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/*global window, localStorage, fontSizeTitle, bigger, reset, smaller, biggerTitle, resetTitle, smallerTitle, Cookie */
var prefsLoaded = false;
var defaultFontSize = 100;
var currentFontSize = defaultFontSize;
var fontSizeTitle;
var bigger;
var smaller;
var reset;
var biggerTitle;
var smallerTitle;
var resetTitle;
Object.append(Browser.Features, {
localstorage: (function() {
return ('localStorage' in window) && window.localStorage !== null;
})()
});
function setFontSize(fontSize) {
document.body.style.fontSize = fontSize + '%';
}
function changeFontSize(sizeDifference) {
currentFontSize = parseInt(currentFontSize, 10) + parseInt(sizeDifference * 5, 10);
if (currentFontSize > 180) {
currentFontSize = 180;
} else if (currentFontSize < 60) {
currentFontSize = 60;
}
setFontSize(currentFontSize);
}
function revertStyles() {
currentFontSize = defaultFontSize;
changeFontSize(0);
}
function writeFontSize(value) {
if (Browser.Features.localstorage) {
localStorage.fontSize = value;
} else {
Cookie.write("fontSize", value, {duration: 180});
}
}
function readFontSize() {
if (Browser.Features.localstorage) {
return localStorage.fontSize;
} else {
return Cookie.read("fontSize");
}
}
function setUserOptions() {
if (!prefsLoaded) {
var size = readFontSize();
currentFontSize = size ? size : defaultFontSize;
setFontSize(currentFontSize);
prefsLoaded = true;
}
}
function addControls() {
var container = document.id('fontsize');
var content = '<h3>'+ fontSizeTitle +'</h3><p><a title="'+ biggerTitle +'" href="#" onclick="changeFontSize(2); return false">'+ bigger +'</a><span class="unseen">.</span><a href="#" title="'+resetTitle+'" onclick="revertStyles(); return false">'+ reset +'</a><span class="unseen">.</span><a href="#" title="'+ smallerTitle +'" onclick="changeFontSize(-2); return false">'+ smaller +'</a></p>';
container.set('html', content);
}
function saveSettings() {
writeFontSize(currentFontSize);
}
window.addEvent('domready', setUserOptions);
window.addEvent('domready', addControls);
window.addEvent('unload', saveSettings);