TreeStore DragNrop活动没有反映在TreeStore

Question

我创建了一个简单的DragNDrop编辑器来修改一个树来保存在我的数据库中。 （使用GXT 2.2.5无法升级）

我有一个用TreeStore构造的TreePanel。 TreePanel既是TreePanelDragSource又是TreePanelDropTarget。

拖放工作正常; 作为测试，我使用了现有的打开的对话窗口中的TreeStore。 当我在编辑器中拖放时，其他窗口会立即显示树的更改。

但是，当我获取TreeStore进行保存时，节点不会在Store中重新排列。 如何获得重组树结构？

TIA

Answer 1

我的解决方案

Apparently there is no way to directly get at the Tree structure altered by Drag and Drop. 
I reasoned that TreePanelView = TreePanel.getView() might have the Drag and Drop chaanges. 
By examining TreePanelView in the debugger after a drag and drop I devise this solution: 
/* 
* These 'My' classes are used to access the internal tree within TreePanelView. 
* The internal tree reflects Drag and Drop activity, 
* which is NOT reflected in the TreeStore. 
*/ 
private class MyTreePanel<M extends ModelData> extends TreePanel<M> { 
    public MyTreePanel(TreeStore<M> ts) { 
     super(ts); 
     view = new MyView<M>(); 
     view.bind(this, store); 
    } 
    public MyView<M> getMyView() { 
     return (MyView<M>) getView(); 
    } 
} 
private class MyView<M extends ModelData> extends TreePanelView<M> { 
    public MyTreeStore<M> getTreeStore() { 
     return (MyTreeStore<M>) this.treeStore; 
    } 
} 
private class MyTreeStore<M extends ModelData> extends TreeStore<M> { 
    public MyTreeStore() { 
     super(); 
    } 
    public Map<M, TreeModel> getModelMap() { 
     return modelMap; 
    } 
} 
To extract the tree altered by Drag and Drop: 
MyTreePanel<ModelData> myTree; //Initialize the TreeStore appropriately 

// After Drag and Drop activity, get the altered tree thusly: 
Map<ModelData, TreeModel> viewMap = myTree.getMyView().getTreeStore().getModelMap(); 

The TreeModel in viewMap is actually a BaseTreeModel. 
The ModelData are the objects I originally loaded into TreeStore. 
I had to: 
1 - Iterate over viewMap, extract "id" from BaseTreeModel and create a reverse map, 
    indexed by "id" and containing my ModelData objects. 
2 - Fetch root BaseTreeModel node from viewMap using root ModelData of original tree. 
3 - Walk the BaseTreeModel tree. 
    At each node, fetched ModelData objects by "id" from the reverse map. 

In this way I reconstructed the tree altered by Drag and Drop.