layoutComplete method
Implementation
void layoutComplete(Size size, Offset offset) {
// set the view width, height and position
if (size.width != viewWidth ||
size.height != viewHeight ||
offset.dx != viewX ||
offset.dy != viewY) {
viewWidth = size.width;
viewHeight = size.height;
viewX = offset.dx;
viewY = offset.dy;
}
}