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Description:

list treeview

ListTreeView #
A treeview for Flutter. Based on the listview

Highly customizable. It only manages the tree structure of the data, and the UI is designed by yourself.
Performance is efficient because of the Listview's reuse mechanism.
Infinitely increasing child levels and child nodes

Flutter 2.0 support #

flutter 2.0 null safety support in version 0.3.0

Getting Started #
Installation #
1. Depend on it
dependencies:
list_treeview: [version]
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2. Install it
$ flutter pub get

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3. Import it
import 'package:list_treeview/list_treeview.dart';

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Usage #
1、initialize controller.
The controller must be initialized when the treeView create
class _TreePageState extends State<TreePage> {
TreeViewController _controller;
@override
void initState() {
super.initState();
///The controller must be initialized when the treeView create
_controller = TreeViewController();
}
}
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2、Set the data for each row.

Your data class must inherit from Nodedata, and you can customize other properties of the class.

/// The data class that is bound to the child node
/// You must inherit from NodeData ！！！
/// You can customize any of your properties
class TreeNodeData extends NodeData {
TreeNodeData({this.label,this.color}) : super();

/// Other properties that you want to define
final String label;
final Color color;
String property1;
String property2;
String property3;
///...
}
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Set the TreeView's data, use '_controller.treeData()'

void getData() async {
print('start get data');
_isSuccess = false;
await Future.delayed(Duration(seconds: 2));

var colors1 = TreeNodeData(label: 'Colors1');
var color11 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 0, 139, 69));
var color12 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 0, 191, 255));
var color13 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 255, 106, 106));
var color14 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 160, 32, 240));
colors1.addChild(color11);
colors1.addChild(color12);
colors1.addChild(color13);
colors1.addChild(color14);

var colors2 = TreeNodeData(label: 'Colors2');
var color21 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 255, 64, 64));
var color22 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 28, 134, 238));
var color23 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 255, 106, 106));
var color24 = TreeNodeData(
label: 'rgb(0,139,69)', color: Color.fromARGB(255, 205, 198, 115));
colors2.addChild(color21);
colors2.addChild(color22);
colors2.addChild(color23);
colors2.addChild(color24);

/// set data
_controller.treeData([colors1, colors2]);
print('set treeData suceess');

setState(() {
_isSuccess = true;
});

}

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Insert
_controller.insertAtFront(dataNode,newNode);
//_controller.insertAtRear(dataNode, newNode);
//_controller.insertAtIndex(1, dataNode, newNode);
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Remove
_controller.removeItem(item);
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Expand or collapse children
/// Control item to expand or collapse
/// [index] The index of the selected item
_controller.expandOrCollapse(index);
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Selected
/// select only itself
_controller.selectItem(item);

/// Select itself and all child nodes
_controller.selectAllChild(item);
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