<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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