TableLayout

Die unten gezeigte Klasse "TableLayout" ermöglicht das Anordnen von Swing Komponenten in Form einer Tabelle. "TableLayoutDemo" zeigt ein Beispiel, wie sie verwendet werden kann: <code=java> /*

* TableLayoutDemo.java
*/

import java.awt.*; import java.util.*; import javax.swing.*;

public class TableLayoutDemo extends JFrame {

   private TableLayout tableLayout;
   private final Random r;

   public TableLayoutDemo() {
       super("TableLayout Demo");
       r = new Random();
       setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
       setSize(600, 600);
       setLocationRelativeTo(null);
       //create empty TableLayout:
       tableLayout = new TableLayout();
       //fill the TableLayout:
       for (int row = 0; row < 5; row++) {
           //create a test panel:
           JPanel panel = createTestPanel(row);
           //add to TableLayout:
           tableLayout.addRow(panel);
       }
       getContentPane().add(new JScrollPane(tableLayout), BorderLayout.CENTER);
   }

   private JPanel createTestPanel(int row) {
       JPanel panel = new JPanel();
       panel.add(new JLabel("Panel " + row));
       //generate random height for testing only:
       int height = r.nextInt(200);
       if (height < 34) {
           height = 34;
       }
       panel.setPreferredSize(new Dimension(0, height));
       return panel;
   }

   public static void main(final String[] args) {
       EventQueue.invokeLater(new Runnable() {

           public void run() {
               new TableLayoutDemo().setVisible(true);
           }
       });

   }

} </code=java> <code=java> /*

* TableLayout.java
*/

import java.awt.*; import java.awt.event.*; import java.io.*; import java.util.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*;

public class TableLayout extends JTable {

   /**
    * Constructs a TableLayout with 0 rows and 0 columns
    */
   public TableLayout() {
       super(0, 0);
       setDefaultRenderer(JComponent.class, new TableLayoutRenderer());
       setDefaultEditor(JComponent.class, new TableLayoutEditor());
       setSurrendersFocusOnKeystroke(true);
   }

   @Override
   public TableCellRenderer getCellRenderer(final int row, final int column) {
       TableColumn tableColumn = getColumnModel().getColumn(column);
       TableCellRenderer renderer = tableColumn.getCellRenderer();
       if (renderer == null) {
           Class c = getColumnClass(column);
           if (c.equals(Object.class)) {
               Object o = getValueAt(row, column);
               if (o != null) {
                   c = getValueAt(row, column).getClass();
               }
           }
           renderer = getDefaultRenderer(c);
       }
       return renderer;
   }

   @Override
   public TableCellEditor getCellEditor(final int row, final int column) {
       TableColumn tableColumn = getColumnModel().getColumn(column);
       TableCellEditor editor = tableColumn.getCellEditor();
       if (editor == null) {
           Class c = getColumnClass(column);
           if (c.equals(Object.class)) {
               Object o = getValueAt(row, column);
               if (o != null) {
                   c = getValueAt(row, column).getClass();
               }
           }
           editor = getDefaultEditor(c);
       }
       return editor;
   }

   /**
    *
    * @param columnNames one or more names to be added as columns
    */
   public void addColumns(final String... columnNames) {
       DefaultTableModel model = (DefaultTableModel) getModel();
       for (String name : columnNames) {
           model.addColumn(name);
       }
   }

   /**
    * 
    * @param components one or more components to be added as a row
    */
   public void addRow(final JComponent... components) {
       DefaultTableModel model = (DefaultTableModel) getModel();
       while (model.getColumnCount() < components.length) {
           model.addColumn("");
       }
       model.addRow(components);
       int h = 0;
       for (JComponent comp : components) {
           int h2 = comp.getPreferredSize().height;
           if (h < h2) {
               h = h2;
           }
       }
       setRowHeight(getRowCount() - 1, h);
   }

   class TableLayoutEditor implements TableCellEditor, Serializable {

       protected EventListenerList listenerList = new EventListenerList();
       protected transient ChangeEvent changeEvent = null;
       protected JComponent editorComponent = null;

       public Component getComponent() {
           return editorComponent;
       }
       /* implement CellEditor:
       getCellEditorValue
       isCellEditable
       shouldSelectCell
       stopCellEditing
       cancelCellEditing
       addCellEditorListener
       removeCellEditorListener
        */

       @Override
       public Object getCellEditorValue() {
           return editorComponent;
       }

       @Override
       public boolean isCellEditable(final EventObject anEvent) {
           return true;
       }

       @Override
       public boolean shouldSelectCell(final EventObject anEvent) {
           if (editorComponent != null && anEvent instanceof MouseEvent
                   && ((MouseEvent) anEvent).getID() == MouseEvent.MOUSE_PRESSED) {
               Component dispatchComponent =
                       SwingUtilities.getDeepestComponentAt(editorComponent, 3, 3);
               MouseEvent e = (MouseEvent) anEvent;
               MouseEvent e2 = new MouseEvent(dispatchComponent,
                       MouseEvent.MOUSE_RELEASED, e.getWhen() + 100000,
                       e.getModifiers(), 3, 3, e.getClickCount(), e.isPopupTrigger());
               dispatchComponent.dispatchEvent(e2);
               e2 = new MouseEvent(dispatchComponent, MouseEvent.MOUSE_CLICKED,
                       e.getWhen() + 100001, e.getModifiers(), 3, 3, 1, e.isPopupTrigger());
               dispatchComponent.dispatchEvent(e2);
           }
           return true;
       }

       @Override
       public boolean stopCellEditing() {
           fireEditingStopped();
           return true;
       }

       @Override
       public void cancelCellEditing() {
           fireEditingCanceled();
       }

       @Override
       public void addCellEditorListener(final CellEditorListener l) {
           listenerList.add(CellEditorListener.class, l);
       }

       @Override
       public void removeCellEditorListener(final CellEditorListener l) {
           listenerList.remove(CellEditorListener.class, l);
       }

       protected void fireEditingStopped() {//used in stopCellEditing
           Object[] listeners = listenerList.getListenerList();
           // Process the listeners last to first, notifying
           // those that are interested in this event
           for (int i = listeners.length - 2; i >= 0; i -= 2) {
               if (listeners[i] == CellEditorListener.class) {
                   // Lazily create the event:
                   if (changeEvent == null) {
                       changeEvent = new ChangeEvent(this);
                   }
                   ((CellEditorListener) listeners[i + 1]).editingStopped(changeEvent);
               }
           }
       }

       protected void fireEditingCanceled() {//used in cancelCellEditing
           // Guaranteed to return a non-null array
           Object[] listeners = listenerList.getListenerList();
           // Process the listeners last to first, notifying
           // those that are interested in this event
           for (int i = listeners.length - 2; i >= 0; i -= 2) {
               if (listeners[i] == CellEditorListener.class) {
                   // Lazily create the event:
                   if (changeEvent == null) {
                       changeEvent = new ChangeEvent(this);
                   }
                   ((CellEditorListener) listeners[i + 1]).editingCanceled(changeEvent);
               }
           }
       }

// implement TableCellEditor:

       @Override
       public Component getTableCellEditorComponent(final JTable table,
               final Object value, final boolean isSelected,
               final int row, final int column) {
           editorComponent = (JComponent) value;
           return editorComponent;
       }
   }

   class TableLayoutRenderer implements TableCellRenderer {

       @Override
       public Component getTableCellRendererComponent(final JTable table,
               final Object value, final boolean isSelected,
               final boolean hasFocus, final int row, final int column) {
           return (JComponent) value;
       }
   }

} </code=java>