103 lines
2.0 KiB
Svelte
103 lines
2.0 KiB
Svelte
<script lang="ts">
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import { spring } from 'svelte/motion';
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let count = 0;
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const displayed_count = spring();
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$: displayed_count.set(count);
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$: offset = modulo($displayed_count, 1);
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function modulo(n: number, m: number) {
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// handle negative numbers
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return ((n % m) + m) % m;
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}
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</script>
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<div class="counter">
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<button on:click={() => (count -= 1)} aria-label="Decrease the counter by one">
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<svg aria-hidden="true" viewBox="0 0 1 1">
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<path d="M0,0.5 L1,0.5" />
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</svg>
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</button>
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<div class="counter-viewport">
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<div class="counter-digits" style="transform: translate(0, {100 * offset}%)">
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<strong class="hidden" aria-hidden="true">{Math.floor($displayed_count + 1)}</strong>
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<strong>{Math.floor($displayed_count)}</strong>
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</div>
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</div>
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<button on:click={() => (count += 1)} aria-label="Increase the counter by one">
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<svg aria-hidden="true" viewBox="0 0 1 1">
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<path d="M0,0.5 L1,0.5 M0.5,0 L0.5,1" />
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</svg>
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</button>
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</div>
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<style>
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.counter {
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display: flex;
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border-top: 1px solid rgba(0, 0, 0, 0.1);
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border-bottom: 1px solid rgba(0, 0, 0, 0.1);
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margin: 1rem 0;
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}
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.counter button {
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width: 2em;
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padding: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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border: 0;
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background-color: transparent;
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touch-action: manipulation;
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font-size: 2rem;
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}
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.counter button:hover {
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background-color: var(--color-bg-1);
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}
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svg {
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width: 25%;
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height: 25%;
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}
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path {
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vector-effect: non-scaling-stroke;
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stroke-width: 2px;
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stroke: #444;
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}
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.counter-viewport {
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width: 8em;
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height: 4em;
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overflow: hidden;
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text-align: center;
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position: relative;
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}
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.counter-viewport strong {
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position: absolute;
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display: flex;
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width: 100%;
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height: 100%;
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font-weight: 400;
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color: var(--color-theme-1);
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font-size: 4rem;
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align-items: center;
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justify-content: center;
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}
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.counter-digits {
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position: absolute;
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width: 100%;
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height: 100%;
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}
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.hidden {
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top: -100%;
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user-select: none;
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}
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</style>
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