MessageSnackbarListener class Null safety

A listener for ChangeNotifier that extends MessageNotifierMixin mixin Wrapping a widget with MessageListener will use Scaffold.context to show Snackbars called from the ChangeNotifier class with notifyError or notifyInfo methods Useful to display error or information messages

As an example:

ChangeNotifierProvider.value(
  value: _model,
  child: Scaffold(
   appBar: AppBar(),
   body: MessageListener<Model>(
      child: ListView()
   )
  )
);
Inheritance

Constructors

MessageSnackbarListener({Key? key, required Widget child, required ProviderBase provider, String? errorExtractor(dynamic)?, String? infoExtractor(dynamic)?, void onError(String error)?, void onErrorTap()?, String errorActionLabel = 'Segnala', Color errorActionLabelColor = Colors.white, Color errorBackgroundColor = Colors.red, Widget errorLeading = const Icon(Icons.error, color: Colors.white), void onInfo(String info)?, void onInfoTap()?, String infoActionLabel = 'Info', Color infoActionLabelColor = Colors.white, Color infoBackgroundColor = Colors.lightBlue, Widget infoLeading = const Icon(Icons.info, color: Colors.white), Duration snackBarDisplayTime = const Duration(milliseconds: 4000)})
const

Properties

child Widget
final
errorActionLabel String
Customize error SnackBar action label
final
errorActionLabelColor Color
Customize error SnackBar action color
final
errorBackgroundColor Color
Customize error SnackBar background color default to Colors.red600
final
errorExtractor → (String? Function?(dynamic)?)
final
errorLeading Widget
Customize error SnackBar leading icon default to Icons.error
final
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
infoActionLabel String
Customize info SnackBar action label
final
infoActionLabelColor Color
Customize info SnackBar action color
final
infoBackgroundColor Color
Customize info SnackBar background color default to Colors.lightBlue
final
infoExtractor → (String? Function?(dynamic)?)
final
infoLeading Widget
Customize info SnackBar leading default to Icons.info
final
key Key?
Controls how one widget replaces another widget in the tree.
final, inherited
onError → (void Function?(String error)?)
Additional function that can be called when an error message occur
final
onErrorTap → (void Function?()?)
if onErrorTap is not null an action will be added to the SnackBar when an error message occur
final
onInfo → (void Function?(String info)?)
Additional function that can be called when an info message occur
final
onInfoTap → (void Function?()?)
if onInfoTap is not null an action will be added to the SnackBar when an info message occur
final
provider ProviderBase
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
snackBarDisplayTime Duration
SnackBar duration default is Duration(milliseconds: 4000)
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, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
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, inherited