功能：實(shí)現(xiàn)創(chuàng)建一個(gè)樹(shù)形菜單
說(shuō)明：創(chuàng)建樹(shù)形菜單結(jié)構(gòu)與創(chuàng)建菜單欄類似，是按層次與模型創(chuàng)建的。
通過(guò)DefaultMutableTreeNode類創(chuàng)建根節(jié)點(diǎn)、子節(jié)點(diǎn)和孫節(jié)點(diǎn)對(duì)象，再通過(guò)DefaultTreeModel
類利用根節(jié)點(diǎn)創(chuàng)建樹(shù)模型對(duì)象，然后通過(guò)treeModel.insertNodeInto方法將節(jié)點(diǎn)對(duì)象插入樹(shù)模型中。
效果圖：
代碼：
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import java.awt.*; import javax.swing.*; import javax.swing.tree.*; import javax.swing.event.*; public class Tree extends JFrame implements TreeSelectionListener { private JLabel label; public Tree() { super("樹(shù)形菜單"); setSize(400,400); Container container = getContentPane(); //創(chuàng)建根節(jié)點(diǎn)和子節(jié)點(diǎn) DefaultMutableTreeNode root = new DefaultMutableTreeNode("文本編輯器"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("文件"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("編輯"); //利用根節(jié)點(diǎn)創(chuàng)建TreeModel DefaultTreeModel treeModel = new DefaultTreeModel(root); //插入子節(jié)點(diǎn)node1,node2 treeModel.insertNodeInto(node1,root,root.getChildCount()); treeModel.insertNodeInto(node2,root,root.getChildCount()); //創(chuàng)建節(jié)點(diǎn)node1的子節(jié)點(diǎn)并插入 DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("打開(kāi)"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); leafnode = new DefaultMutableTreeNode("保存"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); leafnode = new DefaultMutableTreeNode("另存為"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); leafnode = new DefaultMutableTreeNode("關(guān)閉"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); //創(chuàng)建節(jié)點(diǎn)node2的子節(jié)點(diǎn)并插入 leafnode = new DefaultMutableTreeNode("剪切"); treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); leafnode = new DefaultMutableTreeNode("復(fù)制"); treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); leafnode = new DefaultMutableTreeNode("粘貼"); treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); //創(chuàng)建樹(shù)對(duì)象 JTree tree = new JTree(treeModel); //設(shè)置Tree的選擇為一次只能選擇一個(gè)節(jié)點(diǎn) tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION); //注冊(cè)監(jiān)聽(tīng)器 tree.addTreeSelectionListener(this); tree.setRowHeight(20); //創(chuàng)建節(jié)點(diǎn)繪制對(duì)象 DefaultTreeCellRenderer cellRenderer = (DefaultTreeCellRenderer)tree.getCellRenderer(); //設(shè)置字體 cellRenderer.setFont(new Font("Serif",Font.PLAIN,14)); cellRenderer.setBackgroundNonSelectionColor(Color.white); cellRenderer.setBackgroundSelectionColor(Color.yellow); cellRenderer.setBorderSelectionColor(Color.red); //設(shè)置選或不選時(shí)，文字的變化顏色 cellRenderer.setTextNonSelectionColor(Color.black); cellRenderer.setTextSelectionColor(Color.blue); //把樹(shù)對(duì)象添加到內(nèi)容面板 container.add(new JScrollPane(tree)); //創(chuàng)建標(biāo)簽 label = new JLabel("你當(dāng)前選擇的節(jié)點(diǎn)為：",JLabel.CENTER); label.setFont(new Font("Serif",Font.PLAIN,14)); container.add(label,BorderLayout.SOUTH); setVisible(true); //設(shè)置可見(jiàn) setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //設(shè)置窗口關(guān)閉動(dòng)作 } //處理TreeSelectionEvent事件 public void valueChanged(TreeSelectionEvent event) { JTree tree = (JTree)event.getSource(); //獲取目前選取的節(jié)點(diǎn) DefaultMutableTreeNode selectionNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent(); String nodeName = selectionNode.toString(); label.setText("你當(dāng)前選取的節(jié)點(diǎn)為： "+nodeName); } public static void main(String args[]) { Tree d = new Tree(); } } |
本文按層次與模型創(chuàng)建的樹(shù)形菜單，與創(chuàng)建菜單欄類似，不知道小伙伴們有沒(méi)有掌握吶？
