Flutter textfield that auto expands when text is entered and then starts scrolling the text when a certain height is reached

Question

I\'ve tried many configurations of the Flutter TextField but can\'t figure out how to build this one.

I\'m looking for a textfield that is a single line initially an

Answer 1

Container(
    child: new ConstrainedBox(
        constraints: BoxConstraints(
            maxHeight: 300.0,
        ),
        child: TextField(
                    maxLines: null,
                ),
            ),
        ),
    ),
)

In older Flutter versions it was

Container(
    child: new ConstrainedBox(
        constraints: BoxConstraints(
            maxHeight: 300.0,
        ),
        child: new Scrollbar(
            child: new SingleChildScrollView(
                scrollDirection: Axis.vertical,
                reverse: true,
                child: new TextField(
                    maxLines: null,
                ),
            ),
        ),
    ),
)