SerialPortChooserDialog.java
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import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Enumeration;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import gnu.io.CommPortIdentifier;
public class SerialPortChooserDialog extends JDialog implements ActionListener, ListSelectionListener {
private static final long serialVersionUID = 1L;
private boolean onlyOneChoice;
private boolean emptyChoice;
private ArrayList<String> portNames;
private String choosedPort = null;
private JList<String> list;
private JButton ok;
private JButton cancel;
private SerialPortChooserDialog() {
Enumeration<?> portEnum = CommPortIdentifier.getPortIdentifiers();
portNames = new ArrayList<>();
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
portNames.add(currPortId.getName());
}
onlyOneChoice = portNames.size() <= 1;
emptyChoice = portNames.size() == 0;
if(onlyOneChoice || emptyChoice)
return;
// JDialog creation
JPanel mainPanel = new JPanel(new BorderLayout());
setModal(true);
setTitle("Serial port chooser");
// title
mainPanel.add(new JLabel("Choose a serial port : "), BorderLayout.NORTH);
// list ports
DefaultListModel<String> listModel = new DefaultListModel<>();
for(String str : portNames)
listModel.addElement(str);
list = new JList<>(listModel);
list.addListSelectionListener(this);
list.setVisibleRowCount(3);
list.setLayoutOrientation(JList.VERTICAL);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
JScrollPane scrollPane = new JScrollPane(list, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setPreferredSize(new Dimension(200, 100));
mainPanel.add(scrollPane, BorderLayout.CENTER);
// buttons ok / cancel
JPanel borderLayoutPanel = new JPanel(new BorderLayout());
JPanel buttonsLayout = new JPanel(new FlowLayout(FlowLayout.LEADING, 5, 3));
ok = new JButton("Ok");
cancel = new JButton("Cancel");
ok.addActionListener(this);
cancel.addActionListener(this);
ok.setEnabled(false);
buttonsLayout.add(cancel);
buttonsLayout.add(ok);
borderLayoutPanel.add(buttonsLayout, BorderLayout.EAST);
mainPanel.add(borderLayoutPanel, BorderLayout.SOUTH);
// padding
JPanel padding = new JPanel(new FlowLayout(FlowLayout.LEADING, 5, 5));
padding.add(mainPanel);
add(padding);
setResizable(false);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
public static String showSerialPortChooserDialog() throws NoSerialPortException {
SerialPortChooserDialog dialog = new SerialPortChooserDialog();
if(dialog.emptyChoice)
throw new NoSerialPortException();
if(dialog.onlyOneChoice)
return dialog.portNames.get(0);
return dialog.choosedPort;
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == ok) {
choosedPort = list.getSelectedValue();
dispose();
} else if(e.getSource() == cancel) {
dispose();
}
}
@Override
public void valueChanged(ListSelectionEvent e) {
if(e.getSource() == list) {
ok.setEnabled(list.getSelectedIndex() != -1);
}
}
}