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POHow do I update a JPanel with information from a different class?
 

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  1. POHow do I update a JPanel with information from a different class?
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    <p>I created the following example source and am wondering what I need to do to update my JPanel with a JLabel that has the information located from the row clicked in the JTable.</p> <p>I also wanted to note that this is just a bare example as I've improved the sample code quite a bit thanks to a few SO members here. So I'm posting this bare example as a way to learn</p> <p>SwingTesting (main)</p> <pre><code>public class SwingTesting { private final JFrame frame; private final TablePane tablePane; private final JSplitPane splitPane; private final JPanel infoPanel; private final JLabel infoLabel; public SwingTesting() { tablePane = new TablePane(); infoPanel = new JPanel(); frame = new JFrame(); infoLabel = new JLabel(); //this is the panel i want to add the label to infoPanel.add(infoLabel); splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, tablePane, infoPanel); frame.add(splitPane); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new SwingTesting(); } }); } } </code></pre> <p>TablePane </p> <pre><code>public class TablePane extends JPanel { private final JTable table; private final TableModel tableModel; private final ListSelectionModel listSelectionModel; public TablePane() { table = new JTable(); tableModel = createTableModel(); table.setModel(tableModel); table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION); table.add(table.getTableHeader(), BorderLayout.PAGE_START); table.setFillsViewportHeight(true); listSelectionModel = table.getSelectionModel(); table.setSelectionModel(listSelectionModel); listSelectionModel.addListSelectionListener(new SharedListSelectionHandler()); table.setSelectionModel(listSelectionModel); this.setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.anchor = GridBagConstraints.NORTHWEST; gbc.fill = GridBagConstraints.BOTH; gbc.gridx = 0; gbc.gridy = 0; gbc.gridheight = 1; gbc.gridwidth = 3; gbc.insets = new Insets(5, 5, 5, 5); gbc.ipadx = 2; gbc.ipady = 2; gbc.weightx = 1; gbc.weighty = 1; this.add(new JScrollPane(table), gbc); } private TableModel createTableModel() { DefaultTableModel model = new DefaultTableModel( new Object[] {"Car", "Color", "Year"}, 0 ){ @Override public boolean isCellEditable(int row, int column) { return false; } }; addTableData(model); return model; } private void addTableData(DefaultTableModel model) { model.addRow(new Object[] {"Nissan", "Black", "2007"}); model.addRow(new Object[] {"Toyota", "Blue", "2012"}); model.addRow(new Object[] {"Chevrolet", "Red", "2009"}); model.addRow(new Object[] {"Scion", "Silver", "2005"}); model.addRow(new Object[] {"Cadilac", "Grey", "2001"}); } class SharedListSelectionHandler implements ListSelectionListener { //When selection changes i want to add a label to the panel //currently it just prints out the info from the selected row @Override public void valueChanged(ListSelectionEvent e) { ListSelectionModel lsm = (ListSelectionModel) e.getSource(); String contents = ""; if(lsm.isSelectionEmpty()) { System.out.println("&lt;none&gt;"); } else { int minIndex = lsm.getMinSelectionIndex(); int maxIndex = lsm.getMaxSelectionIndex(); for(int i = minIndex; i &lt;= maxIndex; i++) { if(lsm.isSelectedIndex(i)) { for(int j = 0; j &lt; table.getColumnCount(); j++) { contents += table.getValueAt(i, j) + " "; } } } System.out.println(contents); } } } } </code></pre> <p>So I'm wondering how to access that JPanel from the ListSelectionListener. Should I just pass the panel to the TablePane class? Or is there a more proper way to do this?</p> <p>Also, my ListSelectionListener prints out the row information twice for some reason, did I mess up the loop?</p> <p><strong>EDIT</strong></p> <pre><code>public class TablePane extends JPanel { private final JTable table; private final TableModel tableModel; private final ListSelectionModel listSelectionModel; private final displayPanel; public TablePane() { //removed code for reading purposes } //IDE says issue with thinking displayPanel may have already been initialized public TablePane(JPanel panel) { //this(); //displayPanel = panel; } //ListSelectionListener uses panel.add(jlabel) } </code></pre> <p>Is it as simple as taking <code>final</code> off?</p>
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    1. PO
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    1. USWilliamShatner
    1. USWilliamShatner
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      1. POHow do I update a JPanel with information from a different class?
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    1. COthis question is too broad. please refine and ask a more specific question.
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      1. POHow do I update a JPanel with information from a different class?
      1. USmre
    2. COcreate reference on this JPanel from SwingTesting in your TablePane class (contructor will have one parameter) and in SwingTesting create getter on your JPanel.
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      1. POHow do I update a JPanel with information from a different class?
      1. USSimon Dorociak
    3. CO@Sajmon Thank you for the reply, I was thinking that was the way I'd have to do it. Was hoping there were also alternative ways as well.
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      1. POHow do I update a JPanel with information from a different class?
      1. USWilliamShatner
 

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