NormalizedOverflowBox class

A widget that imposes different constraints on its child than it gets from its parent, possibly allowing the child to overflow the parent.

A NormalizedOverflowBox is similar to an OverflowBox. The difference is that an OverflowBox may throw errors if it gets constraints which are incompatible with its own constraints. For example, if an OverflowBox is inside a container with maxWidth 100, and its own minWidth is 150, it will throw:

The following assertion was thrown during performLayout():
BoxConstraints has non-normalized width constraints.

However, the NormalizedOverflowBox will just make sure maxWidth is also 150, and throw no errors. In other words, a NormalizedOverflowBox is safer to use. In my opinion, NormalizedOverflowBox has the behavior OverflowBox should have.

See also:

• RenderConstrainedOverflowBox for details about how OverflowBox is rendered.
• SizedOverflowBox, a widget that is a specific size but passes its original constraints through to its child, which may then overflow.
• ConstrainedBox, a widget that imposes additional constraints on its child.
• UnconstrainedBox, a container that tries to let its child draw without constraints.
• SizedBox, a box with a specified size.
• The catalog of layout widgets.

Inheritance

• Object
• DiagnosticableTree
• Widget
• RenderObjectWidget
• SingleChildRenderObjectWidget
• NormalizedOverflowBox

Constructors

NormalizedOverflowBox({Key? key, AlignmentGeometry alignment = Alignment.center, double? minWidth, double? maxWidth, double? minHeight, double? maxHeight, Widget? child})

Creates a widget that lets its child overflow itself, but prevents invalid constraints.

const

Properties

alignment → AlignmentGeometry

How to align the child.

final

child → Widget?

The widget below this widget in the tree.

final, inherited

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

maxHeight → double?

The maximum height constraint to give the child. Set this to null (the default) to use the constraint from the parent instead.

final

maxWidth → double?

The maximum width constraint to give the child. Set this to null (the default) to use the constraint from the parent instead.

final

minHeight → double?

The minimum height constraint to give the child. Set this to null (the default) to use the constraint from the parent instead.

final

minWidth → double?

The minimum width constraint to give the child. Set this to null (the default) to use the constraint from the parent instead.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

createElement() → SingleChildRenderObjectElement

RenderObjectWidgets always inflate to a RenderObjectElement subclass.

inherited

createRenderObject(BuildContext context) → RenderConstrainedNormalizedOverflowBox

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.

inherited

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.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent 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 RenderConstrainedNormalizedOverflowBox 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.

inherited