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