我在扩展 JTree 节点时遇到问题。当使用选择一个节点时,我开始,除了所选节点的路径和要折叠的所选节点本身之外的所有内容。我试过使用
tree.collapsePath(new TreePath(tree.getModel().getRoot()));
tree.expandPath(new TreePath(e111.getPath()));
类似这样的东西,但它似乎没有效果,我真的不知道我该怎么做
这是我的树的样子:
http://img220.imageshack.us/img220/3450/jtreepng.png
如果我单击 1.1.1,我希望折叠除 1.1.1 节点和指向它的路径中的元素之外的所有其他内容。
这是我创建的应用程序:
public class SelectableTree extends JFrame implements TreeSelectionListener {
public static void main(String[] args) {
new SelectableTree();
}
DefaultMutableTreeNode root;
DefaultMutableTreeNode e1;
DefaultMutableTreeNode e2;
DefaultMutableTreeNode e3;
DefaultMutableTreeNode e11;
DefaultMutableTreeNode e22;
DefaultMutableTreeNode e33;
DefaultMutableTreeNode e111;
DefaultMutableTreeNode e222;
DefaultMutableTreeNode e333;
DefaultMutableTreeNode aChild;
private JTree tree;
private JTextField currentSelectionField;
public SelectableTree() {
super("JTree Selections");
WindowUtilities.setNativeLookAndFeel();
addWindowListener(new ExitListener());
Container content = getContentPane();
root = new DefaultMutableTreeNode("Root");
e1 = new DefaultMutableTreeNode("1");
e2 = new DefaultMutableTreeNode("2");
e3 = new DefaultMutableTreeNode("3");
e11 = new DefaultMutableTreeNode("1.1");
e22 = new DefaultMutableTreeNode("2.2");
e33 = new DefaultMutableTreeNode("3.3");
e111 = new DefaultMutableTreeNode("1.1.1");
e222 = new DefaultMutableTreeNode("2.2.2");
e333 = new DefaultMutableTreeNode("3.3.3");
root.add(e1);
root.add(e2);
root.add(e3);
e1.add(e11);
e2.add(e22);
e3.add(e33);
e11.add(e111);
e22.add(e222);
e33.add(e333);
tree = new JTree(root);
tree.addTreeSelectionListener(this);
content.add(new JScrollPane(tree), BorderLayout.CENTER);
currentSelectionField = new JTextField("Current Selection: NONE");
content.add(currentSelectionField, BorderLayout.SOUTH);
setSize(250, 275);
setVisible(true);
}
public void valueChanged(TreeSelectionEvent event) {
tree.clearSelection();
tree.collapsePath(new TreePath(tree.getModel().getRoot()));
tree.expandPath(new TreePath(e111.getPath()));
}
编辑:奇怪的是 tree.collapsePath
工作得很好,似乎 tree.expandPath(new TreePath(e111.getPath()));
是问题所在
最佳答案
Swing GUI 对象应该仅在 event dispatch thread 上构建和操作.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
public class SelectableTree extends JFrame implements TreeSelectionListener {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new SelectableTree();
}
});
}
DefaultMutableTreeNode root;
DefaultMutableTreeNode e1 = new DefaultMutableTreeNode("1");
DefaultMutableTreeNode e2 = new DefaultMutableTreeNode("2");
DefaultMutableTreeNode e3 = new DefaultMutableTreeNode("3");
DefaultMutableTreeNode e11 = new DefaultMutableTreeNode("1.1");
DefaultMutableTreeNode e22 = new DefaultMutableTreeNode("2.2");
DefaultMutableTreeNode e33 = new DefaultMutableTreeNode("3.3");
DefaultMutableTreeNode e111 = new DefaultMutableTreeNode("1.1.1");
DefaultMutableTreeNode e222 = new DefaultMutableTreeNode("2.2.2");
DefaultMutableTreeNode e333 = new DefaultMutableTreeNode("3.3.3");
DefaultMutableTreeNode aChild;
private JTree tree;
private JTextField currentSelectionField;
public SelectableTree() {
super("JTree Selections");
setDefaultCloseOperation(EXIT_ON_CLOSE);
root = new DefaultMutableTreeNode("Root");
root.add(e1);
root.add(e2);
root.add(e3);
e1.add(e11);
e2.add(e22);
e3.add(e33);
e11.add(e111);
e22.add(e222);
e33.add(e333);
tree = new JTree(root);
tree.addTreeSelectionListener(this);
add(new JScrollPane(tree), BorderLayout.CENTER);
currentSelectionField = new JTextField("Current Selection: NONE");
add(currentSelectionField, BorderLayout.SOUTH);
setSize(250, 275);
setLocationRelativeTo(null);
setVisible(true);
}
@Override
public void valueChanged(TreeSelectionEvent event) {
tree.expandPath(new TreePath(e11.getPath()));
currentSelectionField.setText(event.getPath().toString());
}
}
关于java - 展开特定的 JTree 路径,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11256159/