text: // Copyright 2013 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.
  
  'use strict';
  
  /**
   * @fileoverview PendingChanges class tracks changes to be applied when an
   * "Apply Changes" button is clicked.
   */
  
  /**
   * Creates a PendingChanges object with no pending changes.
   *
   * @constructor
   */
  var PendingChanges = function() {
    // Format: pendingFontChanges_.Cyrl.sansserif = "My SansSerif Cyrillic Font"
    this.pendingFontChanges_ = {};
  
    // Format: pendingFontSizeChanges_.defaultFontSize = 12
    this.pendingFontSizeChanges_ = {};
  };
  
  /**
   * Returns the pending font setting change for the specified script and family,
   * or null if it doesn't exist.
   *
   * @param {string} script The script code, like "Cyrl".
   * @param {string} genericFamily The generic family, like "sansserif".
   * @return {?string} The pending font setting, like "My Cyrillic SansSerif Font"
   *     or null if it doesn't exist.
   */
  PendingChanges.prototype.getFont = function(script, genericFamily) {
    if (this.pendingFontChanges_[script])
      return this.pendingFontChanges_[script][genericFamily];
    return null;
  };
  
  /**
   * Returns the pending font size setting change, or null if it doesn't exist.
   *
   * @param {string} fontSizeKey The font size setting key. One of
   *     'defaultFontSize', 'defaultFixedFontSize', or 'minFontSize'.
   * @return {?number} The pending font size setting in pixels, or null if it
   *     doesn't exist.
   */
  PendingChanges.prototype.getFontSize = function(fontSizeKey) {
    return this.pendingFontSizeChanges_[fontSizeKey];
  };
  
  /**
   * Sets the pending font change for the specified script and family.
   *
   * @param {string} script The script code, like "Cyrl".
   * @param {string} genericFamily The generic family, like "sansserif".
   * @param {?string} font The font to set the setting to, or null to clear it.
   */
  PendingChanges.prototype.setFont = function(script, genericFamily, font) {
    if (!this.pendingFontChanges_[script])
      this.pendingFontChanges_[script] = {};
    if (this.pendingFontChanges_[script][genericFamily] == font)
      return;
    this.pendingFontChanges_[script][genericFamily] = font;
  };
  
  /**
   * Sets the pending font size change.
   *
   * @param {string} fontSizeKey The font size setting key. See
   *     getFontSize().
   * @param {number} size The font size to set the setting to.
   */
  PendingChanges.prototype.setFontSize = function(fontSizeKey, size) {
    if (this.pendingFontSizeChanges_[fontSizeKey] == size)
      return;
    this.pendingFontSizeChanges_[fontSizeKey] = size;
  };
  
  /**
   * Commits the pending changes to Chrome. After this function is called, there
   * are no pending changes.
   */
  PendingChanges.prototype.apply = function() {
    for (var script in this.pendingFontChanges_) {
      for (var genericFamily in this.pendingFontChanges_[script]) {
        var fontId = this.pendingFontChanges_[script][genericFamily];
        if (fontId == null)
          continue;
        var details = {};
        details.script = script;
        details.genericFamily = genericFamily;
        details.fontId = fontId;
        chrome.fontSettings.setFont(details);
      }
    }
  
    var size = this.pendingFontSizeChanges_['defaultFontSize'];
    if (size != null)
      chrome.fontSettings.setDefaultFontSize({pixelSize: size});
  
    size = this.pendingFontSizeChanges_['defaultFixedFontSize'];
    if (size != null)
      chrome.fontSettings.setDefaultFixedFontSize({pixelSize: size});
  
    size = this.pendingFontSizeChanges_['minFontSize'];
    if (size != null)
      chrome.fontSettings.setMinimumFontSize({pixelSize: size});
  
    this.clear();
  };
  
  /**
   * Clears the pending font changes for a single script.
   *
   * @param {string} script The script code, like "Cyrl".
   */
  PendingChanges.prototype.clearOneScript = function(script) {
    this.pendingFontChanges_[script] = {};
  };
  
  /**
   * Clears all pending font changes.
   */
  PendingChanges.prototype.clear = function() {
    this.pendingFontChanges_ = {};
    this.pendingFontSizeChanges_ = {};
  };
  
  /**
   * @return {boolean} True if there are no pending changes, otherwise false.
   */
  PendingChanges.prototype.isEmpty = function() {
    for (var script in this.pendingFontChanges_) {
      for (var genericFamily in this.pendingFontChanges_[script]) {
        if (this.pendingFontChanges_[script][genericFamily] != null)
          return false;
      }
    }
    for (var name in this.pendingFontSizeChanges_) {
      if (this.pendingFontSizeChanges_[name] != null)
        return false;
    }
    return true;
  };
  