File upload

npm install react-aria-components

"use client";

import type { ReactNode } from "react";
import { Button, DropZone, FileTrigger, Text, type FileTriggerProps } from "react-aria-components";

const styles = {
  root: "flex w-full flex-col items-center gap-(--tui-file-upload-gap) rounded-(--tui-file-upload-radius) border-(length:--tui-file-upload-border-width) border-(--tui-file-upload-border) bg-(--tui-file-upload-bg) p-(--tui-file-upload-padding) text-center font-(family-name:--tui-font) text-(length:--tui-file-upload-font-size) transition-colors duration-(--tui-duration) [border-style:var(--tui-file-upload-border-style)] data-drop-target:border-(--tui-file-upload-drop-border) data-drop-target:bg-(--tui-file-upload-drop-bg) data-focus-visible:[outline:2px_solid_var(--tui-ring)]",
  icon: "flex size-(--tui-file-upload-icon-size) items-center justify-center rounded-[calc(var(--tui-file-upload-radius)_*_0.6)] border-solid border-(length:--tui-file-upload-border-width) border-(--tui-file-upload-border) bg-(--tui-file-upload-icon-bg) text-(--tui-file-upload-icon-fg)",
  link: "cursor-default rounded-[4px] border-none bg-transparent p-0 font-(family-name:--tui-font) text-(length:--tui-file-upload-font-size) font-semibold text-(--tui-file-upload-link) outline-none data-focus-visible:[outline:2px_solid_var(--tui-ring)] data-focus-visible:[outline-offset:2px] data-hovered:underline",
};

export interface FileUploadProps extends Pick<FileTriggerProps, "acceptedFileTypes" | "allowsMultiple"> {
  /** Called with the files, whether they were picked or dropped. */
  onSelect: (files: File[]) => void;
  /** What the button says. */
  action?: ReactNode;
  /** What follows it. */
  prompt?: ReactNode;
  /** A line about what is accepted. */
  hint?: ReactNode;
  className?: string;
}

/** A place to drop files, with a button for picking them instead. */
export function FileUpload({ onSelect, action = "Click to upload", prompt = "or drag and drop", hint, acceptedFileTypes, allowsMultiple, className }: FileUploadProps) {
  return (
    <DropZone
      data-slot="file-upload"
      className={[styles.root, className].filter(Boolean).join(" ")}
      onDrop={async (event) => {
        const files = await Promise.all(event.items.filter((item) => item.kind === "file").map((item) => (item as { getFile: () => Promise<File> }).getFile()));
        if (files.length) onSelect(files);
      }}
    >
      <span aria-hidden className={styles.icon}>
        <svg viewBox="0 0 16 16" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" className="size-[50%]">
          <path d="M8 10.500V3.500M5 6l3-3 3 3M3 10.500v1A1.500 1.500 0 0 0 4.500 13h7a1.500 1.500 0 0 0 1.500-1.500v-1" />
        </svg>
      </span>
      <div className="flex flex-col gap-1">
        <Text slot="label" className="leading-snug text-(--tui-file-upload-fg)">
          <FileTrigger acceptedFileTypes={acceptedFileTypes} allowsMultiple={allowsMultiple} onSelect={(list) => list && onSelect([...list])}>
            <Button className={styles.link}>{action}</Button>
          </FileTrigger>{" "}
          {prompt}
        </Text>
        {hint && <span className="text-[0.92em] leading-snug text-(--tui-file-upload-muted)">{hint}</span>}
      </div>
    </DropZone>
  );
}

:root {
  color-scheme: light;
  --tui-bg: #ffffff;
  --tui-fg: #0a0a0a;
  --tui-muted: #f5f5f5;
  --tui-muted-fg: #737373;
  --tui-border: #e5e5e5;
  --tui-primary: #171717;
  --tui-primary-fg: #fafafa;
  --tui-ring: #a3a3a3;
  --tui-success: #16a34a;
  --tui-warning: #d97706;
  --tui-danger: #dc2626;
  --tui-radius: 8px;
  --tui-border-width: 1px;
  --tui-space: 4px;
  --tui-shadow: none;
  --tui-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --tui-text: 14px;
  --tui-duration: 150ms;

  /* File upload */
  --tui-file-upload-padding: calc(var(--tui-space) * 6);
  --tui-file-upload-gap: calc(var(--tui-space) * 3);
  --tui-file-upload-icon-size: calc(var(--tui-space) * 10);
  --tui-file-upload-radius: calc(var(--tui-radius) * 1.5);
  --tui-file-upload-border-width: var(--tui-border-width);
  --tui-file-upload-border-style: dashed;
  --tui-file-upload-font-size: var(--tui-text);
  --tui-file-upload-bg: var(--tui-bg);
  --tui-file-upload-fg: var(--tui-muted-fg);
  --tui-file-upload-muted: var(--tui-muted-fg);
  --tui-file-upload-link: var(--tui-fg);
  --tui-file-upload-border: var(--tui-border);
  --tui-file-upload-icon-bg: var(--tui-bg);
  --tui-file-upload-icon-fg: var(--tui-fg);
  --tui-file-upload-drop-bg: color-mix(in oklab, var(--tui-primary) 6%, var(--tui-bg));
  --tui-file-upload-drop-border: var(--tui-primary);
}

.dark,
[data-theme="dark"] {
  color-scheme: dark;
  --tui-bg: #0a0a0a;
  --tui-fg: #fafafa;
  --tui-muted: #1c1c1c;
  --tui-muted-fg: #a3a3a3;
  --tui-border: #2a2a2a;
  --tui-primary: #fafafa;
  --tui-primary-fg: #171717;
  --tui-ring: #737373;
  --tui-success: #22c55e;
  --tui-warning: #f59e0b;
  --tui-danger: #ef4444;
}