File size: 4,242 Bytes
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import { afterNavigate } from '$app/navigation';
import { page } from '$app/state';
import { ChatForm } from '$lib/components/app';
import { useDraftMessages } from '$lib/hooks/use-draft-messages.svelte';
import { deviceStore } from '$lib/stores';
import { onMount } from 'svelte';
interface Props {
class?: string;
disabled?: boolean;
initialMessage?: string;
isLoading?: boolean;
onFileRemove?: (fileId: string) => void;
onFileUpload?: (files: File[]) => void;
onSend?: (message: string, files?: ChatUploadedFile[]) => Promise<boolean>;
onStop?: () => void;
onSystemPromptAdd?: (draft: { message: string; files: ChatUploadedFile[] }) => void;
uploadedFiles?: ChatUploadedFile[];
}
let {
class: className,
disabled = false,
initialMessage = '',
isLoading = false,
onFileRemove,
onFileUpload,
onSend,
onStop,
onSystemPromptAdd,
uploadedFiles = $bindable([])
}: Props = $props();
let chatFormRef: ChatForm | undefined = $state(undefined);
let formWrapperEl: HTMLDivElement | undefined = $state();
let chatId = $derived(page.params.id as string | undefined);
$effect(() => {
if (!formWrapperEl) return;
const formEl = formWrapperEl.querySelector('form') as HTMLElement | null;
if (!formEl) return;
const updateHeight = () => {
const height = Math.round(formEl.getBoundingClientRect().height);
document.documentElement.style.setProperty('--chat-form-height', `${height}px`);
};
updateHeight();
const resizeObserver = new ResizeObserver(updateHeight);
resizeObserver.observe(formEl);
return () => {
resizeObserver.disconnect();
document.documentElement.style.removeProperty('--chat-form-height');
};
});
let hasLoadingAttachments = $derived(uploadedFiles.some((f) => f.isLoading));
let message = $derived(initialMessage);
let previousIsLoading = $derived(isLoading);
let previousInitialMessage = $derived(initialMessage);
const { clearDraft } = useDraftMessages({
getChatId: () => chatId,
getFiles: () => uploadedFiles,
getInitialMessage: () => initialMessage,
getMessage: () => message,
setFiles: (f) => (uploadedFiles = f),
setMessage: (m) => (message = m)
});
function handleFilesAdd(files: File[]) {
onFileUpload?.(files);
}
async function handleSubmit() {
if ((!message.trim() && uploadedFiles.length === 0) || disabled || hasLoadingAttachments)
return;
if (!chatFormRef?.checkModelSelected()) return;
const messageToSend = message.trim();
const filesToSend = [...uploadedFiles];
message = '';
uploadedFiles = [];
clearDraft();
chatFormRef?.resetTextareaHeight();
const success = await onSend?.(messageToSend, filesToSend);
if (!success) {
message = messageToSend;
uploadedFiles = filesToSend;
}
}
function handleSystemPromptClick() {
onSystemPromptAdd?.({ files: uploadedFiles, message });
}
function handleUploadedFileRemove(fileId: string) {
onFileRemove?.(fileId);
}
// Auto-focus must not steal focus already claimed elsewhere (e.g. the system
// message editor opened just before a navigation)
function focusFormUnlessCaptured() {
const active = document.activeElement;
if (active instanceof HTMLTextAreaElement || active instanceof HTMLInputElement) return;
chatFormRef?.focus();
}
onMount(() => {
if (!deviceStore.isMobile) {
setTimeout(focusFormUnlessCaptured, 100);
}
});
afterNavigate((navigation) => {
if (navigation?.from != null && !deviceStore.isMobile) {
setTimeout(focusFormUnlessCaptured, 100);
}
});
$effect(() => {
if (initialMessage !== previousInitialMessage) {
message = initialMessage;
previousInitialMessage = initialMessage;
}
});
$effect(() => {
if (previousIsLoading && !isLoading) {
setTimeout(focusFormUnlessCaptured, 10);
}
previousIsLoading = isLoading;
});
</script>
<div bind:this={formWrapperEl} class="chat-screen-form-wrapper">
<ChatForm
bind:this={chatFormRef}
bind:uploadedFiles
bind:value={message}
class="mx-auto max-w-3xl {className}"
{disabled}
{isLoading}
onFilesAdd={handleFilesAdd}
{onStop}
onSubmit={handleSubmit}
onSystemPromptClick={handleSystemPromptClick}
onUploadedFileRemove={handleUploadedFileRemove}
/>
</div>
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