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; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.awt.image.BufferedImage; /* * FrameDemo2.java shows off the window decoration features added in * 1.4, plus some window positioning code and (optionally) * setIconImage. It uses the file images/FD.jpg. */ public class FrameDemo2 extends WindowAdapter implements ActionListener { private Point lastLocation = null; private int maxX = 500; private int maxY = 500; //the main frame's default button private static JButton defaultButton = null; //constants for action commands protected final static String NO_DECORATIONS = "no_dec"; protected final static String LF_DECORATIONS = "laf_dec"; protected final static String WS_DECORATIONS = "ws_dec"; protected final static String CREATE_WINDOW = "new_win"; protected final static String DEFAULT_ICON = "def_icon"; protected final static String FILE_ICON = "file_icon"; protected final static String PAINT_ICON = "paint_icon"; //true if the next frame created should have no window decorations protected boolean noDecorations = false; //true if the next frame created should have setIconImage called protected boolean specifyIcon = false; //true if the next frame created should have a custom painted icon protected boolean createIcon = false; //Perform some initialization. public FrameDemo2() { Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); maxX = screenSize.width - 50; maxY = screenSize.height - 50; } //Create a new MyFrame object and show it. public void showNewWindow() { JFrame frame = new MyFrame(); //Take care of the no window decorations case. //NOTE: Unless you really need the functionality //provided by JFrame, you would usually use a //Window or JWindow instead of an undecorated JFrame. if (noDecorations) { frame.setUndecorated(true); } //Set window location. if (lastLocation != null) { //Move the window over and down 40 pixels. lastLocation.translate(40, 40); if ((lastLocation.x > maxX) || (lastLocation.y > maxY)) { lastLocation.setLocation(0, 0); } frame.setLocation(lastLocation); } else { lastLocation = frame.getLocation(); } //Calling setIconImage sets the icon displayed when the window //is minimized. Most window systems (or look and feels, if //decorations are provided by the look and feel) also use this //icon in the window decorations. if (specifyIcon) { if (createIcon) { frame.setIconImage(createFDImage()); //create an icon from scratch } else { frame.setIconImage(getFDImage()); //get the icon from a file } } //Show window. frame.setSize(new Dimension(170, 100)); frame.setVisible(true); } // Create the window-creation controls that go in the main window. protected JComponent createOptionControls() { JLabel label1 = new JLabel("Decoration options for subsequently created frames:"); ButtonGroup bg1 = new ButtonGroup(); JLabel label2 = new JLabel("Icon options:"); ButtonGroup bg2 = new ButtonGroup(); //Create the buttons JRadioButton rb1 = new JRadioButton(); rb1.setText("Look and feel decorated"); rb1.setActionCommand(LF_DECORATIONS); rb1.addActionListener(this); rb1.setSelected(true); bg1.add(rb1); // JRadioButton rb2 = new JRadioButton(); rb2.setText("Window system decorated"); rb2.setActionCommand(WS_DECORATIONS); rb2.addActionListener(this); bg1.add(rb2); // JRadioButton rb3 = new JRadioButton(); rb3.setText("No decorations"); rb3.setActionCommand(NO_DECORATIONS); rb3.addActionListener(this); bg1.add(rb3); // // JRadioButton rb4 = new JRadioButton(); rb4.setText("Default icon"); rb4.setActionCommand(DEFAULT_ICON); rb4.addActionListener(this); rb4.setSelected(true); bg2.add(rb4); // JRadioButton rb5 = new JRadioButton(); rb5.setText("Icon from a JPEG file"); rb5.setActionCommand(FILE_ICON); rb5.addActionListener(this); bg2.add(rb5); // JRadioButton rb6 = new JRadioButton(); rb6.setText("Painted icon"); rb6.setActionCommand(PAINT_ICON); rb6.addActionListener(this); bg2.add(rb6); //Add everything to a container. Box box = Box.createVerticalBox(); box.add(label1); box.add(Box.createVerticalStrut(5)); //spacer box.add(rb1); box.add(rb2); box.add(rb3); // box.add(Box.createVerticalStrut(15)); //spacer box.add(label2); box.add(Box.createVerticalStrut(5)); //spacer box.add(rb4); box.add(rb5); box.add(rb6); //Add some breathing room. box.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); return box; } //Create the button that goes in the main window. protected JComponent createButtonPane() { JButton button = new JButton("New window"); button.setActionCommand(CREATE_WINDOW); button.addActionListener(this); defaultButton = button; //Used later to make this the frame's default button. //Center the button in a panel with some space around it. JPanel pane = new JPanel(); //use default FlowLayout pane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); pane.add(button); return pane; } //Handle action events from all the buttons. public void actionPerformed(ActionEvent e) { String command = e.getActionCommand(); //Handle the New window button. if (CREATE_WINDOW.equals(command)) { showNewWindow(); //Handle the first group of radio buttons. } else if (NO_DECORATIONS.equals(command)) { noDecorations = true; JFrame.setDefaultLookAndFeelDecorated(false); } else if (WS_DECORATIONS.equals(command)) { noDecorations = false; JFrame.setDefaultLookAndFeelDecorated(false); } else if (LF_DECORATIONS.equals(command)) { noDecorations = false; JFrame.setDefaultLookAndFeelDecorated(true); //Handle the second group of radio buttons. } else if (DEFAULT_ICON.equals(command)) { specifyIcon = false; } else if (FILE_ICON.equals(command)) { specifyIcon = true; createIcon = false; } else if (PAINT_ICON.equals(command)) { specifyIcon = true; createIcon = true; } } //Creates an icon-worthy Image from scratch. protected static Image createFDImage() { //Create a 16x16 pixel image. BufferedImage bi = new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB); //Draw into it. Graphics g = bi.getGraphics(); g.setColor(Color.BLACK); g.fillRect(0, 0, 15, 15); g.setColor(Color.RED); g.fillOval(5, 3, 6, 6); //Clean up. g.dispose(); //Return it. return bi; } //Returns an Image or null. protected static Image getFDImage() { java.net.URL imgURL = FrameDemo2.class.getResource("images/FD.jpg"); if (imgURL != null) { return new ImageIcon(imgURL).getImage(); } else { return null; } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Use the Java look and feel. try { UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName()); } catch (Exception e) { } //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); JDialog.setDefaultLookAndFeelDecorated(true); //Instantiate the controlling class. JFrame frame = new JFrame("FrameDemo2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. FrameDemo2 demo = new FrameDemo2(); //Add components to it. Container contentPane = frame.getContentPane(); contentPane.add(demo.createOptionControls(), BorderLayout.CENTER); contentPane.add(demo.createButtonPane(), BorderLayout.PAGE_END); frame.getRootPane().setDefaultButton(defaultButton); //Display the window. frame.pack(); frame.setLocationRelativeTo(null); //center it frame.setVisible(true); } //Start the demo. public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } class MyFrame extends JFrame implements ActionListener { //Create a frame with a button. public MyFrame() { super("A window"); setDefaultCloseOperation(DISPOSE_ON_CLOSE); //This button lets you close even an undecorated window. JButton button = new JButton("Close window"); button.addActionListener(this); //Place the button near the bottom of the window. Container contentPane = getContentPane(); contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.PAGE_AXIS)); contentPane.add(Box.createVerticalGlue()); //takes all extra space contentPane.add(button); button.setAlignmentX(Component.CENTER_ALIGNMENT); //horizontally centered contentPane.add(Box.createVerticalStrut(5)); //spacer } //Make the button do the same thing as the default close operation //(DISPOSE_ON_CLOSE). public void actionPerformed(ActionEvent e) { setVisible(false); dispose(); } } }