<template> 
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    <view class=""> 
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        <movable-area class="u-swipe-action" :style="{ backgroundColor: bgColor }"> 
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            <movable-view 
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                class="u-swipe-view" 
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                @change="change" 
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                @touchend="touchend" 
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                @touchstart="touchstart" 
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                direction="horizontal" 
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                :disabled="disabled" 
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                :x="moveX" 
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                :style="{ 
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                    width: movableViewWidth ? movableViewWidth : '100%' 
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                }" 
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            > 
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                <view 
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                    class="u-swipe-content" 
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                    @tap.stop="contentClick" 
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                > 
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                    <slot></slot> 
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                </view> 
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                <view class="u-swipe-del" v-if="showBtn" @tap.stop="btnClick(index)" :style="[btnStyle(item.style)]" v-for="(item, index) in options" :key="index"> 
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                    <view class="u-btn-text">{{ item.text }}</view> 
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                </view> 
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            </movable-view> 
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        </movable-area> 
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    </view> 
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</template> 
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<script> 
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/** 
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 * swipeAction 左滑单元格 
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 * @description 该组件一般用于左滑唤出操作菜单的场景,用的最多的是左滑删除操作。 
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 * @tutorial https://www.uviewui.com/components/swipeAction.html 
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 * @property {String} bg-color 整个组件背景颜色(默认#ffffff) 
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 * @property {Array} options 数组形式,可以配置背景颜色和文字 
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 * @property {String Number} index 标识符,点击时候用于区分点击了哪一个,用v-for循环时的index即可 
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 * @property {String Number} btn-width 按钮宽度,单位rpx(默认180) 
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 * @property {Boolean} disabled 是否禁止某个swipeAction滑动(默认false) 
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 * @property {Boolean} show 打开或者关闭某个组件(默认false) 
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 * @event {Function} click 点击组件时触发 
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 * @event {Function} close 组件触发关闭状态时 
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 * @event {Function} content-click 点击内容时触发 
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 * @event {Function} open 组件触发打开状态时 
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 * @example <u-swipe-action btn-text="收藏">...</u-swipe-action> 
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 */ 
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export default { 
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    name: 'u-swipe-action', 
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    props: { 
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        // index值,用于得知点击删除的是哪个按钮 
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        index: { 
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            type: [Number, String], 
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            default: '' 
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        }, 
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        // 滑动按钮的宽度,单位为rpx 
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        btnWidth: { 
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            type: [String, Number], 
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            default: 180 
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        }, 
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        // 是否禁止某个action滑动 
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        disabled: { 
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            type: Boolean, 
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            default: false 
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        }, 
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        // 打开或者关闭组件 
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        show: { 
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            type: Boolean, 
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            default: false 
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        }, 
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        // 组件背景颜色 
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        bgColor: { 
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            type: String, 
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            default: '#ffffff' 
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        }, 
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        // 是否使手机发生短促震动,目前只在iOS的微信小程序有效(2020-05-06) 
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        vibrateShort: { 
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            type: Boolean, 
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            default: false 
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        }, 
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        // 按钮操作参数 
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        options: { 
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            type: Array, 
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            default() { 
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                return []; 
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            } 
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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(nVal, oVal) { 
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                if (nVal) { 
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                    this.open(); 
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                } else { 
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                    this.close(); 
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                } 
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            } 
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        } 
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    }, 
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    data() { 
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        return { 
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            moveX: 0, // movable-view元素在x轴上需要移动的目标移动距离,用于展开或收起滑动的按钮 
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            scrollX: 0, // movable-view移动过程中产生的change事件中的x轴移动值 
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            status: false, // 滑动的状态,表示当前是展开还是关闭按钮的状态 
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            movableAreaWidth: 0, // 滑动区域 
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            elId: this.$u.guid(), // id,用于通知另外组件关闭时的识别 
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            showBtn: false, // 刚开始渲染视图时不显示右边的按钮,避免视图闪动 
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        }; 
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    }, 
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    computed: { 
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        movableViewWidth() { 
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            return this.movableAreaWidth + this.allBtnWidth + 'px'; 
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        }, 
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        innerBtnWidth() { 
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            return uni.upx2px(this.btnWidth); 
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        }, 
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        allBtnWidth() { 
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            return uni.upx2px(this.btnWidth) * this.options.length; 
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        }, 
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        btnStyle() { 
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            return style => { 
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                let css = {}; 
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                style.width = this.btnWidth + 'rpx'; 
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                return style; 
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            }; 
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        } 
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    }, 
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    mounted() { 
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        this.getActionRect(); 
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    }, 
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    methods: { 
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        // 点击按钮 
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        btnClick(index) { 
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            this.status = false; 
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            // this.index为点击的几个组件,index为点击某个组件的第几个按钮(options数组的索引) 
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            this.$emit('click', this.index, index); 
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        }, 
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        // movable-view元素移动事件 
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        change(e) { 
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            this.scrollX = e.detail.x; 
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        }, 
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        // 关闭按钮状态 
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        close() { 
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            this.moveX = 0; 
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            this.status = false; 
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        }, 
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        // 打开按钮的状态 
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        open() { 
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            if (this.disabled) return; 
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            this.moveX = -this.allBtnWidth; 
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            this.status = true; 
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        }, 
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        // 用户手指离开movable-view元素,停止触摸 
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        touchend() { 
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            this.moveX = this.scrollX; 
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            // 停止触摸时候,判断当前是展开还是关闭状态 
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            // 关闭状态 
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            // 这一步很重要,需要先给this.moveX一个变化的随机值,否则因为前后设置的为同一个值 
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            // props单向数据流的原因,导致movable-view元素不会发生变化,切记,详见文档: 
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            // https://uniapp.dcloud.io/use?id=%e5%b8%b8%e8%a7%81%e9%97%ae%e9%a2%98 
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            this.$nextTick(function() { 
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                if (this.status == false) { 
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                    // 关闭状态左滑,产生的x轴位移为负值,也就是说滑动的距离大于按钮的四分之一宽度,自动展开按钮 
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                    if (this.scrollX <= -this.allBtnWidth / 4) { 
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                        this.moveX = -this.allBtnWidth; // 按钮宽度的负值,即为展开状态movable-view元素左滑的距离 
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                        this.status = true; // 标志当前为展开状态 
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                        this.emitOpenEvent(); 
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                        // 产生震动效果 
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                        if (this.vibrateShort) uni.vibrateShort(); 
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                    } else { 
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                        this.moveX = 0; // 如果距离没有按钮宽度的四分之一,自动收起 
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                        this.status = false; 
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                        this.emitCloseEvent(); 
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                    } 
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                } else { 
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                    // 如果在打开的状态下,右滑动的距离X轴偏移超过按钮的四分之一(负值反过来的四分之三),自动收起按钮 
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                    if (this.scrollX > (-this.allBtnWidth * 3) / 4) { 
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                        this.moveX = 0; 
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                        this.$nextTick(() => { 
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                            this.moveX = 101; 
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                        }); 
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                        this.status = false; 
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                        this.emitCloseEvent(); 
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                    } else { 
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                        this.moveX = -this.allBtnWidth; 
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                        this.status = true; 
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                        this.emitOpenEvent(); 
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                    } 
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                } 
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            }); 
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        }, 
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        emitOpenEvent() { 
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            this.$emit('open', this.index); 
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        }, 
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        emitCloseEvent() { 
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            this.$emit('close', this.index); 
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        }, 
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        // 开始触摸 
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        touchstart() {}, 
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        getActionRect() { 
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            this.$uGetRect('.u-swipe-action').then(res => { 
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                this.movableAreaWidth = res.width; 
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                // 等视图更新完后,再显示右边的可滑动按钮,防止这些按钮会"闪一下" 
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                this.$nextTick(() => { 
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                    this.showBtn = true; 
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                }) 
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            }); 
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        }, 
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        // 点击内容触发事件 
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        contentClick() { 
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            // 点击内容时,如果当前为打开状态,收起组件 
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            if (this.status == true) { 
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                this.status = 'close'; 
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                this.moveX = 0; 
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            } 
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            this.$emit('content-click', this.index); 
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        } 
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    } 
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}; 
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</script> 
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<style scoped lang="scss"> 
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@import "../../libs/css/style.components.scss"; 
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.u-swipe-action { 
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    width: auto; 
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    height: initial; 
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    position: relative; 
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    overflow: hidden; 
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} 
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.u-swipe-view { 
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    @include vue-flex; 
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    height: initial; 
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    position: relative; 
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    /* 这一句很关键,覆盖默认的绝对定位 */ 
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} 
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.u-swipe-content { 
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    flex: 1; 
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} 
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.u-swipe-del { 
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    position: relative; 
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    font-size: 30rpx; 
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    color: #ffffff; 
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} 
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.u-btn-text { 
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    position: absolute; 
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    top: 50%; 
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    left: 50%; 
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    transform: translate(-50%, -50%); 
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} 
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</style> 
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