ExpandIcon class Null safety

A widget representing a rotating expand/collapse button. The icon rotates 180 degrees when pressed, then reverts the animation on a second press. The underlying icon is Icons.expand_more.

The expand icon does not include a semantic label for accessibility. In order to be accessible it should be combined with a label using MergeSemantics. This is done automatically by the ExpansionPanel widget.

See IconButton for a more general implementation of a pressable button with an icon.

See also:

Inheritance

Constructors

ExpandIcon({Key? key, bool isExpanded = false, double size = 24.0, required ValueChanged<bool>? onPressed, EdgeInsetsGeometry padding = const EdgeInsets.all(8.0), Color? color, Color? disabledColor, Color? expandedColor})
Creates an ExpandIcon with the given padding, and a callback that is triggered when the icon is pressed.
const

Properties

color → Color?
The color of the icon.
final
disabledColor → Color?
The color of the icon when it is disabled, i.e. if onPressed is null.
final
expandedColor → Color?
The color of the icon when the icon is expanded.
final
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
isExpanded → bool
Whether the icon is in an expanded state.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onPressed → ValueChanged<bool>?
The callback triggered when the icon is pressed and the state changes between expanded and collapsed. The value passed to the current state.
final
padding → EdgeInsetsGeometry
The padding around the icon. The entire padded icon will react to input gestures.
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
size → double
The size of the icon.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<ExpandIcon>
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

Operators

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