Modifier class

Original idea and source code by @remi_rousselet

A widget that simplify the writing of deeply Modifier widget trees.

It relies on the new kind of widget SingleChildModifier, which has two concrete implementations:

• SingleChildStatelessModifier
• SingleChildStatefulModifier

They are both respectively a SingleChildModifier variant of StatelessWidget and StatefulWidget.

The difference between a widget and its single-child variant is that they have a custom build method that takes an extra parameter.

As such, a StatelessWidget would be:

class MyWidget extends StatelessWidget {
  MyWidget({Key key, this.child}): super(key: key);

  final Widget child;

  @override
  Widget build(BuildContext context) {
    return SomethingWidget(child: child);
  }
}

Whereas a SingleChildStatelessModifier would be:

class MyWidget extends SingleChildStatelessWidget {
  MyWidget({Key key, Widget child}): super(key: key, child: child);

  @override
  Widget buildWithChild(BuildContext context, Widget child) {
    return SomethingWidget(child: child);
  }
}

This allows our new MyWidget to be used both with:

MyWidget(
  child: AnotherWidget(),
)

and to be placed inside children of Modifier like so:

Modifier(
  modifiers: [
    MyWidget(),
    ...
  ],
  child: AnotherWidget(),
)

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• Modifier

Implemented types

• SingleChildModifier

Mixed-in types

• ModifierManager

Available extensions

• ModifierTransformer

Constructors

Modifier({Key? key, required List<SingleChildModifier> modifiers, Widget? child})

Allows configuring key, children and child

Properties

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

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

build(BuildContext context) → Widget

Describes the part of the user interface represented by this widget.

override

createElement() → _ModifierElement

Create modifier stateless element

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.

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

wrapWith(SingleChildModifier modifier) → Modifier

Wrap current child widget with a SingleChildModifier

override

wrapWithAll(List<SingleChildModifier> modifiers) → Modifier

Wrap current child widget with a SingleChildModifiers list

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited