AutomaticKeepAliveClientMixin<T extends StatefulWidget> mixin

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

Subclasses must implement wantKeepAlive, and their build methods must call (the return value will always return null, and 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
Implemented by
  • @optionalTypeArgs




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


build(BuildContext context) Widget
Describes the part of the user interface represented by this widget. [...]
@mustCallSuper, override
deactivate() → void
Called when this object is removed from the tree. [...]
initState() → void
Called when this object is inserted into the tree. [...]
updateKeepAlive() → void
Ensures that any AutomaticKeepAlive ancestors are in a good state, by firing a KeepAliveNotification or triggering the KeepAliveHandle as appropriate.
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
didChangeDependencies() → void
Called when a dependency of this State object changes. [...]
@mustCallSuper, @protected, inherited
didUpdateWidget(covariant T oldWidget) → void
Called whenever the widget configuration changes. [...]
@mustCallSuper, @protected, inherited
dispose() → void
Called when this object is removed from the tree permanently. [...]
@mustCallSuper, @protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
reassemble() → void
Called whenever the application is reassembled during debugging, for example during hot reload. [...]
@mustCallSuper, @protected, inherited
setState(VoidCallback fn) → void
Notify the framework that the internal state of this object has changed. [...]
@protected, inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a string representation of this object.
toStringShort() String
A brief description of this object, usually just the runtimeType and the hashCode.


operator ==(dynamic other) bool
The equality operator. [...]