406 lines
14 KiB
Vue
406 lines
14 KiB
Vue
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<template>
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<view class="tabs">
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<u-sticky :enable="isFixed" :bg-color="stickyBgColor" :offset-top="top" :h5-nav-height="0">
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<view :id="id" :style="{
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background: bgColor
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}">
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<scroll-view :style="{height: height + 'rpx'}" scroll-x class="scroll-view" :scroll-left="scrollLeft"
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scroll-with-animation>
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<view class="scroll-box" :class="{'tabs-scorll-flex': !isScroll}">
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<view class="tab-item line1" :id="'tab-item-' + index" v-for="(item, index) in list"
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:key="index" @tap="clickTab(index)" :style="[tabItemStyle(index)]">
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<u-badge :count="item[count] || item['dot'] || 0" :offset="offset" size="mini"></u-badge>
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{{ item[name] || item['name']}}
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</view>
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<view v-if="showBar" class="tab-bar" :style="[tabBarStyle]"></view>
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</view>
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</scroll-view>
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</view>
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</u-sticky>
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<view class="tab-content" @touchstart="onTouchStart" @touchmove="onTouchMove" @touchcancel="onTouchEnd" @touchend="onTouchEnd">
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<!-- <view class="tab-track" :class="{'tab-animated': animated}" :style="[trackStyle]"> -->
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<view>
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<slot></slot>
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</view>
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<!-- </view> -->
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</view>
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</view>
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</template>
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<script lang="ts" setup>
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import { getRect } from '@/utils/util'
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import { ref, reactive, computed, watch, provide, nextTick, onMounted, getCurrentInstance } from "vue"
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import { useTouch } from "@/hooks/useTouch"
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// Touch 钩子
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const { touch, resetTouchStatus, touchStart, touchMove } = useTouch()
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const emit = defineEmits<{
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(event: 'change', value: number): void
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}>()
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const props = withDefaults(defineProps < {
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isScroll ? : boolean // 导航菜单是否需要滚动，如只有2或者3个的时候，就不需要滚动了，此时使用flex平分tab的宽度
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current ? : number | string // 当前活动tab的索引
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height ? : number | string // 导航栏的高度和行高
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fontSize ? : number | string // 字体大小
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duration ? : number | string // 过渡动画时长, 单位ms
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activeColor ? : number | string // 选中项的主题颜色
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inactiveColor ? : number | string // 未选中项的颜色
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barWidth ? : number | string // 菜单底部移动的bar的宽度，单位rpx
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barHeight ? : number // 移动bar的高度
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gutter ? : number | string // 单个tab的左或有内边距（左右相同）
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bgColor ? : number | string // 导航栏的背景颜色
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name ? : string // 读取传入的数组对象的属性(tab名称)
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count ? : string // 读取传入的数组对象的属性(徽标数)
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offset ? : number[] // 徽标数位置偏移
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bold ? : boolean // 活动tab字体是否加粗
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activeItemStyle ? : any // 当前活动tab item的样式
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showBar ? : boolean // 是否显示底部的滑块
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barStyle ? : any // 底部滑块的自定义样式
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itemWidth ? : string // 标签的宽度
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isFixed ? : boolean // 吸顶是否固定
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top ? : number | string // 吸顶顶部距离
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stickyBgColor ? : string // 吸顶颜色
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swipeable: boolean // 是否允许滑动切换
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// animated: boolean // 切换动画
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} > (), {
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isScroll: true,
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current: 0,
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height: 80,
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fontSize: 28,
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duration: 0.3,
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activeColor: '#2073F4',
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inactiveColor: '#333',
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barWidth: 40,
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barHeight: 4,
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gutter: 30,
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bgColor: '#FFFFFF',
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name: 'name',
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count: 'count',
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offset: [5, 20],
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bold: true,
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activeItemStyle: {},
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showBar: true,
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barStyle: {},
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itemWidth: 'auto',
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isFixed: false,
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top: 0,
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stickyBgColor: '#FFFFFF',
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swipeable: true,
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// animated: true
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})
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const list = ref<any>([])
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const childrens = ref<any>([])
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const scrollLeft = ref<number>(0) // 滚动scroll-view的左边滚动距离
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const tabQueryInfo = ref<any>([]) // 存放对tab菜单查询后的节点信息
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const componentWidth = ref<number>(0) // 屏幕宽度，单位为px
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const scrollBarLeft = ref<number>(0) // 移动bar需要通过translateX()移动的距离
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const parentLeft = ref<number>(0) // 父元素(tabs组件)到屏幕左边的距离
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const id = ref<string>('cu-tab') // id值
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const currentIndex = ref<any>(props.current)
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const barFirstTimeMove = ref<boolean>(true)// 滑块第一次移动时(页面刚生成时)，无需动画，否则给人怪异的感觉
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const swiping = ref<boolean>(false)
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//@ts-ignore
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const { ctx } = getCurrentInstance()
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// 监听tab的变化，重新计算tab菜单的布局信息，因为实际使用中菜单可能是通过
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// 后台获取的（如新闻app顶部的菜单），获取返回需要一定时间，所以list变化时，重新获取布局信息
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watch(() => list.value, async (n, o) => {
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// list变动时，重制内部索引，否则可能导致超出数组边界的情况
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if(!barFirstTimeMove.value && n.length !== o.length) {
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currentIndex.value = 0;
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}
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// 用$nextTick等待视图更新完毕后再计算tab的局部信息，否则可能因为tab还没生成就获取，就会有问题
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await nextTick();
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init();
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})
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watch(() => props.current, (nVal, oVal) => {
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// 视图更新后再执行移动操作、
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nextTick(() => {
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currentIndex.value = nVal;
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scrollByIndex();
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});
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}, { immediate: true })
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// 移动bar的样式
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const tabBarStyle = computed(() => {
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let style = {
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width: props.barWidth + 'rpx',
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transform: `translate(${scrollBarLeft.value}px, -100%)`,
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// 滑块在页面渲染后第一次滑动时，无需动画效果
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'transition-duration': `${barFirstTimeMove.value ? 0 : props.duration }s`,
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'background-color': props.activeColor,
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height: props.barHeight + 'rpx',
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opacity: barFirstTimeMove.value ? 0 : 1,
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// 设置一个很大的值，它会自动取能用的最大值，不用高度的一半，是因为高度可能是单数，会有小数出现
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'border-radius': `${props.barHeight / 2}px`
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};
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Object.assign(style, props.barStyle);
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return style;
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})
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// tab的样式
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const tabItemStyle = computed(() => {
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return (index) => {
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let style: any = {
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height: props.height + 'rpx',
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'line-height': props.height + 'rpx',
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'font-size': props.fontSize + 'rpx',
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padding: props.isScroll ? `0 ${props.gutter}rpx` : '',
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flex: props.isScroll ? 'auto' : '1',
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width: `${props.itemWidth}rpx`
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};
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// 字体加粗
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if (index == currentIndex.value && props.bold) style.fontWeight = 'bold';
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if (index == currentIndex.value) {
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style.color = props.activeColor;
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// 给选中的tab item添加外部自定义的样式
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style = Object.assign(style, props.activeItemStyle);
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} else {
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style.color = props.inactiveColor;
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}
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return style;
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}
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})
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// const trackStyle = computed(() => {
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// if (!props.animated) return ''
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// return {
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// left: -100 * currentIndex.value + '%',
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// 'transition-duration': props.duration + 's',
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// '-webkit-transition-duration': props.duration + 's',
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// }
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// })
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const updateTabs = () => {
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list.value = childrens.value.map((item) => {
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const {
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name,
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dot,
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active,
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inited,
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} = item.event
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const { updateRender } = item
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return {
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name,
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dot,
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active,
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inited,
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updateRender
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}
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})
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// nextTick(() => {
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// init()
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// })
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}
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// 设置一个init方法，方便多处调用
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const init = async () => {
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// 获取tabs组件的尺寸信息
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let tabRect = await getRect('#' + id.value, false, ctx);
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// tabs组件距离屏幕左边的宽度
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parentLeft.value = tabRect.left;
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// tabs组件的宽度
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componentWidth.value = tabRect.width;
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getTabRect();
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}
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// 点击某一个tab菜单
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const clickTab = (index) => {
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// 点击当前活动tab，不触发事件
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if (index == currentIndex.value) return;
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nextTick(() => {
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currentIndex.value = index;
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scrollByIndex();
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});
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// 发送事件给父组件
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emit('change', index);
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}
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// 查询tab的布局信息
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const getTabRect = () => {
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// 创建节点查询
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let query: any = uni.createSelectorQuery().in(ctx);
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// 历遍所有tab，这里是执行了查询，最终使用exec()会一次性返回查询的数组结果
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for (let i = 0; i < list.value.length; i++) {
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// 只要size和rect两个参数
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query.select(`#tab-item-${i}`).fields({
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size: true,
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rect: true
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});
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}
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// 执行查询，一次性获取多个结果
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query.exec((res) => {
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tabQueryInfo.value = res;
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// 初始化滚动条和移动bar的位置
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scrollByIndex();
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});
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}
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// 滚动scroll-view，让活动的tab处于屏幕的中间位置
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const scrollByIndex = () => {
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// 当前活动tab的布局信息，有tab菜单的width和left(为元素左边界到父元素左边界的距离)等信息
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let tabInfo = tabQueryInfo.value[currentIndex.value];
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if (!tabInfo) return;
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// 活动tab的宽度
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let tabWidth = tabInfo.width;
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// 活动item的左边到tabs组件左边的距离，用item的left减去tabs的left
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let offsetLeft = tabInfo.left - parentLeft.value;
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// 将活动的tabs-item移动到屏幕正中间，实际上是对scroll-view的移动
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let scrollLefts = offsetLeft - (componentWidth.value - tabWidth) / 2;
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scrollLeft.value = scrollLefts < 0 ? 0 : scrollLefts;
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// 当前活动item的中点点到左边的距离减去滑块宽度的一半，即可得到滑块所需的移动距离
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let left = tabInfo.left + tabInfo.width / 2 - parentLeft.value;
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// 计算当前活跃item到组件左边的距离
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scrollBarLeft.value = left - uni.upx2px(props.barWidth) / 2;
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// 第一次移动滑块的时候，barFirstTimeMove为true，放到延时中将其设置false
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// 延时是因为scrollBarLeft作用于computed计算时，需要一个过程需，否则导致出错
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if (barFirstTimeMove.value == true) {
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setTimeout(() => {
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barFirstTimeMove.value = false;
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}, 100)
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}
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// 更新子组件的显示
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childrens.value.forEach((item, ind) => {
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let active = ind === currentIndex.value;
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if (active !== item.event.active || !item.event.inited) {
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item.updateRender(active);
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}
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});
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}
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// 子组件调用此函数而产生的事件通信
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const handleChange = (event, updateRender) => {
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childrens.value.push({event: event, updateRender})
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}
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// 手指触摸
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const onTouchStart = (event) => {
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if (!props.swipeable)
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return;
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swiping.value = true;
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touchStart(event);
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}
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// 手指滑动
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const onTouchMove = (event) => {
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if (!props.swipeable || !swiping.value)
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return;
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touchMove(event);
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}
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// 手指滑动结束
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const onTouchEnd = () => {
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if (!props.swipeable || !swiping.value)
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return;
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const minSwipeDistance = 50;
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if (touch.direction === 'horizontal' && touch.offsetX >= minSwipeDistance) {
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let index, len = list.value.length, curIndex = currentIndex.value;
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if (touch.deltaX <= 0) {
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curIndex >= (len - 1) ? index = 0 : index = curIndex + 1
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} else {
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curIndex <= 0 ? index = (len - 1) : index = curIndex - 1
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}
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nextTick(() => {
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currentIndex.value = index;
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scrollByIndex();
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});
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// 发送事件给父组件
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emit('change', index);
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|
}
|
|||
|
|
swiping.value = false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
onMounted(() => {
|
|||
|
|
updateTabs();
|
|||
|
|
})
|
|||
|
|
|
|||
|
|
|
|||
|
|
provide('handleChange', handleChange)
|
|||
|
|
provide('updateTabs', updateTabs)
|
|||
|
|
</script>
|
|||
|
|
|
|||
|
|
<style lang="scss" scoped>
|
|||
|
|
/* #ifndef APP-NVUE */
|
|||
|
|
::-webkit-scrollbar,
|
|||
|
|
::-webkit-scrollbar,
|
|||
|
|
::-webkit-scrollbar {
|
|||
|
|
display: none;
|
|||
|
|
width: 0 !important;
|
|||
|
|
height: 0 !important;
|
|||
|
|
-webkit-appearance: none;
|
|||
|
|
background: transparent;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* #endif */
|
|||
|
|
|
|||
|
|
.scroll-box {
|
|||
|
|
height: 100%;
|
|||
|
|
position: relative;
|
|||
|
|
/* #ifdef MP-TOUTIAO */
|
|||
|
|
white-space: nowrap;
|
|||
|
|
/* #endif */
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.tab-fixed {
|
|||
|
|
position: sticky;
|
|||
|
|
top: 0;
|
|||
|
|
width: 100%;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* #ifdef H5 */
|
|||
|
|
// 通过样式穿透，隐藏H5下，scroll-view下的滚动条
|
|||
|
|
scroll-view ::v-deep ::-webkit-scrollbar {
|
|||
|
|
display: none;
|
|||
|
|
width: 0 !important;
|
|||
|
|
height: 0 !important;
|
|||
|
|
-webkit-appearance: none;
|
|||
|
|
background: transparent;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* #endif */
|
|||
|
|
|
|||
|
|
.scroll-view {
|
|||
|
|
width: 100%;
|
|||
|
|
white-space: nowrap;
|
|||
|
|
position: relative;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.tab-item {
|
|||
|
|
position: relative;
|
|||
|
|
/* #ifndef APP-NVUE */
|
|||
|
|
display: inline-block;
|
|||
|
|
/* #endif */
|
|||
|
|
text-align: center;
|
|||
|
|
transition-property: background-color, color;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.tab-bar {
|
|||
|
|
position: absolute;
|
|||
|
|
bottom: 6rpx;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.tabs-scorll-flex {
|
|||
|
|
display: flex;
|
|||
|
|
justify-content: space-between;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// .tab-content {
|
|||
|
|
// overflow: hidden;
|
|||
|
|
// .tab-track {
|
|||
|
|
// position: relative;
|
|||
|
|
// width: 100%;
|
|||
|
|
// height: 100%;
|
|||
|
|
// }
|
|||
|
|
// .tab-animated {
|
|||
|
|
// display: flex;
|
|||
|
|
// transition-property: left;
|
|||
|
|
// }
|
|||
|
|
// }
|
|||
|
|
</style>
|