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import { useCallback, useEffect, useMemo, useState } from 'react';
import { noop, off, on } from './misc/util';
export interface DropAreaState {
over: boolean;
}
export interface DropAreaBond {
onDragOver: React.DragEventHandler;
onDragEnter: React.DragEventHandler;
onDragLeave: React.DragEventHandler;
onDrop: React.DragEventHandler;
onPaste: React.ClipboardEventHandler;
}
export interface DropAreaOptions {
onFiles?: (files: File[], event?) => void;
onText?: (text: string, event?) => void;
onUri?: (url: string, event?) => void;
}
const createProcess = (options: DropAreaOptions) => (dataTransfer: DataTransfer, event) => {
const uri = dataTransfer.getData('text/uri-list');
if (uri) {
(options.onUri || noop)(uri, event);
return;
}
if (dataTransfer.files && dataTransfer.files.length) {
(options.onFiles || noop)(Array.from(dataTransfer.files), event);
return;
}
if (event.clipboardData) {
const text = event.clipboardData.getData('text');
(options.onText || noop)(text, event);
return;
}
};
const useDrop = (options: DropAreaOptions = {}, args = []): DropAreaState => {
const { onFiles, onText, onUri } = options;
const [over, setOverRaw] = useState<boolean>(false);
const setOver = useCallback(setOverRaw, []);
const process = useMemo(() => createProcess(options), [onFiles, onText, onUri]);
useEffect(() => {
const onDragOver = (event) => {
event.preventDefault();
setOver(true);
};
const onDragEnter = (event) => {
event.preventDefault();
setOver(true);
};
const onDragLeave = () => {
setOver(false);
};
const onDragExit = () => {
setOver(false);
};
const onDrop = (event) => {
event.preventDefault();
setOver(false);
process(event.dataTransfer, event);
};
const onPaste = (event) => {
process(event.clipboardData, event);
};
on(document, 'dragover', onDragOver);
on(document, 'dragenter', onDragEnter);
on(document, 'dragleave', onDragLeave);
on(document, 'dragexit', onDragExit);
on(document, 'drop', onDrop);
if (onText) {
on(document, 'paste', onPaste);
}
return () => {
off(document, 'dragover', onDragOver);
off(document, 'dragenter', onDragEnter);
off(document, 'dragleave', onDragLeave);
off(document, 'dragexit', onDragExit);
off(document, 'drop', onDrop);
off(document, 'paste', onPaste);
};
}, [process, ...args]);
return { over };
};
export default useDrop;
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