109 lines
2.3 KiB
Vue
109 lines
2.3 KiB
Vue
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<template>
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<transition :name="transitionName">
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<div v-show="visible" :style="customStyle" class="back-to-ceiling" @click="backToTop">
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<i class="iconfont reco-up"></i>
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</div>
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</transition>
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</template>
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<script>
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export default {
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name: 'BackToTop',
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props: {
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visibilityHeight: {
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type: Number,
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default: 400
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},
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backPosition: {
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type: Number,
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default: 0
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},
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customStyle: {
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type: Object,
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default: function() {
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return {
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right: '1rem',
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bottom: '3rem',
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width: '2.5rem',
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height: '2.5rem',
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'border-radius': '.25rem',
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'line-height': '2.5rem',
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backgroundColor: 'rgba(231, 234, 241,.5)'
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}
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}
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},
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transitionName: {
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type: String,
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default: 'fade'
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}
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},
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data() {
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return {
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visible: false,
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interval: null,
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isMoving: false
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}
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},
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mounted() {
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window.addEventListener('scroll', this.handleScroll)
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},
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beforeDestroy() {
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window.removeEventListener('scroll', this.handleScroll)
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if (this.interval) {
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clearInterval(this.interval)
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}
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},
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methods: {
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handleScroll() {
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this.visible = window.pageYOffset > this.visibilityHeight
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},
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backToTop() {
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if (this.isMoving) return
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const start = window.pageYOffset
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let i = 0
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this.isMoving = true
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this.interval = setInterval(() => {
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const next = Math.floor(this.easeInOutQuad(10 * i, start, -start, 500))
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if (next <= this.backPosition) {
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window.scrollTo(0, this.backPosition)
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clearInterval(this.interval)
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this.isMoving = false
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} else {
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window.scrollTo(0, next)
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}
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i++
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}, 16.7)
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},
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easeInOutQuad(t, b, c, d) {
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if ((t /= d / 2) < 1) return c / 2 * t * t + b
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return -c / 2 * (--t * (t - 2) - 1) + b
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}
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}
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}
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</script>
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<style lang="stylus" scoped>
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.back-to-ceiling
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position: fixed;
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display: inline-block;
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text-align: center;
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cursor: pointer;
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i
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font-size 1.6rem
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color $accentColor
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.back-to-ceiling:hover {
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background: #d5dbe7;
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}
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.fade-enter-active,
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.fade-leave-active {
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transition: opacity .5s;
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}
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.fade-enter,
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.fade-leave-to {
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opacity: 0
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}
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.back-to-ceiling .Icon {
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fill: #9aaabf;
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background: none;
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}
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</style>
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