<template>
	<view
		class="u-switch"
		:class="[valueCom == true ? 'u-switch--on' : '', disabled ? 'u-switch--disabled' : '']"
		@tap="onClick"
		:style="[switchStyle]"
	>
		<view
			class="u-switch__node node-class"
			:style="{
				width: $u.addUnit(size),
				height: $u.addUnit(size)
			}"
		>
			<u-loading
				:show="loading"
				class="u-switch__loading"
				:size="size * 0.6"
				:color="loadingColor || '#c7c7c7'"
			/>
		</view>
	</view>
</template>

<script>
/**
 * switch 开关选择器
 * @description 选择开关一般用于只有两个选择，且只能选其一的场景。
 * @tutorial https://www.uviewui.com/components/switch.html
 * @property {Boolean} loading 是否处于加载中（默认false）
 * @property {Boolean} disabled 是否禁用（默认false）
 * @property {String Number} size 开关尺寸，单位rpx（默认50）
 * @property {String} active-color 打开时的背景色（默认#2979ff）
 * @property {Boolean} inactive-color 关闭时的背景色（默认#ffffff）
 * @property {Boolean | Number | String} active-value 打开选择器时通过change事件发出的值（默认true）
 * @property {Boolean | Number | String} inactive-value 关闭选择器时通过change事件发出的值（默认false）
 * @event {Function} change 在switch打开或关闭时触发
 * @example <u-switch v-model="checked" active-color="red" inactive-color="#eee"></u-switch>
 */
export default {
	name: "u-switch",
	emits: ["update:modelValue", "input", "change"],
	props: {
		// 通过v-model双向绑定的值
		value: {
			type: Boolean,
			default: false
		},
		modelValue: {
			type: Boolean,
			default: false
		},
		// 是否为加载中状态
		loading: {
			type: Boolean,
			default: false
		},
		// 是否为禁用装填
		disabled: {
			type: Boolean,
			default: false
		},
		// 开关尺寸，单位rpx
		size: {
			type: [Number, String],
			default: 50
		},
		// 打开时的背景颜色
		activeColor: {
			type: String,
			default: "#2979ff"
		},
		// 关闭时的背景颜色
		inactiveColor: {
			type: String,
			default: "#ffffff"
		},
		// 是否使手机发生短促震动，目前只在iOS的微信小程序有效(2020-05-06)
		vibrateShort: {
			type: Boolean,
			default: false
		},
		// 打开选择器时的值
		activeValue: {
			type: [Number, String, Boolean],
			default: true
		},
		// 关闭选择器时的值
		inactiveValue: {
			type: [Number, String, Boolean],
			default: false
		}
	},
	data() {
		return {};
	},
	computed: {
		valueCom() {
			// #ifdef VUE2
			return this.value;
			// #endif

			// #ifdef VUE3
			return this.modelValue;
			// #endif
		},
		switchStyle() {
			let style = {};
			style.fontSize = this.size + "rpx";
			style.backgroundColor = this.valueCom ? this.activeColor : this.inactiveColor;
			return style;
		},
		loadingColor() {
			return this.valueCom ? this.activeColor : null;
		}
	},
	methods: {
		onClick() {
			if (!this.disabled && !this.loading) {
				// 使手机产生短促震动，微信小程序有效，APP(HX 2.6.8)和H5无效
				if (this.vibrateShort) uni.vibrateShort();
				this.$emit("input", !this.valueCom);
				this.$emit("update:modelValue", !this.valueCom);
				// 放到下一个生命周期，因为双向绑定的value修改父组件状态需要时间，且是异步的
				this.$nextTick(() => {
					this.$emit("change", this.valueCom ? this.activeValue : this.inactiveValue);
				});
			}
		}
	}
};
</script>

<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";

.u-switch {
	position: relative;
	/* #ifndef APP-NVUE */
	display: inline-block;
	/* #endif */
	box-sizing: initial;
	width: 2em;
	height: 1em;
	background-color: #fff;
	border: 1px solid rgba(0, 0, 0, 0.1);
	border-radius: 1em;
	transition: background-color 0.3s;
	font-size: 50rpx;
}

.u-switch__node {
	@include vue-flex;
	align-items: center;
	justify-content: center;
	position: absolute;
	top: 0;
	left: 0;
	border-radius: 100%;
	z-index: 1;
	background-color: #fff;
	background-color: #fff;
	box-shadow: 0 3px 1px 0 rgba(0, 0, 0, 0.05), 0 2px 2px 0 rgba(0, 0, 0, 0.1),
		0 3px 3px 0 rgba(0, 0, 0, 0.05);
	box-shadow: 0 3px 1px 0 rgba(0, 0, 0, 0.05), 0 2px 2px 0 rgba(0, 0, 0, 0.1),
		0 3px 3px 0 rgba(0, 0, 0, 0.05);
	transition: transform 0.3s cubic-bezier(0.3, 1.05, 0.4, 1.05);
	transition: transform 0.3s cubic-bezier(0.3, 1.05, 0.4, 1.05),
		-webkit-transform 0.3s cubic-bezier(0.3, 1.05, 0.4, 1.05);
	transition: transform cubic-bezier(0.3, 1.05, 0.4, 1.05);
	transition: transform 0.3s cubic-bezier(0.3, 1.05, 0.4, 1.05);
}

.u-switch__loading {
	@include vue-flex;
	align-items: center;
	justify-content: center;
}

.u-switch--on {
	background-color: #1989fa;
}

.u-switch--on .u-switch__node {
	transform: translateX(100%);
}

.u-switch--disabled {
	opacity: 0.4;
}
</style>