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uni-app引入使用uView
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// 引入bindingx,此库类似于微信小程序wxs,目的是让js运行在视图层,减少视图层和逻辑层的通信折损
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const BindingX = uni.requireNativePlugin('bindingx')
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export default {
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methods: {
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// 此处不写注释,请自行体会
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nvueScrollHandler(e) {
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const anchor = this.$refs['u-scroll-list__scroll-view'].ref
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const element = this.$refs['u-scroll-list__indicator__line__bar'].ref
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const scrollLeft = e.contentOffset.x
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const contentSize = e.contentSize.width
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const { scrollWidth } = this
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const barAllMoveWidth = this.indicatorWidth - this.indicatorBarWidth
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// 在安卓和iOS上,需要除的倍数不一样,iOS需要除以2
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const actionNum = uni.$u.os() === 'ios' ? 2 : 1
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const expression = `(x / ${actionNum}) / ${contentSize - scrollWidth} * ${barAllMoveWidth}`
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BindingX.bind({
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anchor,
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eventType: 'scroll',
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props: [{
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element,
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property: 'transform.translateX',
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expression
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}]
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})
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}
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}
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}
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export default {
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props: {
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// 指示器的整体宽度
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indicatorWidth: {
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type: [String, Number],
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default: uni.$u.props.scrollList.indicatorWidth
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},
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// 滑块的宽度
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indicatorBarWidth: {
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type: [String, Number],
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default: uni.$u.props.scrollList.indicatorBarWidth
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},
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// 是否显示面板指示器
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indicator: {
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type: Boolean,
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default: uni.$u.props.scrollList.indicator
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},
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// 指示器非激活颜色
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indicatorColor: {
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type: String,
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default: uni.$u.props.scrollList.indicatorColor
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},
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// 指示器的激活颜色
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indicatorActiveColor: {
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type: String,
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default: uni.$u.props.scrollList.indicatorActiveColor
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},
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// 指示器样式,可通过bottom,left,right进行定位
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indicatorStyle: {
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type: [String, Object],
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default: uni.$u.props.scrollList.indicatorStyle
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}
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}
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}
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@ -0,0 +1,50 @@
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function scroll(event, ownerInstance) {
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// detail中含有scroll-view的信息,比如scroll-view的实际宽度,当前时间点scroll-view的移动距离等
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var detail = event.detail
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var scrollWidth = detail.scrollWidth
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var scrollLeft = detail.scrollLeft
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// 获取当前组件的dataset,说白了就是祸国殃民的腾xun搞出来的垃ji
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var dataset = event.currentTarget.dataset
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// 此为scroll-view外部包裹元素的宽度
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// 某些HX版本(3.1.18),发现view元素中大写的data-scrollWidth,在wxs中,变成了全部小写,所以这里需要特别处理
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var scrollComponentWidth = dataset.scrollWidth || dataset.scrollwidth || 0
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// 指示器和滑块的宽度
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var indicatorWidth = dataset.indicatorWidth || dataset.indicatorwidth || 0
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var barWidth = dataset.barWidth || dataset.barwidth || 0
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// 此处的计算理由为:scroll-view的滚动距离与目标滚动距离(scroll-view的实际宽度减去包裹元素的宽度)之比,等于滑块当前移动距离与总需
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// 滑动距离(指示器的总宽度减去滑块宽度)的比值
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var x = scrollLeft / (scrollWidth - scrollComponentWidth) * (indicatorWidth - barWidth)
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setBarStyle(ownerInstance, x)
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}
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// 由于webview的无能,无法保证scroll-view在滑动过程中,一直触发scroll事件,会导致
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// 无法监听到某些滚动值,当在首尾临界值无法监听到时,这是致命的,因为错失这些值会导致滑块无法回到起点和终点
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// 所以这里需要对临界值做监听并处理
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function scrolltolower(event, ownerInstance) {
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ownerInstance.callMethod('scrollEvent', 'right')
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// 获取当前组件的dataset
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var dataset = event.currentTarget.dataset
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// 指示器和滑块的宽度
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var indicatorWidth = dataset.indicatorWidth || dataset.indicatorwidth || 0
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var barWidth = dataset.barWidth || dataset.barwidth || 0
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// scroll-view滚动到右边终点时,将滑块也设置为到右边的终点,它所需移动的距离为:指示器宽度 - 滑块宽度
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setBarStyle(ownerInstance, indicatorWidth - barWidth)
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}
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function scrolltoupper(event, ownerInstance) {
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ownerInstance.callMethod('scrollEvent', 'left')
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// 滚动到左边时,将滑块设置为0的偏移距离,回到起点
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setBarStyle(ownerInstance, 0)
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}
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function setBarStyle(ownerInstance, x) {
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ownerInstance.selectComponent('.u-scroll-list__indicator__line__bar') && ownerInstance.selectComponent('.u-scroll-list__indicator__line__bar').setStyle({
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transform: 'translateX(' + x + 'px)'
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})
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}
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module.exports = {
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scroll: scroll,
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scrolltolower: scrolltolower,
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scrolltoupper: scrolltoupper
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}
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<template>
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<view
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class="u-scroll-list"
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ref="u-scroll-list"
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>
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<!-- #ifdef APP-NVUE -->
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<!-- nvue使用bindingX实现,以得到更好的性能 -->
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<scroller
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class="u-scroll-list__scroll-view"
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ref="u-scroll-list__scroll-view"
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scroll-direction="horizontal"
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:show-scrollbar="false"
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:offset-accuracy="1"
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@scroll="nvueScrollHandler"
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>
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<view class="u-scroll-list__scroll-view__content">
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<slot />
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</view>
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</scroller>
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<!-- #endif -->
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<!-- #ifndef APP-NVUE -->
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<!-- #ifdef MP-WEIXIN || APP-VUE || H5 || MP-QQ -->
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<!-- 以上平台,支持wxs -->
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<scroll-view
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class="u-scroll-list__scroll-view"
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scroll-x
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@scroll="wxs.scroll"
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@scrolltoupper="wxs.scrolltoupper"
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@scrolltolower="wxs.scrolltolower"
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:data-scrollWidth="scrollWidth"
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:data-barWidth="$u.getPx(indicatorBarWidth)"
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:data-indicatorWidth="$u.getPx(indicatorWidth)"
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:show-scrollbar="false"
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:upper-threshold="0"
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:lower-threshold="0"
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>
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<!-- #endif -->
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<!-- #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ -->
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<!-- 非以上平台,只能使用普通js实现 -->
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<scroll-view
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class="u-scroll-list__scroll-view"
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scroll-x
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@scroll="scrollHandler"
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@scrolltoupper="scrolltoupperHandler"
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@scrolltolower="scrolltolowerHandler"
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:show-scrollbar="false"
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:upper-threshold="0"
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:lower-threshold="0"
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>
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<!-- #endif -->
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<view class="u-scroll-list__scroll-view__content">
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<slot />
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</view>
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</scroll-view>
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<!-- #endif -->
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<view
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class="u-scroll-list__indicator"
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v-if="indicator"
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:style="[$u.addStyle(indicatorStyle)]"
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>
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<view
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class="u-scroll-list__indicator__line"
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:style="[lineStyle]"
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>
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<view
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class="u-scroll-list__indicator__line__bar"
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:style="[barStyle]"
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ref="u-scroll-list__indicator__line__bar"
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></view>
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</view>
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</view>
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</view>
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</template>
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<!-- #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ -->
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<script
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src="./scrollWxs.wxs"
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module="wxs"
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lang="wxs"
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></script>
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<!-- #endif -->
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<script>
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/**
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* scrollList 横向滚动列表
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* @description 该组件一般用于同时展示多个商品、分类的场景,也可以完成左右滑动的列表。
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* @tutorial https://www.uviewui.com/components/scrollList.html
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* @property {String | Number} indicatorWidth 指示器的整体宽度 (默认 50 )
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* @property {String | Number} indicatorBarWidth 滑块的宽度 (默认 20 )
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* @property {Boolean} indicator 是否显示面板指示器 (默认 true )
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* @property {String} indicatorColor 指示器非激活颜色 (默认 '#f2f2f2' )
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* @property {String} indicatorActiveColor 指示器的激活颜色 (默认 '#3c9cff' )
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* @property {String | Object} indicatorStyle 指示器样式,可通过bottom,left,right进行定位
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* @event {Function} left 滑动到左边时触发
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* @event {Function} right 滑动到右边时触发
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* @example
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*/
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// #ifdef APP-NVUE
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const dom = uni.requireNativePlugin('dom')
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import nvueMixin from "./nvue.js"
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// #endif
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import props from './props.js';
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export default {
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name: 'u-scroll-list',
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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// #ifdef APP-NVUE
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mixins: [uni.$u.mpMixin, uni.$u.mixin, nvueMixin, props],
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// #endif
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data() {
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return {
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scrollInfo: {
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scrollLeft: 0,
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scrollWidth: 0
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},
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scrollWidth: 0
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}
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},
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computed: {
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// 指示器为线型的样式
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barStyle() {
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const style = {}
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// #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ
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// 此为普通js方案,只有在非nvue和不支持wxs方案的端才使用、
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// 此处的计算理由为:scroll-view的滚动距离与目标滚动距离(scroll-view的实际宽度减去包裹元素的宽度)之比,等于滑块当前移动距离与总需
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// 滑动距离(指示器的总宽度减去滑块宽度)的比值
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const scrollLeft = this.scrollInfo.scrollLeft,
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scrollWidth = this.scrollInfo.scrollWidth,
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barAllMoveWidth = this.indicatorWidth - this.indicatorBarWidth
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const x = scrollLeft / (scrollWidth - this.scrollWidth) * barAllMoveWidth
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style.transform = `translateX(${ x }px)`
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// #endif
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// 设置滑块的宽度和背景色,是每个平台都需要的
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style.width = uni.$u.addUnit(this.indicatorBarWidth)
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style.backgroundColor = this.indicatorActiveColor
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return style
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},
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lineStyle() {
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const style = {}
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// 指示器整体的样式,需要设置其宽度和背景色
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style.width = uni.$u.addUnit(this.indicatorWidth)
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style.backgroundColor = this.indicatorColor
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return style
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}
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},
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mounted() {
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this.init()
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},
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methods: {
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init() {
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this.getComponentWidth()
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},
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// #ifndef APP-NVUE || MP-WEIXIN || H5 || APP-VUE || MP-QQ
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// scroll-view触发滚动事件
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scrollHandler(e) {
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this.scrollInfo = e.detail
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},
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scrolltoupperHandler() {
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this.scrollEvent('left')
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this.scrollInfo.scrollLeft = 0
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},
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scrolltolowerHandler() {
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this.scrollEvent('right')
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// 在普通js方案中,滚动到右边时,通过设置this.scrollInfo,模拟出滚动到右边的情况
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// 因为上方是用过computed计算的,设置后,会自动调整滑块的位置
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this.scrollInfo.scrollLeft = uni.$u.getPx(this.indicatorWidth) - uni.$u.getPx(this.indicatorBarWidth)
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},
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// #endif
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//
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scrollEvent(status) {
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this.$emit(status)
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},
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// 获取组件的宽度
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async getComponentWidth() {
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// 延时一定时间,以获取dom尺寸
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await uni.$u.sleep(30)
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// #ifndef APP-NVUE
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this.$uGetRect('.u-scroll-list').then(size => {
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this.scrollWidth = size.width
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})
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// #endif
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// #ifdef APP-NVUE
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const ref = this.$refs['u-scroll-list']
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ref && dom.getComponentRect(ref, (res) => {
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this.scrollWidth = res.size.width
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})
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// #endif
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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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@import "../../libs/css/components.scss";
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.u-scroll-list {
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padding-bottom: 10px;
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&__scroll-view {
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@include flex;
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&__content {
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@include flex;
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}
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}
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&__indicator {
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@include flex;
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justify-content: center;
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margin-top: 15px;
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&__line {
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width: 60px;
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height: 4px;
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border-radius: 100px;
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overflow: hidden;
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&__bar {
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width: 20px;
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height: 4px;
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border-radius: 100px;
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}
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}
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}
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}
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</style>
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