[英]JTree doesn`t update after removing node
I am trying to remove node from JTree and i have two codes That code is working 我正在尝试从JTree中删除节点,并且我有两个代码,该代码正在工作
public class test {
private JFrame frame;
JTree tree;
DefaultMutableTreeNode root;
DefaultTreeModel model;
private Map<String, DefaultMutableTreeNode> treeMap;
public static void main(String[] args) {
test t = new test();
//scrolltree is basically a panel contains class has JTree
scrolltree st = new scrolltree();
t.frame.add(st);
JButton b = new JButton("remove node");
t.frame.add(b, BorderLayout.SOUTH);
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
DefaultTreeModel model = (DefaultTreeModel) st.getTree().getTree().getModel();
String key = new currentfolder().getCurrentfolder() + "/" + "a3.png";
System.out.println(key);
model.removeNodeFromParent(st.getTree().getTreeMap().get(key));
}
});
t.frame.revalidate();
t.frame.repaint();
}
public test() {
frame = new JFrame();
frame.setVisible(true);
frame.setSize(500, 500);
}
and that code removes it perfectly and updated it too 该代码完美地删除了它并更新了它
while the other same one delete the node but doesn`t update it(unless i created new tree and replaced with old one) 而另一个相同的节点删除该节点但不更新它(除非我创建了新树并替换为旧的树)
i have tried all listed solution in many placed like https://community.oracle.com/thread/2495518?tstart=0 我已经尝试了所有列出的解决方案,例如https://community.oracle.com/thread/2495518?tstart=0
but non of them work my non-working code goes as follows 但是它们都不起作用,我的不起作用的代码如下
DefaultTreeModel model = (DefaultTreeModel)startframe.getScrolltree().getTree().getTree().getModel();
String key = new currentfolder().getCurrentfolder()+"/"+"a3.png";
System.out.println(key);
model.removeNodeFromParent(startframe.getScrolltree().getTree().getTreeMap().get(key));
and my class tree goes as following 我的班级树如下
public class tree {
JTree tree;
DefaultMutableTreeNode node1;
DefaultTreeModel model;
String name = new currentfolder().getInitial();// path to directory that its
// content appear in tree
private Map<String, DefaultMutableTreeNode> treeMap;
public tree() {
tree = new JTree();
tree.setExpandsSelectedPaths(true);
node1 = new DefaultMutableTreeNode(name);
model = new DefaultTreeModel(node1);
tree.setModel(model);
treeMap = new HashMap<>();
treeMap.put(name, node1);
//method to inset many other nodes
import_data(new File(name), node1);
model.reload();
tree.setOpaque(false);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setBorder(javax.swing.BorderFactory.createCompoundBorder(
new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED),
javax.swing.BorderFactory.createTitledBorder("")));
tree.setVisible(true);
when i do tree t = new tree;
当我做tree t = new tree;
then place it over old tree it works 然后把它放在那棵老树上
how can I fix that and any explanation why this isn`t working? 我该如何解决该问题以及为何无法解决问题的任何解释? thanks 谢谢
When I replace all that with
SwingUtilites.invokeLater()
, it worked. 当我将所有内容替换为SwingUtilites.invokeLater()
,它起作用了。 I don't understand why. 我不明白为什么。
As suggested here , be sure to construct and manipulate Swing GUI objects only on the event dispatch thread . 作为建议在这里 ,一定要建立和仅在操纵的Swing GUI对象事件调度线程 。 In particular, updating the TreeModel
from another thread means that the listening JTree
view may receive updates in some unexpected order—or not at all. 特别是,从另一个线程更新TreeModel
意味着侦听的JTree
视图可能以某种意外的顺序接收更新,或者根本不接收。
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