layout method

void layout(
  1. LayoutConstraints constraints, {
  2. bool parentUsesSize = false,
})

Lays out this box with the given constraints.

The parentUsesSize parameter indicates whether the parent's layout depends on this box's size. This affects relayout boundary determination.

Implementation

void layout(LayoutConstraints constraints, {bool parentUsesSize = false}) {
  _isRelayoutBoundary =
      !parentUsesSize ||
      sizedByParent ||
      constraints.isTight ||
      parent == null;
  if (!_needsLayout && constraints == _constraints) {
    return;
  }
  _constraints = constraints;
  if (sizedByParent) {
    performResize();
  }
  performLayout();
  _needsLayout = false;
}