FlagProperty constructor
Constructs a FlagProperty with the given descriptions with the specified descriptions.
showName defaults to false as typically ifTrue and ifFalse should
be descriptions that make the property name redundant.
The showName and level arguments must not be null.
Implementation
FlagProperty(String name, {
@required bool value,
this.ifTrue,
this.ifFalse,
bool showName = false,
Object defaultValue,
DiagnosticLevel level = DiagnosticLevel.info,
}) : assert(showName != null),
assert(level != null),
assert(ifTrue != null || ifFalse != null),
super(
name,
value,
showName: showName,
defaultValue: defaultValue,
level: level,
);