当textField未聚焦时如何实现labelText形状

Question

默认情况下，当您将OutlineBorder类传递给InputDecoration并同时传递labelText时，当textField被聚焦时，您将获得此形状-> (shape)。当textField不聚焦时，如何实现相同的形状。

TextFormField(
          decoration: InputDecoration(
            labelText: "Enter Email",
            fillColor: Colors.white,
            border: OutlineInputBorder2(
              borderRadius: BorderRadius.circular(25.0),
              borderSide: BorderSide(),
            ),
            enabledBorder: OutlineInputBorder2(
              borderRadius: BorderRadius.circular(25.0),
              borderSide: BorderSide(),
            ),
            focusedBorder: OutlineInputBorder2(
              borderRadius: BorderRadius.circular(25.0),
              borderSide: BorderSide(),
            )
          ),