Javascript
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256行
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9.3 KB
// Copyright (c) 2012 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;
/**
* FontSettings class
* Encapsulated handling of the 'Fonts and Encoding' page.
* @class
*/
function FontSettings() {
OptionsPage.call(this,
'fonts',
loadTimeData.getString('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.addEventListener(
'change', this.standardRangeChanged_.bind(this, standardFontRange));
standardFontRange.customChangeHandler =
this.standardFontSizeChanged_.bind(standardFontRange);
var minimumFontRange = $('minimum-font-size');
minimumFontRange.valueMap = [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 20, 22, 24];
minimumFontRange.addEventListener(
'change', this.minimumRangeChanged_.bind(this, minimumFontRange));
minimumFontRange.customChangeHandler =
this.minimumFontSizeChanged_.bind(minimumFontRange);
var placeholder = loadTimeData.getString('fontSettingsPlaceholder');
var elements = [$('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);
});
$('font-settings-confirm').onclick = function() {
OptionsPage.closeOverlay();
};
$('advanced-font-settings-options').onclick = function() {
chrome.send('openAdvancedFontSettingsOptions');
};
},
/**
* 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;
}
},
/**
* Handler that is called when the user changes the position of the standard
* font size slider. This allows the UI to show a preview of the change
* before the slider has been released and the associated prefs updated.
* @param {Element} el The slider input element.
* @param {Event} event Change event.
* @private
*/
standardRangeChanged_: function(el, event) {
var size = el.mapPositionToPref(el.value);
var fontSampleEl = $('standard-font-sample');
this.setUpFontSample_(fontSampleEl, size, fontSampleEl.style.fontFamily,
true);
fontSampleEl = $('serif-font-sample');
this.setUpFontSample_(fontSampleEl, size, fontSampleEl.style.fontFamily,
true);
fontSampleEl = $('sans-serif-font-sample');
this.setUpFontSample_(fontSampleEl, size, fontSampleEl.style.fontFamily,
true);
fontSampleEl = $('fixed-font-sample');
this.setUpFontSample_(fontSampleEl,
size - OptionsPage.SIZE_DIFFERENCE_FIXED_STANDARD,
fontSampleEl.style.fontFamily, false);
},
/**
* Sets the 'default_fixed_font_size' preference when the user changes the
* standard font size.
* @param {Event} event Change event.
* @private
*/
standardFontSizeChanged_: function(event) {
var size = this.mapPositionToPref(this.value);
Preferences.setIntegerPref(
'webkit.webprefs.default_fixed_font_size',
size - OptionsPage.SIZE_DIFFERENCE_FIXED_STANDARD, true);
return false;
},
/**
* Handler that is called when the user changes the position of the minimum
* font size slider. This allows the UI to show a preview of the change
* before the slider has been released and the associated prefs updated.
* @param {Element} el The slider input element.
* @param {Event} event Change event.
* @private
*/
minimumRangeChanged_: function(el, event) {
var size = el.mapPositionToPref(el.value);
var fontSampleEl = $('minimum-font-sample');
this.setUpFontSample_(fontSampleEl, size, fontSampleEl.style.fontFamily,
true);
},
/**
* Sets the 'minimum_logical_font_size' preference when the user changes the
* minimum font size.
* @param {Event} event Change event.
* @private
*/
minimumFontSizeChanged_: function(event) {
var size = this.mapPositionToPref(this.value);
Preferences.setIntegerPref(
'webkit.webprefs.minimum_logical_font_size', size, true);
return false;
},
/**
* Sets the text, font size and font family of the sample text.
* @param {Element} el The div containing the sample text.
* @param {number} size The font size of the sample text.
* @param {string} font The font family of the sample text.
* @param {bool} showSize True if the font size should appear in the sample.
* @private
*/
setUpFontSample_: function(el, size, font, showSize) {
var prefix = showSize ? (size + ': ') : '';
el.textContent = prefix +
loadTimeData.getString('fontSettingsLoremIpsum');
el.style.fontSize = size + 'px';
if (font)
el.style.fontFamily = font;
},
/**
* Populates a select list and selects the specified item.
* @param {Element} element The select element to populate.
* @param {Array} items The array of items from which to populate.
* @param {string} selectedValue The selected item.
* @private
*/
populateSelect_: function(element, items, selectedValue) {
// Remove any existing content.
element.textContent = '';
// Insert new child nodes into select element.
var value, text, selected, option;
for (var i = 0; i < items.length; i++) {
value = items[i][0];
text = items[i][1];
dir = items[i][2];
if (text) {
selected = value == selectedValue;
var option = new Option(text, value, false, selected);
option.dir = dir;
element.appendChild(option);
} else {
element.appendChild(document.createElement('hr'));
}
}
element.setDisabled('noFontsAvailable', false);
}
};
// Chrome callbacks
FontSettings.setFontsData = function(fonts, encodings, selectedValues) {
FontSettings.getInstance().populateSelect_($('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);
};
/**
* @param {boolean} available Whether the Advanced Font Settings Extension
* is installed and enabled.
*/
FontSettings.notifyAdvancedFontSettingsAvailability = function(available) {
$('advanced-font-settings-install').hidden = available;
$('advanced-font-settings-options').hidden = !available;
};
// Export
return {
FontSettings: FontSettings
};
});