71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
// composables/useColumnCount.js
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import {
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ref,
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onMounted,
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onUnmounted,
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watch
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} from 'vue'
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export function useColumnCount(onChange = () => {}) {
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const columnCount = ref(0)
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const columnSpace = ref(2)
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// const calcColumn = () => {
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// const width = uni.getSystemInfoSync().windowWidth
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// console.log(width)
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// const count = Math.min(5, Math.floor(width / 375) + 1)
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// if (count !== columnCount.value) {
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// columnCount.value = count < 2 ? 2 : count
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// }
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// }
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const calcColumn = () => {
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const width = uni.getSystemInfoSync().windowWidth
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let count = 2
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if (width >= 1000) {
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count = 5
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} else if (width >= 750) {
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count = 4
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} else if (width >= 500) {
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count = 3
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} else {
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count = 2
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}
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if (count !== columnCount.value) {
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columnCount.value = count
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}
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// 计算间距：count=2 => 1，count=5 => 2，中间线性插值
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const spacing = 2 - (count - 2) * (1 / 3)
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// console.log('列数:', count, '间距:', spacing.toFixed(2))
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columnSpace.value = spacing
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}
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onMounted(() => {
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columnCount.value = 2
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calcColumn()
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// if (process.client) {
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window.addEventListener('resize', calcColumn)
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// }
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})
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onUnmounted(() => {
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// if (process.client) {
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window.removeEventListener('resize', calcColumn)
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// }
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})
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// 列数变化时执行回调
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watch(columnCount, (newVal, oldVal) => {
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if (newVal !== oldVal) {
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onChange(newVal)
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}
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})
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return {
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columnCount,
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columnSpace
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}
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} |