<template>  
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    <view class="u-popup">  
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        <u-overlay  
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            :show="show"  
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            @click="overlayClick"  
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            v-if="overlay"  
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            :duration="overlayDuration"  
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            :customStyle="overlayStyle"  
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            :opacity="overlayOpacity"  
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        ></u-overlay>  
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        <u-transition  
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            :show="show"  
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            :customStyle="transitionStyle"  
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            :mode="position"  
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            :duration="duration"  
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            @afterEnter="afterEnter"  
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            @click="clickHandler"  
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        >  
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            <view  
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                class="u-popup__content"  
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                :style="[contentStyle]"  
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                @tap.stop="noop"  
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            >  
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                <u-status-bar v-if="safeAreaInsetTop"></u-status-bar>  
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                <slot></slot>  
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                <view  
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                    v-if="closeable"  
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                    @tap.stop="close"  
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                    class="u-popup__content__close"  
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                    :class="['u-popup__content__close--' + closeIconPos]"  
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                    hover-class="u-popup__content__close--hover"  
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                    hover-stay-time="150"  
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                >  
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                    <u-icon  
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                        name="close"  
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                        color="#909399"  
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                        size="18"  
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                        bold  
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                    ></u-icon>  
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                </view>  
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                <u-safe-bottom v-if="safeAreaInsetBottom"></u-safe-bottom>  
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            </view>  
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        </u-transition>  
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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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    /**  
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     * popup 弹窗  
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     * @description 弹出层容器,用于展示弹窗、信息提示等内容,支持上、下、左、右和中部弹出。组件只提供容器,内部内容由用户自定义  
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     * @tutorial https://www.uviewui.com/components/popup.html  
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     * @property {Boolean}            show                是否展示弹窗 (默认 false )  
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     * @property {Boolean}            overlay                是否显示遮罩 (默认 true )  
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     * @property {String}            mode                弹出方向(默认 'bottom' )  
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     * @property {String | Number}    duration            动画时长,单位ms (默认 300 )  
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     * @property {String | Number}    overlayDuration            遮罩层动画时长,单位ms (默认 350 )  
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     * @property {Boolean}            closeable            是否显示关闭图标(默认 false )  
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     * @property {Object | String}    overlayStyle        自定义遮罩的样式  
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     * @property {String | Number}    overlayOpacity        遮罩透明度,0-1之间(默认 0.5)  
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     * @property {Boolean}            closeOnClickOverlay    点击遮罩是否关闭弹窗 (默认  true )  
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     * @property {String | Number}    zIndex                层级 (默认 10075 )  
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     * @property {Boolean}            safeAreaInsetBottom    是否为iPhoneX留出底部安全距离 (默认 true )  
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     * @property {Boolean}            safeAreaInsetTop    是否留出顶部安全距离(状态栏高度) (默认 false )  
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     * @property {String}            closeIconPos        自定义关闭图标位置(默认 'top-right' )  
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     * @property {String | Number}    round                圆角值(默认 0)  
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     * @property {Boolean}            zoom                当mode=center时 是否开启缩放(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} open 弹出层打开  
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     * @event {Function} close 弹出层收起  
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     * @example <u-popup v-model="show"><text>出淤泥而不染,濯清涟而不妖</text></u-popup>  
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     */  
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    export default {  
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        name: 'u-popup',  
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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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                overlayDuration: this.duration + 50  
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            }  
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        },  
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        watch: {  
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            show(newValue, oldValue) {  
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                if (newValue === true) {  
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                    // #ifdef MP-WEIXIN  
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                    const children = this.$children  
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                    this.retryComputedComponentRect(children)  
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                    // #endif  
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                }  
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            }  
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        },  
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        computed: {  
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            transitionStyle() {  
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                const style = {  
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                    zIndex: this.zIndex,  
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                    position: 'fixed',  
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                    display: 'flex',  
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                }  
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                style[this.mode] = 0  
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                if (this.mode === 'left') {  
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                    return uni.$u.deepMerge(style, {  
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                        bottom: 0,  
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                        top: 0,  
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                    })  
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                } else if (this.mode === 'right') {  
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                    return uni.$u.deepMerge(style, {  
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                        bottom: 0,  
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                        top: 0,  
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                    })  
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                } else if (this.mode === 'top') {  
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                    return uni.$u.deepMerge(style, {  
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                        left: 0,  
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                        right: 0  
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                    })  
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                } else if (this.mode === 'bottom') {  
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                    return uni.$u.deepMerge(style, {  
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                        left: 0,  
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                        right: 0,  
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                    })  
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                } else if (this.mode === 'center') {  
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                    return uni.$u.deepMerge(style, {  
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                        alignItems: 'center',  
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                        'justify-content': 'center',  
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                        top: 0,  
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                        left: 0,  
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                        right: 0,  
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                        bottom: 0  
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                    })  
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                }  
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            },  
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            contentStyle() {  
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                const style = {}  
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                // 通过设备信息的safeAreaInsets值来判断是否需要预留顶部状态栏和底部安全局的位置  
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                // 不使用css方案,是因为nvue不支持css的iPhoneX安全区查询属性  
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                const {  
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                    safeAreaInsets  
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                } = uni.$u.sys()  
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                if (this.mode !== 'center') {  
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                    style.flex = 1  
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                }  
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                // 背景色,一般用于设置为transparent,去除默认的白色背景  
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                if (this.bgColor) {  
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                    style.backgroundColor = this.bgColor  
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                }  
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                if(this.round) {  
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                    const value = uni.$u.addUnit(this.round)  
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                    if(this.mode === 'top') {  
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                        style.borderBottomLeftRadius = value  
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                        style.borderBottomRightRadius = value  
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                    } else if(this.mode === 'bottom') {  
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                        style.borderTopLeftRadius = value  
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                        style.borderTopRightRadius = value  
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                    } else if(this.mode === 'center') {  
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                        style.borderRadius = value  
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                    }   
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                }  
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                return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle))  
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            },  
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            position() {  
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                if (this.mode === 'center') {  
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                    return this.zoom ? 'fade-zoom' : 'fade'  
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                }  
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                if (this.mode === 'left') {  
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                    return 'slide-left'  
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                }  
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                if (this.mode === 'right') {  
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                    return 'slide-right'  
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                }  
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                if (this.mode === 'bottom') {  
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                    return 'slide-up'  
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                }  
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                if (this.mode === 'top') {  
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                    return 'slide-down'  
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                }  
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            },  
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        },  
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        methods: {  
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            // 点击遮罩  
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            overlayClick() {  
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                if (this.closeOnClickOverlay) {  
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                    this.$emit('close')  
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                }  
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            },  
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            close(e) {  
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                this.$emit('close')  
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            },  
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            afterEnter() {  
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                this.$emit('open')  
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            },  
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            clickHandler() {  
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                // 由于中部弹出时,其u-transition占据了整个页面相当于遮罩,此时需要发出遮罩点击事件,是否无法通过点击遮罩关闭弹窗  
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                if(this.mode === 'center') {  
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                    this.overlayClick()  
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                }  
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                this.$emit('click')  
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            },  
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            // #ifdef MP-WEIXIN  
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            retryComputedComponentRect(children) {  
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                // 组件内部需要计算节点的组件  
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                const names = ['u-calendar-month', 'u-album', 'u-collapse-item', 'u-dropdown', 'u-index-item', 'u-index-list',  
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                    'u-line-progress', 'u-list-item', 'u-rate', 'u-read-more', 'u-row', 'u-row-notice', 'u-scroll-list',  
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                    'u-skeleton', 'u-slider', 'u-steps-item', 'u-sticky', 'u-subsection', 'u-swipe-action-item', 'u-tabbar',  
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                    'u-tabs', 'u-tooltip'  
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                ]  
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                // 历遍所有的子组件节点  
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                for (let i = 0; i < children.length; i++) {  
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                    const child = children[i]  
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                    // 拿到子组件的子组件  
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                    const grandChild = child.$children  
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                    // 判断如果在需要重新初始化的组件数组中名中,并且存在init方法的话,则执行  
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                    if (names.includes(child.$options.name) && typeof child?.init === 'function') {  
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                        // 需要进行一定的延时,因为初始化页面需要时间  
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                        uni.$u.sleep(50).then(() => {  
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                            child.init()  
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                        })  
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                    }  
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                    // 如果子组件还有孙组件,进行递归历遍  
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                    if (grandChild.length) {  
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                        this.retryComputedComponentRect(grandChild)  
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                    }  
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                }  
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            }  
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            // #endif  
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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-popup-flex:1 !default;  
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    $u-popup-content-background-color: #fff !default;  
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    .u-popup {  
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        flex: $u-popup-flex;  
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        &__content {  
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            background-color: $u-popup-content-background-color;  
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            position: relative;  
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            &--round-top {  
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                border-top-left-radius: 0;  
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                border-top-right-radius: 0;  
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                border-bottom-left-radius: 10px;  
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                border-bottom-right-radius: 10px;  
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            }  
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            &--round-left {  
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                border-top-left-radius: 0;  
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                border-top-right-radius: 10px;  
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                border-bottom-left-radius: 0;  
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                border-bottom-right-radius: 10px;  
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            }  
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            &--round-right {  
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                border-top-left-radius: 10px;  
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                border-top-right-radius: 0;  
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                border-bottom-left-radius: 10px;  
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                border-bottom-right-radius: 0;  
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            }  
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            &--round-bottom {  
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                border-top-left-radius: 10px;  
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                border-top-right-radius: 10px;  
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                border-bottom-left-radius: 0;  
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                border-bottom-right-radius: 0;  
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            }  
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            &--round-center {  
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                border-top-left-radius: 10px;  
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                border-top-right-radius: 10px;  
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                border-bottom-left-radius: 10px;  
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                border-bottom-right-radius: 10px;  
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            }  
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            &__close {  
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                position: absolute;  
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                &--hover {  
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                    opacity: 0.4;  
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                }  
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            }  
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            &__close--top-left {  
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                top: 15px;  
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                left: 15px;  
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            }  
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            &__close--top-right {  
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                top: 15px;  
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                right: 15px;  
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            }  
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            &__close--bottom-left {  
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                bottom: 15px;  
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                left: 15px;  
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            }  
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            &__close--bottom-right {  
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                right: 15px;  
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                bottom: 15px;  
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            }  
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        }  
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    }  
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</style>  
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