101 lines
2.9 KiB
JavaScript
101 lines
2.9 KiB
JavaScript
// [z-paging]点击返回顶部view模块
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import u from '.././z-paging-utils'
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export default {
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props: {
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//自动显示点击返回顶部按钮，默认为否
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autoShowBackToTop: {
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type: Boolean,
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default: u.gc('autoShowBackToTop', false)
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},
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//点击返回顶部按钮显示/隐藏的阈值(滚动距离)，单位为px，默认为400rpx
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backToTopThreshold: {
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type: [Number, String],
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default: u.gc('backToTopThreshold', '400rpx')
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},
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//点击返回顶部按钮的自定义图片地址，默认使用z-paging内置的图片
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backToTopImg: {
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type: String,
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default: u.gc('backToTopImg', '')
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},
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//点击返回顶部按钮返回到顶部时是否展示过渡动画，默认为是
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backToTopWithAnimate: {
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type: Boolean,
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default: u.gc('backToTopWithAnimate', true)
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},
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//点击返回顶部按钮与底部的距离，注意添加单位px或rpx，默认为160rpx
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backToTopBottom: {
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type: [Number, String],
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default: u.gc('backToTopBottom', '160rpx')
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},
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//点击返回顶部按钮的自定义样式
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backToTopStyle: {
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type: Object,
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default: function() {
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return u.gc('backToTopStyle', {});
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},
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},
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//iOS点击顶部状态栏、安卓双击标题栏时，滚动条返回顶部，只支持竖向，默认为是
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enableBackToTop: {
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type: Boolean,
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default: u.gc('enableBackToTop', true)
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},
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},
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data() {
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return {
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backToTopClass: 'zp-back-to-top zp-back-to-top-hide',
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lastBackToTopShowTime: 0,
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showBackToTopClass: false,
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}
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},
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computed: {
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finalEnableBackToTop() {
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return this.usePageScroll ? false : this.enableBackToTop;
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},
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finalBackToTopThreshold() {
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return u.convertToPx(this.backToTopThreshold);
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},
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finalBackToTopStyle() {
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const backToTopStyle = this.backToTopStyle;
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if (!backToTopStyle.bottom) {
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backToTopStyle.bottom = this.windowBottom + u.convertToPx(this.backToTopBottom) + 'px';
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}
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if(!backToTopStyle.position){
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backToTopStyle.position = this.usePageScroll ? 'fixed': 'absolute';
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}
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return backToTopStyle;
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},
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},
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methods: {
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//点击返回顶部
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_backToTopClick() {
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!this.backToTopWithAnimate && this._checkShouldShowBackToTop(0);
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this.scrollToTop(this.backToTopWithAnimate);
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},
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//判断是否要显示返回顶部按钮
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_checkShouldShowBackToTop(scrollTop) {
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if (!this.autoShowBackToTop) {
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this.showBackToTopClass = false;
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return;
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}
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if (scrollTop > this.finalBackToTopThreshold) {
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if (!this.showBackToTopClass) {
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this.showBackToTopClass = true;
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this.lastBackToTopShowTime = new Date().getTime();
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setTimeout(() => {
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this.backToTopClass = 'zp-back-to-top zp-back-to-top-show';
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}, 300)
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}
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} else {
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if (this.showBackToTopClass) {
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this.backToTopClass = 'zp-back-to-top zp-back-to-top-hide';
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setTimeout(() => {
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this.showBackToTopClass = false;
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}, new Date().getTime() - this.lastBackToTopShowTime < 500 ? 0 : 300)
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}
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}
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},
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}
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}
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