Java Swing V2.1 Workshop Solutions

Java Swing Workshop Solutions

Java Swing: Workshop Solutions

Table of Contents

Workshop 2: Using Basic Components ........................................................................................i Workshop 3: Using Swing Containers .......................................................................................vii Workshop 4: Using Menus & ToolBars .....................................................................................xiv Workshop 5: Using Common Dialogs .....................................................................................xxiii Workshop 6: Using Borders ...................................................................................................xxxiv Workshop 7: Using Internal Frames..........................................................................................xlv Workshop 8: Using a List Model................................................................................................lvii

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Workshop 2: Using Basic Components

SwingApp.java // SwingApp.java // After Basic Components exercise. import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingApp { public static void main( String[] args ) { new MainWindow(args); } } class MainWindow extends Frame { private ToolBar toolBar; private StatusBar statusBar = new StatusBar(); private JTextArea textArea = new JTextArea(); // Constructor public MainWindow(String[] args) { super("Studentsoft Super System"); initLayout(); // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { quit(0); } } ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show();

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// Pop login dialog if "login" passed as 1st argument. // If user cancels or closes, close the application. if( args.length > 0 && args[0].toUpperCase().equals("LOGIN") ) if( ! login() ) quit(0); showStatus( "Hello!" ); } // login() pops the LoginDialog, returns true if // user clicks OK, false if user clicks Cancel // or closes. private boolean login() { // return true; boolean bOK[] = new boolean[1]; bOK[0] = false; new LoginDialog(bOK); return bOK[0]; } // Private methods private void cut() { textArea.cut(); showStatus("Text cut to clipboard"); } private void copy() { textArea.copy(); showStatus("Text copied to clipboard"); } private void paste() { textArea.paste(); showStatus("Text pasted from clipboard"); } private boolean quit(int retCode) { System.exit(retCode); return true; } private void initLayout() { toolBar = new ToolBar(); // Configure text area textArea.setLineWrap( true ); textArea.setWrapStyleWord( true ); textArea.setToolTipText("Enter / edit text here"); // Configure frame setBounds( 100, 100, 500, 300 ); add( BorderLayout.NORTH , toolBar ); add( BorderLayout.CENTER, textArea ); add( BorderLayout.SOUTH , statusBar ); } private void showStatus( String text ) {

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statusBar.showStatus( text ); } // INNER CLASSES // Inner class for status bar private class StatusBar extends Panel { private JLabel label = new JLabel( " ", JLabel.LEFT ); public StatusBar() { setLayout( new BorderLayout() ); setBackground( Color.lightGray ); label.setForeground( Color.black ); add( label, BorderLayout.SOUTH ); }

}

public void showStatus( String text ) { label.setText( " " + text ); doLayout(); } // end of StatusBar class

// Inner class for toolbar private class ToolBar extends Panel implements ActionListener { public ToolBar() { JButton btnCut = new JButton("Cut"); btnCut.setActionCommand("cut"); btnCut.setMnemonic('c'); btnCut.setToolTipText("Cut to clipboard"); btnCut.addActionListener( this ); JButton btnCopy = new JButton("Copy"); btnCopy.setActionCommand("copy"); btnCopy.setMnemonic('o'); btnCopy.setToolTipText("Copy to clipboard"); btnCopy.addActionListener( this ); JButton btnPaste = new JButton("Paste"); btnPaste.setActionCommand("paste"); btnPaste.setMnemonic('p'); btnPaste.setToolTipText("Paste from clipboard"); btnPaste.addActionListener( this ); setBackground( Color.lightGray ); setLayout( new FlowLayout( FlowLayout.LEFT )); add( btnCut ); add( btnCopy ); add( btnPaste ); } // Event handling for Cut, Copy and Paste buttons public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("cut") ) cut(); else if( ae.getActionCommand().equals("copy") ) copy(); else if( ae.getActionCommand().equals("paste") ) paste();

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}

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} // end of ToolBar class

// Login window private class LoginDialog extends Dialog implements ActionListener { boolean OKflag[]; JLabel labelUID JLabel labelPWD JTextField tfUID JTextField tfPWD JButton btnOK JButton btnCancel

= = = = = =

new new new new new new

JLabel("User ID:", JLabel.RIGHT); JLabel("Password:", JLabel.RIGHT); JTextField(); JTextField(); JButton("OK"); JButton("Cancel");

public LoginDialog( boolean[] OKflagI ) { super( MainWindow.this, "User Login", true ); OKflag = OKflagI; initLayout(); // Set up accelerators & mnemonics // For user ID field, use JTextField.setFocusAccelerator() tfUID.setFocusAccelerator( 'u' ); labelUID.setDisplayedMnemonic( 'u' ); // For password field, use JLabel.setLabelFor() labelPWD.setLabelFor( tfPWD ); labelPWD.setDisplayedMnemonic( 'p' ); // Set up action commands btnOK.setActionCommand("ok"); btnCancel.setActionCommand("cancel"); // Button event handling performed by LoginDialog btnOK.addActionListener( this ); btnCancel.addActionListener( this ); // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { we.getWindow().dispose(); } } ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); } public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("ok") ) OKflag[0] = true; dispose();

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} private void initLayout() { GridBagLayout gbl = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); setLayout( gbl ); setBounds( 100, 100, 300, 200 ); // Size & position dialog setResizable( false ); // Make dialog fixed size // Add UID label to login window gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelUID, gbc ); // apply constraints add( labelUID ); // Add PWD label to login window gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelPWD, gbc ); // apply constraints add( labelPWD ); // Add UID text field to login window gbc.gridx = 2; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfUID, gbc ); // apply constraints add( tfUID ); // Add PWD text field to login window gbc.gridx = 2; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfPWD, gbc ); // apply constraints add( tfPWD );

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// Add OK button to login window gbc.gridx = 1; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnOK, gbc ); // apply constraints add( btnOK ); // Add Cancel button to login window gbc.gridx = 2; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnCancel, gbc ); // apply constraints add( btnCancel ); tfUID.requestFocus(); } }

// Put focus on ID field

// end of initLayout()

// end of LoginWindow class

}

// end of MainWindow class

// // // // //

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c; for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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Workshop 3: Using Swing Containers

SwingApp.Java // SwingApp.java // After Swing Containers exercise. import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingApp { public static void main( String[] args ) { new MainWindow(args); } } class MainWindow extends JFrame { private ToolBar toolBar ; private StatusBar statusBar = new StatusBar(); private JTextArea textArea = new JTextArea(); // Constructor public MainWindow(String[] args) { super("Studentsoft Super System"); initLayout(); // Turn off default closing mechanism setDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE ); // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { quit(0); } } ); // Set font of entire frame just before showing.

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FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); // Pop login dialog if "login" passed as 1st argument. // If user cancels or closes, close the application. if( args.length > 0 && args[0].toUpperCase().equals("LOGIN") ) if( ! login() ) quit(0); showStatus( "Hello!" ); } // login() pops the LoginDialog, returns true if // user clicks OK, false if user clicks Cancel // or closes. private boolean login() { // return true; boolean bOK[] = new boolean[1]; bOK[0] = false; new LoginDialog(bOK); return bOK[0]; } // Private methods private void cut() { textArea.cut(); showStatus("Text cut to clipboard"); } private void copy() { textArea.copy(); showStatus("Text copied to clipboard"); } private void paste() { textArea.paste(); showStatus("Text pasted from clipboard"); } private boolean quit(int retCode) { System.exit(retCode); return true; } private void initLayout() { toolBar = new ToolBar(); // Configure text area textArea.setLineWrap( true ); textArea.setWrapStyleWord( true ); textArea.setToolTipText("Enter / edit text here"); // Configure frame setBounds( 100, 100, 500, 300 ); getContentPane().add( BorderLayout.NORTH , getContentPane().add( BorderLayout.CENTER, getContentPane().add( BorderLayout.SOUTH ,

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toolBar ); textArea ); statusBar );

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} private void showStatus( String text ) { statusBar.showStatus( text ); } // INNER CLASSES // Inner class for status bar private class StatusBar extends JPanel { private JLabel label = new JLabel( " ", JLabel.LEFT ); public StatusBar() { setLayout( new BorderLayout() ); setBackground( Color.lightGray ); label.setForeground( Color.black ); add( label, BorderLayout.SOUTH ); }

}

public void showStatus( String text ) { label.setText( " " + text ); doLayout(); } // end of StatusBar class

// Inner class for toolbar private class ToolBar extends JPanel implements ActionListener { public ToolBar() { JButton btnCut = new JButton("Cut"); btnCut.setActionCommand("cut"); btnCut.setMnemonic('c'); btnCut.setToolTipText("Cut to clipboard"); btnCut.addActionListener( this ); JButton btnCopy = new JButton("Copy"); btnCopy.setActionCommand("copy"); btnCopy.setMnemonic('o'); btnCopy.setToolTipText("Copy to clipboard"); btnCopy.addActionListener( this ); JButton btnPaste = new JButton("Paste"); btnPaste.setActionCommand("paste"); btnPaste.setMnemonic('p'); btnPaste.setToolTipText("Paste from clipboard"); btnPaste.addActionListener( this ); setBackground( Color.lightGray ); setLayout( new FlowLayout( FlowLayout.LEFT )); add( btnCut ); add( btnCopy ); add( btnPaste ); } // Event handling for Cut, Copy and Paste buttons public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("cut") ) cut(); else if( ae.getActionCommand().equals("copy") )

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copy(); else if( ae.getActionCommand().equals("paste") ) paste(); }

} // end of ToolBar class

// Login window private class LoginDialog extends JDialog implements ActionListener { boolean OKflag[]; JLabel labelUID JLabel labelPWD JTextField tfUID JTextField tfPWD JButton btnOK JButton btnCancel

= = = = = =

new new new new new new

JLabel("User ID:", JLabel.RIGHT); JLabel("Password:", JLabel.RIGHT); JTextField(); JTextField(); JButton("OK"); JButton("Cancel");

public LoginDialog( boolean[] OKflagI ) { super( MainWindow.this, "User Login", true ); OKflag = OKflagI; initLayout(); // Set up accelerators & mnemonics // For user ID field, use JTextField.setFocusAccelerator() tfUID.setFocusAccelerator( 'u' ); labelUID.setDisplayedMnemonic( 'u' ); // For password field, use JLabel.setLabelFor() labelPWD.setLabelFor( tfPWD ); labelPWD.setDisplayedMnemonic( 'p' ); // Set up action commands btnOK.setActionCommand("ok"); btnCancel.setActionCommand("cancel"); // Button event handling performed by LoginDialog btnOK.addActionListener( this ); btnCancel.addActionListener( this ); /* // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { we.getWindow().dispose(); } } ); */ // Use default closing mechanism to close dialog setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) );

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show(); } public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("ok") ) OKflag[0] = true; dispose(); } private void initLayout() { GridBagLayout gbl = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); getContentPane().setLayout( gbl ); setBounds( 100, 100, 300, 200 ); // Size & position dialog setResizable( false ); // Make dialog fixed size // Add UID label to login window gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelUID, gbc ); // apply constraints getContentPane().add( labelUID ); // Add PWD label to login window gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelPWD, gbc ); // apply constraints getContentPane().add( labelPWD ); // Add UID text field to login window gbc.gridx = 2; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfUID, gbc ); // apply constraints getContentPane().add( tfUID ); // Add PWD text field to login window gbc.gridx = 2; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1;

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gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfPWD, gbc ); // apply constraints getContentPane().add( tfPWD ); // Add OK button to login window gbc.gridx = 1; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnOK, gbc ); // apply constraints getContentPane().add( btnOK ); // Add Cancel button to login window gbc.gridx = 2; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnCancel, gbc ); // apply constraints getContentPane().add( btnCancel ); tfUID.requestFocus(); } }

// Put focus on ID field

// end of initLayout()

// end of LoginWindow class

}

// end of MainWindow class

// // // // //

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c;

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for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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Workshop 4: Using Menus & ToolBars

SwingApp.java // SwingApp.java // After Menu & ToolBar exercise. import import import import

java.awt.*; java.awt.event.*; javax.swing.*; javax.swing.event.*;

public class SwingApp { public static void main( String[] args ) { new MainWindow(args); } } class MainWindow extends JFrame { private ToolBar toolBar ; private StatusBar statusBar = new StatusBar(); private JTextArea textArea = new JTextArea(); private Action actCut, actCopy, actPaste; // Constructor public MainWindow(String[] args) { super("Studentsoft Super System"); initActions(); initLayout(); initMenu(); // Turn off default closing mechanism setDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE ); // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { quit(0);

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} } ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); // Pop login dialog if "login" passed as 1st argument. // If user cancels or closes, close the application. if( args.length > 0 && args[0].toUpperCase().equals("LOGIN") ) if( ! login() ) quit(0); showStatus( "Hello!" ); } // login() pops the LoginDialog, returns true if // user clicks OK, false if user clicks Cancel // or closes. private boolean login() { // return true; boolean bOK[] = new boolean[1]; bOK[0] = false; new LoginDialog(bOK); return bOK[0]; } // Private methods private void cut() { textArea.cut(); showStatus("Text cut to clipboard"); } private void copy() { textArea.copy(); showStatus("Text copied to clipboard"); } private void paste() { textArea.paste(); showStatus("Text pasted from clipboard"); } private boolean quit(int retCode) { System.exit(retCode); return true; } // Set up Action objects private void initActions() { // Action objects for cut, copy, paste: actCut = new AbstractAction("Cut") { public void actionPerformed(ActionEvent ae) { cut(); } }; actCut.putValue(Action.SHORT_DESCRIPTION,

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"Cut text to clipboard"); actCopy = new AbstractAction("Copy") { public void actionPerformed(ActionEvent ae) { copy(); } }; actCopy.putValue(Action.SHORT_DESCRIPTION, "Copy text to clipboard"); actPaste = new AbstractAction("Paste") { public void actionPerformed(ActionEvent ae) { paste(); } }; actPaste.putValue(Action.SHORT_DESCRIPTION, "Paste text from clipboard"); } private void initLayout() { toolBar = new ToolBar(); // Configure text area textArea.setLineWrap( true ); textArea.setWrapStyleWord( true ); textArea.setToolTipText("Enter / edit text here"); // Configure frame setBounds( 100, 100, 500, 300 ); getContentPane().add( BorderLayout.NORTH , getContentPane().add( BorderLayout.CENTER, getContentPane().add( BorderLayout.SOUTH ,

toolBar ); textArea ); statusBar );

// Create caret listener for textArea to react when // selection changes textArea.addCaretListener( new CaretListener() { public void caretUpdate(CaretEvent e) { boolean isSelection = textArea.getSelectionStart() != textArea.getSelectionEnd(); actCut.setEnabled(isSelection); actCopy.setEnabled(isSelection); } }); } private void initMenu() { // Local inner class for handling menu items class MenuHandler implements ActionListener { public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("FileNew") ) showStatus("New file created"); else if( ae.getActionCommand().equals("FileOpen") ) showStatus("File opened"); else if( ae.getActionCommand().equals("FileSave") ) showStatus("File saved"); else if( ae.getActionCommand().equals("FileExit") )

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quit( 0 ); // Toggle toolbar visibility else if( ae.getActionCommand().equals("OptionsToolbar") ) { // Get source, cast it as JCheckBoxMenuItem: JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem) ae.getSource(); toolBar.setVisible( cbmi.isSelected() ); getContentPane().doLayout(); } } } // Instantiate handler MenuHandler mh = new MenuHandler(); // Create menu bar JMenuBar mb = new JMenuBar(); // Assemble File menu: JMenu mFile = new JMenu("File"); mFile.setMnemonic('f'); // File | New JMenuItem miFNew = new JMenuItem("New", 'n'); miFNew.addActionListener( mh ); miFNew.setActionCommand("FileNew"); miFNew.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_N, Event.CTRL_MASK, true )); mFile.add(miFNew); // File | Open JMenuItem miFOpen = new JMenuItem("Open", 'o'); miFOpen.addActionListener( mh ); miFOpen.setActionCommand("FileOpen"); miFOpen.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK, true )); mFile.add(miFOpen); // File | Save JMenuItem miFSave = new JMenuItem("Save", 's'); miFSave.addActionListener( mh ); miFSave.setActionCommand("FileSave"); miFSave.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_S, Event.CTRL_MASK, true )); mFile.add(miFSave); // Separator mFile.addSeparator(); // File | Exit JMenuItem miFExit = new JMenuItem("Exit", 'x'); miFExit.addActionListener( mh ); miFExit.setActionCommand("FileExit"); mFile.add(miFExit); // Attach File menu to menu bar mb.add(mFile);

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// Create Edit menu from Action objects JMenu mEdit = new JMenu("Edit"); mEdit.setMnemonic('e'); Action actions[] = { actCut, actCopy, actPaste }; int mnemonics[] = { 'c', 'o', 'p' }; for( int i = 0; i < actions.length; i++ ) { JMenuItem mi = mEdit.add(actions[i]); mi.setMnemonic( mnemonics[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); mi.setToolTipText( s ); } mb.add(mEdit); // Create Options menu JMenu mOptions = new JMenu("Options"); mOptions.setMnemonic('o'); // Options | Toolbar JMenuItem miOToolbar = new JCheckBoxMenuItem("Toolbar", true); miOToolbar.setMnemonic('t'); miOToolbar.addActionListener( mh ); miOToolbar.setActionCommand("OptionsToolbar"); mOptions.add(miOToolbar); mb.add(mOptions); // Attach menubar to frame. getRootPane().setJMenuBar(mb); } private void showStatus( String text ) { statusBar.showStatus( text ); } // INNER CLASSES // Inner class for status bar private class StatusBar extends JPanel { private JLabel label = new JLabel( " ", JLabel.LEFT ); public StatusBar() { setLayout( new BorderLayout() ); setBackground( Color.lightGray ); label.setForeground( Color.black ); add( label, BorderLayout.SOUTH ); }

}

public void showStatus( String text ) { label.setText( " " + text ); doLayout(); } // end of StatusBar class

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//

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// Inner class for toolbar private class ToolBar extends JPanel private class ToolBar extends JToolBar implements ActionListener {

public ToolBar() { // Add actions to the toolbar to create buttons. Action actions[] = { actCut, actCopy, actPaste }; for( int i = 0; i < actions.length; i++ ) { JButton btn = add(actions[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); btn.setToolTipText( s ); } /* JButton btnCut = new JButton("Cut"); btnCut.setActionCommand("cut"); btnCut.setMnemonic('c'); btnCut.setToolTipText("Cut to clipboard"); btnCut.addActionListener( this ); JButton btnCopy = new JButton("Copy"); btnCopy.setActionCommand("copy"); btnCopy.setMnemonic('o'); btnCopy.setToolTipText("Copy to clipboard"); btnCopy.addActionListener( this ); JButton btnPaste = new JButton("Paste"); btnPaste.setActionCommand("paste"); btnPaste.setMnemonic('p'); btnPaste.setToolTipText("Paste from clipboard"); btnPaste.addActionListener( this ); setBackground( Color.lightGray ); setLayout( new FlowLayout( FlowLayout.LEFT )); add( btnCut ); add( btnCopy ); add( btnPaste ); */ }

}

// Event handling for Cut, Copy and Paste buttons public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("cut") ) cut(); else if( ae.getActionCommand().equals("copy") ) copy(); else if( ae.getActionCommand().equals("paste") ) paste(); } // end of ToolBar class

// Login window private class LoginDialog extends JDialog implements ActionListener {

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boolean OKflag[]; JLabel labelUID JLabel labelPWD JTextField tfUID JTextField tfPWD JButton btnOK JButton btnCancel

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JLabel("User ID:", JLabel.RIGHT); JLabel("Password:", JLabel.RIGHT); JTextField(); JTextField(); JButton("OK"); JButton("Cancel");

public LoginDialog( boolean[] OKflagI ) { super( MainWindow.this, "User Login", true ); OKflag = OKflagI; initLayout(); // Set up accelerators & mnemonics // For user ID field, use JTextField.setFocusAccelerator() tfUID.setFocusAccelerator( 'u' ); labelUID.setDisplayedMnemonic( 'u' ); // For password field, use JLabel.setLabelFor() labelPWD.setLabelFor( tfPWD ); labelPWD.setDisplayedMnemonic( 'p' ); // Set up action commands btnOK.setActionCommand("ok"); btnCancel.setActionCommand("cancel"); // Button event handling performed by LoginDialog btnOK.addActionListener( this ); btnCancel.addActionListener( this ); /* // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { we.getWindow().dispose(); } } ); */ // Use default closing mechanism to close dialog setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); } public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("ok") ) OKflag[0] = true; dispose(); } private void initLayout() {

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GridBagLayout gbl = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); getContentPane().setLayout( gbl ); setBounds( 100, 100, 300, 200 ); // Size & position dialog setResizable( false ); // Make dialog fixed size // Add UID label to login window gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelUID, gbc ); // apply constraints getContentPane().add( labelUID ); // Add PWD label to login window gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelPWD, gbc ); // apply constraints getContentPane().add( labelPWD ); // Add UID text field to login window gbc.gridx = 2; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfUID, gbc ); // apply constraints getContentPane().add( tfUID ); // Add PWD text field to login window gbc.gridx = 2; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfPWD, gbc ); // apply constraints getContentPane().add( tfPWD ); // Add OK button to login window gbc.gridx = 1; gbc.gridy = 2;

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gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnOK, gbc ); // apply constraints getContentPane().add( btnOK ); // Add Cancel button to login window gbc.gridx = 2; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnCancel, gbc ); // apply constraints getContentPane().add( btnCancel ); tfUID.requestFocus(); } }

// Put focus on ID field

// end of initLayout()

// end of LoginWindow class

}

// end of MainWindow class

// // // // //

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c; for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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Workshop 5: Using Common Dialogs

SwingApp.java // SwingApp.java // After Dialogs exercise. import import import import import

java.awt.*; java.awt.event.*; javax.swing.*; javax.swing.event.*; javax.swing.text.JTextComponent;

public class SwingApp { public static void main( String[] args ) { new MainWindow(args); } } class MainWindow extends JFrame { private ToolBar toolBar ; private StatusBar statusBar = new StatusBar(); private JTextArea textArea = new JTextArea(); private Action actCut, actCopy, actPaste; // Constructor public MainWindow(String[] args) { super("Studentsoft Super System"); initActions(); initLayout(); initMenu(); // Turn off default closing mechanism setDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE ); // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) {

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quit(0); } } ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); // Pop login dialog if "login" passed as 1st argument. // If user cancels or closes, close the application. if( args.length > 0 && args[0].toUpperCase().equals("LOGIN") ) if( ! login() ) quit(0); showStatus( "Hello!" ); } // login() pops the LoginDialog, returns true if // user clicks OK, false if user clicks Cancel // or closes. private boolean login() { // return true; boolean bOK[] = new boolean[1]; bOK[0] = false; new LoginDialog(bOK); return bOK[0]; } // Private methods private void cut() { textArea.cut(); showStatus("Text cut to clipboard"); } private void copy() { textArea.copy(); showStatus("Text copied to clipboard"); } private void paste() { textArea.paste(); showStatus("Text pasted from clipboard"); } private boolean quit(int retCode) { int intAnsw = JOptionPane.showConfirmDialog( this, "Are you sure you want to exit?", "Exiting Application", JOptionPane.YES_NO_OPTION ); if( intAnsw == JOptionPane.YES_OPTION ) { System.exit(retCode); return true; } else return false; }

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private boolean openFile() { JFileChooser fc = new JFileChooser(); int intAnsw = fc.showOpenDialog(this); // If user clicked cancel, return false if( intAnsw == JFileChooser.CANCEL_OPTION ) return false; showStatus( "Opened file: " + fc.getSelectedFile() ); return true; } private boolean chooseFont( JTextComponent tc ) { // Compose array of font names. String fonts[] = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamily Names(); Font curFont = tc.getFont(); // Get current setting Object oChoice = JOptionPane.showInputDialog( this, "Choose a font:", "Choose Font", JOptionPane.QUESTION_MESSAGE, null, fonts, curFont.getName() ); if( oChoice == null ) return false; tc.setFont( new Font( (String) oChoice, curFont.getStyle(), curFont.getSize() )); tc.repaint(); return true; } // Set up Action objects private void initActions() { // Action objects for cut, copy, paste: actCut = new AbstractAction("Cut") { public void actionPerformed(ActionEvent ae) { cut(); } }; actCut.putValue(Action.SHORT_DESCRIPTION, "Cut text to clipboard"); actCopy = new AbstractAction("Copy") { public void actionPerformed(ActionEvent ae) { copy(); } }; actCopy.putValue(Action.SHORT_DESCRIPTION, "Copy text to clipboard"); actPaste = new AbstractAction("Paste") { public void actionPerformed(ActionEvent ae) { paste(); } }; actPaste.putValue(Action.SHORT_DESCRIPTION,

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"Paste text from clipboard"); } private void initLayout() { toolBar = new ToolBar(); // Configure text area textArea.setLineWrap( true ); textArea.setWrapStyleWord( true ); textArea.setToolTipText("Enter / edit text here"); // Configure frame setBounds( 100, 100, 500, 300 ); getContentPane().add( BorderLayout.NORTH , getContentPane().add( BorderLayout.CENTER, getContentPane().add( BorderLayout.SOUTH ,

toolBar ); textArea ); statusBar );

// Create caret listener for textArea to react when // selection changes textArea.addCaretListener( new CaretListener() { public void caretUpdate(CaretEvent e) { boolean isSelection = textArea.getSelectionStart() != textArea.getSelectionEnd(); actCut.setEnabled(isSelection); actCopy.setEnabled(isSelection); } }); } private void initMenu() { // Local inner class for handling menu items class MenuHandler implements ActionListener { public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("FileNew") ) showStatus("New file created"); else if( ae.getActionCommand().equals("FileOpen") ) // showStatus("File opened"); openFile(); else if( ae.getActionCommand().equals("FileSave") ) showStatus("File saved"); else if( ae.getActionCommand().equals("FileExit") ) quit( 0 ); // Toggle toolbar visibility else if( ae.getActionCommand().equals("OptionsToolbar") ) { // Get source, cast it as JCheckBoxMenuItem: JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem) ae.getSource(); toolBar.setVisible( cbmi.isSelected() ); getContentPane().doLayout(); } // Set font on text area else if( ae.getActionCommand().equals("OptionsFont") ) chooseFont(textArea);

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} } // Instantiate handler MenuHandler mh = new MenuHandler(); // Create menu bar JMenuBar mb = new JMenuBar(); // Assemble File menu: JMenu mFile = new JMenu("File"); mFile.setMnemonic('f'); // File | New JMenuItem miFNew = new JMenuItem("New", 'n'); miFNew.addActionListener( mh ); miFNew.setActionCommand("FileNew"); miFNew.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_N, Event.CTRL_MASK, true )); mFile.add(miFNew); // File | Open JMenuItem miFOpen = new JMenuItem("Open", 'o'); miFOpen.addActionListener( mh ); miFOpen.setActionCommand("FileOpen"); miFOpen.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK, true )); mFile.add(miFOpen); // File | Save JMenuItem miFSave = new JMenuItem("Save", 's'); miFSave.addActionListener( mh ); miFSave.setActionCommand("FileSave"); miFSave.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_S, Event.CTRL_MASK, true )); mFile.add(miFSave); // Separator mFile.addSeparator(); // File | Exit JMenuItem miFExit = new JMenuItem("Exit", 'x'); miFExit.addActionListener( mh ); miFExit.setActionCommand("FileExit"); mFile.add(miFExit); // Attach File menu to menu bar mb.add(mFile); // Create Edit menu from Action objects JMenu mEdit = new JMenu("Edit"); mEdit.setMnemonic('e'); Action actions[] = { actCut, actCopy, actPaste }; int mnemonics[] = { 'c', 'o', 'p' }; for( int i = 0; i < actions.length; i++ ) { JMenuItem mi = mEdit.add(actions[i]);

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mi.setMnemonic( mnemonics[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); mi.setToolTipText( s ); } mb.add(mEdit); // Create Options menu JMenu mOptions = new JMenu("Options"); mOptions.setMnemonic('o'); // Options | Toolbar JMenuItem miOToolbar = new JCheckBoxMenuItem("Toolbar", true); miOToolbar.setMnemonic('t'); miOToolbar.addActionListener( mh ); miOToolbar.setActionCommand("OptionsToolbar"); mOptions.add(miOToolbar); // Add separator & Font item to Options menu mOptions.addSeparator(); JMenuItem miOFont = new JMenuItem("Text Font...", 'f'); miOFont.addActionListener( mh ); miOFont.setActionCommand("OptionsFont"); mOptions.add(miOFont); mb.add(mOptions); // Attach menubar to frame. getRootPane().setJMenuBar(mb); } private void showStatus( String text ) { statusBar.showStatus( text ); } // INNER CLASSES // Inner class for status bar private class StatusBar extends JPanel { private JLabel label_ = new JLabel( " ", JLabel.LEFT ); public StatusBar() { setLayout( new BorderLayout() ); setBackground( Color.lightGray ); label_.setForeground( Color.black ); add( label_, BorderLayout.SOUTH ); }

} //

public void showStatus( String text ) { label_.setText( " " + text ); doLayout(); } // end of StatusBar class

// Inner class for toolbar private class ToolBar extends JPanel

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private class ToolBar extends JToolBar implements ActionListener { public ToolBar() { // Add actions to the toolbar to create buttons. Action actions[] = { actCut, actCopy, actPaste }; for( int i = 0; i < actions.length; i++ ) { JButton btn = add(actions[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); btn.setToolTipText( s ); } /* JButton btnCut = new JButton("Cut"); btnCut.setActionCommand("cut"); btnCut.setMnemonic('c'); btnCut.setToolTipText("Cut to clipboard"); btnCut.addActionListener( this ); JButton btnCopy = new JButton("Copy"); btnCopy.setActionCommand("copy"); btnCopy.setMnemonic('o'); btnCopy.setToolTipText("Copy to clipboard"); btnCopy.addActionListener( this ); JButton btnPaste = new JButton("Paste"); btnPaste.setActionCommand("paste"); btnPaste.setMnemonic('p'); btnPaste.setToolTipText("Paste from clipboard"); btnPaste.addActionListener( this ); setBackground( Color.lightGray ); setLayout( new FlowLayout( FlowLayout.LEFT )); add( btnCut ); add( btnCopy ); add( btnPaste ); */ }

}

// Event handling for Cut, Copy and Paste buttons public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("cut") ) cut(); else if( ae.getActionCommand().equals("copy") ) copy(); else if( ae.getActionCommand().equals("paste") ) paste(); } // end of ToolBar class

// Login window private class LoginDialog extends JDialog implements ActionListener { boolean OKflag[];

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JLabel labelUID JLabel labelPWD JTextField tfUID JTextField tfPWD JButton btnOK JButton btnCancel

= = = = = =

new new new new new new

Page xxx

JLabel("User ID:", JLabel.RIGHT); JLabel("Password:", JLabel.RIGHT); JTextField(); JTextField(); JButton("OK"); JButton("Cancel");

public LoginDialog( boolean[] OKflagI ) { super( MainWindow.this, "User Login", true ); OKflag = OKflagI; initLayout(); // Set up accelerators & mnemonics // For user ID field, use JTextField.setFocusAccelerator() tfUID.setFocusAccelerator( 'u' ); labelUID.setDisplayedMnemonic( 'u' ); // For password field, use JLabel.setLabelFor() labelPWD.setLabelFor( tfPWD ); labelPWD.setDisplayedMnemonic( 'p' ); // Set up action commands btnOK.setActionCommand("ok"); btnCancel.setActionCommand("cancel"); // Button event handling performed by LoginDialog btnOK.addActionListener( this ); btnCancel.addActionListener( this ); /* // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { we.getWindow().dispose(); } } ); */ // Use default closing mechanism to close dialog setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); } public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("ok") ) { // Check if User ID is correct if( ! tfUID.getText().trim().toUpperCase().equals("STUDENT") ) { JOptionPane.showMessageDialog( null, "Sorry, invalid user ID.\nTry again.", "Invalid Login", JOptionPane.WARNING_MESSAGE ); tfUID.requestFocus();

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tfUID.selectAll(); return; } // Check if password is correct if( ! tfPWD.getText().trim().toUpperCase().equals("LEARN") ) { JOptionPane.showMessageDialog( null, "Sorry, invalid password.\nTry again.", "Invalid Login", JOptionPane.WARNING_MESSAGE ); tfPWD.requestFocus(); tfPWD.selectAll(); return; } OKflag[0] = true; } dispose(); } private void initLayout() { GridBagLayout gbl = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); getContentPane().setLayout( gbl ); setBounds( 100, 100, 300, 200 ); // Size & position dialog setResizable( false ); // Make dialog fixed size // Add UID label to login window gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelUID, gbc ); // apply constraints getContentPane().add( labelUID ); // Add PWD label to login window gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelPWD, gbc ); // apply constraints getContentPane().add( labelPWD ); // Add UID text field to login window gbc.gridx = 2; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1;

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gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfUID, gbc ); // apply constraints getContentPane().add( tfUID ); // Add PWD text field to login window gbc.gridx = 2; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfPWD, gbc ); // apply constraints getContentPane().add( tfPWD ); // Add OK button to login window gbc.gridx = 1; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnOK, gbc ); // apply constraints getContentPane().add( btnOK ); // Add Cancel button to login window gbc.gridx = 2; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnCancel, gbc ); // apply constraints getContentPane().add( btnCancel ); tfUID.requestFocus(); } }

// Put focus on ID field

// end of initLayout()

// end of LoginWindow class

}

// end of MainWindow class

// // // // //

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

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class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c; for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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Workshop 6: Using Borders

SwingApp.java // SwingApp.java // After Borders exercise. import import import import import import

java.awt.*; java.awt.event.*; javax.swing.*; javax.swing.border.*; javax.swing.event.*; javax.swing.text.JTextComponent;

public class SwingApp { public static void main( String[] args ) { new MainWindow(args); } } class MainWindow extends JFrame { private ToolBar toolBar ; private StatusBar statusBar = new StatusBar(); private JTextArea textArea = new JTextArea(); private Action actCut, actCopy, actPaste; // Constructor public MainWindow(String[] args) { super("Studentsoft Super System"); initActions(); initLayout(); initMenu(); // Turn off default closing mechanism setDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE ); // A simple anonymous adapter to handle // windowClosing event.

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addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { quit(0); } } ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); // Pop login dialog if "login" passed as 1st argument. // If user cancels or closes, close the application. if( args.length > 0 && args[0].toUpperCase().equals("LOGIN") ) if( ! login() ) quit(0); showStatus( "Hello!" ); } // login() pops the LoginDialog, returns true if // user clicks OK, false if user clicks Cancel // or closes. private boolean login() { // return true; boolean bOK[] = new boolean[1]; bOK[0] = false; new LoginDialog(bOK); return bOK[0]; } // Private methods private void cut() { textArea.cut(); showStatus("Text cut to clipboard"); } private void copy() { textArea.copy(); showStatus("Text copied to clipboard"); } private void paste() { textArea.paste(); showStatus("Text pasted from clipboard"); } private boolean quit(int retCode) { int intAnsw = JOptionPane.showConfirmDialog( this, "Are you sure you want to exit?", "Exiting Application", JOptionPane.YES_NO_OPTION ); if( intAnsw == JOptionPane.YES_OPTION ) { System.exit(retCode); return true; } else return false; }

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private boolean openFile() { JFileChooser fc = new JFileChooser(); int intAnsw = fc.showOpenDialog(this); // If user clicked cancel, return false if( intAnsw == JFileChooser.CANCEL_OPTION ) return false; showStatus( "Opened file: " + fc.getSelectedFile() ); return true; } private boolean chooseFont( JTextComponent tc ) { // Compose array of font names. String fonts[] = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamily Names(); Font curFont = tc.getFont(); // Get current setting Object oChoice = JOptionPane.showInputDialog( this, "Choose a font:", "Choose Font", JOptionPane.QUESTION_MESSAGE, null, fonts, curFont.getName() ); if( oChoice == null ) return false; tc.setFont( new Font( (String) oChoice, curFont.getStyle(), curFont.getSize() )); tc.repaint(); return true; } // Set up Action objects private void initActions() { // Action objects for cut, copy, paste: actCut = new AbstractAction("Cut") { public void actionPerformed(ActionEvent ae) { cut(); } }; actCut.putValue(Action.SHORT_DESCRIPTION, "Cut text to clipboard"); actCopy = new AbstractAction("Copy") { public void actionPerformed(ActionEvent ae) { copy(); } }; actCopy.putValue(Action.SHORT_DESCRIPTION, "Copy text to clipboard"); actPaste = new AbstractAction("Paste") { public void actionPerformed(ActionEvent ae) { paste(); }

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}; actPaste.putValue(Action.SHORT_DESCRIPTION, "Paste text from clipboard"); } private void initLayout() { toolBar = new ToolBar(); // Configure text area textArea.setLineWrap( true ); textArea.setWrapStyleWord( true ); textArea.setToolTipText("Enter / edit text here"); textArea.setBorder( BorderFactory.createTitledBorder( "Workspace" )); // Configure frame setBounds( 100, 100, 500, 300 ); getContentPane().add( BorderLayout.NORTH , getContentPane().add( BorderLayout.CENTER, getContentPane().add( BorderLayout.SOUTH ,

toolBar ); textArea ); statusBar );

// Create caret listener for textArea to react when // selection changes textArea.addCaretListener( new CaretListener() { public void caretUpdate(CaretEvent e) { boolean isSelection = textArea.getSelectionStart() != textArea.getSelectionEnd(); actCut.setEnabled(isSelection); actCopy.setEnabled(isSelection); } }); } private void initMenu() { // Local inner class for handling menu items class MenuHandler implements ActionListener { public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("FileNew") ) showStatus("New file created"); else if( ae.getActionCommand().equals("FileOpen") ) // showStatus("File opened"); openFile(); else if( ae.getActionCommand().equals("FileSave") ) showStatus("File saved"); else if( ae.getActionCommand().equals("FileExit") ) quit( 0 ); // Toggle toolbar visibility else if( ae.getActionCommand().equals("OptionsToolbar") ) { // Get source, cast it as JCheckBoxMenuItem: JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem) ae.getSource(); toolBar.setVisible( cbmi.isSelected() ); getContentPane().doLayout(); }

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// Set font on text area else if( ae.getActionCommand().equals("OptionsFont") ) chooseFont(textArea); } } // Instantiate handler MenuHandler mh = new MenuHandler(); // Create menu bar JMenuBar mb = new JMenuBar(); // Assemble File menu: JMenu mFile = new JMenu("File"); mFile.setMnemonic('f'); // File | New JMenuItem miFNew = new JMenuItem("New", 'n'); miFNew.addActionListener( mh ); miFNew.setActionCommand("FileNew"); miFNew.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_N, Event.CTRL_MASK, true )); mFile.add(miFNew); // File | Open JMenuItem miFOpen = new JMenuItem("Open", 'o'); miFOpen.addActionListener( mh ); miFOpen.setActionCommand("FileOpen"); miFOpen.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK, true )); mFile.add(miFOpen); // File | Save JMenuItem miFSave = new JMenuItem("Save", 's'); miFSave.addActionListener( mh ); miFSave.setActionCommand("FileSave"); miFSave.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_S, Event.CTRL_MASK, true )); mFile.add(miFSave); // Separator mFile.addSeparator(); // File | Exit JMenuItem miFExit = new JMenuItem("Exit", 'x'); miFExit.addActionListener( mh ); miFExit.setActionCommand("FileExit"); mFile.add(miFExit); // Attach File menu to menu bar mb.add(mFile); // Create Edit menu from Action objects JMenu mEdit = new JMenu("Edit"); mEdit.setMnemonic('e');

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Action actions[] = { actCut, actCopy, actPaste }; int mnemonics[] = { 'c', 'o', 'p' }; for( int i = 0; i < actions.length; i++ ) { JMenuItem mi = mEdit.add(actions[i]); mi.setMnemonic( mnemonics[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); mi.setToolTipText( s ); } mb.add(mEdit); // Create Options menu JMenu mOptions = new JMenu("Options"); mOptions.setMnemonic('o'); // Options | Toolbar JMenuItem miOToolbar = new JCheckBoxMenuItem("Toolbar", true); miOToolbar.setMnemonic('t'); miOToolbar.addActionListener( mh ); miOToolbar.setActionCommand("OptionsToolbar"); mOptions.add(miOToolbar); // Add separator & Font item to Options menu mOptions.addSeparator(); JMenuItem miOFont = new JMenuItem("Text Font...", 'f'); miOFont.addActionListener( mh ); miOFont.setActionCommand("OptionsFont"); mOptions.add(miOFont); mb.add(mOptions); // Attach menubar to frame. getRootPane().setJMenuBar(mb); } private void showStatus( String text ) { statusBar.showStatus( text ); } // INNER CLASSES // Inner class for status bar private class StatusBar extends JPanel { private JLabel label = new JLabel( "", JLabel.LEFT ); public StatusBar() { setLayout( new BorderLayout() ); setBackground( Color.lightGray ); label.setForeground( Color.black ); label.setBorder( BorderFactory.createLoweredBevelBorder()); add( label, BorderLayout.SOUTH ); } public void showStatus( String text ) { label.setText( " " + text ); doLayout();

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} //

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} // end of StatusBar class

// Inner class for toolbar private class ToolBar extends JPanel private class ToolBar extends JToolBar implements ActionListener {

public ToolBar() { // Add actions to the toolbar to create buttons. Action actions[] = { actCut, actCopy, actPaste }; for( int i = 0; i < actions.length; i++ ) { JButton btn = add(actions[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); btn.setToolTipText( s ); } /* JButton btnCut = new JButton("Cut"); btnCut.setActionCommand("cut"); btnCut.setMnemonic('c'); btnCut.setToolTipText("Cut to clipboard"); btnCut.addActionListener( this ); JButton btnCopy = new JButton("Copy"); btnCopy.setActionCommand("copy"); btnCopy.setMnemonic('o'); btnCopy.setToolTipText("Copy to clipboard"); btnCopy.addActionListener( this ); JButton btnPaste = new JButton("Paste"); btnPaste.setActionCommand("paste"); btnPaste.setMnemonic('p'); btnPaste.setToolTipText("Paste from clipboard"); btnPaste.addActionListener( this ); setBackground( Color.lightGray ); setLayout( new FlowLayout( FlowLayout.LEFT )); add( btnCut ); add( btnCopy ); add( btnPaste ); */ }

}

// Event handling for Cut, Copy and Paste buttons public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("cut") ) cut(); else if( ae.getActionCommand().equals("copy") ) copy(); else if( ae.getActionCommand().equals("paste") ) paste(); } // end of ToolBar class

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// Login window private class LoginDialog extends JDialog implements ActionListener { boolean OKflag[]; JLabel labelUID JLabel labelPWD JTextField tfUID JTextField tfPWD JButton btnOK JButton btnCancel

= = = = = =

new new new new new new

JLabel("User ID:", JLabel.RIGHT); JLabel("Password:", JLabel.RIGHT); JTextField(); JTextField(); JButton("OK"); JButton("Cancel");

public LoginDialog( boolean[] OKflagI ) { super( MainWindow.this, "User Login", true ); OKflag = OKflagI; initLayout(); // Set up accelerators & mnemonics // For user ID field, use JTextField.setFocusAccelerator() tfUID.setFocusAccelerator( 'u' ); labelUID.setDisplayedMnemonic( 'u' ); // For password field, use JLabel.setLabelFor() labelPWD.setLabelFor( tfPWD ); labelPWD.setDisplayedMnemonic( 'p' ); // Set up action commands btnOK.setActionCommand("ok"); btnCancel.setActionCommand("cancel"); // Button event handling performed by LoginDialog btnOK.addActionListener( this ); btnCancel.addActionListener( this ); /* // A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { we.getWindow().dispose(); } } ); */ // Use default closing mechanism to close dialog setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); } public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("ok") ) { // Check if User ID is correct

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if( ! tfUID.getText().trim().toUpperCase().equals("STUDENT") ) { JOptionPane.showMessageDialog( null, "Sorry, invalid user ID.\nTry again.", "Invalid Login", JOptionPane.WARNING_MESSAGE ); tfUID.requestFocus(); tfUID.selectAll(); return; } // Check if password is correct if( ! tfPWD.getText().trim().toUpperCase().equals("LEARN") ) { JOptionPane.showMessageDialog( null, "Sorry, invalid password.\nTry again.", "Invalid Login", JOptionPane.WARNING_MESSAGE ); tfPWD.requestFocus(); tfPWD.selectAll(); return; } OKflag[0] = true; } dispose(); } private void initLayout() { GridBagLayout gbl = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); getContentPane().setLayout( gbl ); setBounds( 100, 100, 300, 200 ); // Size & position dialog setResizable( false ); // Make dialog fixed size // Add UID label to login window gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelUID, gbc ); // apply constraints getContentPane().add( labelUID ); // Add PWD label to login window gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelPWD, gbc ); // apply constraints getContentPane().add( labelPWD );

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// Add UID text field to login window gbc.gridx = 2; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfUID, gbc ); // apply constraints getContentPane().add( tfUID ); // Add PWD text field to login window gbc.gridx = 2; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfPWD, gbc ); // apply constraints getContentPane().add( tfPWD ); // Add OK button to login window gbc.gridx = 1; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnOK, gbc ); // apply constraints getContentPane().add( btnOK ); // Add Cancel button to login window gbc.gridx = 2; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnCancel, gbc ); // apply constraints getContentPane().add( btnCancel ); tfUID.requestFocus(); } } }

// Put focus on ID field

// end of initLayout()

// end of LoginWindow class

// end of MainWindow class

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// // // // //

Page xliv

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c; for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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Workshop 7: Using Internal Frames

SwingApp.java // SwingApp.java // After Internal Frames exercise. import import import import import import

java.awt.*; java.awt.event.*; javax.swing.*; javax.swing.border.*; javax.swing.event.*; javax.swing.text.JTextComponent;

public class SwingApp { public static void main( String[] args ) { new MainWindow(args); } } class MainWindow extends JFrame { private ToolBar toolBar_ ; private StatusBar statusBar_ = new StatusBar(); private JTextArea textArea_; // = new JTextArea(); private Action actCut_, actCopy_, actPaste_; private JDesktopPane desktop_ = new JDesktopPane(); private int intNewFileCounter; // Constructor public MainWindow(String[] args) { super("Studentsoft Super System"); initActions(); initLayout(); initMenu(); // Turn off default closing mechanism setDefaultCloseOperation( JDialog.DO_NOTHING_ON_CLOSE );

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// A simple anonymous adapter to handle // windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { quit(0); } } ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); // Pop login dialog if "login" passed as 1st argument. // If user cancels or closes, close the application. if( args.length > 0 && args[0].toUpperCase().equals("LOGIN") ) if( ! login() ) quit(0); showStatus( "Hello!" ); } // login() pops the LoginDialog, returns true if // user clicks OK, false if user clicks Cancel // or closes. private boolean login() { // return true; boolean bOK[] = new boolean[1]; bOK[0] = false; new LoginDialog(bOK); return bOK[0]; } // Private methods private void cut() { textArea_.cut(); showStatus("Text cut to clipboard"); } private void copy() { textArea_.copy(); showStatus("Text copied to clipboard"); } private void paste() { textArea_.paste(); showStatus("Text pasted from clipboard"); } private boolean quit(int retCode) { int intAnsw = JOptionPane.showConfirmDialog( this, "Are you sure you want to exit?", "Exiting Application", JOptionPane.YES_NO_OPTION ); if( intAnsw == JOptionPane.YES_OPTION ) { System.exit(retCode); return true; } else

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return false; } private void newChild( String title ) { JInternalFrame pad = new NotepadChild( title ); desktop_.add( pad ); try { pad.setSelected(true); // Make it the active notepad } catch( Exception e ) {} } private void newFile() { newChild( "Untitled " + }

++intNewFileCounter );

private boolean openFile() { JFileChooser fc = new JFileChooser(); int intAnsw = fc.showOpenDialog(this); // If user clicked cancel, return false if( intAnsw == JFileChooser.CANCEL_OPTION ) return false; newChild( fc.getSelectedFile().toString() ); showStatus( "Opened file: " + fc.getSelectedFile() ); return true; } private boolean chooseFont( JTextComponent tc ) { // Compose array of font names. String fonts[] = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamily Names(); Font curFont = tc.getFont(); // Get current setting Object oChoice = JOptionPane.showInputDialog( this, "Choose a font:", "Choose Font", JOptionPane.QUESTION_MESSAGE, null, fonts, curFont.getName() ); if( oChoice == null ) return false; tc.setFont( new Font( (String) oChoice, curFont.getStyle(), curFont.getSize() )); tc.repaint(); return true; } // Set up Action objects private void initActions() { // Action objects for cut, copy, paste: actCut_ = new AbstractAction("Cut") { public void actionPerformed(ActionEvent ae) { cut(); } };

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actCut_.putValue(Action.SHORT_DESCRIPTION, "Cut text to clipboard"); actCopy_ = new AbstractAction("Copy") { public void actionPerformed(ActionEvent ae) { copy(); } }; actCopy_.putValue(Action.SHORT_DESCRIPTION, "Copy text to clipboard"); actPaste_ = new AbstractAction("Paste") { public void actionPerformed(ActionEvent ae) { paste(); } }; actPaste_.putValue(Action.SHORT_DESCRIPTION, "Paste text from clipboard"); } private void initLayout() { toolBar_ = new ToolBar(); /* // Configure text area textArea_.setLineWrap( true ); textArea_.setWrapStyleWord( true ); textArea_.setToolTipText("Enter / edit text here"); textArea_.setBorder( BorderFactory.createTitledBorder( "Workspace" )); */ // Configure frame setBounds( 100, 100, 500, 300 ); getContentPane().add( BorderLayout.NORTH , toolBar_ ); getContentPane().add( BorderLayout.CENTER, textArea_ ); getContentPane().add( BorderLayout.CENTER, desktop_ ); getContentPane().add( BorderLayout.SOUTH , statusBar_ );

//

/* // Create caret listener for textArea_ to react when // selection changes textArea_.addCaretListener( new CaretListener() { public void caretUpdate(CaretEvent e) { boolean isSelection = textArea_.getSelectionStart() != textArea_.getSelectionEnd(); actCut_.setEnabled(isSelection); actCopy_.setEnabled(isSelection); } }); */ } private void initMenu() { // Local inner class for handling menu items class MenuHandler implements ActionListener { public void actionPerformed( ActionEvent ae ) {

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if( ae.getActionCommand().equals("FileNew") ) { newFile(); showStatus("New file created"); } else if( ae.getActionCommand().equals("FileOpen") ) // showStatus("File opened"); openFile(); else if( ae.getActionCommand().equals("FileSave") ) showStatus("File saved"); else if( ae.getActionCommand().equals("FileExit") ) quit( 0 ); // Toggle toolbar visibility else if( ae.getActionCommand().equals("OptionsToolbar") ) { // Get source, cast it as JCheckBoxMenuItem: JCheckBoxMenuItem cbmi = (JCheckBoxMenuItem) ae.getSource(); toolBar_.setVisible( cbmi.isSelected() ); getContentPane().doLayout(); } // Set font on text area else if( ae.getActionCommand().equals("OptionsFont") ) chooseFont(textArea_); } } // Instantiate handler MenuHandler mh = new MenuHandler(); // Create menu bar JMenuBar mb = new JMenuBar(); // Assemble File menu: JMenu mFile = new JMenu("File"); mFile.setMnemonic('f'); // File | New JMenuItem miFNew = new JMenuItem("New", 'n'); miFNew.addActionListener( mh ); miFNew.setActionCommand("FileNew"); miFNew.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_N, Event.CTRL_MASK, true )); mFile.add(miFNew); // File | Open JMenuItem miFOpen = new JMenuItem("Open", 'o'); miFOpen.addActionListener( mh ); miFOpen.setActionCommand("FileOpen"); miFOpen.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK, true )); mFile.add(miFOpen); // File | Save JMenuItem miFSave = new JMenuItem("Save", 's'); miFSave.addActionListener( mh ); miFSave.setActionCommand("FileSave");

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miFSave.setAccelerator( KeyStroke.getKeyStroke(KeyEvent.VK_S, Event.CTRL_MASK, true )); mFile.add(miFSave); // Separator mFile.addSeparator(); // File | Exit JMenuItem miFExit = new JMenuItem("Exit", 'x'); miFExit.addActionListener( mh ); miFExit.setActionCommand("FileExit"); mFile.add(miFExit); // Attach File menu to menu bar mb.add(mFile); // Create Edit menu from Action objects JMenu mEdit = new JMenu("Edit"); mEdit.setMnemonic('e'); Action actions[] = { actCut_, actCopy_, actPaste_ }; int mnemonics[] = { 'c', 'o', 'p' }; for( int i = 0; i < actions.length; i++ ) { JMenuItem mi = mEdit.add(actions[i]); mi.setMnemonic( mnemonics[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); mi.setToolTipText( s ); } mb.add(mEdit); // Create Options menu JMenu mOptions = new JMenu("Options"); mOptions.setMnemonic('o'); // Options | Toolbar JMenuItem miOToolbar = new JCheckBoxMenuItem("Toolbar", true); miOToolbar.setMnemonic('t'); miOToolbar.addActionListener( mh ); miOToolbar.setActionCommand("OptionsToolbar"); mOptions.add(miOToolbar); // Add separator & Font item to Options menu mOptions.addSeparator(); JMenuItem miOFont = new JMenuItem("Text Font...", 'f'); miOFont.addActionListener( mh ); miOFont.setActionCommand("OptionsFont"); mOptions.add(miOFont); mb.add(mOptions); // Attach menubar to frame. getRootPane().setJMenuBar(mb);

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} private void showStatus( String text ) { statusBar_.showStatus( text ); } // INNER CLASSES // Inner class for status bar private class StatusBar extends JPanel { private JLabel label_ = new JLabel( "", JLabel.LEFT ); public StatusBar() { setLayout( new BorderLayout() ); setBackground( Color.lightGray ); label_.setForeground( Color.black ); label_.setBorder( BorderFactory.createLoweredBevelBorder()); add( label_, BorderLayout.SOUTH ); }

} //

public void showStatus( String text ) { label_.setText( " " + text ); doLayout(); } // end of StatusBar class

// Inner class for toolbar private class ToolBar extends JPanel private class ToolBar extends JToolBar implements ActionListener {

public ToolBar() { // Add actions to the toolbar to create buttons. Action actions[] = { actCut_, actCopy_, actPaste_ }; for( int i = 0; i < actions.length; i++ ) { JButton btn = add(actions[i]); String s = actions[i].getValue( Action.SHORT_DESCRIPTION ).toString(); btn.setToolTipText( s ); } /* JButton btnCut = new JButton("Cut"); btnCut.setActionCommand("cut"); btnCut.setMnemonic('c'); btnCut.setToolTipText("Cut to clipboard"); btnCut.addActionListener( this ); JButton btnCopy = new JButton("Copy"); btnCopy.setActionCommand("copy"); btnCopy.setMnemonic('o'); btnCopy.setToolTipText("Copy to clipboard"); btnCopy.addActionListener( this ); JButton btnPaste = new JButton("Paste"); btnPaste.setActionCommand("paste"); btnPaste.setMnemonic('p'); btnPaste.setToolTipText("Paste from clipboard"); btnPaste.addActionListener( this );

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setBackground( Color.lightGray ); setLayout( new FlowLayout( FlowLayout.LEFT )); add( btnCut ); add( btnCopy ); add( btnPaste ); */ }

}

// Event handling for Cut, Copy and Paste buttons public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("cut") ) cut(); else if( ae.getActionCommand().equals("copy") ) copy(); else if( ae.getActionCommand().equals("paste") ) paste(); } // end of ToolBar class

// Login window private class LoginDialog extends JDialog implements ActionListener { boolean OKflag_[]; JLabel labelUID_ JLabel labelPWD_ JTextField tfUID_ JTextField tfPWD_ JButton btnOK_ JButton btnCancel_

= = = = = =

new new new new new new

JLabel("User ID:", JLabel.RIGHT); JLabel("Password:", JLabel.RIGHT); JTextField(); JTextField(); JButton("OK"); JButton("Cancel");

public LoginDialog( boolean[] OKflag ) { super( MainWindow.this, "User Login", true ); OKflag_ = OKflag; initLayout(); // Set up accelerators & mnemonics // For user ID field, use JTextField.setFocusAccelerator() tfUID_.setFocusAccelerator( 'u' ); labelUID_.setDisplayedMnemonic( 'u' ); // For password field, use JLabel.setLabelFor() labelPWD_.setLabelFor( tfPWD_ ); labelPWD_.setDisplayedMnemonic( 'p' ); // Set up action commands btnOK_.setActionCommand("ok"); btnCancel_.setActionCommand("cancel"); // Button event handling performed by LoginDialog btnOK_.addActionListener( this ); btnCancel_.addActionListener( this ); /* // A simple anonymous adapter to handle

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// windowClosing event. addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent we ) { we.getWindow().dispose(); } } ); */ // Use default closing mechanism to close dialog setDefaultCloseOperation( JDialog.DISPOSE_ON_CLOSE ); // Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); show(); } public void actionPerformed( ActionEvent ae ) { if( ae.getActionCommand().equals("ok") ) { // Check if User ID is correct if( ! tfUID_.getText().trim().toUpperCase().equals("ALICE") ) { JOptionPane.showMessageDialog( null, "Sorry, invalid user ID.\nTry again.", "Invalid Login", JOptionPane.WARNING_MESSAGE ); tfUID_.requestFocus(); tfUID_.selectAll(); return; } // Check if password is correct if( ! tfPWD_.getText().trim().toUpperCase().equals("DRINK ME") ) { JOptionPane.showMessageDialog( null, "Sorry, invalid password.\nTry again.", "Invalid Login", JOptionPane.WARNING_MESSAGE ); tfPWD_.requestFocus(); tfPWD_.selectAll(); return; } OKflag_[0] = true; } dispose(); } private void initLayout() { GridBagLayout gbl = new GridBagLayout(); GridBagConstraints gbc = new GridBagConstraints(); getContentPane().setLayout( gbl ); setBounds( 100, 100, 300, 200 ); // Size & position dialog setResizable( false ); // Make dialog fixed size // Add UID label gbc.gridx = gbc.gridy = gbc.gridwidth =

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gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelUID_, gbc ); // apply constraints getContentPane().add( labelUID_ ); // Add PWD label to login window gbc.gridx = 0; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.EAST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( labelPWD_, gbc ); // apply constraints getContentPane().add( labelPWD_ ); // Add UID text field to login window gbc.gridx = 2; gbc.gridy = 0; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfUID_, gbc ); // apply constraints getContentPane().add( tfUID_ ); // Add PWD text field to login window gbc.gridx = 2; gbc.gridy = 1; gbc.gridwidth = 2; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.WEST; gbc.fill = GridBagConstraints.HORIZONTAL; gbl.setConstraints( tfPWD_, gbc ); // apply constraints getContentPane().add( tfPWD_ ); // Add OK button to login window gbc.gridx = 1; gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 0; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnOK_, gbc ); // apply constraints getContentPane().add( btnOK_ ); // Add Cancel button to login window gbc.gridx = 2;

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gbc.gridy = 2; gbc.gridwidth = 1; gbc.gridheight = 1; gbc.weightx = 1; gbc.weighty = 1; gbc.anchor = GridBagConstraints.CENTER; gbc.fill = GridBagConstraints.NONE; gbl.setConstraints( btnCancel_, gbc ); // apply constraints getContentPane().add( btnCancel_ ); tfUID_.requestFocus(); } }

// Put focus on ID field

// end of initLayout()

// end of LoginWindow class

// NotepadChild class is the internal frame private class NotepadChild extends JInternalFrame { private JTextArea textArea_ = new JTextArea(); public NotepadChild( String title ) { super( title, true, true, true, true ); // Configure text area textArea_.setLineWrap( true ); textArea_.setWrapStyleWord( true ); textArea_.setToolTipText("Enter / edit text here"); getContentPane().add( BorderLayout.CENTER, textArea_ ); FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 24) ); pack(); setBounds( 50, 50, 300, 150 ); // Register a simple adapter to handle when internal frame // becomes active. addInternalFrameListener( new InternalFrameAdapter(){ public void internalFrameActivated(InternalFrameEvent e) { // Assign my text area as the one referenced by MainWindow MainWindow.this.textArea_ = textArea_; } }); // Create caret listener for textArea_ to react when // selection changes textArea_.addCaretListener( new CaretListener() { public void caretUpdate(CaretEvent e) { boolean isSelection = textArea_.getSelectionStart() != textArea_.getSelectionEnd(); actCut_.setEnabled(isSelection); actCopy_.setEnabled(isSelection); } }); }

// end of NotepadChild ctor

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}

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// end of NotepadChild class

}

// end of MainWindow class

// // // // //

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c; for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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Workshop 8: Using a List Model

ListDemo.java // ListDemo.java // ListModel Exercise import java.awt.*; import java.awt.event.*; import javax.swing.*; class ListDemo extends JFrame { private JTextField text_ = new JTextField(); private DefaultListModel model_ = new DefaultListModel(); public static void main(String[] args) { new ListDemo(args); } private ListDemo(String[] args) { super("JList & ListModel Demonstration"); JList list = new JList(); getContentPane().add(BorderLayout.NORTH, text_); getContentPane().add(BorderLayout.CENTER, new JScrollPane(list)); JButton btn = new JButton("Add Name to Model"); getContentPane().add(BorderLayout.SOUTH, btn); pack(); // Button event handler btn.addActionListener( new ActionListener() { public void actionPerformed( ActionEvent ae ) { model_.addElement( text_.getText() ); text_.setText(""); text_.requestFocus(); } }); // Load a few names into the model

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String[] names = { "Berlin", "Beethoven", "Bach", "Berlioz", "Gershwin", "Lennon", "McCartney", "Mozart", "Stravinsky" }; for( int i = 0; i < names.length; i++ ) model_.addElement( names[i] ); // Apply model list.setModel( model_ ); // Use default closing mechanism to close frame setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE ); setBounds( 200, 100, 300, 400 );

// Size frame

// Set font of entire frame just before showing. FontSetter.setFont( this, new Font("SansSerif", Font.PLAIN, 20) ); show(); } // End of c'tor } // End of class // // // // //

FontSetter is a convenience class. Its one static method, setFont(), is used to change the font setting for all components in a container. This is simply to make the font bigger for display purposes; it has no bearing on the exercise.

class FontSetter { // Change the font of the desired component and // all its contained components and menus. public static void setFont( Component c, Font f ) { if( c instanceof JMenu ) { JMenu mnu = (JMenu) c; for(int i = 0; i < mnu.getMenuComponentCount(); i++) setFont( mnu.getMenuComponent(i), f ); } else if( c instanceof Container ) { Container cont = (Container) c; for(int i = 0; i < cont.getComponentCount(); i++) setFont( cont.getComponent(i), f ); } c.setFont( f ); } }

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