blog/src/lib/Sidenote.svelte

149 lines
3.8 KiB
Svelte

<style lang="scss">
/* always applicable */
:global(body) {
counter-reset: sidenote;
}
.counter {
counter-increment: sidenote;
color: #444;
&:after {
font-size: 0.75rem;
position: relative;
bottom: 0.3rem;
}
}
.sidenote {
font-size: 0.8rem;
&:before {
content: counter(sidenote) " ";
position: relative;
font-size: 0.75rem;
bottom: 0.2rem;
}
}
.sidenote-toggle {
display: none;
}
/* desktop display */
@media(min-width: 70em) {
.counter:after {
content: counter(sidenote);
}
.sidenote {
position: absolute;
left: calc(50vw + var(--content-width) / 2 + 1rem);
max-width: 12rem;
hyphens: auto;
}
}
/* mobile display */
@media (max-width: 70em) {
.counter:after {
content: "[" counter(sidenote) "]";
}
.counter:hover:after {
color: #000;
cursor: pointer;
}
.sidenote {
box-sizing: border-box;
position: fixed;
left: 0;
bottom: 0;
width: 100vw;
padding-top: 1rem;
padding-bottom: 1rem;
padding-right: 2rem;
background-color: #fff;
box-shadow: 0 -2px 4px -1px rgba(0, 0, 0, 0.06), 0 -2px 12px -2px rgba(0, 0, 0, 0.1);
display: none;
}
.sidenote-toggle:checked + .sidenote {
display: block;
}
}
/* slight tweaks for in between state */
@media (min-width: 52.5em) and (max-width: 70em) {
.sidenote {
padding-left: calc(50vw - 19rem);
}
}
@media (max-width: 52.5em) {
.sidenote {
padding-left: 2rem;
}
}
</style>
<script context="module">
import { browser } from '$app/env';
var sidenotes = {};
function tileNotes() {
// find and fix collisions between sidenotes
const minNoteGap = 15;
var prevBottom = 0;
Object.values(sidenotes).forEach(s => {
if (window.getComputedStyle(s.note).position === 'fixed') {
// fixed position means we are in mobile territory,
// so get rid of the overflow stuff
s.note.style.top = '';
return;
}
let labelTop = s.label.getBoundingClientRect().y + window.scrollY;
let noteHeight = s.note.getBoundingClientRect().height;
if (labelTop < prevBottom + minNoteGap) {
// there is a collision
s.note.style.top = `${prevBottom + minNoteGap}px`;
prevBottom = prevBottom + minNoteGap + noteHeight;
}
else {
// no collision, but these don't quite match otherwise
s.note.style.top = `${labelTop}px`;
prevBottom = labelTop + noteHeight;
}
})
}
if (browser) {
window.addEventListener('resize', tileNotes);
}
</script>
<script>
import { onMount } from 'svelte';
const id = Math.random().toString().slice(2);
sidenotes[id] = {mounted: false};
let label;
let note;
onMount(async () => {
sidenotes[id] = {mounted: true, label, note};
if (Object.values(sidenotes).every(n => n.mounted)) {
// all sidenotes have been mounted, now we can fix the collisions
tileNotes();
}
return () => sidenotes[id].mounted = false;
});
</script>
<label bind:this={label} for={id} class="counter"></label>
<input type="checkbox" class="sidenote-toggle" {id}/>
<span bind:this={note} class="sidenote">
<slot></slot>
</span>