<template>
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<view class="previewImage"
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:style="{ 'background-color': 'rgba(0,0,0,' + opacity + ')' }"
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v-if="show"
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@tap="close"
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@touchmove.stop.prevent>
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<swiper class="swiper"
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:current="index"
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@change="swiperChange"
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:disable-touch="swiper"
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:circular="circular">
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<swiper-item v-for="(img, i) in imgs"
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:key="'swiper-item-'+i"
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:id="'swiper-item-'+i">
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<movable-area class="marea"
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scale-area>
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<movable-view :id="'movable-view-'+i"
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:key="'movable-view-'+i"
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class="mview"
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direction="all"
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:out-of-bounds="false"
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:inertia="true"
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damping="90"
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friction="2"
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scale="true"
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scale-min="1"
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scale-max="4"
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:scale-value="scale"
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@scale="onScale"
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@change="movableChange">
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<image :id="'image-'+i"
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:key="'movable-view'+i"
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class="image"
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:src="img"
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:style="{ transform: 'rotateZ(' + deg + 'deg)' }"
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:data-index="i"
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:data-src="img"
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mode="widthFix"
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@touchmove="handletouchmove"
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@touchstart="handletouchstart"
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@touchend="handletouchend" />
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</movable-view>
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</movable-area>
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</swiper-item>
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</swiper>
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<view class="page"
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v-if="imgs.length > 0">
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<text class="text">{{ index + 1 }} / {{ imgs.length }}</text>
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</view>
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<view class="save"
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v-if="saveBtn"
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@click.stop.prevent="save"><text class="text">保存</text></view>
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<view class="rotate"
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v-if="rotateBtn"
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@click.stop.prevent="rotate"><text class="text">旋转</text></view>
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<view class="desc"
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v-if="descs.length > 0 && descs.length == imgs.length && descs[index].length > 0">{{ descs[index] }}</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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name: 'ksj-previewImage', //插件名称
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props: {
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imgs: {
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//图片列表
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type: Array,
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required: true,
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default: () => {
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return [];
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}
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},
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descs: {
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//描述列表
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type: Array,
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required: false,
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default: () => {
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return [];
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}
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},
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//透明度,0到1之间。
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opacity: {
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type: Number,
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default: 0.8
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},
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//保存按键
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saveBtn: {
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type: Boolean,
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default: true
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},
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//旋转按键
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rotateBtn: {
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type: Boolean,
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default: true
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},
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//循环预览
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circular: {
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type: Boolean,
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default: false
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}
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},
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data() {
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return {
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swiper: false, //是否禁用
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show: false, //显示状态
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index: 0, //当前页
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deg: 0, //旋转角度
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time: 0, //定时器
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interval: 1000, //长按事件
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scale: 1 //缩放比例
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};
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},
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methods: {
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//比例变化
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onScale(e) {
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},
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//长按事件相关内容---------开始-------------------
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//接触开始
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handletouchstart(e) {
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var tchs = e.touches.length;
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if (tchs != 1) {
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return false;
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}
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this.time = setTimeout(() => {
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this.onLongPress(e);
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}, this.interval);
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return false;
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},
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//清除定时器
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handletouchend() {
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clearTimeout(this.time);
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if (this.time != 0) {
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//处理点击时间
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}
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return false;
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},
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//清除定时器
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handletouchmove() {
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clearTimeout(this.time);
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this.time = 0;
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},
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// 处理长按事件
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onLongPress(e) {
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var src = e.currentTarget.dataset.src;
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var index = e.currentTarget.dataset.index;
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var data = { src: src, index: index };
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this.$emit('longPress', data);
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},
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//长按事件相关内容---------结束-------------------
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//图片改变
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swiperChange(e) {
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this.index = e.target.current; //更新当前图片index
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this.$nextTick(function() {
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this.scale = 1;
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})
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//this.deg = 0; //旋转角度
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//this.swiper=true;
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},
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//移动变化
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movableChange(e) {
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//console.log(e);
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/* if(this.old.scale <= 1){
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this.swiper=false;
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}else if(e.detail.x===0){
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this.swiper=false;
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} */
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},
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//保存
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save(e) {
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var _this = this;
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var src = this.imgs[this.index];
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//#ifdef MP-WEIXIN
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//提前向用户发起授权请求
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uni.authorize({
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scope: 'scope.writePhotosAlbum',
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success() {
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// console.log('kxj-previewImage:允许储存');
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_this.downloadImg(src);
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}
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});
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//#endif
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//#ifdef APP-PLUS
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this.downloadImg(src);
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//#endif
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//#ifdef H5
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//非同源图片将直接打开
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var abtn = document.createElement('a');
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abtn.href = src;
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abtn.download = '';
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abtn.target = '_blank';
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abtn.click();
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//#endif
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},
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//下载并保存文件
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downloadImg(src) {
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//下载图片文件
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uni.showLoading({
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title: '大图提取中'
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});
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uni.downloadFile({
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url: src,
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success: function(res) {
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// console.log('kxj-previewImage:下载成功');
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uni.hideLoading();
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uni.saveImageToPhotosAlbum({
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filePath: res.tempFilePath,
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success: () => {
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uni.showToast({
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title: '已保存至相册',
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duration: 1000
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});
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}
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});
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},
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fail: function() {
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uni.hideLoading();
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uni.showToast({
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title: '图片下载失败',
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icon: 'none',
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duration: 1000
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});
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}
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});
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},
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//旋转
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rotate(e) {
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this.deg = this.deg == 270 ? 0 : this.deg + 90;
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},
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//打开
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open(e) {
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if (e === null || e === '') {
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console.log('kxj-previewImage:打开参数无效');
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return;
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}
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if (!isNaN(e)) {
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if (e >= this.imgs.length) {
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console.log('kxj-previewImage:打开参数无效');
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} else {
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this.index = e;
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}
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} else {
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var index = this.imgs.indexOf(e);
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if (index === -1) {
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this.imgs = [e];
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this.index = 0;
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console.log('kxj-previewImage:未在图片地址数组中找到传入的图片，已为你自动打开单张预览模式')
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} else {
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this.index = this.imgs.indexOf(e);
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}
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}
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// console.log('kxj-previewImage:当前预览图片序号'+this.index);
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this.show = true;
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},
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//关闭
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close(e) {
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this.show = false;
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this.index = 0; //当前页
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this.deg = 0; //旋转角度
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this.time = 0; //定时器
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this.interval = 1000; //长按事件
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this.scale = 1; //缩放比例
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}
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}
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};
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</script>
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<!--使用scss,只在本组件生效-->
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<style lang="scss"
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scoped>
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.previewImage {
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z-index: 999;
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position: fixed;
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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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background-color: #000000;
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user-select: none;
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.swiper {
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width: 100%;
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height: 100%;
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.marea {
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height: 100%;
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width: 100%;
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position: fixed;
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overflow: hidden;
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.mview {
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display: flex;
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align-items: center;
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justify-content: center;
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width: 100%;
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height: auto;
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min-height: 100%;
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.image {
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width: 100%;
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}
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}
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}
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}
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.page {
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position: absolute;
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width: 100%;
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bottom: 20rpx;
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text-align: center;
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.text {
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color: #fff;
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font-size: 26rpx;
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background-color: rgba(0, 0, 0, 0.5);
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padding: 3rpx 16rpx;
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border-radius: 20rpx;
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user-select: none;
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}
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}
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.save {
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position: absolute;
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left: 10rpx;
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width: 120rpx;
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height: 56rpx;
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bottom: 10rpx;
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text-align: center;
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padding: 10rpx;
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.text {
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background-color: rgba(0, 0, 0, 0.5);
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color: #fff;
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font-size: 30rpx;
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border-radius: 20rpx;
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border: 1rpx solid #f1f1f1;
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padding: 6rpx 22rpx;
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user-select: none;
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}
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.text:active {
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background-color: rgba(100, 100, 100, 0.5);
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}
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}
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.rotate {
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position: absolute;
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right: 10rpx;
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width: 120rpx;
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height: 56rpx;
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bottom: 10rpx;
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text-align: center;
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padding: 10rpx;
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.text {
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background-color: rgba(0, 0, 0, 0.5);
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color: #fff;
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font-size: 30rpx;
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border-radius: 20rpx;
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border: 1rpx solid #f1f1f1;
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padding: 6rpx 22rpx;
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user-select: none;
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}
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.text:active {
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background-color: rgba(100, 100, 100, 0.5);
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}
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}
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.desc {
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position: absolute;
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top: 0;
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width: 100%;
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padding: 5rpx 10rpx;
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text-align: center;
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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background-color: rgba(0, 0, 0, 0.5);
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color: #fff;
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font-size: 28rpx;
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letter-spacing: 3rpx;
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user-select: none;
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}
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}
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</style>
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