ExpansionPanelList class Null safety

A material expansion panel list that lays out its children and animates expansions.

Here is a simple example of how to implement ExpansionPanelList.

To create a local project with this code sample, run:
flutter create --sample=material.ExpansionPanelList.1 mysample

Constructors

ExpansionPanelList({Key? key, List<ExpansionPanel> children = const <ExpansionPanel>[], ExpansionPanelCallback? expansionCallback, Duration animationDuration = kThemeAnimationDuration, EdgeInsets expandedHeaderPadding = _kPanelHeaderExpandedDefaultPadding, Color? dividerColor, double elevation = 2}): Creates an expansion panel list widget. The expansionCallback is triggered when an expansion panel expand/collapse button is pushed.
const
ExpansionPanelList.radio({Key? key, List<ExpansionPanel> children = const <ExpansionPanelRadio>[], ExpansionPanelCallback? expansionCallback, Duration animationDuration = kThemeAnimationDuration, Object? initialOpenPanelValue, EdgeInsets expandedHeaderPadding = _kPanelHeaderExpandedDefaultPadding, Color? dividerColor, double elevation = 2}): Creates a radio expansion panel list widget.
const

animationDuration → Duration: The duration of the expansion animation.
final
children → List<ExpansionPanel>: The children of the expansion panel list. They are laid out in a similar fashion to ListBody.
final
dividerColor → Color?: Defines color for the divider when ExpansionPanel.isExpanded is false.
final
elevation → double: Defines elevation for the ExpansionPanel while it's expanded.
final
expandedHeaderPadding → EdgeInsets: The padding that surrounds the panel header when expanded.
final
expansionCallback → ExpansionPanelCallback?: The callback that gets called whenever one of the expand/collapse buttons is pressed. The arguments passed to the callback are the index of the pressed panel and whether the panel is currently expanded or not.
final
hashCode → int: The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
initialOpenPanelValue → Object?: The value of the panel that initially begins open. (This value is only used when initializing with the ExpansionPanelList.radio constructor.)
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
read-onlyinherited

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<StatefulWidget>: 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.
protected">@protectedinherited
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 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

operator ==(Object other) → bool: The equality operator.
nonVirtual">@nonVirtualinherited