java2 Swing

import javax.swing.*; import javax.swing.text.*; import javax.swing.border.*; import java.awt.*; import java.awt.event.*; import java.net.URL; import java.io.*; import java.util.*; public class GridBagLab extends JFrame { static String lastFile = null; static ConstraintsPanel cp; static JTextArea helpTextArea = new JTextArea(contentsOfFile("intro.txt")); JDesktopPane desktop = new JDesktopPane(); JInternalFrame buttonsFrame = new JInternalFrame("Buttons", true, false, true, false); JInternalFrame constraintsFrame = new JInternalFrame("Constraints", false, false, true, true); JInternalFrame helpFrame = new JInternalFrame("GridBag Constraints Explained", true, false, true, true); final GridBagLayout gbl = new GridBagLayout(); ButtonGroup group = new ButtonGroup(); JToggleButton selected = null; JToggleButton oneButton = new JToggleButton(), twoButton = new JToggleButton(), threeButton = new JToggleButton(), fourButton = new JToggleButton(), fiveButton = new JToggleButton(), sixButton = new JToggleButton(), sevenButton = new JToggleButton(), eightButton = new JToggleButton(), nineButton = new JToggleButton(), tenButton = new JToggleButton(); public GridBagLab() { super("GridBag Lab"); JMenuBar mb = new JMenuBar(); JMenu fileMenu = new JMenu("File"); JMenuItem aboutItem = new JMenuItem("about ..."); JMenuItem quitItem = new JMenuItem("quit"); final AboutDialog aboutDialog = new AboutDialog(this); fileMenu.add(aboutItem); fileMenu.add(quitItem); mb.add(fileMenu); setJMenuBar(mb); aboutItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Point loc = getLocation(); aboutDialog.pack(); aboutDialog.setLocation(loc.x + 100, loc.y + 100); aboutDialog.setVisible(true); } }); quitItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); GridBagConstraints gbc = new GridBagConstraints(); ButtonListener listener = new ButtonListener(); oneButton.setIcon(new ImageIcon("gifs/one.gif")); oneButton.addActionListener(listener); twoButton.setIcon(new ImageIcon("gifs/two.gif")); twoButton.addActionListener(listener); threeButton.setIcon(new ImageIcon("gifs/three.gif")); threeButton.addActionListener(listener); fourButton.setIcon(new ImageIcon("gifs/four.gif")); fourButton.addActionListener(listener); fiveButton.setIcon(new ImageIcon("gifs/five.gif")); fiveButton.addActionListener(listener); sixButton.setIcon(new ImageIcon("gifs/six.gif")); sixButton.addActionListener(listener); sevenButton.setIcon(new ImageIcon("gifs/seven.gif")); sevenButton.addActionListener(listener); eightButton.setIcon(new ImageIcon("gifs/eight.gif")); eightButton.addActionListener(listener); nineButton.setIcon(new ImageIcon("gifs/nine.gif")); nineButton.addActionListener(listener); tenButton.setIcon(new ImageIcon("gifs/ten.gif")); tenButton.addActionListener(listener); oneButton.setFocusPainted(false); twoButton.setFocusPainted(false); threeButton.setFocusPainted(false); fourButton.setFocusPainted(false); fiveButton.setFocusPainted(false); sixButton.setFocusPainted(false); sevenButton.setFocusPainted(false); eightButton.setFocusPainted(false); nineButton.setFocusPainted(false); tenButton.setFocusPainted(false); group.add(oneButton); group.add(twoButton); group.add(threeButton); group.add(fourButton); group.add(fiveButton); group.add(sixButton); group.add(sevenButton); group.add(eightButton); group.add(nineButton); group.add(tenButton); Container contentPane = getContentPane(); desktop.add(buttonsFrame); desktop.add(constraintsFrame); desktop.add(helpFrame); contentPane.setLayout(new BorderLayout()); contentPane.add(desktop, "Center"); JPanel buttonsPanel = new JPanel(); buttonsFrame.getContentPane().add(buttonsPanel, "Center"); buttonsPanel.setLayout(gbl); gbc.anchor = GridBagConstraints.NORTHWEST; gbc.fill = GridBagConstraints.BOTH; gbc.weightx = 1.0; gbc.weighty = 1.0; gbc.gridx = 0; gbc.gridy = 0; buttonsPanel.add(oneButton, gbc); gbc.gridx = GridBagConstraints.RELATIVE; gbc.gridy = 0; buttonsPanel.add(twoButton, gbc); buttonsPanel.add(threeButton, gbc); gbc.gridx = 0; gbc.gridy = GridBagConstraints.RELATIVE; buttonsPanel.add(fourButton, gbc); gbc.gridx = GridBagConstraints.RELATIVE; gbc.gridy = 1; buttonsPanel.add(fiveButton, gbc); buttonsPanel.add(sixButton, gbc); gbc.gridx = 0; gbc.gridy = GridBagConstraints.RELATIVE; buttonsPanel.add(sevenButton, gbc); gbc.gridx = GridBagConstraints.RELATIVE; gbc.gridy = 2; buttonsPanel.add(eightButton, gbc); buttonsPanel.add(nineButton, gbc); gbc.gridx = 0; gbc.gridy = GridBagConstraints.RELATIVE; buttonsPanel.add(tenButton, gbc); Container constraintsPane = constraintsFrame.getContentPane(); constraintsPane.add(cp = new ConstraintsPanel()); //constraintsFrame.pack(); constraintsFrame.setSize(250,600); Dimension constraintsSize = constraintsFrame.getSize(); setBounds(300,100,500, constraintsSize.height); Point buttonsLocation = buttonsFrame.getLocation(); Dimension buttonsSize = buttonsFrame.getSize(); buttonsFrame.setBounds(0,0,350,350); helpFrame.setBounds(0,352,350+constraintsSize.width,buttonsFrame.getSize().height+2); helpTextArea.setWrapStyleWord(true); helpTextArea.setEditable(false); helpTextArea.setFont( new Font("Times-Roman", Font.PLAIN, 12)); helpFrame.getContentPane().add( new JScrollPane(helpTextArea), "Center"); } public void setHelpViewer(String filename) { if(lastFile == null || !lastFile.equals(filename)) { helpTextArea.setText(contentsOfFile(filename)); lastFile = filename; } } public void setConstraints(GridBagConstraints gbc) { if(selected != null) { gbl.setConstraints(selected, gbc); selected.invalidate(); validate(); } } public GridBagConstraints getConstraints() { GridBagConstraints gbc = null; if(selected != null) gbc = gbl.getConstraints(selected); return gbc; } class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { selected = (JToggleButton)e.getSource(); cp.setConstraints(gbl.getConstraints(selected)); } } static String contentsOfFile(String filename) { String s = new String(); File f; char[] buff = new char[50000]; InputStream is; InputStreamReader reader; URL url; try { f = new File(filename); reader = new FileReader(f); int nch; while (( nch = reader.read(buff, 0, buff.length)) != -1) { s = s + new String(buff, 0, nch); } } catch (java.io.IOException ex) { s = "Could not load file: " + filename; } return s; } class ConstraintsDialog extends JInternalFrame { public ConstraintsDialog(GridBagLab test) { super("GridBagConstraints"); getContentPane().add(new ConstraintsPanel()); } } class ConstraintsPanel extends JPanel { AnchorFillWeightPanel afpanel = new AnchorFillWeightPanel(); DisplayAreaPanel dpanel = new DisplayAreaPanel(); PaddingPanel ppanel = new PaddingPanel(); InsetsPanel ipanel = new InsetsPanel(); String dpaneltip = "display area attributes", afpaneltip = "component attributes", ppaneltip = "padding"; public ConstraintsPanel() { setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); add(dpanel); add(Box.createVerticalStrut(15)); add(afpanel); add(Box.createVerticalStrut(15)); add(ppanel); add(Box.createVerticalStrut(15)); add(ipanel); add(Box.createVerticalStrut(15)); } public void setConstraints