节点可拖动

win_text_editor/lib/shared/components/tree_view.dart

@@ -23,6 +23,8 @@ class TreeViewConfig {
   final Map<String, IconData> icons;
   final bool showRefreshButton;
   final IconData refreshIcon;
+  final bool draggable; // 是否可拖拽
+  final bool droppable; // 是否可作为拖放目标
 
   const TreeViewConfig({
     this.lazyLoad = false,
@@ -34,6 +36,8 @@ class TreeViewConfig {
     this.icons = const {},
     this.showRefreshButton = false,
     this.refreshIcon = Icons.refresh,
+    this.draggable = false,
+    this.droppable = false,
   });
 }
 
@@ -98,26 +102,75 @@ class _TreeViewState extends State<TreeView> {
   Widget build(BuildContext context) {
     return Stack(
       children: [
-        ListView.builder(
-          controller: _effectiveController,
-          physics: const ClampingScrollPhysics(),
-          itemCount: _countVisibleNodes(widget.nodes),
-          itemBuilder: (context, index) {
-            final node = _getVisibleNode(widget.nodes, index);
-            final isSelected = _selectedIds.contains(node.id);
+        DragTarget<TreeNode>(
+          onWillAcceptWithDetails: (data) {
+            // 检查是否允许拖放
+            if (!widget.config.droppable) return false;
+            return true;
+          },
+          onAcceptWithDetails: (draggedNode) {
+            // 处理拖拽放置逻辑
+            // 你可以在这里实现节点移动或排序的逻辑
+
+            debugPrint('Dropped ${draggedNode.data.name}');
+          },
+          builder: (context, candidateData, rejectedData) {
+            return ListView.builder(
+              controller: _effectiveController,
+              physics: const ClampingScrollPhysics(),
+              itemCount: _countVisibleNodes(widget.nodes),
+              itemBuilder: (context, index) {
+                final node = _getVisibleNode(widget.nodes, index);
+                final isSelected = _selectedIds.contains(node.id);
 
-            return widget.nodeBuilder != null
-                ? widget.nodeBuilder!(context, node, isSelected, () => _handleNodeTap(node))
-                : TreeNodeWidget(
-                  key: ValueKey(node.id),
-                  node: node,
-                  config: widget.config,
-                  isSelected: isSelected,
-                  isChecked: _checkedIds.contains(node.id),
-                  onTap: () => _handleNodeTap(node),
-                  onDoubleTap: () => widget.onNodeDoubleTap?.call(node),
-                  onCheckChanged: (value) => _handleNodeCheckChanged(node, value),
-                );
+                return widget.nodeBuilder != null
+                    ? widget.nodeBuilder!(context, node, isSelected, () => _handleNodeTap(node))
+                    : Draggable<TreeNode>(
+                      data: node,
+                      feedback: Material(
+                        child: Container(
+                          width: 200,
+                          padding: const EdgeInsets.all(8),
+                          decoration: BoxDecoration(
+                            color: Theme.of(context).cardColor,
+                            borderRadius: BorderRadius.circular(4),
+                            boxShadow: [
+                              BoxShadow(
+                                color: Colors.black.withOpacity(0.2),
+                                blurRadius: 4,
+                                offset: const Offset(0, 2),
+                              ),
+                            ],
+                          ),
+                          child: Text(node.title),
+                        ),
+                      ),
+                      childWhenDragging: Opacity(
+                        opacity: 0.5,
+                        child: TreeNodeWidget(
+                          key: ValueKey(node.id),
+                          node: node,
+                          config: widget.config,
+                          isSelected: isSelected,
+                          isChecked: _checkedIds.contains(node.id),
+                          onTap: () => _handleNodeTap(node),
+                          onDoubleTap: () => widget.onNodeDoubleTap?.call(node),
+                          onCheckChanged: (value) => _handleNodeCheckChanged(node, value),
+                        ),
+                      ),
+                      child: TreeNodeWidget(
+                        key: ValueKey(node.id),
+                        node: node,
+                        config: widget.config,
+                        isSelected: isSelected,
+                        isChecked: _checkedIds.contains(node.id),
+                        onTap: () => _handleNodeTap(node),
+                        onDoubleTap: () => widget.onNodeDoubleTap?.call(node),
+                        onCheckChanged: (value) => _handleNodeCheckChanged(node, value),
+                      ),
+                    );
+              },
+            );
           },
         ),