210 lines
6.2 KiB
Vue
210 lines
6.2 KiB
Vue
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<template>
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<!-- #ifndef APP-NVUE -->
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<view
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class="u-grid-item"
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hover-class="u-grid-item--hover-class"
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:hover-stay-time="200"
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@tap="clickHandler"
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:class="classes"
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:style="[itemStyle]"
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>
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<slot />
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</view>
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<!-- #endif -->
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<!-- #ifdef APP-NVUE -->
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<view
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class="u-grid-item"
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:hover-stay-time="200"
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@tap="clickHandler"
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:class="classes"
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:style="[itemStyle]"
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>
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<slot />
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</view>
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<!-- #endif -->
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</template>
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<script>
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import props from './props.js';
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/**
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* gridItem 提示
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* @description 宫格组件一般用于同时展示多个同类项目的场景，可以给宫格的项目设置徽标组件(badge)，或者图标等，也可以扩展为左右滑动的轮播形式。搭配u-grid使用
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* @tutorial https://www.uviewui.com/components/grid.html
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* @property {String | Number} name 宫格的name ( 默认 null )
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* @property {String} bgColor 宫格的背景颜色 （默认 'transparent' ）
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* @property {Object} customStyle 自定义样式，对象形式
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* @event {Function} click 点击宫格触发
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* @example <u-grid-item></u-grid-item>
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*/
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export default {
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name: "u-grid-item",
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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data() {
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return {
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parentData: {
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col: 3, // 父组件划分的宫格数
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border: true, // 是否显示边框，根据父组件决定
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},
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// #ifdef APP-NVUE
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width: 0, // nvue下才这么计算，vue下放到computed中，否则会因为延时造成闪烁
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// #endif
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classes: [], // 类名集合，用于判断是否显示右边和下边框
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};
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},
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mounted() {
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this.init()
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},
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computed: {
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// #ifndef APP-NVUE
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// vue下放到computed中，否则会因为延时造成闪烁
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width() {
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return 100 / Number(this.parentData.col) + '%'
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},
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// #endif
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itemStyle() {
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const style = {
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background: this.bgColor,
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width: this.width
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}
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return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))
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}
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},
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methods: {
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init() {
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// 用于在父组件u-grid的children中被添加入子组件时，
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// 重新计算item的边框
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uni.$on('$uGridItem', () => {
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this.gridItemClasses()
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})
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// 父组件的实例
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this.updateParentData()
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// #ifdef APP-NVUE
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// 获取元素该有的长度，nvue下要延时才准确
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this.$nextTick(function(){
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this.getItemWidth()
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})
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// #endif
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// 发出事件，通知所有的grid-item都重新计算自己的边框
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uni.$emit('$uGridItem')
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this.gridItemClasses()
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},
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// 获取父组件的参数
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updateParentData() {
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// 此方法写在mixin中
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this.getParentData('u-grid');
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},
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clickHandler() {
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let name = this.name
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// 如果没有设置name属性，历遍父组件的children数组，判断当前的元素是否和本实例this相等，找出当前组件的索引
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const children = this.parent?.children
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if(children && this.name === null) {
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name = children.findIndex(child => child === this)
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}
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// 调用父组件方法，发出事件
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this.parent && this.parent.childClick(name)
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this.$emit('click', name)
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},
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async getItemWidth() {
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// 如果是nvue，不能使用百分比，只能使用固定宽度
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let width = 0
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if(this.parent) {
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// 获取父组件宽度后，除以栅格数，得出每个item的宽度
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const parentWidth = await this.getParentWidth()
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width = parentWidth / Number(this.parentData.col) + 'px'
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}
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this.width = width
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},
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// 获取父元素的尺寸
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getParentWidth() {
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// #ifdef APP-NVUE
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// 返回一个promise，让调用者可以用await同步获取
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const dom = uni.requireNativePlugin('dom')
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return new Promise(resolve => {
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// 调用父组件的ref
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dom.getComponentRect(this.parent.$refs['u-grid'], res => {
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resolve(res.size.width)
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})
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})
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// #endif
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},
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gridItemClasses() {
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if(this.parentData.border) {
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const classes = []
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this.parent.children.map((child, index) =>{
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if(this === child) {
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const len = this.parent.children.length
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// 贴近右边屏幕边沿的child，并且最后一个（比如只有横向2个的时候），无需右边框
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if((index + 1) % this.parentData.col !== 0 && index + 1 !== len) {
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classes.push('u-border-right')
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}
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// 总的宫格数量对列数取余的值
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// 如果取余后，值为0，则意味着要将最后一排的宫格，都不需要下边框
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const lessNum = len % this.parentData.col === 0 ? this.parentData.col : len % this.parentData.col
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// 最下面的一排child，无需下边框
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if(index < len - lessNum) {
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classes.push('u-border-bottom')
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}
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}
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})
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// 支付宝，头条小程序无法动态绑定一个数组类名，否则解析出来的结果会带有","，而导致失效
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// #ifdef MP-ALIPAY || MP-TOUTIAO
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classes = classes.join(' ')
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// #endif
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this.classes = classes
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}
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}
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},
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beforeDestroy() {
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// 移除事件监听，释放性能
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uni.$off('$uGridItem')
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}
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};
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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$u-grid-item-hover-class-opcatiy:.5 !default;
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$u-grid-item-margin-top:1rpx !default;
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$u-grid-item-border-right-width:0.5px !default;
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$u-grid-item-border-bottom-width:0.5px !default;
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$u-grid-item-border-right-color:$u-border-color !default;
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$u-grid-item-border-bottom-color:$u-border-color !default;
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.u-grid-item {
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align-items: center;
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justify-content: center;
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position: relative;
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flex-direction: column;
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/* #ifndef APP-NVUE */
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box-sizing: border-box;
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display: flex;
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/* #endif */
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/* #ifdef MP */
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position: relative;
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float: left;
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/* #endif */
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/* #ifdef MP-WEIXIN */
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margin-top:$u-grid-item-margin-top;
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/* #endif */
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&--hover-class {
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opacity:$u-grid-item-hover-class-opcatiy;
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}
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}
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/* #ifdef APP-NVUE */
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// 由于nvue不支持组件内引入app.vue中再引入的样式，所以需要写在这里
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.u-border-right {
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border-right-width:$u-grid-item-border-right-width;
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border-color: $u-grid-item-border-right-color;
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}
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.u-border-bottom {
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border-bottom-width:$u-grid-item-border-bottom-width;
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border-color:$u-grid-item-border-bottom-color;
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}
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/* #endif */
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</style>
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