Java tutorial
/* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Oracle or the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package components; /* * ToolBarDemo2.java requires the following addditional files: * images/Back24.gif * images/Forward24.gif * images/Up24.gif */ import javax.swing.JToolBar; import javax.swing.JButton; import javax.swing.ImageIcon; import javax.swing.JTextField; import javax.swing.JFrame; import javax.swing.JTextArea; import javax.swing.JScrollPane; import javax.swing.JPanel; import javax.swing.UIManager; import javax.swing.SwingUtilities; import java.net.URL; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class ToolBarDemo2 extends JPanel implements ActionListener { protected JTextArea textArea; protected String newline = "\n"; static final private String PREVIOUS = "previous"; static final private String UP = "up"; static final private String NEXT = "next"; static final private String SOMETHING_ELSE = "other"; static final private String TEXT_ENTERED = "text"; public ToolBarDemo2() { super(new BorderLayout()); //Create the toolbar. JToolBar toolBar = new JToolBar("Still draggable"); addButtons(toolBar); toolBar.setFloatable(false); toolBar.setRollover(true); //Create the text area used for output. Request //enough space for 5 rows and 30 columns. textArea = new JTextArea(5, 30); textArea.setEditable(false); JScrollPane scrollPane = new JScrollPane(textArea); //Lay out the main panel. setPreferredSize(new Dimension(450, 130)); add(toolBar, BorderLayout.PAGE_START); add(scrollPane, BorderLayout.CENTER); } protected void addButtons(JToolBar toolBar) { JButton button = null; //first button button = makeNavigationButton("Back24", PREVIOUS, "Back to previous something-or-other", "Previous"); toolBar.add(button); //second button button = makeNavigationButton("Up24", UP, "Up to something-or-other", "Up"); toolBar.add(button); //third button button = makeNavigationButton("Forward24", NEXT, "Forward to something-or-other", "Next"); toolBar.add(button); //separator toolBar.addSeparator(); //fourth button button = new JButton("Another button"); button.setActionCommand(SOMETHING_ELSE); button.setToolTipText("Something else"); button.addActionListener(this); toolBar.add(button); //fifth component is NOT a button! JTextField textField = new JTextField("A text field"); textField.setColumns(10); textField.addActionListener(this); textField.setActionCommand(TEXT_ENTERED); toolBar.add(textField); } protected JButton makeNavigationButton(String imageName, String actionCommand, String toolTipText, String altText) { //Look for the image. String imgLocation = "images/" + imageName + ".gif"; URL imageURL = ToolBarDemo2.class.getResource(imgLocation); //Create and initialize the button. JButton button = new JButton(); button.setActionCommand(actionCommand); button.setToolTipText(toolTipText); button.addActionListener(this); if (imageURL != null) { //image found button.setIcon(new ImageIcon(imageURL, altText)); } else { //no image found button.setText(altText); System.err.println("Resource not found: " + imgLocation); } return button; } public void actionPerformed(ActionEvent e) { String cmd = e.getActionCommand(); String description = null; // Handle each button. if (PREVIOUS.equals(cmd)) { //first button clicked description = "taken you to the previous <something>."; } else if (UP.equals(cmd)) { // second button clicked description = "taken you up one level to <something>."; } else if (NEXT.equals(cmd)) { // third button clicked description = "taken you to the next <something>."; } else if (SOMETHING_ELSE.equals(cmd)) { // fourth button clicked description = "done something else."; } else if (TEXT_ENTERED.equals(cmd)) { // text field JTextField tf = (JTextField) e.getSource(); String text = tf.getText(); tf.setText(""); description = "done something with this text: " + newline + " \"" + text + "\""; } displayResult("If this were a real app, it would have " + description); } protected void displayResult(String actionDescription) { textArea.append(actionDescription + newline); textArea.setCaretPosition(textArea.getDocument().getLength()); } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event dispatch thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("ToolBarDemo2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add content to the window. frame.add(new ToolBarDemo2()); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event dispatch thread: //creating and showing this application's GUI. SwingUtilities.invokeLater(new Runnable() { public void run() { //Turn off metal's use of bold fonts UIManager.put("swing.boldMetal", Boolean.FALSE); createAndShowGUI(); } }); } }