Preview Image

<template>
  <!-- #ifdef APP -->
  <scroll-view style="flex: 1">
  <!-- #endif -->
    <view style="padding-left: 8px; padding-right: 8px">
      <view>
        <text class="text-desc">图片指示器样式</text>
        <radio-group class="cell-ct" style="background-color: white" @change="onIndicatorChanged">
          <view class="indicator-it" v-for="(item, index) in indicator" :key="item.value">
            <radio :disabled="isWeb" :checked="index == 0" :value="item.value">{{
              item.name
            }}</radio>
          </view>
        </radio-group>
      </view>
      <view>
        <checkbox-group @change="onCheckboxChange" style="margin-top: 16px; margin-left: 8px">
          <checkbox :disabled="isWeb" :checked="isLoop" style="margin-right: 15px">循环播放</checkbox>
        </checkbox-group>
      </view>
      <view>
        <text class="text-desc">长按行为</text>
        <radio-group class="cell-ct" style="background-color: white; margin-bottom: 16px;" @change="onLongPressCheckboxChange">
          <view class="indicator-it" v-for="(item, index) in longPressAction" :key="item.value">
            <radio :disabled="isWeb" :checked="index == 1" :value="item.value">{{
              item.name
            }}</radio>
          </view>
        </radio-group>
      </view>
      <view style="background-color: white">
        <text class="text-desc">点击图片开始预览</text>
        <view class="cell-ct" style="margin: 8px;">
          <view class="cell cell-choose-image" v-for="(image, index) in imageList" :key="index">
            <text style="width: 100px; height: 100px;background-color: lightgray; color: red; text-align: center; line-height: 100px;font-size: 14px;" v-if="image.error"
              @click="previewImage(index)">图片路径非法</text>
            <image style="width: 100px; height: 100px;background-color: white;" mode="aspectFit" :src="image.src"
              v-if="!image.error" @click="previewImage(index)"
              @error="onImageLoadError(index,$event as ImageErrorEvent)">
            </image>
          </view>
          <image class="cell cell-choose-image" src="/static/plus.png" @click="chooseImage">
          </image>
        </view>
      </view>
      <view style="margin:8px;">
        <text style="color: black;font-size: 18px;margin-bottom: 4px;">注意事项:</text>
        <text style="font-size: 17px;margin-left: 4px;color: darkgray;">1、indicator属性仅App平台支持。</text>
        <text style="font-size: 17px;margin-left: 4px;color: darkgray;">2、Web平台不支持loop属性。</text>
      </view>
    </view>
  <!-- #ifdef APP -->
  </scroll-view>
  <!-- #endif -->
</template>

<script setup lang="uts">
  type Indicator = "number" | "default" | "none"
  type ItemType = {
    value : Indicator,
    name : string
  }

  type ImageType = {
    src : string,
    error : boolean
  }

  type LongPressType = {
    value : string,
    name : string
  }

  const imageList = ref([
    { src: "https://qiniu-web-assets.dcloud.net.cn/unidoc/zh/[email protected]", error: false },
    { src: "/static/test-image/logo.png", error: false },
    { src: "/static/test-image/logo.svg", error: false },
    // #ifdef APP
    { src: "/static/uni2.png", error: false },
    // #endif
  ] as ImageType[])

  const indicator = ref([{
    value: "default",
    name: "圆点"
  }, {
    value: "number",
    name: "数字"
  }, {
    value: "none",
    name: "不显示"
  }] as ItemType[])

  const longPressAction = ref([{
    value: "0",
    name: "默认长按行为"
  }, {
    value: "1",
    name: "自定义长按行为"
  }] as LongPressType[])

  const currentIndicator = ref("default"  as Indicator)

  // #ifdef WEB
  const isWeb = ref(true)
  // #endif
  // #ifndef WEB
  const isWeb = ref(false)
  // #endif

  // #ifdef APP-IOS
  const isIOS = ref(true)
  // #endif
  // #ifndef APP-IOS
  const isIOS = ref(false)
  // #endif

  const isLongPress = ref(true)
  const isLoop = ref(true)

  const previewImage = (index : number) => {
    let list = [] as Array<string>
    imageList.value.forEach((item : ImageType) => {
      list.push(item.src)
    })
    uni.previewImage({
      urls: list,
      current: index,
      indicator: currentIndicator.value,
      loop: isLoop.value,
      longPressActions: (isLongPress.value ? ({
        itemList: ["按钮1", "按钮2", "按钮3"],
        itemColor: "#ccc",
        success: (e : LongPressActionsSuccessResult) => {
          uni.showToast({
            title: "用户选中了第" + (e.index + 1) + "张图片，并选中了第" + (e.tapIndex + 1) + "个选项",
            position: "bottom"
          })
        },
        fail: (e : LongPressActionsFailResult) => {
          uni.showToast({
            title: "用户关闭了action sheet",
            position: "bottom"
          })
        }
      } as LongPressActionsOptions) : null)
    })
  }

  const chooseImage = () => {
    uni.chooseImage({
      sourceType: ['album'],
      count: 1,
      success: (e) => {
        imageList.value = imageList.value.concat({ src: e.tempFilePaths[0], error: false } as ImageType)
        // imageList.value = imageList.value.concat(e.tempFilePaths)
      },
      fail(_) {
      }
    })
  }

  const onIndicatorChanged = (e : UniRadioGroupChangeEvent) => {
    currentIndicator.value = e.detail.value as Indicator
  }

  const onCheckboxChange = (_ : UniCheckboxGroupChangeEvent) => {
    isLoop.value = !isLoop.value
  }

  const onLongPressCheckboxChange = (e: UniRadioGroupChangeEvent) => {
    isLongPress.value = (e.detail.value == "1")
  }

  const onImageLoadError = (index : number, error : UniImageErrorEvent) => {
    imageList.value[index].error = true
  }

  const closePreviewImage = ()=>{
    uni.closePreviewImage({})
  }

  const testSetCurrentIndicator = (value:string) =>{
    currentIndicator.value = value as Indicator
  }

  defineExpose({
  	testSetCurrentIndicator,
    previewImage,
    closePreviewImage
  })
</script>

<style>
  .text-desc {
    margin-top: 16px;
    margin-left: 8px;
    margin-bottom: 16px;
    font-weight: bold;
  }

  .cell-ct {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
  }

  .cell {
    margin-left: 3px;
    margin-right: 3px;
    width: 100px;
    height: 100px;
  }

  .cell-choose-image {
    border-width: 1px;
    border-style: solid;
    border-color: lightgray;
  }

  .indicator-it {
    margin: 8px;
  }
  .cell-pd {
    padding: 11px 0px;
  }
</style>