import image from '@ohos.multimedia.image';

@Entry
@Component
struct ImageEdit{
  @State imagePixelMap:PixelMap = undefined
  @State edit:boolean = false

  @Builder buttonModel($$:{textContent,action}){
    Button($$.textContent)
      .fontSize(14)
      .height(30)
      .width(60)
      .borderRadius(10)
      .backgroundColor('#E8A027')
      .onClick(()=>{
        $$.action
        this.edit = true
      })
  }

  async get_pixelmap(){
    // 获取resourceManager资源管理
    const context = getContext(this)
    const resourceMgr = context.resourceManager
    // 获取rawfile文件夹下httpimage.PNG的ArrayBuffer
    const fileData = await resourceMgr.getMediaContent($r('app.media.httpimage'))
    const buffer = fileData.buffer
    // 创建imageSource
    const imageSource = image.createImageSource(buffer)
    // 创建PixelMap
    const pixelMap = await imageSource.createPixelMap()
    return pixelMap
  }

  // 对pixelMap进行裁剪
  async crop_image(){
    let pixelMap = await this.get_pixelmap()
    pixelMap.crop({x:0,y:0,size:{height:300,width:300}})
    this.imagePixelMap = pixelMap
  }

  // 对pixelMap进行缩放
  async scale_image(){
    let pixelMap = await this.get_pixelmap()
    pixelMap.scale(0.5,0.5)
    this.imagePixelMap = pixelMap
  }

  // 对pixelMap进行偏移
  async translate_image(){
    let pixelMap = await this.get_pixelmap()
    pixelMap.translate(100,100);
    this.imagePixelMap = pixelMap
  }

  // 对pixelMap进行旋转
  async rotate_image(){
    let pixelMap = await this.get_pixelmap()
    pixelMap.rotate(90);
    this.imagePixelMap = pixelMap
  }

  // 对pixelMap进行翻转
  async flip_image(){
    let pixelMap = await this.get_pixelmap()
    pixelMap.flip(false, true);
    this.imagePixelMap = pixelMap
  }

  // 对pixelMap进行透明度调整
  async opacity_image(){
    let pixelMap = await this.get_pixelmap()
    pixelMap.opacity(0.5);
    this.imagePixelMap = pixelMap
  }

  build(){
    Column(){
      if(!this.edit){
        Row(){
          Image($r('app.media.httpimage')).objectFit(ImageFit.None)
        }.width('100%').height('50%').backgroundColor('#F0F0F0')
      }else{
        Row(){
          // 将编辑好的pixelMap传递给状态变量imagePixelMap后，通过Image组件进行渲染
          Image(this.imagePixelMap).objectFit(ImageFit.None)
        }.width('100%').height('50%').backgroundColor('#F0F0F0')
      }

      Flex({wrap:FlexWrap.Wrap,justifyContent:FlexAlign.SpaceEvenly}){
        this.buttonModel({textContent:'裁剪',action:this.crop_image()})
        this.buttonModel({textContent:'缩放',action:this.scale_image()})
        this.buttonModel({textContent:'偏移',action:this.translate_image()})
        this.buttonModel({textContent:'旋转',action:this.rotate_image()})
        this.buttonModel({textContent:'翻转',action:this.flip_image()})
        this.buttonModel({textContent:'透明度',action:this.opacity_image()})
        Button('还原')
          .fontSize(14)
          .height(30)
          .width(60)
          .borderRadius(10)
          .margin({top:20})
          .backgroundColor('#A4AE77')
          .onClick(()=>{
            this.edit = false
          })
      }
      .margin({top:100})
      .height('100%')
      .width('100%')
    }
    .height('100%')
    .width('100%')
  }
}
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