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use-dnd-layers.tsx
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use-dnd-layers.tsx
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import {useCallback, useState} from 'react';
import {useDispatch} from 'react-redux';
import {DragEndEvent, DragStartEvent} from '@dnd-kit/core';
import {layerConfigChange, reorderLayer, toggleLayerForMap} from '@kepler.gl/actions';
import {
DROPPABLE_MAP_CONTAINER_TYPE,
SORTABLE_LAYER_TYPE,
SORTABLE_SIDE_PANEL_TYPE
} from '@kepler.gl/constants';
import {reorderLayerOrder} from '@kepler.gl/reducers';
import {Layer} from '@kepler.gl/layers';
type DndEffectsHook = {
activeLayer: Layer | undefined;
onDragStart: (event: DragStartEvent) => void;
onDragEnd: (event: DragEndEvent) => void;
};
const useDndLayers: (layers: Layer[], layerOrder: string[]) => DndEffectsHook = (layers, layerOrder) => {
const dispatch = useDispatch();
const [activeLayer, setActiveLayer]: [activeEffect: Layer | undefined, setActiveEffect: (effect: Layer | undefined) => void] = useState();
const onDragStart = useCallback(
event => {
const {active} = event;
const newActiveLayer = layers.find(layer => layer.id === active.id);
if (newActiveLayer) {
setActiveLayer(newActiveLayer);
if (newActiveLayer?.config.isConfigActive) {
dispatch(layerConfigChange(newActiveLayer, {isConfigActive: false}));
}
}
},
[dispatch, layers]
);
const onDragEnd = useCallback(
event => {
const {active, over} = event;
const {id: activeLayerId} = active;
const overType = over?.data?.current?.type;
if (!overType) {
setActiveLayer(undefined);
return;
}
switch (overType) {
// moving layers into maps
case DROPPABLE_MAP_CONTAINER_TYPE:
const mapIndex = over.data.current?.index ?? 0;
dispatch(toggleLayerForMap(mapIndex, activeLayerId));
break;
// swaping layers
case SORTABLE_LAYER_TYPE:
const newLayerOrder = reorderLayerOrder(layerOrder, activeLayerId, over.id);
dispatch(reorderLayer(newLayerOrder));
break;
// moving layers within side panel
case SORTABLE_SIDE_PANEL_TYPE:
// move layer to the end of the list
dispatch(
reorderLayer(
reorderLayerOrder(layerOrder, activeLayerId, layerOrder[layerOrder.length - 1])
)
);
break;
default:
break;
}
setActiveLayer(undefined);
},
[dispatch, layerOrder]
);
return {activeLayer, onDragStart, onDragEnd};
};
export default useDndLayers;