ExpansionPanelList class Null safety
A material expansion panel list that lays out its children and animates expansions.
Note that expansionCallback behaves differently for ExpansionPanelList and ExpansionPanelList.radio.
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
flutter create --sample=material.ExpansionPanelList.1 mysample
See also:
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- ExpansionPanelList
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
Properties
- 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.
- 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
Methods
-
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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
nonVirtual">@nonVirtualinherited