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<script lang="ts">
import type { Tab } from "../tabs";
import { isStuckToEnd } from "../tabs";
let {
tabs,
activeConversationId,
onSelect,
onClose,
onNewDraft,
}: {
tabs: readonly Tab[];
activeConversationId: string | null;
onSelect: (conversationId: string) => void;
onClose: (conversationId: string) => void;
onNewDraft: () => void;
} = $props();
// The new-chat button is `position: sticky; right: 0`. It floats over the tabs
// only while the strip overflows and isn't scrolled fully right; we square its
// right edge only in that "stuck" state. Pure decision (`isStuckToEnd`) +
// DOM-measurement at the edge here.
let scrollEl = $state<HTMLDivElement>();
let stuck = $state(false);
function recompute(): void {
const el = scrollEl;
if (el === undefined) {
stuck = false;
return;
}
stuck = isStuckToEnd({
scrollLeft: el.scrollLeft,
clientWidth: el.clientWidth,
scrollWidth: el.scrollWidth,
});
}
$effect(() => {
const el = scrollEl;
if (el === undefined) return;
// Re-evaluate when the tab set changes (overflow may appear/disappear).
void tabs;
recompute();
el.addEventListener("scroll", recompute, { passive: true });
const ro =
typeof ResizeObserver !== "undefined" ? new ResizeObserver(recompute) : undefined;
ro?.observe(el);
return () => {
el.removeEventListener("scroll", recompute);
ro?.disconnect();
};
});
</script>
<div bind:this={scrollEl} class="overflow-x-auto border-b border-base-300">
<div class="tabs tabs-border min-w-max">
{#each tabs as tab (tab.conversationId)}
<div
class="tab"
class:tab-active={tab.conversationId === activeConversationId}
role="tab"
tabindex="0"
onclick={() => onSelect(tab.conversationId)}
onkeydown={(e) => {
if (e.key === "Enter") onSelect(tab.conversationId);
}}
>
<span class="max-w-[120px] truncate">{tab.title}</span>
<button
class="btn btn-ghost btn-xs ml-1"
aria-label="Close tab"
onclick={(e) => {
e.stopPropagation();
onClose(tab.conversationId);
}}
>
×
</button>
</div>
{/each}
<button
class="tab sticky right-0 z-10 bg-base-200 shadow-[-2px_0_4px_-1px_rgba(0,0,0,0.2)] {stuck
? '!rounded-se-none !rounded-ee-none'
: ''}"
class:tab-active={activeConversationId === null}
aria-label="New chat"
onclick={() => onNewDraft()}
>
{#if activeConversationId === null}
<span class="max-w-[120px] truncate">New Chat</span>
<span class="btn btn-ghost btn-xs ml-1" aria-hidden="true">+</span>
{:else}
+
{/if}
</button>
</div>
</div>
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