PianoTime/wechat/pages/index/index.js

var app = getApp()

const SEC = 1000
const MIN = 60 * SEC
const HOUR = 60 * MIN
Page({
  data: {
    currentLatitude: 0,     //用户当前纬度
    currentLongitude: 0,    //用户当前经度
    is_btn_disabled: true,  //开始按钮状态
    locationAccuracy: 0,    //gps 误差
    isLearning: false,      //是否在学习中？
    startTime: null,        //开始时间
    clock: '00:00:00',      //计时
    shareCanvasWidth: 200,
    shareCanvasHeight: 280,

  },
  onLoad: function () {
    wx.getSystemInfo({
      success: (res) => {
        this.setData({
          screenWidth: res.screenWidth,
          screenHeight: res.screenHeight,
          bannerWidth: res.screenWidth,
          bannerHeight: res.screenWidth * 363 / 543
        })
      }
    })
    var pt_student = wx.getStorageSync('pt_student')
    
    if (!pt_student) {
      wx.redirectTo({
        url: '/pages/login/index',
      })
    } else {
      app.globalData.ptStudent = pt_student;
    }
    wx.getLocation({
      success: (res) => {
        let validLocation = this.validLocation(res.latitude, res.longitude)
        this.setData({
          currentLatitude: res.latitude,
          currentLongitude: res.longitude,
          accuracy: res.accuracy,
          is_btn_disabled: !validLocation
        })

      }
    })
  },
  validLocation () {
    // TODO
    return true;
  },
  handleBtnClick() {
    let isLearning = this.data.isLearning
    let is_btn_disabled = this.data.is_btn_disabled
    if (is_btn_disabled) {
      wx.showToast({
        title: '请到学校之后再打卡',
        icon: 'none',
        duration: 800
      })
      return;
    }
    if (isLearning) {
      this.setData({
        isLearning: !isLearning
      })
      this.endClock()
    } else {
      this.setData({
        isLearning: !isLearning,
        startTime: new Date().getTime()
      })
      this.startClock()
    }
  },
  startClock() {
    let interval = setInterval(() => {
      let now = new Date().getTime()
      let startTime = this.data.startTime

      let diff = now - startTime
      let hours = Math.floor(diff / HOUR)
      hours = (hours < 10 ? '0' + hours : hours)

      diff = diff % HOUR
      let mins = Math.floor(diff / MIN)
      mins = (mins < 10 ? '0' + mins : mins)

      diff = diff % MIN
      let sec = Math.ceil(diff / SEC)
      sec = (sec < 10 ? '0' + sec : sec)

      
      this.setData({
        clock: "" + hours + ":" + mins + ":" + sec
      })
    }, SEC)
    this.interval = interval
  },
  endClock() {
    clearInterval(this.interval)
    this.setData({
      isLearning: false,
      showPopup: true
    })
    const ctx = wx.createCanvasContext('shareCanvas')
    let width = this.data.shareCanvasWidth
    let height = this.data.shareCanvasHeight
    ctx.fillStyle = "#fff"
    ctx.fillRect(0, 0, width, height)
    ctx.fillStyle = "#000"
    ctx.setFontSize(16)
    ctx.textAlign = 'center'
    ctx.fillText('我已成功打卡14天', width / 2, height / 2 - 7)
    ctx.draw()
    
  },
  togglePopup() {
    this.setData({
      showPopup: !this.data.showPopup
    });
  },
  handleShare() {
    wx.canvasToTempFilePath({
      canvasId: 'shareCanvas',
      success: (res) => {
        wx.saveImageToPhotosAlbum({
          filePath: res.tempFilePath,
          success: () => {
            wx.showToast({
              title: '已保存到相册'
            })
          }
        })
      }
      }, this)
  }
})