49 lines
1.1 KiB
TypeScript
49 lines
1.1 KiB
TypeScript
type MutableCurrent<T> = {
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current: T;
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};
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type AttachDocumentMouseDrag = (
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documentTarget: Document,
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onMove: (event: MouseEvent) => void,
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onUp: (event: MouseEvent) => void,
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) => () => void;
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type BeginAllocationDragSessionParams<TState> = {
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state: TState;
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cleanupRef: MutableCurrent<(() => void) | null>;
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stateRef: MutableCurrent<TState>;
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setState: (state: TState) => void;
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documentTarget: Document;
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attachDrag: AttachDocumentMouseDrag;
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updatePosition: (clientX: number) => void;
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finalize: (clientX: number) => Promise<void> | void;
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};
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export function beginAllocationDragSession<TState>({
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state,
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cleanupRef,
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stateRef,
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setState,
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documentTarget,
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attachDrag,
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updatePosition,
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finalize,
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}: BeginAllocationDragSessionParams<TState>) {
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stateRef.current = state;
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setState(state);
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cleanupRef.current?.();
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function handleMove(event: MouseEvent) {
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updatePosition(event.clientX);
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}
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function handleUp(event: MouseEvent) {
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cleanupRef.current?.();
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cleanupRef.current = null;
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void finalize(event.clientX);
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event.preventDefault();
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}
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cleanupRef.current = attachDrag(documentTarget, handleMove, handleUp);
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}
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