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83 lines
2.1 KiB
83 lines
2.1 KiB
import baseComponent from '../helpers/baseComponent'
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import classNames from '../helpers/classNames'
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baseComponent({
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relations: {
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'../sticky/index': {
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type: 'parent',
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},
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},
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properties: {
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prefixCls: {
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type: String,
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value: 'wux-sticky-item',
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},
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title: {
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type: String,
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value: '',
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},
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content: {
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type: String,
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value: '',
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},
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},
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data: {
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isFixed: false,
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index: 0,
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top: 0,
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height: 0,
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},
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computed: {
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classes: ['prefixCls, isFixed', function(prefixCls, isFixed) {
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const wrap = classNames(prefixCls, {
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[`${prefixCls}--fixed`]: isFixed,
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})
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const hd = `${prefixCls}__hd`
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const title = `${prefixCls}__title`
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const bd = `${prefixCls}__bd`
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const content = `${prefixCls}__content`
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return {
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wrap,
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hd,
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title,
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bd,
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content,
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}
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}],
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},
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methods: {
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onScroll(scrollTop) {
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const parent = this.getRelationNodes('../sticky/index')[0]
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const { top, height, index } = this.data
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const isFixed = scrollTop >= top && scrollTop < top + height
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if (this.data.isFixed !== isFixed) {
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this.setData({
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isFixed,
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})
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if (parent) {
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parent.triggerEvent(isFixed ? 'stick' : 'unstick', { index })
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}
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}
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},
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updated(index) {
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const className = `.${this.data.prefixCls}`
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wx
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.createSelectorQuery()
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.in(this)
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.select(className)
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.boundingClientRect((rect) => {
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if (!rect) return
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this.setData({
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top: rect.top,
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height: rect.height,
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index,
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})
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})
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.exec()
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},
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},
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})
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