31   };
  32
  33   /**
  34    * Parses a margins object from the given serialized state.
  35    * @param {Object} state Serialized representation of the margins created by
  36    *     the {@code serialize} method.
  37    * @return {!print_preview.Margins} New margins instance.
  38    */
  39   Margins.parse = function(state) {
  40     return new print_preview.Margins(
  41         state[print_preview.ticket_items.CustomMargins.Orientation.TOP] || 0,
  42         state[print_preview.ticket_items.CustomMargins.Orientation.RIGHT] || 0,
  43         state[print_preview.ticket_items.CustomMargins.Orientation.BOTTOM] || 0,
  44         state[print_preview.ticket_items.CustomMargins.Orientation.LEFT] || 0);
  45   };
  46
  47   Margins.prototype = {
  48     /**
  49      * @param {!print_preview.ticket_items.CustomMargins.Orientation}
  50      *     orientation Specifies the margin value to get.
  51      * @return {number} Value of the margin of the given orientation.
  52      */
  53     get: function(orientation) {
  54       return this.value_[orientation];
  55     },
  56
  57     /**
  58      * @param {!print_preview.ticket_items.CustomMargins.Orientation}
  59      *     orientation Specifies the margin to set.
  60      * @param {number} value Updated value of the margin in points to modify.
  61      * @return {!print_preview.Margins} A new copy of |this| with the
  62      *     modification made to the specified margin.
  63      */
  64     set: function(orientation, value) {
  65       var newValue = this.clone_();
  66       newValue[orientation] = value;
  67       return new Margins(
  68           newValue[print_preview.ticket_items.CustomMargins.Orientation.TOP],
  69           newValue[print_preview.ticket_items.CustomMargins.Orientation.RIGHT],
  70           newValue[print_preview.ticket_items.CustomMargins.Orientation.BOTTOM],
  71           newValue[print_preview.ticket_items.CustomMargins.Orientation.LEFT]);
  72     },
  73
  74     /**
  75      * @param {print_preview.Margins} other The other margins object to compare
  76      *     against.
  77      * @return {boolean} Whether this margins object is equal to another.
  78      */
  79     equals: function(other) {
  80       if (other == null) {
  81         return false;
  82       }
  83       for (var orientation in this.value_) {
  84         if (this.value_[orientation] != other.value_[orientation]) {
  85           return false;
  86         }
  87       }
  88       return true;
  89     },
  90
  91     /** @return {Object} A serialized representation of the margins. */
  92     serialize: function() {
  93       return this.clone_();
  94     },
  95
  96     /**
  97      * @return {Object} Cloned state of the margins.
  98      * @private
  99      */
 100     clone_: function() {
 101       var clone = {};
 102       for (var o in this.value_) {
 103         clone[o] = this.value_[o];
 104       }
 105       return clone;
 106     }
 107   };
 108
 109   // Export
 110   return {
 111     Margins: Margins
 112   };
 113 });