19 lines
836 B
TypeScript
19 lines
836 B
TypeScript
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export const calculateItemPosition = (positionBefore: number | null, positionAfter: number | null): number => {
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if (positionBefore === null && positionAfter === null) {
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return 0
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}
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// If there is no task before, our task is the first task in which case we let it have half of the position of the task after it
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if (positionBefore === null && positionAfter !== null) {
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return positionAfter / 2
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}
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// If there is no task after it, we just add 2^16 to the last position to have enough room in the future
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if (positionBefore !== null && positionAfter === null) {
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return positionBefore + Math.pow(2, 16)
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}
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// If we have both a task before and after it, we acually calculate the position
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// @ts-ignore - can never be null but TS does not seem to understand that
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return positionBefore + (positionAfter - positionBefore) / 2
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}
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