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zhz-front-app/hook/useColumnCount.js

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2025-10-24 09:34:42 +08:00
// composables/useColumnCount.js
import {
ref,
onMounted,
onUnmounted,
watch
} from 'vue'
export function useColumnCount(onChange = () => {}) {
const columnCount = ref(0)
const columnSpace = ref(2)
// const calcColumn = () => {
// const width = uni.getSystemInfoSync().windowWidth
// console.log(width)
// const count = Math.min(5, Math.floor(width / 375) + 1)
// if (count !== columnCount.value) {
// columnCount.value = count < 2 ? 2 : count
// }
// }
const calcColumn = () => {
const width = uni.getSystemInfoSync().windowWidth
let count = 2
if (width >= 1000) {
count = 5
} else if (width >= 750) {
count = 4
} else if (width >= 500) {
count = 3
} else {
count = 2
}
if (count !== columnCount.value) {
columnCount.value = count
}
// 计算间距count=2 => 1count=5 => 2中间线性插值
const spacing = 2 - (count - 2) * (1 / 3)
// console.log('列数:', count, '间距:', spacing.toFixed(2))
columnSpace.value = spacing
}
onMounted(() => {
columnCount.value = 2
calcColumn()
// if (process.client) {
window.addEventListener('resize', calcColumn)
// }
})
onUnmounted(() => {
// if (process.client) {
window.removeEventListener('resize', calcColumn)
// }
})
// 列数变化时执行回调
watch(columnCount, (newVal, oldVal) => {
if (newVal !== oldVal) {
onChange(newVal)
}
})
return {
columnCount,
columnSpace
}
}