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uview-plus/components/u-scroll-list/nvue.js

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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
+const BindingX = uni.requireNativePlugin('bindingx')
+import { os } from '../../libs/function/index';
+export default {
+    methods: {
+        // 此处不写注释，请自行体会
+        nvueScrollHandler(e) {
+            const anchor = this.$refs['u-scroll-list__scroll-view'].ref
+            let element = {}
+            if (this.$refs['u-scroll-list__indicator__line__bar']) {
+                element = this.$refs['u-scroll-list__indicator__line__bar'].ref
+            }
+            const scrollLeft = e.contentOffset.x
+            const contentSize = e.contentSize.width
+            const { scrollWidth } = this
+            const barAllMoveWidth = this.indicatorWidth - this.indicatorBarWidth
+            // 在安卓和iOS上，需要除的倍数不一样，iOS需要除以2
+            const actionNum = os() === 'ios' ? 2 : 1
+            const expression = `(x / ${actionNum}) / ${contentSize - scrollWidth} * ${barAllMoveWidth}`
+            BindingX.bind({
+                anchor,
+                eventType: 'scroll',
+                props: [{
+                    element,
+                    property: 'transform.translateX',
+                    expression
+                }]
+            })
+        }
+    }
+}

uview-plus/components/u-scroll-list/props.js

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+import { defineMixin } from '../../libs/vue'
+import defProps from '../../libs/config/props.js'
+export const props = defineMixin({
+    props: {
+        // 指示器的整体宽度
+        indicatorWidth: {
+            type: [String, Number],
+            default: () => defProps.scrollList.indicatorWidth
+        },
+        // 滑块的宽度
+        indicatorBarWidth: {
+            type: [String, Number],
+            default: () => defProps.scrollList.indicatorBarWidth
+        },
+        // 是否显示面板指示器
+        indicator: {
+            type: Boolean,
+            default: () => defProps.scrollList.indicator
+        },
+        // 指示器非激活颜色
+        indicatorColor: {
+            type: String,
+            default: () => defProps.scrollList.indicatorColor
+        },
+        // 指示器的激活颜色
+        indicatorActiveColor: {
+            type: String,
+            default: () => defProps.scrollList.indicatorActiveColor
+        },
+        // 指示器样式，可通过bottom，left，right进行定位
+        indicatorStyle: {
+            type: [String, Object],
+            default: () => defProps.scrollList.indicatorStyle
+        }
+    }
+})

uview-plus/components/u-scroll-list/scrollList.js

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+/*
+ * @Author       : LQ
+ * @Description  :
+ * @version      : 1.0
+ * @Date         : 2021-08-20 16:44:21
+ * @LastAuthor   : LQ
+ * @lastTime     : 2021-08-20 17:19:28
+ * @FilePath     : /u-view2.0/uview-ui/libs/config/props/scrollList.js
+ */
+export default {
+    // scrollList
+    scrollList: {
+        indicatorWidth: 50,
+        indicatorBarWidth: 20,
+        indicator: true,
+        indicatorColor: '#f2f2f2',
+        indicatorActiveColor: '#3c9cff',
+        indicatorStyle: ''
+    }
+}

uview-plus/components/u-scroll-list/scrollWxs.wxs

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+function scroll(event, ownerInstance) {
+	// 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
+	var detail = event.detail
+	var scrollWidth = detail.scrollWidth
+	var scrollLeft = detail.scrollLeft
+	// 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
+	var dataset = event.currentTarget.dataset
+	// 此为scroll-view外部包裹元素的宽度
+	// 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
+	var scrollComponentWidth = dataset.scrollWidth || dataset.scrollwidth || 0
+	// 指示器和滑块的宽度
+	var indicatorWidth = dataset.indicatorWidth || dataset.indicatorwidth || 0
+	var barWidth = dataset.barWidth || dataset.barwidth || 0
+	// 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
+	// 滑动距离(指示器的总宽度减去滑块宽度)的比值
+	var x = scrollLeft / (scrollWidth - scrollComponentWidth) * (indicatorWidth - barWidth)
+	setBarStyle(ownerInstance, x)
+}
+
+// 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
+// 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
+// 所以这里需要对临界值做监听并处理
+function scrolltolower(event, ownerInstance) {
+	ownerInstance.callMethod('scrollEvent', 'right')
+	// 获取当前组件的dataset
+	var dataset = event.currentTarget.dataset
+	// 指示器和滑块的宽度
+	var indicatorWidth = dataset.indicatorWidth || dataset.indicatorwidth || 0
+	var barWidth = dataset.barWidth || dataset.barwidth || 0
+	// 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
+	setBarStyle(ownerInstance, indicatorWidth - barWidth)
+}
+
+function scrolltoupper(event, ownerInstance) {
+	ownerInstance.callMethod('scrollEvent', 'left')
+	// 滚动到左边时，将滑块设置为0的偏移距离，回到起点
+	setBarStyle(ownerInstance, 0)
+}
+
+function setBarStyle(ownerInstance, x) {
+	ownerInstance.selectComponent('.u-scroll-list__indicator__line__bar') && ownerInstance.selectComponent('.u-scroll-list__indicator__line__bar').setStyle({
+		transform: 'translateX(' + x + 'px)'
+	})
+}
+
+module.exports = {
+	scroll: scroll,
+	scrolltolower: scrolltolower,
+	scrolltoupper: scrolltoupper
+}