<template> 
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    <view class="u-mask" hover-stop-propagation :style="[maskStyle, zoomStyle]" @tap="click" @touchmove.stop.prevent="() => {}" :class="{ 
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        'u-mask-zoom': zoom, 
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        'u-mask-show': show 
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    }"> 
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        <slot /> 
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    </view> 
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</template> 
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<script> 
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    /** 
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     * mask 遮罩 
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     * @description 创建一个遮罩层,用于强调特定的页面元素,并阻止用户对遮罩下层的内容进行操作,一般用于弹窗场景 
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     * @tutorial https://www.uviewui.com/components/mask.html 
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     * @property {Boolean} show 是否显示遮罩(默认false) 
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     * @property {String Number} z-index z-index 层级(默认1070) 
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     * @property {Object} custom-style 自定义样式对象,见上方说明 
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     * @property {String Number} duration 动画时长,单位毫秒(默认300) 
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     * @property {Boolean} zoom 是否使用scale对遮罩进行缩放(默认true) 
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     * @property {Boolean} mask-click-able 遮罩是否可点击,为false时点击不会发送click事件(默认true) 
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     * @event {Function} click mask-click-able为true时,点击遮罩发送此事件 
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     * @example <u-mask :show="show" @click="show = false"></u-mask> 
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     */ 
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    export default { 
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        name: "u-mask", 
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        props: { 
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            // 是否显示遮罩 
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            show: { 
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                type: Boolean, 
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                default: false 
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            }, 
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            // 层级z-index 
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            zIndex: { 
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                type: [Number, String], 
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                default: '' 
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            }, 
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            // 用户自定义样式 
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            customStyle: { 
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                type: Object, 
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                default () { 
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                    return {} 
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                } 
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            }, 
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            // 遮罩的动画样式, 是否使用使用zoom进行scale进行缩放 
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            zoom: { 
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                type: Boolean, 
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                default: true 
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            }, 
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            // 遮罩的过渡时间,单位为ms 
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            duration: { 
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                type: [Number, String], 
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                default: 300 
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            }, 
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            // 是否可以通过点击遮罩进行关闭 
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            maskClickAble: { 
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                type: Boolean, 
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                default: true 
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            } 
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        }, 
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        data() { 
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            return { 
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                zoomStyle: { 
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                    transform: '' 
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                }, 
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                scale: 'scale(1.2, 1.2)' 
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            } 
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        }, 
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        watch: { 
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            show(n) { 
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                if(n && this.zoom) { 
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                    // 当展示遮罩的时候,设置scale为1,达到缩小(原来为1.2)的效果 
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                    this.zoomStyle.transform = 'scale(1, 1)'; 
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                } else if(!n && this.zoom) { 
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                    // 当隐藏遮罩的时候,设置scale为1.2,达到放大(因为显示遮罩时已重置为1)的效果 
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                    this.zoomStyle.transform = this.scale; 
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                } 
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            } 
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        }, 
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        computed: { 
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            maskStyle() { 
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                let style = {}; 
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                style.backgroundColor = "rgba(0, 0, 0, 0.6)"; 
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                if(this.show) style.zIndex = this.zIndex ? this.zIndex : this.$u.zIndex.mask; 
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                else style.zIndex = -1; 
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                style.transition = `all ${this.duration / 1000}s ease-in-out`; 
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                // 判断用户传递的对象是否为空,不为空就进行合并 
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                if (Object.keys(this.customStyle).length) style = {  
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                    ...style, 
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                    ...this.customStyle 
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                }; 
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                return style; 
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            } 
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        }, 
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        methods: { 
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            click() { 
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                if (!this.maskClickAble) return; 
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                this.$emit('click'); 
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            } 
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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/style.components.scss"; 
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    .u-mask { 
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        position: fixed; 
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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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        opacity: 0; 
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        transition: transform 0.3s; 
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    } 
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    .u-mask-show { 
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        opacity: 1; 
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    } 
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    .u-mask-zoom { 
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        transform: scale(1.2, 1.2); 
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    } 
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</style> 
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