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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import { useEffect, useRef, useState } from 'react';
import { c } from '../../helpers';
import type {
DragAndDropSorterProps,
InternalDraggableItem,
} from './DragAndDropSorterProps';
import styles from './DragAndDropSorter.module.css';
export default function DragAndDropSorter<T>({
draggable = true,
items,
onChange,
}: DragAndDropSorterProps<T>): JSX.Element {
const [draggableItems, setDraggableItems] = useState<
InternalDraggableItem<T>[]
>([]);
useEffect(() => {
setDraggableItems(
items.map(({ children, dataItem }, order) => ({
id: crypto.randomUUID(),
children,
dataItem,
order,
}))
);
}, [items]);
const dragElementRef = useRef<HTMLDivElement>();
const handleDragStart = (event: React.DragEvent<HTMLDivElement>): void => {
event.stopPropagation();
event.dataTransfer.effectAllowed = 'move';
const dragElement = event.target as HTMLDivElement;
dragElement.classList.add(styles.dragging);
dragElementRef.current = dragElement;
};
const handleDragOver = (event: React.DragEvent<HTMLDivElement>): void => {
event.preventDefault();
const dragOverElement = (
event.target as HTMLDivElement
).closest<HTMLDivElement>('[draggable="true"]');
if (
dragOverElement?.draggable &&
dragOverElement != dragElementRef.current
) {
dragOverElement.classList.add(styles.drag_over);
}
};
const handleDragLeave = (event: React.DragEvent<HTMLDivElement>): void => {
event.preventDefault();
const dragOverElement = event.target as HTMLDivElement;
if (dragOverElement.draggable) {
dragOverElement.classList.remove(styles.drag_over);
}
};
const handleDragEnd = (event: React.DragEvent<HTMLDivElement>): void => {
event.stopPropagation();
const dragElement = event.target as HTMLDivElement;
dragElement.classList.remove(styles.dragging);
dragElementRef.current = undefined;
};
const handleDrop = (event: React.DragEvent<HTMLDivElement>): void => {
event.stopPropagation();
const dropElement = event.target as HTMLDivElement;
dropElement.classList.remove(styles.drag_over);
const itemId = dropElement.id;
const dragItemId = dragElementRef.current?.id;
if (itemId === dragItemId) {
return;
}
if (dropElement.draggable && dragElementRef.current) {
const draggingItem = draggableItems.find(item => item.id === dragItemId);
const newDraggableItems = draggableItems.reduce<
InternalDraggableItem<T>[]
>((newItems, item) => {
if (item.id === dragItemId) {
return newItems;
}
const order = newItems.length;
if (item.id === itemId && draggingItem) {
const isGoingDown = draggingItem.order > item.order;
const upElement = isGoingDown ? draggingItem : item;
const downElement = isGoingDown ? item : draggingItem;
return [
...newItems,
{ ...upElement, order },
{ ...downElement, order: order + 1 },
];
}
return [...newItems, { ...item, order }];
}, []);
setDraggableItems(newDraggableItems);
const sortedDraggableItems = newDraggableItems.map(
({ dataItem, order }) => ({ dataItem, order })
);
onChange?.(sortedDraggableItems);
}
};
return (
<div className={c(styles.wrapper)}>
{draggableItems.map(({ id, children }) => (
<div
className={c(styles.draggable)}
draggable={items.length > 1 && draggable}
id={id}
key={id}
onDragEnd={handleDragEnd}
onDragLeave={handleDragLeave}
onDragOver={handleDragOver}
onDragStart={handleDragStart}
onDrop={handleDrop}
>
{children}
</div>
))}
</div>
);
}
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