reader/pages/score/index.js

import {
  createStoreBindings
} from 'mobx-miniprogram-bindings'
import {
  store
} from '~/store/index'
Page({
  /**
   * 页面的初始数据
   */
  data: {
    score: {},
    // 目前用来处理区分上传普通作品还是朗读赛作品
    readingType: '',
    uploadHide: ''
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad(options) {
    this.storeBindings = createStoreBindings(this, {
      store,
      fields: {
        userInfo: 'userInfo',
        readDetail: 'readDetail'
      },
    })
    this.storeBindings.updateStoreBindings()
    let score = this.data.readDetail
    wx.setNavigationBarTitle({
      title: score.title
    })
    this.setData({
      score,
      readingType: options.readingType ? options.readingType : ''
    })
  },
  backReading() {
    wx.redirectTo({
      url: `/pages/reading/index?videoId=${this.data.score.id}&reset=true&uploadHide=${this.data.uploadHide}&readingType=${this.data.readingType}`,
    })
  },
  hideFooter() {
    this.setData({
      uploadHide: true
    })
  },
  creatShare() {
    let video = this.data.readDetail
    console.log(video);
    return new Promise((resolve, reject) => {
      let context = wx.createSelectorQuery();
      context
        .select('#share')
        .fields({
          node: true,
          size: true
        }).exec((res) => {
          const canvas = res[0].node;
          const ctx = canvas.getContext('2d');
          const dpr = wx.getSystemInfoSync().pixelRatio;
          canvas.width = res[0].width * dpr;
          canvas.height = res[0].height * dpr;
          ctx.scale(dpr, dpr);
          ctx.font = '14px PingFang';
          let pic = canvas.createImage();
          pic.src = video.resourcesType == 1 ? video.aBg : video.coverImg;
          pic.onload = () => {
            ctx.drawImage(pic, 0, 0, 375, 211);
            if (video.resourcesType == 1) {
              let aBg = canvas.createImage();
              aBg.src = '/static/shareAudioBg.png';
              aBg.onload = () => {
                ctx.drawImage(aBg, 127.5, 38, 120, 120);
                let rate = 0.5
                ctx.arc(
                  Math.floor(375 * rate),
                  98,
                  Math.floor(100 * rate),
                  0,
                  2 * Math.PI
                );
                ctx.clip() //裁剪
                let coverImg = canvas.createImage();
                coverImg.src = video.coverImg;
                coverImg.onload = () => {
                  ctx.drawImage( //定位在圆圈范围内便会出现
                    coverImg, //图片暂存路径
                    129, 42,
                    110, 110,
                  );
                  ctx.restore()
                }
              }
            }
          }
          let peiyin = canvas.createImage();
          peiyin.src = '/static/peiyin.jpg';
          peiyin.onload = () => {
            ctx.drawImage(peiyin, 0, 211, 375, 89);
            //分享
            let fx = canvas.createImage();
            fx.src = '/static/share.png'
            fx.onload = () => {
              ctx.drawImage(fx, 12, 220, 20, 20)
              ctx.fillText('分享', 36, 238)
              // 收藏，一个一个渲染
              let sc = canvas.createImage();
              sc.src = '/static/no_collect.png'
              sc.onload = () => {
                ctx.drawImage(sc, 110, 220, 19, 19)
                ctx.fillText('收藏', 134, 238)
                //点赞
                let dz = canvas.createImage();
                dz.src = '/static/heart.png'
                dz.onload = () => {
                  ctx.drawImage(dz, 318, 222, 22, 22)
                  ctx.fillText(0, 254, 238)
                  // 评论
                  let pl = canvas.createImage();
                  pl.src = '/static/comment.png'
                  pl.onload = () => {
                    ctx.drawImage(pl, 228, 222, 22, 22)
                    ctx.fillText(0, 340, 238)
                    setTimeout(() => {
                      wx.canvasToTempFilePath({
                        canvas: canvas,
                        success(res) {
                          resolve({
                            title: '我的新作品发布啦，快来捧场点赞！',
                            path: `/pages/pkPage/index?videoId=${wx.getStorageSync('shareVideoId')}&uid=${wx.getStorageSync('uid')}`,
                            imageUrl: res.tempFilePath
                          })
                        },
                        fail(res) {
                          reject()
                        }
                      }, this)
                    }, 500)
                  }
                }
              }
            }
          }
        })
    })
  },
  onShareAppMessage({
    from,
    target
  }) {
    if (from == 'button') {
      const promise = new Promise(resolve => {
        this.creatShare().then(res => {
          resolve(res)
        })
      })
      return {
        title: '我的新作品发布啦，快来捧场点赞！',
        path: `/pages/index/index?uid=${wx.getStorageSync('uid')}`,
        imageUrl: 'http://reader-wx.ai160.com/images/reader/v3/375-300-1.jpg',
        promise
      }
    } else {
      return {
        title: '自从用了它，家里朗朗书声，美妙极了！你家孩子也快来试试！',
        path: `/pages/index/index?uid=${wx.getStorageSync('uid')}`,
        imageUrl: 'http://reader-wx.ai160.com/images/reader/v3/375-300-1.jpg'
      }
    }
  },
})