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265 lines
9.0 KiB
265 lines
9.0 KiB
8 months ago
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<template>
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<view class="u-sticky" :id="elId" :style="[style]">
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<view :style="[stickyContent]" class="u-sticky__content"><slot /></view>
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</view>
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</template>
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<script>
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import { deepMerge, addStyle, addUnit, sleep, guid, getPx, os, sys } from '@/sheep/helper';
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import sheep from '@/sheep';
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/**
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* sticky 吸顶
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* @description 该组件与CSS中position: sticky属性实现的效果一致，当组件达到预设的到顶部距离时， 就会固定在指定位置，组件位置大于预设的顶部距离时，会重新按照正常的布局排列。
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* @property {String ｜ Number} offsetTop 吸顶时与顶部的距离，单位px（默认 0 ）
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* @property {String ｜ Number} customNavHeight 自定义导航栏的高度 （h5 默认44 其他默认 0 ）
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* @property {Boolean} stickyToTop 是否开启吸顶功能 （默认 false ）
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* @property {String} bgColor 组件背景颜色（默认 '#ffffff' ）
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* @property {String ｜ Number} zIndex 吸顶时的z-index值
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* @property {String ｜ Number} index 自定义标识，用于区分是哪一个组件
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* @property {Object} customStyle 组件的样式，对象形式
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* @event {Function} fixed 组件吸顶时触发
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* @event {Function} unfixed 组件取消吸顶时触发
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* @example <u-sticky offsetTop="200"><view>塞下秋来风景异，衡阳雁去无留意</view></u-sticky>
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*/
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export default {
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name: 'su-sticky',
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props: {
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// 吸顶容器到顶部某个距离的时候，进行吸顶，在H5平台，NavigationBar为44px
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offsetTop: {
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type: [String, Number],
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default: 0,
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},
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// 自定义导航栏的高度
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customNavHeight: {
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type: [String, Number],
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// #ifdef H5
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// H5端的导航栏属于“自定义”导航栏的范畴，因为它是非原生的，与普通元素一致
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default: 44,
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// #endif
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// #ifndef H5
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default: sheep.$platform.navbar,
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// #endif
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},
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// 是否开启吸顶功能
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stickyToTop: {
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type: Boolean,
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default: false,
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},
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// 吸顶区域的背景颜色
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bgColor: {
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type: String,
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default: 'transparent',
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},
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// z-index值
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zIndex: {
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type: [String, Number],
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default: '',
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},
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// 列表中的索引值
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index: {
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type: [String, Number],
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default: '',
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},
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customStyle: {
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type: [Object, String],
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default: () => ({}),
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},
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},
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data() {
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return {
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cssSticky: false, // 是否使用css的sticky实现
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stickyTop: 0, // 吸顶的top值，因为可能受自定义导航栏影响，最终的吸顶值非offsetTop值
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elId: guid(),
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left: 0, // js模式时，吸顶的内容因为处于postition: fixed模式，为了和原来保持一致的样式，需要记录并重新设置它的left，height，width属性
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width: 'auto',
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height: 'auto',
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fixed: false, // js模式时，是否处于吸顶模式
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};
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},
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computed: {
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style() {
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const style = {};
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if (!this.stickyToTop) {
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if (this.cssSticky) {
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style.position = 'sticky';
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style.zIndex = this.uZindex;
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style.top = addUnit(this.stickyTop);
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} else {
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style.height = this.fixed ? this.height + 'px' : 'auto';
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}
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} else {
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// 无需吸顶时，设置会默认的relative(nvue)和非nvue的static静态模式即可
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// #ifdef APP-NVUE
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style.position = 'relative';
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// #endif
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// #ifndef APP-NVUE
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style.position = 'static';
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// #endif
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}
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style.backgroundColor = this.bgColor;
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return deepMerge(addStyle(this.customStyle), style);
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},
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// 吸顶内容的样式
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stickyContent() {
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const style = {};
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if (!this.cssSticky) {
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style.position = this.fixed ? 'fixed' : 'static';
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style.top = this.stickyTop + 'px';
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style.left = this.left + 'px';
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style.width = this.width == 'auto' ? 'auto' : this.width + 'px';
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style.zIndex = this.uZindex;
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}
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return style;
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},
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uZindex() {
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return this.zIndex ? this.zIndex : 970;
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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.getStickyTop();
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// 判断使用的模式
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this.checkSupportCssSticky();
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// 如果不支持css sticky，则使用js方案，此方案性能比不上css方案
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if (!this.cssSticky) {
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!this.stickyToTop && this.initObserveContent();
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}
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},
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$uGetRect(selector, all) {
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return new Promise((resolve) => {
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uni.createSelectorQuery()
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.in(this)
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[all ? 'selectAll' : 'select'](selector)
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.boundingClientRect((rect) => {
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if (all && Array.isArray(rect) && rect.length) {
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resolve(rect);
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}
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if (!all && rect) {
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resolve(rect);
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}
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})
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.exec();
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});
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},
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initObserveContent() {
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// 获取吸顶内容的高度，用于在js吸顶模式时，给父元素一个填充高度，防止"塌陷"
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this.$uGetRect('#' + this.elId).then((res) => {
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this.height = res.height;
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this.left = res.left;
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this.width = res.width;
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this.$nextTick(() => {
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this.observeContent();
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});
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});
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},
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observeContent() {
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// 先断掉之前的观察
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this.disconnectObserver('contentObserver');
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const contentObserver = uni.createIntersectionObserver({
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// 检测的区间范围
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thresholds: [0.95, 0.98, 1],
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});
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// 到屏幕顶部的高度时触发
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contentObserver.relativeToViewport({
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top: -this.stickyTop,
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});
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// 绑定观察的元素
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contentObserver.observe(`#${this.elId}`, (res) => {
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this.setFixed(res.boundingClientRect.top);
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});
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this.contentObserver = contentObserver;
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},
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setFixed(top) {
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// 判断是否出于吸顶条件范围
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const fixed = top <= this.stickyTop;
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this.fixed = fixed;
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},
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disconnectObserver(observerName) {
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// 断掉观察，释放资源
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const observer = this[observerName];
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observer && observer.disconnect();
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},
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getStickyTop() {
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this.stickyTop = getPx(this.offsetTop) + getPx(this.customNavHeight);
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},
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async checkSupportCssSticky() {
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// #ifdef H5
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// H5，一般都是现代浏览器，是支持css sticky的，这里使用创建元素嗅探的形式判断
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if (this.checkCssStickyForH5()) {
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this.cssSticky = true;
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}
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// #endif
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// 如果安卓版本高于8.0，依然认为是支持css sticky的(因为安卓7在某些机型，可能不支持sticky)
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if (os() === 'android' && Number(sys().system) > 8) {
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this.cssSticky = true;
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}
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// APP-Vue和微信平台，通过computedStyle判断是否支持css sticky
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// #ifdef APP-VUE || MP-WEIXIN
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this.cssSticky = await this.checkComputedStyle();
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// #endif
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// ios上，从ios6开始，都是支持css sticky的
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if (os() === 'ios') {
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this.cssSticky = true;
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}
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// nvue，是支持css sticky的
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// #ifdef APP-NVUE
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this.cssSticky = true;
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// #endif
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},
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// 在APP和微信小程序上，通过uni.createSelectorQuery可以判断是否支持css sticky
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checkComputedStyle() {
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// 方法内进行判断，避免在其他平台生成无用代码
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// #ifdef APP-VUE || MP-WEIXIN
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return new Promise((resolve) => {
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uni.createSelectorQuery()
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.in(this)
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.select('.u-sticky')
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.fields({
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computedStyle: ['position'],
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})
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.exec((e) => {
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resolve('sticky' === e[0].position);
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});
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});
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// #endif
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},
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// H5通过创建元素的形式嗅探是否支持css sticky
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// 判断浏览器是否支持sticky属性
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checkCssStickyForH5() {
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// 方法内进行判断，避免在其他平台生成无用代码
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// #ifdef H5
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const vendorList = ['', '-webkit-', '-ms-', '-moz-', '-o-'],
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vendorListLength = vendorList.length,
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stickyElement = document.createElement('div');
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for (let i = 0; i < vendorListLength; i++) {
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stickyElement.style.position = vendorList[i] + 'sticky';
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if (stickyElement.style.position !== '') {
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return true;
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}
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}
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return false;
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// #endif
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},
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},
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beforeDestroy() {
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this.disconnectObserver('contentObserver');
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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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.u-sticky {
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/* #ifdef APP-VUE || MP-WEIXIN */
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// 此处默认写sticky属性，是为了给微信和APP通过uni.createSelectorQuery查询是否支持css sticky使用
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position: sticky;
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/* #endif */
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}
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</style>
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