expandable_tree_menu

Description:

expandable tree menu

expandable_tree_menu #
Builds a Tree of Sub-menus that can be expanded/collapsed, where each node can recursively
contain another tree, using a recursive list of "Nodes".

Each Node has a value payload that will be passed to the onSelect handler.
Nodes are rendered using a nodeBuilder which will use the value of the node.
Options available: #

initiallyExpanded: true // start with all nodes expanded (default is collapsed)
twistyPosition: TwistyPosition.before (default is TwistyPosition.after)
openTwistyColor: Color // Used when children are expanded (default based on theme)
closedTwistyColor: Color // Used when children are collapsed (default based on theme)
openTwisty: Widget // Widget used when children are expanded (default Icons.expand_less)
closedTwisty: Widget // Widget used when children are collapsed (default: Icons.expand_more)
childIndent: double // Left offset used for expanded children under the node (default: 28)
submenuDecoration: BoxDecoration? // Border and background of submenu with children
childrenDecoration: BoxDecoration // Border and background of children under submenu
childrenMargin: EdgeInsets? // Margin around children under Submenu
submenuMargin: EdgeInsets // Margin around submenu with children
submenuClosedColor: Color // Used for submenu when collapsed
submenuOpenColor: Color // Used for submenu when expanded ;

Basic Usage #
ExpandableTree(
nodes: [
TreeNode('Category A',
subNodes: [
TreeNode('CatA first item'),
TreeNode('CatA second item'),
],
),
TreeNode('Category B',
subNodes: [
TreeNode('Cat B first item'),
TreeNode('Cat B sub-category 1',
subNodes: [
TreeNode('Cat B1 first item'),
TreeNode('Cat B1 second item'),
TreeNode('Cat B1 third item'),
TreeNode('Cat B1 final item'),
],
),
],
),
],
nodeBuilder: (context, nodeValue) => Card(
child: Text(nodeValue.toString()),
),
onSelect: (node) => _nodeSelected(context, node),
)
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