<template>
	<view class="container">
		<label class="sel_event" @click="sel_show ()">
			<view class="sel_point">
				<view class="sel_field">
					{{sel_item}}
				</view>
				<view class="triangle" :style="tri_style">
				</view>
			</view>
		</label>
		<u-select v-model="show" value-name="id" label-name="name" mode="single-column" :list="list" @confirm="confirm">
		</u-select>
		<view class="content">
			<view class="table_hed">
				<view class="table_cell_h">
					<span>编号</span>
					<span>名称</span>
					<span class="introduce">介绍</span>
					<span>库存</span>
				</view>
			</view>
			<scroll-view :scroll-top="scrollTop" @scrolltolower="lower()" scroll-y="true" class="scroll-Y"
				v-if="numList != null">
				<view class="table_cell" v-for="(item,i) in numList" :key="item.id">
					<span>{{item.id}}</span>
					<span>{{item.name}}</span>
					<span class="introduce u-line-1">{{item.description}}</span>
					<span>{{item.count}}</span>
				</view>
			</scroll-view>
		</view>

	</view>
</template>

<script>
	import {
		num,
		numType
	} from '@/api/index.js'
	export default {
		data() {
			return {
				sel_item: '', //选择框值
				show: false, //选择框弹出
				tri_style: '', //三角样式
				//物品类别列表
				list: [{
						value: '1',
						label: '电子产品'
					},
					{
						value: '2',
						label: '抗疫物资'
					},
				],
				numList: [], //库存物品列表
				scrollnum: 2, //页码（懒加载）

			}
		},
		onLoad() {
			this.getNumType()
		},
		watch: {
			sel_item(newOption, oldOption) {
				this.getNum(newOption);
			},
			show(newOption, oldOption) {
				if (!newOption) {
					this.tri_style =
						'margin-top: 10rpx;margin-bottom:0rpx;border-top-color:#808080;border-bottom-color:transparent;';
				}
			}
		},
	
		methods: {
			sel_show() {
				this.show = !this.show;
				this.tri_style =
					'margin-top: 0rpx;margin-bottom:10rpx;border-top-color:transparent;border-bottom-color: #808080;';
			},

			lower() {
				this.getNum(this.sel_item, this.scrollnum, 10);
				this.scrollnum += 1;
			},
			//获取库存类别
			async getNumType() {
				let {
					data
				} = await numType()
				this.list.length = 0
				data.list.forEach(ite => {
					this.list.push(ite)
				})
				this.$nextTick(function() {
					this.sel_item = this.list[0].name;
				})
			},
			async getNum(type, page, size) {
				page || (page = 1)
				size || (size = 10)
				let {
					data
				} = await num({
					type,
					page,
					size
				})
				data.list.forEach(ite => {
					this.numList.push(ite)
				})
			},
			// 回调参数为包含多个元素的数组，每个元素分别反应每一列的选择情况
			confirm(e) {
				this.$nextTick(function() {
					this.sel_item = e[0].label;
				})
			
			}
		}
	}
</script>

<style lang="scss">
	.container {
		display: flex;
		flex-direction: column;
		align-items: center;
		width: 100%;
		height: 100%;
		background-color: #FFFFFF;
	}

	.sel_point {
		display: flex;
		justify-content: flex-start;
		align-items: center;
		width: 690rpx;
		height: 30rpx;
		margin: 29rpx 0 38rpx 0;
		text-align: left;
	}

	.sel_field {
		margin-right: 30rpx;
		font-size: 28rpx;
		font-family: Microsoft YaHei-3970(82674968);
		font-weight: 400;
		color: #333333;
		text-indent: 10rpx;
	}

	.triangle {
		margin-top: 10rpx;
		display: inline-block;
		/* Base Style */
		border: solid 10rpx transparent;
		border-top-color: #808080;
	}

	.content {
		display: flex;
		flex-direction: column;
		justify-content: flex-start;
		align-items: center;
		width: 690rpx;
		height: 100%;
		background: #FFFFFF;
		box-shadow: 0px 0px 24px 0px rgba(6, 0, 1, 0.1);
		border-radius: 10px 10px 0px 0px;
		overflow: hidden;

		.table_hed {
			width: 690rpx;
			height: 70rpx;
			background: #EBF8FF;
		}

		.table_cell,
		.table_cell_h {
			display: flex;
			justify-content: space-around;
			align-items: center;
			width: 630rpx;
			height: 70rpx;
			margin: 0 auto;
			border-bottom: solid 1rpx #E6E6E6;

			span {
				width: 140rpx;
				font-size: 28rpx;
				font-family: Microsoft YaHei-3970(82674968);
				font-weight: 400;
				color: #333333;
				text-align: center;
			}

			.introduce {
				max-width: 308rpx;
				overflow: hidden;
				white-space: nowrap;
				text-overflow: ellipsis;
			}
		}

		.table_cell_h {
			border-bottom: none;
		}

		.scroll-Y {
			width: 690rpx;
			height: calc( 100vh - 180rpx );
		}
	}
</style>
