calculateFixedChildSizes method

Implementation

Size calculateFixedChildSizes(ChildLayouter layoutChild)
{
  var allocatedWidth = 0.0;
  var allocatedHeight = 0.0;

  double maxChildExtent = _direction == Axis.horizontal ? constraints.maxWidth : constraints.maxHeight;

  //var idParent = model.id;

  RenderBox? child = firstChild;
  while (child != null)
  {
    // perform layout
    if (child.parentData is BoxData && (child.parentData as BoxData).model != null)
    {
      var childData = (child.parentData as BoxData);
      var childModel = childData.model!;

      //var idChild = childModel.id;

      // assign flex value
      _setChildFlex(childData, childModel);

      // layout child
      if (childData.flex == null)
      {
        // get layout constraints
        var childConstraints = _getChildLayoutConstraints(child, childModel, maxChildExtent);

        // calculate the child's size by performing
        // a dry layout. We use LocalBoxConstraints in order to
        // override isTight, which is used in Layout() to determine if a
        // child size change forces a parent to resize.
        layoutChild(child, LocalBoxConstraints.from(childConstraints));

        // set width
        allocatedWidth = _direction == Axis.horizontal ? (allocatedWidth + (child.size.width)) : max(allocatedWidth, (child.size.width));

        // set height
        allocatedHeight = _direction == Axis.horizontal ? max(allocatedHeight, (child.size.height)) : allocatedHeight + (child.size.height);
      }
    }
    // get next child
    child = childAfter(child);
  }
  return Size(allocatedWidth, allocatedHeight);
}