ExpandIcon class

A widget representing a rotating expand/collapse button. The icon rotates 180 deg 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.

Inheritance

Constructors

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

Properties

isExpanded → bool
Whether the icon is in an expanded state. [...]
final
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
size → double
The size of the 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() → _ExpandIconState
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