Java tutorial
/* * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* * ListSelectorDialog.java * Copyright (C) 1999-2012 University of Waikato, Hamilton, New Zealand * */ package weka.gui; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.regex.Pattern; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.DefaultListModel; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JList; import javax.swing.JOptionPane; import javax.swing.JScrollPane; /** * A dialog to present the user with a list of items, that the user can * make a selection from, or cancel the selection. * * @author Len Trigg (trigg@cs.waikato.ac.nz) * @version $Revision$ */ public class ListSelectorDialog extends JDialog { /** for serialization */ private static final long serialVersionUID = 906147926840288895L; /** Click to choose the currently selected property */ protected JButton m_SelectBut = new JButton("Select"); /** Click to cancel the property selection */ protected JButton m_CancelBut = new JButton("Cancel"); /** Click to enter a regex pattern for selection */ protected JButton m_PatternBut = new JButton("Pattern"); /** The list component */ protected JList m_List; /** Whether the selection was made or cancelled */ protected int m_Result; /** Signifies an OK property selection */ public static final int APPROVE_OPTION = 0; /** Signifies a cancelled property selection */ public static final int CANCEL_OPTION = 1; /** The current regular expression. */ protected String m_PatternRegEx = ".*"; /** * Create the list selection dialog. * * @param parentFrame the parent window of the dialog * @param userList the JList component the user will select from */ public ListSelectorDialog(Window parentFrame, JList userList) { super(parentFrame, "Select items", ModalityType.DOCUMENT_MODAL); m_List = userList; m_CancelBut.setMnemonic('C'); m_CancelBut.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { m_Result = CANCEL_OPTION; setVisible(false); } }); m_SelectBut.setMnemonic('S'); m_SelectBut.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { m_Result = APPROVE_OPTION; setVisible(false); } }); m_PatternBut.setMnemonic('P'); m_PatternBut.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { selectPattern(); } }); Container c = getContentPane(); c.setLayout(new BorderLayout()); // setBorder(BorderFactory.createTitledBorder("Select a property")); Box b1 = new Box(BoxLayout.X_AXIS); b1.add(m_SelectBut); b1.add(Box.createHorizontalStrut(10)); b1.add(m_PatternBut); b1.add(Box.createHorizontalStrut(10)); b1.add(m_CancelBut); c.add(b1, BorderLayout.SOUTH); c.add(new JScrollPane(m_List), BorderLayout.CENTER); getRootPane().setDefaultButton(m_SelectBut); pack(); // make sure, it's not bigger than the screen Dimension screen = Toolkit.getDefaultToolkit().getScreenSize(); int width = getWidth() > screen.getWidth() ? (int) screen.getWidth() : getWidth(); int height = getHeight() > screen.getHeight() ? (int) screen.getHeight() : getHeight(); setSize(width, height); setLocationRelativeTo(parentFrame); } /** * Pops up the modal dialog and waits for cancel or a selection. * * @return either APPROVE_OPTION, or CANCEL_OPTION */ public int showDialog() { m_Result = CANCEL_OPTION; int[] origSelected = m_List.getSelectedIndices(); setVisible(true); if (m_Result == CANCEL_OPTION) { m_List.setSelectedIndices(origSelected); } return m_Result; } /** * opens a separate dialog for entering a regex pattern for selecting * elements from the provided list */ protected void selectPattern() { String pattern = JOptionPane.showInputDialog(m_PatternBut.getParent(), "Enter a Perl regular expression ('.*' for all)", m_PatternRegEx); if (pattern != null) { try { Pattern.compile(pattern); m_PatternRegEx = pattern; m_List.clearSelection(); for (int i = 0; i < m_List.getModel().getSize(); i++) { if (Pattern.matches(pattern, m_List.getModel().getElementAt(i).toString())) m_List.addSelectionInterval(i, i); } } catch (Exception ex) { JOptionPane.showMessageDialog(m_PatternBut.getParent(), "'" + pattern + "' is not a valid Perl regular expression!\n" + "Error: " + ex, "Error in Pattern...", JOptionPane.ERROR_MESSAGE); } } } /** * Tests out the list selector from the command line. * * @param args ignored */ public static void main(String[] args) { try { DefaultListModel lm = new DefaultListModel(); lm.addElement("one"); lm.addElement("two"); lm.addElement("three"); lm.addElement("four"); lm.addElement("five"); JList jl = new JList(lm); final ListSelectorDialog jd = new ListSelectorDialog(null, jl); int result = jd.showDialog(); if (result == ListSelectorDialog.APPROVE_OPTION) { System.err.println("Fields Selected"); int[] selected = jl.getSelectedIndices(); for (int i = 0; i < selected.length; i++) { System.err.println("" + selected[i] + " " + lm.elementAt(selected[i])); } } else { System.err.println("Cancelled"); } System.exit(0); } catch (Exception ex) { ex.printStackTrace(); System.err.println(ex.getMessage()); } } }