UnconstrainedBox class Null safety
A widget that imposes no constraints on its child, allowing it to render at its "natural" size.
This allows a child to render at the size it would render if it were alone on an infinite canvas with no constraints. This container will then attempt to adopt the same size, within the limits of its own constraints. If it ends up with a different size, it will align the child based on alignment. If the box cannot expand enough to accommodate the entire child, the child will be clipped.
In debug mode, if the child overflows the container, a warning will be printed on the console, and black and yellow striped areas will appear where the overflow occurs.
See also:
- ConstrainedBox, for a box which imposes constraints on its child.
- Align, which loosens the constraints given to the child rather than removing them entirely.
- Container, a convenience widget that combines common painting, positioning, and sizing widgets.
- OverflowBox, a widget that imposes different constraints on its child than it gets from its parent, possibly allowing the child to overflow the parent.
- ConstraintsTransformBox, a widget that sizes its child using a transformed BoxConstraints, and shows a warning if the child overflows in debug mode.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- UnconstrainedBox
Constructors
- UnconstrainedBox({Key? key, Widget? child, TextDirection? textDirection, AlignmentGeometry alignment = Alignment.center, Axis? constrainedAxis, Clip clipBehavior = Clip.none})
-
Creates a widget that imposes no constraints on its child, allowing it to
render at its "natural" size. If the child overflows the parents
constraints, a warning will be given in debug mode.
const
Properties
- alignment → AlignmentGeometry
-
The alignment to use when laying out the child.
final
- child → Widget?
-
The widget below this widget in the tree.
final
- clipBehavior → Clip
-
The content will be clipped (or not) according to this option.
final
- constrainedAxis → Axis?
-
The axis to retain constraints on, if any.
final
- hashCode → int
- The hash code for this object.
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- textDirection → TextDirection?
-
The text direction to use when interpreting the alignment if it is an
AlignmentDirectional.
final
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.protected">@protectedinherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited