Anchor floating action button to Card

Question

When creating a Card (for example using the code from the Docs) , how can I anchor a FAB to the Card (the green circle in the image below), like in this question for Android.

I saw a similar question for attaching a FAB to the AppBar, but the solution relies on the AppBar being a fixed height. When using a Card, the height isn't fixed ahead of time so the same solution can't be used.

Answer 1

You can place the FloatingActionButton in an Align widget and play with the heightFactor property.

For example:

class MyCard extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Card(
      child: Column(
        children: <Widget>[
          SizedBox(height: 100.0, width: double.infinity),
          Align(
            alignment: Alignment(0.8, -1.0),
            heightFactor: 0.5,
            child: FloatingActionButton(
              onPressed: null,
              child: Icon(Icons.add),
            ),
          )
        ],
      ),
    );
  }
}