source: josm/src/org/openstreetmap/josm/gui/dialogs/SelectionListDialog.java@ 22

package org.openstreetmap.josm.gui.dialogs;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.util.Collection;

import javax.swing.DefaultListCellRenderer;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.SelectionChangedListener;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.visitor.SelectionComponentVisitor;
import org.openstreetmap.josm.gui.ImageProvider;
import org.openstreetmap.josm.gui.MapFrame;

/**
 * A small tool dialog for displaying the current selection. The selection manager
 * respects clicks into the selection list. Ctrl-click will remove entries from
 * the list while single click will make the clicked entry the only selection.
 * 
 * @author imi
 */
public class SelectionListDialog extends ToggleDialog implements SelectionChangedListener {

        /**
         * The selection's list data.
         */
        private final DefaultListModel list = new DefaultListModel();
        /**
         * The display list.
         */
        private JList displaylist = new JList(list);
        
        /**
         * Create a SelectionList dialog.
         * @param mapView The mapView to get the dataset from.
         */
        public SelectionListDialog(MapFrame mapFrame) {
                super(mapFrame, "Current Selection", "Selection List", "selectionlist", KeyEvent.VK_E, "Open a selection list window.");
                setLayout(new BorderLayout());
                setSize(300,400);
                displaylist.setCellRenderer(new DefaultListCellRenderer(){
                        private SelectionComponentVisitor visitor = new SelectionComponentVisitor();
                        @Override
                        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
                                Component c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
                                if (c instanceof JLabel && value != null) {
                                        ((OsmPrimitive)value).visit(visitor);
                                        ((JLabel)c).setText(visitor.name);
                                        ((JLabel)c).setIcon(visitor.icon);
                                }
                                return c;
                        }
                });
                displaylist.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

                getContentPane().add(new JScrollPane(displaylist), BorderLayout.CENTER);

                JButton button = new JButton("Select", ImageProvider.get("mapmode", "selection"));
                button.setToolTipText("Set the selected elements on the map to the selected items in the list above.");
                button.addActionListener(new ActionListener(){
                        public void actionPerformed(ActionEvent e) {
                                updateMap();
                        }
                });
                getContentPane().add(button, BorderLayout.SOUTH);

                selectionChanged(Main.main.ds.getSelected());
        }

        @Override
        public void setVisible(boolean b) {
                if (b) {
                        Main.main.ds.addSelectionChangedListener(this);
                        selectionChanged(Main.main.ds.getSelected());
                } else {
                        Main.main.ds.removeSelectionChangedListener(this);
                }
                super.setVisible(b);
        }



        /**
         * Called when the selection in the dataset changed.
         * @param newSelection The new selection array.
         */
        public void selectionChanged(Collection<OsmPrimitive> newSelection) {
                list.removeAllElements();
                list.setSize(newSelection.size());
                int i = 0;
                for (OsmPrimitive osm : newSelection)
                        list.setElementAt(osm, i++);
        }

        /**
         * Sets the selection of the map to the current selected items.
         */
        public void updateMap() {
                Main.main.ds.clearSelection();
                for (int i = 0; i < list.getSize(); ++i)
                        if (displaylist.isSelectedIndex(i))
                                ((OsmPrimitive)list.get(i)).setSelected(true);
                Main.main.getMapFrame().repaint();
        }
}