<template>
  <!-- #ifdef APP -->
  <scroll-view class="page-scroll-view">
  <!-- #endif -->
    <view>
      <page-head title="scroll-view,区域滚动视图"></page-head>
      <view class="uni-padding-wrap uni-common-mt">
        <view class="uni-title uni-common-mt">
          <text class="uni-title-text">Vertical Scroll</text>
          <text class="uni-subtitle-text">纵向滚动</text>
        </view>
        <view>
          <scroll-view :scroll-top="scrollTop" direction="vertical" class="scroll-Y" scroll-with-animation="true"
            @scrolltoupper="upper" @scrolltolower="lower" @scroll="scroll" @scrollend="end"
            :show-scrollbar="showScrollbar" id="verticalScrollView">
            <view class="scroll-view-item uni-bg-red"><text class="text">A</text></view>
            <view class="scroll-view-item uni-bg-green"><text class="text">B</text></view>
            <view class="scroll-view-item uni-bg-blue"><text class="text">C</text></view>
          </scroll-view>
        </view>
        <view @tap="goTop" class="uni-center uni-common-mt">
          <text class="uni-link">点击这里返回顶部</text>
        </view>

        <view class="uni-title uni-common-mt">
          <text class="uni-title-text">Horizontal Scroll</text>
          <text class="uni-subtitle-text">横向滚动</text>
        </view>
        <view>
          <scroll-view class="scroll-view_H" direction="horizontal" @scroll="scroll" @scrollend="end"
            :scroll-left="scrollLeft" :show-scrollbar="showScrollbar">
            <view class="scroll-view-item_H uni-bg-red"><text class="text">A</text></view>
            <view class="scroll-view-item_H uni-bg-green"><text class="text">B</text></view>
            <view class="scroll-view-item_H uni-bg-blue"><text class="text">C</text></view>
          </scroll-view>
        </view>

        <navigator url="/pages/component/scroll-view/scroll-view-props" hover-class="none">
          <button type="primary" class="button">
            非下拉刷新的属性示例
          </button>
        </navigator>
        <view class="uni-common-pb"></view>

        <navigator url="/pages/component/scroll-view/scroll-view-refresher-props" hover-class="none">
          <button type="primary" class="button">
            下拉刷新的属性示例
          </button>
        </navigator>
        <view class="uni-common-pb"></view>
        <navigator url="/pages/component/scroll-view/scroll-view-refresher" hover-class="none">
          <button type="primary" class="button"> 默认下拉刷新示例 </button>
        </navigator>
        <view class="uni-common-pb"></view>
        <navigator url="/pages/component/scroll-view/scroll-view-custom-refresher-props" hover-class="none">
          <button type="primary" class="button">
            自定义下拉刷新示例
          </button>
        </navigator>
        <view class="uni-common-pb"></view>
      </view>
    </view>
  <!-- #ifdef APP -->
  </scroll-view>
  <!-- #endif -->
</template>
<script lang="uts">
  type ScrollEventTest = {
    type : string;
    target : UniElement | null;
    currentTarget : UniElement | null;
    direction ?: string
  }
  export default {
    data() {
      return {
        scrollTop: 0,
        oldScrollTop: 0,
        scrollLeft: 120,
        showScrollbar: true,
        // 自动化测试
        isScrollTest: '',
        isScrolltolowerTest: '',
        isScrolltoupperTest: '',
        scrollDetailTest: null as UniScrollEventDetail | null,
        scrollEndDetailTest: null as UniScrollEventDetail | null,
      }
    },
    methods: {
      upper: function (e : UniScrollToUpperEvent) {
        console.log('滚动到顶部/左边', e)
        this.checkEventTest({
          type: e.type,
          target: e.target,
          currentTarget: e.currentTarget,
          direction: e.detail.direction,
        } as ScrollEventTest, 'scrolltoupper')
      },
      lower: function (e : UniScrollToLowerEvent) {
        console.log('滚动到底部/右边', e)
        this.checkEventTest({
          type: e.type,
          target: e.target,
          currentTarget: e.currentTarget,
          direction: e.detail.direction,
        } as ScrollEventTest, 'scrolltolower')
      },
      scroll: function (e : UniScrollEvent) {
        this.scrollDetailTest = e.detail
        this.checkEventTest({
          type: e.type,
          target: e.target,
          currentTarget: e.currentTarget
        } as ScrollEventTest, 'scroll')
        this.oldScrollTop = e.detail.scrollTop
      },
      end: function (e : UniScrollEvent) {
        console.log('滚动结束时触发', e)
        this.scrollEndDetailTest = e.detail
        this.checkEventTest({
          type: e.type,
          target: e.target,
          currentTarget: e.currentTarget
        } as ScrollEventTest, 'scrollend')
      },
      goTop: function () {
        // 解决view层不同步的问题
        this.scrollTop = this.oldScrollTop
        this.$nextTick(() => {
          this.scrollTop = 0
        })
        uni.showToast({
          icon: 'none',
          title: '纵向滚动 scrollTop 值已被修改为 0',
        })
      },
      // 自动化测试专用（由于事件event参数对象中存在循环引用，在ios端JSON.stringify报错，自动化测试无法page.data获取）
      checkEventTest(e : ScrollEventTest, eventName : String) {
        // #ifndef MP
        const isPass = e.type === eventName && e.target instanceof UniElement && e.currentTarget instanceof UniElement;
        // #endif
        // #ifdef MP
        const isPass = true
        // #endif
        const result = isPass ? `${eventName}:Success` : `${eventName}:Fail`;
        switch (eventName) {
          case 'scroll':
            this.isScrollTest = result
            break;
          case 'scrolltolower':
            this.isScrolltolowerTest = result + `-${e.direction}`
            break;
          case 'scrolltoupper':
            this.isScrolltoupperTest = result + `-${e.direction}`
            break;
          default:
            break;
        }
      },
      // 自动化测试专用
      setVerticalScrollBy(y : number) {
        const element = uni.getElementById("verticalScrollView")
        if (element != null) {
          element.scrollBy(0, y)
        }
      }
    },
  }
</script>

<style>
  .scroll-Y {
    height: 150px;
  }

  .scroll-view_H {
    width: 100%;
    flex-direction: row;
  }

  .scroll-view-item {
    height: 150px;
    justify-content: center;
    align-items: center;
  }

  .scroll-view-item_H {
    width: 100%;
    height: 150px;
    justify-content: center;
    align-items: center;
  }

  .text {
    font-size: 18px;
    color: #ffffff;
  }

  .button {
    margin-top: 15px;
  }
</style>