UI refresh of Advanced Font Settings Extension

chrome/common/extensions/docs/examples/api/fontSettings/pending_changes.js

+// Copyright (c) 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;
+};