mirror of
https://github.com/pengzhanbo/vuepress-theme-plume.git
synced 2026-04-23 10:58:13 +08:00
65 lines
1.3 KiB
Vue
65 lines
1.3 KiB
Vue
<script lang="ts" setup>
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import { debounce } from 'ts-debounce'
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import { onMounted, ref } from 'vue'
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import { getScrollTop, scrollTo } from '../utils'
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import { BackTopIcon } from './icons'
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const opacity = ref<number>(0)
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const MAX_TOP = 300
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const canShow = debounce((): void => {
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opacity.value = getScrollTop(document) >= MAX_TOP ? 1 : 0
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})
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const scrollToTop = (): void => {
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scrollTo(document, 0)
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}
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onMounted(() => {
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canShow()
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window.addEventListener('scroll', () => canShow(), false)
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})
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</script>
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<template>
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<div class="btn-back-top" :style="{ opacity: opacity }" @click="scrollToTop">
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<BackTopIcon />
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</div>
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</template>
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<style lang="scss">
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@import '../styles/variables';
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.btn-back-top {
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position: fixed;
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right: 3rem;
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bottom: 4.35rem;
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width: 3rem;
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height: 3rem;
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text-align: center;
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padding: 0.75rem 0;
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border-radius: 50%;
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background-color: var(--c-bg-container);
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box-shadow: var(--shadow-md);
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cursor: pointer;
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transition: opacity var(--t-color);
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z-index: 99;
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.back-top-icon {
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width: 1.75rem;
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height: 1.75rem;
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color: var(--c-brand);
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transition: color var(--t-color);
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}
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&:hover {
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.back-top-icon {
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color: var(--c-brand-light);
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}
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}
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}
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@media (max-width: $MQMobile) {
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.btn-back-top {
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right: 1.25rem;
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bottom: 2rem;
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}
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}
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</style>
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