uniapp 图片拖拽滑动或双指放大缩小

<template>
    <view class="page-body">
        <page-head title="movable-view,可拖动视图"></page-head>
        <view class="uni-padding-wrap uni-common-mt">
            <view class="uni-title uni-common-mt">
                示例 1
                <text>\nmovable-view 区域小于 movable-area</text>
            </view>
            <movable-area>
                <movable-view :x="x" :y="y" direction="all" @change="onChange">text</movable-view>
            </movable-area>
            <view @tap="tap" class="uni-link uni-center uni-common-mt">
                点击这里移动至 (30px, 30px)
            </view>
            <view class="uni-title uni-common-mt">
                示例 2
                <text>\nmovable-view区域大于movable-area</text>
            </view>
            <movable-area>
                <movable-view class="max" direction="all">text</movable-view>
            </movable-area>
            <view class="uni-title uni-common-mt">
                示例 3
                <text>\n只可以横向移动</text>
            </view>
            <movable-area>
                <movable-view direction="horizontal">text</movable-view>
            </movable-area>
            <view class="uni-title uni-common-mt">
                示例 4
                <text>\n只可以纵向移动</text>
            </view>
            <movable-area>
                <movable-view direction="vertical">text</movable-view>
            </movable-area>
            <view class="uni-title uni-common-mt">
                示例 5
                <text>\n可超出边界</text>
            </view>
            <movable-area>
                <movable-view direction="all" out-of-bounds>text</movable-view>
            </movable-area>
            <view class="uni-title uni-common-mt">
                示例 6
                <text>\n带有惯性</text>
            </view>
            <movable-area>
                <movable-view direction="all" inertia>text</movable-view>
            </movable-area>
            <view class="uni-title uni-common-mt">
                示例 7
                <text>\n可放缩</text>
            </view>
            <movable-area scale-area>
                <movable-view direction="all" @scale="onScale" scale scale-min="0.5" scale-max="4" :scale-value="scale">text</movable-view>
            </movable-area>
            <view @tap="tap2" class="uni-link uni-center uni-common-mt" style="padding-bottom:80rpx;">
                点击这里放大3倍
            </view>
        </view>
    </view>
</template>

<script>
    export default {
        data() {
            return {
                x: 0,
                y: 0,
                scale: 2,
                old: {
                    x: 0,
                    y: 0,
                    scale: 2
                }
            }
        },
        methods: {
            tap: function(e) {
                // 解决view层不同步的问题
                this.x = this.old.x
                this.y = this.old.y
                this.$nextTick(function() {
                    this.x = 30
                    this.y = 30
                })
            },
            tap2() {
                // 解决view层不同步的问题
                this.scale = this.old.scale
                this.scale = this.old.scale
                this.$nextTick(function() {
                    this.scale = 3
                })
            },
            onChange: function(e) {
                this.old.x = e.detail.x
                this.old.y = e.detail.y
            },
            onScale: function(e) {
                this.old.scale = e.detail.scale
            }
        }
    }
</script>

<style>
    movable-view {
        display: flex;
        align-items: center;
        justify-content: center;
        height: 150rpx;
        width: 150rpx;
        background-color: #007AFF;
        color: #fff;
    }
    movable-area {
        height: 300rpx;
        width: 100%;
        background-color: #D8D8D8;
        overflow: hidden;
    }
    .max {
        width:500rpx;
        height: 500rpx;
    }
</style>