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<template>
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<view class="u-subsection" :style="[subsectionStyle]">
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<view class="u-item u-line-1" :style="[itemStyle(index)]" @tap="click(index)" :class="[noBorderRight(index), 'u-item-' + index]"
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v-for="(item, index) in listInfo" :key="index">
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<view :style="[textStyle(index)]" class="u-item-text u-line-1">{{ item.name }}</view>
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</view>
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<view class="u-item-bg" :style="[itemBarStyle]"></view>
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</view>
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</template>
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<script>
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/**
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* subsection 分段器
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* @description 该分段器一般用于用户从几个选项中选择某一个的场景
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* @tutorial https://www.uviewui.com/components/subsection.html
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* @property {Array} list 选项的数组，形式见上方"基本使用"
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* @property {String Number} current 初始化时默认选中的选项索引值（默认0）
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* @property {String} active-color 激活时的颜色，mode为subsection时固定为白色（默认#303133）
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* @property {String} inactive-color 未激活时字体的颜色，mode为subsection时无效（默认#606266）
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* @property {String} mode 模式选择，见官网"模式选择"说明（默认button）
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* @property {String Number} font-size 字体大小，单位rpx（默认28）
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* @property {String Number} height 组件高度，单位rpx（默认70）
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* @property {Boolean} animation 是否开启动画效果，见上方说明（默认true）
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* @property {Boolean} bold 激活选项的字体是否加粗（默认true）
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* @property {String} bg-color 组件背景颜色，mode为button时有效（默认#eeeeef）
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* @property {String} button-color 按钮背景颜色，mode为button时有效（默认#ffffff）
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* @event {Function} change 分段器选项发生改变时触发
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* @example <u-subsection active-color="#ff9900"></u-subsection>
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*/
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export default {
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name: "u-subsection",
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props: {
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// tab的数据
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list: {
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type: Array,
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default () {
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return [];
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}
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},
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// 当前活动的tab的index
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current: {
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type: [Number, String],
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default: 0
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},
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// 激活的颜色
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activeColor: {
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type: String,
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default: '#303133'
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},
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// 未激活的颜色
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inactiveColor: {
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type: String,
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default: '#606266'
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},
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// 模式选择，mode=button为按钮形式，mode=subsection时为分段模式
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mode: {
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type: String,
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default: 'button'
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},
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// 字体大小，单位rpx
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fontSize: {
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type: [Number, String],
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default: 28
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},
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// 是否开启动画效果
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animation: {
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type: Boolean,
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default: true
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},
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// 组件的高度，单位rpx
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height: {
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type: [Number, String],
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default: 70
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},
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// 激活tab的字体是否加粗
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bold: {
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type: Boolean,
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default: true
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},
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// mode=button时，组件背景颜色
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bgColor: {
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type: String,
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default: '#eeeeef'
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},
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// mode = button时，滑块背景颜色
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buttonColor: {
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type: String,
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default: '#ffffff'
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},
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// 在切换分段器的时候，是否让设备震一下
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vibrateShort: {
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type: Boolean,
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default: false
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}
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},
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data() {
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return {
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listInfo: [],
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itemBgStyle: {
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width: 0,
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left: 0,
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backgroundColor: '#ffffff',
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height: '100%',
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transition: ''
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},
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currentIndex: this.current,
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buttonPadding: 3, // mode = button 时，组件的内边距
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borderRadius: 5, // 圆角值
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firstTimeVibrateShort: true // 组件初始化时，会触发current变化，此时不应震动
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};
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},
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watch: {
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current: {
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immediate: true,
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handler(nVal) {
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this.currentIndex = nVal;
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this.changeSectionStatus(nVal);
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}
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}
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},
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created() {
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// 将list的数据，传入listInfo数组，因为不能修改props传递的list值
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// 可以接受直接数组形式，或者数组元素为对象的形式，如：['简介', '评论'],或者[{name: '简介'}, {name: '评论'}]
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this.listInfo = this.list.map((val, index) => {
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if (typeof val != 'object') {
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let obj = {
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width: 0,
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name: val
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};
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return obj;
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} else {
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val.width = 0;
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return val;
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}
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});
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},
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computed: {
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// 设置mode=subsection时，滑块特有的样式
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noBorderRight() {
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return index => {
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if (this.mode != 'subsection') return;
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let classs = '';
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// 不显示右边的边框
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if (index < this.list.length - 1) classs += ' u-none-border-right';
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// 显示整个组件的左右边圆角
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if (index == 0) classs += ' u-item-first';
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if (index == this.list.length - 1) classs += ' u-item-last';
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return classs;
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};
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},
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// 文字的样式
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textStyle() {
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return index => {
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let style = {};
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// 设置字体颜色
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if (this.mode == 'subsection') {
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if (index == this.currentIndex) {
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style.color = '#ffffff';
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} else {
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style.color = this.activeColor;
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}
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} else {
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if (index == this.currentIndex) {
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style.color = this.activeColor;
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} else {
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style.color = this.inactiveColor;
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}
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}
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// 字体加粗
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if (index == this.currentIndex && this.bold) style.fontWeight = 'bold';
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// 文字大小
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style.fontSize = this.fontSize + 'rpx';
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return style;
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};
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},
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// 每个分段器item的样式
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itemStyle() {
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return index => {
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let style = {};
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if (this.mode == 'subsection') {
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// 设置border的样式
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style.borderColor = this.activeColor;
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style.borderWidth = '1px';
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style.borderStyle = 'solid';
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}
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return style;
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};
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},
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// mode=button时，外层view的样式
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subsectionStyle() {
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let style = {};
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style.height = uni.upx2px(this.height) + 'px';
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if (this.mode == 'button') {
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style.backgroundColor = this.bgColor;
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style.padding = `${this.buttonPadding}px`;
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style.borderRadius = `${this.borderRadius}px`;
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}
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return style;
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},
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// 滑块的样式
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itemBarStyle() {
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let style = {};
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style.backgroundColor = this.activeColor;
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style.zIndex = 1;
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if (this.mode == 'button') {
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style.backgroundColor = this.buttonColor;
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style.borderRadius = `${this.borderRadius}px`;
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style.bottom = `${this.buttonPadding}px`;
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style.height = uni.upx2px(this.height) - this.buttonPadding * 2 + 'px';
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style.zIndex = 0;
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}
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return Object.assign(this.itemBgStyle, style);
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}
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},
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mounted() {
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setTimeout(() => {
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this.getTabsInfo();
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}, 10);
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},
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methods: {
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// 改变滑块的样式
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changeSectionStatus(nVal) {
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if (this.mode == 'subsection') {
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// 根据滑块在最左边和最右边时，显示左边和右边的圆角
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if (nVal == this.list.length - 1) {
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this.itemBgStyle.borderRadius = `0 ${this.buttonPadding}px ${this.buttonPadding}px 0`;
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}
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if (nVal == 0) {
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this.itemBgStyle.borderRadius = `${this.buttonPadding}px 0 0 ${this.buttonPadding}px`;
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}
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if (nVal > 0 && nVal < this.list.length - 1) {
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this.itemBgStyle.borderRadius = '0';
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}
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}
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// 更新滑块的位置
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setTimeout(() => {
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this.itemBgLeft();
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}, 10);
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if (this.vibrateShort && !this.firstTimeVibrateShort) {
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// 使手机产生短促震动，微信小程序有效，APP(HX 2.6.8)和H5无效
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// #ifndef H5
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uni.vibrateShort();
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// #endif
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}
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// 第一次过后，设置firstTimeVibrateShort为false，让其下一次可以震动(如果允许震动的话)
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this.firstTimeVibrateShort = false;
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},
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click(index) {
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// 不允许点击当前激活选项
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if (index == this.currentIndex) return;
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this.currentIndex = index;
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this.changeSectionStatus(index);
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this.$emit('change', Number(index));
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},
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// 获取各个tab的节点信息
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getTabsInfo() {
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let view = uni.createSelectorQuery().in(this);
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for (let i = 0; i < this.list.length; i++) {
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view.select('.u-item-' + i).boundingClientRect();
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}
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view.exec(res => {
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if (!res.length) {
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setTimeout(() => {
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this.getTabsInfo();
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return;
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}, 10);
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}
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// 将分段器每个item的宽度，放入listInfo数组
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res.map((val, index) => {
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this.listInfo[index].width = val.width;
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});
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// 初始化滑块的宽度
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if (this.mode == 'subsection') {
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this.itemBgStyle.width = this.listInfo[0].width + 'px';
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} else if (this.mode == 'button') {
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this.itemBgStyle.width = this.listInfo[0].width + 'px';
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}
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// 初始化滑块的位置
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this.itemBgLeft();
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});
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},
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itemBgLeft() {
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// 根据是否开启动画效果，
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if (this.animation) {
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this.itemBgStyle.transition = 'all 0.35s';
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} else {
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this.itemBgStyle.transition = 'all 0s';
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}
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let left = 0;
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// 计算当前活跃item到组件左边的距离
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this.listInfo.map((val, index) => {
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if (index < this.currentIndex) left += val.width;
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});
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// 根据mode不同模式，计算滑块需要移动的距离
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if (this.mode == 'subsection') {
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this.itemBgStyle.left = left + 'px';
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} else if (this.mode == 'button') {
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this.itemBgStyle.left = left + this.buttonPadding + 'px';
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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/style.components.scss";
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.u-subsection {
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@include vue-flex;
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align-items: center;
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overflow: hidden;
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position: relative;
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}
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.u-item {
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flex: 1;
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text-align: center;
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font-size: 26rpx;
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height: 100%;
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@include vue-flex;
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align-items: center;
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justify-content: center;
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color: $u-main-color;
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padding: 0 6rpx;
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}
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.u-item-bg {
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background-color: $u-type-primary;
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position: absolute;
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z-index: -1;
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}
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.u-none-border-right {
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border-right: none !important;
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}
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.u-item-first {
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border-top-left-radius: 8rpx;
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border-bottom-left-radius: 8rpx;
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}
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.u-item-last {
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border-top-right-radius: 8rpx;
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border-bottom-right-radius: 8rpx;
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}
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.u-item-text {
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transition: all 0.35s;
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color: $u-main-color;
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@include vue-flex;
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align-items: center;
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position: relative;
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z-index: 3;
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}
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</style>
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