ExpansionTile constructor

const ExpansionTile(
  1. {Key key,
  2. Widget leading,
  3. @required Widget title,
  4. Widget subtitle,
  5. Color backgroundColor,
  6. ValueChanged<bool> onExpansionChanged,
  7. List<Widget> children: const [],
  8. Widget trailing,
  9. bool initiallyExpanded: false}
)

Creates a single-line ListTile with a trailing button that expands or collapses the tile to reveal or hide the children. The initiallyExpanded property must be non-null.

Implementation

const ExpansionTile({
  Key key,
  this.leading,
  @required this.title,
  this.subtitle,
  this.backgroundColor,
  this.onExpansionChanged,
  this.children = const <Widget>[],
  this.trailing,
  this.initiallyExpanded = false,
}) : assert(initiallyExpanded != null),
     super(key: key);