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 super.build
(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:
- AutomaticKeepAlive, which listens to messages from this mixin.
- KeepAliveNotification, the notifications sent by this mixin.
- Superclass Constraints
- State<
T>
- State<
- Implemented by
- Annotations
- @optionalTypeArgs
Constructors
Properties
- 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
Methods
-
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. [...]
override
-
initState(
) → void -
Called when this object is inserted into the tree. [...]
override
-
updateKeepAlive(
) → void -
Ensures that any AutomaticKeepAlive ancestors are in a good state, by
firing a KeepAliveNotification or triggering the KeepAliveHandle as
appropriate.
@protected
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node. [...]
inherited
-
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. [...]
inherited
-
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
toStringDeep
. [...]inherited -
toString(
{DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String -
Returns a string representation of this object.
inherited
-
toStringShort(
) → String -
A brief description of this object, usually just the runtimeType and the
hashCode. [...]
inherited
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
inherited