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JTree Expansion
jhon meshek
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Posts: 4
posted 16 years ago
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Hi All,
How to load data instantly when i click on "+" ?
Any suggestion would be appreciated.
Thanks in Advance
Craig Wood
Ranch Hand
Posts: 1535
posted 16 years ago
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For a JTree use a DefaultTreeModel like this
import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.tree.*; public class TreeLoading implements ActionListener { JTree tree; public void actionPerformed(ActionEvent e) { DefaultTreeModel model = (DefaultTreeModel)tree.getModel(); DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot(); int nextRow = model.getChildCount(root); int[] indices = new int[10]; for(int j = nextRow, k = 0; j < nextRow+10; j++) { DefaultMutableTreeNode node = new DefaultMutableTreeNode("Node " + j); model.insertNodeInto(node, root, j); indices[k++] = j; if(j == 0) tree.expandRow(0); } } private JScrollPane getTreeComponent() { tree = new JTree(); DefaultTreeModel model = new DefaultTreeModel(new DefaultMutableTreeNode("root")); tree.setModel(model); return new JScrollPane(tree); } private JPanel getLast() { JButton button = new JButton("add data"); button.addActionListener(this); JPanel panel = new JPanel(); panel.add(button); return panel; } public static void main(String[] args) { TreeLoading test = new TreeLoading(); JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(test.getTreeComponent()); f.getContentPane().add(test.getLast(), "Last"); f.setSize(400,400); f.setLocation(200,200); f.setVisible(true); } }
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