98 lines
2.5 KiB
JavaScript
98 lines
2.5 KiB
JavaScript
import React from 'react';
|
|
|
|
const LISTENER = {
|
|
ADD: 'add',
|
|
REMOVE: 'remove',
|
|
};
|
|
|
|
const DRAG_TYPES = {
|
|
END: 'dragend',
|
|
START: 'dragstart',
|
|
ENTER: 'dragenter',
|
|
LEAVE: 'dragleave',
|
|
};
|
|
|
|
const DRAG_SCORE = {
|
|
[DRAG_TYPES.ENTER]: 1,
|
|
[DRAG_TYPES.LEAVE]: -1,
|
|
};
|
|
|
|
const DRAG_STATE = {
|
|
[DRAG_TYPES.END]: false,
|
|
[DRAG_TYPES.START]: true,
|
|
};
|
|
|
|
// Returns simple detection for global drag-drop
|
|
export default function useFetched() {
|
|
const [drag, setDrag] = React.useState(false);
|
|
const [dropData, setDropData] = React.useState(null);
|
|
|
|
React.useEffect(() => {
|
|
let dragCount = 0;
|
|
let draggingElement = false;
|
|
|
|
// Handle file drop
|
|
const handleDropEvent = event => {
|
|
// Ignore non file types ( html elements / text )
|
|
if (!draggingElement) {
|
|
event.stopPropagation();
|
|
event.preventDefault();
|
|
// Get files
|
|
const files = event.dataTransfer.files;
|
|
// Check for files
|
|
if (files.length > 0) {
|
|
setDropData(event.dataTransfer);
|
|
}
|
|
}
|
|
// Reset state ( hide drop zone )
|
|
dragCount = 0;
|
|
setDrag(false);
|
|
};
|
|
|
|
// Drag event for non files type ( html elements / text )
|
|
const handleDragElementEvent = event => {
|
|
draggingElement = DRAG_STATE[event.type];
|
|
};
|
|
|
|
// Drag events
|
|
const handleDragEvent = event => {
|
|
event.stopPropagation();
|
|
event.preventDefault();
|
|
// Prevent multiple drop areas
|
|
dragCount += DRAG_SCORE[event.type];
|
|
// Dragged file enters the drop area
|
|
if (dragCount === 1 && !draggingElement && event.type === DRAG_TYPES.ENTER) {
|
|
setDrag(true);
|
|
}
|
|
// Dragged file leaves the drop area
|
|
if (dragCount === 0 && event.type === DRAG_TYPES.LEAVE) {
|
|
setDrag(false);
|
|
}
|
|
};
|
|
|
|
// Register / Unregister listeners
|
|
const handleEventListeners = event => {
|
|
const action = `${event}EventListener`;
|
|
// Handle drop event
|
|
document[action]('drop', handleDropEvent);
|
|
// Handle drag events
|
|
document[action](DRAG_TYPES.ENTER, handleDragEvent);
|
|
document[action](DRAG_TYPES.LEAVE, handleDragEvent);
|
|
// Handle non files drag events
|
|
document[action](DRAG_TYPES.END, handleDragElementEvent);
|
|
document[action](DRAG_TYPES.START, handleDragElementEvent);
|
|
};
|
|
// On component mounted:
|
|
// Register event listeners
|
|
handleEventListeners(LISTENER.ADD);
|
|
|
|
// On component unmounted:
|
|
return () => {
|
|
// Unregister event listeners
|
|
handleEventListeners(LISTENER.REMOVE);
|
|
};
|
|
}, []);
|
|
|
|
return { drag, dropData };
|
|
}
|