<template>
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<view
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:id="elId"
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class="tn-rate-class tn-rate"
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@touchmove.stop.prevent="touchMove"
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>
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<view class="tn-rate__wrap" :class="[elClass]" v-for="(item, index) in count" :key="index">
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<view
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class="tn-rate__wrap__icon"
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:class="[`tn-icon-${(allowHalf && halfIcon ? activeIndex > index + 1 : activeIndex > index) ? elActionIcon : elInactionIcon}`]"
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:style="[iconStyle(index)]"
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@tap="click(index + 1, $event)"
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>
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<!-- 半图标 -->
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<view
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v-if="showHalfIcon(index)"
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class="tn-rate__wrap__icon--half"
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:class="[`tn-icon-${elActionIcon}`]"
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:style="[halfIconStyle]"
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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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export default {
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name: 'tn-rate',
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props: {
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// 选中星星的数量
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value: {
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type: Number,
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default: 0
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},
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// 显示的星星数
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count: {
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type: Number,
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default: 5
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},
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// 最小能选择的星星数
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minCount: {
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type: Number,
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default: 0
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},
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// 禁用状态
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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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// 是否可以选择半星
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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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// 星星大小
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size: {
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type: Number,
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default: 32
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},
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// 被选中的图标
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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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// 未被选中的图标
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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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// 被选中的颜色
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activeColor: {
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type: String,
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default: '#01BEFF'
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},
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// 默认颜色
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inactiveColor: {
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type: String,
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default: '#AAAAAA'
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},
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// 星星之间的距离
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gutter: {
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type: Number,
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default: 10
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},
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// 自定义颜色
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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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// 自定义图标
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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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computed: {
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// 图标显示的比例
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showHalfIcon(index) {
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return index => {
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return this.allowHalf && Math.ceil(this.activeIndex) === index + 1 && this.halfIcon
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}
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},
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// 被激活的图标
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elActionIcon() {
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const len = this.icons.length
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// icons参数传递了3个图标，当选中2个时，用第一个图标，4个时，用第二个图标
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// 5个时，用第三个图标作为激活的图标
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if (len && len <= this.count) {
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const step = Math.round(Math.ceil(this.activeIndex) / Math.round(this.count / len))
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if (step < 1) return this.icons[0]
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if (step > len) return this.icons[len - 1]
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return this.icons[step - 1]
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}
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return this.activeIcon
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},
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// 未被激活的图标
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elInactionIcon() {
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const len = this.icons.length
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// icons参数传递了3个图标，当选中2个时，用第一个图标，4个时，用第二个图标
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// 5个时，用第三个图标作为激活的图标
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if (len && len <= this.count) {
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const step = Math.round(Math.ceil(this.activeIndex) / Math.round(this.count / len))
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if (step < 1) return this.icons[0]
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if (step > len) return this.icons[len - 1]
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return this.icons[step - 1]
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}
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return this.inactiveIcon
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},
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// 被激活的颜色
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elActionColor() {
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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(Math.ceil(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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// 图标的样式
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iconStyle() {
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return index => {
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let style = {}
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style.fontSize = this.$t.string.getLengthUnitValue(this.size)
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style.padding = `0 ${this.$t.string.getLengthUnitValue(this.gutter / 2)}`
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// 当前图标的颜色
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if (this.allowHalf && this.halfIcon) {
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style.color = this.activeIndex > index + 1 ? this.elActionColor : this.inactiveColor
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} else {
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style.color = this.activeIndex > index ? this.elActionColor : this.inactiveColor
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}
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return style
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}
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},
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// 半图标样式
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halfIconStyle() {
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let style = {}
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style.fontSize = this.$t.string.getLengthUnitValue(this.size)
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style.padding = `0 ${this.$t.string.getLengthUnitValue(this.gutter / 2)}`
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style.color = this.elActionColor
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return style
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}
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},
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data() {
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return {
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// 保证控件的唯一性
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elId: this.$t.uuid(),
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elClass: this.$t.uuid(),
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// 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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starBoxLeft: 0,
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// 当前激活的星星的序号
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activeIndex: this.value,
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// 每个星星的宽度
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starWidth: 0,
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// 每个星星最右边到盒子组件最左边的距离
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starWidthArr: [],
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// 标记是否为半图标
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halfIcon: 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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if (this.allowHalf && (val % 1 === 0.5)) {
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this.halfIcon = true
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} else {
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this.halfIcon = false
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}
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},
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size() {
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// 当尺寸修改的时候重新获取布局尺寸信息
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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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},
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mounted() {
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this.getElRectById()
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this.getElRectByClass()
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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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this._tGetRect('#'+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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this._tGetRect('.'+this.elClass).then(res => {
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this.starWidth = res.width
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// 把每个星星最右边到盒子最左边的距离
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for (let i = 0; i < this.count; i++) {
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this.starWidthArr[i] = (i + 1) * this.starWidth
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}
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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 (this.disabled) return
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if (!e.changedTouches[0]) return
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const movePageX = e.changedTouches[0].pageX
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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 = movePageX - this.starBoxLeft
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// 如果滑动到了评分盒子的左边界，设置为0星
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if (distance <= 0) {
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this.activeIndex = 0
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}
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// 计算滑动的距离相当于点击多少颗星星
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let index = Math.ceil(distance / this.starWidth)
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if (this.allowHalf) {
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const iconHalfWidth = this.starWidthArr[index - 1] - (this.starWidth / 2)
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if (distance < iconHalfWidth) {
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this.halfIcon = true
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index -= 0.5
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} else {
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this.halfIcon = false
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}
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}
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this.activeIndex = index > this.count ? this.count : index
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if (this.activeIndex < this.minCount) this.activeIndex = this.minCount
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this.emitEvent()
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},
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// 通过点击直接选中
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click(index, e) {
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if (this.disabled) return
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// 半星选择
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if (this.allowHalf) {
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if (!e.changedTouches[0]) return
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const movePageX = e.changedTouches[0].pageX
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// 点击点相对于当前图标左边的距离
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const distance = movePageX - this.starBoxLeft
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const iconHalfWidth = this.starWidthArr[index - 1] - (this.starWidth / 2)
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if (distance < iconHalfWidth) {
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this.halfIcon = true
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} else {
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this.halfIcon = false
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}
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}
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// 对第一个星星特殊处理，只有一个的时候，点击可以取消，否则无法作0星评价
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if (index == 1) {
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if (this.allowHalf && this.allowHalf) {
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if ((this.activeIndex === 0.5 && this.halfIcon) ||
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(this.activeIndex === 1 && !this.halfIcon)) {
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this.activeIndex = 0
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} else {
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this.activeIndex = this.halfIcon ? 0.5 : 1
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}
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} else {
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if (this.activeIndex == 1) {
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this.activeIndex = 0
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} else {
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this.activeIndex = 1
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}
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}
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} else {
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this.activeIndex = (this.allowHalf && this.halfIcon) ? index - 0.5 : index
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}
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if (this.activeIndex < this.minCount) this.activeIndex = this.minCount
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this.emitEvent()
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},
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// 发送事件
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emitEvent() {
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this.$emit('change', this.activeIndex)
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// 修改v-model的值
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this.$emit('input', this.activeIndex)
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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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.tn-rate {
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display: inline-flex;
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align-items: center;
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margin: 0;
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padding: 0;
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&__wrap {
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&__icon {
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position: relative;
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box-sizing: border-box;
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&--half {
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position: absolute;
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top: 0;
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left: 0;
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display: inline-block;
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overflow: hidden;
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width: 50%;
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}
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}
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}
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}
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</style>
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