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POCustom TableCellEditor only working on 1 Column Dispite applied to all
 

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  1. POCustom TableCellEditor only working on 1 Column Dispite applied to all
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    <p>I have a rather complex JTable I'm working on. The number of rows and columns are build off a list. Then depending on what column of what row the cell editor needs to change out. While Goggling for a solution I found this: <a href="http://www.java2s.com/Code/Java/Swing-Components/EachRowwithdifferentEditorExample.htm" rel="nofollow">http://www.java2s.com/Code/Java/Swing-Components/EachRowwithdifferentEditorExample.htm</a></p> <p>I took that code as it was and run it just to make sure it was working the current Java versions and it did. So i worked it into my JTable i had already build, but what seems to be happening is when I go to apply it to multiple columns it only ends up working for the first column.</p> <p>I put together a fully executable section of code that I have commented and set up to simulate my database data. The code is pretty decently commented so should be easy to follow. This sample does at least for me still produces the problem.</p> <p>If any of you can see whats wrong I would greatly appreciate the help.</p> <pre><code>import java.awt.*; import java.awt.event.*; import java.util.List; import java.util.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class EachRowEditorExample extends JFrame { public EachRowEditorExample() { super("EachRow Editor Example"); List&lt;Membership&gt; _Memberships = new ArrayList&lt;Membership&gt;(); DefaultTableModel DataModel; //Lets Start by simluating the data. for (int z = -2; z &lt; 10; z++) { Membership m = new Membership(); m.setId(z); if (z == -2) { m.setMembership("Employee"); m.setEft(false); } else if (z == -1) { m.setMembership("NONE"); m.setEft(false); } else { m.setMembership("Membership " + z); if (z &lt; 3 ) m.setEft(true); else m.setEft(false); } _Memberships.add(m); } //******************************************************* // Starts Copy and paste from Program //******************************************************* //lets build our Data Model int size = _Memberships.size(); Object[][] rows = new Object[size][]; String[] cols = new String[size]; int x = 0; for(Iterator&lt;Membership&gt; i = _Memberships.iterator(); i.hasNext(); ) { Membership side = i.next(); cols[x] = side.getMembership(); Object[] row = new Object[size]; int b = 0; for(Iterator&lt;Membership&gt; j = _Memberships.iterator(); j.hasNext(); ) { Membership top = j.next(); if (side.getId() == top.getId() &amp;&amp; (side.isEft() &amp;&amp; top.isEft())) { row[b] = null; } else row[b] = NUHPADX(side.getId(), top.getId()); b++; } rows[x] = row; x++; } DataModel = new DefaultTableModel(rows,cols); //Now Lets create our JTable and configure it. JTable table = new JTable(DataModel) { @Override public boolean isCellEditable(int rowIndex, int columnIndex) { Object t = getValueAt(rowIndex, rowIndex); if (t == null) return false; else return true; } @Override public Component prepareRenderer(TableCellRenderer renderer, int row, int column) { Component c = super.prepareRenderer(renderer, row, column); Object t = getValueAt(row, column); if (t == null) { c.setBackground(Color.black); } else { Color PRIMARY_ROW_COLOR = Color.white; Color ALTERNATE_ROW_COLOR = new Color(0xA9F1ED); //even index, selected or not selected if (row % 2 == 0) { if (column % 2 == 0) c.setBackground(PRIMARY_ROW_COLOR.darker()); else c.setBackground(PRIMARY_ROW_COLOR); } else { if (column % 2 == 0) c.setBackground(ALTERNATE_ROW_COLOR.darker()); else c.setBackground(ALTERNATE_ROW_COLOR); } } return c; } }; table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); table.getTableHeader().setReorderingAllowed(false); JList rowHeader = new JList(cols); rowHeader.setCellRenderer(new RowHeaderRenderer(table)); //Lets Place the new table in a Scroll Pane Since there could be alot of data. JScrollPane scrollPane = new JScrollPane(table); scrollPane.setRowHeaderView(rowHeader); getContentPane().add(scrollPane, BorderLayout.CENTER); //Now lets Build the Cell Editors int c = 0; int r = 0; for(Iterator&lt;Membership&gt; a = _Memberships.iterator(); a.hasNext();) { Membership top = a.next(); EachRowEditor rowEditor = new EachRowEditor(table); for(Iterator&lt;Membership&gt; b = _Memberships.iterator(); b.hasNext();) { Membership side = b.next(); if (side.getId() == top.getId() &amp;&amp; (side.isEft() &amp;&amp; top.isEft())) { //rowEditor.setEditorAt(r, null); } else if (side.getId() != top.getId() &amp;&amp; (side.isEft() &amp;&amp; top.isEft())) { NuhpadxCell t = new NuhpadxCell(side, top, new DefaultComboBoxModel(new String[] {"N", "U", "D", "A"})); t.setSelectedItem(NUHPADX(side.getId(), top.getId())); rowEditor.setEditorAt(r, new DefaultCellEditor(t)); } else { NuhpadxCell t = new NuhpadxCell(side, top, new DefaultComboBoxModel(new String[] {"N", "A", "H", "X", "P"})); t.setSelectedItem(NUHPADX(side.getId(), top.getId())); rowEditor.setEditorAt(r, new DefaultCellEditor(t)); } r++; } table.getColumn(top.getMembership()).setCellEditor(rowEditor); table.revalidate(); c++; } table.removeColumn(table.getColumn("NONE")); //******************************************************* // Ends Copy and paste from Program //******************************************************* setSize(1060, 600); setVisible(true); } //This function jsut simluates a entire class public String NUHPADX(int side, int top) { Random generator = new Random(); int roll = generator.nextInt(7); switch (roll) { case 0: return "N"; case 1: return "U"; case 2: return "H"; case 3: return "P"; case 4: return "A"; case 5: return "P"; case 6: return "A"; default: return "N"; } } public static void main(String[] args) { EachRowEditorExample frame = new EachRowEditorExample(); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); } } //Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html /* (swing1.1.1) */ class EachRowEditor implements TableCellEditor { protected Hashtable editors; protected TableCellEditor editor, defaultEditor; JTable table; /** * Constructs a EachRowEditor. create default editor * * @see TableCellEditor * @see DefaultCellEditor */ public EachRowEditor(JTable table) { this.table = table; editors = new Hashtable(); defaultEditor = new DefaultCellEditor(new JTextField()); } /** * @param row * table row * @param editor * table cell editor */ public void setEditorAt(int row, TableCellEditor editor) { editors.put(new Integer(row), editor); } public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) { editor = (TableCellEditor) editors.get(new Integer(row)); if (editor == null) { editor = defaultEditor; } return editor.getTableCellEditorComponent(table, value, isSelected, row, column); } public Object getCellEditorValue() { return editor.getCellEditorValue(); } public boolean stopCellEditing() { return editor.stopCellEditing(); } public void cancelCellEditing() { editor.cancelCellEditing(); } public boolean isCellEditable(EventObject anEvent) { selectEditor((MouseEvent) anEvent); return editor.isCellEditable(anEvent); } public void addCellEditorListener(CellEditorListener l) { editor.addCellEditorListener(l); } public void removeCellEditorListener(CellEditorListener l) { editor.removeCellEditorListener(l); } public boolean shouldSelectCell(EventObject anEvent) { selectEditor((MouseEvent) anEvent); return editor.shouldSelectCell(anEvent); } protected void selectEditor(MouseEvent e) { int row; if (e == null) { row = table.getSelectionModel().getAnchorSelectionIndex(); } else { row = table.rowAtPoint(e.getPoint()); } editor = (TableCellEditor)editors.get(new Integer(row)); if (editor == null) { editor = defaultEditor; } } } //******************************************************* // Starts Copy and paste from Program //******************************************************* class RowHeaderRenderer extends JLabel implements ListCellRenderer { private static final long serialVersionUID = 4619707414623897299L; public RowHeaderRenderer(JTable table) { JTableHeader header = table.getTableHeader(); setOpaque(true); setBorder(UIManager.getBorder("TableHeader.cellBorder")); setHorizontalAlignment(CENTER); setForeground(header.getForeground()); setBackground(header.getBackground()); setFont(header.getFont()); } @Override public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { setText((value == null) ? "" : value.toString()); return this; } } class NuhpadxCell extends JComboBox { private static final long serialVersionUID = -4464709511574911230L; private Membership _side; private Membership _top; public NuhpadxCell(Membership s, Membership t, DefaultComboBoxModel aModel) { _side = s; _top = t; addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { DoUpdate(); } }); setModel(aModel); } private void DoUpdate() { // I would then update my database useing the ID of the side and top memberships as keys. } } //******************************************************* // Ends Copy and paste from Program //******************************************************* //A bare Skeleton of the membership class needed to run this code. class Membership { protected int id; protected String membership; protected boolean eft; public int getId() { return id; } public void setId(int value) { this.id = value; } public String getMembership() { return membership; } public void setMembership(String value) { this.membership = value; } public boolean isEft() { return eft; } public void setEft(boolean value) { this.eft = value; } } </code></pre>
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    1. COare you meaning `Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException` from codel line `return editor.isCellEditable(anEvent);`
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