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"GUI Design Patterns"
Vol. 9, Issue 7, p. 48
Listing 1
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
/**
* The ListChooser implements the "Add-and-Remove"
* GUI design pattern.
*/
public class ListChooser extends JPanel
implements ActionListener
{
/** @serial Original list. */
private JList _originalList = null;
/** @serial Chosen list. */
private JList _chosenList = null;
/** @serial Original label. */
private JLabel _originalLabel = null;
/** @serial Chosen label. */
private JLabel _chosenLabel = null;
/** @serial "Add" button. */
private JButton _add = null;
/** @serial "Remove" button. */
private JButton _remove = null;
/** @serial "Add All" button. */
private JButton _addAll = null;
/** @serial "Remove All" button. */
private JButton _removeAll = null;
/**
* Constructor.
* <p>
* @param original original objects
* @param chosen chosen objects
*/
public ListChooser( Object[] original, Object[] chosen )
{
// Create Lists and ListModels.
super();
setFocusable( true );
DefaultListModel originalModel =
new DefaultListModel();
DefaultListModel chosenModel =
new DefaultListModel();
for( int i = 0; ( i < original.length ); i++ )
originalModel.addElement( original[ i ]);
for( int i = 0; ( i < chosen.length ); i++ )
chosenModel.addElement( chosen[ i ]);
_originalList = new JList( originalModel );
_chosenList = new JList( chosenModel );
// Place lists.
setLayout( new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.BOTH;
c.weightx = 1.0;
c.weighty = 1.0;
c.gridwidth = 1;
c.gridheight = 4;
c.gridy = 1;
c.gridx = 0;
JScrollPane pane = new JScrollPane( _originalList );
_originalList.setVisibleRowCount( 7 );
pane.setPreferredSize( new Dimension( 80, _originalList.
getPreferredScrollableViewportSize().height ));
add( pane, c );
c.gridx = 2;
pane = new JScrollPane( _chosenList );
_chosenList.setVisibleRowCount( 7 );
pane.setPreferredSize( new Dimension( 80, _chosenList.
getPreferredScrollableViewportSize().height ));
add( pane, c );
// Place labels.
_originalLabel = new JLabel( "Original:" );
_chosenLabel = new JLabel( "Chosen:" );
c.weighty = 0.0;
c.gridheight = 1;
c.gridy = 0;
c.gridx = 0;
add( _originalLabel, c );
c.gridx = 2;
add( _chosenLabel, c );
// Place buttons.
_add = new JButton( "Add" );
_add.setMnemonic( 'A' );
_addAll = new JButton( "Add All" );
_remove = new JButton( "Remove" );
_removeAll = new JButton( "Remove All" );
c.weightx = 0.0;
c.weighty = 1.0;
c.gridx = 1;
c.gridy = 1;
c.anchor = GridBagConstraints.SOUTH;
add( _add, c );
c.gridy = 3;
add( _remove, c );
c.anchor = GridBagConstraints.NORTH;
c.gridy = 2;
add( _addAll, c );
c.gridy = 4;
add( _removeAll, c );
// Attach listeners.
_add.addActionListener( this );
_addAll.addActionListener( this );
_remove.addActionListener( this );
_removeAll.addActionListener( this );
}
/**
* Action event listener.
* <p>
* @param e ActionEvent
*/
public void actionPerformed( ActionEvent e )
{
// Get models and command.
DefaultListModel originalModel =
_originalList.getModel();
DefaultListModel chosenModel =
_chosenList.getModel();
String command = e.getActionCommand();
// Add selected objects to the chosen list...
if( command.equals( _add.getText()))
{ Object[] values =
_originalList.getSelectedValues();
for( int i = 0; ( i < values.length ); i++ )
{ chosenModel.addElement( values[ i ]);
originalModel.removeElement( values[ i ]);
}
}
// ...or add all objects to the chosen list...
else if( command.equals( _addAll.getText()))
{ Object[] values = originalModel.toArray();
for( int i = 0; ( i < values.length ); i++ )
chosenModel.addElement( values[ i ]);
originalModel.clear();
}
// ...or remove selected objects to original list...
else if( command.equals( _remove.getText()))
{ Object[] values =
_chosenList.getSelectedValues();
for( int i = 0; ( i < values.length ); i++ )
{ originalModel.addElement( values[ i ]);
chosenModel.removeElement( values[ i ]);
}
}
// ...or remove all objects to the original list...
else if( command.equals( _removeAll.getText()))
{ Object[] values = chosenModel.toArray();
for( int i = 0; ( i < values.length ); i++ )
originalModel.addElement( values[ i ]);
chosenModel.clear();
}
}
}
Listing 2
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
/**
* The TableChooser implements the "Add-and-Remove" GUI
* design pattern and displays the chosen list as a table.
*/
public class TableChooser extends JPanel
implements ActionListener
{
/** @serial Original table. */
private JTable _originalTable = null;
/** @serial Chosen table. */
private JTable _chosenTable = null;
.
.
.
/**
* Constructor.
* <p>
* @param original original objects
* @param chosen chosen objects
* @param columnNames column names
*/
public TableChooser( Object[][] original,
Object[][] chosen, Object[] columnNames )
{
// Create Tables and TableModels.
super();
setFocusable( true );
DefaultTableModel originalModel =
new DefaultTableModel( original, columnNames );
DefaultTableModel chosenModel =
new DefaultTableModel( chosen, columnNames );
_originalTable = new JTable( originalModel );
_originalTable.setTableHeader( null );
_originalTable.setShowGrid( false );
_chosenTable = new JTable( chosenModel );
// Place tables in scroll panes of appropriate width.
TableColumnModel tcm =
_originalTable.getColumnModel();
TableColumn tc = tcm.getColumn( 0 );
_originalWidth = tc.getPreferredWidth();
tc.setMinWidth( _originalWidth );
_originalTable.setPreferredScrollableViewportSize(
new Dimension( _originalWidth,
10 * _originalTable.getRowHeight()));
_chosenTable.setPreferredScrollableViewportSize(
new Dimension( tcm.getTotalColumnWidth(),
10 * _chosenTable.getRowHeight()));
JScrollPane originalPane =
new JScrollPane( _originalTable );
originalPane.getViewport().setBackground( Color.white );
originalPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS );
JScrollPane chosenPane =
new JScrollPane( _chosenTable );
chosenPane.getViewport().setBackground( Color.white );
chosenPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS );
.
.
.
}
/**
* Action event listener.
* <p>
* @param e ActionEvent
*/
public void actionPerformed( ActionEvent e )
{
// Get models and command.
DefaultTableModel originalModel =
_originalTable.getModel();
DefaultTableModel chosenModel =
_chosenTable.getModel();
String command = e.getActionCommand();
// Add selected objects to the chosen table...
if( command.equals( _add.getText()))
{ int[] indices = _originalTable.getSelectedRows();
Vector v = originalModel.getDataVector();
for( int i = 0; ( i < indices.length ); i++ )
chosenModel.addRow(
( Vector )v.elementAt( indices[ i ]));
for( int i = indices.length - 1; ( i >= 0 ); i-- )
originalModel.removeRow( indices[ i ]);
}
// ...or add all objects to the chosen table...
else if( command.equals( _addAll.getText()))
{ Vector v = originalModel.getDataVector();
for( int i = 0; ( i < v.size()); i++ )
chosenModel.addRow(
( Vector )v.elementAt( i ));
originalModel.setRowCount( 0 );
}
// ...or remove selected objects to original table...
else if( command.equals( _remove.getText()))
{ int[] indices = _chosenTable.getSelectedRows();
Vector v = chosenModel.getDataVector();
for( int i = 0; ( i < indices.length ); i++ )
originalModel.addRow(
( Vector )v.elementAt( indices[ i ]));
for( int i = indices.length - 1; ( i >= 0 ); i-- )
chosenModel.removeRow( indices[ i ]);
}
// ...or remove all objects to the original table.
else if( command.equals( _removeAll.getText()))
{ Vector v = chosenModel.getDataVector();
for( int i = 0; ( i < v.size()); i++ )
originalModel.addRow(
( Vector )v.elementAt( i ));
chosenModel.setRowCount( 0 );
}
}
}
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