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import { useMemo, useState } from 'react';
import useMountedState from './useMountedState';
import { noop } 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 defaultState: DropAreaState = {
over: false,
};
*/
const createProcess =
(options: DropAreaOptions, mounted: boolean) => (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 (dataTransfer.items && dataTransfer.items.length) {
dataTransfer.items[0].getAsString((text) => {
if (mounted) {
(options.onText || noop)(text, event);
}
});
}
};
const createBond = (process, setOver): DropAreaBond => ({
onDragOver: (event) => {
event.preventDefault();
},
onDragEnter: (event) => {
event.preventDefault();
setOver(true);
},
onDragLeave: () => {
setOver(false);
},
onDrop: (event) => {
event.preventDefault();
event.persist();
setOver(false);
process(event.dataTransfer, event);
},
onPaste: (event) => {
event.persist();
process(event.clipboardData, event);
},
});
const useDropArea = (options: DropAreaOptions = {}): [DropAreaBond, DropAreaState] => {
const { onFiles, onText, onUri } = options;
const isMounted = useMountedState();
const [over, setOver] = useState<boolean>(false);
const process = useMemo(() => createProcess(options, isMounted()), [onFiles, onText, onUri]);
const bond: DropAreaBond = useMemo(() => createBond(process, setOver), [process, setOver]);
return [bond, { over }];
};
export default useDropArea;
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