-
zhangwei
2025-03-05 16213c0f85aa3ac8317797bf4a05fd12940e16d3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
<template>
    <view
        class="u-tabbar-item"
        :style="[addStyle(customStyle)]"
        @tap="clickHandler"
    >
        <view class="u-tabbar-item__icon">
            <u-icon
                v-if="icon"
                :name="icon"
                :color="isActive? parentData.activeColor : parentData.inactiveColor"
                :size="20"
            ></u-icon>
            <template v-else>
                <slot
                    v-if="isActive"
                    name="active-icon"
                />
                <slot
                    v-else
                    name="inactive-icon"
                />
            </template>
            <u-badge
                absolute
                :offset="[0, dot ? '34rpx' : badge > 9 ? '14rpx' : '20rpx']"
                :customStyle="badgeStyle"
                :isDot="dot"
                :value="badge || (dot ? 1 : null)"
                :show="dot || badge > 0"
            ></u-badge>
        </view>
        
        <slot name="text">
            <text
                class="u-tabbar-item__text"
                :style="{
                    color: isActive? parentData.activeColor : parentData.inactiveColor
                }"
            >{{ text }}</text>
        </slot>
    </view>
</template>
 
<script>
    import { props } from './props';
    import { mpMixin } from '../../libs/mixin/mpMixin';
    import { mixin } from '../../libs/mixin/mixin';
    import { addStyle, error } from '../../libs/function/index';
    /**
     * TabbarItem 底部导航栏子组件
     * @description 此组件提供了自定义tabbar的能力。
     * @tutorial https://ijry.github.io/uview-plus/components/tabbar.html
     * @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
     * @property {String}            icon        uView内置图标或者绝对路径的图片
     * @property {String | Number}    badge        右上角的角标提示信息
     * @property {Boolean}            dot            是否显示圆点,将会覆盖badge参数(默认 false )
     * @property {String}            text        描述文本
     * @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;' )
     * @property {Object}            customStyle    定义需要用到的外部样式
     * 
     * @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>
     */
    export default {
        name: 'u-tabbar-item',
        mixins: [mpMixin, mixin, props],
        data() {
            return {
                isActive: false, // 是否处于激活状态
                parentData: {
                    value: null,
                    activeColor: '',
                    inactiveColor: ''
                }
            }
        },
        //  微信小程序中 options 选项
        options: {
            virtualHost: true //将自定义节点设置成虚拟的,更加接近Vue组件的表现。我们不希望自定义组件的这个节点本身可以设置样式、响应 flex 布局等
        },
        created() {
            this.init()
        },
        emits: ["click", "change"],
        methods: {
            addStyle,
            init() {
                // 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
                this.updateParentData()
                if (!this.parent) {
                    error('u-tabbar-item必须搭配u-tabbar组件使用')
                }
                // 本子组件在u-tabbar的children数组中的索引
                const index = this.parent.children.indexOf(this)
                // 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
                this.isActive = (this.name || index) === this.parentData.value
            },
            updateParentData() {
                // 此方法在mixin中
                this.getParentData('u-tabbar')
            },
            // 此方法将会被父组件u-tabbar调用
            updateFromParent() {
                // 重新初始化
                this.init()
            },
            clickHandler() {
                this.$nextTick(() => {
                    const index = this.parent.children.indexOf(this)
                    const name = this.name || index
                    // 点击的item为非激活的item才发出change事件
                    if (name !== this.parent.value) {
                        this.parent.$emit('change', name)
                    }
                    this.$emit('click', name)
                })
            }
        },
    }
</script>
 
<style lang="scss" scoped>
    @import "../../libs/css/components.scss";
    .u-tabbar-item {
        @include flex(column);
        align-items: center;
        justify-content: center;
        flex: 1;
        /* #ifndef APP-NVUE */
        width: 100%;
        height: 100%;
        /* #endif */
        /* #ifdef H5 */
        cursor: pointer;
        /* #endif */
        
        &__icon {
            @include flex;
            position: relative;
            width: 150rpx;
            justify-content: center;
        }
 
        &__text {
            margin-top: 2px;
            font-size: 12px;
            color: $u-content-color;
        }
    }
 
    /* #ifdef MP */
    // 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
    :host {
        flex: 1;
        width: 100%;
    }
    /* #endif */
</style>