onLayout method

Implementation

@override
void onLayout(double left, double top, double right, double bottom) {
  double topMargin = 0;
  double leftMargin = 0;
  double rightMargin = 0;
  double bottomMargin = 0;
  _xMap.forEach((key, value) {
    if (Align2.start == value.axis.position) {
      topMargin = max(topMargin, value.axisSize.rect.height);
    } else {
      bottomMargin = max(bottomMargin, value.axisSize.rect.height);
    }
  });

  _yMap.forEach((key, value) {
    if (Align2.end == value.axis.position) {
      rightMargin = max(rightMargin, value.axisSize.rect.width);
    } else {
      leftMargin = max(leftMargin, value.axisSize.rect.width);
    }
  });

  _xMap.forEach((key, value) {
    List<DynamicData> dl = [];
    for (var ele in value.children) {
      dl.addAll(ele.xDataSet);
    }
    LineProps layoutProps;
    if (value.axis.position == Align2.start) {
      Offset start = Offset(leftMargin, topMargin);
      Offset end = Offset(width - rightMargin, topMargin);
      layoutProps = LineProps(Rect.zero, start, end);
    } else {
      Offset start = Offset(leftMargin, height - bottomMargin);
      Offset end = Offset(width - rightMargin, height - bottomMargin);
      layoutProps = LineProps(Rect.zero, start, end);
    }
    value.layout(layoutProps, dl);
  });

  _yMap.forEach((key, value) {
    List<DynamicData> dl = [];
    for (var ele in value.children) {
      dl.addAll(ele.yDataSet);
    }
    LineProps layoutProps;
    if (value.axis.position == Align2.end) {
      Offset start = Offset(width - rightMargin, topMargin);
      Offset end = Offset(width - rightMargin, height - bottomMargin);
      layoutProps = LineProps(Rect.zero, start, end);
    } else {
      Offset start = Offset(0, topMargin);
      Offset end = Offset(0, height - bottomMargin);
      layoutProps = LineProps(Rect.zero, start, end);
    }
    value.layout(layoutProps, dl);
  });

  for (var element in children) {
    element.layout(leftMargin, topMargin, element.width - rightMargin, element.height - bottomMargin);
  }
}