153 lines
4.1 KiB
JavaScript
153 lines
4.1 KiB
JavaScript
Component({
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data: {
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tabTop: 0,
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wrapScrollTop: 0
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},
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props: {
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activeTab: 0,
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className: '',
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tabs: [],
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animated: false,
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swipeable: true,
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tabBarActiveTextColor: '#108ee9',
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tabBarInactiveTextColor: '#333333',
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tabBarActiveBgColor: '#ffffff',
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tabBarInactiveBgColor: '#f8f8f8',
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tabBarlineColor: '#108ee9',
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onTabClick: function onTabClick() {},
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onScrollBar: function onScrollBar() {}
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},
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didMount: function didMount() {
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this.isScrolling = false;
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this.timerId = null;
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this.calcHeight();
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},
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didUpdate: function didUpdate(prevProps) {
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if (this.props.tabs.length !== prevProps.tabs.length) {
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this.calcHeight();
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}
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},
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didUnmount: function didUnmount() {
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if (this.timerId) {
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clearTimeout(this.timerId);
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this.timerId = null;
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}
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},
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methods: {
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calcHeight: function calcHeight() {
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var _this = this;
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var _props = this.props,
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tabs = _props.tabs,
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activeTab = _props.activeTab;
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this.anchorMap = {};
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this.indexMap = {};
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this.wrapHeight = 0;
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this.scrollWrapHeight = 0;
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my.createSelectorQuery().select('.am-vtabs-slides').boundingClientRect().exec(function (ret) {
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_this.wrapHeight = ret[0].height;
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});
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var cacheHeight = 0;
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var _loop = function _loop(i) {
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var anchor = tabs[i].anchor;
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/* eslint-disable no-loop-func */
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my.createSelectorQuery().select('#am-vtab-slide-' + anchor).boundingClientRect().exec(function (ret) {
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_this.anchorMap[anchor] = cacheHeight;
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_this.indexMap[i] = cacheHeight;
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if (activeTab === i) {
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_this.setData({
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wrapScrollTop: _this.indexMap[i]
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});
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}
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cacheHeight += ret[0].height;
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_this.scrollWrapHeight = cacheHeight;
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});
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};
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for (var i = 0; i < tabs.length; i++) {
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_loop(i);
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}
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},
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handleTabClick: function handleTabClick(e) {
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var _e$target$dataset = e.target.dataset,
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anchor = _e$target$dataset.anchor,
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index = _e$target$dataset.index;
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if (!this.isScrolling || !this.props.swipeable) {
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if (this.props.activeTab !== index) {
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this.props.onTabClick(index);
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}
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this.setData({
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wrapScrollTop: this.anchorMap[anchor]
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});
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this.moveScrollBar(index);
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}
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},
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moveScrollBar: function moveScrollBar(current) {
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var tabTop = void 0;
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if (current < 6) {
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tabTop = 0;
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} else {
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tabTop = (current - 5) * 55;
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}
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if (this.props.activeTab !== current) {
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if (this.props.onChange) {
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this.props.onChange(current);
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} else {
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this.props.onScrollBar(current);
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}
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}
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this.setData({
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tabTop: tabTop,
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current: current
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});
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},
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onScroll: function onScroll(e) {
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var _this2 = this;
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var scrollTop = e.detail.scrollTop;
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var keys = Object.keys(this.anchorMap);
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if (this.timerId) {
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clearTimeout(this.timerId);
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this.timerId = null;
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}
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this.timerId = setTimeout(function () {
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_this2.isScrolling = false;
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}, 300);
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var anchorLength = keys.length;
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for (var i = 0; i < anchorLength; i++) {
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if (i === anchorLength - 1) {
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// 如果是最后一个只需满足scrollTop高于当前vtab-content的高度
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if (scrollTop >= this.anchorMap[keys[i]]) {
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this.moveScrollBar(i);
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break;
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}
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}
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if (scrollTop >= Math.floor(this.anchorMap[keys[i]]) && scrollTop < Math.floor(this.anchorMap[keys[i + 1]])) {
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// 如果没个vtab-content高度小于scroll-view高度，到达底部后就不需要根据scrollTop再去判断左侧的选择项
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if (scrollTop + this.wrapHeight < this.scrollWrapHeight) {
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this.moveScrollBar(i);
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}
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break;
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}
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}
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},
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onWrapTouchMove: function onWrapTouchMove() {
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if (this.props.swipeable) {
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this.isScrolling = true;
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}
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}
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}
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}); |