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| <template>
| <view class="tn-sticky-class">
| <view
| class="tn-sticky__wrap"
| :class="[stickyClass]"
| :style="[stickyStyle]"
| >
| <view
| class="tn-sticky__item"
| :style="{
| position: fixed ? 'fixed' : 'static',
| top: stickyTop + 'px',
| left: left + 'px',
| width: width === 'auto' ? 'auto' : width + 'px',
| zIndex: elZIndex
| }"
| >
| <slot></slot>
| </view>
| </view>
| </view>
| </template>
|
| <script>
| export default {
| name: 'tn-sticky',
| props: {
| // 吸顶容器到顶部某个距离的时候进行吸顶
| // 在H5中，customNavBar的高度为45px
| offsetTop: {
| type: Number,
| default: 0
| },
| // H5顶部导航栏的高度
| h5NavHeight: {
| type: Number,
| default: 45
| },
| // 自定义顶部导航栏高度
| customNavHeight: {
| type: Number,
| default: 0
| },
| // 是否开启吸顶
| enabled: {
| type: Boolean,
| default: true
| },
| // 吸顶容器的背景颜色
| backgroundColor: {
| type: String,
| default: '#FFFFFF'
| },
| // z-index
| zIndex: {
| type: Number,
| default: 0
| },
| // 索引值，区分不同的吸顶组件
| index: {
| type: [String, Number],
| default: ''
| }
| },
| computed: {
| elZIndex() {
| return this.zIndex ? this.zIndex : this.$t.zIndex.sticky
| },
| backgroundColorStyle() {
| return this.$t.color.getBackgroundColorStyle(this.backgroundColor)
| },
| backgroundColorClass() {
| return this.$t.color.getBackgroundColorInternalClass(this.backgroundColor)
| },
| stickyClass() {
| let clazz = ''
| clazz += this.elClass
| if (this.backgroundColorClass) {
| clazz += ` ${this.backgroundColorClass}`
| }
| return clazz
| },
| stickyStyle() {
| let style = {}
| style.height = this.fixed ? this.height + 'px' : 'auto'
| if (this.backgroundColorStyle) {
| style.color = this.backgroundColorStyle
| }
| if (this.elZIndex) {
| style.zIndex = this.elZIndex
| }
| return style
| }
| },
| data() {
| return {
| // 监听组件别名
| stickyObserverName: 'tnStickyObserver',
| // 组件的唯一编号
| elClass: this.$t.uuid(),
| // 是否固定
| fixed: false,
| // 高度
| height: 'auto',
| // 宽度
| width: 'auto',
| // 距离顶部的距离
| stickyTop: 0,
| // 左边距离
| left: 0
| }
| },
| watch: {
| offsetTop(val) {
| this.initObserver()
| },
| enabled(val) {
| if (val === false) {
| this.fixed = false
| this.disconnectObserver(this.stickyObserverName)
| } else {
| this.initObserver()
| }
| },
| customNavHeight(val) {
| this.initObserver()
| }
| },
| mounted() {
| this.initObserver()
| },
| methods: {
| // 初始化监听组件的布局状态
| initObserver() {
| if (!this.enabled) return
| // #ifdef H5
| this.stickyTop = this.offsetTop != 0 ? uni.upx2px(this.offsetTop) + this.h5NavHeight : this.h5NavHeight
| // #endif
| // #ifndef H5
| this.stickyTop = this.offsetTop != 0 ? uni.upx2px(this.offsetTop) + this.customNavHeight : this.customNavHeight
| // #endif
|
| this.disconnectObserver(this.stickyObserverName)
| this._tGetRect('.' + this.elClass).then((res) => {
| this.height = res.height
| this.left = res.left
| this.width = res.width
| this.$nextTick(() => {
| this.connectObserver()
| })
| })
| },
| // 监听组件的布局状态
| connectObserver() {
| this.disconnectObserver(this.stickyObserverName)
| // 组件内获取布局状态，不能用uni.createIntersectionObserver，而必须用this.createIntersectionObserver
| const contentObserver = this.createIntersectionObserver({
| thresholds: [0.95, 0.98, 1]
| })
| contentObserver.relativeToViewport({
| top: -this.stickyTop
| })
| contentObserver.observe('.' + this.elClass, res => {
| if (!this.enabled) return
| this.setFixed(res.boundingClientRect.top)
| })
| this[this.stickyObserverName] = contentObserver
| },
| // 设置是否固定
| setFixed(top) {
| const fixed = top < this.stickyTop
| if (fixed) this.$emit('fixed', this.index)
| else if (this.fixed) this.$emit('unfixed', this.index)
| this.fixed = fixed
| },
| // 停止监听组件的布局状态
| disconnectObserver(observerName) {
| const observer = this[observerName]
| observer && observer.disconnect()
| }
| }
| }
| </script>
|
| <style>
| </style>
|
|
