ScaleChangedModel constructor

ScaleChangedModel({ double scale = 1.0, Offset offset = Offset.zero, Size size = Size.zero, Offset focalOffset = Offset.zero, Offset preFocalOffset = Offset.zero, double currentScale = 1.0, })

Implementation

ScaleChangedModel({this.scale=1.0, this.offset=Offset.zero, this.size=Size.zero, this.focalOffset=Offset.zero, this. preFocalOffset=Offset.zero, double currentScale=1.0}) {
  Offset offset = this.offset;
  double dx = offset.dx;
  double dy = offset.dy;

  Size size = this.size;
  if (size != null) {
    double width = size.width;
    int move = (width + dx.abs()).toInt();
    int imagWidth = (width * scale).toInt();
    print("dx $dx  move $move  imagWidth$imagWidth");
    ///放大的图像是否滑动到了右边界
    if (move == imagWidth) {
      this.isRightBorder = true;
    } else {
      this.isRightBorder = false;
    }
    ///放大的图像是否滑动到了左边界
    if (dx == 0) {
      this. isLeftBorder = true;
    } else {
      this.isLeftBorder = false;
    }
  }

  if(preFocalOffset!=null&&focalOffset!=null &&currentScale==1.0){

    double preDx = preFocalOffset.dx;
    double preDy = preFocalOffset.dy;

    double focalDx = focalOffset.dx;
    double focalDy = focalOffset.dy;

    double flagDx = focalDx - preDx;

    double flagDy = focalDy - preDy;

    if(flagDx<0){
      currentHorizontalSlideDirectionType = SlideDirectionType.tooRight;
    }else{
      currentHorizontalSlideDirectionType = SlideDirectionType.toLeft;
    }

    if(flagDy<0){
      currentVerticalSlideDirectionType = SlideDirectionType.toBottom;
    }else{
      currentVerticalSlideDirectionType = SlideDirectionType.toTop;
    }

    // print("currentVerticalSlideDirectionType $currentVerticalSlideDirectionType  currentHorizontalSlideDirectionType $currentHorizontalSlideDirectionType");
  }else{
    currentVerticalSlideDirectionType = SlideDirectionType.none;
    currentHorizontalSlideDirectionType = SlideDirectionType.none;
  }


}