Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const props = defineProps<{ trackClass?: string; label: string; role?: string }>()
const track = ref<HTMLElement | null>(null);
const overflow = ref(false);
const index = ref(0);
const canPrev = computed(() => overflow.value && index.value > 0);
const canNext = computed(() => overflow.value && index.value < (track.value?.children.length || 0) - 1);
const compact = computed(() => props.label.includes('onglets'));
let observer: ResizeObserver | undefined
let initialActiveCentered = false
function centerInitialActive() {
const el = track.value;
if (!el || !overflow.value || !compact.value || initialActiveCentered) return;
const active = el.querySelector<HTMLElement>('[aria-selected="true"]');
if (!active) return;
const activeIndex = Array.from(el.children).indexOf(active);
if (activeIndex < 0) return;
const target = Math.max(0, Math.min(
el.scrollWidth - el.clientWidth,
active.offsetLeft - (el.clientWidth - active.offsetWidth) / 2
));
index.value = activeIndex;
initialActiveCentered = true;
el.scrollTo({left: target, behavior: 'auto'})
}
function updateOverflow() {
const el = track.value;
if (!el) return;
overflow.value = el.scrollWidth > el.clientWidth + 2;
if (!overflow.value) index.value = 0
else nextTick(centerInitialActive)
}
function updateIndex() {
const el = track.value;
if (!el || !el.children.length) return;
if (el.scrollLeft <= 2) {
index.value = 0;
return
}
if (el.scrollLeft >= el.scrollWidth - el.clientWidth - 2) {
index.value = el.children.length - 1;
return
}
const reference = compact.value ? el.scrollLeft : el.scrollLeft + el.clientWidth / 2;
let closest = 0;
let distance = Infinity;
Array.from(el.children).forEach((child, i) => {
const item = child as HTMLElement;
const point = compact.value ? item.offsetLeft : item.offsetLeft + item.offsetWidth / 2;
const next = Math.abs(point - reference);
if (next < distance) {
distance = next;
closest = i
}
});
index.value = closest
}
function move(direction: -1 | 1) {
const el = track.value;
if (!el) return;
const next = Math.max(0, Math.min(el.children.length - 1, index.value + direction));
const item = el.children[next] as HTMLElement;
index.value = next;
const centered = item.offsetLeft - (el.clientWidth - item.offsetWidth) / 2;
el.scrollTo({left: compact.value ? item.offsetLeft : centered, behavior: 'smooth'})
}
onMounted(() => {
observer = new ResizeObserver(updateOverflow);
if (track.value) observer.observe(track.value);
nextTick(updateOverflow)
});
onUpdated(() => nextTick(updateOverflow));
onBeforeUnmount(() => observer?.disconnect())
</script>
<template>
<div :class="$style.root">
<button v-show="canPrev" type="button" :class="[$style.arrow,$style.previous]"
:aria-label="`Faire défiler ${label} vers la gauche`" @click="move(-1)"><
</button>
<div ref="track" :class="[$style.track,compact&&$style.compact,trackClass]"
:role="role||(compact?'tablist':undefined)" @scrollend="updateIndex">
<slot/>
</div>
<button v-show="canNext" type="button" :class="[$style.arrow,$style.next]"
:aria-label="`Faire défiler ${label} vers la droite`" @click="move(1)">>
</button>
</div>
</template>
<style module>
.root {
position: relative;
min-width: 0
}
.track {
scroll-behavior: smooth;
scrollbar-width: none;
-ms-overflow-style: none;
touch-action: pan-x;
overscroll-behavior-inline: contain;
-webkit-overflow-scrolling: touch
}
.track::-webkit-scrollbar {
display: none
}
.arrow {
position: absolute;
z-index: 4;
top: 50%;
display: grid;
place-items: center;
width: 38px;
height: 38px;
padding: 0;
transform: translateY(-50%);
border: 1px solid var(--line);
border-radius: 50%;
background: var(--surface);
color: var(--text);
box-shadow: 0 3px 14px #0003;
cursor: pointer;
font-size: 20px
}
.previous {
left: 6px
}
.next {
right: 6px
}
@media (max-width: 1000px) {
.track {
display: flex !important;
gap: 1rem;
overflow-x: auto !important;
padding-inline: 1rem;
margin-inline: -1rem;
scroll-snap-type: x proximity;
scroll-padding-inline: 1rem
}
.track > * {
flex: 0 0 250px;
min-width: 250px;
scroll-snap-align: center
}
.track.compact > * {
flex-basis: auto;
min-width: max-content
}
}
</style>
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