LimitedBox class Null safety

A box that limits its size only when it's unconstrained.

If this widget's maximum width is unconstrained then its child's width is limited to maxWidth. Similarly, if this widget's maximum height is unconstrained then its child's height is limited to maxHeight.

This has the effect of giving the child a natural dimension in unbounded environments. For example, by providing a maxHeight to a widget that normally tries to be as big as possible, the widget will normally size itself to fit its parent, but when placed in a vertical list, it will take on the given height.

This is useful when composing widgets that normally try to match their parents' size, so that they behave reasonably in lists (which are unbounded).

See also:

  • ConstrainedBox, which applies its constraints in all cases, not just when the incoming constraints are unbounded.
  • SizedBox, which lets you specify tight constraints by explicitly specifying the height or width.
  • The catalog of layout widgets.
Inheritance

Constructors

LimitedBox({Key? key, double maxWidth = double.infinity, double maxHeight = double.infinity, Widget? child})
Creates a box that limits its size only when it's unconstrained.
const

Properties

child → Widget?
The widget below this widget in the tree.
finalinherited
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
maxHeight → double
The maximum height limit to apply in the absence of a BoxConstraints.maxHeight constraint.
final
maxWidth → double
The maximum width limit to apply in the absence of a BoxConstraints.maxWidth constraint.
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

createElement() → SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
createRenderObject(BuildContext context) → RenderLimitedBox
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
override
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
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
protected">@protectedinherited
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
updateRenderObject(BuildContext context, covariant RenderLimitedBox renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.
override

Operators

operator ==(Object other) → bool
The equality operator.
nonVirtual">@nonVirtualinherited