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154 lines
3.3 KiB
154 lines
3.3 KiB
3 years ago
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<template>
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<view @tap="backToTop" class="u-back-top" :class="['u-back-top--mode--' + mode]" :style="[{
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bottom: bottom + 'rpx',
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right: right + 'rpx',
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borderRadius: mode == 'circle' ? '10000rpx' : '8rpx',
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zIndex: uZIndex,
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opacity: opacity
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}, customStyle]">
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<view class="u-back-top__content" v-if="!$slots.default && !$slots.$default">
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<u-icon @click="backToTop" :name="icon" :custom-style="iconStyle"></u-icon>
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<view class="u-back-top__content__tips">
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{{tips}}
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</view>
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</view>
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<slot v-else />
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</view>
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</template>
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<script>
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export default {
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name: 'u-back-top',
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props: {
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// 返回顶部的形状，circle-圆形，square-方形
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mode: {
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type: String,
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default: 'circle'
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},
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// 自定义图标
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icon: {
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type: String,
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default: 'arrow-upward'
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},
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// 提示文字
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tips: {
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type: String,
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default: ''
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},
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// 返回顶部滚动时间
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duration: {
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type: [Number, String],
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default: 100
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},
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// 滚动距离
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scrollTop: {
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type: [Number, String],
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default: 0
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},
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// 距离顶部多少距离显示，单位rpx
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top: {
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type: [Number, String],
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default: 400
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},
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// 返回顶部按钮到底部的距离，单位rpx
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bottom: {
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type: [Number, String],
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default: 200
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},
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// 返回顶部按钮到右边的距离，单位rpx
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right: {
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type: [Number, String],
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default: 40
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},
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// 层级
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zIndex: {
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type: [Number, String],
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default: '9'
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},
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// 图标的样式，对象形式
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iconStyle: {
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type: Object,
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default() {
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return {
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color: '#909399',
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fontSize: '38rpx'
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}
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}
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},
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// 整个组件的样式
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customStyle: {
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type: Object,
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default() {
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return {}
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}
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}
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},
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watch: {
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showBackTop(nVal, oVal) {
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// 当组件的显示与隐藏状态发生跳变时，修改组件的层级和不透明度
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// 让组件有显示和消失的动画效果，如果用v-if控制组件状态，将无设置动画效果
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if(nVal) {
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this.uZIndex = this.zIndex;
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this.opacity = 1;
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} else {
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this.uZIndex = -1;
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this.opacity = 0;
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}
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}
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},
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computed: {
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showBackTop() {
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// 由于scrollTop为页面的滚动距离，默认为px单位，这里将用于传入的top(rpx)值
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// 转为px用于比较，如果滚动条到顶的距离大于设定的距离，就显示返回顶部的按钮
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return this.scrollTop > uni.upx2px(this.top);
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},
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},
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data() {
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return {
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// 不透明度，为了让组件有一个显示和隐藏的过渡动画
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opacity: 0,
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// 组件的z-index值，隐藏时设置为-1，就会看不到
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uZIndex: -1
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}
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},
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methods: {
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backToTop() {
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uni.pageScrollTo({
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scrollTop: 0,
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duration: this.duration
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});
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}
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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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@import "../../libs/css/style.components.scss";
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.u-back-top {
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width: 80rpx;
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height: 80rpx;
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position: fixed;
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z-index: 9;
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@include vue-flex;
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flex-direction: column;
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justify-content: center;
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background-color: #E1E1E1;
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color: $u-content-color;
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align-items: center;
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transition: opacity 0.4s;
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&__content {
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@include vue-flex;
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flex-direction: column;
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align-items: center;
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&__tips {
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font-size: 24rpx;
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transform: scale(0.8);
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line-height: 1;
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}
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}
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}
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</style>
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