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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| // ORIGINAL PACKAGE: https://pub.dev/packages/flutter_simple_treeview | ||
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| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_simple_treeview/flutter_simple_treeview.dart' | ||
| show TreeNode, TreeController; | ||
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| export 'package:flutter_simple_treeview/flutter_simple_treeview.dart' | ||
| show TreeNode, TreeController; | ||
|
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| /// Tree view with collapsible and expandable nodes. | ||
| class TreeView extends StatefulWidget { | ||
| /// List of root level tree nodes. | ||
| final List<TreeNode> nodes; | ||
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| /// Horizontal indent between levels. | ||
| final double? indent; | ||
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| /// Size of the expand/collapse icon. | ||
| final double? iconSize; | ||
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| /// Tree controller to manage the tree state. | ||
| final TreeController? treeController; | ||
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| TreeView( | ||
| {Key? key, | ||
| required List<TreeNode> nodes, | ||
| this.indent = 40, | ||
| this.iconSize, | ||
| this.treeController}) | ||
| : nodes = copyTreeNodes(nodes), | ||
| super(key: key); | ||
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| @override | ||
| State<TreeView> createState() => _TreeViewState(); | ||
| } | ||
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| class _TreeViewState extends State<TreeView> { | ||
| TreeController? _controller; | ||
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| @override | ||
| void initState() { | ||
| _controller = widget.treeController ?? TreeController(); | ||
| super.initState(); | ||
| } | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return buildNodes( | ||
| widget.nodes, widget.indent, _controller!, widget.iconSize); | ||
| } | ||
| } | ||
|
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| /// Builds set of [nodes] respecting [state], [indent] and [iconSize]. | ||
| Widget buildNodes(Iterable<TreeNode> nodes, double? indent, | ||
| TreeController state, double? iconSize) { | ||
| return Column( | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| children: [ | ||
| for (var node in nodes) | ||
| NodeWidget( | ||
| treeNode: node, | ||
| indent: indent, | ||
| state: state, | ||
| iconSize: iconSize, | ||
| ) | ||
| ], | ||
| ); | ||
| } | ||
|
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| /// Copies nodes to unmodifiable list, assigning missing keys and checking for duplicates. | ||
| List<TreeNode> copyTreeNodes(List<TreeNode>? nodes) { | ||
| return _copyNodesRecursively(nodes, KeyProvider())!; | ||
| } | ||
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| List<TreeNode>? _copyNodesRecursively( | ||
| List<TreeNode>? nodes, KeyProvider keyProvider) { | ||
| if (nodes == null) { | ||
| return null; | ||
| } | ||
| return List.unmodifiable(nodes.map((n) { | ||
| return TreeNode( | ||
| key: keyProvider.key(n.key), | ||
| content: n.content, | ||
| children: _copyNodesRecursively(n.children, keyProvider), | ||
| ); | ||
| })); | ||
| } | ||
|
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| class _TreeNodeKey extends ValueKey { | ||
| const _TreeNodeKey(dynamic value) : super(value); | ||
| } | ||
|
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| /// Provides unique keys and verifies duplicates. | ||
| class KeyProvider { | ||
| int _nextIndex = 0; | ||
| final Set<Key> _keys = <Key>{}; | ||
|
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| /// If [originalKey] is null, generates new key, otherwise verifies the key | ||
| /// was not met before. | ||
| Key key(Key? originalKey) { | ||
| if (originalKey == null) { | ||
| return _TreeNodeKey(_nextIndex++); | ||
| } | ||
| if (_keys.contains(originalKey)) { | ||
| throw ArgumentError('There should not be nodes with the same kays. ' | ||
| 'Duplicate value found: $originalKey.'); | ||
| } | ||
| _keys.add(originalKey); | ||
| return originalKey; | ||
| } | ||
| } | ||
|
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| /// Widget that displays one [TreeNode] and its children. | ||
| class NodeWidget extends StatefulWidget { | ||
| final TreeNode treeNode; | ||
| final double? indent; | ||
| final double? iconSize; | ||
| final TreeController state; | ||
|
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| const NodeWidget( | ||
| {Key? key, | ||
| required this.treeNode, | ||
| this.indent, | ||
| required this.state, | ||
| this.iconSize}) | ||
| : super(key: key); | ||
|
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| @override | ||
| State<NodeWidget> createState() => _NodeWidgetState(); | ||
| } | ||
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| class _NodeWidgetState extends State<NodeWidget> { | ||
| bool get _isLeaf { | ||
| return widget.treeNode.children == null; | ||
| } | ||
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| bool get _isEnabled { | ||
| return widget.treeNode.children?.isNotEmpty ?? false; | ||
| } | ||
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| bool get _isExpanded { | ||
| return widget.state.isNodeExpanded(widget.treeNode.key!); | ||
| } | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| var icon = _isLeaf | ||
| ? null | ||
| : _isExpanded | ||
| ? Icons.expand_more | ||
| : Icons.chevron_right; | ||
|
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| var onIconPressed = _isLeaf || !_isEnabled | ||
| ? null | ||
| : () => setState( | ||
| () => widget.state.toggleNodeExpanded(widget.treeNode.key!)); | ||
|
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| return IgnorePointer( | ||
| ignoring: _isLeaf ? false : !_isEnabled, | ||
| child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [ | ||
| Row(children: [ | ||
| if (!_isLeaf) | ||
| Padding( | ||
| padding: const EdgeInsetsDirectional.only(start: 8.0), | ||
| child: InkWell( | ||
| onTap: onIconPressed, | ||
| borderRadius: BorderRadius.circular(100), | ||
| child: Padding( | ||
| padding: const EdgeInsets.all(4.5), | ||
| child: Icon(icon, size: widget.iconSize), | ||
| ), | ||
| ), | ||
| ), | ||
| Expanded(child: widget.treeNode.content), | ||
| ]), | ||
| if (_isExpanded && !_isLeaf) | ||
| Padding( | ||
| padding: EdgeInsetsDirectional.only(start: widget.indent!), | ||
| child: buildNodes(widget.treeNode.children!, widget.indent, | ||
| widget.state, widget.iconSize), | ||
| ) | ||
| ]), | ||
| ); | ||
| } | ||
| } |
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