AutomaticKeepAliveClientMixin<T extends StatefulWidget> mixin Null safety

A mixin with convenience methods for clients of AutomaticKeepAlive. Used with State subclasses.

Subclasses must implement wantKeepAlive, and their build methods must call super.build (though the return value should be ignored).

Then, whenever wantKeepAlive's value changes (or might change), the subclass should call updateKeepAlive.

The type argument T is the type of the StatefulWidget subclass of the State into which this class is being mixed.

See also:

Superclass Constraints
Mixin Applications
Annotations

Properties

wantKeepAlive → bool
Whether the current instance should be kept alive.
protected">@protectedread-only
widget → T
The current configuration.
read-onlyinherited
context → BuildContext
The location in the tree where this widget builds.
read-onlyinherited
mounted → bool
Whether this State object is currently in a tree.
read-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

activate() → void
Called when this object is reinserted into the tree after having been removed via deactivate.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
mustCallSuper">@mustCallSuperoverride
deactivate() → void
Called when this object is removed from the tree.
override
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
didChangeDependencies() → void
Called when a dependency of this State object changes.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
didUpdateWidget(covariant T oldWidget) → void
Called whenever the widget configuration changes.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
dispose() → void
Called when this object is removed from the tree permanently.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
initState() → void
Called when this object is inserted into the tree.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
reassemble() → void
Called whenever the application is reassembled during debugging, for example during hot reload.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
setState(VoidCallback fn) → void
Notify the framework that the internal state of this object has changed.
protected">@protectedinherited
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
toStringShort() → String
A brief description of this object, usually just the runtimeType and the hashCode.
inherited
updateKeepAlive() → void
Ensures that any AutomaticKeepAlive ancestors are in a good state, by firing a KeepAliveNotification or triggering the KeepAliveHandle as appropriate.
protected">@protected

Operators

operator ==(Object other) → bool
The equality operator.
inherited