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143 lines
3.9 KiB
143 lines
3.9 KiB
3 years ago
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<template>
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<view
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class="u-tabbar-item"
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:style="[$u.addStyle(customStyle)]"
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@tap="clickHandler"
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>
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<view class="u-tabbar-item__icon">
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<u-icon
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v-if="icon"
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:name="icon"
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:color="isActive? parentData.activeColor : parentData.inactiveColor"
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:size="20"
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></u-icon>
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<template v-else>
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<slot
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v-if="isActive"
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name="active-icon"
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/>
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<slot
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v-else
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name="inactive-icon"
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/>
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</template>
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<u-badge
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absolute
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:offset="[0, dot ? '34rpx' : badge > 9 ? '14rpx' : '20rpx']"
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:customStyle="badgeStyle"
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:isDot="dot"
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:value="badge || (dot ? 1 : null)"
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:show="dot || badge > 0"
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></u-badge>
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</view>
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<slot name="text">
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<text
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class="u-tabbar-item__text"
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:style="{
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color: isActive? parentData.activeColor : parentData.inactiveColor
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}"
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>{{ text }}</text>
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</slot>
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</view>
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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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* TabbarItem 底部导航栏子组件
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* @description 此组件提供了自定义tabbar的能力。
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* @tutorial https://www.uviewui.com/components/tabbar.html
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* @property {String | Number} name item标签的名称，作为与u-tabbar的value参数匹配的标识符
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* @property {String} icon uView内置图标或者绝对路径的图片
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* @property {String | Number} badge 右上角的角标提示信息
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* @property {Boolean} dot 是否显示圆点，将会覆盖badge参数（默认 false ）
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* @property {String} text 描述文本
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* @property {Object | String} badgeStyle 控制徽标的位置，对象或者字符串形式，可以设置top和right属性（默认 'top: 6px;right:2px;' ）
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* @property {Object} customStyle 定义需要用到的外部样式
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*
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* @example <u-tabbar :value="value2" :placeholder="false" @change="name => value2 = name" :fixed="false" :safeAreaInsetBottom="false"><u-tabbar-item text="首页" icon="home" dot ></u-tabbar-item></u-tabbar>
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*/
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export default {
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name: 'u-tabbar-item',
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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data() {
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return {
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isActive: false, // 是否处于激活状态
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parentData: {
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value: null,
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activeColor: '',
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inactiveColor: ''
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}
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}
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},
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created() {
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this.init()
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},
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methods: {
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init() {
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// 支付宝小程序不支持provide/inject，所以使用这个方法获取整个父组件，在created定义，避免循环引用
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this.updateParentData()
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if (!this.parent) {
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uni.$u.error('u-tabbar-item必须搭配u-tabbar组件使用')
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}
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// 本子组件在u-tabbar的children数组中的索引
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const index = this.parent.children.indexOf(this)
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// 判断本组件的name(如果没有定义name，就用index索引)是否等于父组件的value参数
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this.isActive = (this.name || index) === this.parentData.value
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},
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updateParentData() {
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// 此方法在mixin中
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this.getParentData('u-tabbar')
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},
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// 此方法将会被父组件u-tabbar调用
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updateFromParent() {
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// 重新初始化
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this.init()
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},
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clickHandler() {
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this.$nextTick(() => {
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const index = this.parent.children.indexOf(this)
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const name = this.name || index
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// 点击的item为非激活的item才发出change事件
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if (name !== this.parent.value) {
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this.parent.$emit('change', name)
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}
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this.$emit('click', name)
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})
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}
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},
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}
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</script>
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<style lang="scss">
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@import "../../libs/css/components.scss";
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.u-tabbar-item {
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@include flex(column);
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align-items: center;
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justify-content: center;
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flex: 1;
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&__icon {
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@include flex;
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position: relative;
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width: 150rpx;
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justify-content: center;
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}
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&__text {
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margin-top: 2px;
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font-size: 12px;
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color: $u-content-color;
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}
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}
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/* #ifdef MP */
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// 由于小程序都使用shadow DOM形式实现，需要给影子宿主设置flex: 1才能让其撑开
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:host {
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flex: 1
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}
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/* #endif */
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</style>
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