constraintsTransform property

BoxConstraintsTransform get constraintsTransform

The function used to transform the incoming BoxConstraints, to size child.

The function must return a BoxConstraints that is BoxConstraints.isNormalized.

See ConstraintsTransformBox for predefined common BoxConstraintsTransforms.

Implementation

BoxConstraintsTransform get constraintsTransform => _constraintsTransform;
set constraintsTransform (BoxConstraintsTransform value)

Implementation

set constraintsTransform(BoxConstraintsTransform value) {
  if (_constraintsTransform == value) {
    return;
  }
  _constraintsTransform = value;
  // The RenderObject only needs layout if the new transform maps the current
  // `constraints` to a different value, or the render object has never been
  // laid out before.
  final bool needsLayout = _childConstraints == null || _childConstraints != value(constraints);
  if (needsLayout) {
    markNeedsLayout();
  }
}