measureTarget function

MeasuredRect? measureTarget(GlobalKey<State<StatefulWidget>> key)

RN measureInstance() — measures a target's on-screen rect. Returns null if the widget is unmounted or has no size yet.

Implementation

MeasuredRect? measureTarget(GlobalKey key) {
  final context = key.currentContext;
  if (context == null) return null;
  final object = context.findRenderObject();
  if (object is! RenderBox || !object.hasSize) return null;
  final size = object.size;
  if (size.width <= 0 || size.height <= 0) return null;
  final origin = object.localToGlobal(Offset.zero);
  return MeasuredRect(
    x: origin.dx,
    y: origin.dy,
    width: size.width,
    height: size.height,
  );
}