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<template>
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<view class="u-rate" :id="elId" ref="u-rate">
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<view class="u-rate__content" @touchmove.stop="touchMove">
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<view class="u-rate__content__item" v-for="(item, index) in count" :key="index" :class="[elClass]">
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<view class="u-rate__content__item__icon-wrap" ref="u-rate__content__item__icon-wrap"
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@tap.stop="clickHandler(index + 1, $event)">
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<u-icon :name="Math.floor(activeIndex) > index? activeIcon: inactiveIcon"
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:color="disabled? '#c8c9cc': Math.floor(activeIndex) > index? activeColor: inactiveColor"
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:custom-style="{padding:`0 ${gutter / 2 + 'rpx'}`}" :size="size"></u-icon>
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</view>
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<view v-if="allowHalf" @tap.stop="clickHandler(index + 1, $event)"
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class="u-rate__content__item__icon-wrap u-rate__content__item__icon-wrap--half"
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:style="[{width: starWidth / 2 + 'px',}]" ref="u-rate__content__item__icon-wrap">
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<u-icon :name="Math.ceil(activeIndex) > index? activeIcon: inactiveIcon"
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:color="disabled? '#c8c9cc': Math.ceil(activeIndex) > index? activeColor: inactiveColor"
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:custom-style="{padding: `0 ${gutter / 2 + 'rpx'}`}" :size="size"></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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/**
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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} count 最多可选的星星数量(默认5)
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* @property {String Number} current 默认选中的星星数量(默认0)
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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rpx(默认32)
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* @property {String} inactive-color 未选中星星的颜色(默认#b2b2b2)
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* @property {String} active-color 选中的星星颜色(默认#FA3534)
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* @property {String} active-icon 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} inactive-icon 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 {String} gutter 星星之间的距离(默认10)
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* @property {String Number} min-count 最少选中星星的个数(默认0)
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* @property {Boolean} allow-half 是否允许半星选择(默认false)
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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" :current="2"></u-rate>
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*/
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export default {
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name: 'u-rate',
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props: {
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// 用于v-model双向绑定选中的星星数量
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// 1.4.5版新增
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value: {
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type: [Number, String],
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default: -1
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},
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// 要显示的星星数量
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count: {
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type: [Number, String],
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default: 5
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},
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// 当前需要默认选中的星星(选中的个数)
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// 1.4.5后通过value双向绑定,不再建议使用此参数
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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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// 是否不可选中
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disabled: {
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type: Boolean,
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default: false
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},
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// 星星的大小,单位rpx
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size: {
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type: [Number, String],
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default: 32
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},
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// 未选中时的颜色
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inactiveColor: {
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type: String,
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default: '#b2b2b2'
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},
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// 选中的颜色
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activeColor: {
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type: String,
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default: '#FA3534'
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},
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// 星星之间的间距,单位rpx
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gutter: {
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type: [Number, String],
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default: 10
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},
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// 最少能选择的星星个数
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minCount: {
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type: [Number, String],
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default: 0
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},
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// 是否允许半星(功能尚未实现)
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allowHalf: {
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type: Boolean,
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default: false
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},
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// 选中时的图标(星星)
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activeIcon: {
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type: String,
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default: 'star-fill'
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},
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// 未选中时的图标(星星)
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inactiveIcon: {
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type: String,
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default: 'star'
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},
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// 自定义扩展前缀,方便用户扩展自己的图标库
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customPrefix: {
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type: String,
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default: 'uicon'
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},
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colors: {
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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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icons: {
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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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},
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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: this.$u.guid(),
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elClass: this.$u.guid(),
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starBoxLeft: 0, // 评分盒子左边到屏幕左边的距离,用于滑动选择时计算距离
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// 当前激活的星星的index,如果存在value,优先使用value,因为它可以双向绑定(1.4.5新增)
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activeIndex: this.value,
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starWidth: 0, // 每个星星的宽度
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moving: false,
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}
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},
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watch: {
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current(val) {
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this.activeIndex = val
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},
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value(val) {
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this.activeIndex = val;
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},
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},
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mounted() {
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this.$nextTick(() => {
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this.getElRectById()
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this.getElRectByClass()
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})
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},
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computed: {
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decimal() {
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if (this.disabled) {
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return this.activeIndex * 100 % 100
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} else if (this.allowHalf) {
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return 50
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}
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},
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elActiveColor() {
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const len = this.colors.length
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// 如果有设置colors参数(此参数用于将图标分段,比如一共5颗星,colors传3个颜色值,那么根据一定的规则,2颗星可能为第一个颜色
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// 4颗星为第二个颜色值,5颗星为第三个颜色值)
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if (len && len <= this.count) {
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const step = Math.round(this.activeIndex / Math.round(this.count / len))
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if (step < 1) return this.colors[0]
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if (step > len) return this.colors[len - 1]
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return this.colors[step - 1]
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}
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return this.activeColor
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}
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},
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methods: {
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// 获取评分组件盒子的布局信息
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getElRectById() {
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// uView封装的获取节点的方法,详见文档
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this.$uGetRect('#' + this.elId).then(res => {
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this.starBoxLeft = res.left
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})
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},
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// 获取单个星星的尺寸
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getElRectByClass() {
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// uView封装的获取节点的方法,详见文档
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this.$uGetRect('.' + this.elClass).then(res => {
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this.starWidth = res.width
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})
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},
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// 手指滑动
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touchMove(e) {
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if (!e.changedTouches[0]) return
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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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if (!e.changedTouches[0]) return
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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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common() {
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// uView封装的获取节点的方法,详见文档
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this.$uGetRect('#' + this.elId).then(res => {
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this.starBoxLeft = res.left
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})
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// uView封装的获取节点的方法,详见文档
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this.$uGetRect('.' + this.elClass).then(res => {
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this.starWidth = res.width
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})
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},
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// 通过点击,直接选中
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async clickHandler(i, e) {
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if (this.starWidth == 0 || this.starBoxLeft == 0) await this.common()
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if (uni.$u.os() === "ios" && this.moving) return
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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 = i * this.starWidth + this.starBoxLeft;
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// #endif
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this.getActiveIndex(x, true)
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},
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getActiveIndex(x, isClick = false) {
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if (this.disabled) return
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const allRateWidth = this.starWidth * this.count + this.starBoxLeft;
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// 滑动点相对于评分盒子左边的距离
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x = this.rangeFun(this.starBoxLeft, allRateWidth, x) - this.starBoxLeft
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const distance = x;
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let index;
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if (this.allowHalf) {
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index = Math.floor(distance / this.starWidth);
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// 取余,判断小数的区间范围
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const decimal = distance % this.starWidth;
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if (decimal <= this.starWidth / 2 && decimal > 0) {
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index += 0.5;
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} else if (decimal > this.starWidth / 2) {
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index++;
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}
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} else {
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index = Math.floor(distance / this.starWidth);
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// 取余,判断小数的区间范围
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const decimal = distance % this.starWidth;
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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 (isClick) {
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if (decimal > 0) index++;
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} else {
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if (decimal > this.starWidth / 2) 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) this.activeIndex = this.minCount;
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// 设置延时为了让click事件在touchmove之前触发
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setTimeout(() => {
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this.moving = true;
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}, 10);
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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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// 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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if (this.value != -1) {
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this.$emit('input', this.activeIndex)
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}
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},
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showDecimalIcon(index) {
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return this.disabled && parseInt(this.activeIndex) === index
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},
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rangeFun(min = 0, max = 0, value = 0) {
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return Math.max(min, Math.min(max, Number(value)))
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}
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},
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}
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</script>
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<style scoped lang="scss">
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@import "../../libs/css/style.components.scss";
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$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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display: 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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display: 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> |