如何在 Java 中實現 JTree 的各個節點的滑鼠右鍵點選?\n


JTree JComponent 類的子類,可用於透過向節點新增節點 並保留父節點和子節點的概念來顯示具有層次結構屬性的資料。樹中的每個元素都成為一個節點。這些節點是可展開和可摺疊的。我們可以使用MouseAdapter 類的mouseReleased()方法實現 JTree 中每個節點的滑鼠右鍵單擊,並且需要呼叫JPopupMenu 類的show()方法以在樹節點上顯示彈出選單。

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);
   }
}

輸出

更新時間: 12-2-2020

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