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gitbook.require(["gitbook", "lodash", "jQuery"], function(gitbook, _, $) {
var fontState;
var THEMES = {
"white": 0,
"sepia": 1,
"night": 2
};
var FAMILY = {
"serif": 0,
"sans": 1
};
// Save current font settings
function saveFontSettings() {
gitbook.storage.set("fontState", fontState);
update();
}
// Increase font size
function enlargeFontSize(e) {
e.preventDefault();
if (fontState.size >= 4) return;
fontState.size++;
saveFontSettings();
};
// Decrease font size
function reduceFontSize(e) {
e.preventDefault();
if (fontState.size <= 0) return;
fontState.size--;
saveFontSettings();
};
// Change font family
function changeFontFamily(index, e) {
e.preventDefault();
fontState.family = index;
saveFontSettings();
};
// Change type of color
function changeColorTheme(index, e) {
e.preventDefault();
var $book = $(".book");
if (fontState.theme !== 0)
$book.removeClass("color-theme-"+fontState.theme);
fontState.theme = index;
if (fontState.theme !== 0)
$book.addClass("color-theme-"+fontState.theme);
saveFontSettings();
};
// Increase or decrease line spacing
function changeSpacing(e, inc = true) {
e.preventDefault();
inc ? fontState.spacing++ : (fontState.spacing > 10 && fontState.spacing--);
saveFontSettings();
}
function update() {
var $book = gitbook.state.$book;
$(".font-settings .font-family-list li").removeClass("active");
$(".font-settings .font-family-list li:nth-child("+(fontState.family+1)+")").addClass("active");
$book[0].className = $book[0].className.replace(/\bfont-\S+/g, '');
$book.addClass("font-size-"+fontState.size);
$book.addClass("font-family-"+fontState.family);
if(fontState.theme !== 0) {
$book[0].className = $book[0].className.replace(/\bcolor-theme-\S+/g, '');
$book.addClass("color-theme-"+fontState.theme);
}
var lineHeight = fontState.spacing / 10;
$book.find('section').css('line-height', lineHeight);
$('.font-settings .spacing-reduce').prop('disabled', lineHeight <= 1);
};
function init(config) {
var $bookBody, $book;
//Find DOM elements.
$book = gitbook.state.$book;
$bookBody = $book.find(".book-body");
// Instantiate font state object
fontState = gitbook.storage.get("fontState", {
size: config.size || 2,
family: FAMILY[config.family || "sans"],
theme: THEMES[config.theme || "white"],
spacing: config.spacing || 17,
});
update();
};
gitbook.events.bind("start", function(e, config) {
var opts = config.fontsettings;
if (!opts) return;
// Create buttons in toolbar
gitbook.toolbar.createButton({
icon: 'fa fa-font',
label: 'Font Settings',
className: 'font-settings',
dropdown: [
[
{
text: 'A',
className: 'font-reduce',
onClick: reduceFontSize
},
{
text: 'A',
className: 'font-enlarge',
onClick: enlargeFontSize
}
],
[
{
text: 'Serif',
onClick: _.partial(changeFontFamily, 0)
},
{
text: 'Sans',
onClick: _.partial(changeFontFamily, 1)
}
],
[
{
text: 'White',
onClick: _.partial(changeColorTheme, 0)
},
{
text: 'Sepia',
onClick: _.partial(changeColorTheme, 1)
},
{
text: 'Night',
onClick: _.partial(changeColorTheme, 2)
}
],
[
{
className: 'spacing-reduce',
text: 'Spacing -',
onClick: e => changeSpacing(e, false)
},
{
text: 'Spacing +',
onClick: changeSpacing
}
]
]
});
// Init current settings
init(opts);
});
});
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