56 lines
1.3 KiB
TypeScript
56 lines
1.3 KiB
TypeScript
import type { ComputedRef, Ref } from 'vue';
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import { computed } from 'vue';
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import type { StickyOffsets } from '../interface';
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/**
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* Get sticky column offset width
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*/
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function useStickyOffsets(
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colWidthsRef: Ref<number[]>,
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columnCountRef: Ref<number>,
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directionRef: Ref<'ltr' | 'rtl'>,
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) {
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const stickyOffsets: ComputedRef<StickyOffsets> = computed(() => {
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const leftOffsets: number[] = [];
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const rightOffsets: number[] = [];
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let left = 0;
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let right = 0;
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const colWidths = colWidthsRef.value;
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const columnCount = columnCountRef.value;
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const direction = directionRef.value;
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for (let start = 0; start < columnCount; start += 1) {
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if (direction === 'rtl') {
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// Left offset
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rightOffsets[start] = right;
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right += colWidths[start] || 0;
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// Right offset
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const end = columnCount - start - 1;
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leftOffsets[end] = left;
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left += colWidths[end] || 0;
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} else {
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// Left offset
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leftOffsets[start] = left;
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left += colWidths[start] || 0;
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// Right offset
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const end = columnCount - start - 1;
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rightOffsets[end] = right;
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right += colWidths[end] || 0;
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}
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}
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return {
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left: leftOffsets,
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right: rightOffsets,
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};
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});
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return stickyOffsets;
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}
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export default useStickyOffsets;
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