ExpansionElementWidget class

A single-line ListTile with a trailing button that expands or collapses the tile to reveal or hide the children.

This widget is typically used with ListView to create an "expand / collapse" list entry. When used with scrolling widgets like ListView, a unique PageStorageKey must be specified to enable the ExpansionElementWidget to save and restore its expanded state when it is scrolled in and out of view.

See also:

Inheritance
Available Extensions

Constructors

ExpansionElementWidget({Key? key, String title = "", String? subtitle, Color? backgroundColor, ValueChanged<bool>? onExpansionChanged, List<Widget> children = const <Widget>[], bool initiallyExpanded = false, String? deleteText, VoidCallback? callback, BrnFormItemConfig? themeData})
Creates a single-line ListTile with a trailing button that expands or collapses the tile to reveal or hide the children. The initiallyExpanded property must be non-null.

Properties

backgroundColor → Color?
The color to display behind the sublist when expanded.
final
callback → VoidCallback?
final
children → List<Widget>
The widgets that are displayed when the tile expands.
final
deleteText → String?
final
hashCode → int
The hash code for this object.
no setterinherited
initiallyExpanded → bool
Specifies if the list tile is initially expanded (true) or collapsed (false, the default).
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onExpansionChanged → ValueChanged<bool>?
Called when the tile expands or collapses.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
subtitle → String?
Additional content displayed below the title.
final
themeData ↔ BrnFormItemConfig?
getter/setter pair
title → String
The primary content of the list item.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → _ExpansionElementState
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
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
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

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