dify/web/app/components/base/app-icon-picker/hooks.tsx

import { useCallback, useState } from 'react'

export const useDraggableUploader = <T extends HTMLElement>(setImageFn: (file: File) => void) => {
  const [isDragActive, setIsDragActive] = useState(false)

  const handleDragEnter = useCallback((e: React.DragEvent<T>) => {
    e.preventDefault()
    e.stopPropagation()
    setIsDragActive(true)
  }, [])

  const handleDragOver = useCallback((e: React.DragEvent<T>) => {
    e.preventDefault()
    e.stopPropagation()
  }, [])

  const handleDragLeave = useCallback((e: React.DragEvent<T>) => {
    e.preventDefault()
    e.stopPropagation()
    setIsDragActive(false)
  }, [])

  const handleDrop = useCallback((e: React.DragEvent<T>) => {
    e.preventDefault()
    e.stopPropagation()
    setIsDragActive(false)

    const file = e.dataTransfer.files[0]

    if (!file)
      return

    setImageFn(file)
  }, [setImageFn])

  return {
    handleDragEnter,
    handleDragOver,
    handleDragLeave,
    handleDrop,
    isDragActive,
  }
}