<template>
    <view class="ep-picker-box">
        <!-- 蒙版区域 开始 -->
        <view class="ep-mask-box" v-show="show" @click="show=false"></view>
        <!-- 蒙版区域 开始 -->
        
        <!-- 输入框区域 开始 -->
        <view class="ep-input-box"  :class="{'disabled':disabled}">
			<uni-row>
				<uni-col :span="21">
					<view style="display: flex;align-items: center;min-height: 36px;" @click="openOptions">{{showLabel}}</view>
				</uni-col>
				<uni-col :span="3">
					<view v-if="show" style="display: flex;align-items: center;min-height: 36px;">
						<uni-row v-if="closefalg">
							<uni-col :span="12">
								<uni-icons type="closeempty" size="20" @click="closevalue()"></uni-icons>
							</uni-col>
						</uni-row>
						<uni-row v-if="!closefalg">
							<uni-col :span="12">
								<uni-icons type="top" size="20" @click="openOptions"></uni-icons>
							</uni-col>
						</uni-row>						
					</view>
					<view v-else style="display: flex;align-items: center;min-height: 36px;">
						<uni-row v-if="closefalg">
							<uni-col :span="12">
								<uni-icons type="closeempty" size="20" @click="closevalue()"></uni-icons>
							</uni-col>
						</uni-row>
						<uni-row v-if="!closefalg">
							<uni-col :span="12">
								<uni-icons type="bottom" size="20" @click="openOptions"></uni-icons>
							</uni-col>
						</uni-row>
					</view>
					
				</uni-col>
			</uni-row>
            <!-- <view style="display: flex;align-items: center;min-height: 36px;">{{showLabel}}</view>
			<uni-icons type="top" size="30"></uni-icons> -->
            <!-- <text v-if="!show" class="iconfont icon-xiala"></text>
            <text v-else class="iconfont icon-xialashang"></text> -->
        </view>
        <!-- 输入框区域 结束 -->
        
        <!-- 弹出的下拉区域 开始 -->
        <view v-show="show" class="ep-picker-content-wrap">
            <scroll-view class="ep-picker-content" :scroll-y="true">
                <!-- 展示下拉项列表 开始 -->
                <view v-for="(item,iu) in options" :key="item[value_key]" 
                :class="{'disabled':upss(item.disabled),'active':value==item[value_key]}"
                class="option-item"
                @click="itemClick(item)"
                >{{item[label_key]}}</view>
                <!-- 展示下拉项列表 结束 -->
                
                <!-- 下拉列表为空 开始 -->
                <view v-if="options.length==0" class="option-no-data">无数据</view>
                <!-- 下拉列表为空 结束 -->
            </scroll-view>
            <text class="triangle"></text>
        </view>
        <!-- 弹出的下拉区域 结束 -->
    </view>
</template>

<script>
    export default{
        data(){
            return {
                show: false,
                left: 0,
				closefalg:false,
                
            }
        },
        props:{
            value:{
                type:[String,Number],
                default:""
            },
            options:{
                type: Array,
                default: function(){
                    return []
                }
            },
            value_key:{
                type:String,
                default:"value"
            },
            label_key:{
                type:String,
                default:"label"
            },
            disabled:{
                type:Boolean,
                default:false
            },
			labletitle:{
			    type:String,
			    default:'请选择'
			}
        },
        model:{
            prop:'value',
            event:"valChange"
        },
        methods:{ 
			upss(it){
				return true
			},
			closevalue(item){
				//修改v-model的值
				this.$emit('valChange','')
				//将事件通知父组件
				this.$emit('change','')
				this.closefalg = false
			},
            //点击选中选项
            itemClick(item){
                if(item.disabled) return
                
                //关闭
                this.show = false
                //修改v-model的值
                this.$emit('valChange',item[this.value_key])
                //将事件通知父组件
                this.$emit('change',item[this.value_key])
				this.closefalg = true
            },
            //展开选项
            openOptions(){
                if(!this.disabled){
                    this.show  = true
                }
            }
        },
        computed:{
            showLabel(){
                var index = this.options.findIndex(item=>{
                    return item[this.value_key] == this.value
                })
                if(index != -1){
                    return this.options[index][this.label_key]
                }else if(!this.value){
                    return this.labletitle
                }else{
                    return this.value
                }
				
				// if(!this.label_key){
				// 	this.closefalg = true
				// }else{
				// 	this.closefalg = false
				// }
            }
        }
    }
</script>

<style scoped>
    /* 引入字体图标 */
    /* @import './iconfont.css'; */
    
    .ep-picker-box{
        width:100%;
        box-sizing: border-box;
        position: relative;
        font-size: 14px;
        color: #333;
        /* max-width: 300px; */
    }
    .ep-mask-box{
        position: fixed;
        z-index: 999;
        top: 0;
        right: 0;
        left: 0;
        bottom: 0;
        background:none;
    }
    .ep-input-box{
        border: 1px solid rgb(229, 229, 229);
        border-radius: 4px;
        padding-left:10px;
        position: relative;
        cursor: pointer;
    }
    /* 整个下拉组件禁用样式 */
    .ep-input-box.disabled{
        cursor:not-allowed;
        background-color: #f5f7fa;
        color: #999;
    }
    /* 展开收起箭头样式 */
    .ep-input-box .iconfont{
        position: absolute;
        top: 50%;
        right: 5px;
        font-size: 20px;
        transform: translateY(-50%);
        color:#B8B8B8;
    }
    /* 下拉容器样式 外层 */
    .ep-picker-content-wrap{
        width: 100%;
        position: absolute;
        top: 45px;
        left: 0; 
        z-index: 9999;
        padding-top:6px;
    }
    /* 下拉容器样式 内层 */
    .ep-picker-content-wrap .ep-picker-content{
        background-color: #fff;
        padding:3px 0;        
        box-shadow: 0 0 20px 5px rgb(0 0 0 / 30%);
        border-radius: 5px;
        max-height:181px;
    }
    /* 下拉项通用样式 */
    .ep-picker-content-wrap .ep-picker-content .option-item{
        padding: 8px 18px;
        cursor: pointer;
    }
    /* 无下拉项数据时样式 */
    .ep-picker-content-wrap .ep-picker-content .option-no-data{
        padding: 8px 18px;
        cursor: text;
        color:#999;
        text-align: center;
    }
    /* 鼠标移入下拉项样式 */
    .ep-picker-content-wrap .ep-picker-content .option-item:hover{
        background-color: #f5f7fa;
    }
    /* 已选中的下拉项样式 */
    .ep-picker-content-wrap .ep-picker-content .option-item.active{
        color:#007AFF; 
    }
    /* 禁用的下拉项样式 */
    .ep-picker-content-wrap .ep-picker-content .option-item.disabled{
        color:#c0c4cc; 
    }
    .ep-picker-content-wrap .ep-picker-content .option-item.disabled:hover{
        cursor:not-allowed;
    }
    
    /* 下拉容器指示箭头样式 */
    .ep-picker-content-wrap .triangle{
        width: 0;
        height: 0;
        border-top: 6px solid rgba(0,0,0,0);
        border-right: 6px solid rgba(0,0,0,0);
        border-bottom: 6px solid #fff;
        border-left: 6px solid rgba(0,0,0,0);
        position: absolute;
        top:-6px;
        left:50%;
        transform: translateX(-50%);
        box-sizing: content-box;
    }
    
</style>
