padding property

EdgeInsetsGeometry padding

Padding for a button's child (typically the button's label).

Defaults to 24.0 on the left and right if textTheme is ButtonTextTheme.primary, 16.0 on the left and right otherwise.

See also:

Implementation 

EdgeInsetsGeometry get padding {
  if (_padding != null)
    return _padding;
 switch (textTheme) {
    case ButtonTextTheme.normal:
    case ButtonTextTheme.accent:
      return const EdgeInsets.symmetric(horizontal: 16.0);
    case ButtonTextTheme.primary:
     return const EdgeInsets.symmetric(horizontal: 24.0);
  }
  assert(false);
  return EdgeInsets.zero;
}