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POTableCellRenderer and how to refresh Cell background without using JTable.repaint()
 

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    <ul> <li><p>is possible to refresh background based on value from outside correctly, without to force for repaint <code>table.repaint();</code></p></li> <li><p><a href="https://stackoverflow.com/questions/9607670/how-do-i-correctly-use-custom-renderers-to-paint-specific-cells-in-a-jtable">Based, used and tested with great code made by kleopatra and Hovercraft Full Of Eels</a></p></li> <li><p>valid for Java6/7, because there weren't any changes in APIs</p></li> </ul> <p><img src="https://i.stack.imgur.com/M3LaS.jpg" alt="enter image description here"><img src="https://i.stack.imgur.com/0whRu.jpg" alt="enter image description here"><img src="https://i.stack.imgur.com/smTfm.jpg" alt="enter image description here"></p> <p>my SSCCE works correctly, repainted by <code>JTable.repaint()</code> </p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.GridLayout; import javax.swing.DefaultComboBoxModel; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.SwingUtilities; import javax.swing.border.EmptyBorder; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; public class MyTableAndRenderer { private JFrame frame = new JFrame(); private JPanel panel = new JPanel(); private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4"}; private DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel(items); private JComboBox combo = new JComboBox(comboBoxModel); private JPanel panel1 = new JPanel(); private String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"}; private Object[][] data = { {"Kathy", "Smith", "Item 1", new Integer(5), (false)}, {"John", "Doe", "Item 1", new Integer(3), (true)}, {"Sue", "Black", "Item 3", new Integer(2), (false)}, {"Jane", "White", "Item 3", new Integer(20), (true)}, {"Joe", "Brown", "Item 3", new Integer(10), (false)} }; private DefaultTableModel model = new DefaultTableModel(data, columnNames) { private static final long serialVersionUID = 1L; @Override public Class getColumnClass(int column) { return getValueAt(0, column).getClass(); } }; private JTable table = new JTable(model); public MyTableAndRenderer() { panel.setBorder(new EmptyBorder(10, 0, 2, 0)); panel.add(combo); //@HFOE /*table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); String str = combo.getSelectedItem().toString(); if (value.toString().equalsIgnoreCase(str)) { setBackground(Color.RED); } else { setBackground(null); } return this; } });*/ //@kleopatra /*table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { String str = combo.getSelectedItem().toString(); if (value.toString().equalsIgnoreCase(str)) { setBackground(Color.RED); } else { setBackground(null); } super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); return this; } });*/ table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); String str = combo.getSelectedItem().toString(); if (value.toString().equalsIgnoreCase(str)) { setBackground(Color.RED); table.repaint(); } else { setBackground(null); table.repaint(); } return this; } }); table.getTableHeader().setReorderingAllowed(false); table.setAutoCreateRowSorter(true); table.setPreferredScrollableViewportSize(table.getPreferredSize()); panel1.setLayout(new GridLayout(1, 1, 10, 10)); panel1.add(new JScrollPane(table)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(panel, BorderLayout.NORTH); frame.add(panel1); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { MyTableAndRenderer fs = new MyTableAndRenderer(); } }); } } </code></pre> <p>EDIT</p> <p>@Devolus wrote Did you test what I posted? I took this snippet from my own working code, I just removed the stuff inbetween as it is not relevant for the answer. I'm using Java 6 here and this works for me.</p> <pre><code>public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); ... determine the color value ... cell.setBackground(back); cell.setForeground(fore); } </code></pre> <ul> <li>caused</li> </ul> <p><img src="https://i.stack.imgur.com/2yn7n.jpg" alt="enter image description here"></p> <ul> <li>doesn't matter Java6/7</li> </ul> <p>from code (reason to post an SSCCE)</p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.GridLayout; import javax.swing.DefaultComboBoxModel; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.SwingUtilities; import javax.swing.border.EmptyBorder; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; public class MyTableAndRenderer { private JFrame frame = new JFrame(); private JPanel panel = new JPanel(); private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4"}; private DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel(items); private JComboBox combo = new JComboBox(comboBoxModel); private JPanel panel1 = new JPanel(); private String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"}; private Object[][] data = { {"Kathy", "Smith", "Item 1", new Integer(5), (false)}, {"John", "Doe", "Item 1", new Integer(3), (true)}, {"Sue", "Black", "Item 3", new Integer(2), (false)}, {"Jane", "White", "Item 3", new Integer(20), (true)}, {"Joe", "Brown", "Item 3", new Integer(10), (false)} }; private DefaultTableModel model = new DefaultTableModel(data, columnNames) { private static final long serialVersionUID = 1L; @Override public Class getColumnClass(int column) { return getValueAt(0, column).getClass(); } }; private JTable table = new JTable(model); public MyTableAndRenderer() { panel.setBorder(new EmptyBorder(10, 0, 2, 0)); panel.add(combo); table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); String str = combo.getSelectedItem().toString(); if (value.toString().equalsIgnoreCase(str)) { c.setBackground(Color.RED); } else { c.setBackground(null); } return this; } }); table.getTableHeader().setReorderingAllowed(false); table.setAutoCreateRowSorter(true); table.setPreferredScrollableViewportSize(table.getPreferredSize()); panel1.setLayout(new GridLayout(1, 1, 10, 10)); panel1.add(new JScrollPane(table)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(panel, BorderLayout.NORTH); frame.add(panel1); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { MyTableAndRenderer fs = new MyTableAndRenderer(); } }); } } </code></pre> <p>EDIT2</p> <ul> <li>from WinXp (for all Win OS don't to use Nimbus, Renderer is there very funny, never seen that, great!!! how is this possible)</li> </ul> <p><img src="https://i.stack.imgur.com/L1nWS.jpg" alt="enter image description here"></p> <p>EDIT3:</p> <p>note I'm simplified code as is possible, tested before my question here, then casting Rendering Component to JComponent/JLabel doesn't works too (with JLabel.repaint()/setOpaque())</p>
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    1. CO+1 for SSCCE...
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    2. COwe also had issues with jtable causing the renderer not to paint its content properly. We then deceided to use JXTable, which is offering the concept of highlighting cells with [Highlighters](http://download.java.net/javadesktop/swinglabs/releases/0.8/docs/api/org/jdesktop/swingx/decorator/Highlighter.html).
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    3. CO@ymene yeah, I agree with using SwingX (biased me :-) Two thingies: a) your reference is severely outdated (many changes in the Highlighter API since 0.8), unfortunately the current javadoc (of release 1.6.5-1) is not easily available, only via downloading the doc from maven b) internally, a higlighter fires a changeEvent when its decoration changes, which in turn triggers the table to repaint itself :)
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