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The following example demonstrates JTree It creates a small tree that shows the derivation of several Swing components In this example, the node that represents JComponent is the root Subtrees representing buttons and text components are then added
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// Demonstrate JTree import import import import javaawt*; javaxswing*; javaxswingevent*; javaxswingtree*;
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class TreeDemo { JLabel jlab; TreeDemo() { // Create a new JFrame container JFrame jfrm = new JFrame("JTree Demo"); // Specify FlowLayout for the layout manager jfrmsetLayout(new FlowLayout()); // Give the frame an initial size jfrmsetSize(260, 240); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create a label that will display the tree selection // and set its size jlab = new JLabel(); jlabsetPreferredSize(new Dimension(230, 50)); // Create a tree that shows the relationship of several // Swing classes // First, create the root node of the tree DefaultMutableTreeNode root = new DefaultMutableTreeNode("JComponent"); // Next, create two subtrees One begins with // AbstractButton and the other with JTextComponent // Create the root of the AbstractButton subtree DefaultMutableTreeNode absBtnNode = new DefaultMutableTreeNode("AbstractButton"); rootadd(absBtnNode); // add the AbstractButton node to the tree // // // // The AbstractButton subtree has two nodes: JButton and JToggleButton Under JToggleButton are JCheckBox and JRadioButton These nodes are created by the following statements
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// Create the nodes under AbstractButton DefaultMutableTreeNode jbtnNode = new DefaultMutableTreeNode("JButton"); absBtnNodeadd(jbtnNode); // add JButton to AbstractButton DefaultMutableTreeNode jtoggleNode = new DefaultMutableTreeNode("JToggleButton"); absBtnNodeadd(jtoggleNode); // add JToggleButton to AbstractButton // Add a subtree under JToggleButton jtoggleNodeadd(new DefaultMutableTreeNode("JCheckBox")); jtoggleNodeadd(new DefaultMutableTreeNode("JRadioButton")); // Now, create a JTextComponent subtree DefaultMutableTreeNode jtxtCompNode = new DefaultMutableTreeNode("JTextComponent"); rootadd(jtxtCompNode); // add JTextComponent to the root // Populate the JTextComponent subtree DefaultMutableTreeNode jtxtFieldNode = new DefaultMutableTreeNode("JTextField"); jtxtCompNodeadd(jtxtFieldNode); jtxtCompNodeadd(new DefaultMutableTreeNode("JTextArea")); jtxtCompNodeadd(new DefaultMutableTreeNode("JEditorPane")); // Create a subtree under JTextField jtxtFieldNodeadd(new DefaultMutableTreeNode("JFormattedTextField")); jtxtFieldNodeadd(new DefaultMutableTreeNode("JPasswordField")); // Now, create a JTree that uses the structure // defined by the preceding statements JTree jtree = new JTree(root); // Allow the tree to be edited so that model // events can be generated jtreesetEditable(true); // Set the tree selection mode to single-selection TreeSelectionModel tsm = jtreegetSelectionModel(); tsmsetSelectionMode(TreeSelectionModelSINGLE_TREE_SELECTION); // Wrap the tree in a scroll pane JScrollPane jscrlp = new JScrollPane(jtree); // Set the preferred size of the scroll pane jscrlpsetPreferredSize(new Dimension(160, 140)); // Listen for tree expansion events jtreeaddTreeExpansionListener(new TreeExpansionListener() { public void treeExpanded(TreeExpansionEvent tee) { // Get the path to the expansion point TreePath tp = teegetPath();
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// Display the node jlabsetText("Expansion: " + tpgetLastPathComponent()); } public void treeCollapsed (TreeExpansionEvent tee) { // Get the path to the expansion point TreePath tp = teegetPath(); // Display the node jlabsetText("Collapse: " + tpgetLastPathComponent()); } }); // Listen for tree selection events jtreeaddTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent tse) { // Get the path to the selection TreePath tp = tsegetPath(); // Display the selected node jlabsetText("Selection event: " + tpgetLastPathComponent()); } }); // Listen for tree model events Notice that the // listener is registered with the tree model jtreegetModel()addTreeModelListener(new TreeModelListener() { public void treeNodesChanged(TreeModelEvent tme) { // Get the path to the parent of the node that changed TreePath tp = tmegetTreePath(); // Get the children of the parent of the node that changed Object[] children = tmegetChildren(); DefaultMutableTreeNode changedNode; if(children != null) changedNode = (DefaultMutableTreeNode) children[0]; else changedNode = (DefaultMutableTreeNode) tpgetLastPathComponent();
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// Display the path jlabsetText("<html>Model change path: " + tp + "<br>" + "New data: " + changedNodegetUserObject()); }
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// Empty implementations of the remaining TreeModelEvent // methods Implement these if your application // needs to handle these actions public void treeNodesInserted(TreeModelEvent tme) {} public void treeNodesRemoved(TreeModelEvent tme) {} public void treeStructureChanged(TreeModelEvent tme) {} }); // Add the tree and label to the content pane jfrmadd(jscrlp); jfrmadd(jlab); // Display the frame jfrmsetVisible(true); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new TreeDemo(); } }); } }
The output is shown here:
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