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<script lang="ts">
import { createEventDispatcher, onMount } from "svelte";
export let value = "";
export let minRows = 1;
export let maxRows: null | number = null;
export let placeholder = "";
export let disabled = false;
// Approximate width from which we disable autofocus
const TABLET_VIEWPORT_WIDTH = 768;
let innerWidth = 0;
let textareaElement: HTMLTextAreaElement;
const dispatch = createEventDispatcher<{ submit: void }>();
$: minHeight = `${1 + minRows * 1.5}em`;
$: maxHeight = maxRows ? `${1 + maxRows * 1.5}em` : `auto`;
function handleKeydown(event: KeyboardEvent) {
// submit on enter
if (event.key === "Enter" && !event.shiftKey) {
event.preventDefault();
dispatch("submit"); // use a custom event instead of `event.target.form.requestSubmit()` as it does not work on Safari 14
}
}
onMount(() => {
if (innerWidth > TABLET_VIEWPORT_WIDTH) {
textareaElement.focus();
}
});
</script>
<svelte:window bind:innerWidth />
<div class="relative min-w-0 flex-1">
<pre
class="invisible whitespace-pre-wrap p-3"
aria-hidden="true"
style="min-height: {minHeight}; max-height: {maxHeight}">{(value || " ") + "\n"}</pre>
<textarea
enterkeyhint="send"
tabindex="0"
rows="1"
class="scrollbar-custom absolute top-0 m-0 h-full w-full resize-none scroll-p-3 overflow-x-hidden overflow-y-scroll border-0 bg-transparent p-3 outline-none focus:ring-0 focus-visible:ring-0"
bind:value
bind:this={textareaElement}
{disabled}
on:keydown={handleKeydown}
{placeholder}
/>
</div>
<style>
pre,
textarea {
font-family: inherit;
box-sizing: border-box;
line-height: 1.5;
}
</style>
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