| // 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 | 
| const nextTick = () => new Promise(resolve => setTimeout(resolve, 1000 / 50)) | 
| // nvue动画模块实现细节抽离在外部文件 | 
| import animationMap from './nvue.ani-map.js' | 
|   | 
| // #ifndef APP-NVUE | 
| // 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 | 
| const getClassNames = (name) => ({ | 
|     enter: `u-${name}-enter u-${name}-enter-active`, | 
|     'enter-to': `u-${name}-enter-to u-${name}-enter-active`, | 
|     leave: `u-${name}-leave u-${name}-leave-active`, | 
|     'leave-to': `u-${name}-leave-to u-${name}-leave-active` | 
| }) | 
| // #endif | 
|   | 
| // #ifdef APP-NVUE | 
| // 引入nvue(weex)的animation动画模块,文档见: | 
| // https://weex.apache.org/zh/docs/modules/animation.html#transition | 
| const animation = uni.requireNativePlugin('animation') | 
| const getStyle = (name) => animationMap[name] | 
| // #endif | 
|   | 
| export default { | 
|     methods: { | 
|         // 组件被点击发出事件 | 
|         clickHandler() { | 
|             this.$emit('click') | 
|         }, | 
|         // #ifndef APP-NVUE | 
|         // vue版本的组件进场处理 | 
|          vueEnter() { | 
|             // 动画进入时的类名 | 
|             const classNames = getClassNames(this.mode) | 
|             // 定义状态和发出动画进入前事件 | 
|             this.status = 'enter' | 
|             this.$emit('beforeEnter') | 
|             this.inited = true | 
|             this.display = true | 
|             this.classes = classNames.enter | 
|             this.$nextTick(async () => { | 
|                 // #ifdef H5 | 
|                 await uni.$u.sleep(20) | 
|                 // #endif | 
|                 // 标识动画尚未结束 | 
|                 this.$emit('enter') | 
|                 this.transitionEnded = false | 
|                 // 组件动画进入后触发的事件 | 
|                 this.$emit('afterEnter') | 
|                 // 赋予组件enter-to类名 | 
|                 this.classes = classNames['enter-to'] | 
|             }) | 
|         }, | 
|         // 动画离场处理 | 
|         vueLeave() { | 
|             // 如果不是展示状态,无需执行逻辑 | 
|             if (!this.display) return | 
|             const classNames = getClassNames(this.mode) | 
|             // 标记离开状态和发出事件 | 
|             this.status = 'leave' | 
|             this.$emit('beforeLeave') | 
|             // 获得类名 | 
|             this.classes = classNames.leave | 
|   | 
|             this.$nextTick(() => { | 
|                // 动画正在离场的状态 | 
|                this.transitionEnded = false | 
|                this.$emit('leave') | 
|                 // 组件执行动画,到了执行的执行时间后,执行一些额外处理 | 
|                 setTimeout(this.onTransitionEnd, this.duration) | 
|                 this.classes = classNames['leave-to'] | 
|             }) | 
|         }, | 
|         // #endif | 
|         // #ifdef APP-NVUE | 
|         // nvue版本动画进场 | 
|         nvueEnter() { | 
|             // 获得样式的名称 | 
|             const currentStyle = getStyle(this.mode) | 
|             // 组件动画状态和发出事件 | 
|             this.status = 'enter' | 
|             this.$emit('beforeEnter') | 
|             // 展示生成组件元素 | 
|             this.inited = true | 
|             this.display = true | 
|             // 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 | 
|             // 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 | 
|             this.viewStyle = { | 
|                 opacity: 0 | 
|             } | 
|             // 等待弹窗内容渲染完成 | 
|             this.$nextTick(() => { | 
|                 // 合并样式 | 
|                 this.viewStyle = currentStyle.enter | 
|                 Promise.resolve() | 
|                     .then(nextTick) | 
|                     .then(() => { | 
|                         // 组件开始进入前的事件 | 
|                         this.$emit('enter') | 
|                         // 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.$refs['u-transition']用法 | 
|                         animation.transition(this.$refs['u-transition'].ref, { | 
|                             styles: currentStyle['enter-to'], | 
|                             duration: this.duration, | 
|                             timingFunction: this.timingFunction, | 
|                             needLayout: false, | 
|                             delay: 0 | 
|                         }, () => { | 
|                             // 动画执行完毕,发出事件 | 
|                             this.$emit('afterEnter') | 
|                         }) | 
|                     }) | 
|                     .catch(() => {}) | 
|             }) | 
|         }, | 
|         nvueLeave() { | 
|             if (!this.display) { | 
|                 return | 
|             } | 
|             const currentStyle = getStyle(this.mode) | 
|             // 定义状态和事件 | 
|             this.status = 'leave' | 
|             this.$emit('beforeLeave') | 
|             // 合并样式 | 
|             this.viewStyle = currentStyle.leave | 
|             // 放到promise中处理执行过程 | 
|             Promise.resolve() | 
|                 .then(nextTick) // 等待几十ms | 
|                 .then(() => { | 
|                     this.transitionEnded = false | 
|                     // 动画正在离场的状态 | 
|                     this.$emit('leave') | 
|                     animation.transition(this.$refs['u-transition'].ref, { | 
|                         styles: currentStyle['leave-to'], | 
|                         duration: this.duration, | 
|                         timingFunction: this.timingFunction, | 
|                         needLayout: false, | 
|                         delay: 0 | 
|                     }, () => { | 
|                         this.onTransitionEnd() | 
|                     }) | 
|                 }) | 
|                 .catch(() => {}) | 
|         }, | 
|         // #endif | 
|         // 完成过渡后触发 | 
|         onTransitionEnd() { | 
|             // 如果已经是结束的状态,无需再处理 | 
|             if (this.transitionEnded) return | 
|             this.transitionEnded = true | 
|             // 发出组件动画执行后的事件 | 
|             this.$emit(this.status === 'leave' ? 'afterLeave' : 'afterEnter') | 
|             if (!this.show && this.display) { | 
|                 this.display = false | 
|                 this.inited = false | 
|             } | 
|         } | 
|     } | 
| } |