JTable mit Buttons in Tabellenzellen

<code=java> import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; import javax.swing.table.*;

/**

* The ButtonHandler class handles JTable buttons. Usage example:

*

*

 * class MyTable extends JTable {
 * 
 *     private ButtonHandler btHandler;
 * 
 *     MyTable() {
 *         super(10, 4);
 *         String[] butonNames = {"Button1", "Button2", "Button3"};
 *         Object[] buttonPositions = new Object[]{new int[]{0, 0}, new int[]{0, 1}, new int[]{0, 2}};
 *         for (int i = 0; i < buttonPositions.length; i++) {
 *             int[] pos = (int[]) buttonPositions[i];
 *             setValueAt(butonNames[i], pos[0], pos[1]);
 *         }
 *         Action action = new AbstractAction() {
 *             public void actionPerformed(final ActionEvent e) {
 *                 String[] buttonPosition = e.getActionCommand().split(",");
 *                 int row = Integer.parseInt(buttonPosition[0]);
 *                 int column = Integer.parseInt(buttonPosition[1]);
 *                 System.out.println("row = " + row + ", column = " + column);
 *             }
 *         };
 *         btHandler = new ButtonHandler(this, action, buttonPositions);
 *     }
 *     public TableCellRenderer getCellRenderer(final int row, final int column) {
 *         return btHandler.getRenderer(row, column);
 *     }
 *     public TableCellEditor getCellEditor(final int row, final int column) {
 *         return btHandler.getEditor(row, column);
 *     }
 * }
 * 

*

* @author André Uhres */ class ButtonHandler { private JTable table; private Action action; private Border originalBorder; private Border focusBorder; private final Editor buttonEditor; private final Renderer buttonRenderer; private final Object[] buttonPositions; /** * Creates a ButtonHandler for the JTable passed as parameter. * @param table * @param action the action to be performed by the buttons * @param buttonPositions an array of int[] row-column pairs representing the button positions */ ButtonHandler(final JTable table, final Action action, final Object[] buttonPositions) { this.table = table; this.action = action; buttonRenderer = new Renderer(); buttonEditor = new Editor(); this.buttonPositions = buttonPositions; } /** * @param row * @param column * @return the TableCellEditor for the cell at row-column */ public TableCellEditor getEditor(final int row, final int column) { TableColumn tableColumn = table.getColumnModel().getColumn(column); TableCellEditor editor = tableColumn.getCellEditor(); if (editor == null) { for (int i = 0; i < buttonPositions.length; i++) { int[] pos = (int[]) buttonPositions[i]; if (pos[0] == row && pos[1] == column) { return buttonEditor; } } Class c = table.getColumnClass(column); if (c.equals(Object.class)) { Object o = table.getValueAt(row, column); if (o != null) { c = table.getValueAt(row, column).getClass(); } } editor = table.getDefaultEditor(c); } return editor; } /** * @param row * @param column * @return the TableCellRenderer for the cell at row-column */ public TableCellRenderer getRenderer(final int row, final int column) { TableColumn tableColumn = table.getColumnModel().getColumn(column); TableCellRenderer renderer = tableColumn.getCellRenderer(); if (renderer == null) { for (int i = 0; i < buttonPositions.length; i++) { int[] pos = (int[]) buttonPositions[i]; if (pos[0] == row && pos[1] == column) { return buttonRenderer; } } Class c = table.getColumnClass(column); if (c.equals(Object.class)) { Object o = table.getValueAt(row, column); if (o != null) { c = table.getValueAt(row, column).getClass(); } } renderer = table.getDefaultRenderer(c); } return renderer; } private class Renderer implements TableCellRenderer { private JButton renderButton = new JButton(); @Override public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { if (isSelected) { renderButton.setForeground(table.getSelectionForeground()); renderButton.setBackground(table.getSelectionBackground()); } else { renderButton.setForeground(table.getForeground()); renderButton.setBackground(UIManager.getColor("Button.background")); } if (hasFocus) { renderButton.setBorder(focusBorder); } else { renderButton.setBorder(originalBorder); } if (value == null) { renderButton.setText(""); renderButton.setIcon(null); } else if (value instanceof Icon) { renderButton.setText(""); renderButton.setIcon((Icon) value); } else { renderButton.setText(value.toString()); renderButton.setIcon(null); } return renderButton; } } private class Editor extends AbstractCellEditor implements TableCellEditor { private JButton editButton; private Object editorValue; private Editor() { editButton = new JButton(); editButton.setFocusPainted(false); editButton.addActionListener(new ActionListener() { @Override public void actionPerformed(final ActionEvent e) { int row = table.convertRowIndexToModel(table.getEditingRow()); int column = table.convertColumnIndexToModel(table.getEditingColumn()); buttonEditor.stopCellEditing(); ActionEvent event = new ActionEvent(table, ActionEvent.ACTION_PERFORMED, row + "," + column); action.actionPerformed(event); } }); originalBorder = editButton.getBorder(); focusBorder = new LineBorder(Color.BLUE); editButton.setBorder(focusBorder); } @Override public Component getTableCellEditorComponent( JTable table, Object value, boolean isSelected, int row, int column) { if (value == null) { editButton.setText(""); editButton.setIcon(null); } else if (value instanceof Icon) { editButton.setText(""); editButton.setIcon((Icon) value); } else { editButton.setText(value.toString()); editButton.setIcon(null); } this.editorValue = value; return editButton; } @Override public Object getCellEditorValue() { return editorValue; } } } </code=java>