175 lines
3.1 KiB
Vue
175 lines
3.1 KiB
Vue
<!-- src/components/itemCenter.vue -->
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<template>
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<div style="position: relative; width: 100%" ref="containerRef">
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<!-- 背景图 -->
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<img
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v-if="shouldShowImage"
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v-smart-img.noFade
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:src="imgUrl"
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:class="flip ? 'flipImg' : ''"
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alt=""
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style="width: 100%; height: 100%; display: block"
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/>
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<div
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v-else
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class="placeholder"
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:style="{
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width: '100%',
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height: '100%',
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backgroundColor: 'transparent',
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}"
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></div>
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<!-- 内容 -->
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<div
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class="scrollY"
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style="
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position: absolute;
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inset: 0;
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display: flex;
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justify-content: center;
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align-items: center;
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"
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:style="contentStyle"
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>
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<slot></slot>
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</div>
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</div>
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</template>
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<script setup>
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import { ref, onMounted, computed, onUnmounted, watch } from 'vue'
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const props = defineProps({
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imgUrl: {
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type: String,
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default: '',
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required: true,
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},
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contentStyle: {
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type: String,
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default: '',
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},
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// 懒加载预加载范围
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rootMargin: {
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type: String,
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default: '100px',
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},
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// 是否翻转图片
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flip: {
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type: Boolean,
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default: false,
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},
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// 是否启用懒加载
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lazy: {
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type: Boolean,
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default: false,
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},
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// 是否立即显示（优先级高于lazy）
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immediate: {
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type: Boolean,
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default: false,
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},
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// 新增：父容器显示状态
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show: {
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type: Boolean,
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default: true,
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},
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})
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const containerRef = ref(null)
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const isVisible = ref(false)
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let observer = null
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// 是否应该显示图片
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const shouldShowImage = computed(() => {
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// 如果标记为立即显示或禁用懒加载，则直接显示
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if (props.immediate || !props.lazy) {
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return true
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}
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// 否则根据是否可见决定
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return isVisible.value
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})
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// 判断是否为OSS图片
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// const isOSSImage = computed(() => {
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// return (
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// props.imgUrl.startsWith('/oss/h5/Azizi/') ||
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// props.imgUrl.startsWith('https://cdn.azizichat.com/h5/Azizi/')
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// )
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// })
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// 创建交叉观察器
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const createObserver = () => {
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if (!props.lazy || props.immediate) return
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if (!containerRef.value) return
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// 清理旧观察者
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if (observer) {
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observer.disconnect()
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}
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observer = new IntersectionObserver(
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(entries) => {
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entries.forEach((entry) => {
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if (entry.isIntersecting) {
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isVisible.value = true
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observer.unobserve(entry.target)
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}
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})
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},
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{
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rootMargin: props.rootMargin, // 提前100px开始加载
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threshold: 0,
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},
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)
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observer.observe(containerRef.value)
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}
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onMounted(() => {
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createObserver()
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})
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// 监听 show 属性变化，重新创建观察者
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watch(
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() => props.show,
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(newVal) => {
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if (newVal && props.lazy && !props.immediate) {
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// 延迟执行，确保 DOM 已渲染
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setTimeout(() => {
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createObserver()
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}, 100)
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}
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},
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)
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onUnmounted(() => {
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if (observer) {
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observer.disconnect()
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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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.placeholder {
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transition: opacity 0.3s ease;
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}
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.scrollY::-webkit-scrollbar {
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display: none;
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}
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[dir='rtl'] .flipImg {
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transform: scaleX(-1);
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}
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</style>
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