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297 lines
9.5 KiB
297 lines
9.5 KiB
3 years ago
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<template>
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<view
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class="u-rate"
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:id="elId"
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ref="u-rate"
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:style="[$u.addStyle(customStyle)]"
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>
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<view
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class="u-rate__content"
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@touchmove.stop="touchMove"
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@touchend.stop="touchEnd"
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>
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<view
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class="u-rate__content__item"
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v-for="(item, index) in Number(count)"
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:key="index"
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:class="[elClass]"
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>
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<view
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class="u-rate__content__item__icon-wrap"
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ref="u-rate__content__item__icon-wrap"
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@tap.stop="clickHandler($event, index + 1)"
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>
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<u-icon
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:name="
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Math.floor(activeIndex) > index
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? activeIcon
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: inactiveIcon
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"
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:color="
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disabled
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? '#c8c9cc'
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: Math.floor(activeIndex) > index
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? activeColor
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: inactiveColor
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"
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:custom-style="{
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padding: `0 ${$u.addUnit(gutter / 2)}`,
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}"
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:size="size"
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></u-icon>
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</view>
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<view
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v-if="allowHalf"
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@tap.stop="clickHandler($event, index + 1)"
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class="u-rate__content__item__icon-wrap u-rate__content__item__icon-wrap--half"
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:style="[{
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width: $u.addUnit(rateWidth / 2),
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}]"
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ref="u-rate__content__item__icon-wrap"
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>
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<u-icon
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:name="
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Math.ceil(activeIndex) > index
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? activeIcon
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: inactiveIcon
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"
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:color="
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disabled
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? '#c8c9cc'
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: Math.ceil(activeIndex) > index
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? activeColor
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: inactiveColor
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"
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:custom-style="{
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padding: `0 ${$u.addUnit(gutter / 2)}`
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}"
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:size="size"
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></u-icon>
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</view>
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</view>
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</view>
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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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// #ifdef APP-NVUE
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const dom = weex.requireModule("dom");
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// #endif
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/**
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* rate 评分
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* @description 该组件一般用于满意度调查，星型评分的场景
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* @tutorial https://www.uviewui.com/components/rate.html
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* @property {String | Number} value 用于v-model双向绑定选中的星星数量 (默认 1 )
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* @property {String | Number} count 最多可选的星星数量 （默认 5 ）
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* @property {Boolean} disabled 是否禁止用户操作 （默认 false ）
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* @property {String | Number} size 星星的大小，单位px （默认 18 ）
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* @property {String} inactiveColor 未选中星星的颜色 （默认 '#b2b2b2' ）
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* @property {String} activeColor 选中的星星颜色 （默认 '#FA3534' ）
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* @property {String | Number} gutter 星星之间的距离 （默认 4 ）
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* @property {String | Number} minCount 最少选中星星的个数 （默认 1 ）
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* @property {Boolean} allowHalf 是否允许半星选择 （默认 false ）
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* @property {String} activeIcon 选中时的图标名，只能为uView的内置图标 （默认 'star-fill' ）
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* @property {String} inactiveIcon 未选中时的图标名，只能为uView的内置图标 （默认 'star' ）
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* @property {Boolean} touchable 是否可以通过滑动手势选择评分 （默认 'true' ）
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* @property {Object} customStyle 组件的样式，对象形式
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* @event {Function} change 选中的星星发生变化时触发
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* @example <u-rate :count="count" :value="2"></u-rate>
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*/
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export default {
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name: "u-rate",
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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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// 生成一个唯一id，否则一个页面多个评分组件，会造成冲突
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elId: uni.$u.guid(),
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elClass: uni.$u.guid(),
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rateBoxLeft: 0, // 评分盒子左边到屏幕左边的距离，用于滑动选择时计算距离
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activeIndex: this.value,
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rateWidth: 0, // 每个星星的宽度
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// 标识是否正在滑动，由于iOS事件上touch比click先触发，导致快速滑动结束后，接着触发click，导致事件混乱而出错
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moving: false,
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};
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},
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watch: {
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value(val) {
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this.activeIndex = val;
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},
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},
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methods: {
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init() {
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uni.$u.sleep().then(() => {
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this.getRateItemRect();
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this.getRateIconWrapRect();
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})
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},
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// 获取评分组件盒子的布局信息
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async getRateItemRect() {
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await uni.$u.sleep();
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// uView封装的获取节点的方法，详见文档
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// #ifndef APP-NVUE
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this.$uGetRect("#" + this.elId).then((res) => {
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this.rateBoxLeft = res.left;
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});
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// #endif
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// #ifdef APP-NVUE
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dom.getComponentRect(this.$refs["u-rate"], (res) => {
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this.rateBoxLeft = res.size.left;
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});
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// #endif
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},
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// 获取单个星星的尺寸
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getRateIconWrapRect() {
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// uView封装的获取节点的方法，详见文档
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// #ifndef APP-NVUE
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this.$uGetRect("." + this.elClass).then((res) => {
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this.rateWidth = res.width;
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});
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// #endif
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// #ifdef APP-NVUE
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dom.getComponentRect(
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this.$refs["u-rate__content__item__icon-wrap"][0],
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(res) => {
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this.rateWidth = res.size.width;
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}
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);
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// #endif
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},
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// 手指滑动
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touchMove(e) {
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// 如果禁止通过手动滑动选择，返回
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if (!this.touchable) {
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return;
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}
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this.preventEvent(e);
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const x = e.changedTouches[0].pageX;
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this.getActiveIndex(x);
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},
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// 停止滑动
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touchEnd(e) {
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// 如果禁止通过手动滑动选择，返回
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if (!this.touchable) {
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return;
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}
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this.preventEvent(e);
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const x = e.changedTouches[0].pageX;
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this.getActiveIndex(x);
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},
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// 通过点击，直接选中
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clickHandler(e, index) {
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// ios上，moving状态取消事件触发
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if (uni.$u.os() === "ios" && this.moving) {
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return;
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}
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this.preventEvent(e);
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let x = 0;
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// 点击时，在nvue上，无法获得点击的坐标，所以无法实现点击半星选择
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// #ifndef APP-NVUE
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x = e.changedTouches[0].pageX;
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// #endif
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// #ifdef APP-NVUE
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// nvue下，无法通过点击获得坐标信息，这里通过元素的位置尺寸值模拟坐标
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x = index * this.rateWidth + this.rateBoxLeft;
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// #endif
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this.getActiveIndex(x);
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},
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// 发出事件
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emitEvent() {
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// 发出change事件
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this.$emit("change", this.activeIndex);
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// 同时修改双向绑定的value的值
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this.$emit("input", this.activeIndex);
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},
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// 获取当前激活的评分图标
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getActiveIndex(x) {
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if (this.disabled) {
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return;
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}
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// 判断当前操作的点的x坐标值，是否在允许的边界范围内
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const allRateWidth = this.rateWidth * this.count + this.rateBoxLeft;
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// 如果小于第一个图标的左边界，设置为最小值，如果大于所有图标的宽度，则设置为最大值
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x = uni.$u.range(this.rateBoxLeft, allRateWidth, x);
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// 滑动点相对于评分盒子左边的距离
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const distance = x;
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// 滑动的距离，相当于多少颗星星
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let index;
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// 判断是否允许半星
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if (this.allowHalf) {
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index = Math.floor(distance / this.rateWidth);
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// 取余，判断小数的区间范围
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const decimal = distance % this.rateWidth;
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if (decimal <= this.rateWidth / 2 && decimal > 0) {
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index += 0.5;
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} else if (decimal > this.rateWidth / 2) {
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index++;
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}
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} else {
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index = Math.floor(distance / this.rateWidth);
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// 取余，判断小数的区间范围
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const decimal = distance % this.rateWidth;
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// 非半星时，只有超过了图标的一半距离，才认为是选择了这颗星
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if (decimal > this.rateWidth / 2) {
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index++;
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}
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}
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this.activeIndex = Math.min(index, this.count);
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// 对最少颗星星的限制
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if (this.activeIndex < this.minCount) {
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this.activeIndex = this.minCount;
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}
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this.moving = true;
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// 一定时间后，取消标识为移动中状态，是为了让click事件无效
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setTimeout(() => {
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this.moving = false;
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}, 10);
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this.emitEvent();
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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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};
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</script>
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<style lang="scss">
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@import "../../libs/css/components.scss";
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$u-rate-margin: 0 !default;
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$u-rate-padding: 0 !default;
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$u-rate-item-icon-wrap-half-top: 0 !default;
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$u-rate-item-icon-wrap-half-left: 0 !default;
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.u-rate {
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@include flex;
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align-items: center;
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margin: $u-rate-margin;
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padding: $u-rate-padding;
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/* #ifndef APP-NVUE */
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touch-action: none;
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/* #endif */
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&__content {
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@include flex;
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&__item {
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position: relative;
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&__icon-wrap {
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&--half {
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position: absolute;
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overflow: hidden;
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top: $u-rate-item-icon-wrap-half-top;
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left: $u-rate-item-icon-wrap-half-left;
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}
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}
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}
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}
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}
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.u-icon {
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/* #ifndef APP-NVUE */
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box-sizing: border-box;
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/* #endif */
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}
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</style>
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