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			305 lines
		
	
	
		
			9.8 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
			
		
		
	
	
			305 lines
		
	
	
		
			9.8 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
<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 {Boolean}			readonly		是否只读 (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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			activeIndex: 'emitEvent'
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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.$u.os() === "ios" && this.moving) {
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					return;
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				}
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				this.preventEvent(e);
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				let x = 0;
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				// 点击时,在nvue上,无法获得点击的坐标,所以无法实现点击半星选择
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				// #ifndef APP-NVUE
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				x = e.changedTouches[0].pageX;
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				// #endif
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				// #ifdef APP-NVUE
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				// nvue下,无法通过点击获得坐标信息,这里通过元素的位置尺寸值模拟坐标
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				x = index * this.rateWidth + this.rateBoxLeft;
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				// #endif
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				this.getActiveIndex(x,true);
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			},
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			// 发出事件
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			emitEvent() {
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				// 发出change事件
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				this.$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.$emit("input", this.activeIndex);
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			},
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			// 获取当前激活的评分图标
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			getActiveIndex(x,isClick = false) {
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				if (this.disabled || this.readonly) {
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					return;
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				}
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				// 判断当前操作的点的x坐标值,是否在允许的边界范围内
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				const allRateWidth = this.rateWidth * this.count + this.rateBoxLeft;
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				// 如果小于第一个图标的左边界,设置为最小值,如果大于所有图标的宽度,则设置为最大值
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				x = uni.$u.range(this.rateBoxLeft, allRateWidth, x) - this.rateBoxLeft
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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 (isClick){
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						if (decimal > 0) index++;
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					} else {
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						if (decimal > this.rateWidth / 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) {
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					this.activeIndex = this.minCount;
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				}
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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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			},
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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" scoped>
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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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