class SimpleBackButton extends StatelessWidget {
  const SimpleBackButton({
     Key key,
     this.color,
     this.icon,
     this.onPressed,

    }) : super(key: key);

  /// The color to use for the icon.
  ///
  /// Defaults to the [IconThemeData.color] specified in the ambient [IconTheme],
  /// which usually matches the ambient [Theme]'s [ThemeData.iconTheme].
  final Color color;
  final Widget icon;
  final VoidCallback onPressed;

  @override
  Widget build(BuildContext context) {
    assert(debugCheckHasMaterialLocalizations(context));
    return IconButton(
      icon: icon ?? const BackButtonIcon(),
      color: color,
      tooltip: MaterialLocalizations.of(context).backButtonTooltip,
      onPressed: () {
        if (onPressed == null) {
          Navigator.maybePop(context);
        } else {
          onPressed();
        }
      },
    );
  }
}