// nvue操作dom的库,用于获取dom的尺寸信息 
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const dom = uni.requireNativePlugin('dom') 
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// nvue中用于操作元素动画的库,类似于uni.animation,只不过uni.animation不能用于nvue 
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const animation = uni.requireNativePlugin('animation') 
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export default { 
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    data() { 
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        return { 
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            // 是否滑动中 
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            moving: false, 
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            // 状态,open-打开状态,close-关闭状态 
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            status: 'close', 
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            // 开始触摸点的X和Y轴坐标 
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            startX: 0, 
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            startY: 0, 
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            // 所有隐藏按钮的尺寸信息数组 
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            buttons: [], 
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            // 所有按钮的总宽度 
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            buttonsWidth: 0, 
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            // 记录上一次移动的位置值 
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            moveX: 0, 
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            // 记录上一次滑动的位置,用于前后两次做对比,如果移动的距离小于某一阈值,则认为前后之间没有移动,为了解决可能存在的通信阻塞问题 
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            lastX: 0 
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        } 
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    }, 
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    computed: { 
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        // 获取过渡时间 
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        getDuratin() { 
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            let duration = String(this.duration) 
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            // 如果ms为单位,返回ms的数值部分 
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            if (duration.indexOf('ms') >= 0) return parseInt(duration) 
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            // 如果s为单位,为了得到ms的数值,需要乘以1000 
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            if (duration.indexOf('s') >= 0) return parseInt(duration) * 1000 
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            // 如果值传了数值,且小于30,认为是s单位 
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            duration = Number(duration) 
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            return duration < 30 ? duration * 1000 : duration 
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        } 
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    }, 
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    watch: { 
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        show: { 
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            immediate: true, 
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            handler(n) { 
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                // if(n === true) { 
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                //     uni.$u.sleep(50).then(() => { 
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                //         this.openSwipeAction() 
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                //     }) 
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                // } else { 
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                //     this.closeSwipeAction() 
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                // } 
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            } 
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        } 
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    }, 
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    mounted() { 
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        uni.$u.sleep(20).then(() => { 
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            this.queryRect() 
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        }) 
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    }, 
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    methods: { 
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        close() { 
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            this.closeSwipeAction() 
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        }, 
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        // 触摸单元格 
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        touchstart(event) { 
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            if (this.disabled) return 
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            this.closeOther() 
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            const { touches } = event 
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            // 记录触摸开始点的坐标值 
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            this.startX = touches[0].pageX 
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            this.startY = touches[0].pageY 
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        }, 
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        // // 触摸滑动 
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        touchmove(event) { 
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            if (this.disabled) return 
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            const { touches } = event 
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            const { pageX } = touches[0] 
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            const { pageY } = touches[0] 
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            let moveX = pageX - this.startX 
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            const moveY = pageY - this.startY 
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            const { buttonsWidth } = this 
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            const len = this.buttons.length 
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            // 判断前后两次的移动距离,如果小于一定值,则不进行移动处理 
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            if (Math.abs(pageX - this.lastX) < 0.3) return 
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            this.lastX = pageX 
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            // 移动的X轴距离大于Y轴距离,也即终点与起点位置连线,与X轴夹角小于45度时,禁止页面滚动 
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            if (Math.abs(moveX) > Math.abs(moveY) || Math.abs(moveX) > this.threshold) { 
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                event.stopPropagation() 
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            } 
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            // 如果移动的X轴距离小于Y轴距离,也即终点位置与起点位置连线,与Y轴夹角小于45度时,认为是页面上下滑动,而不是左右滑动单元格 
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            if (Math.abs(moveX) < Math.abs(moveY)) return 
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            // 限制右滑的距离,不允许内容部分往右偏移,右滑会导致X轴偏移值大于0,以此做判断 
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            // 此处不能直接return,因为滑动过程中会缺失某些关键点坐标,会导致错乱,最好的办法就是 
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            // 在超出后,设置为0 
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            if (this.status === 'open') { 
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                // 在开启状态下,向左滑动,需忽略 
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                if (moveX < 0) moveX = 0 
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                // 想要收起菜单,最大能移动的距离为按钮的总宽度 
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                if (moveX > buttonsWidth) moveX = buttonsWidth 
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                // 如果是已经打开了的状态,向左滑动时,移动收起菜单 
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                this.moveSwipeAction(-buttonsWidth + moveX) 
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            } else { 
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                // 关闭状态下,右滑动需忽略 
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                if (moveX > 0) moveX = 0 
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                // 滑动的距离不允许超过所有按钮的总宽度,此时只能是左滑,最终设置按钮的总宽度,同时为负数 
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                if (Math.abs(moveX) > buttonsWidth) moveX = -buttonsWidth 
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                // 只要是在滑过程中,就不断移动菜单的内容部分,从而使隐藏的菜单显示出来 
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                this.moveSwipeAction(moveX) 
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            } 
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        }, 
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        // 单元格结束触摸 
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        touchend(event) { 
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            if (this.disabled) return 
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            const touches = event.changedTouches ? event.changedTouches[0] : {} 
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            const { pageX } = touches 
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            const { pageY } = touches 
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            const { buttonsWidth } = this 
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            this.moveX = pageX - this.startX 
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            if (this.status === 'open') { 
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                // 在展开的状态下,继续左滑,无需操作 
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                if (this.moveX < 0) this.moveX = 0 
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                if (this.moveX > buttonsWidth) this.moveX = buttonsWidth 
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                // 在开启状态下,点击一下内容区域,moveX为0,也即没有进行移动,这时执行收起菜单逻辑 
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                if (this.moveX === 0) { 
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                    return this.closeSwipeAction() 
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                } 
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                // 在开启状态下,滑动距离小于阈值,则默认为不关闭,同时恢复原来的打开状态 
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                if (Math.abs(this.moveX) < this.threshold) { 
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                    this.openSwipeAction() 
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                } else { 
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                    // 如果滑动距离大于阈值,则执行收起逻辑 
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                    this.closeSwipeAction() 
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                } 
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            } else { 
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                // 在关闭的状态下,右滑,无需操作 
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                if (this.moveX >= 0) this.moveX = 0 
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                if (this.moveX <= -buttonsWidth) this.moveX = -buttonsWidth 
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                // 理由同上 
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                if (Math.abs(this.moveX) < this.threshold) { 
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                    this.closeSwipeAction() 
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                } else { 
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                    this.openSwipeAction() 
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                } 
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            } 
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        }, 
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        // 移动滑动选择器内容区域,同时显示出其隐藏的菜单 
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        moveSwipeAction(moveX) { 
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            if (this.moving) return 
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            this.moving = true 
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            let previewButtonsMoveX = 0 
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            const len = this.buttons.length 
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            animation.transition(this.$refs['u-swipe-action-item__content'].ref, { 
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                styles: { 
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                    transform: `translateX(${moveX}px)` 
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                }, 
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                timingFunction: 'linear' 
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            }, () => { 
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                this.moving = false 
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            }) 
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            // 按钮的组的长度 
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            for (let i = len - 1; i >= 0; i--) { 
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                const buttonRef = this.$refs[`u-swipe-action-item__right__button-${i}`][0].ref 
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                // 通过比例,得出元素自身该移动的距离 
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                const translateX = this.buttons[i].width / this.buttonsWidth * moveX 
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                // 最终移动的距离,是通过自身比例算出的距离,再加上在它之前所有按钮移动的距离之和 
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                const realTranslateX = translateX + previewButtonsMoveX 
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                animation.transition(buttonRef, { 
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                    styles: { 
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                        transform: `translateX(${realTranslateX}px)` 
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                    }, 
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                    duration: 0, 
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                    delay: 0, 
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                    timingFunction: 'linear' 
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                }, () => {}) 
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                // 记录本按钮之前的所有按钮的移动距离之和 
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                previewButtonsMoveX += translateX 
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            } 
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        }, 
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        // 关闭菜单 
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        closeSwipeAction() { 
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            if (this.status === 'close') return 
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            this.moving = true 
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            const { buttonsWidth } = this 
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            animation.transition(this.$refs['u-swipe-action-item__content'].ref, { 
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                styles: { 
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                    transform: 'translateX(0px)' 
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                }, 
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                duration: this.getDuratin, 
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                timingFunction: 'ease-in-out' 
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            }, () => { 
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                this.status = 'close' 
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                this.moving = false 
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                this.closeHandler() 
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            }) 
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            // 按钮的组的长度 
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            const len = this.buttons.length 
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            for (let i = len - 1; i >= 0; i--) { 
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                const buttonRef = this.$refs[`u-swipe-action-item__right__button-${i}`][0].ref 
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                // 如果不满足边界条件,返回 
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                if (this.buttons.length === 0 || !this.buttons[i] || !this.buttons[i].width) return 
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                animation.transition(buttonRef, { 
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                    styles: { 
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                        transform: 'translateX(0px)' 
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                    }, 
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                    duration: this.getDuratin, 
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                    timingFunction: 'ease-in-out' 
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                }, () => {}) 
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            } 
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        }, 
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        // 打开菜单 
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        openSwipeAction() { 
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            if (this.status === 'open') return 
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            this.moving = true 
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            const buttonsWidth = -this.buttonsWidth 
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            let previewButtonsMoveX = 0 
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            animation.transition(this.$refs['u-swipe-action-item__content'].ref, { 
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                styles: { 
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                    transform: `translateX(${buttonsWidth}px)` 
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                }, 
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                duration: this.getDuratin, 
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                timingFunction: 'ease-in-out' 
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            }, () => { 
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                this.status = 'open' 
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                this.moving = false 
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                this.openHandler() 
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            }) 
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            // 按钮的组的长度 
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            const len = this.buttons.length 
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            for (let i = len - 1; i >= 0; i--) { 
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                const buttonRef = this.$refs[`u-swipe-action-item__right__button-${i}`][0].ref 
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                // 如果不满足边界条件,返回 
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                if (this.buttons.length === 0 || !this.buttons[i] || !this.buttons[i].width) return 
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                // 通过比例,得出元素自身该移动的距离 
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                const translateX = this.buttons[i].width / this.buttonsWidth * buttonsWidth 
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                // 最终移动的距离,是通过自身比例算出的距离,再加上在它之前所有按钮移动的距离之和 
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                const realTranslateX = translateX + previewButtonsMoveX 
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                animation.transition(buttonRef, { 
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                    styles: { 
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                        transform: `translateX(${realTranslateX}px)` 
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                    }, 
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                    duration: this.getDuratin, 
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                    timingFunction: 'ease-in-out' 
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                }, () => {}) 
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                previewButtonsMoveX += translateX 
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            } 
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        }, 
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        // 查询按钮节点信息 
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        queryRect() { 
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            // 历遍所有按钮数组,通过getRectByDom返回一个promise 
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            const promiseAll = this.rightOptions.map((item, index) => this.getRectByDom(this.$refs[`u-swipe-action-item__right__button-${index}`][0])) 
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            // 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 
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            Promise.all(promiseAll).then((sizes) => { 
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                this.buttons = sizes 
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                // 计算所有按钮总宽度 
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                this.buttonsWidth = sizes.reduce((sum, cur) => sum + cur.width, 0) 
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            }) 
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        }, 
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        // 通过nvue的dom模块,查询节点信息 
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        getRectByDom(ref) { 
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            return new Promise((resolve) => { 
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                dom.getComponentRect(ref, (res) => { 
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                    resolve(res.size) 
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                }) 
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            }) 
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        } 
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    } 
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} 
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