Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

29 private JComboBox jcboShowsRootHandles = new JComboBox(
30 new String[] {"false", "true"});
31
32 // Create a spinner for selecting row height
33 private JSpinner jSpinnerRowHeight = new JSpinner(
34 new SpinnerNumberModel(16, 1, 50, 1));
35
36 public SimpleTreeDemo() {
37 jTree1.setRootVisible(false);
38
39 hashtable.put(1, "red");
40 hashtable.put(2, "green");
41 hashtable.put(3, "blue");
42 hashtable.put(4, "yellow");
43 jTree4 = new JTree(hashtable);
44
45 JPanel panel1 = new JPanel(new GridLayout(1, 4));
46 panel1.add(new JScrollPane(jTree1));
47 panel1.add(new JScrollPane(jTree2));
48 panel1.add(new JScrollPane(jTree3));
49 panel1.add(new JScrollPane(jTree4));
50
51 JPanel panel2 = new JPanel();
52 panel2.add(new JLabel("rootVisible"));
53 panel2.add(jcboRootVisible);
54 panel2.add(new JLabel("rowHeight"));
55 panel2.add(jSpinnerRowHeight);
56 panel2.add(new JLabel("showsRootHandles"));
57 panel2.add(jcboShowsRootHandles);
58
59 add(panel1, BorderLayout.CENTER);
60 add(panel2, BorderLayout.SOUTH);
61
62 // Register listeners
63 jcboRootVisible.addActionListener(new ActionListener() {
64 public void actionPerformed(ActionEvent e) {
65 boolean rootVisible =
66 jcboRootVisible.getSelectedItem().equals("true");
67 jTree1.setRootVisible(rootVisible);
68 jTree2.setRootVisible(rootVisible);
69 jTree3.setRootVisible(rootVisible);
70 jTree4.setRootVisible(rootVisible);
71 }
72 });
73
74 jcboShowsRootHandles.addActionListener(new ActionListener() {
75 @Override
76 public void actionPerformed(ActionEvent e) {
77 boolean showsRootHandles =
78 jcboShowsRootHandles.getSelectedItem().equals("true");
79 jTree1.setShowsRootHandles(showsRootHandles);
80 jTree2.setShowsRootHandles(showsRootHandles);
81 jTree3.setShowsRootHandles(showsRootHandles);
82 jTree4.setShowsRootHandles(showsRootHandles);
83 }
84 });
85
86 jSpinnerRowHeight.addChangeListener(new ChangeListener() {
87 public void stateChanged(ChangeEvent e) {
88 int height =
89 ((Integer)(jSpinnerRowHeight.getValue())).intValue();
90 jTree1.setRowHeight(height);
91 jTree2.setRowHeight(height);
92 jTree3.setRowHeight(height);
93 jTree4.setRowHeight(height);
94 }
34