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<script lang="ts">
import { spring } from 'svelte/motion';
let count = 0;
const displayed_count = spring();
$: displayed_count.set(count);
$: offset = modulo($displayed_count, 1);
function modulo(n: number, m: number) {
// handle negative numbers
return ((n % m) + m) % m;
}
</script>
<div class="counter">
<button on:click={() => (count -= 1)} aria-label="Decrease the counter by one">
<svg aria-hidden="true" viewBox="0 0 1 1">
<path d="M0,0.5 L1,0.5" />
</svg>
</button>
<div class="counter-viewport">
<div class="counter-digits" style="transform: translate(0, {100 * offset}%)">
<strong class="hidden" aria-hidden="true">{Math.floor($displayed_count + 1)}</strong>
<strong>{Math.floor($displayed_count)}</strong>
</div>
</div>
<button on:click={() => (count += 1)} aria-label="Increase the counter by one">
<svg aria-hidden="true" viewBox="0 0 1 1">
<path d="M0,0.5 L1,0.5 M0.5,0 L0.5,1" />
</svg>
</button>
</div>
<style>
.counter {
display: flex;
border-top: 1px solid rgba(0, 0, 0, 0.1);
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
margin: 1rem 0;
}
.counter button {
width: 2em;
padding: 0;
display: flex;
align-items: center;
justify-content: center;
border: 0;
background-color: transparent;
color: var(--text-color);
font-size: 2rem;
}
.counter button:hover {
background-color: var(--secondary-color);
}
svg {
width: 25%;
height: 25%;
}
path {
vector-effect: non-scaling-stroke;
stroke-width: 2px;
stroke: var(--text-color);
}
.counter-viewport {
width: 8em;
height: 4em;
overflow: hidden;
text-align: center;
position: relative;
}
.counter-viewport strong {
position: absolute;
display: flex;
width: 100%;
height: 100%;
font-weight: 400;
color: var(--accent-color);
font-size: 4rem;
align-items: center;
justify-content: center;
}
.counter-digits {
position: absolute;
width: 100%;
height: 100%;
}
.hidden {
top: -100%;
user-select: none;
}
</style>
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