| // nvue操作dom的库,用于获取dom的尺寸信息 | 
| const dom = uni.requireNativePlugin('dom'); | 
| const bindingX = uni.requireNativePlugin('bindingx'); | 
| const animation = uni.requireNativePlugin('animation'); | 
|   | 
| export default { | 
|     data() { | 
|         return { | 
|             // 所有按钮的总宽度 | 
|             buttonsWidth: 0, | 
|             // 是否正在移动中 | 
|             moving: false | 
|         } | 
|     }, | 
|     computed: { | 
|         // 获取过渡时间 | 
|         getDuratin() { | 
|             let duration = String(this.duration) | 
|             // 如果ms为单位,返回ms的数值部分 | 
|             if (duration.indexOf('ms') >= 0) return parseInt(duration) | 
|             // 如果s为单位,为了得到ms的数值,需要乘以1000 | 
|             if (duration.indexOf('s') >= 0) return parseInt(duration) * 1000 | 
|             // 如果值传了数值,且小于30,认为是s单位 | 
|             duration = Number(duration) | 
|             return duration < 30 ? duration * 1000 : duration | 
|         } | 
|     }, | 
|     watch: { | 
|         show(n) { | 
|             if(n) { | 
|                 this.moveCellByAnimation('open')  | 
|             } else { | 
|                 this.moveCellByAnimation('close')  | 
|             } | 
|         } | 
|     }, | 
|     mounted() { | 
|         this.initialize() | 
|     }, | 
|     methods: { | 
|         initialize() { | 
|             this.queryRect()  | 
|         }, | 
|         // 关闭单元格,用于打开一个,自动关闭其他单元格的场景 | 
|         closeHandler() { | 
|             if(this.status === 'open') { | 
|                 // 如果在打开状态下,进行点击的话,直接关闭单元格 | 
|                 return this.moveCellByAnimation('close') && this.unbindBindingX() | 
|             } | 
|         }, | 
|         // 点击单元格 | 
|         clickHandler() { | 
|             // 如果在移动中被点击,进行忽略 | 
|             if(this.moving) return | 
|             // 尝试关闭其他打开的单元格 | 
|             this.parent && this.parent.closeOther(this) | 
|             if(this.status === 'open') { | 
|                 // 如果在打开状态下,进行点击的话,直接关闭单元格 | 
|                 return this.moveCellByAnimation('close') && this.unbindBindingX() | 
|             } | 
|         }, | 
|         // 滑动单元格 | 
|         onTouchstart(e) { | 
|             // 如果当前正在移动中,或者disabled状态,则返回 | 
|             if(this.moving || this.disabled) {  | 
|                 return this.unbindBindingX()    | 
|             } | 
|             if(this.status === 'open') { | 
|                 // 如果在打开状态下,进行点击的话,直接关闭单元格 | 
|                 return this.moveCellByAnimation('close') && this.unbindBindingX() | 
|             } | 
|             // 特殊情况下,e可能不为一个对象 | 
|             e?.stopPropagation && e.stopPropagation()  | 
|             e?.preventDefault && e.preventDefault() | 
|             this.moving = true | 
|             // 获取元素ref | 
|             const content = this.getContentRef() | 
|             let expression = `min(max(${-this.buttonsWidth}, x), 0)` | 
|             // 尝试关闭其他打开的单元格 | 
|             this.parent && this.parent.closeOther(this) | 
|              | 
|             // 阿里为了KPI而开源的BindingX | 
|             this.panEvent = bindingX.bind({ | 
|                 anchor: content, | 
|                 eventType: 'pan', | 
|                 props: [{ | 
|                     element: content, | 
|                     // 绑定width属性,设置其宽度值 | 
|                     property: 'transform.translateX', | 
|                     expression | 
|                 }] | 
|             }, (res) => { | 
|                 this.moving = false | 
|                 if (res.state === 'end' || res.state === 'exit') { | 
|                     const deltaX = res.deltaX | 
|                     if(deltaX <= -this.buttonsWidth || deltaX >= 0) { | 
|                         // 如果触摸滑动的过程中,大于单元格的总宽度,或者大于0,意味着已经动过滑动达到了打开或者关闭的状态 | 
|                         // 这里直接进行状态的标记 | 
|                         this.$nextTick(() => { | 
|                             this.status = deltaX <= -this.buttonsWidth ? 'open' : 'close' | 
|                         }) | 
|                     } else if(Math.abs(deltaX) > uni.$u.getPx(this.threshold)) { | 
|                         // 在移动大于阈值、并且小于总按钮宽度时,进行自动打开或者关闭 | 
|                         // 移动距离大于0时,意味着需要关闭状态 | 
|                         if(Math.abs(deltaX) < this.buttonsWidth) { | 
|                             this.moveCellByAnimation(deltaX > 0 ? 'close' : 'open') | 
|                         } | 
|                     } else { | 
|                         // 在小于阈值时,进行关闭操作(如果在打开状态下,将不会执行bindingX) | 
|                         this.moveCellByAnimation('close') | 
|                     } | 
|                 } | 
|             }) | 
|         }, | 
|         // 释放bindingX | 
|         unbindBindingX() { | 
|             // 释放上一次的资源 | 
|             if (this?.panEvent?.token != 0) { | 
|                 bindingX.unbind({ | 
|                     token: this.panEvent?.token, | 
|                     // pan为手势事件 | 
|                     eventType: 'pan' | 
|                 }) | 
|             } | 
|         }, | 
|         // 查询按钮节点信息 | 
|         queryRect() { | 
|             // 历遍所有按钮数组,通过getRectByDom返回一个promise | 
|             const promiseAll = this.options.map((item, index) => { | 
|                 return this.getRectByDom(this.$refs[`u-swipe-action-item__right__button-${index}`][0]) | 
|             }) | 
|             // 通过promise.all方法,让所有按钮的查询结果返回一个数组的形式 | 
|             Promise.all(promiseAll).then(sizes => { | 
|                 this.buttons = sizes | 
|                 // 计算所有按钮总宽度 | 
|                 this.buttonsWidth = sizes.reduce((sum, cur) => sum + cur.width, 0) | 
|             }) | 
|         }, | 
|         // 通过nvue的dom模块,查询节点信息 | 
|         getRectByDom(ref) { | 
|             return new Promise(resolve => { | 
|                 dom.getComponentRect(ref, res => { | 
|                     resolve(res.size) | 
|                 }) | 
|             })  | 
|         }, | 
|         // 移动单元格到左边或者右边尽头 | 
|         moveCellByAnimation(status = 'open') { | 
|             if(this.moving) return | 
|             // 标识当前状态 | 
|             this.moveing = true | 
|             const content = this.getContentRef() | 
|             const x = status === 'open' ? -this.buttonsWidth : 0  | 
|             animation.transition(content, { | 
|                 styles: { | 
|                     transform: `translateX(${x}px)`, | 
|                 }, | 
|                 duration: uni.$u.getDuration(this.duration, false), | 
|                 timingFunction: 'ease-in-out' | 
|             }, () => { | 
|                 this.moving = false | 
|                 this.status = status | 
|                 this.unbindBindingX() | 
|             }) | 
|         }, | 
|         // 获取元素ref | 
|         getContentRef() { | 
|             return this.$refs['u-swipe-action-item__content'].ref | 
|         }, | 
|         beforeDestroy() { | 
|             this.unbindBindingX() | 
|         } | 
|     } | 
| } |