Tooltip constructor

const Tooltip({Key key, @required String message, double height: 32.0, EdgeInsetsGeometry padding: const EdgeInsets.symmetric(horizontal: 16.0), double verticalOffset: 24.0, bool preferBelow: true, bool excludeFromSemantics: false, Widget child })

Creates a tooltip.

By default, tooltips prefer to appear below the child widget when the user long presses on the widget.

The message argument must not be null.

Implementation 

const Tooltip({
  Key key,
  @required this.message,
  this.height = 32.0,
  this.padding = const EdgeInsets.symmetric(horizontal: 16.0),
  this.verticalOffset = 24.0,
  this.preferBelow = true,
  this.excludeFromSemantics = false,
  this.child,
}) : assert(message != null),
     assert(height != null),
     assert(padding != null),
     assert(verticalOffset != null),
     assert(preferBelow != null),
     assert(excludeFromSemantics != null),
     super(key: key);