material library

ExpansionTile 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 ExpansionTile to save and restore its expanded state when it is scrolled in and out of view.

Constructors

ExpansionTile({Key key, Widget leading, @required Widget title, Color backgroundColor, ValueChanged<bool> onExpansionChanged, List<Widget> children: const [], Widget trailing, bool initiallyExpanded: false }): 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.
const

Properties

backgroundColor → Color: The color to display behind the sublist when expanded.
final
children → List<Widget>: The widgets that are displayed when the tile expands. [...]
final
initiallyExpanded → bool: Specifies if the list tile is initially expanded (true) or collapsed (false, the default).
final
leading → Widget: A widget to display before the title. [...]
final
onExpansionChanged → ValueChanged<bool>: Called when the tile expands or collapses. [...]
final
title → Widget: The primary content of the list item. [...]
final
trailing → Widget: A widget to display instead of a rotating arrow icon.
final
hashCode → int: The hash code for this object. [...]
read-only, inherited
key → Key: Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

Methods

createState() → _ExpansionTileState: Creates the mutable state for this widget at a given location in the tree. [...]
override
createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent 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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String: Returns 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 ==(dynamic other) → bool: The equality operator. [...]
inherited