// components/paging/index.js
Component({
  /**
   * 组件的属性列表
   */
  properties: {
    currentIndex: { //当前页码
      type: Number,
      value: 1
    },
    totalPage: {
      type: Number
    }
  },
 
  /**
   * 组件的初始数据
   */
  data: {
    index: 1,
    total: 0,
    pageMask: false,
    prevBtnDis: true,
    nextBtnDis: true
  },
 
  /**
   * 组件的方法列表
   */
  lifetimes: {
     // 在组件实例进入页面节点树时执行
    attached: function () {
      this.setData({
        index: this.data.currentIndex,
        total: this.data.totalPage
      })
    },
    // 在组件实例被从页面节点树移除时执行
    detached: function () {
      
    }
  },
  methods: {
    //每次改变页码就调用该函数
    currentChangeEmit: function (touchState) {
      // 自定义组件向父组件传值 
        const option = {
          currentIndex: this.data.index,
          touchState: true
        };
      if (touchState) option.touchState = !touchState;
      // pagingChange 自定义名称事件，父组件中使用
      this.triggerEvent('pagingChange', option)
      /*
       在父组件中写上bind:pagingChanget="get_emit",在父组件中就需要调用get_emit事件
      */
    },
    //开启页码弹窗
    shopPagePopup: function () {
      this.setData({
        pageMask: true
      })
    },
    //关闭页码弹窗
    hidePagePopup: function () {
      this.setData({
        pageMask: false
      })
    },
    //更改页码点击事件
    changePage: function (e) {
      //console.log("更改页码事件：",e);
      this.setData({
        pageMask: false,
        index: e.currentTarget.dataset.index
      })
      if (this.data.prevBtnDis || this.data.nextBtnDis) {
        this.currentChangeEmit(true);
      }else{
        this.currentChangeEmit();
      }
      this.judgeBtnDis();
      this.setData({
        index: this.data.currentIndex,
        total: this.data.totalPage
      })
    },
    //上一页点击事件
    prevPage: function () {
      let num = (this.data.index == 1) ? 1 : this.data.index - 1;
      this.setData({
        index: num
      })
      if (this.data.prevBtnDis) {
        this.currentChangeEmit(true);
      } else {
        this.currentChangeEmit();
      }
      this.judgeBtnDis();
      this.setData({
        index: this.data.currentIndex,
        total: this.data.totalPage
      })
    },
    //下一页点击事件
    nextPage: function () {
      let num = (this.data.index == this.data.total) ? this.data.total : this.data.index + 1;
      this.setData({
        index: num
      })
      if (this.data.nextBtnDis) {
        this.currentChangeEmit(true);
      } else {
        this.currentChangeEmit();
      }
      this.judgeBtnDis();
      this.setData({
        index: this.data.currentIndex,
        total: this.data.totalPage
      })
    },
    //判断按钮是否为disabled
    judgeBtnDis: function () {
      let index = this.data.index;
      if (index == this.data.total) {
        this.setData({
          nextBtnDis: true
        })
        if(index==1){
          this.setData({
            prevBtnDis: true
          })
        }else{
          this.setData({
            prevBtnDis: false
          })
        }
      } else if (index == 1){
        this.setData({
          prevBtnDis: true
        })
        if (index == this.data.total){
          this.setData({
            nextBtnDis: true
          })
        }else{
          this.setData({
            nextBtnDis: false
          })
        }
      }else{
        this.setData({
          prevBtnDis: false
        })
        this.setData({
          nextBtnDis: false
        })
      }
    },
   
  
  },
  observers: {
    'totalPage': function(rate) {
      this.setData({
        index: this.data.currentIndex,
        total: this.data.totalPage
      })
    }
  }
})