website/src/components/ImageGallery.svelte

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<script lang="ts">
import { onMount } from "svelte";
import { fade } from "svelte/transition";
import normalizeWheel from "@helpers/normalizeWheel";
let images = [];
let progress = [];
let currentIndex = -1;
const maxZoom = 5;
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import { swipe } from "svelte-gestures";
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const mod = (a: number, b: number) => ((a % b) + b) % b;
const lerp = (a: number, b: number, t: number) => a * t + b * (1 - t);
const addIndex = (offset: number) => {
return setIndex(mod(currentIndex + offset, images.length));
};
let mx = 0,
my = 0,
_mx = 0,
_my = 0,
scale = 1;
const setIndex = (index: number) => {
mx = window.innerWidth / 2;
my = window.innerHeight / 2;
scale = 1;
if (index < 0) {
document.body.style.overflowY = "auto";
} else {
document.body.style.overflowY = "hidden";
}
currentIndex = index;
};
const handleKeyDown = ({ key }) => {
if (currentIndex < 0) return;
if (key === "Escape" && currentIndex > -1) setIndex(-1);
if (key === "ArrowLeft") addIndex(-1);
if (key === "ArrowRight") addIndex(+1);
};
const handleOriginalLoading = async (image) => {
if (!image.startedLoading) {
image.startedLoading = true;
let cIndex = currentIndex;
if (image.original) {
const response = await fetch(image.original, {
headers: {
"Accept-Encoding": "gzip, deflate, br",
"Content-Type":
"image/avif,image/webp,image/apng,image/svg+xml,image/jpeg,image/png,image/*,*/*;q=0.8",
},
});
const total = Number(response.headers.get("content-length"));
const reader = response.body.getReader();
let bytesReceived = 0;
let chunks = [];
console.log("[SLIDER] started loading " + image.original);
while (true) {
const { done, value } = await reader.read();
if (done) {
console.log("[SLIDER] Image complete");
break;
}
chunks.push(value);
if (total) {
bytesReceived += value.length;
progress[cIndex] = bytesReceived / total;
console.log(
"[SLIDER] " + Math.floor(progress[cIndex] * 1000) / 10 + "%",
);
progress = progress;
}
}
const b = new Blob(chunks);
images[cIndex].loaded = URL.createObjectURL(b);
images = images;
}
}
};
function handleSwipe(ev: any) {
if (currentIndex === -1) return;
if (ev.detail.direction === "right") addIndex(-1);
if (ev.detail.direction === "left") addIndex(+1);
}
const handleScroll = (ev: WheelEvent) => {
const { pixelY } = normalizeWheel(ev);
scale = Math.min(Math.max(scale - pixelY / 100, 1), maxZoom);
if (scale > 3) {
handleOriginalLoading(images[currentIndex]);
}
};
let isUpdating = false;
const update = () => {
isUpdating && requestAnimationFrame(update);
let dist = Math.abs(mx - _mx) + Math.abs(my - _my);
if (dist < 0.1 || scale == 1) {
mx = _mx;
my = _my;
isUpdating = false;
} else {
let s = (0.2 + (1 - scale / maxZoom) * 0.8) * 0.3;
mx = lerp(mx, _mx, 1 - s);
my = lerp(my, _my, 1 - s);
}
};
const startUpdate = () => {
if (!isUpdating && scale !== 1) {
isUpdating = true;
update();
}
};
const handleMouseMove = (ev: MouseEvent) => {
_mx = ev.clientX;
_my = ev.clientY;
startUpdate();
};
const handlePointerMove = () => {
// console.log(ev);
};
onMount(() => {
const wrappers = Array.prototype.slice.call(
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document.querySelectorAll("picture > img"),
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);
images = wrappers.map((image, i: number) => {
image.classList.add("image-active");
image.addEventListener("click", () => setIndex(i));
image.addEventListener("touch", () => setIndex(i));
image.style.cursor = "pointer";
image.addEventListener("error", () => {
console.log("Error loading", image);
});
let exif = null;
try {
let rawExif = image.getAttribute("data-exif");
exif = JSON.parse(rawExif);
} catch (error) {
// No biggie
}
return {
exif,
// preview: preview.getAttribute("src"),
src: image.getAttribute("srcset"),
alt: image.getAttribute("alt"),
sizes: image.getAttribute("sizes"),
original: image.getAttribute("data-original"),
originalLoaded: false,
};
});
return () => {
wrappers.forEach(({ children: [_, image] }, i: number) => {
image.removeEventListener("click", () => setIndex(i));
});
};
});
</script>
<svelte:window on:keydown={handleKeyDown} />
<div class="image-wrapper">
<slot />
</div>
<div class="gallery-wrapper" class:visible={currentIndex > -1}>
{#if images.length > 1}
<div class="controls">
{#each images as _, i}
<button
class:active={currentIndex === i}
on:click={() => {
currentIndex = i;
}}
/>
{/each}
</div>
{/if}
<button class="left" on:click={() => addIndex(-1)}>&lt;</button>
<button class="right" on:click={() => addIndex(+1)}>&gt;</button>
<button class="close" on:click={() => setIndex(-1)}>X</button>
{#if currentIndex > -1}
<div
class="image"
use:swipe
on:swipe={handleSwipe}
on:wheel|passive={handleScroll}
on:mousemove={handleMouseMove}
on:pointermove={handlePointerMove}
>
{#if progress[currentIndex] && progress[currentIndex] < 0.99}
<div
transition:fade
id="progress"
style={`transform: scaleX(${progress[currentIndex]});`}
/>
{/if}
<img
class="background"
src={images[currentIndex].preview}
alt="background blur"
/>
<span>
<img
style={`transform: scale(${scale}); transform-origin: ${
window.innerWidth - mx
}px ${window.innerHeight - my}px`}
srcset={images[currentIndex].loaded ? "" : images[currentIndex].src}
src={images[currentIndex].loaded}
alt={images[currentIndex].alt}
/>
</span>
</div>
{#if images[currentIndex].exif}
{@const exif = images[currentIndex].exif}
<div class="exif" on:click={() => console.log(exif)}>
{#if "FocalLength" in exif}
{exif.FocalLength}mm |
{/if}
{#if "FNumber" in exif}
<i>f</i>{exif.FNumber} |
{/if}
{#if "ExposureTime" in exif}
{exif.ExposureTime.replace(" s", "s")} |
{/if}
{#if "Date" in exif}
{exif.Date}
{/if}
</div>
{/if}
{/if}
</div>
<style>
#progress {
position: absolute;
bottom: 0px;
height: 10px;
z-index: 99;
left: 47px;
background-color: black;
width: calc(100% - 94px);
transform-origin: left;
transition: transform 0.3s ease;
}
.gallery-wrapper {
position: fixed;
z-index: 199;
top: 0;
left: 0;
height: 100vh;
width: 100vw;
background-color: rgba(24, 24, 24, 0.99);
opacity: 0;
transition: opacity 0.1s ease;
pointer-events: none;
backdrop-filter: blur(20px);
}
.gallery-wrapper.visible {
pointer-events: all;
opacity: 1;
}
.image {
position: relative;
display: grid;
place-items: center;
width: 100%;
height: 100%;
}
.image > span {
height: calc(100vh - 70px);
width: 95%;
}
.image img {
position: relative;
max-width: 100vw;
max-height: 100vh;
width: 100%;
height: 100%;
z-index: 98;
object-fit: contain;
image-rendering: pixelated;
transition:
transform 0.2s ease,
transform-origin 0.1s linear;
}
.image > .background {
filter: brightness(0.2);
position: absolute;
opacity: 0.3;
width: 100%;
z-index: 98;
height: 100%;
object-fit: fill;
}
.controls {
width: fit-content;
left: 50vw;
transform: translateX(-50%);
background: black;
padding: 5px;
position: absolute;
z-index: 99;
display: flex;
}
.controls > button {
width: 15px;
height: 15px;
border-style: none;
background: black;
border: solid 1px white;
cursor: pointer;
margin: 2px;
padding: 0px;
}
.controls > button.active {
background: white;
}
.exif {
position: absolute;
bottom: 0px;
left: 50vw;
transform: translateX(-50%);
z-index: 99;
background-color: black;
color: white;
padding: 5px;
font-size: 0.8em;
white-space: pre;
}
.gallery-wrapper > button {
background: black;
color: white;
border-radius: 0px;
border: none;
padding: 10px 20px;
position: fixed;
z-index: 200;
}
.close {
top: 0;
right: 0;
}
.left {
bottom: 0;
left: 0;
}
.right {
bottom: 0;
right: 0;
}
</style>