如何在 Java 中实现鼠标右键单击 JTree 的每个节点?\
awtjavaobject oriented programmingprogrammingswing
JTree 是 JComponent 类的子类，可用于通过在节点上添加 节点 来显示具有 层次结构属性 的数据，并保留父节点和子节点的概念。树中的每个元素都成为一个 节点。节点是 可展开和可折叠 的。我们可以使用 MouseAdapter 类的 mouseReleased() 方法实现鼠标右键单击 JTree 的每个节点，并需要调用 JPopupMenu 类的 show() 方法来显示树节点上的弹出菜单。
示例
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
public class JTreeRightClickTest extends JFrame {
public JTreeRightClickTest() {
DefaultMutableTreeNode root = createNodes();
JTree tree = new JTree(root);
final TreePopup treePopup = new TreePopup(tree);
tree.addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if(e.isPopupTrigger()) {
treePopup.show(e.getComponent(), e.getX(), e.getY());
}
}
});
add(new JScrollPane(tree), BorderLayout.NORTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 300);
setLocationRelativeTo(null);
setVisible(true);
}
public static DefaultMutableTreeNode createNodes() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Technology");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Java");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Python");
DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Selenium");
node1.add(new DefaultMutableTreeNode("Programming Language"));
node2.add(new DefaultMutableTreeNode("Programming Language"));
node3.add(new DefaultMutableTreeNode("Testing Framework"));
root.add(node1);
root.add(node2);
root.add(node3);
return root;
}
public static void main(String args[]) {
new JTreeRightClickTest();
}
}
class TreePopup extends JPopupMenu {
public TreePopup(JTree tree) {
JMenuItem delete = new JMenuItem("Delete");
JMenuItem add = new JMenuItem("Add");
delete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
System.out.println("Delete child");
}
});
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
System.out.println("Add child");
}
});
add(delete);
add(new JSeparator());
add(add);
}
}
输出
