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506 lines
13 KiB
506 lines
13 KiB
<template>
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<view>
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<view class="upload-images" :style="{'overflow-x': overOnePage ? 'hidden' : 'initial'}">
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<!-- 上传按钮 TODO 应该移到和图片同一列 -->
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<view class="upload-image-item"
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:style="{order: uploadButton == 'front' ? '1' : '2', height: '222rpx', 'margin-bottom': '6px'}"
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@click="uploadImage"
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v-if="(count == -1) || (image_list.length < count)">
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<text class="lf-iconfont lf-icon-jia upload-image-item-after"></text>
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</view>
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<!-- 图片列表 -->
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<view class="item-wrap" :style="{'height': itemWrapHeight +'px', order: uploadButton == 'front' ? '2' : '1'}">
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<view class="item"
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:class="{'cur': cur == index, 'zIndex': curZ == index, 'itemTransition': itemTransition}"
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v-for="(item, index) in list"
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:key="index"
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:id="'item'+index"
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:data-key="item.key"
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:data-index="index"
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:style="[itemStyle(index, item)]"
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@longpress="longPress"
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@touchmove.stop="touchMove"
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@touchend.stop="touchEnd">
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<view class="info">
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<view class="upload-image-item" @click="lookImage(index)">
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<image :src="item.data" mode="aspectFill"></image>
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<view class="remove-image" @click.stop="removeInage(index)" v-if="showDelete">
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<text class="lf-iconfont lf-icon-shanchu"></text>
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</view>
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</view>
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</view>
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</view>
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</view>
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</view>
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<view v-if="overOnePage" class="indicator">
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<view>滑动此区域滚动页面</view>
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</view>
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</view>
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</template>
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<script>
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export default {
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props: {
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uploadButton: {
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type: String, // 上传按钮显示在哪里，front图片前面，behind图片后面
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default: 'front'
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},
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showDelete: {
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type: Boolean, // 是否可删除图片
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default: true
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},
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count: {
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type: Number, // 可上传多少张图, 默认6张
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default: 6
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},
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size: {
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type: Number, // 限制单张图上传大小，单位M
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default: 10
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},
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drag: {
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type: Boolean,
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default: false
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},
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padding: {
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type: Number, // 图片与图片之间的间距，默认5像素，单位px
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default: 6
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},
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width: {
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type: String, // 每张图片的宽度，支持百分比，像素，bisection表示等分
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default: 'bisection'
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},
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height: {
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type: String, // 每张图片高度
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default: '222rpx'
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}
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},
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data(){
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return {
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touch: false,
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startX: 0,
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startY: 0,
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columns: 3,
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item: {},
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tranX: 0,
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tranConstX: 0,
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itemWrap: {},
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tranY: 0,
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teanConstY: 0,
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overOnePage: false,
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windowHeight: 0,
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originKey: null,
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list: [],
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cur: -1,
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curZ: -1,
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image_list: [],
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itemWrapHeight: 0
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}
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},
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computed: {
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itemStyle(){
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let that = this;
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return function(index, item){
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let style_obj = {
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height: that.$props.height
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}
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let width = that.$props.width;
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if(width == 'bisection'){
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width = `calc(${100 / that.columns +'%'} - 4px)`
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}
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style_obj.width = width;
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let str = 'translate3d(';
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if(index === that.cur){
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str += that.tranX +'px';
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str += ', ';
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str += that.tranY +'px';
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}else{
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str += item.tranX +'px';
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str += ', ';
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str += item.tranY +'px';
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}
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str += ', 0px)';
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style_obj.transform = str;
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return style_obj;
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}
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}
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},
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mounted(){
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// 'https://picsum.photos/200',
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// 'https://picsum.photos/200/300'
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this.init();
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},
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methods: {
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// 上传凭证图片
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uploadImage(){
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let current_count = this.$props.count - this.image_list.length;
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if(this.$props.count == -1){
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current_count = 9;
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}
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if(current_count == 0) return;
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uni.chooseImage({
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count: current_count,
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complete: result => {
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if(result.errMsg == "chooseImage:fail cancel"){
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return; // 取消选择图片
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}
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let tempFiles = result.tempFiles;
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let image_list = [];
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let overstep = false;
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tempFiles.map(item => {
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// 上传的图片大小
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let size = Math.floor((Number(this.$props.size) || 1) * 1024 * 1024);
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if(item.size < size){
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image_list.push(item.path);
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}else{
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overstep = true;
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}
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})
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this.image_list.push(...image_list);
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if(overstep){
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uni.showModal({
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title: '温馨提示',
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content: '您上传的图片含有超出10M大小的限制，请优化大小后再上传！',
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showCancel: false
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})
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}else{
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this.init(); // TODO 优化每次上传都会造成重新初始化导致闪烁
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}
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}
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})
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},
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// 预览图片
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lookImage(current){
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if(this.image_list.length <= 0) return;
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this.$u.throttle(() => {
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uni.previewImage({
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urls: this.image_list,
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current: current
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});
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}, 500);
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},
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// 移除图片
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removeInage(current){
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// 移除已上传的图片
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this.image_list.splice(current, 1);
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// 移除定位的元素(重新初始化)
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let list = this.image_list.map((item, index) => {
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return {
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key: index,
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tranX: 0,
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tranY: 0,
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data: item
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}
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}) || [];
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this.list = list;
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this.getPosition(list, false); // 重新定位
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// 重新计算大盒子高度
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let rows = Math.ceil(list.length / this.columns);
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let itemWrapHeight = rows * this.item.height;
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itemWrapHeight += rows * this.$props.padding - this.$props.padding;
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this.itemWrapHeight = itemWrapHeight;
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},
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// 返回已上传的图片列表
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getUploadImage(){
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return this.image_list;
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},
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// 长按触发移动排序
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longPress(e) {
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this.touch = true;
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this.startX = e.changedTouches[0].pageX
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this.startY = e.changedTouches[0].pageY
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let index = e.currentTarget.dataset.index;
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if(this.columns === 1) { // 单列时候X轴初始不做位移
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this.tranConstX = 0;
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} else { // 多列的时候计算X轴初始位移, 使 item 水平中心移动到点击处
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this.tranConstX = this.startX - this.item.width / 2 - this.itemWrap.left;
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}
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// 计算Y轴初始位移, 使 item 垂直中心移动到点击处
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this.teanConstY = this.startY - this.item.height / 2 - this.itemWrap.top;
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this.tranY = this.teanConstY;
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this.tranX = this.tranConstX;
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this.cur = index;
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this.curZ = index;
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// #ifndef H5
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uni.vibrateShort();
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// #endif
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},
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// 拖拽中
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touchMove(e) {
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if (!this.touch) return;
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let tranX = e.touches[0].pageX - this.startX + this.tranConstX;
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let tranY = e.touches[0].pageY - this.startY + this.teanConstY;
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let overOnePage = this.overOnePage;
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// 判断是否超过一屏幕, 超过则需要判断当前位置动态滚动page的位置
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if(overOnePage) {
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if(e.touches[0].clientY > this.windowHeight - this.item.height) {
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uni.pageScrollTo({
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scrollTop: e.touches[0].pageY + this.item.height - this.windowHeight,
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duration: 300
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});
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} else if(e.touches[0].clientY < this.item.height) {
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uni.pageScrollTo({
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scrollTop: e.touches[0].pageY - this.item.height,
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duration: 300
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});
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}
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}
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this.tranX = tranX;
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this.tranY = tranY;
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let originKey = e.currentTarget.dataset.key;
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let endKey = this.calculateMoving(tranX, tranY);
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// 防止拖拽过程中发生乱序问题
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if (originKey == endKey || this.originKey == originKey) return;
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this.originKey = originKey;
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this.insert(originKey, endKey);
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},
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// 根据当前的手指偏移量计算目标key
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calculateMoving(tranX, tranY) {
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let rows = Math.ceil(this.list.length / this.columns) - 1;
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let i = Math.round(tranX / this.item.width);
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let j = Math.round(tranY / this.item.height);
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i = i > (this.columns - 1) ? (this.columns - 1) : i;
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i = i < 0 ? 0 : i;
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j = j < 0 ? 0 : j;
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j = j > rows ? rows : j;
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let endKey = i + this.columns * j;
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endKey = endKey >= this.list.length ? this.list.length - 1 : endKey;
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return endKey
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},
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// 根据起始key和目标key去重新计算每一项的新的key
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insert(origin, end) {
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let list;
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if (origin < end) {
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list = this.list.map((item) => {
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if (item.key > origin && item.key <= end) {
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item.key = item.key - 1;
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} else if (item.key == origin) {
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item.key = end;
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}
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return item
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});
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this.getPosition(list);
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} else if (origin > end) {
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list = this.list.map((item) => {
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if (item.key >= end && item.key < origin) {
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item.key = item.key + 1;
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} else if (item.key == origin) {
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item.key = end;
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}
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return item
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});
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this.getPosition(list);
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}
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},
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// 根据排序后 list 数据进行位移计算
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getPosition(data, vibrate = true) {
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let list = data.map((item, index) => {
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// X轴距离
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let tranX = this.item.width * (item.key % this.columns);
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let rows = Math.ceil((item.key+1) / this.columns);
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let numX = item.key;
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for(let i=0; i<rows-1; i++){
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numX -= this.columns;
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}
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numX = numX * this.$props.padding;
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tranX = tranX != 0 ? tranX + numX : tranX;
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item.tranX = tranX;
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// Y轴距离
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let tranY = Math.floor(item.key / this.columns) * this.item.height;
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if(rows > 1){
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let numY = (rows - 1) * this.$props.padding;
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tranY = tranY + numY;
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}
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item.tranY = tranY;
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return item
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});
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this.list = list;
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if(!vibrate) return;
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this.itemTransition = true;
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// #ifndef H5
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uni.vibrateShort();
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// #endif
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let image_list = [];
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list.forEach((item) => {
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image_list[item.key] = item.data
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});
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// 元素位置发生改变了，触发change事件告诉父元素更新
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this.$emit('change', {image_list: image_list});
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},
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// 拖拽结束
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touchEnd() {
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if (!this.touch) return;
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this.clearData();
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},
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// 清除参数
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clearData() {
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this.originKey = -1;
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this.touch = false;
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this.cur = -1;
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this.tranX = 0;
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this.tranY = 0;
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// 延迟清空
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setTimeout(() => {
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this.curZ = -1;
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}, 300)
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},
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// 初始化加载
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init() {
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// 拦截image_list为空未上传图片的情况
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if(!this.image_list.length) return;
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// 遍历数据源增加扩展项, 以用作排序使用
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let list = this.image_list.map((item, index) => {
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return {
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key: index,
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tranX: 0,
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tranY: 0,
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data: item
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}
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});
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this.list = list;
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this.itemTransition = false;
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this.windowHeight = uni.getSystemInfoSync().windowHeight;
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setTimeout(() => {
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// 获取每一项的宽高等属性
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this.createSelectorQuery().select(".item").boundingClientRect((res) => {
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let rows = Math.ceil(this.list.length / this.columns);
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this.item = res;
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this.getPosition(this.list, false);
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let itemWrapHeight = rows * res.height;
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itemWrapHeight += rows * this.$props.padding - this.$props.padding;
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this.itemWrapHeight = itemWrapHeight;
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this.createSelectorQuery().select(".item-wrap").boundingClientRect((res) => {
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this.itemWrap = res;
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let overOnePage = itemWrapHeight + res.top > this.windowHeight;
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this.overOnePage = overOnePage;
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}).exec();
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}).exec();
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}, 300)
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}
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}
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}
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</script>
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<style lang="scss" scoped="scoped">
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.upload-images{
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display: flex;
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flex-wrap: wrap;
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.upload-image-item{
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// width: 220rpx;
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// height: 220rpx;
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background: #DDDDDD;
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position: relative;
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// margin-right: 12rpx;
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width: 100%;
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height: 100%;
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&:nth-child(3n){
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margin-right: 0rpx;
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}
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&:nth-child(n+4){
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margin-top: 12rpx;
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}
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image{
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width: 100%;
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height: 100%;
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}
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.remove-image{
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position: absolute;
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right: -4rpx;
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top: -18rpx;
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color: #e74c3c;
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font-size: 40rpx;
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padding: 8rpx;
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}
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}
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.upload-image-item-after{
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position: absolute;
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width: 100%;
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height: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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font-size: 60rpx;
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color: #999999;
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}
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}
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.item-wrap {
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position: relative;
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width: 100%;
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.item {
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position: absolute;
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width: 100%;
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z-index: 1;
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&.itemTransition {
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transition: transform 0.3s;
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}
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&.zIndex {
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z-index: 2;
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}
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&.cur {
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background: #1998FE;
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transition: initial;
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}
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}
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}
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.info {
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position: relative;
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// padding-top: 100%;
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background: #ffffff;
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// margin-right: 5px;
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width: auto;
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height: 100%;
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&:nth-child(3n){
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margin-right: 0px;
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}
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& > view {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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overflow: hidden;
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box-sizing: border-box;
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image {
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width: 100%;
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height: 100%;
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}
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}
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}
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.indicator {
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position: fixed;
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z-index: 99999;
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right: 0rpx;
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top: 50%;
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margin-top: -250rpx;
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padding: 20rpx;
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& > view {
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width: 36rpx;
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height: 500rpx;
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background: #ffffff;
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border-radius: 30rpx;
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box-shadow: 0 0 10rpx -4rpx rgba(0, 0, 0, 0.5);
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color: pink;
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padding-top: 90rpx;
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box-sizing: border-box;
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font-size: 24rpx;
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text-align: center;
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opacity: 0.8;
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}
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}
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</style>
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