layout method
void
layout(
- Context context,
- BoxConstraints constraints, {
- bool parentUsesSize = false,
override
First widget pass to calculate the children layout and bounding box
Implementation
@override
void layout(Context context, BoxConstraints constraints,
{bool parentUsesSize = false}) {
final resolvedPadding = padding.resolve(Directionality.of(context));
if (child != null) {
final childConstraints = constraints.deflate(resolvedPadding);
child!.layout(context, childConstraints, parentUsesSize: parentUsesSize);
assert(child!.box != null);
box = constraints.constrainRect(
width: child!.box!.width + resolvedPadding.horizontal,
height: child!.box!.height + resolvedPadding.vertical);
} else {
box = constraints.constrainRect(
width: resolvedPadding.horizontal, height: resolvedPadding.vertical);
}
}