<template>
  <!-- <view class="page-scroll-view"> -->
    <page-head title="非下拉刷新的scroll-view属性示例"></page-head>

    <!-- 暂时分成两个方向不同的滚动视图，原因为：scroll-view组件不支持动态改变direction。 -->
    <scroll-view v-if="scrollX" direction="horizontal" :scroll-top="scrollTop" :scroll-left="scrollLeft"
      :upper-threshold="upperThreshold" :lower-threshold="lowerThreshold" :scroll-into-view="scrollIntoView"
      :enable-back-to-top="enableBackToTop" :scroll-with-animation="scrollWithAnimation" style="flex-direction: row;"
      class="uni-margin-wrap" :show-scrollbar="showScrollbar" :bounces="bounces" @scrolltoupper="scrolltoupper"
      @scrolltolower="scrolltolower" @scroll="scroll" @scrollend="scrollend" ref="scrollViewX" id="scrollViewX">
      <!-- h-margin-right末尾元素添加margin-right 测试bug #3866-->
      <view class="item" :id="'horizontal_'+item.id" v-for="(item,index) in items"
        :class="index==9 ? 'h-margin-right': ''">
        <text class="uni-text">{{item.label}}</text>
      </view>
    </scroll-view>
    <scroll-view v-else direction="vertical" :scroll-top="scrollTop" :scroll-left="scrollLeft"
      :upper-threshold="upperThreshold" :lower-threshold="lowerThreshold" :scroll-into-view="scrollIntoView"
      :enable-back-to-top="enableBackToTop" :scroll-with-animation="scrollWithAnimation" :show-scrollbar="showScrollbar"
      :bounces="bounces" @scrolltoupper="scrolltoupper" @touchmove="onTouchMove" @scrolltolower="scrolltolower"
      @scroll="scroll" @scrollend="scrollend" ref="scrollViewY" id="scrollViewY" class="uni-margin-wrap">
      <!-- v-margin-bottom末尾元素添加margin-bottom 测试bug #3866-->
      <view class="item" :id="item.id" v-for="(item, index) in items" :class="index==9 ? 'v-margin-bottom': ''">
        <text class="uni-text">{{item.label}}</text>
      </view>
    </scroll-view>

    <scroll-view class="uni-list" :showScrollbar="true" :scroll-y="true">
      <view class="uni-list-cell uni-list-cell-padding">
        <text>点击状态栏回到顶部（仅iOS）</text>
        <switch :checked="enableBackToTop" @change="enableBackToTop=!enableBackToTop"></switch>
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>是否显示滚动条</text>
        <switch :checked="showScrollbar" @change="showScrollbar=!showScrollbar"></switch>
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>是否有反弹效果</text>
        <switch :checked="bounces" @change="bounces=!bounces"></switch>
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>是否开启滚动时使用动画过渡</text>
        <switch :checked="scrollWithAnimation" @change="scrollWithAnimation=!scrollWithAnimation"></switch>
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>是否横向滚动</text>
        <switch :checked="scrollX" @change="changeDirectionX"></switch>
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>是否竖向滚动</text>
        <switch :checked="scrollY" @change="changeDirectionY"></switch>
      </view>
      <view class="uni-slider uni-list-cell-padding">
        <text>拖动设置scroll-top</text>
      </view>
      <view class="uni-slider uni-list-cell-padding">
        <slider :max="1000" :min="0" :step="10" :value="scrollTop" :show-value="true" @change="handleChangeScrollTop" />
      </view>
      <view class="uni-slider uni-list-cell-padding">
        <text>拖动设置scroll-left</text>
      </view>
      <view class="uni-slider uni-list-cell-padding">
        <slider :max="1000" :min="0" :step="10" :value="scrollLeft" :show-value="true"
          @change="handleChangeScrollLeft" />
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>设置触发scrolltoupper的距离</text>
        <input class="uni-list-cell-input" type="number" :value="upperThreshold" @input="handleUpperThresholdInput" />
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <text>设置触发scrolltolower的距离</text>
        <input class="uni-list-cell-input" type="number" :value="lowerThreshold" @input="handleLowerThresholdInput" />
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
        <button type="primary" class="button" @click="handleScrollIntoView">
          滚动到id为`item3`的子视图
        </button>
      </view>
      <view class="uni-list-cell uni-list-cell-padding">
      </view>
    </scroll-view>
  <!-- </view> -->
</template>

<script>
  type Item = {
    id : string,
    label : string,
  }
  export default {
    data() {
      return {
        items: [] as Item[],
        scrollX: false,
        scrollY: true,
        bounces: false,
        scrollTop: 0,
        scrollLeft: 0,
        scrollChangeTop: 0,
        scrollIntoView: "",
        enableBackToTop: false,
        scrollWithAnimation: false,
        showScrollbar: true,
        upperThreshold: 50,
        lowerThreshold: 50,
      }
    },

    onLoad() {
      for (let i = 0; i < 10; i++) {
        const item = {
          id: "item" + i,
          label: "item" + i,
        } as Item;
        this.items.push(item);
      }
    },
    methods: {
      handleChangeScrollLeft(e : UniSliderChangeEvent) {
        this.scrollLeft = e.detail.value;
      },
      handleChangeScrollTop(e : UniSliderChangeEvent) {
        this.scrollTop = e.detail.value;
      },
      changeDirectionX() {
        this.scrollX = !this.scrollX;
        if (this.scrollX) {
          this.scrollY = false
        }
        this.scrollTop = 0;
        this.scrollLeft = 0;
      },
      changeDirectionY() {
        this.scrollY = !this.scrollY;
        if (this.scrollY) {
          this.scrollX = false
        }
        this.scrollTop = 0;
        this.scrollLeft = 0;
      },
      handleScrollIntoView() {
        if (this.scrollX) {
          this.scrollIntoView = "horizontal_item3";
        } else {
          this.scrollIntoView = "item3";
        }
        //重置状态，由于响应式的原因，设置的值与当前值相同，会导致再次设置无效果。
        setTimeout(() => {
          this.scrollIntoView = "";
        }, 0);
      },
      handleUpperThresholdInput(e : InputEvent) {
        const value = e.detail.value;
        if (value == "") {
          this.upperThreshold = 50;
        } else {
          this.upperThreshold = parseInt(e.detail.value);
        }
      },
      handleLowerThresholdInput(e : InputEvent) {
        const value = e.detail.value;
        if (value == "") {
          this.lowerThreshold = 50;
        } else {
          this.lowerThreshold = parseInt(e.detail.value);
        }
      },
      //事件监听
      scrolltoupper() {
        console.log("滚动到顶部");
      },
      scrolltolower() {
        console.log("滚动到底部");
      },
      scroll(e : ScrollEvent) {
        this.scrollChangeTop = e.detail.scrollTop
        console.log("scroll-top : " + e.detail.scrollTop + " scroll-left : " + e.detail.scrollLeft);
      },
      scrollend() {
        console.log("滚动停止");
      },
      onTouchMove() {
        console.log("TouchMove");
      },
      //自动化测试专用
      checkScrollHeight() : Boolean {
        var element = this.$refs["scrollViewY"]
        if (element != null) {
          var scrollHeight = (element as UniElement).scrollHeight
          console.log("checkScrollHeight" + scrollHeight)
          if (scrollHeight > 1900) {
            return true
          }
        }
        return false
      },
      //自动化测试专用
      checkScrollWidth() : Boolean {
        var element = this.$refs["scrollViewX"]
        if (element != null) {
          var scrollWidth = (element as UniElement).scrollWidth
          console.log("checkScrollWidth---" + scrollWidth)
          if (scrollWidth > 1900) {
            return true
          }
        }
        return false
      }
    }
  }
</script>

<style>
  .uni-margin-wrap {
    height: 250px;
    margin: 0 25px 25px 25px;
  }

  .item {
    justify-content: center;
    align-items: center;
    height: 250px;
    width: 100%;
    background-color: azure;
    border-width: 1px;
    border-style: solid;
    border-color: chocolate;
  }

  .uni-list {
    flex: 1;
  }

  .uni-text {
    color: black;
    font-size: 50px;
  }

  .uni-slider {
    justify-content: center;
  }

  .uni-list-cell-input {
    width: 50px;
    border: 1px solid #ccc;
    text-align: center;
  }

  .button {
    flex: 1;
  }

  /*自动化测试专用*/
  .v-margin-bottom {
    margin-bottom: 50px;
  }

  /*自动化测试专用*/
  .h-margin-right {
    margin-right: 50px;
  }
</style>