22 lines
526 B
Dart
22 lines
526 B
Dart
import 'dart:math';
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double calculateItemPosition({double? positionBefore, double? positionAfter}) {
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// only
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if (positionBefore == null && positionAfter == null) {
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return 0;
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}
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// first
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if (positionBefore == null && positionAfter != null) {
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return positionAfter / 2;
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}
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// last
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if (positionBefore != null && positionAfter == null) {
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return positionBefore + pow(2.0, 16.0);
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}
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// in the middle (positionBefore != null && positionAfter != null)
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return (positionBefore! + positionAfter!) / 2;
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}
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