Files
blog_os/blog/static/js/edition-2/main.js
2021-10-17 18:31:40 +02:00

100 lines
2.6 KiB
JavaScript

window.onload = function () {
let container = document.querySelector('#toc-aside');
if (container != null) {
resize_toc(container);
toc_scroll_position(container);
window.onscroll = function () { toc_scroll_position(container) };
}
}
function resize_toc(container) {
let containerHeight = container.clientHeight;
let resize = function () {
if (containerHeight > document.documentElement.clientHeight - 100) {
container.classList.add('coarse');
} else {
container.classList.remove('coarse');
}
};
resize();
let resizeId;
window.onresize = function () {
clearTimeout(resizeId);
resizeId = setTimeout(resize, 300);
};
}
function toc_scroll_position(container) {
if (container.offsetParent === null) {
// skip computation if ToC is not visible
return;
}
// remove active class for all items
for (item of container.querySelectorAll("li")) {
item.classList.remove("active");
}
// look for active item
let site_offset = document.documentElement.scrollTop;
let current_toc_item = null;
for (item of container.querySelectorAll("li")) {
if (item.offsetParent === null) {
// skip items that are not visible
continue;
}
let anchor = item.firstElementChild.getAttribute("href");
let heading = document.querySelector(anchor);
if (heading.offsetTop <= (site_offset + document.documentElement.clientHeight / 3)) {
current_toc_item = item;
} else {
break;
}
}
// set active class for current ToC item
if (current_toc_item != null) {
current_toc_item.classList.add("active");
}
}
function toggle_lights() {
if (document.documentElement.getAttribute("data-theme") === "dark") {
set_theme("light")
} else if (document.documentElement.getAttribute("data-theme") === "light") {
set_theme("dark")
} else {
set_theme(window.matchMedia("(prefers-color-scheme: dark)").matches ? "light" : "dark")
}
}
function set_theme(theme) {
document.documentElement.setAttribute("data-theme", theme)
set_giscus_theme(theme)
localStorage.setItem("theme", theme)
}
function clear_theme_override() {
document.documentElement.removeAttribute("data-theme");
set_giscus_theme("preferred_color_scheme")
localStorage.removeItem("theme")
}
function set_giscus_theme(theme) {
let comment_form = document.querySelector("iframe.giscus-frame");
if (comment_form != null) {
comment_form.contentWindow.postMessage({
giscus: { setConfig: { theme: theme } }
}, "https://giscus.app")
}
}
function giscus_loaded() {
let theme = localStorage.getItem("theme");
if (theme != null) {
set_giscus_theme(theme)
}
}