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index.js
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index.js
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/* eslint prefer-template: 0 */
import React, {
forwardRef,
Fragment,
useCallback,
useEffect,
useImperativeHandle,
useMemo,
useReducer,
useRef
} from 'react'
import PropTypes from 'prop-types'
import { fromEvent } from 'file-selector'
import {
allFilesAccepted,
composeEventHandlers,
fileAccepted,
fileMatchSize,
isEvtWithFiles,
isIeOrEdge,
isPropagationStopped,
onDocumentDragOver,
TOO_MANY_FILES_REJECTION
} from './utils/index'
/**
* Convenience wrapper component for the `useDropzone` hook
*
* ```jsx
* <Dropzone>
* {({getRootProps, getInputProps}) => (
* <div {...getRootProps()}>
* <input {...getInputProps()} />
* <p>Drag 'n' drop some files here, or click to select files</p>
* </div>
* )}
* </Dropzone>
* ```
*/
const Dropzone = forwardRef(({ children, ...params }, ref) => {
const { open, ...props } = useDropzone(params)
useImperativeHandle(ref, () => ({ open }), [open])
// TODO: Figure out why react-styleguidist cannot create docs if we don't return a jsx element
return <Fragment>{children({ ...props, open })}</Fragment>
})
Dropzone.displayName = 'Dropzone'
// Add default props for react-docgen
const defaultProps = {
disabled: false,
getFilesFromEvent: fromEvent,
maxSize: Infinity,
minSize: 0,
multiple: true,
maxFiles: 0,
preventDropOnDocument: true,
noClick: false,
noKeyboard: false,
noDrag: false,
noDragEventsBubbling: false,
validator: null
}
Dropzone.defaultProps = defaultProps
Dropzone.propTypes = {
/**
* Render function that exposes the dropzone state and prop getter fns
*
* @param {object} params
* @param {Function} params.getRootProps Returns the props you should apply to the root drop container you render
* @param {Function} params.getInputProps Returns the props you should apply to hidden file input you render
* @param {Function} params.open Open the native file selection dialog
* @param {boolean} params.isFocused Dropzone area is in focus
* @param {boolean} params.isFileDialogActive File dialog is opened
* @param {boolean} params.isDragActive Active drag is in progress
* @param {boolean} params.isDragAccept Dragged files are accepted
* @param {boolean} params.isDragReject Some dragged files are rejected
* @param {File[]} params.draggedFiles Files in active drag
* @param {File[]} params.acceptedFiles Accepted files
* @param {FileRejection[]} params.fileRejections Rejected files and why they were rejected
*/
children: PropTypes.func,
/**
* Set accepted file types.
* See https://github.com/okonet/attr-accept for more information.
* Keep in mind that mime type determination is not reliable across platforms. CSV files,
* for example, are reported as text/plain under macOS but as application/vnd.ms-excel under
* Windows. In some cases there might not be a mime type set at all.
* See: https://github.com/react-dropzone/react-dropzone/issues/276
*/
accept: PropTypes.oneOfType([PropTypes.string, PropTypes.arrayOf(PropTypes.string)]),
/**
* Allow drag 'n' drop (or selection from the file dialog) of multiple files
*/
multiple: PropTypes.bool,
/**
* If false, allow dropped items to take over the current browser window
*/
preventDropOnDocument: PropTypes.bool,
/**
* If true, disables click to open the native file selection dialog
*/
noClick: PropTypes.bool,
/**
* If true, disables SPACE/ENTER to open the native file selection dialog.
* Note that it also stops tracking the focus state.
*/
noKeyboard: PropTypes.bool,
/**
* If true, disables drag 'n' drop
*/
noDrag: PropTypes.bool,
/**
* If true, stops drag event propagation to parents
*/
noDragEventsBubbling: PropTypes.bool,
/**
* Minimum file size (in bytes)
*/
minSize: PropTypes.number,
/**
* Maximum file size (in bytes)
*/
maxSize: PropTypes.number,
/**
* Maximum accepted number of files
* The default value is 0 which means there is no limitation to how many files are accepted.
*/
maxFiles: PropTypes.number,
/**
* Enable/disable the dropzone
*/
disabled: PropTypes.bool,
/**
* Use this to provide a custom file aggregator
*
* @param {(DragEvent|Event)} event A drag event or input change event (if files were selected via the file dialog)
*/
getFilesFromEvent: PropTypes.func,
/**
* Cb for when closing the file dialog with no selection
*/
onFileDialogCancel: PropTypes.func,
/**
* Cb for when the `dragenter` event occurs.
*
* @param {DragEvent} event
*/
onDragEnter: PropTypes.func,
/**
* Cb for when the `dragleave` event occurs
*
* @param {DragEvent} event
*/
onDragLeave: PropTypes.func,
/**
* Cb for when the `dragover` event occurs
*
* @param {DragEvent} event
*/
onDragOver: PropTypes.func,
/**
* Cb for when the `drop` event occurs.
* Note that this callback is invoked after the `getFilesFromEvent` callback is done.
*
* Files are accepted or rejected based on the `accept`, `multiple`, `minSize` and `maxSize` props.
* `accept` must be a valid [MIME type](http://www.iana.org/assignments/media-types/media-types.xhtml) according to [input element specification](https://www.w3.org/wiki/HTML/Elements/input/file) or a valid file extension.
* If `multiple` is set to false and additional files are dropped,
* all files besides the first will be rejected.
* Any file which does not have a size in the [`minSize`, `maxSize`] range, will be rejected as well.
*
* Note that the `onDrop` callback will always be invoked regardless if the dropped files were accepted or rejected.
* If you'd like to react to a specific scenario, use the `onDropAccepted`/`onDropRejected` props.
*
* `onDrop` will provide you with an array of [File](https://developer.mozilla.org/en-US/docs/Web/API/File) objects which you can then process and send to a server.
* For example, with [SuperAgent](https://github.com/visionmedia/superagent) as a http/ajax library:
*
* ```js
* function onDrop(acceptedFiles) {
* const req = request.post('/upload')
* acceptedFiles.forEach(file => {
* req.attach(file.name, file)
* })
* req.end(callback)
* }
* ```
*
* @param {File[]} acceptedFiles
* @param {FileRejection[]} fileRejections
* @param {(DragEvent|Event)} event A drag event or input change event (if files were selected via the file dialog)
*/
onDrop: PropTypes.func,
/**
* Cb for when the `drop` event occurs.
* Note that if no files are accepted, this callback is not invoked.
*
* @param {File[]} files
* @param {(DragEvent|Event)} event
*/
onDropAccepted: PropTypes.func,
/**
* Cb for when the `drop` event occurs.
* Note that if no files are rejected, this callback is not invoked.
*
* @param {FileRejection[]} fileRejections
* @param {(DragEvent|Event)} event
*/
onDropRejected: PropTypes.func,
/**
* Custom validation function
* @param {File} file
* @returns {FileError|FileError[]}
*/
validator: PropTypes.func
}
export default Dropzone
/**
* A function that is invoked for the `dragenter`,
* `dragover` and `dragleave` events.
* It is not invoked if the items are not files (such as link, text, etc.).
*
* @callback dragCb
* @param {DragEvent} event
*/
/**
* A function that is invoked for the `drop` or input change event.
* It is not invoked if the items are not files (such as link, text, etc.).
*
* @callback dropCb
* @param {File[]} acceptedFiles List of accepted files
* @param {FileRejection[]} fileRejections List of rejected files and why they were rejected
* @param {(DragEvent|Event)} event A drag event or input change event (if files were selected via the file dialog)
*/
/**
* A function that is invoked for the `drop` or input change event.
* It is not invoked if the items are files (such as link, text, etc.).
*
* @callback dropAcceptedCb
* @param {File[]} files List of accepted files that meet the given criteria
* (`accept`, `multiple`, `minSize`, `maxSize`)
* @param {(DragEvent|Event)} event A drag event or input change event (if files were selected via the file dialog)
*/
/**
* A function that is invoked for the `drop` or input change event.
*
* @callback dropRejectedCb
* @param {File[]} files List of rejected files that do not meet the given criteria
* (`accept`, `multiple`, `minSize`, `maxSize`)
* @param {(DragEvent|Event)} event A drag event or input change event (if files were selected via the file dialog)
*/
/**
* A function that is used aggregate files,
* in a asynchronous fashion, from drag or input change events.
*
* @callback getFilesFromEvent
* @param {(DragEvent|Event)} event A drag event or input change event (if files were selected via the file dialog)
* @returns {(File[]|Promise<File[]>)}
*/
/**
* An object with the current dropzone state and some helper functions.
*
* @typedef {object} DropzoneState
* @property {Function} getRootProps Returns the props you should apply to the root drop container you render
* @property {Function} getInputProps Returns the props you should apply to hidden file input you render
* @property {Function} open Open the native file selection dialog
* @property {boolean} isFocused Dropzone area is in focus
* @property {boolean} isFileDialogActive File dialog is opened
* @property {boolean} isDragActive Active drag is in progress
* @property {boolean} isDragAccept Dragged files are accepted
* @property {boolean} isDragReject Some dragged files are rejected
* @property {File[]} draggedFiles Files in active drag
* @property {File[]} acceptedFiles Accepted files
* @property {FileRejection[]} fileRejections Rejected files and why they were rejected
*/
const initialState = {
isFocused: false,
isFileDialogActive: false,
isDragActive: false,
isDragAccept: false,
isDragReject: false,
draggedFiles: [],
acceptedFiles: [],
fileRejections: []
}
/**
* A React hook that creates a drag 'n' drop area.
*
* ```jsx
* function MyDropzone(props) {
* const {getRootProps, getInputProps} = useDropzone({
* onDrop: acceptedFiles => {
* // do something with the File objects, e.g. upload to some server
* }
* });
* return (
* <div {...getRootProps()}>
* <input {...getInputProps()} />
* <p>Drag and drop some files here, or click to select files</p>
* </div>
* )
* }
* ```
*
* @function useDropzone
*
* @param {object} props
* @param {string|string[]} [props.accept] Set accepted file types.
* See https://github.com/okonet/attr-accept for more information.
* Keep in mind that mime type determination is not reliable across platforms. CSV files,
* for example, are reported as text/plain under macOS but as application/vnd.ms-excel under
* Windows. In some cases there might not be a mime type set at all.
* See: https://github.com/react-dropzone/react-dropzone/issues/276
* @param {boolean} [props.multiple=true] Allow drag 'n' drop (or selection from the file dialog) of multiple files
* @param {boolean} [props.preventDropOnDocument=true] If false, allow dropped items to take over the current browser window
* @param {boolean} [props.noClick=false] If true, disables click to open the native file selection dialog
* @param {boolean} [props.noKeyboard=false] If true, disables SPACE/ENTER to open the native file selection dialog.
* Note that it also stops tracking the focus state.
* @param {boolean} [props.noDrag=false] If true, disables drag 'n' drop
* @param {boolean} [props.noDragEventsBubbling=false] If true, stops drag event propagation to parents
* @param {number} [props.minSize=0] Minimum file size (in bytes)
* @param {number} [props.maxSize=Infinity] Maximum file size (in bytes)
* @param {boolean} [props.disabled=false] Enable/disable the dropzone
* @param {getFilesFromEvent} [props.getFilesFromEvent] Use this to provide a custom file aggregator
* @param {Function} [props.onFileDialogCancel] Cb for when closing the file dialog with no selection
* @param {dragCb} [props.onDragEnter] Cb for when the `dragenter` event occurs.
* @param {dragCb} [props.onDragLeave] Cb for when the `dragleave` event occurs
* @param {dragCb} [props.onDragOver] Cb for when the `dragover` event occurs
* @param {dropCb} [props.onDrop] Cb for when the `drop` event occurs.
* Note that this callback is invoked after the `getFilesFromEvent` callback is done.
*
* Files are accepted or rejected based on the `accept`, `multiple`, `minSize` and `maxSize` props.
* `accept` must be a valid [MIME type](http://www.iana.org/assignments/media-types/media-types.xhtml) according to [input element specification](https://www.w3.org/wiki/HTML/Elements/input/file) or a valid file extension.
* If `multiple` is set to false and additional files are dropped,
* all files besides the first will be rejected.
* Any file which does not have a size in the [`minSize`, `maxSize`] range, will be rejected as well.
*
* Note that the `onDrop` callback will always be invoked regardless if the dropped files were accepted or rejected.
* If you'd like to react to a specific scenario, use the `onDropAccepted`/`onDropRejected` props.
*
* `onDrop` will provide you with an array of [File](https://developer.mozilla.org/en-US/docs/Web/API/File) objects which you can then process and send to a server.
* For example, with [SuperAgent](https://github.com/visionmedia/superagent) as a http/ajax library:
*
* ```js
* function onDrop(acceptedFiles) {
* const req = request.post('/upload')
* acceptedFiles.forEach(file => {
* req.attach(file.name, file)
* })
* req.end(callback)
* }
* ```
* @param {dropAcceptedCb} [props.onDropAccepted]
* @param {dropRejectedCb} [props.onDropRejected]
*
* @returns {DropzoneState}
*/
export function useDropzone(options = {}) {
const {
accept,
disabled,
getFilesFromEvent,
maxSize,
minSize,
multiple,
maxFiles,
onDragEnter,
onDragLeave,
onDragOver,
onDrop,
onDropAccepted,
onDropRejected,
onFileDialogCancel,
preventDropOnDocument,
noClick,
noKeyboard,
noDrag,
noDragEventsBubbling,
validator
} = {
...defaultProps,
...options
}
const rootRef = useRef(null)
const inputRef = useRef(null)
const [state, dispatch] = useReducer(reducer, initialState)
const { isFocused, isFileDialogActive, draggedFiles } = state
// Fn for opening the file dialog programmatically
const openFileDialog = useCallback(() => {
if (inputRef.current) {
dispatch({ type: 'openDialog' })
inputRef.current.value = null
inputRef.current.click()
}
}, [dispatch])
// Update file dialog active state when the window is focused on
const onWindowFocus = () => {
// Execute the timeout only if the file dialog is opened in the browser
if (isFileDialogActive) {
setTimeout(() => {
if (inputRef.current) {
const { files } = inputRef.current
if (!files.length) {
dispatch({ type: 'closeDialog' })
if (typeof onFileDialogCancel === 'function') {
onFileDialogCancel()
}
}
}
}, 300)
}
}
useEffect(() => {
window.addEventListener('focus', onWindowFocus, false)
return () => {
window.removeEventListener('focus', onWindowFocus, false)
}
}, [inputRef, isFileDialogActive, onFileDialogCancel])
// Cb to open the file dialog when SPACE/ENTER occurs on the dropzone
const onKeyDownCb = useCallback(
event => {
// Ignore keyboard events bubbling up the DOM tree
if (!rootRef.current || !rootRef.current.isEqualNode(event.target)) {
return
}
if (event.keyCode === 32 || event.keyCode === 13) {
event.preventDefault()
openFileDialog()
}
},
[rootRef, inputRef]
)
// Update focus state for the dropzone
const onFocusCb = useCallback(() => {
dispatch({ type: 'focus' })
}, [])
const onBlurCb = useCallback(() => {
dispatch({ type: 'blur' })
}, [])
// Cb to open the file dialog when click occurs on the dropzone
const onClickCb = useCallback(() => {
if (noClick) {
return
}
// In IE11/Edge the file-browser dialog is blocking, therefore, use setTimeout()
// to ensure React can handle state changes
// See: https://github.com/react-dropzone/react-dropzone/issues/450
if (isIeOrEdge()) {
setTimeout(openFileDialog, 0)
} else {
openFileDialog()
}
}, [inputRef, noClick])
const dragTargetsRef = useRef([])
const onDocumentDrop = event => {
if (rootRef.current && rootRef.current.contains(event.target)) {
// If we intercepted an event for our instance, let it propagate down to the instance's onDrop handler
return
}
event.preventDefault()
dragTargetsRef.current = []
}
useEffect(() => {
if (preventDropOnDocument) {
document.addEventListener('dragover', onDocumentDragOver, false)
document.addEventListener('drop', onDocumentDrop, false)
}
return () => {
if (preventDropOnDocument) {
document.removeEventListener('dragover', onDocumentDragOver)
document.removeEventListener('drop', onDocumentDrop)
}
}
}, [rootRef, preventDropOnDocument])
const onDragEnterCb = useCallback(
event => {
event.preventDefault()
// Persist here because we need the event later after getFilesFromEvent() is done
event.persist()
stopPropagation(event)
dragTargetsRef.current = [...dragTargetsRef.current, event.target]
if (isEvtWithFiles(event)) {
Promise.resolve(getFilesFromEvent(event)).then(draggedFiles => {
if (isPropagationStopped(event) && !noDragEventsBubbling) {
return
}
dispatch({
draggedFiles,
isDragActive: true,
type: 'setDraggedFiles'
})
if (onDragEnter) {
onDragEnter(event)
}
})
}
},
[getFilesFromEvent, onDragEnter, noDragEventsBubbling]
)
const onDragOverCb = useCallback(
event => {
event.preventDefault()
event.persist()
stopPropagation(event)
if (event.dataTransfer) {
try {
event.dataTransfer.dropEffect = 'copy'
} catch {} /* eslint-disable-line no-empty */
}
if (isEvtWithFiles(event) && onDragOver) {
onDragOver(event)
}
return false
},
[onDragOver, noDragEventsBubbling]
)
const onDragLeaveCb = useCallback(
event => {
event.preventDefault()
event.persist()
stopPropagation(event)
// Only deactivate once the dropzone and all children have been left
const targets = dragTargetsRef.current.filter(
target => rootRef.current && rootRef.current.contains(target)
)
// Make sure to remove a target present multiple times only once
// (Firefox may fire dragenter/dragleave multiple times on the same element)
const targetIdx = targets.indexOf(event.target)
if (targetIdx !== -1) {
targets.splice(targetIdx, 1)
}
dragTargetsRef.current = targets
if (targets.length > 0) {
return
}
dispatch({
isDragActive: false,
type: 'setDraggedFiles',
draggedFiles: []
})
if (isEvtWithFiles(event) && onDragLeave) {
onDragLeave(event)
}
},
[rootRef, onDragLeave, noDragEventsBubbling]
)
const onDropCb = useCallback(
event => {
event.preventDefault()
// Persist here because we need the event later after getFilesFromEvent() is done
event.persist()
stopPropagation(event)
dragTargetsRef.current = []
if (isEvtWithFiles(event)) {
Promise.resolve(getFilesFromEvent(event)).then(files => {
if (isPropagationStopped(event) && !noDragEventsBubbling) {
return
}
const acceptedFiles = []
const fileRejections = []
files.forEach(file => {
const [accepted, acceptError] = fileAccepted(file, accept)
const [sizeMatch, sizeError] = fileMatchSize(file, minSize, maxSize)
const customErrors = validator ? validator(file) : null;
if (accepted && sizeMatch && !customErrors) {
acceptedFiles.push(file)
} else {
let errors = [acceptError, sizeError];
if (customErrors) {
errors = errors.concat(customErrors);
}
fileRejections.push({ file, errors: errors.filter(e => e) })
}
})
if ((!multiple && acceptedFiles.length > 1) || (multiple && maxFiles >= 1 && acceptedFiles.length > maxFiles)) {
// Reject everything and empty accepted files
acceptedFiles.forEach(file => {
fileRejections.push({ file, errors: [TOO_MANY_FILES_REJECTION] })
})
acceptedFiles.splice(0)
}
dispatch({
acceptedFiles,
fileRejections,
type: 'setFiles'
})
if (onDrop) {
onDrop(acceptedFiles, fileRejections, event)
}
if (fileRejections.length > 0 && onDropRejected) {
onDropRejected(fileRejections, event)
}
if (acceptedFiles.length > 0 && onDropAccepted) {
onDropAccepted(acceptedFiles, event)
}
})
}
dispatch({ type: 'reset' })
},
[
multiple,
accept,
minSize,
maxSize,
maxFiles,
getFilesFromEvent,
onDrop,
onDropAccepted,
onDropRejected,
noDragEventsBubbling
]
)
const composeHandler = fn => {
return disabled ? null : fn
}
const composeKeyboardHandler = fn => {
return noKeyboard ? null : composeHandler(fn)
}
const composeDragHandler = fn => {
return noDrag ? null : composeHandler(fn)
}
const stopPropagation = event => {
if (noDragEventsBubbling) {
event.stopPropagation()
}
}
const getRootProps = useMemo(
() => ({
refKey = 'ref',
onKeyDown,
onFocus,
onBlur,
onClick,
onDragEnter,
onDragOver,
onDragLeave,
onDrop,
...rest
} = {}) => ({
onKeyDown: composeKeyboardHandler(composeEventHandlers(onKeyDown, onKeyDownCb)),
onFocus: composeKeyboardHandler(composeEventHandlers(onFocus, onFocusCb)),
onBlur: composeKeyboardHandler(composeEventHandlers(onBlur, onBlurCb)),
onClick: composeHandler(composeEventHandlers(onClick, onClickCb)),
onDragEnter: composeDragHandler(composeEventHandlers(onDragEnter, onDragEnterCb)),
onDragOver: composeDragHandler(composeEventHandlers(onDragOver, onDragOverCb)),
onDragLeave: composeDragHandler(composeEventHandlers(onDragLeave, onDragLeaveCb)),
onDrop: composeDragHandler(composeEventHandlers(onDrop, onDropCb)),
[refKey]: rootRef,
...(!disabled && !noKeyboard ? { tabIndex: 0 } : {}),
...rest
}),
[
rootRef,
onKeyDownCb,
onFocusCb,
onBlurCb,
onClickCb,
onDragEnterCb,
onDragOverCb,
onDragLeaveCb,
onDropCb,
noKeyboard,
noDrag,
disabled
]
)
const onInputElementClick = useCallback(event => {
event.stopPropagation()
}, [])
const getInputProps = useMemo(
() => ({ refKey = 'ref', onChange, onClick, ...rest } = {}) => {
const inputProps = {
accept,
multiple,
type: 'file',
style: { display: 'none' },
onChange: composeHandler(composeEventHandlers(onChange, onDropCb)),
onClick: composeHandler(composeEventHandlers(onClick, onInputElementClick)),
autoComplete: 'off',
tabIndex: -1,
[refKey]: inputRef
}
return {
...inputProps,
...rest
}
},
[inputRef, accept, multiple, onDropCb, disabled]
)
const fileCount = draggedFiles.length
const isDragAccept = fileCount > 0 && allFilesAccepted({ files: draggedFiles, accept, minSize, maxSize, multiple, maxFiles })
const isDragReject = fileCount > 0 && !isDragAccept
return {
...state,
isDragAccept,
isDragReject,
isFocused: isFocused && !disabled,
getRootProps,
getInputProps,
rootRef,
inputRef,
open: composeHandler(openFileDialog)
}
}
function reducer(state, action) {
/* istanbul ignore next */
switch (action.type) {
case 'focus':
return {
...state,
isFocused: true
}
case 'blur':
return {
...state,
isFocused: false
}
case 'openDialog':
return {
...state,
isFileDialogActive: true
}
case 'closeDialog':
return {
...state,
isFileDialogActive: false
}
case 'setDraggedFiles':
/* eslint no-case-declarations: 0 */
const { isDragActive, draggedFiles } = action
return {
...state,
draggedFiles,
isDragActive
}
case 'setFiles':
return {
...state,
acceptedFiles: action.acceptedFiles,
fileRejections: action.fileRejections
}
case 'reset':
return {
...state,
isFileDialogActive: false,
isDragActive: false,
draggedFiles: [],
acceptedFiles: [],
fileRejections: [],
}
default:
return state
}
}