chrome/browser/resources/print_preview/data/ticket_items/custom_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.ticket_items', function() {
   6   'use strict';
   7
   8   /**
   9    * Custom page margins ticket item whose value is a
  10    * {@code print_preview.Margins}.
  11    * @param {!print_preview.AppState} appState App state used to persist custom
  12    *     margins.
  13    * @param {!print_preview.DocumentInfo} documentInfo Information about the
  14    *     document to print.
  15    * @constructor
  16    * @extends {print_preview.ticket_items.TicketItem}
  17    */
  18   function CustomMargins(appState, documentInfo) {
  19     print_preview.ticket_items.TicketItem.call(
  20         this,
  21         appState,
  22         print_preview.AppState.Field.CUSTOM_MARGINS,
  23         null /*destinationStore*/,
  24         documentInfo);
  25   };
  26
  27   /**
  28    * Enumeration of the orientations of margins.
  29    * @enum {string}
  30    */
  31   CustomMargins.Orientation = {
  32     TOP: 'top',
  33     RIGHT: 'right',
  34     BOTTOM: 'bottom',
  35     LEFT: 'left'
  36   };
  37
  38   /**
  39    * Mapping of a margin orientation to its opposite.
  40    * @type {!Object<!print_preview.ticket_items.CustomMargins.Orientation,
  41    *                 !print_preview.ticket_items.CustomMargins.Orientation>}
  42    * @private
  43    */
  44   CustomMargins.OppositeOrientation_ = {};
  45   CustomMargins.OppositeOrientation_[CustomMargins.Orientation.TOP] =
  46       CustomMargins.Orientation.BOTTOM;
  47   CustomMargins.OppositeOrientation_[CustomMargins.Orientation.RIGHT] =
  48       CustomMargins.Orientation.LEFT;
  49   CustomMargins.OppositeOrientation_[CustomMargins.Orientation.BOTTOM] =
  50       CustomMargins.Orientation.TOP;
  51   CustomMargins.OppositeOrientation_[CustomMargins.Orientation.LEFT] =
  52       CustomMargins.Orientation.RIGHT;
  53
  54   /**
  55    * Minimum distance in points that two margins can be separated by.
  56    * @type {number}
  57    * @const
  58    * @private
  59    */
  60   CustomMargins.MINIMUM_MARGINS_DISTANCE_ = 72; // 1 inch.
  61
  62   CustomMargins.prototype = {
  63     __proto__: print_preview.ticket_items.TicketItem.prototype,
  64
  65     /** @override */
  66     wouldValueBeValid: function(value) {
  67       var margins = /** @type {!print_preview.Margins} */ (value);
  68       for (var key in CustomMargins.Orientation) {
  69         var o = CustomMargins.Orientation[key];
  70         var max = this.getMarginMax_(
  71             o, margins.get(CustomMargins.OppositeOrientation_[o]));
  72         if (margins.get(o) > max || margins.get(o) < 0) {
  73           return false;
  74         }
  75       }
  76       return true;
  77     },
  78
  79     /** @override */
  80     isCapabilityAvailable: function() {
  81       return this.getDocumentInfoInternal().isModifiable;
  82     },
  83
  84     /** @override */
  85     isValueEqual: function(value) {
  86       return this.getValue().equals(value);
  87     },
  88
  89     /**
  90      * @param {!print_preview.ticket_items.CustomMargins.Orientation}
  91      *     orientation Specifies the margin to get the maximum value for.
  92      * @return {number} Maximum value in points of the specified margin.
  93      */
  94     getMarginMax: function(orientation) {
  95       var oppositeOrient = CustomMargins.OppositeOrientation_[orientation];
  96       var margins = /** @type {!print_preview.Margins} */ (this.getValue());
  97       return this.getMarginMax_(orientation, margins.get(oppositeOrient));
  98     },
  99
 100     /** @override */
 101     updateValue: function(value) {
 102       var margins = /** @type {!print_preview.Margins} */ (value);
 103       if (margins != null) {
 104         margins = new print_preview.Margins(
 105             Math.round(margins.get(CustomMargins.Orientation.TOP)),
 106             Math.round(margins.get(CustomMargins.Orientation.RIGHT)),
 107             Math.round(margins.get(CustomMargins.Orientation.BOTTOM)),
 108             Math.round(margins.get(CustomMargins.Orientation.LEFT)));
 109       }
 110       print_preview.ticket_items.TicketItem.prototype.updateValue.call(
 111           this, margins);
 112     },
 113
 114     /**
 115      * Updates the specified margin in points while keeping the value within
 116      * a maximum and minimum.
 117      * @param {!print_preview.ticket_items.CustomMargins.Orientation}
 118      *     orientation Specifies the margin to update.
 119      * @param {number} value Updated margin value in points.
 120      */
 121     updateMargin: function(orientation, value) {
 122       var margins = /** @type {!print_preview.Margins} */ (this.getValue());
 123       var oppositeOrientation = CustomMargins.OppositeOrientation_[orientation];
 124       var max =
 125           this.getMarginMax_(orientation, margins.get(oppositeOrientation));
 126       value = Math.max(0, Math.min(max, value));
 127       this.updateValue(margins.set(orientation, value));
 128     },
 129
 130     /** @override */
 131     getDefaultValueInternal: function() {
 132       return this.getDocumentInfoInternal().margins ||
 133              new print_preview.Margins(72, 72, 72, 72);
 134     },
 135
 136     /** @override */
 137     getCapabilityNotAvailableValueInternal: function() {
 138       return this.getDocumentInfoInternal().margins ||
 139              new print_preview.Margins(72, 72, 72, 72);
 140     },
 141
 142     /**
 143      * @param {!print_preview.ticket_items.CustomMargins.Orientation}
 144      *     orientation Specifies which margin to get the maximum value of.
 145      * @param {number} oppositeMargin Value of the margin in points
 146      *     opposite the specified margin.
 147      * @return {number} Maximum value in points of the specified margin.
 148      * @private
 149      */
 150     getMarginMax_: function(orientation, oppositeMargin) {
 151       var max;
 152       if (orientation == CustomMargins.Orientation.TOP ||
 153           orientation == CustomMargins.Orientation.BOTTOM) {
 154         max = this.getDocumentInfoInternal().pageSize.height - oppositeMargin -
 155             CustomMargins.MINIMUM_MARGINS_DISTANCE_;
 156       } else {
 157         max = this.getDocumentInfoInternal().pageSize.width - oppositeMargin -
 158             CustomMargins.MINIMUM_MARGINS_DISTANCE_;
 159       }
 160       return Math.round(max);
 161     }
 162   };
 163
 164   // Export
 165   return {
 166     CustomMargins: CustomMargins
 167   };
 168 });