source: src/main/java/genius/gui/panels/SubsetSelectionPanelPlus.java

package genius.gui.panels;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;

import genius.core.listener.Listener;

/**
 * {@link SubsetSelectionPanel} with additional border, indicator of number of
 * selected items, and clear button
 * 
 */
@SuppressWarnings("serial")
public class SubsetSelectionPanelPlus<ItemType> extends VflowPanelWithBorder {

        private JLabel infolabel = new JLabel("0 selected");
        private SubsetSelectionModel<ItemType> model;
        private SubsetSelectionPanel<ItemType> listpanel;

        public SubsetSelectionPanelPlus(final String title, final SubsetSelectionModel<ItemType> model) {

                super(title);
                this.model = model;
                updateInfo();

                JPanel panel = new JPanel(new BorderLayout());
                panel.setMaximumSize(new Dimension(999999999, 30));
                panel.add(infolabel, BorderLayout.WEST);
                JButton clearButton = new JButton("Clear");
                panel.add(clearButton, BorderLayout.EAST);

                listpanel = new SubsetSelectionPanel<>(model);
                add(new JScrollPane(listpanel));
                add(panel);

                model.addListener(new Listener<ItemType>() {
                        @Override
                        public void notifyChange(ItemType data) {
                                updateInfo();
                        }
                });

                clearButton.addActionListener(new ActionListener() {
                        @Override
                        public void actionPerformed(ActionEvent e) {
                                model.clear();
                        }
                });

        }

        /**
         * Set the cell renderer.
         * 
         * @param renderer
         *            the renderer for list elements
         * 
         */
        public void setCellRenderer(ListCellRenderer<ItemType> renderer) {
                listpanel.setCellRenderer(renderer);
        }

        private void updateInfo() {
                // FIXME invokelater
                infolabel.setText("" + model.getSelectedItems().size() + " selected");
        }

        /**
         * simple stub to run this stand-alone (for testing).
         * 
         * @param args
         */
        public static void main(String[] args) {
                final JFrame gui = new JFrame();
                gui.setLayout(new BorderLayout());
                List<String> allItems = Arrays.asList("een", "twee", "drie", "vier");
                SubsetSelectionModel<String> model = new SubsetSelectionModel<String>(allItems);
                gui.getContentPane().add(new SubsetSelectionPanelPlus<String>("Paneel", model), BorderLayout.CENTER);
                gui.pack();
                gui.setVisible(true);

        }

}