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| /* eslint prefer-template: 0 */
import React from 'react';
import PropTypes from 'prop-types';
import accepts from 'attr-accept';
import getDataTransferItems from './getDataTransferItems';
const supportMultiple = (typeof document !== 'undefined' && document && document.createElement) ?
'multiple' in document.createElement('input') :
true;
class Dropzone extends React.Component {
static onDocumentDragOver(e) {
// allow the entire document to be a drag target
e.preventDefault();
}
constructor(props, context) {
super(props, context);
this.onClick = this.onClick.bind(this);
this.onDocumentDrop = this.onDocumentDrop.bind(this);
this.onDragStart = this.onDragStart.bind(this);
this.onDragEnter = this.onDragEnter.bind(this);
this.onDragLeave = this.onDragLeave.bind(this);
this.onDragOver = this.onDragOver.bind(this);
this.onDrop = this.onDrop.bind(this);
this.onFileDialogCancel = this.onFileDialogCancel.bind(this);
this.fileAccepted = this.fileAccepted.bind(this);
this.setRef = this.setRef.bind(this);
this.isFileDialogActive = false;
this.state = {
isDragActive: false,
acceptedFiles: [],
rejectedFiles: []
};
}
componentDidMount() {
const { preventDropOnDocument } = this.props;
this.dragTargets = [];
if (preventDropOnDocument) {
document.addEventListener('dragover', Dropzone.onDocumentDragOver, false);
document.addEventListener('drop', this.onDocumentDrop, false);
}
// Tried implementing addEventListener, but didn't work out
document.body.onfocus = this.onFileDialogCancel;
}
componentWillUnmount() {
const { preventDropOnDocument } = this.props;
if (preventDropOnDocument) {
document.removeEventListener('dragover', Dropzone.onDocumentDragOver);
document.removeEventListener('drop', this.onDocumentDrop);
}
// Can be replaced with removeEventListener, if addEventListener works
document.body.onfocus = null;
}
onDocumentDrop(e) {
if (this.node.contains(e.target)) {
// if we intercepted an event for our instance, let it propagate down to the instance's onDrop handler
return;
}
e.preventDefault();
this.dragTargets = [];
}
onDragStart(e) {
Eif (this.props.onDragStart) {
this.props.onDragStart.call(this, e);
}
}
onDragEnter(e) {
e.preventDefault();
// Count the dropzone and any children that are entered.
if (this.dragTargets.indexOf(e.target) === -1) {
this.dragTargets.push(e.target);
}
const allFilesAccepted = this.allFilesAccepted(getDataTransferItems(e, this.props.multiple));
this.setState({
isDragActive: allFilesAccepted,
isDragReject: !allFilesAccepted
});
if (this.props.onDragEnter) {
this.props.onDragEnter.call(this, e);
}
}
onDragOver(e) { // eslint-disable-line class-methods-use-this
e.preventDefault();
e.stopPropagation();
try {
e.dataTransfer.dropEffect = 'copy'; // eslint-disable-line no-param-reassign
} catch (err) {
// continue regardless of error
}
if (this.props.onDragOver) {
this.props.onDragOver.call(this, e);
}
return false;
}
onDragLeave(e) {
e.preventDefault();
// Only deactivate once the dropzone and all children have been left.
this.dragTargets = this.dragTargets.filter(el => el !== e.target && this.node.contains(el));
Iif (this.dragTargets.length > 0) {
return;
}
this.setState({
isDragActive: false,
isDragReject: false
});
if (this.props.onDragLeave) {
this.props.onDragLeave.call(this, e);
}
}
onDrop(e) {
const { onDrop, onDropAccepted, onDropRejected, multiple, disablePreview } = this.props;
const fileList = getDataTransferItems(e, multiple);
const acceptedFiles = [];
const rejectedFiles = [];
// Stop default browser behavior
e.preventDefault();
// Reset the counter along with the drag on a drop.
this.dragTargets = [];
this.isFileDialogActive = false;
fileList.forEach((file) => {
if (!disablePreview) {
try {
file.preview = window.URL.createObjectURL(file); // eslint-disable-line no-param-reassign
} catch (err) {
Eif (process.env.NODE_ENV !== 'production') {
console.error('Failed to generate preview for file', file, err); // eslint-disable-line no-console
}
}
}
if (this.fileAccepted(file) && this.fileMatchSize(file)) {
acceptedFiles.push(file);
} else {
rejectedFiles.push(file);
}
});
if (onDrop) {
onDrop.call(this, acceptedFiles, rejectedFiles, e);
}
if (rejectedFiles.length > 0 && onDropRejected) {
onDropRejected.call(this, rejectedFiles, e);
}
if (acceptedFiles.length > 0 && onDropAccepted) {
onDropAccepted.call(this, acceptedFiles, e);
}
// Reset drag state
this.setState({
isDragActive: false,
isDragReject: false,
acceptedFiles,
rejectedFiles
});
}
onClick(e) {
const { onClick, disableClick } = this.props;
if (!disableClick) {
e.stopPropagation();
this.open();
if (onClick) {
onClick.call(this, e);
}
}
}
onFileDialogCancel() {
// timeout will not recognize context of this method
const { onFileDialogCancel } = this.props;
const { fileInputEl } = this;
let { isFileDialogActive } = this;
// execute the timeout only if the onFileDialogCancel is defined and FileDialog
// is opened in the browser
if (onFileDialogCancel && isFileDialogActive) {
setTimeout(() => {
// Returns an object as FileList
const FileList = fileInputEl.files;
Eif (!FileList.length) {
isFileDialogActive = false;
onFileDialogCancel();
}
}, 300);
}
}
setRef(ref) {
this.node = ref;
}
fileAccepted(file) {
// Firefox versions prior to 53 return a bogus MIME type for every file drag, so dragovers with
// that MIME type will always be accepted
return file.type === 'application/x-moz-file' || accepts(file, this.props.accept);
}
fileMatchSize(file) {
return file.size <= this.props.maxSize && file.size >= this.props.minSize;
}
allFilesAccepted(files) {
return files.every(this.fileAccepted);
}
open() {
this.isFileDialogActive = true;
this.fileInputEl.value = null;
this.fileInputEl.click();
}
renderChildren = (children) => {
if (typeof children === 'function') {
return children(this.state);
}
return children;
}
render() {
const {
accept,
activeClassName,
inputProps,
multiple,
name,
rejectClassName,
children,
...rest
} = this.props;
let {
activeStyle,
className,
rejectStyle,
style,
...props // eslint-disable-line prefer-const
} = rest;
const { isDragActive, isDragReject } = this.state;
className = className || '';
Iif (isDragActive && activeClassName) {
className += ' ' + activeClassName;
}
Iif (isDragReject && rejectClassName) {
className += ' ' + rejectClassName;
}
if (!className && !style && !activeStyle && !rejectStyle) {
style = {
width: 200,
height: 200,
borderWidth: 2,
borderColor: '#666',
borderStyle: 'dashed',
borderRadius: 5
};
activeStyle = {
borderStyle: 'solid',
backgroundColor: '#eee'
};
rejectStyle = {
borderStyle: 'solid',
backgroundColor: '#ffdddd'
};
}
let appliedStyle;
if (activeStyle && isDragActive) {
appliedStyle = {
...style,
...activeStyle
};
} else if (rejectStyle && isDragReject) {
appliedStyle = {
...style,
...rejectStyle
};
} else {
appliedStyle = {
...style
};
}
const inputAttributes = {
accept,
type: 'file',
style: { display: 'none' },
multiple: supportMultiple && multiple,
ref: el => this.fileInputEl = el, // eslint-disable-line
onChange: this.onDrop
};
if (name && name.length) {
inputAttributes.name = name;
}
// Remove custom properties before passing them to the wrapper div element
const customProps = [
'acceptedFiles',
'preventDropOnDocument',
'disablePreview',
'disableClick',
'onDropAccepted',
'onDropRejected',
'onFileDialogCancel',
'maxSize',
'minSize'
];
const divProps = { ...props };
customProps.forEach(prop => delete divProps[prop]);
return (
<div
className={className}
style={appliedStyle}
{...divProps/* expand user provided props first so event handlers are never overridden */}
onClick={this.onClick}
onDragStart={this.onDragStart}
onDragEnter={this.onDragEnter}
onDragOver={this.onDragOver}
onDragLeave={this.onDragLeave}
onDrop={this.onDrop}
ref={this.setRef}
>
{this.renderChildren(children)}
<input
{...inputProps/* expand user provided inputProps first so inputAttributes override them */}
{...inputAttributes}
/>
</div>
);
}
}
Dropzone.defaultProps = {
preventDropOnDocument: true,
disablePreview: false,
disableClick: false,
multiple: true,
maxSize: Infinity,
minSize: 0
};
Dropzone.propTypes = {
onClick: PropTypes.func,
onDrop: PropTypes.func,
onDropAccepted: PropTypes.func,
onDropRejected: PropTypes.func,
onDragStart: PropTypes.func,
onDragEnter: PropTypes.func,
onDragOver: PropTypes.func,
onDragLeave: PropTypes.func,
children: PropTypes.oneOfType([
PropTypes.node,
PropTypes.func
]), // Contents of the dropzone
style: PropTypes.object, // CSS styles to apply
activeStyle: PropTypes.object, // CSS styles to apply when drop will be accepted
rejectStyle: PropTypes.object, // CSS styles to apply when drop will be rejected
className: PropTypes.string, // Optional className
activeClassName: PropTypes.string, // className for accepted state
rejectClassName: PropTypes.string, // className for rejected state
preventDropOnDocument: PropTypes.bool, // If false, allow dropped items to take over the current browser window
disablePreview: PropTypes.bool, // Enable/disable preview generation
disableClick: PropTypes.bool, // Disallow clicking on the dropzone container to open file dialog
onFileDialogCancel: PropTypes.func, // Provide a callback on clicking the cancel button of the file dialog
inputProps: PropTypes.object, // Pass additional attributes to the <input type="file"/> tag
multiple: PropTypes.bool, // Allow dropping multiple files
accept: PropTypes.string, // Allow specific types of files. See https://github.com/okonet/attr-accept for more information
name: PropTypes.string, // name attribute for the input tag
maxSize: PropTypes.number,
minSize: PropTypes.number
};
export default Dropzone;
|