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Clauderic Demers
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Original file line number | Diff line number | Diff line change |
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@@ -1,14 +1,8 @@ | ||
export { | ||
ActiveDraggableContext, | ||
DndContext, | ||
LayoutMeasuringStrategy, | ||
LayoutMeasuringFrequency, | ||
} from './DndContext'; | ||
export {ActiveDraggableContext, DndContext} from './DndContext'; | ||
export type { | ||
CancelDrop, | ||
DragStartEvent, | ||
DragMoveEvent, | ||
DragOverEvent, | ||
DragEndEvent, | ||
LayoutMeasuring, | ||
} from './DndContext'; |
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154 changes: 154 additions & 0 deletions
154
packages/core/src/hooks/utilities/useLayoutMeasuring.ts
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Original file line number | Diff line number | Diff line change |
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import {useCallback, useEffect, useRef, useState} from 'react'; | ||
import {useLazyMemo, useIsomorphicLayoutEffect} from '@dnd-kit/utilities'; | ||
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import {getElementLayout} from '../../utilities'; | ||
import type {DroppableContainers, LayoutRectMap} from '../../store/types'; | ||
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interface Arguments { | ||
dragging: boolean; | ||
dependencies: any[]; | ||
config: Partial<LayoutMeasuring> | undefined; | ||
} | ||
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export enum LayoutMeasuringStrategy { | ||
Always = 'always', | ||
WhileDragging = 'while-dragging', | ||
} | ||
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export enum LayoutMeasuringFrequency { | ||
Optimized = 'optimized', | ||
} | ||
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export interface LayoutMeasuring { | ||
strategy: LayoutMeasuringStrategy; | ||
frequency: LayoutMeasuringFrequency | number; | ||
} | ||
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const defaultValue: LayoutRectMap = new Map(); | ||
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export function useLayoutMeasuring( | ||
containers: DroppableContainers, | ||
{dragging, dependencies, config}: Arguments | ||
) { | ||
const [willRecomputeLayouts, setWillRecomputeLayouts] = useState(false); | ||
const {frequency, strategy} = getLayoutMeasuring(config); | ||
const containersRef = useRef(containers); | ||
const recomputeLayouts = useCallback(() => { | ||
setWillRecomputeLayouts(true); | ||
}, []); | ||
const recomputeLayoutsTimeoutId = useRef<NodeJS.Timeout | null>(null); | ||
const disabled = | ||
strategy === LayoutMeasuringStrategy.Always ? false : !dragging; | ||
const layoutRectMap = useLazyMemo<LayoutRectMap>( | ||
(previousValue) => { | ||
if (disabled) { | ||
return defaultValue; | ||
} | ||
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if ( | ||
!previousValue || | ||
previousValue === defaultValue || | ||
containersRef.current !== containers || | ||
willRecomputeLayouts | ||
) { | ||
for (let container of Object.values(containers)) { | ||
if (!container) { | ||
continue; | ||
} | ||
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container.rect.current = container.node.current | ||
? getElementLayout(container.node.current) | ||
: null; | ||
} | ||
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return createLayoutRectMap(containers); | ||
} | ||
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return previousValue; | ||
}, | ||
[containers, disabled, willRecomputeLayouts] | ||
); | ||
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useEffect(() => { | ||
containersRef.current = containers; | ||
}, [containers]); | ||
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useEffect(() => { | ||
if (willRecomputeLayouts) { | ||
setWillRecomputeLayouts(false); | ||
} | ||
}, [willRecomputeLayouts]); | ||
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useIsomorphicLayoutEffect( | ||
function recompute() { | ||
if (disabled) { | ||
return; | ||
} | ||
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requestAnimationFrame(() => recomputeLayouts()); | ||
}, | ||
// eslint-disable-next-line react-hooks/exhaustive-deps | ||
[dragging, disabled] | ||
); | ||
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useEffect( | ||
function forceRecomputeLayouts() { | ||
if ( | ||
disabled || | ||
typeof frequency !== 'number' || | ||
recomputeLayoutsTimeoutId.current !== null | ||
) { | ||
return; | ||
} | ||
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recomputeLayoutsTimeoutId.current = setTimeout(() => { | ||
recomputeLayouts(); | ||
recomputeLayoutsTimeoutId.current = null; | ||
}, frequency); | ||
}, | ||
// eslint-disable-next-line react-hooks/exhaustive-deps | ||
[frequency, disabled, recomputeLayouts, ...dependencies] | ||
); | ||
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return {layoutRectMap, recomputeLayouts, willRecomputeLayouts}; | ||
} | ||
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function createLayoutRectMap( | ||
containers: DroppableContainers | null | ||
): LayoutRectMap { | ||
const layoutRectMap: LayoutRectMap = new Map(); | ||
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if (containers) { | ||
for (const container of Object.values(containers)) { | ||
if (!container) { | ||
continue; | ||
} | ||
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const {id, rect, disabled} = container; | ||
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if (disabled || rect.current == null) { | ||
continue; | ||
} | ||
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layoutRectMap.set(id, rect.current); | ||
} | ||
} | ||
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return layoutRectMap; | ||
} | ||
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const defaultLayoutMeasuring: LayoutMeasuring = { | ||
strategy: LayoutMeasuringStrategy.WhileDragging, | ||
frequency: LayoutMeasuringFrequency.Optimized, | ||
}; | ||
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function getLayoutMeasuring( | ||
layoutMeasuring: Arguments['config'] | ||
): LayoutMeasuring { | ||
return layoutMeasuring | ||
? { | ||
...defaultLayoutMeasuring, | ||
...layoutMeasuring, | ||
} | ||
: defaultLayoutMeasuring; | ||
} |
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