Options2: Pull the trigger.

chrome/browser/resources/options2/font_settings.js

+// Copyright (c) 2011 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('options', function() {
+
+  var OptionsPage = options.OptionsPage;
+
+  /**
+   * This is the absolute difference maintained between standard and
+   * fixed-width font sizes. Refer http://crbug.com/91922.
+   */
+  const SIZE_DIFFERENCE_FIXED_STANDARD = 3;
+
+  /**
+   * FontSettings class
+   * Encapsulated handling of the 'Fonts and Encoding' page.
+   * @class
+   */
+  function FontSettings() {
+    OptionsPage.call(this,
+                     'fonts',
+                     templateData.fontSettingsPageTabTitle,
+                     'font-settings');
+  }
+
+  cr.addSingletonGetter(FontSettings);
+
+  FontSettings.prototype = {
+    __proto__: OptionsPage.prototype,
+
+    /**
+     * Initialize the page.
+     */
+    initializePage: function() {
+      OptionsPage.prototype.initializePage.call(this);
+
+      var standardFontRange = $('standard-font-size');
+      standardFontRange.valueMap = [9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20,
+          22, 24, 26, 28, 30, 32, 34, 36, 40, 44, 48, 56, 64, 72];
+      standardFontRange.continuous = false;
+      standardFontRange.notifyChange = this.standardRangeChanged_.bind(this);
+      standardFontRange.notifyPrefChange =
+          this.standardFontSizeChanged_.bind(this);
+
+      var minimumFontRange = $('minimum-font-size');
+      minimumFontRange.valueMap = [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
+          18, 20, 22, 24];
+      minimumFontRange.continuous = false;
+      minimumFontRange.notifyChange = this.minimumRangeChanged_.bind(this);
+      minimumFontRange.notifyPrefChange =
+          this.minimumFontSizeChanged_.bind(this);
+
+      var placeholder = localStrings.getString('fontSettingsPlaceholder');
+      var elements = [$('standard-font-family'), $('serif-font-family'),
+                      $('sans-serif-font-family'), $('fixed-font-family'),
+                      $('font-encoding')];
+      elements.forEach(function(el) {
+        el.appendChild(new Option(placeholder));
+        el.setDisabled('noFontsAvailable', true);
+      });
+    },
+
+    /**
+     * Called by the options page when this page has been shown.
+     */
+    didShowPage: function() {
+      // The fonts list may be large so we only load it when this page is
+      // loaded for the first time.  This makes opening the options window
+      // faster and consume less memory if the user never opens the fonts
+      // dialog.
+      if (!this.hasShown) {
+        chrome.send('fetchFontsData');
+        this.hasShown = true;
+      }
+    },
+
+    /**
+     * Called as the user changes the standard font size.  This allows for
+     * reflecting the change in the UI before the preference has been changed.
+     * @param {Element} el The slider input element.
+     * @param {number} value The mapped value currently set by the slider.
+     * @private
+     */
+    standardRangeChanged_: function(el, value) {
+      var fontSampleEl = $('standard-font-sample');
+      this.setUpFontSample_(fontSampleEl, value, fontSampleEl.style.fontFamily,
+                            true);
+
+      fontSampleEl = $('serif-font-sample');
+      this.setUpFontSample_(fontSampleEl, value, fontSampleEl.style.fontFamily,
+                            true);
+
+      fontSampleEl = $('sans-serif-font-sample');
+      this.setUpFontSample_(fontSampleEl, value, fontSampleEl.style.fontFamily,
+                            true);
+
+      fontSampleEl = $('fixed-font-sample');
+      this.setUpFontSample_(fontSampleEl,
+                            value - SIZE_DIFFERENCE_FIXED_STANDARD,
+                            fontSampleEl.style.fontFamily, false);
+    },
+
+    /**
+     * Sets the 'default_fixed_font_size' preference when the standard font
+     * size has been changed by the user.
+     * @param {Element} el The slider input element.
+     * @param {number} value The mapped value that has been saved.
+     * @private
+     */
+    standardFontSizeChanged_: function(el, value) {
+      Preferences.setIntegerPref('webkit.webprefs.default_fixed_font_size',
+                                 value - SIZE_DIFFERENCE_FIXED_STANDARD, '');
+    },
+
+    /**
+     * Called as the user changes the miniumum font size.  This allows for
+     * reflecting the change in the UI before the preference has been changed.
+     * @param {Element} el The slider input element.
+     * @param {number} value The mapped value currently set by the slider.
+     * @private
+     */
+    minimumRangeChanged_: function(el, value) {
+      var fontSampleEl = $('minimum-font-sample');
+      this.setUpFontSample_(fontSampleEl, value, fontSampleEl.style.fontFamily,
+                            true);
+    },
+
+    /**
+     * Sets the 'minimum_logical_font_size' preference when the minimum font
+     * size has been changed by the user.
+     * @param {Element} el The slider input element.
+     * @param {number} value The mapped value that has been saved.
+     * @private
+     */
+    minimumFontSizeChanged_: function(el, value) {
+      Preferences.setIntegerPref('webkit.webprefs.minimum_logical_font_size',
+          value, '');
+    },
+
+    /**
+     * Sets the text, font size and font family of the sample text.
+     * @param {Element} el The div containing the sample text.
+     * @param {number} size The font size of the sample text.
+     * @param {string} font The font family of the sample text.
+     * @param {bool} showSize True if the font size should appear in the sample.
+     * @private
+     */
+    setUpFontSample_: function(el, size, font, showSize) {
+      var prefix = showSize ? (size + ': ') : '';
+      el.textContent = prefix +
+          localStrings.getString('fontSettingsLoremIpsum');
+      el.style.fontSize = size + 'px';
+      if (font)
+        el.style.fontFamily = font;
+    },
+
+    /**
+     * Populates a select list and selects the specified item.
+     * @param {Element} element The select element to populate.
+     * @param {Array} items The array of items from which to populate.
+     * @param {string} selectedValue The selected item.
+     * @private
+     */
+    populateSelect_: function(element, items, selectedValue) {
+      // Remove any existing content.
+      element.textContent = '';
+
+      // Insert new child nodes into select element.
+      var value, text, selected, option;
+      for (var i = 0; i < items.length; i++) {
+        value = items[i][0];
+        text = items[i][1];
+        if (text) {
+          selected = value == selectedValue;
+          element.appendChild(new Option(text, value, false, selected));
+        } else {
+          element.appendChild(document.createElement('hr'));
+        }
+      }
+
+      element.setDisabled('noFontsAvailable', false);
+    }
+  };
+
+  // Chrome callbacks
+  FontSettings.setFontsData = function(fonts, encodings, selectedValues) {
+    FontSettings.getInstance().populateSelect_($('standard-font-family'), fonts,
+                                               selectedValues[0]);
+    FontSettings.getInstance().populateSelect_($('serif-font-family'), fonts,
+                                               selectedValues[1]);
+    FontSettings.getInstance().populateSelect_($('sans-serif-font-family'),
+                                               fonts, selectedValues[2]);
+    FontSettings.getInstance().populateSelect_($('fixed-font-family'), fonts,
+                                               selectedValues[3]);
+    FontSettings.getInstance().populateSelect_($('font-encoding'), encodings,
+                                               selectedValues[4]);
+  };
+
+  FontSettings.setUpStandardFontSample = function(font, size) {
+    FontSettings.getInstance().setUpFontSample_($('standard-font-sample'), size,
+                                                font, true);
+  };
+
+  FontSettings.setUpSerifFontSample = function(font, size) {
+    FontSettings.getInstance().setUpFontSample_($('serif-font-sample'), size,
+                                                font, true);
+  };
+
+  FontSettings.setUpSansSerifFontSample = function(font, size) {
+    FontSettings.getInstance().setUpFontSample_($('sans-serif-font-sample'),
+                                                size, font, true);
+  };
+
+  FontSettings.setUpFixedFontSample = function(font, size) {
+    FontSettings.getInstance().setUpFontSample_($('fixed-font-sample'),
+                                                size, font, false);
+  };
+
+  FontSettings.setUpMinimumFontSample = function(size) {
+    // If size is less than 6, represent it as six in the sample to account
+    // for the minimum logical font size.
+    if (size < 6)
+      size = 6;
+    FontSettings.getInstance().setUpFontSample_($('minimum-font-sample'), size,
+                                                null, true);
+  };
+
+  // Export
+  return {
+    FontSettings: FontSettings
+  };
+});
+