326 lines
9.9 KiB
Vue
326 lines
9.9 KiB
Vue
<template>
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<view class="preview-container">
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<!-- 右上角关闭按钮 -->
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<view class="close-btn" @click="close">
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<text class="close-icon">✕</text>
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</view>
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<!-- 下载按钮 -->
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<view class="download-btn" @click="downloadImage">
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<text class="download-icon">⬇️</text>
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</view>
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<!-- 图片预览区域，使用movable-area和movable-view实现缩放移动 -->
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<movable-area class="movable-area" :style="{ width: '100vw', height: '100vh' }">
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<movable-view
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class="movable-view"
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direction="all"
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:scale="true"
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:scale-min="0.5"
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:scale-max="3"
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:scale-value="scaleValue"
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@scale="onScale"
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:x="x"
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:y="y"
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:style="{
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width: rotatedWidth + 'px',
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height: rotatedHeight + 'px'
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}"
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>
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<view
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class="image-wrapper"
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:style="{
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width: imgWidth + 'px',
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height: imgHeight + 'px',
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transform: 'rotate(90deg)',
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transformOrigin: 'center center'
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}"
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>
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<image
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:src="imageUrl"
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class="preview-img"
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mode="aspectFill"
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:style="{
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width: imgWidth + 'px',
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height: imgHeight + 'px'
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}"
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@load="onImageLoad"
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></image>
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</view>
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</movable-view>
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</movable-area>
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<!-- 图片信息提示 -->
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<view class="scale-tip" v-if="showScaleTip">
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当前缩放: {{ Math.round(scaleValue * 100) }}%
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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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onLoad(options) {
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this.imageUrl = decodeURIComponent(options.url) // 接收传递的图片URL，需要解码
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},
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data() {
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return {
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imageUrl: '',
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// 缩放相关
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scaleValue: 1,
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x: 0,
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y: 0,
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// 图片原始尺寸
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imgWidth: 0,
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imgHeight: 0,
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// 旋转后的尺寸（交换宽高）
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rotatedWidth: 0,
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rotatedHeight: 0,
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// 提示显示控制
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showScaleTip: false,
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tipTimer: null,
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// 屏幕尺寸
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windowWidth: 0,
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windowHeight: 0
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}
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},
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mounted() {
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// 获取屏幕尺寸
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const systemInfo = uni.getSystemInfoSync();
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this.windowWidth = systemInfo.windowWidth;
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this.windowHeight = systemInfo.windowHeight;
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},
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methods: {
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// 图片加载完成后获取尺寸
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onImageLoad(e) {
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const { width, height } = e.detail;
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// 保存原始尺寸
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this.imgWidth = width;
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this.imgHeight = height;
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// 旋转90度后，宽度和高度互换
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this.rotatedWidth = height; // 旋转后宽度 = 原高度
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this.rotatedHeight = width; // 旋转后高度 = 原宽度
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// 计算初始位置居中
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this.resetPosition();
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console.log('图片加载:', {width, height}, '旋转后:', {rotatedWidth: this.rotatedWidth, rotatedHeight: this.rotatedHeight});
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},
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// 重置位置到中心
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resetPosition() {
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// 计算居中的偏移量
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this.x = (this.windowWidth - this.rotatedWidth) / 2;
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this.y = (this.windowHeight - this.rotatedHeight) / 2;
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console.log('重置位置:', {x: this.x, y: this.y, windowWidth: this.windowWidth, windowHeight: this.windowHeight});
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},
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// 缩放事件处理
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onScale(e) {
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this.scaleValue = e.detail.scale;
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// 显示缩放提示
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this.showScaleTip = true;
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if (this.tipTimer) {
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clearTimeout(this.tipTimer);
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}
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this.tipTimer = setTimeout(() => {
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this.showScaleTip = false;
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}, 1500);
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},
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// 关闭预览
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close() {
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uni.navigateBack();
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},
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// 下载图片
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downloadImage() {
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uni.showLoading({
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title: '下载中...'
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});
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// 先获取图片信息（如果是网络图片需要先下载）
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uni.downloadFile({
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url: this.imageUrl,
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success: (res) => {
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if (res.statusCode === 200) {
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// 保存图片到相册
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uni.saveImageToPhotosAlbum({
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filePath: res.tempFilePath,
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success: () => {
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uni.hideLoading();
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uni.showToast({
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title: '保存成功',
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icon: 'success'
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});
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},
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fail: (err) => {
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uni.hideLoading();
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console.error('保存失败', err);
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// 处理用户拒绝权限的情况
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if (err.errMsg.includes('auth deny')) {
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uni.showModal({
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title: '提示',
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content: '需要您授权保存图片到相册',
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success: (res) => {
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if (res.confirm) {
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uni.openSetting({
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success: (settingRes) => {
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console.log('打开设置页面', settingRes);
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}
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});
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}
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}
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});
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} else {
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uni.showToast({
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title: '保存失败',
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icon: 'none'
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});
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}
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}
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});
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} else {
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uni.hideLoading();
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uni.showToast({
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title: '下载失败',
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icon: 'none'
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});
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}
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},
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fail: (err) => {
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uni.hideLoading();
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console.error('下载失败', err);
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uni.showToast({
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title: '下载失败',
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icon: 'none'
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});
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}
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});
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},
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// 双击重置缩放和位置（可选功能）
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onDoubleTap() {
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this.scaleValue = 1;
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this.resetPosition();
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}
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},
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// 页面返回前清理定时器
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onUnload() {
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if (this.tipTimer) {
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clearTimeout(this.tipTimer);
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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>
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.preview-container {
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position: relative;
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width: 100vw;
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height: 100vh;
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background: #000;
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overflow: hidden;
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}
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.movable-area {
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width: 100vw;
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height: 100vh;
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background: #000;
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}
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.movable-view {
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display: flex;
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align-items: center;
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justify-content: center;
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}
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.image-wrapper {
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display: flex;
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align-items: center;
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justify-content: center;
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transition: transform 0.1s ease;
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}
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.preview-img {
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display: block;
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}
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// 关闭按钮
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.close-btn {
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position: fixed;
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top: 30rpx;
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right: 30rpx;
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width: 60rpx;
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height: 60rpx;
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background: rgba(0, 0, 0, 0.5);
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border-radius: 50%;
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display: flex;
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align-items: center;
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justify-content: center;
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z-index: 1000;
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backdrop-filter: blur(10px);
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border: 1px solid rgba(255, 255, 255, 0.2);
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.close-icon {
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color: #fff;
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font-size: 40rpx;
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line-height: 1;
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}
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}
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// 下载按钮
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.download-btn {
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position: fixed;
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top: 30rpx;
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right: 110rpx;
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width: 60rpx;
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height: 60rpx;
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background: rgba(0, 0, 0, 0.5);
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border-radius: 50%;
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display: flex;
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align-items: center;
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justify-content: center;
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z-index: 1000;
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backdrop-filter: blur(10px);
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border: 1px solid rgba(255, 255, 255, 0.2);
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.download-icon {
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color: #fff;
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font-size: 40rpx;
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line-height: 1;
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}
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}
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// 缩放提示
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.scale-tip {
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position: fixed;
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bottom: 100rpx;
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left: 50%;
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transform: translateX(-50%);
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background: rgba(0, 0, 0, 0.6);
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color: #fff;
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padding: 10rpx 30rpx;
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border-radius: 40rpx;
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font-size: 28rpx;
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z-index: 1000;
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backdrop-filter: blur(10px);
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border: 1px solid rgba(255, 255, 255, 0.2);
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animation: fadeInOut 1.5s ease;
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}
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@keyframes fadeInOut {
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0% { opacity: 0; }
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15% { opacity: 1; }
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85% { opacity: 1; }
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100% { opacity: 0; }
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}
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</style> |