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51 lines
2.5 KiB
51 lines
2.5 KiB
3 years ago
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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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