ComfyUI_frontend/src/utils/eventUtils.ts

export async function extractFilesFromDragEvent(
  event: DragEvent
): Promise<File[]> {
  if (!event.dataTransfer) return []

  // Dragging from Chrome->Firefox there is a file but its a bmp, so ignore that
  const files = Array.from(event.dataTransfer.files).filter(
    (file) => file.type !== 'image/bmp'
  )

  if (files.length > 0) return files

  // Try loading the first URI in the transfer list
  const validTypes = ['text/uri-list', 'text/x-moz-url']
  const match = [...event.dataTransfer.types].find((t) =>
    validTypes.includes(t)
  )
  if (!match) return []

  const uri = event.dataTransfer.getData(match)?.split('\n')?.[0]
  if (!uri) return []

  const response = await fetch(uri)
  const blob = await response.blob()
  return [new File([blob], uri, { type: blob.type })]
}

export function hasImageType({ type }: File): boolean {
  return type.startsWith('image')
}

export function hasAudioType({ type }: File): boolean {
  return type.startsWith('audio')
}