Visibility constructor
Control whether the given child
is visible
.
The child
and replacement
arguments must not be null.
The boolean arguments must not be null.
The maintainSemantics
and maintainInteractivity
arguments can only be
set if maintainSize
is set.
The maintainSize
argument can only be set if maintainAnimation
is set.
The maintainAnimation
argument can only be set if maintainState
is set.
Implementation
const Visibility({
Key key,
@required this.child,
this.replacement = const SizedBox.shrink(),
this.visible = true,
this.maintainState = false,
this.maintainAnimation = false,
this.maintainSize = false,
this.maintainSemantics = false,
this.maintainInteractivity = false,
}) : assert(child != null),
assert(replacement != null),
assert(visible != null),
assert(maintainState != null),
assert(maintainAnimation != null),
assert(maintainSize != null),
assert(maintainState == true || maintainAnimation == false, 'Cannot maintain animations if the state is not also maintained.'),
assert(maintainAnimation == true || maintainSize == false, 'Cannot maintain size if animations are not maintained.'),
assert(maintainSize == true || maintainSemantics == false, 'Cannot maintain semantics if size is not maintained.'),
assert(maintainSize == true || maintainInteractivity == false, 'Cannot maintain interactivity if size is not maintained.'),
super(key: key);