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posted 19 years ago

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Hi all,
I am very much new to swing and awt. I have a simple problem with my dialog box. (JDialogBox.showErrorMessage(....)) I am using dialog box to pop-up error messages. but when the user uses mouse to click on yes or no then even is generated correctly, but when the user hit enter key after focusing on NO , still it is generating the event for YES. something wrong with my implementation ? or this is expected result ? plz help me.

Maha Hassan

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posted 19 years ago

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hi
maybe there is something wrong with the events ..maybe there is no keyboard event for the no button,,check the events again
Good luck
Maha

Mahesh x Bogadi

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posted 19 years ago

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To show error / warning messages use JOptionPane.
They are helpful,
No need to create you own Dialog

Sanju Thomas

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Yes, I was talking about the JOptionPane only. when I used the JOptionPane to pop up error message that is taking Yes value when I hit enter even if the focus is set on No. I did not create any DialogBox my own, I just used JOptionPane to popup a message. I did not add any event for it. JOptionPane is responding perfeclty when I use mouse click, even when I use space also it is responding correctly. But when I hit enter key it is giving only the Yes value even if the focus in set on No. This is what the problem is, any idea ?

Sanju Thomas

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I was talking about this code fragment.

This is returning same value on Enter Key regardless of the focus. But in the mouse click it is returning the correct value. Please give your valuable comments.
[ August 18, 2005: Message edited by: Sanju Thomas ]

Sanju Thomas

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Please some one help me.

Craig Wood

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In the app below the 'enter' key always seems to invoke the option that is the
'initialValue' in the dialog, ie, the button that is initially selected. This only seems to
work for the metal plaf. The option designated as the 'initialValue' in the constructor seems
to function like a default command button for the dialog. See paragraph four and Table 8
under the 'Keyboard Navigation and Activation' section of page 6 in the
'Java Look and Feel Guidelines'. Also the 'Default Command Buttons' section on
page 8.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class DialogTest
{
 private void testDefaultOptions(Frame frame)
 {
 Object message = new JLabel("<html>" +
 "default option buttons", JLabel.CENTER);
 String title = "default options";
 int retVal = JOptionPane.showOptionDialog(frame,
 message,
 title,
 JOptionPane.YES_NO_CANCEL_OPTION,
 JOptionPane.PLAIN_MESSAGE,
 null,
 null,
 null);
 showResult("default", retVal);
 }
 
 private void testWithInitialValue(Frame frame)
 {
 Object message = new JLabel("<html>" +
 "initial value specified", JLabel.CENTER);
 String title = "default with initial value";
 Object[] options = { "yes", "no", "cancel" };
 int retVal = JOptionPane.showOptionDialog(frame,
 message,
 title,
 JOptionPane.YES_NO_CANCEL_OPTION,
 JOptionPane.PLAIN_MESSAGE,
 null,
 options,
 options[0]);
 showResult("initial", retVal);
 }
 
 private void testWithCustomOptions(Frame frame)
 {
 Object message = new JLabel("<html>" +
 "custom options", JLabel.CENTER);
 String title = "supplied options";
 Object[] options = { "one", "two", "three", "four" };
 int retVal = JOptionPane.showOptionDialog(frame,
 message,
 title,
 JOptionPane.YES_NO_CANCEL_OPTION,
 JOptionPane.PLAIN_MESSAGE,
 null,
 options,
 options[1]);
 showResult("custom ", retVal);
 }
 
 private void showResult(String id, int retVal)
 {
 String s;
 switch(retVal)
 {
 case JOptionPane.CLOSED_OPTION: // -1
 s = "CLOSED_OPTION";
 break;
 case JOptionPane.YES_OPTION: // 0
 s = "YES_OPTION";
 break;
 case JOptionPane.NO_OPTION: // 1
 s = "NO_OPTION";
 break;
 case JOptionPane.CANCEL_OPTION: // 2
 s = "CANCEL_OPTION";
 break;
 default:
 s = "unknown";
 }
 System.out.println(id + " retVal = " + s);
 }
 
 private JPanel getUIPanel(final Frame f)
 {
 final JButton
 noOptions = new JButton("default options"),
 initialVal = new JButton("initail value"),
 customOptions = new JButton("supplied options");
 ActionListener l = new ActionListener()
 {
 public void actionPerformed(ActionEvent e)
 {
 JButton button = (JButton)e.getSource();
 if(button == noOptions)
 testDefaultOptions(f);
 if(button == initialVal)
 testWithInitialValue(f);
 if(button == customOptions)
 testWithCustomOptions(f);
 }
 };
 noOptions.addActionListener(l);
 initialVal.addActionListener(l);
 customOptions.addActionListener(l);
 JPanel panel = new JPanel(new GridBagLayout());
 GridBagConstraints gbc = new GridBagConstraints();
 gbc.weighty = 1.0;
 gbc.gridwidth = gbc.REMAINDER;
 panel.add(noOptions, gbc);
 panel.add(initialVal, gbc);
 panel.add(customOptions, gbc);
 return panel;
 }
 
 private JMenu getPLAFMenu(final JFrame f)
 {
 JMenu view = new JMenu("view");
 ActionListener l = new ActionListener()
 {
 public void actionPerformed(ActionEvent e)
 {
 JMenuItem item = (JMenuItem)e.getSource();
 String className = item.getActionCommand();
 changePLAF(className, f);
 }
 };
 UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();
 for(int j = 0; j < info.length; j++)
 {
 JMenuItem item = new JMenuItem(info[j].getName());
 item.setActionCommand(info[j].getClassName());
 item.addActionListener(l);
 view.add(item);
 }
 return view;
 }
 
 private void changePLAF(String className, JFrame f)
 {
 try
 {
 UIManager.setLookAndFeel(className);
 }
 catch(ClassNotFoundException cnfe)
 {
 System.err.println("class not found: " + cnfe.getMessage());
 }
 catch(InstantiationException ie)
 {
 System.err.println("instantiation: " + ie.getMessage());
 }
 catch(IllegalAccessException iae)
 {
 System.err.println("illegal access: " + iae.getMessage());
 }
 catch(UnsupportedLookAndFeelException ulafe)
 {
 System.err.println("unsupported laf: " + ulafe.getMessage());
 }
 SwingUtilities.updateComponentTreeUI(f.getRootPane());
 }
 
 public static void main(String[] args)
 {
 DialogTest test = new DialogTest();
 JFrame f = new JFrame();
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 JMenuBar menuBar = new JMenuBar();
 menuBar.add(test.getPLAFMenu(f));
 f.setJMenuBar(menuBar);
 f.getContentPane().add(test.getUIPanel(f));
 f.setSize(250,200);
 f.setLocation(200,200);
 f.setVisible(true);
 }
}

ps — try using the 'spacebar' to activate the buttons instead of the 'enter' key.
[ August 19, 2005: Message edited by: Craig Wood ]

Sanju Thomas

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Thank you Craig, but Craig, is there any way to override this feature.

Michael Dunn

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posted 19 years ago

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is this what you're trying to do?

Sanju Thomas

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Craig , Thank you for replay .

I was aware that it will work with Window look and feel, but I was asking that is there any way to get this feature in metal look and feel.

if there is some solution please send me a replay.

Craig Wood

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The defaultButton behavior seems to come from one or two places in the
javax.swing.plaf.basic.BasicOptionPaneUI class. The block under the
"counter == initialIndex" test adds an AncestorListener to the first JButton which sets it
as the defaultButton each time the button is made visible. I could not find a way to
remove/prevent the resulting action.

This minimal subclass of BasicOptionPaneUI seems to avoid the defaultButton issue. I tried
to map the "Enter" key to the optionPane JButtons to work like they do with the "Space"
bar/key. Seems to work okay so far.

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
import javax.swing.*;
 
public class OptionPaneTest
{
 // if using j2se 1.4 or earlier, remove the [ <JButton> ]
 // from this declaration
 List<JButton> buttonList; // generics requires j2se 1.5+
 
 public OptionPaneTest()
 {
 // and from this instantiation statement
 buttonList = new ArrayList<JButton>();
 }
 
 private int launchOptionPane()
 {
 JOptionPane optionPane = new JOptionPane("option pane",
 JOptionPane.PLAIN_MESSAGE,
 JOptionPane.YES_NO_CANCEL_OPTION);
 optionPane.setUI(new CustomUI());
 registerEnterKey(optionPane);
 JDialog dialog = optionPane.createDialog(null, "dialog");
 dialog.setVisible(true);
 
 Object selectedValue = optionPane.getValue();
 if(selectedValue == null)
 return JOptionPane.CLOSED_OPTION;
 if(selectedValue instanceof Integer)
 {
 int value = ((Integer)selectedValue).intValue();
 String s;
 switch(value)
 {
 case JOptionPane.CLOSED_OPTION: // -1
 s = "CLOSED_OPTION";
 break;
 case JOptionPane.YES_OPTION: // 0
 s = "YES_OPTION";
 break;
 case JOptionPane.NO_OPTION: // 1
 s = "NO_OPTION";
 break;
 case JOptionPane.CANCEL_OPTION: // 2
 s = "CANCEL_OPTION";
 break;
 default:
 s = "unknown value: " + value;
 }
 System.out.println(s);
 return value;
 }
 return JOptionPane.CLOSED_OPTION;
 }
 
 private void registerEnterKey(JOptionPane jop)
 {
 // load buttonList with optionPane JButtons
 traverseHierarchy(jop);
 // register "Enter" key with each JButton
 for(int j = 0; j < buttonList.size(); j++)
 {
 JButton button = (JButton)buttonList.get(j);
 button.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "ENTER");
 button.getActionMap().put("ENTER", enter);
 }
 }
 
 private void traverseHierarchy(Container cont)
 {
 Component[] c = cont.getComponents();
 for(int j = 0; j < c.length; j++)
 {
 //System.out.println(c[j].getClass().getName());
 if(((Container)c[j]).getComponentCount() > 0)
 traverseHierarchy((Container)c[j]);
 if(c[j] instanceof JButton)
 buttonList.add((JButton)c[j]);
 }
 }
 
 private Action enter = new AbstractAction()
 {
 public void actionPerformed(ActionEvent e)
 {
 JButton button = (JButton)e.getSource();
 String ac = button.getActionCommand().toLowerCase();
 int value = JOptionPane.CLOSED_OPTION;
 if(ac.equals("yes"))
 value = JOptionPane.YES_OPTION;
 if(ac.equals("no"))
 value = JOptionPane.NO_OPTION;
 if(ac.equals("cancel"))
 value = JOptionPane.CANCEL_OPTION;
 getOptionPane(button).setValue(new Integer(value));
 }
 };
 
 private JOptionPane getOptionPane(Component c)
 {
 while((c = c.getParent()) != null)
 if(c instanceof JOptionPane)
 return (JOptionPane)c;
 return null;
 }
 
 private JMenu getPLAFMenu(final JFrame f)
 {
 JMenu view = new JMenu("view");
 ActionListener l = new ActionListener()
 {
 public void actionPerformed(ActionEvent e)
 {
 JMenuItem item = (JMenuItem)e.getSource();
 String className = item.getActionCommand();
 changePLAF(className, f);
 }
 };
 UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();
 for(int j = 0; j < info.length; j++)
 {
 JMenuItem item = new JMenuItem(info[j].getName());
 item.setActionCommand(info[j].getClassName());
 item.addActionListener(l);
 view.add(item);
 }
 return view;
 }
 
 private void changePLAF(String className, JFrame f)
 {
 try
 {
 UIManager.setLookAndFeel(className);
 }
 catch(ClassNotFoundException cnfe)
 {
 System.err.println("class not found: " + cnfe.getMessage());
 }
 catch(InstantiationException ie)
 {
 System.err.println("instantiation: " + ie.getMessage());
 }
 catch(IllegalAccessException iae)
 {
 System.err.println("illegal access: " + iae.getMessage());
 }
 catch(UnsupportedLookAndFeelException ulafe)
 {
 System.err.println("unsupported laf: " + ulafe.getMessage());
 }
 SwingUtilities.updateComponentTreeUI(f.getRootPane());
 f.pack();
 }
 
 private JPanel getUIPanel()
 {
 JButton launch = new JButton("launch option pane");
 launch.addActionListener(new ActionListener()
 {
 public void actionPerformed(ActionEvent e)
 {
 launchOptionPane();
 }
 });
 JPanel panel = new JPanel();
 panel.add(launch);
 return panel;
 }
 
 public static void main(String[] args)
 {
 OptionPaneTest test = new OptionPaneTest();
 JFrame f = new JFrame();
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 JMenuBar menuBar = new JMenuBar();
 menuBar.add(test.getPLAFMenu(f));
 f.setJMenuBar(menuBar);
 f.getContentPane().add(test.getUIPanel(), "North");
 f.setSize(200,100);
 f.setLocation(200,200);
 f.setVisible(true);
 }
}
 
/* everything below has been copied from class
 * javax.swing.plaf.basic.BasicOptionPaneUI
 * which is found in the sdk 1.5/src folder
 * the two commented-out sections are where a defaultButton property
 * can be set for a JOptionPane dialog using Metal LookAndFeel
 * this is part of an attempt to remove the defaultButton assignment
 * and to map the "Enter" key to activate the focused JButton
 */
import java.awt.*;
import java.awt.event.*;
import java.util.Locale;
import sun.swing.DefaultLookup;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
 
public class CustomUI extends BasicOptionPaneUI {
 public CustomUI() {
 super();
 }
 
 /**
 * Creates a new CustomUI instance.
 */
 public static ComponentUI createUI(JComponent x) {
 return new CustomUI();
 }
 
 /**
 * Creates the appropriate object to represent each of the objects in
 * <code>buttons</code> and adds it to <code>container</code>. This
 * differs from addMessageComponents in that it will recurse on
 * <code>buttons</code> and that if button is not a Component
 * it will create an instance of JButton.
 */
 protected void addButtonComponents(Container container, Object[] buttons,
 int initialIndex) {
 if (buttons != null && buttons.length > 0) {
 boolean sizeButtonsToSame = getSizeButtonsToSameWidth();
 boolean createdAll = true;
 int numButtons = buttons.length;
 JButton[] createdButtons = null;
 int maxWidth = 0;
 
 if (sizeButtonsToSame) {
 createdButtons = new JButton[numButtons];
 }
 
 for(int counter = 0; counter < numButtons; counter++) {
 Object button = buttons[counter];
 Component newComponent;
 
 if (button instanceof Component) {
 createdAll = false;
 newComponent = (Component)button;
 container.add(newComponent);
 hasCustomComponents = true;
 } else {
 JButton aButton;
 
 if (button instanceof ButtonFactory) {
 aButton = ((ButtonFactory)button).createButton();
 }
 else if (button instanceof Icon)
 aButton = new JButton((Icon)button);
 else
 aButton = new JButton(button.toString());
 
 aButton.setName("OptionPane.button");
 aButton.setMultiClickThreshhold(DefaultLookup.getInt(
 optionPane, this, 
 "OptionPane.buttonClickThreshhold",
 0));
 configureButton(aButton);
 
 container.add(aButton);
 
 ActionListener buttonListener = createButtonActionListener(counter);
 if (buttonListener != null) {
 aButton.addActionListener(buttonListener);
 }
 newComponent = aButton;
 }
 if (sizeButtonsToSame && createdAll && (newComponent instanceof JButton)) {
 createdButtons[counter] = (JButton)newComponent;
 maxWidth = Math.max(maxWidth, newComponent.getMinimumSize().width);
 }
/*
 if (counter == initialIndex) {
 initialFocusComponent = newComponent;
 if (initialFocusComponent instanceof JButton) {
 JButton defaultB = (JButton)initialFocusComponent;
 defaultB.addAncestorListener(new AncestorListener() {
 public void ancestorAdded(AncestorEvent e) { 
 JButton defaultButton = (JButton)e.getComponent();
 JRootPane root = SwingUtilities.getRootPane(defaultButton);
 if (root != null) {
 root.setDefaultButton(defaultButton);
 }
 }
 public void ancestorRemoved(AncestorEvent event) {}
 public void ancestorMoved(AncestorEvent event) {}
 });
 }
 }
*/
 }
 ((ButtonAreaLayout)container.getLayout()).
 setSyncAllWidths((sizeButtonsToSame && createdAll));
 /* Set the padding, windows seems to use 8 if <= 2 components,
 otherwise 4 is used. It may actually just be the size of the
 buttons is always the same, not sure. */
 if (DefaultLookup.getBoolean(optionPane, this,
 "OptionPane.setButtonMargin", true) && sizeButtonsToSame &&
 createdAll) {
 JButton aButton;
 int padSize;
 
 padSize = (numButtons <= 2? 8 : 4);
 
 for(int counter = 0; counter < numButtons; counter++) {
 aButton = createdButtons[counter];
 aButton.setMargin(new Insets(2, padSize, 2, padSize));
 }
 }
 }
 }
 
 /**
 * Returns the buttons to display from the JOptionPane the receiver is
 * providing the look and feel for. If the JOptionPane has options
 * set, they will be provided, otherwise if the optionType is
 * YES_NO_OPTION, yesNoOptions is returned, if the type is
 * YES_NO_CANCEL_OPTION yesNoCancelOptions is returned, otherwise
 * defaultButtons are returned.
 */
 protected Object[] getButtons() {
 if (optionPane != null) {
 Object[] suppliedOptions = optionPane.getOptions();
 
 if (suppliedOptions == null) {
 Object[] defaultOptions;
 int type = optionPane.getOptionType();
 Locale l = optionPane.getLocale();
 if (type == JOptionPane.YES_NO_OPTION) {
 defaultOptions = new ButtonFactory[2];
 defaultOptions[0] = new ButtonFactory(
 UIManager.getString("OptionPane.yesButtonText", l),
 getMnemonic("OptionPane.yesButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.yesIcon"));
 defaultOptions[1] = new ButtonFactory(
 UIManager.getString("OptionPane.noButtonText", l),
 getMnemonic("OptionPane.noButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.noIcon"));
 } else if (type == JOptionPane.YES_NO_CANCEL_OPTION) {
 defaultOptions = new ButtonFactory[3];
 defaultOptions[0] = new ButtonFactory(
 UIManager.getString("OptionPane.yesButtonText", l),
 getMnemonic("OptionPane.yesButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.yesIcon"));
 defaultOptions[1] = new ButtonFactory(
 UIManager.getString("OptionPane.noButtonText",l),
 getMnemonic("OptionPane.noButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.noIcon"));
 defaultOptions[2] = new ButtonFactory(
 UIManager.getString("OptionPane.cancelButtonText",l),
 getMnemonic("OptionPane.cancelButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.cancelIcon"));
 } else if (type == JOptionPane.OK_CANCEL_OPTION) {
 defaultOptions = new ButtonFactory[2];
 defaultOptions[0] = new ButtonFactory(
 UIManager.getString("OptionPane.okButtonText",l),
 getMnemonic("OptionPane.okButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.okIcon"));
 defaultOptions[1] = new ButtonFactory(
 UIManager.getString("OptionPane.cancelButtonText",l),
 getMnemonic("OptionPane.cancelButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.cancelIcon"));
 } else {
 defaultOptions = new ButtonFactory[1];
 defaultOptions[0] = new ButtonFactory(
 UIManager.getString("OptionPane.okButtonText",l),
 getMnemonic("OptionPane.okButtonMnemonic", l),
 (Icon)DefaultLookup.get(optionPane, this,
 "OptionPane.okIcon"));
 }
 return defaultOptions;
 }
 return suppliedOptions;
 }
 return null;
 }
 
 private int getMnemonic(String key, Locale l) {
 String value = (String)UIManager.get(key, l);
 
 if (value == null) {
 return 0;
 }
 try {
 return Integer.parseInt(value);
 }
 catch (NumberFormatException nfe) { }
 return 0;
 }
 
 /**
 * If inputComponent is non-null, the focus is requested on that,
 * otherwise request focus on the default value
 */
 public void selectInitialValue(JOptionPane op) {
 if (inputComponent != null)
 inputComponent.requestFocus();
 else if (initialFocusComponent != null) {
 initialFocusComponent.requestFocus();
/*
 if (initialFocusComponent != null)
 initialFocusComponent.requestFocus();
 
 if (initialFocusComponent instanceof JButton) {
 JRootPane root = SwingUtilities.getRootPane(initialFocusComponent);
 if (root != null) {
 root.setDefaultButton((JButton)initialFocusComponent);
 }
 }
*/
 }
 }
 
 /**
 * Configures any necessary colors/fonts for the specified button
 * used representing the button portion of the optionpane.
 */
 private void configureButton(JButton button) {
 Font buttonFont = (Font)DefaultLookup.get(optionPane, this,
 "OptionPane.buttonFont");
 if (buttonFont != null) {
 button.setFont(buttonFont);
 }
 }
 
 /**
 * This class is used to create the default buttons. This indirection is
 * used so that addButtonComponents can tell which Buttons were created
 * by us vs subclassers or from the JOptionPane itself.
 */
 private static class ButtonFactory {
 private String text;
 private int mnemonic;
 private Icon icon;
 
 ButtonFactory(String text, int mnemonic, Icon icon) {
 this.text = text;
 this.mnemonic = mnemonic;
 this.icon = icon;
 }
 
 JButton createButton() {
 JButton button = new JButton(text);
 if (icon != null) {
 button.setIcon(icon);
 }
 if (mnemonic != 0) {
 button.setMnemonic(mnemonic);
 }
 return button;
 }
 }
}

Sanju Thomas

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posted 19 years ago

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Thanks Craig, I could not give a test on it, bcz my machine is loaded with 1.4, I can't change in this point bcz project is on the last phase. I will test it and give my update.

Thank you very much for spending some time for me.

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