我在一个框架中有 2 个 JTrees,碰巧,例如,如果我选择蓝色(从左边的树),它将填充右边的树,之后,如果我现在选择红色,蓝色显示右侧不会消失以显示红色。
我尝试了三种不同的方法,比如 reloading()、repainting()、设置为 null,都没有用。
DefaultTreeModel defMod1 = (DefaultTreeModel)jTree1.getModel();
defMod1.reload();
jTree1.repaint();
defMod1.setRoot(null);
我想要的是右边的树显示左边树上当前选择的内容。即,如何重新加载或重绘右侧树以在左侧树上显示当前选择的内容?
我使用以下代码在我实现的 TreeSelectionListener 接口(interface)的 valueChange() 中获取当前选择。
DefaultMutableTreeNode node = (DefaultMutableTreeNode) jTree1.getLastSelectedPathComponent();
我需要帮助。 谢谢
PS:我试过DevilsHnd的解决方案,但还是不行。部分代码如下。是的,我想要一种clearTree() 函数。
@Override
public void valueChanged(TreeSelectionEvent e){
JTree treeSource = (JTree) e.getSource();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) jTree1.getLastSelectedPathComponent();//gets the selection
if(treeSource == jTree1 ){//if it is the tree on the left
if(node == null)//if a node is selected
return;
Object nodeInfo = node.getUserObject();
if(node.isLeaf()){
try {
String ipp = (String)nodeInfo;
root2 = new DefaultMutableTreeNode(InetAddress.getByName((String)nodeInfo)+ " | " + "Local Disk (C:)");//root node for the tree on the right
selectedPcIP = InetAddress.getByName(ipp).getHostAddress();
selectedIP = "\\\\" + selectedPcIP +"\\c$";
ArrayList creds = new BackItDb().getCreds();//gets user name and password from the database
NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication("",creds.get(0).toString(),creds.get(1).toString());
try {
SmbFile file = new SmbFile("smb://"+selectedPcIP + "/" + System.getProperty("user.home").replace('C', 'c').replace(":", "$").replaceAll("[\\\\]","/")+"/",auth);//gets the folders from the selected PC
jTree1.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
createSecondTree(file,root2,selectedPcIP);//This is a function that creates the tree on the right(jtree2).
jTree1.setCursor(Cursor.getDefaultCursor());
treeModel2 = new DefaultTreeModel(root2);// treemodel for the tree on the right
jTree2.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jTree2.setModel(treeModel2);// the tree on the right
}catch (UnknownHostException ex) {
Logger.getLogger(BackIt_Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
最佳答案
当然我可能是错的,但听起来您想要的是某种类型的 clearTree() 方法,您可以在调用填充树的方法之前调用该方法。
这可以用这种类型的方法来完成:
/**
* Removes all nodes from the supplied JTree except the Root.
*
* @param tree (JTree) The JTree Variable Name for which to
* clear all nodes from.
*/
public static void clearTree(JTree tree) {
if (tree.toString() == null) { return; }
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
root.removeAllChildren();
model.reload();
}
EDIT: As per OP's question in comments: "How to remove all nodes including the root?"
要在这篇文章下方的评论中回答您的问题,它实际上是一个相当简单的一行:yourTree_VariableName.setModel(null);
。所以,你可以像这样制作另一个简单的方法:
/**
* This method will completely wipe out (clear) all nodes
* from a JTree including the Root node. After using this
* method you will need to construct another tree model to
* refill it.
*
* @param tree (JTree) The JTree Variable Name for which to
* wipe all nodes from.
*/
public static void wipeTree(JTree tree) {
tree.setModel(null);
}
关于java - 如何在 java 中填充或重新加载 jtree,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45889945/