Accordion class

An expandable/collapsible section with a header.

The Accordion widget shows a title and expands to reveal its child when expanded is true. Clicking the header toggles the expanded state if onChanged is provided.

Use leading to add an icon or indicator before the title.

Example:

Accordion(
  title: 'Advanced Settings',
  leading: Icon('⚙'),
  expanded: _expanded,
  onChanged: (v) => setState(() => _expanded = v),
  child: Column(children: [Toggle('Option 1'), Toggle('Option 2')]),
)
Inheritance

Constructors

Accordion({required String title, required Widget child, bool expanded = false, ValueCmdCallback<bool>? onChanged, bool enabled = true, Widget? leading, EdgeInsets? padding, Key? key})

Properties

accessibilityLabel → String?
Optional accessibility label.
no setterinherited
accessibilityRole → String
Optional accessibility role.
no setterinherited
child → Widget
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
degradationSignal → WidgetDegradationSignal
Signal that controls this widget's render budget behavior.
no setterinherited
enabled → bool
final
expanded → bool
final
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
leading → Widget?
final
onChanged → ValueCmdCallback<bool>?
final
padding → EdgeInsets?
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
theme → Theme
Access the current theme.
no setterinherited
title → String
final

Methods

build(BuildContext context) → Widget
Describes the part of the UI represented by this widget.
override
buildCachedView<T>(T builder(), Object? cacheKey) → T
Returns a cached view if the cache key matches.
inherited
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
shouldRenderAt(DegradationLevel degradationLevel, {required bool subtreeHasFocusedWidget}) → bool
Whether this widget should participate in the current render when degradationLevel is active.
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

Operators

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