JTree 删除节点 无法刷新

[tpz_stamp]

DefaultMutableTreeNode node = (DefaultMutableTreeNode)path.getLastPathComponent();
DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
model.removeNodeFromParent(node);

被删除的节点还显示在tree中，遍历它的parent，已经没有了，咋办呢？？？？

[tpz_stamp]

DefaultMutableTreeNode node =(DefaultMutableTreeNode)path.getLastPathComponent();

DefaultTreeModel model = (DefaultTreeModel)tree.getModel();

DefaultMutableTreeNode parent = (DefaultMutableTreeNode)node.getParent();
model.removeNodeFromParent(node);
node.removeFromParent();
int count = model.getChildCount(parent);
System.out.println("parent: " + parent.getUserObject());

Enumeration en = parent.children();
while(en.hasMoreElements()) {
DefaultMutableTreeNode child = (DefaultMutableTreeNode)en.nextElement();
System.out.println(child.getUserObject());
}

[confusing]

model.reload()- -

[kkxygjf]

删完后让tree刷新一次看看。

[tpz_stamp]

我是在jtree 的 drag & drop 实现里遇到该问题的。 后来发现，如果用注释中的语句就能成功删除，用以下第一行的语句得到TreePath就有问题。 不知道为什么。

TreePath path = (TreePath)t.getTransferData(this.flavor);

//TreePath path = (TreePath)tree.getSelectionPath();

=================== 完整代码如下==================
public synchronized void drop(DropTargetDropEvent dtde) {
// TODO Auto-generated method stub
if(!this.isDropAcceptable(dtde)) {
dtde.rejectDrop();
return;
}

try {
dtde.acceptDrop(dtde.getDropAction());

DropTargetContext dtc = dtde.getDropTargetContext();
JTree tree = (JTree)dtc.getComponent();

Point pt = dtde.getLocation();
TreePath newPath = tree.getClosestPathForLocation(pt.x, pt.y);
DefaultMutableTreeNode newParent = (DefaultMutableTreeNode)newPath.getLastPathComponent();
System.out.println(newParent.getUserObject());
if(newParent.isLeaf()) {
dtde.rejectDrop();
return;
}

Transferable t = dtde.getTransferable();
TreePath path = (TreePath)t.getTransferData(this.flavor);
//TreePath path = (TreePath)tree.getSelectionPath();


DefaultMutableTreeNode node = (DefaultMutableTreeNode)path.getLastPathComponent();

//model.insertNodeInto(newNode, newParent, 0);
DefaultMutableTreeNode parent = (DefaultMutableTreeNode)node.getParent();
System.out.println("node: " + node.getUserObject());
System.out.println("parent: " + parent.getUserObject());
model.removeNodeFromParent(node);
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println(e);
}
dtde.dropComplete(true);
return;
}

[铁匠梁老师]

DefaultMutableTreeNode node = (DefaultMutableTreeNode)path.getLastPathComponent(); 
DefaultTreeModel model = (DefaultTreeModel)tree.getModel(); 
model.removeNodeFromParent(node);
model.nodeChanged(TreeNode node)

[老张-AI]

帮顶

[zhangwei_huahuan]

DefaultMutableTreeNode node = (DefaultMutableTreeNode)path.getLastPathComponent();

如果用DefaultTreeModel方法构造的树，当树节点增加、删除时候不需要刷新树

增加：model.insertNodeInto(MutableTreeNode newChild, MutableTreeNode parent, int index)
删除：model.removeNodeFromParent(node);

[zhangwei_huahuan]

sorry，写错了，我是这样实现的，你试一下，看看行不

DefaultMutableTreeNode node = (DefaultMutableTreeNode path.getLastSelectedPathComponent();

如果用DefaultTreeModel方法构造的树，当树节点增加、删除时候不需要刷新树

增加：model.insertNodeInto(MutableTreeNode newChild, MutableTreeNode parent, int index)
删除：model.removeNodeFromParent(node);

[diggywang]

最后jtree要来一次updateUI（）

[漫无目的行走的月亮]

tree.revalidate();

[yyyzlf]

repaint();
//最好不要用upadateUI

用insertNodeInto和removeNodeFromParent不需要刷新。