PrototypeConstrainedBox class final

A widget that imposes additional constraints on its child, based on a prototype.

For example, if you wanted child to be constrained to the exact size of a text, you could do:

const PrototypeConstrainedBox.tight(
  prototype: Text('Lorem ipsum dolor'),
  child: ColoredBox(
    color: Color(0xFFFF0000),
  ),
);

See also:

Inheritance

Constructors

PrototypeConstrainedBox({Key? key, required Widget prototype, required Widget? child, bool constrainMinWidth = false, bool constrainMaxWidth = false, bool constrainMinHeight = false, bool constrainMaxHeight = false})
Creates a widget that imposes the prototype constraints on its child.
const
PrototypeConstrainedBox.loose({Key? key, required Widget prototype, required Widget? child})
Constrains the given child to forbid it to be larger than prototype.
const
PrototypeConstrainedBox.tight({Key? key, required Widget prototype, required Widget? child})
Constrains the given child to have the exact same size as prototype.
const
PrototypeConstrainedBox.tightFor({Key? key, bool width = false, bool height = false, required Widget prototype, required Widget? child})
Constrains the given child to have the exact same size as prototype.
const

Properties

child → Widget?
The widget below this widget in the tree.
final
constrainMaxHeight → bool
final
constrainMaxWidth → bool
final
constrainMinHeight → bool
final
constrainMinWidth → bool
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
prototype → Widget
The widget whose constraints are going to be imposed in child.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → RenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
override
createRenderObject(BuildContext context) → RenderObject
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 RenderPrototypeConstrainedBox 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