bottom sheet with initial height half of screen and if it scroll then height is increase to full screen

Question

I have a bottom sheet with below code in where i put a height 300.0 but I want increase height to full screen when user scroll ..how can i do that ..please

void _showBottomSheet() {
    setState(() {
      _showPersBottomSheetCallBack = null;
    });

    _scaffoldKey.currentState
        .showBottomSheet((context) {
      return new Container(
        height: 300.0,
        color: Colors.greenAccent,
        child: new Center(
          child: new Text("Hi BottomSheet"),
        ),
      );
    })
        .closed
        .whenComplete(() {
      if (mounted) {
        setState(() {
          _showPersBottomSheetCallBack = _showBottomSheet;
        });
      }
    });
  }

Answer 1

The flutter package bottom sheet is not meant to occupy the full screen, though a little tweak can produce the behavior you expect. If you look at the BottomSheet constructor, you will find the following:

  @override
  BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
    return new BoxConstraints(
      minWidth: constraints.maxWidth,
      maxWidth: constraints.maxWidth,
      minHeight: 0.0,
      maxHeight: constraints.maxHeight * 9.0 / 16.0
    );
  }

If you remove the 9.0/16.0 height constraint, the bottom sheet will occupy the full screen height.