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<!-- SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com> -->
<!-- SPDX-License-Identifier: AGPL-3.0-or-later WITH AdditionRef-Progmasoft-Patent-Grant-1.1 -->
<script setup lang="ts">
import { computed, ref, watch } from "vue";
import type { WhyTab } from "../content/landing";
/**
* A row of tabs over one code panel. Each tab shows one strength with a short caption and a sample that the
* compiler repository checks. The arrow keys, Home and End move between tabs, as the ARIA tabs pattern asks.
*/
const props = defineProps<{
tabs: readonly WhyTab[];
copyLabel: string;
copiedLabel: string;
id: string;
}>();
const selected = ref(0);
const copied = ref(false);
const current = computed(() => props.tabs[selected.value] ?? props.tabs[0]);
const buttons = ref<HTMLButtonElement[]>([]);
watch(
() => props.tabs,
() => {
selected.value = 0;
},
);
function select(index: number, focus = false) {
const count = props.tabs.length;
selected.value = (index + count) % count;
copied.value = false;
if (focus) buttons.value[selected.value]?.focus();
}
function onKey(event: KeyboardEvent) {
const moves: Record<string, () => number> = {
ArrowRight: () => selected.value + 1,
ArrowLeft: () => selected.value - 1,
Home: () => 0,
End: () => props.tabs.length - 1,
};
const move = moves[event.key];
if (!move) return;
event.preventDefault();
select(move(), true);
}
async function copy() {
try {
await navigator.clipboard.writeText(current.value.code);
copied.value = true;
} catch {
copied.value = false;
}
}
</script>
<template>
<div class="why-tabs">
<div class="why-tablist" role="tablist" @keydown="onKey">
<button
v-for="(tab, index) in tabs"
:id="`${id}-tab-${index}`"
:key="tab.label"
ref="buttons"
role="tab"
type="button"
:aria-selected="index === selected"
:aria-controls="`${id}-panel`"
:tabindex="index === selected ? 0 : -1"
@click="select(index)"
>
{{ tab.label }}
</button>
</div>
<div
:id="`${id}-panel`"
class="why-panel"
role="tabpanel"
:aria-labelledby="`${id}-tab-${selected}`"
>
<p class="why-caption">{{ current.caption }}</p>
<div class="why-code" dir="ltr">
<div class="why-code-bar">
<span>{{ current.file }}</span>
<button type="button" class="why-copy" @click="copy">
{{ copied ? copiedLabel : copyLabel }}
</button>
</div>
<pre><code>{{ current.code }}</code></pre>
</div>
</div>
</div>
</template>
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