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<template>
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<view
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class="u-subsection"
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ref="u-subsection"
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:class="[`u-subsection--${mode}`]"
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:style="[$u.addStyle(customStyle), wrapperStyle]"
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>
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<view
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class="u-subsection__bar"
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ref="u-subsection__bar"
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:style="[barStyle]"
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:class="[
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mode === 'button' && 'u-subsection--button__bar',
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current === 0 &&
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mode === 'subsection' &&
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'u-subsection__bar--first',
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current > 0 &&
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current < list.length - 1 &&
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mode === 'subsection' &&
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'u-subsection__bar--center',
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current === list.length - 1 &&
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mode === 'subsection' &&
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'u-subsection__bar--last',
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]"
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></view>
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<view
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class="u-subsection__item"
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:class="[
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`u-subsection__item--${index}`,
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index < list.length - 1 &&
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'u-subsection__item--no-border-right',
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index === 0 && 'u-subsection__item--first',
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index === list.length - 1 && 'u-subsection__item--last',
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]"
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:ref="`u-subsection__item--${index}`"
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:style="[itemStyle(index)]"
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@tap="clickHandler(index)"
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v-for="(item, index) in list"
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:key="index"
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>
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<text
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class="u-subsection__item__text"
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:style="[textStyle(index)]"
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>{{ getText(item) }}</text
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>
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</view>
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</view>
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</template>
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<script>
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// #ifdef APP-NVUE
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const dom = uni.requireNativePlugin("dom");
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const animation = uni.requireNativePlugin("animation");
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// #endif
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import props from "./props.js";
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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 tab的数据
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* @property {String ｜ Number} current 当前活动的tab的index（默认 0 ）
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* @property {String} activeColor 激活时的颜色（默认 '#3c9cff' ）
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* @property {String} inactiveColor 未激活时的颜色（默认 '#303133' ）
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* @property {String} mode 模式选择，mode=button为按钮形式，mode=subsection时为分段模式（默认 'button' ）
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* @property {String ｜ Number} fontSize 字体大小，单位px（默认 12 ）
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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} bgColor 组件背景颜色，mode为button时有效（默认 '#eeeeef' ）
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* @property {Object} customStyle 定义需要用到的外部样式
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* @property {String} keyName 从`list`元素对象中读取的键名（默认 'name' ）
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*
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* @event {Function} change 分段器选项发生改变时触发 回调 index：选项的index索引值，从0开始
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* @example <u-subsection :list="list" :current="curNow" @change="sectionChange"></u-subsection>
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*/
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export default {
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name: "u-subsection",
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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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// 组件尺寸
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itemRect: {
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width: 0,
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height: 0,
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},
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};
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},
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watch: {
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list(newValue, oldValue) {
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this.init();
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},
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current: {
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immediate: true,
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handler(n) {
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// #ifdef APP-NVUE
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// 在安卓nvue上，如果通过translateX进行位移，到最后一个时，会导致右侧无法绘制圆角
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// 故用animation模块进行位移
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const ref = this.$refs?.["u-subsection__bar"]?.ref;
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// 不存在ref的时候(理解为第一次初始化时，需要渲染dom，进行一定延时再获取ref)，这里的100ms是经过测试得出的结果(某些安卓需要延时久一点)，勿随意修改
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uni.$u.sleep(ref ? 0 : 100).then(() => {
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animation.transition(this.$refs["u-subsection__bar"].ref, {
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styles: {
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transform: `translateX(${
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n * this.itemRect.width
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}px)`,
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transformOrigin: "center center",
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},
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duration: 300,
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});
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});
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// #endif
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},
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},
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},
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computed: {
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wrapperStyle() {
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const style = {};
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// button模式时，设置背景色
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if (this.mode === "button") {
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style.backgroundColor = this.bgColor;
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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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barStyle() {
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const style = {};
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style.width = `${this.itemRect.width}px`;
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style.height = `${this.itemRect.height}px`;
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// 通过translateX移动滑块，其移动的距离为索引*item的宽度
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// #ifndef APP-NVUE
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style.transform = `translateX(${
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this.current * this.itemRect.width
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}px)`;
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// #endif
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if (this.mode === "subsection") {
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// 在subsection模式下，需要动态设置滑块的圆角，因为移动滑块使用的是translateX，无法通过父元素设置overflow: hidden隐藏滑块的直角
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style.backgroundColor = this.activeColor;
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}
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return style;
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},
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// 分段器item的样式
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itemStyle(index) {
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return (index) => {
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const 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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// 分段器文字颜色
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textStyle(index) {
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return (index) => {
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const style = {};
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style.fontWeight =
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this.bold && this.current === index ? "bold" : "normal";
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style.fontSize = uni.$u.addUnit(this.fontSize);
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// subsection模式下，激活时默认为白色的文字
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if (this.mode === "subsection") {
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style.color =
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this.current === index ? "#fff" : this.inactiveColor;
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} else {
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// button模式下，激活时文字颜色默认为activeColor
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style.color =
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this.current === index
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? this.activeColor
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: this.inactiveColor;
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}
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return style;
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};
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},
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},
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mounted() {
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this.init();
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},
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methods: {
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init() {
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uni.$u.sleep().then(() => this.getRect());
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},
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// 判断展示文本
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getText(item) {
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return typeof item === 'object' ? item[this.keyName] : item
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},
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// 获取组件的尺寸
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getRect() {
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// #ifndef APP-NVUE
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this.$uGetRect(".u-subsection__item--0").then((size) => {
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this.itemRect = size;
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});
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// #endif
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// #ifdef APP-NVUE
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const ref = this.$refs["u-subsection__item--0"][0];
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ref &&
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dom.getComponentRect(ref, (res) => {
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this.itemRect = res.size;
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});
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// #endif
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},
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clickHandler(index) {
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this.$emit("change", index);
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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-subsection {
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@include flex;
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position: relative;
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overflow: hidden;
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/* #ifndef APP-NVUE */
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width: 100%;
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box-sizing: border-box;
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/* #endif */
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&--button {
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height: 32px;
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background-color: rgb(238, 238, 239);
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padding: 3px;
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border-radius: 3px;
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align-items: stretch;
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&__bar {
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background-color: #ffffff;
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border-radius: 3px !important;
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}
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}
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&--subsection {
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height: 30px;
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}
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&__bar {
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position: absolute;
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/* #ifndef APP-NVUE */
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transition-property: transform, color;
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transition-duration: 0.3s;
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transition-timing-function: ease-in-out;
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/* #endif */
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&--first {
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border-top-left-radius: 3px;
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border-bottom-left-radius: 3px;
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border-top-right-radius: 0px;
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border-bottom-right-radius: 0px;
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}
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&--center {
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border-top-left-radius: 0px;
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border-bottom-left-radius: 0px;
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border-top-right-radius: 0px;
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border-bottom-right-radius: 0px;
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}
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&--last {
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border-top-left-radius: 0px;
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border-bottom-left-radius: 0px;
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border-top-right-radius: 3px;
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border-bottom-right-radius: 3px;
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}
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}
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&__item {
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@include flex;
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flex: 1;
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justify-content: center;
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align-items: center;
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// vue环境下，需要设置相对定位，因为滑块为绝对定位，item需要在滑块的上面
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position: relative;
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&--no-border-right {
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border-right-width: 0 !important;
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}
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&--first {
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border-top-left-radius: 3px;
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border-bottom-left-radius: 3px;
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}
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&--last {
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border-top-right-radius: 3px;
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border-bottom-right-radius: 3px;
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}
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&__text {
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font-size: 12px;
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line-height: 12px;
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@include flex;
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align-items: center;
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transition-property: color;
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transition-duration: 0.3s;
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}
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}
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}
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</style>
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