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zhangwei
2024-08-22 d5eb1ecff5d0236359c744b334cf30fcfdad1132
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export default {
    data() {
        return {
            state: {
                moving: false,
                startX: 0,
                startY: 0,
                buttonsWidth: 0
            }
        }
    },
    watch: {
        status(newValue) {
            if (this.disabled) return
            // 打开或关闭单元格
            if (newValue === 'close' && this.status === 'open') {
                this.closeSwipeAction(instance, ownerInstance)
            } else if(newValue === 'open' && this.status === 'close') {
                this.openSwipeAction()
            }
        },
        options(newVal) {
            this.getBtnWidth()
        }
    },
    mounted() {
        this.getBtnWidth()
    },
    methods: {
        clickHandler() {
        },         setStatus(status) {             this.status = status         },
        getBtnWidth() {
            let view = uni.createSelectorQuery().in(this).select(".u-swipe-action-item__right");
            view.fields({
                size: true,
                scrollOffset: true
                }, data => {
                    this.state.buttonsWidth = data.width
                    // console.log("得到节点信息" + JSON.stringify(data));
            }).exec();
        },
        // 开始触摸
        touchstart(event) {
            // console.log(event)
            // 标识当前为滑动中状态
            this.state.moving = true
            // 记录触摸开始点的坐标值
            var touches = event.touches
            this.state.startX = touches[0].pageX
            this.state.startY = touches[0].pageY
            
            // todo关闭其它
            // this.$parent && this.$parent.closeOther(this)
        },
        touchmove(event) {
            // console.log(event)
            if (this.disabled || !this.state.moving) return
            var touches = event.touches
            var pageX = touches[0].pageX
            var pageY = touches[0].pageY
            var moveX = pageX - this.state.startX
            var moveY = pageY - this.state.startY
 
            // 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
            if (Math.abs(moveX) > Math.abs(moveY) || Math.abs(moveX) > this.threshold) {
                event.preventDefault && event.preventDefault()
                event.stopPropagation && event.stopPropagation()
            }
            // 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
            if (Math.abs(moveX) < Math.abs(moveY)) return
 
            // 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
            // 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
            // 在超出后,设置为0
            if (this.status === 'open') {
                // 在开启状态下,向左滑动,需忽略
                if (moveX < 0) moveX = 0
                // 想要收起菜单,最大能移动的距离为按钮的总宽度
                if (moveX > this.state.buttonsWidth) moveX = this.state.buttonsWidth
                // 如果是已经打开了的状态,向左滑动时,移动收起菜单
                this.moveSwipeAction(-this.state.buttonsWidth + moveX)
            } else {
                // 关闭状态下,右滑动需忽略
                if (moveX > 0) moveX = 0
                // 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
                if (Math.abs(moveX) > this.state.buttonsWidth) moveX = -this.state.buttonsWidth
                // 只要是在滑过程中,就不断移动单元格内容部分,从而使隐藏的菜单显示出来
                this.moveSwipeAction(moveX)
            }
        },
        touchend(event) {
            // console.log(event)
            if (!this.state.moving || this.disabled) return
            this.state.moving = false
            var touches = event.changedTouches ? event.changedTouches[0] : {}
            var pageX = touches.pageX
            var pageY = touches.pageY
            var moveX = pageX - this.state.startX
            if (this.status === 'open') {
                // 在展开的状态下,继续左滑,无需操作
                if (moveX < 0) return
                // 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
                if (moveX === 0) {
                    return this.closeSwipeAction()
                }
                // 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
                if (Math.abs(moveX) < this.threshold) {
                    this.openSwipeAction()
                } else {
                    // 如果滑动距离大于阈值,则执行收起逻辑
                    this.closeSwipeAction()
                }
            } else {
                // 在关闭的状态下,右滑,无需操作
                if (moveX > 0) return
                // 理由同上
                if (Math.abs(moveX) < this.threshold) {
                    this.closeSwipeAction()
                } else {
                    this.openSwipeAction()
                }
            }
        },
        // 一次性展开滑动菜单
        openSwipeAction() {
            // 处理duration单位问题
            var duration = this.getDuration(this.duration)
            // 展开过程中,是向左移动,所以X的偏移应该为负值
            var buttonsWidth = -this.state.buttonsWidth
            this.sliderStyle = {
                'transition': 'transform ' + duration,
                'transform': 'translateX(' + buttonsWidth + 'px)',
                '-webkit-transform': 'translateX(' + buttonsWidth + 'px)',
            }
            this.setStatus('open')
        },
        // 一次性收起滑动菜单
        closeSwipeAction() {
            // 处理duration单位问题
            var duration = this.getDuration(this.duration)
            this.sliderStyle = {
                'transition': 'transform ' + duration,
                'transform': 'translateX(0px)',
                '-webkit-transform': 'translateX(0px)'
            }
            // 设置各个隐藏的按钮为收起的状态
            // for (var i = this.state.buttonsWidth - 1; i >= 0; i--) {
            //     buttons[i].setStyle({
            //         'transition': 'transform ' + duration,
            //         'transform': 'translateX(0px)',
            //         '-webkit-transform': 'translateX(0px)'
            //     })
            // }
            this.setStatus('close')
        },
        // 移动滑动选择器内容区域,同时显示出其隐藏的菜单
        moveSwipeAction(moveX) {
            // 设置菜单内容部分的偏移
            this.sliderStyle = {
                'transition': 'none',
                transform: 'translateX(' + moveX + 'px)',
                '-webkit-transform': 'translateX(' + moveX + 'px)'
            }
        },
        // 获取过渡时间
        getDuration(value) {
            if (value.toString().indexOf('s') >= 0) return value
            return value > 30 ? value + 'ms' : value + 's'
        }
    }
}