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/** * sticky 吸顶 * @description 该组件与CSS中position: sticky属性实现的效果一致,当组件达到预设的到顶部距离时, 就会固定在指定位置,组件位置大于预设的顶部距离时,会重新按照正常的布局排列。 * @tutorial https://www.uviewui.com/components/sticky.html * @property {String | Number} offsetTop 吸顶时与顶部的距离,单位px(默认 0 ) * @property {String | Number} customNavHeight 自定义导航栏的高度 (h5 默认44 其他默认 0 ) * @property {Boolean} disabled 是否开启吸顶功能 (默认 false ) * @property {String} bgColor 组件背景颜色(默认 '#ffffff' ) * @property {String | Number} zIndex 吸顶时的z-index值 * @property {String | Number} index 自定义标识,用于区分是哪一个组件 * @property {Object} customStyle 组件的样式,对象形式 * @event {Function} fixed 组件吸顶时触发 * @event {Function} unfixed 组件取消吸顶时触发 * @example <u-sticky offsetTop="200"><view>塞下秋来风景异,衡阳雁去无留意</view></u-sticky> */var _default = { name: 'u-sticky', mixins: [uni.$u.mpMixin, uni.$u.mixin, _props.default], data: function data() { return { cssSticky: false, // 是否使用css的sticky实现 stickyTop: 0, // 吸顶的top值,因为可能受自定义导航栏影响,最终的吸顶值非offsetTop值 elId: uni.$u.guid(), left: 0, // js模式时,吸顶的内容因为处于postition: fixed模式,为了和原来保持一致的样式,需要记录并重新设置它的left,height,width属性 width: 'auto', height: 'auto', fixed: false // js模式时,是否处于吸顶模式 }; }, computed: { style: function style() { var style = {}; if (!this.disabled) { if (this.cssSticky) { style.position = 'sticky'; style.zIndex = this.uZindex; style.top = uni.$u.addUnit(this.stickyTop); } else { style.height = this.fixed ? this.height + 'px' : 'auto'; } } else { // 无需吸顶时,设置会默认的relative(nvue)和非nvue的static静态模式即可 style.position = 'static'; } style.backgroundColor = this.bgColor; return uni.$u.deepMerge(uni.$u.addStyle(this.customStyle), style); }, // 吸顶内容的样式 stickyContent: function stickyContent() { var style = {}; if (!this.cssSticky) { style.position = this.fixed ? 'fixed' : 'static'; style.top = this.stickyTop + 'px'; style.left = this.left + 'px'; style.width = this.width == 'auto' ? 'auto' : this.width + 'px'; style.zIndex = this.uZindex; } return style; }, uZindex: function uZindex() { return this.zIndex ? this.zIndex : uni.$u.zIndex.sticky; } }, mounted: function mounted() { this.init(); }, methods: { init: function init() { this.getStickyTop(); // 判断使用的模式 this.checkSupportCssSticky(); // 如果不支持css sticky,则使用js方案,此方案性能比不上css方案 if (!this.cssSticky) { !this.disabled && this.initObserveContent(); } }, initObserveContent: function initObserveContent() {var _this = this; // 获取吸顶内容的高度,用于在js吸顶模式时,给父元素一个填充高度,防止"塌陷" this.$uGetRect('#' + this.elId).then(function (res) { _this.height = res.height; _this.left = res.left; _this.width = res.width; _this.$nextTick(function () { _this.observeContent(); }); }); }, observeContent: function observeContent() {var _this2 = this; // 先断掉之前的观察 this.disconnectObserver('contentObserver'); var contentObserver = uni.createIntersectionObserver({ // 检测的区间范围 thresholds: [0.95, 0.98, 1] }); // 到屏幕顶部的高度时触发 contentObserver.relativeToViewport({ top: -this.stickyTop }); 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