ValueListenableBuilder<T> class

A widget that rebuilds when a ValueListenable changes its value.

ValueListenableBuilder takes a valueListenable and a builder callback. The builder is called whenever the value changes, providing the current value.

ValueListenableBuilder<int>(
  valueListenable: myCounter,
  builder: (context, value, child) {
    return Text('Count: $value');
  },
)

Inheritance

Constructors

ValueListenableBuilder({required ValueListenable<T> valueListenable, required Widget builder(BuildContext context, T value, Widget? child), Widget? child, Key? key}): Creates a widget that rebuilds when valueListenable notifies.

builder → Widget Function(BuildContext context, T value, Widget? child): Called every time the valueListenable notifies.
final
child → Widget?: An optional child widget that does not depend on the value.
final
children → List<Widget>: Child widgets that receive forwarded messages.
no setterinherited
debugRenderObjectPassthrough → bool: Whether this widget is intentionally transparent to render-object layouts.
no setterinherited
focusable → bool: Whether this widget can receive keyboard focus.
no setterinherited
hashCode → int: The hash code for this object.
no setterinherited
id → String: Unique identifier for this widget.
no setterinherited
key → Key?: Key for preserving widget identity.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
theme → Theme: Access the current theme.
no setterinherited
valueListenable → ValueListenable<T>: The ValueListenable to which this widget is listening.
final

buildCachedView<T>(T builder(), Object? cacheKey) → T: Returns a cached view if the cache key matches.
inherited
createState() → State<ValueListenableBuilder<T>>: Creates the mutable State associated with this widget.
override
handleInit() → Cmd?: Override this instead of init for widget-specific initialization.
inherited
handleIntercept(Msg msg) → (Widget, Cmd?): Override this to handle messages before they reach children.
inherited
handleUpdate(Msg msg) → (Widget, Cmd?): Override this to handle messages specific to this widget.
inherited
init() → Cmd?: Called once when the widget is first mounted.
inherited
invalidateCachedView() → void: Clears any cached view for this widget.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited
update(Msg msg) → (Model, Cmd?): Handles messages by forwarding to children then calling handleUpdate.
inherited
view() → Object: Renders the widget to a string or View.
inherited