getOffset abstract method
- ScaffoldPrelayoutGeometry scaffoldGeometry
This uses a ScaffoldPrelayoutGeometry, which the Scaffold constructs during its layout phase after it has laid out every widget it can lay out except the FloatingActionButton. The Scaffold uses the Offset returned from this method to position the FloatingActionButton and complete its layout.
Offset getOffset(ScaffoldPrelayoutGeometry scaffoldGeometry);