ChartBuilder class

A convenience widget that rebuilds whenever a ChartModel changes.

ChartBuilder subscribes to the given model and calls builder each time the model notifies its listeners. The returned widget is typically one of the chart widgets (SparklineChart, LineChart, etc.) but can be any widget tree.

final model = ChartModel(
  type: ChartType.line,
  values: [10, 20, 15, 30],
  showGrid: true,
);

ChartBuilder(
  model: model,
  builder: (context, model) => LineChart(
    values: model.values,
    showGrid: model.showGrid,
    width: 60,
    height: 12,
  ),
)

Under the hood this is a thin wrapper around ListenableBuilder that provides typed access to the ChartModel in the builder callback.

Inheritance

Constructors

ChartBuilder({required ChartModel model, required Widget builder(BuildContext context, ChartModel model), Key? key})
Creates a ChartBuilder that rebuilds when model changes.

Properties

builder → Widget Function(BuildContext context, ChartModel model)
Called on each rebuild to produce the widget subtree.
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
model → ChartModel
The observable chart model to subscribe to.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
theme → Theme
Access the current theme.
no setterinherited

Methods

buildCachedView<T>(T builder(), Object? cacheKey) → T
Returns a cached view if the cache key matches.
inherited
createState() → State<ChartBuilder>
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.
override

Operators

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