ExpandableTree<T> class
Creates a (recursive) menu tree-structure where each item is either a leaf node or a sub-menu containing another tree-structure of sub-nodes.
onSelect callBack of the selected node in the menu. nodes List of nodes at this level of the menu. closedTwisty Override Twisty Widget when node is collapsed. openTwisty Override Twisty Widget when node is expanded. nodeBuilder called to render the node itself from the node's data. openTwistyColor Color override to use when node is expanded. closedTwistyColor Override icon color when node is collapsed. twistyPosition Positioning of the Twisty to be placed before or after. (default) the node. submenuMargin EdgeInsets to add margins around expandable groups. submenuDecoration BoxDecoration to set background and borders on expandable groups. childrenMargin EdgeInsets used to add margins around children under expandable items. childrenDecoration BoxDecoration to set background and borders on children under expandable items.
Example: return ExpandableMenu
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- ExpandableTree
Constructors
-
ExpandableTree({Key? key, NodeSelectedCallback<
T> ? onSelect, Widget closedTwisty = DEFAULT_CLOSED_TWISTY, Widget openTwisty = DEFAULT_OPENED_TWISTY, required List<TreeNode< nodes, required NodeBuilder<T> >T> nodeBuilder, double childIndent = DEFAULT_CHILD_INDENT, bool initiallyExpanded = false, Color? openTwistyColor, Color? closedTwistyColor, TwistyPosition twistyPosition = DEFAULT_TWISTY_POSITION, BoxDecoration? childrenDecoration, EdgeInsets? childrenMargin, }) -
Default constructor. Used for the root as well as any sub-nodes that can
be expanded to show children
const
Properties
- childIndent → double
-
final
- childrenDecoration → BoxDecoration?
-
final
- childrenMargin → EdgeInsets?
-
final
- closedTwisty → Widget
-
final
- closedTwistyColor → Color?
-
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- initiallyExpanded → bool
-
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
-
nodeBuilder
→ NodeBuilder<
T> -
final
-
nodes
→ List<
TreeNode< T> > -
final
-
onSelect
→ NodeSelectedCallback<
T> ? -
final
- openTwisty → Widget
-
final
- openTwistyColor → Color?
-
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
final
-
final
-
final
-
final
- twistyPosition → TwistyPosition
-
final
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent 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.
inherited