mirror of
https://github.com/handsomezhuzhu/handsomezhuzhu.github.io.git
synced 2026-02-20 20:00:14 +00:00
153 lines
3.6 KiB
Vue
153 lines
3.6 KiB
Vue
<script setup lang="ts">
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import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
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import { useData, useRoute } from 'vitepress'
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const { isDark, frontmatter } = useData()
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const route = useRoute()
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// 图片配置
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const darkImages = [
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// '/bg.webp',
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'/bg2.webp',
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'/bg3.jpeg'
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]
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const lightImages = [
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'/bgw.webp',
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'/bgw2.jpeg'
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]
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const currentImages = computed(() => isDark.value ? darkImages : lightImages)
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const currentIndex = ref(0)
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const nextIndex = ref(1)
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// 控制显示的图片
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const activeImage = computed(() => currentImages.value[currentIndex.value])
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// const nextImage = computed(() => currentImages.value[nextIndex.value])
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// 简单的淡入淡出逻辑:
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// 我们使用 <transition> 包裹一个 div 作为背景
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// 也可以使用两个 div 叠加,一个 fadeOut 一个 fadeIn
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// 这里使用 Vue Transition Group 或 Key 切换
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// --- 配置区域 ---
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const INTERVAL_TIME = 15000 // 轮换间隔:5000ms = 5秒
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// ----------------
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let timer: any = null
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const startRotation = () => {
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stopRotation()
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timer = setInterval(() => {
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currentIndex.value = (currentIndex.value + 1) % currentImages.value.length
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}, INTERVAL_TIME)
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}
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const stopRotation = () => {
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if (timer) clearInterval(timer)
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}
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// 监听模式变化,重置索引,防止索引越界
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watch(isDark, () => {
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// 切换模式时,重置 index,确保展示对应模式的第一张图
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currentIndex.value = 0
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})
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const preloadImages = (images: string[]) => {
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images.forEach(src => {
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const img = new Image()
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img.src = src
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})
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}
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onMounted(() => {
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// 预加载所有图片
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preloadImages([...darkImages, ...lightImages])
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startRotation()
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})
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onUnmounted(() => {
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stopRotation()
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})
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// 只在首页显示
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const show = computed(() => frontmatter.value.layout === 'home')
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</script>
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<template>
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<ClientOnly>
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<div v-show="show" class="bg-slider-container">
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<transition name="bg-fade">
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<div
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:key="activeImage"
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class="bg-slide-item"
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:style="{ backgroundImage: `url(${activeImage})` }"
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></div>
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</transition>
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</div>
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</ClientOnly>
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</template>
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<style scoped>
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.bg-slider-container {
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position: fixed;
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top: 0;
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left: 0;
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width: 100vw;
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height: 100vh;
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z-index: -10; /* 放在最底层 */
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pointer-events: none;
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overflow: hidden;
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}
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.bg-slide-item {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background-size: cover;
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background-position: center;
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/* 保持与原主题一致的暗度调整,如果需要的话。
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原主题是在 .VPHome 上盖了一层渐变,所以这里只需要纯图片。
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*/
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}
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/* Vue Transition 动画 */
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.bg-fade-enter-active {
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transition: opacity 1.5s ease;
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z-index: 2; /* 新图片在最上面 */
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}
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.bg-fade-leave-active {
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/* 旧图片保持显示,直到被新图片覆盖 */
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transition: opacity 1.5s ease;
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z-index: 1; /* 旧图片在中间 */
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}
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.bg-fade-enter-from {
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opacity: 0;
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}
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.bg-fade-enter-to {
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opacity: 1;
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}
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.bg-fade-leave-from {
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opacity: 1;
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}
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.bg-fade-leave-to {
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/* 旧图片保持不透明(或者可以设为 0 但在 enter 之后)
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这里设为 0,因为如果 enter 是 opacity 1,它覆盖在上面。
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如果设为 1,可能会在 transition 结束后突然消失,如果新图片有透明度的话。
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但我们的图片是背景图,理论上是不透明的。
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为了保险,我们让旧图片淡出,但新图片覆盖在上面。
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如果新图片淡入 (0->1) 同时旧图片淡出 (1->0),中间时刻 (0.5+0.5) 可能会透。
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所以策略是:旧图片 保持 1 (或极慢淡出),新图片 淡入。
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*/
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opacity: 1;
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}
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</style>
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