178 lines
4.9 KiB
Vue
178 lines
4.9 KiB
Vue
<template>
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<view>
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<view
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class="u-sticky-wrap"
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:class="[elClass, customClass]"
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:style="
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$u.toStyle(
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{
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height: fixed ? height + 'px' : 'auto',
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backgroundColor: bgColor
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},
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customStyle
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)
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"
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>
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<view
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class="u-sticky"
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:style="{
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position: fixed ? 'fixed' : 'static',
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top: stickyTop + 'px',
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left: left + 'px',
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width: width == 'auto' ? 'auto' : width + 'px',
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zIndex: uZIndex
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}"
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>
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<slot></slot>
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</view>
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</view>
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</view>
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</template>
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<script lang="ts">
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export default {
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name: 'u-sticky',
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options: {
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addGlobalClass: true,
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// #ifndef MP-TOUTIAO
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virtualHost: true,
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// #endif
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styleIsolation: 'shared'
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}
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};
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</script>
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<script setup lang="ts">
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import { ref, computed, watch, nextTick, onMounted, onBeforeUnmount, getCurrentInstance } from 'vue';
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import { $u } from '../..';
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import { StickyProps } from './types';
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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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* @tutorial https://uviewpro.cn/zh/components/sticky.html
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* @property {String|Number} offsetTop 吸顶时与顶部的距离，单位rpx（默认0）
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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 {Boolean} enable 是否开启吸顶功能（默认true）
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* @property {String} bgColor 组件背景颜色（默认var(--u-bg-white)）
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* @property {String|Number} zIndex 吸顶时的z-index值（默认970）
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* @property {String|Number} h5NavHeight 导航栏高度，自定义导航栏时(无导航栏时需设置为0)，需要传入此值，单位px（默认44）
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* @event fixed 组件吸顶时触发
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* @event unfixed 组件取消吸顶时触发
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* @example <u-sticky offset-top="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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const props = defineProps(StickyProps);
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const emit = defineEmits(['fixed', 'unfixed']);
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const instance = getCurrentInstance();
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const fixed = ref(false);
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const height = ref<'auto' | number>('auto');
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const stickyTop = ref(0);
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const elClass = ref('');
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const left = ref(0);
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const width = ref<'auto' | number>('auto');
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let contentObserver: any = null;
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elClass.value = $u.guid();
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const uZIndex = computed(() => (props.zIndex ? props.zIndex : ($u?.zIndex?.sticky ?? 970)));
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watch(
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() => props.offsetTop,
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() => {
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initObserver();
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}
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);
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watch(
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() => props.enable,
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val => {
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if (val == false) {
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fixed.value = false;
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disconnectObserver('contentObserver');
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} else {
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initObserver();
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}
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}
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);
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onMounted(() => {
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initObserver();
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});
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onBeforeUnmount(() => {
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disconnectObserver('contentObserver');
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});
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/**
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* 初始化 IntersectionObserver 监听
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*/
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function initObserver() {
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if (!props.enable) return;
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// #ifdef H5
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stickyTop.value =
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Number(props.offsetTop) !== 0
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? uni.upx2px(Number(props.offsetTop)) + Number(props.h5NavHeight)
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: Number(props.h5NavHeight);
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// #endif
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// #ifndef H5
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stickyTop.value = Number(props.offsetTop) !== 0 ? uni.upx2px(Number(props.offsetTop)) : 0;
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// #endif
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disconnectObserver('contentObserver');
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$u.getRect('.' + elClass.value, instance).then((res: any) => {
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height.value = res.height;
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left.value = res.left;
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width.value = res.width;
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nextTick(() => {
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observeContent();
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});
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});
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}
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/**
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* 创建 IntersectionObserver 监听内容区域
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*/
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function observeContent() {
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disconnectObserver('contentObserver');
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contentObserver = uni.createIntersectionObserver(instance?.proxy, {
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thresholds: [0.95, 0.98, 1]
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});
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contentObserver.relativeToViewport({
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top: -stickyTop.value
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});
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contentObserver.observe('.' + elClass.value, (res: any) => {
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if (!props.enable) return;
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setFixed(res.boundingClientRect.top);
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});
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}
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/**
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* 设置 fixed 状态
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*/
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function setFixed(top: number) {
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const isFixed = top < stickyTop.value;
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if (isFixed) emit('fixed', props.index);
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else if (fixed.value) emit('unfixed', props.index);
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fixed.value = isFixed;
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}
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/**
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* 断开 observer
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*/
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function disconnectObserver(observerName: string) {
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if (observerName === 'contentObserver' && contentObserver) {
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contentObserver.disconnect();
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contentObserver = null;
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}
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}
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</script>
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<style scoped lang="scss">
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@import '../../libs/css/style.components.scss';
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.u-sticky {
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z-index: 9999999999;
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}
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</style>
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