ScrollNotificationObserverState class Null safety
The listener list state for a ScrollNotificationObserver returned by ScrollNotificationObserver.of.
ScrollNotificationObserver is similar to NotificationListener. It supports a listener list instead of just a single listener and its listeners run unconditionally, they do not require a gating boolean return value.
- Inheritance
-
- Object
- State<
ScrollNotificationObserver> - ScrollNotificationObserverState
Constructors
Properties
- context → BuildContext
-
The location in the tree where this widget builds.
read-onlyinherited
- hashCode → int
-
The hash code for this object.
read-onlyinherited
- mounted → bool
-
Whether this State object is currently in a tree.
read-onlyinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- widget → ScrollNotificationObserver
-
The current configuration.
read-onlyinherited
Methods
-
activate(
) → void - Called when this object is reinserted into the tree after having been removed via deactivate.
-
addListener(
ScrollNotificationCallback listener) → void - Add a ScrollNotificationCallback that will be called each time a descendant scrolls.
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
deactivate(
) → void - Called when this object is removed from the tree.
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
didChangeDependencies(
) → void - Called when a dependency of this State object changes.
-
didUpdateWidget(
covariant ScrollNotificationObserver oldWidget) → void - Called whenever the widget configuration changes.
-
dispose(
) → void -
Called when this object is removed from the tree permanently.
override
-
initState(
) → void - Called when this object is inserted into the tree.
-
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.
-
removeListener(
ScrollNotificationCallback listener) → void - Remove the specified ScrollNotificationCallback.
-
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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited