P E N C I L
Login
Form
  1. TextFormField(
    1. decoration: new InputDecoration(labelText: 'Username')
    2. controller: TextEditingController
      1. new TextEditingController and dispose it in dispose of WIdget
      2. get value by textEditingController.text
  2. Text(textScaleFactor: 2.0,))
  3. CircularProgressIndicator
  4. RaisedButton(onPressed)