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我正在使用 a来检测对项目的MouseListener双击。JTreeJTree是位于一个JScrollPane. 当我检测到双击 (a MouseEvent) 时,我从JTree. 大多数情况下,这工作正常。

现在,如果我双击带有子节点的(折叠)节点,该节点会展开,因此滚动窗格会向下滚动。当我尝试从单击位置获取树路径时,会JTree查看当前(滚动)视图并返回错误的项目,因为单击位置指的是前一个视图(未滚动)。

有谁知道如何解决这个问题?下面,我将附上一个示例来演示该问题。


package test;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JDialog;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

public class TestMain extends JDialog implements MouseListener {

    protected final JTree tree;

    public TestMain() {
        tree = new JTree(getRootNode());
        tree.addMouseListener(this);

        JScrollPane pane = new JScrollPane(tree);
        pane.setPreferredSize(new Dimension(250, 300));

        getContentPane().add(pane, BorderLayout.CENTER);
        pack();
    }

    private TreeNode getRootNode() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");

        for (int i = 0; i < 10; i++) {
            root.add(new DefaultMutableTreeNode("Node " + i));
        }

        DefaultMutableTreeNode sub = new DefaultMutableTreeNode("Sub");
        root.add(sub);

        for (int i = 0; i < 10; i++) {
            sub.add(new DefaultMutableTreeNode("Sub " + i));
        }

        return root;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        if (e.getClickCount() == 2) {
            TreePath path = tree.getPathForLocation(e.getX(), e.getY());
            if (path != null) {
                System.out.println(path.getLastPathComponent().toString());
            }
        }
    }

    @Override
    public void mousePressed(MouseEvent e) {

    }

    @Override
    public void mouseReleased(MouseEvent e) {

    }

    @Override
    public void mouseEntered(MouseEvent e) {

    }

    @Override
    public void mouseExited(MouseEvent e) {

    }

    public static void main(String[] args) {
        JDialog dialog = new TestMain();
        dialog.setVisible(true);
    }
}
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1 回答 1

2

我建议您使用JTree.getSelectionPath().getLastPathComponent(),因为它不会在滚动时改变。

于 2012-11-16T15:02:50.627 回答