JTree键绑定

Question

我正在尝试为JTree重新绑定F2键，如此处https://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html所示。这是代码：

System.out.println(DataModelTree.getInputMap(JComponent.WHEN_FOCUSED).get(KeyStroke.getKeyStroke("F2")));
//This gives string "startEditing"

DataModelTree.getActionMap().put("startEditing", new javax.swing.AbstractAction() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
        System.out.println("F2 pressed");
    }
});

也尝试过此变体：

DataModelTree.getActionMap().put(DataModelTree.getInputMap(JComponent.WHEN_FOCUSED).get(KeyStroke.getKeyStroke("F2")), new javax.swing.AbstractAction() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
         System.out.println("F2 pressed");
    }
});

试图创建单独的非匿名动作类。试图初步删除InputMap和父InputMap中的条目。尝试以其他模式重新绑定：WHEN_ANCESTOR_OF_FOCUSED_COMPONENT和WHEN_IN_FOCUSED_WINDOW。没用。 JTree的键绑定保持不变。

请帮助。

Answer 1

[抱歉，我们无法回答您的问题，因为我们看不到您的完整代码。请提供runnable class，以重现您的错误行为，以便我们更轻松地确定您的错误在哪里。

这是一个小例子，如何为F2键提供树的编辑

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

/**
 * <code>TestTree</code>.
 */
public class TestTree {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new TestTree()::startUp);
    }

    private void startUp() {
        JTree tree = new JTree();
        tree.setEditable(true);
        tree.getActionMap().put(tree.getInputMap().get(KeyStroke.getKeyStroke("F2")), new AbstractAction() {

            @Override
            public void actionPerformed(ActionEvent e) {
                if (tree.getSelectionPath() != null) {
                    tree.startEditingAtPath(tree.getSelectionPath());
                } else {
                    JOptionPane.showMessageDialog(tree, "Nothing selected");
                }
            }
        });
        JFrame frm = new JFrame("edit tree");
        frm.add(new JScrollPane(tree));
        frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frm.setSize(300, 200);
        frm.setLocationRelativeTo(null);
        frm.setVisible(true);
    }
}