WidgetsApp class Null safety

A convenience widget that wraps a number of widgets that are commonly required for an application.

One of the primary roles that WidgetsApp provides is binding the system back button to popping the Navigator or quitting the application.

It is used by both MaterialApp and CupertinoApp to implement base functionality for an app.

Builds a MediaQuery using MediaQuery.fromWindow. To use an inherited MediaQuery instead, set useInheritedMediaQuery to true.

Find references to many of the widgets that WidgetsApp wraps in the "See also" section.

See also:

Inheritance

Constructors

WidgetsApp({Key? key, GlobalKey<NavigatorState>? navigatorKey, RouteFactory? onGenerateRoute, InitialRouteListFactory? onGenerateInitialRoutes, RouteFactory? onUnknownRoute, List<NavigatorObserver> navigatorObservers = const <NavigatorObserver>[], String? initialRoute, PageRouteFactory? pageRouteBuilder, Widget? home, Map<String, WidgetBuilder> routes = const <String, WidgetBuilder>{}, TransitionBuilder? builder, String title = '', GenerateAppTitle? onGenerateTitle, TextStyle? textStyle, required Color color, Locale? locale, Iterable<LocalizationsDelegate>? localizationsDelegates, LocaleListResolutionCallback? localeListResolutionCallback, LocaleResolutionCallback? localeResolutionCallback, Iterable<Locale> supportedLocales = const <Locale>[Locale('en', 'US')], bool showPerformanceOverlay = false, bool checkerboardRasterCacheImages = false, bool checkerboardOffscreenLayers = false, bool showSemanticsDebugger = false, bool debugShowWidgetInspector = false, bool debugShowCheckedModeBanner = true, InspectorSelectButtonBuilder? inspectorSelectButtonBuilder, Map<ShortcutActivator, Intent>? shortcuts, Map<Type, Action<Intent>>? actions, String? restorationScopeId, bool useInheritedMediaQuery = false})
Creates a widget that wraps a number of widgets that are commonly required for an application.
WidgetsApp.router({Key? key, RouteInformationProvider? routeInformationProvider, RouteInformationParser<Object>? routeInformationParser, RouterDelegate<Object>? routerDelegate, RouterConfig<Object>? routerConfig, BackButtonDispatcher? backButtonDispatcher, TransitionBuilder? builder, String title = '', GenerateAppTitle? onGenerateTitle, TextStyle? textStyle, required Color color, Locale? locale, Iterable<LocalizationsDelegate>? localizationsDelegates, LocaleListResolutionCallback? localeListResolutionCallback, LocaleResolutionCallback? localeResolutionCallback, Iterable<Locale> supportedLocales = const <Locale>[Locale('en', 'US')], bool showPerformanceOverlay = false, bool checkerboardRasterCacheImages = false, bool checkerboardOffscreenLayers = false, bool showSemanticsDebugger = false, bool debugShowWidgetInspector = false, bool debugShowCheckedModeBanner = true, InspectorSelectButtonBuilder? inspectorSelectButtonBuilder, Map<ShortcutActivator, Intent>? shortcuts, Map<Type, Action<Intent>>? actions, String? restorationScopeId, bool useInheritedMediaQuery = false})
Creates a WidgetsApp that uses the Router instead of a Navigator.

Properties

actions Map<Type, Action<Intent>>?
The default map of intent keys to actions for the application.
final
backButtonDispatcher BackButtonDispatcher?
A delegate that decide whether to handle the Android back button intent.
final
builder TransitionBuilder?
A builder for inserting widgets above the Navigator or - when the WidgetsApp.router constructor is used - above the Router but below the other widgets created by the WidgetsApp widget, or for replacing the Navigator/Router entirely.
final
checkerboardOffscreenLayers bool
Checkerboards layers rendered to offscreen bitmaps.
final
checkerboardRasterCacheImages bool
Checkerboards raster cache images.
final
color Color
The primary color to use for the application in the operating system interface.
final
debugShowCheckedModeBanner bool
Turns on a little "DEBUG" banner in debug mode to indicate that the app is in debug mode. This is on by default (in debug mode), to turn it off, set the constructor argument to false. In release mode this has no effect.
final
debugShowWidgetInspector bool
Turns on an overlay that enables inspecting the widget tree.
final
hashCode int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
home Widget?
The widget for the default route of the app (Navigator.defaultRouteName, which is /).
final
initialRoute String?
The name of the first route to show, if a Navigator is built.
final
inspectorSelectButtonBuilder InspectorSelectButtonBuilder?
Builds the widget the WidgetInspector uses to switch between view and inspect modes.
final
key Key?
Controls how one widget replaces another widget in the tree.
finalinherited
locale Locale?
The initial locale for this app's Localizations widget is based on this value.
final
localeListResolutionCallback LocaleListResolutionCallback?
This callback is responsible for choosing the app's locale when the app is started, and when the user changes the device's locale.
final
localeResolutionCallback LocaleResolutionCallback?
This callback is responsible for choosing the app's locale when the app is started, and when the user changes the device's locale.
final
localizationsDelegates Iterable<LocalizationsDelegate>?
The delegates for this app's Localizations widget.
final
A key to use when building the Navigator.
final
The list of observers for the Navigator created for this app.
final
onGenerateInitialRoutes InitialRouteListFactory?
The routes generator callback used for generating initial routes if initialRoute is provided.
final
onGenerateRoute RouteFactory?
The route generator callback used when the app is navigated to a named route.
final
onGenerateTitle GenerateAppTitle?
If non-null this callback function is called to produce the app's title string, otherwise title is used.
final
onUnknownRoute RouteFactory?
Called when onGenerateRoute fails to generate a route, except for the initialRoute.
final
pageRouteBuilder PageRouteFactory?
The PageRoute generator callback used when the app is navigated to a named route.
final
restorationScopeId String?
The identifier to use for state restoration of this app.
final
routeInformationParser RouteInformationParser<Object>?
A delegate to parse the route information from the routeInformationProvider into a generic data type to be processed by the routerDelegate at a later stage.
final
routeInformationProvider RouteInformationProvider?
A object that provides route information through the RouteInformationProvider.value and notifies its listener when its value changes.
final
routerConfig RouterConfig<Object>?
An object to configure the underlying Router.
final
routerDelegate RouterDelegate<Object>?
A delegate that configures a widget, typically a Navigator, with parsed result from the routeInformationParser.
final
routes Map<String, WidgetBuilder>?
The application's top-level routing table.
final
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited
shortcuts Map<ShortcutActivator, Intent>?
The default map of keyboard shortcuts to intents for the application.
final
showPerformanceOverlay bool
Turns on a performance overlay.
final
showSemanticsDebugger bool
Turns on an overlay that shows the accessibility information reported by the framework.
final
supportedLocales Iterable<Locale>
The list of locales that this app has been localized for.
final
textStyle TextStyle?
The default text style for Text in the application.
final
title String
A one-line description used by the device to identify the app for the user.
final
useInheritedMediaQuery bool
If true, an inherited MediaQuery will be used. If one is not available, or this is false, one will be built from the window.
final

Methods

createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() State<WidgetsApp>
Creates the mutable state for this widget at a given location in the tree.
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.
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">@nonVirtualinherited

Static Properties

debugAllowBannerOverride bool
If false, prevents the debug banner from being visible.
read / write
debugShowWidgetInspectorOverride bool
If true, forces the widget inspector to be visible.
read / write
defaultActions Map<Type, Action<Intent>>
The default value of WidgetsApp.actions.
read / write
defaultShortcuts Map<ShortcutActivator, Intent>
Generates the default shortcut key bindings based on the defaultTargetPlatform.
read-only
showPerformanceOverlayOverride bool
If true, forces the performance overlay to be visible in all instances.
read / write