performLayout method

@override Size performLayout(BoxConstraints constraints)

Hook for subclasses to perform layout within the given constraints.

Implementation

@override
Size performLayout(BoxConstraints constraints) {
  final canvas = widget as Canvas;
  final width = constraints.hasBoundedWidth
      ? constraints.maxWidth
      : canvas.width;
  final height = constraints.hasBoundedHeight
      ? constraints.maxHeight
      : canvas.height;
  return constraints.constrain(Size(width, height));
}