<template>
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<!-- #ifdef MP-WEIXIN -->
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<view
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class="tn-c-swiper-item"
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:style="[swiperStyle]"
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:itemData="itemData"
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:currentIndex="currentIndex"
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:containerData="containerData"
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:change:itemData="wxs.itemDataObserver"
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:change:currentIndex="wxs.currentIndexObserver"
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:change:containerData="wxs.containerDataObserver"
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@touchstart="wxs.touchStart"
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:catch:touchmove="touching?wxs.touchMove:''"
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:catch:touchend="touching?wxs.touchEnd:''"
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>
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<view class="item__container tn-c-swiper-item__container" :style="[containerStyle]">
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<slot></slot>
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</view>
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</view>
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<!-- #endif -->
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<!-- #ifndef MP-WEIXIN -->
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<view
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class="tn-c-swiper-item"
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:style="[swiperStyle]"
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:itemData="itemData"
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:currentIndex="currentIndex"
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:containerData="containerData"
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:change:itemData="wxs.itemDataObserver"
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:change:currentIndex="wxs.currentIndexObserver"
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:change:containerData="wxs.containerDataObserver"
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@touchstart="wxs.touchStart"
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@touchmove="wxs.touchMove"
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@touchend="wxs.touchEnd"
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>
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<view class="item__container tn-c-swiper-item__container" :style="[containerStyle]">
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<slot></slot>
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</view>
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</view>
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<!-- #endif -->
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</template>
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<script src="./index.wxs" lang="wxs" module="wxs"></script>
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<script>
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export default {
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name: 'tn-custom-swiper-item',
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props: {
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},
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computed: {
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// swiperItem公共数据
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itemData() {
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return {
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index: this.index,
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itemWidth: this.itemWidth,
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itemHeight: this.itemHeight,
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itemTop: this.itemTop,
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itemLeft: this.itemLeft
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}
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},
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currentIndex() {
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return this.parentData.currentIndex
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},
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containerData() {
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return {
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duration: this.parentData.duration,
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animationFinish: this.parentData.swiperContainerAnimationFinish,
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circular: this.parentData.circular,
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swiperItemLength: this.swiperItemLength,
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vertical: this.parentData.vertical
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}
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},
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swiperStyle() {
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let style = {}
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style.transform = `translate3d(${this.translateX}%, ${this.translateY}%, 0px)`
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return style
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},
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containerStyle() {
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let style = {}
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if (this.parentData.customSwiperStyle && Object.keys(this.parentData.customSwiperStyle).length > 0) {
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style = this.parentData.customSwiperStyle
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}
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if ((this.currentIndex === 0 && this.index === this.swiperItemLength - 1) || (this.index === this.currentIndex - 1) &&
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(this.parentData.prevSwiperStyle && Object.keys(this.parentData.prevSwiperStyle).length > 0)
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) {
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// 前一个swiperItem
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const copyStyle = JSON.parse(JSON.stringify(style))
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style = Object.assign(copyStyle, this.parentData.prevSwiperStyle)
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}
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if ((this.currentIndex === this.swiperItemLength - 1 && this.index === 0) || (this.index === this.currentIndex + 1) &&
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(this.parentData.nextSwiperStyle && Object.keys(this.parentData.nextSwiperStyle).length > 0)
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) {
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// 后一个swiperItem
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const copyStyle = JSON.parse(JSON.stringify(style))
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style = Object.assign(copyStyle, this.parentData.nextSwiperStyle)
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}
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return style
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}
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},
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data() {
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return {
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// 父组件参数
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parentData: {
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duration: 500,
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currentIndex: 0,
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swiperContainerAnimationFinish: false,
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circular: false,
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vertical: false,
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prevSwiperStyle: {},
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customSwiperStyle: {},
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nextSwiperStyle: {}
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},
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// 标记当前是否正在触摸
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touching: true,
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// 当前swiperItem的偏移位置
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translateX: 0,
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translateY: 0,
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// 当前swiperItem的宽高
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itemWidth: 0,
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itemHeight: 0,
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// 当前swiperItem的位置信息
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itemTop: 0,
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itemLeft: 0,
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// 当前swiperItem的状态 prev current next
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status: 'current',
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// 当前swiperItem的index序号
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index: 0,
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// swiperItem的的数量
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swiperItemLength: 0
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}
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},
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created() {
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this.parent = false
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this.updateParentData()
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// 获取当前父组件children的数量作为当前swiperItem的序号
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this.index = this.parent.children.length
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this.parent && this.parent.children.push(this)
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},
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mounted() {
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this.$nextTick(() => {
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this.initSwiperItem()
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})
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},
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methods: {
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// 初始化swiperItem
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initSwiperItem() {
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this.getSwiperItemRect(() => {
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this.parent.updateAllSwiperItemStyle()
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this.parentData.swiperContainerAnimationFinish = true
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})
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},
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// 获取swiperItem的信息
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async getSwiperItemRect(callback) {
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const swiperItemRes = await this._tGetRect('.tn-c-swiper-item')
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if (!swiperItemRes.height || !swiperItemRes.width) {
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setTimeout(() => {
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this.getSwiperItemRect()
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}, 30)
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return
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}
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this.itemWidth = swiperItemRes.width
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this.itemHeight = swiperItemRes.height
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this.itemTop = swiperItemRes.top
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this.itemLeft = swiperItemRes.left
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callback && callback()
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},
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// 更新swiperItem样式
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updateSwiperItemStyle(swiperItemLength, currentIndex = undefined) {
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currentIndex = currentIndex != undefined ? currentIndex : this.parentData.currentIndex
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this.swiperItemLength = swiperItemLength
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// 根据当前swiperItem的序号设置偏移位置
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// 判断当前swiperItem是否为第一个，如果是则将最后的swiperItem移动到当前的前一个位置（即最前面）
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if (currentIndex === 0 && this.index === swiperItemLength - 1) {
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if (this.parentData.vertical) {
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this.translateX = 0
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this.translateY = -100
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} else {
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this.translateX = -100
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this.translateY = 0
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}
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}
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// 判断当前swiperItem是否为最后一个，如果是则将最前的swiperItem移动到当前的后一个位置（即最后面）
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else if (currentIndex === swiperItemLength - 1 && this.index === 0) {
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if (this.parentData.vertical) {
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this.translateX = 0
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this.translateY = swiperItemLength * 100
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} else {
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this.translateX = swiperItemLength * 100
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this.translateY = 0
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}
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}
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// 正常情况
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else {
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if (this.parentData.vertical) {
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this.translateX = 0
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this.translateY = this.index * 100
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} else {
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this.translateX = this.index * 100
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this.translateY = 0
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}
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}
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},
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// 更新父组件的偏移位置信息
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updateParentSwiperContainerStyle(e) {
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this.parent.updateSwiperContainerStyleWithValue(e.value)
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},
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// 根据方向更新父组件的偏移位置信息
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updateParentSwiperContainerStyleWithDirection(e) {
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this.parent.updateSwiperContainerStyleWithDirection(e.direction)
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},
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// 修改父组件的偏移位置的状态
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changeParentSwiperContainerStyleStatus(e) {
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// reset -> 重置 reload -> 重载
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this.parent.updateSwiperContainerStyleWithDirection(e.status)
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},
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// 更新父组件信息
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updateParentData() {
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this.getParentData('tn-custom-swiper')
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},
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// 更新触摸状态
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updateTouchingStatus(e) {
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this.touching = e.status
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if (e.status) {
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this.parent.stopAutoPlay()
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} else {
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this.parent.startAutoPlay()
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}
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},
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// 提取对应用户自定义样式
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extractCustomStyle(customStyle) {
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let data = {
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transform: {},
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style: {}
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}
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if (!customStyle) return data
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// 允许设置的transform参数
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const allowTransformProps = ['scale','scaleX','scaleY','scaleZ','rotate','rotateX','rotateY','rotateZ']
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for (let prop in customStyle) {
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if (prop.startsWith('transformProp')) {
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// transform里面的样式
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let transformProp = prop.substring('transformProp'.length)
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const index = allowTransformProps.findIndex((item) => {
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return item.toLowerCase() === transformProp.toLowerCase()
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})
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if (index !== -1) {
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transformProp = allowTransformProps[index]
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data.transform[transformProp] = customStyle[prop]
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}
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} else {
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// 普通样式
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data.style[prop] = customStyle[prop]
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}
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}
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return data
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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.tn-c-swiper-item {
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width: 100%;
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height: 100%;
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position: absolute;
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display: block;
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will-change: transform;
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cursor: none;
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transform: translate3d(0px, 0px, 0px);
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.item__container {
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width: 100%;
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height: 100%;
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display: block;
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position: absolute;
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}
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}
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</style>
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