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142 lines
3.9 KiB
142 lines
3.9 KiB
<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" scoped> |
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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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