// 定义一个一定时间后自动成功的promise,让调用nextTick方法处,进入下一个then方法  
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const nextTick = () => new Promise(resolve => setTimeout(resolve, 1000 / 50))  
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// nvue动画模块实现细节抽离在外部文件  
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import animationMap from './nvue.ani-map.js'  
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// #ifndef APP-NVUE  
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// 定义类名,通过给元素动态切换类名,赋予元素一定的css动画样式  
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const getClassNames = (name) => ({  
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    enter: `u-${name}-enter u-${name}-enter-active`,  
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    'enter-to': `u-${name}-enter-to u-${name}-enter-active`,  
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    leave: `u-${name}-leave u-${name}-leave-active`,  
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    'leave-to': `u-${name}-leave-to u-${name}-leave-active`  
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})  
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// #endif  
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// #ifdef APP-NVUE  
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// 引入nvue(weex)的animation动画模块,文档见:  
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// https://weex.apache.org/zh/docs/modules/animation.html#transition  
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const animation = uni.requireNativePlugin('animation')  
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const getStyle = (name) => animationMap[name]  
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// #endif  
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export default {  
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    methods: {  
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        // 组件被点击发出事件  
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        clickHandler() {  
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            this.$emit('click')  
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        },  
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        // #ifndef APP-NVUE  
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        // vue版本的组件进场处理  
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         vueEnter() {  
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            // 动画进入时的类名  
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            const classNames = getClassNames(this.mode)  
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            // 定义状态和发出动画进入前事件  
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            this.status = 'enter'  
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            this.$emit('beforeEnter')  
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            this.inited = true  
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            this.display = true  
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            this.classes = classNames.enter  
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            this.$nextTick(async () => {  
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                // #ifdef H5  
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                await uni.$u.sleep(20)  
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                // #endif  
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                // 标识动画尚未结束  
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                this.$emit('enter')  
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                this.transitionEnded = false  
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                // 组件动画进入后触发的事件  
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                this.$emit('afterEnter')  
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                // 赋予组件enter-to类名  
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                this.classes = classNames['enter-to']  
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            })  
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        },  
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        // 动画离场处理  
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        vueLeave() {  
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            // 如果不是展示状态,无需执行逻辑  
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            if (!this.display) return  
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            const classNames = getClassNames(this.mode)  
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            // 标记离开状态和发出事件  
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            this.status = 'leave'  
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            this.$emit('beforeLeave')  
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            // 获得类名  
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            this.classes = classNames.leave  
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            this.$nextTick(() => {  
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               // 动画正在离场的状态  
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               this.transitionEnded = false  
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               this.$emit('leave')  
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                // 组件执行动画,到了执行的执行时间后,执行一些额外处理  
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                setTimeout(this.onTransitionEnd, this.duration)  
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                this.classes = classNames['leave-to']  
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            })  
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        },  
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        // #endif  
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        // #ifdef APP-NVUE  
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        // nvue版本动画进场  
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        nvueEnter() {  
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            // 获得样式的名称  
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            const currentStyle = getStyle(this.mode)  
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            // 组件动画状态和发出事件  
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            this.status = 'enter'  
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            this.$emit('beforeEnter')  
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            // 展示生成组件元素  
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            this.inited = true  
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            this.display = true  
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            // 在nvue安卓上,由于渲染速度慢,在弹窗,键盘,日历等组件中,渲染其中的内容需要时间  
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            // 导致出现弹窗卡顿,这里让其一开始为透明状态,等一定时间渲染完成后,再让其隐藏起来,再让其按正常逻辑出现  
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            this.viewStyle = {  
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                opacity: 0  
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            }  
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            // 等待弹窗内容渲染完成  
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            this.$nextTick(() => {  
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                // 合并样式  
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                this.viewStyle = currentStyle.enter  
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                Promise.resolve()  
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                    .then(nextTick)  
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                    .then(() => {  
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                        // 组件开始进入前的事件  
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                        this.$emit('enter')  
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                        // nvue的transition动画模块需要通过ref调用组件,注意此处的ref不同于vue的this.$refs['u-transition']用法  
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                        animation.transition(this.$refs['u-transition'].ref, {  
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                            styles: currentStyle['enter-to'],  
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                            duration: this.duration,  
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                            timingFunction: this.timingFunction,  
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                            needLayout: false,  
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                            delay: 0  
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                        }, () => {  
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                            // 动画执行完毕,发出事件  
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                            this.$emit('afterEnter')  
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                        })  
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                    })  
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                    .catch(() => {})  
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            })  
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        },  
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        nvueLeave() {  
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            if (!this.display) {  
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                return  
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            }  
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            const currentStyle = getStyle(this.mode)  
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            // 定义状态和事件  
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            this.status = 'leave'  
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            this.$emit('beforeLeave')  
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            // 合并样式  
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            this.viewStyle = currentStyle.leave  
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            // 放到promise中处理执行过程  
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            Promise.resolve()  
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                .then(nextTick) // 等待几十ms  
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                .then(() => {  
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                    this.transitionEnded = false  
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                    // 动画正在离场的状态  
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                    this.$emit('leave')  
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                    animation.transition(this.$refs['u-transition'].ref, {  
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                        styles: currentStyle['leave-to'],  
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                        duration: this.duration,  
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                        timingFunction: this.timingFunction,  
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                        needLayout: false,  
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                        delay: 0  
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                    }, () => {  
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                        this.onTransitionEnd()  
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                    })  
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                })  
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                .catch(() => {})  
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        },  
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        // #endif  
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        // 完成过渡后触发  
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        onTransitionEnd() {  
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            // 如果已经是结束的状态,无需再处理  
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            if (this.transitionEnded) return  
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            this.transitionEnded = true  
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            // 发出组件动画执行后的事件  
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            this.$emit(this.status === 'leave' ? 'afterLeave' : 'afterEnter')  
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            if (!this.show && this.display) {  
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                this.display = false  
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                this.inited = false  
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            }  
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        }  
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    }  
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}  
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