We Keep Coding

How to add mouse listener to JOptionPane button?

I want to change appearance of Button on JOptionPane.ShowMessageDialog.
I have managed to change Button caption with
UIManager.put("OptionPane.okButtonText", "Text I want");
Now, my next goal is to make Button work same as buttons in rest of my app. That is, when hovering mouse over it, it changes background and font color.
On rest of my buttons I added mouse listener like this one:
//setting change color on hover
private final MouseListener mouseAction = new MouseAdapter() {
#Override
public void mouseEntered(MouseEvent e) {
JButton rollOver = (JButton)e.getSource();
if (rollOver.isEnabled()) {
rollOver.setBackground(new Color(163, 184, 204));
rollOver.setForeground(Color.WHITE);
rollOver.setFont(b);
}
};
#Override
public void mouseExited(MouseEvent e) {
JButton rollOver = (JButton)e.getSource();
if (rollOver.isEnabled()) {
rollOver.setBackground(new Color(230, 230, 230));
rollOver.setForeground(Color.BLACK);
rollOver.setFont(f);
}
};
};
Previously in code I have Font varibles set:
Font f = new Font("System", Font.PLAIN, 12);
Font b = new Font("System", Font.BOLD, 12);
I could make new dialogs from scratch and implent this behaviour but that would be overkill.
Is there some way to access Button on JOptionPane and add mouse listener
to it?

UIManager.put("OptionPane.okButtonText", "Text I want");
The above will change the text for all "Ok" buttons on all JOptionPanes that you create.
If you want to change the text on an individual button on a specific JOptionPane then
read the section from the Swing tutorial on Customizing Button Text.
Is there some way to access Button on JOptionPane and add mouse listener to it?
When you use the static showXXX(...) methods a modal JDialog is created so you don't have access to the dialog or its components until the dialog is closed which is too late.
So instead you need to manually create the JOptionPane and add it to a JDialog. The basics of doing this can be found by reading the JOptionPane API and looking at the section titled "Direct Use".
Once you have created the JOptionPane (and before you make the dialog visible) you can then search the option pane for the buttons and add a MouseListener to each button. To help you with this you can use the Swing Utils class. It will do a recursive search of the option pane and return the buttons to you in a List. You can then iterate through the List and add the MouseListener.
The basic code using this helper class would be:
JOptionPane optionPane = new JOptionPane(
"Are you sure you want to exit the application",
JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_CANCEL_OPTION);
List<JButton> buttons = SwingUtils.getDescendantsOfType(JButton.class, optionPane, true);
for (JButton button: buttons)
{
System.out.println( button.getText() );
}

If you want to see the same effect inside all OptionPanels, I think the override BasicOptionPaneUI is a good solution
This is a minimal example
public class MyOptionPaneUI extends BasicOptionPaneUI {
#SuppressWarnings({"MethodOverridesStaticMethodOfSuperclass", "UnusedDeclaration"})
public static ComponentUI createUI(JComponent c) {
return new MyOptionPaneUI();
}
private static final MyMouseListener m = new MyMouseListener();
#Override
public void update(Graphics g, JComponent c) {
super.update(g, c);
}
#Override
protected void installListeners() {
JButton button = (JButton) getButtons()[0];
button.addMouseListener(m);
super.installListeners();
}
#Override
protected void uninstallListeners() {
JButton button = (JButton) getButtons()[0];
button.removeMouseListener(m);
super.uninstallListeners();
}
public static class MyMouseListener extends MouseAdapter{
#Override
public void mouseEntered(MouseEvent e) {
JButton rollOver = (JButton)e.getSource();
if (rollOver.isEnabled()) {
rollOver.setBackground(new Color(163, 184, 204));
rollOver.setForeground(Color.WHITE);
}
};
#Override
public void mouseExited(MouseEvent e) {
JButton rollOver = (JButton)e.getSource();
if (rollOver.isEnabled()) {
rollOver.setBackground(new Color(230, 230, 230));
rollOver.setForeground(Color.BLACK);
}
};
}
}
inside your frame your main class you can add this code for load the class inside the UIDefoult
static{
UIManager.put("OptionPaneUI", MyOptionPaneUI.getClass().getCanonicalName());
}
Because getButtons()[0], because I see this code inside the BasicOptionPaneUI
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"), minimumWidth);
defaultOptions[1] = new ButtonFactory(
UIManager.getString("OptionPane.cancelButtonText",l),
getMnemonic("OptionPane.cancelButtonMnemonic", l),
(Icon)DefaultLookup.get(optionPane, this,
"OptionPane.cancelIcon"), minimumWidth);
} 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"), minimumWidth);
}
inside the method protected Object[] getButtons()
If you want the effect mouse hover on the button I'm working on this library and have the solution for the mouse over.
If you have a possibility to personalize the DefaoultButton inside the library with this constant
UIManager.put("Button[Default].background", new Color(163, 184, 204));
UIManager.put("Button[Default].foreground", Color.WHITE);
UIManager.put("Button[Default].mouseHoverColor", new Color(230, 230, 230));
ps: this is only information if you need to add the mouse hover inside the you project

Get all existing JTextField components in a window and add popup menu to each?

I need to get all existing TextFields in an app window so that I can be able to automatically add popup menus to all of them. How do you do that?
The code is below. How come when I call:
JTextFieldRegularPopupMenu.addToAll(jpanel) it works fine and affects all relevant JTextFields. But when I do it with a JDialog from a regular JDialog netbeans class - JTextFieldRegularPopupMenu.addToAll(this), it doesn't work. What could be the problem?
import java.awt.Component;
import java.awt.Container;
import javax.swing.*;
import java.awt.event.ActionEvent;
import javax.swing.JPopupMenu;
import javax.swing.undo.*;
public class JTextFieldRegularPopupMenu {
public static void addToAll(Container frm) {
JTextField txtTmp = null;
Component[] components = frm.getComponents();
for(int i=0;i<components.length;i++){
if( components[i] instanceof JTextField ){
txtTmp = (JTextField)components[i];
addTo(txtTmp);
}
}
}
public static void addTo(JTextField txtField)
{
JPopupMenu popup = new JPopupMenu();
UndoManager undoManager = new UndoManager();
txtField.getDocument().addUndoableEditListener(undoManager);
Action undoAction = new AbstractAction("Undo") {
#Override
public void actionPerformed(ActionEvent ae) {
if (undoManager.canUndo()) {
undoManager.undo();
}
else {
// No Undo
}
}
};
Action copyAction = new AbstractAction("Copy") {
#Override
public void actionPerformed(ActionEvent ae) {
txtField.copy();
}
};
Action cutAction = new AbstractAction("Cut") {
#Override
public void actionPerformed(ActionEvent ae) {
txtField.cut();
}
};
Action pasteAction = new AbstractAction("Paste") {
#Override
public void actionPerformed(ActionEvent ae) {
txtField.paste();
}
};
Action selectAllAction = new AbstractAction("Select All") {
#Override
public void actionPerformed(ActionEvent ae) {
txtField.selectAll();
}
};
cutAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control X"));
copyAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control C"));
pasteAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control V"));
selectAllAction.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("control A"));
popup.add (undoAction);
popup.addSeparator();
popup.add (cutAction);
popup.add (copyAction);
popup.add (pasteAction);
popup.addSeparator();
popup.add (selectAllAction);
txtField.setComponentPopupMenu(popup);
}
}
Netbeans JFrame Class
public class FrmAddNewUser extends javax.swing.JDialog {
/**
* Creates new form FrmAddNewUser
*/
public FrmAddNewUser(java.awt.Frame parent, boolean modal) {
super(parent, modal);
initComponents();
myInitComponents();
}
private void myInitComponents()
{
JTextFieldRegularPopupMenu.AddToAll(this); //this doesn't work... but works on jpanel objects..
}

It sounds like you are trying make a uniform change to all existing JTextFields, correct? This really depends, but storing all of the objects in a data structure like an ArrayList might be your best bet. Then use a for loop to apply the same change at each index.

Well you can't really do that in advance because windows and components are not all created at the start of an application. So you would need to manage this dynamically as an application creates and displays a window.
One way might be to use a KeyboardFocusManager to listen for focus changes.
When focus changes you can then invoke the getPopupMenuComponent() method to get the popup menu of the component. If the menu is null, then you need to add your popup menu.
Check out Global Event Listeners for a simple example using this concepts that shows how to select all the text when a text field gains focus.
So you would need to modify all your applications to add this listener when you start the application.
Edit:
Using your current approach you would want to pass in a Window object to a method. Then you can use the getContentPane() method to get the contain holding the components.
Then you can use a class like Swing Utils. This will do a recursive search of the content pane to find all components. Then you iterate through the List and add your logic.
Then this code will work for both frames, dialogs etc.
Also, you don't need to always create custom Actions. You can use Actions from the DefaultEditorKit. For example:
JMenuItem copy = new JMenuItem( new DefaultEditorKit.CopyAction() );
The Action can be shared by all menu items.
Or you can look up the default Action from the ActionMap of the text field. See Key Bindings for the action name to use for the lookup. It will also show you the default key binding used for the Action.

Getting source of an event in Java

Is there any way to get the source of an event? I know event.getSource() however, is there any way to convert it into a string?
For example, if the source is a button, button1, is there anyway to assign the value button1 to a string variable? (I'm dealing with a lot of buttons and so, I can't write if statements)

For the sake of clarity:
The getSource() method returns the object from which the Event initially occurred. You could use this to get some sort of property from the element, like the text inside a label or the name of a button.
These are Strings, but if you chose to go this route, I would make sure you pick something that is uniform across all components that will be calling that ActionListerner.
This is where getActionCommand() might come in handy. You can set unique 'identifiers' when components are created, and the access them later.
JButton button = new JButton("Button");
button.setActionCommand("1");
JButton button = new JButton("Button");
button.setActionCommand("2");
Then you can compare these later using any method you like, or you could do something fancy, like this (because you said you didn't want to use if-else statements):
String command = e.getActionCommand();
int i = Integer.parseInt(command);
switch (i) {
case 1: // do something
break;
}
According to the Java docs:
Returns the command string associated with this action. This string allows a "modal" component to specify one of several commands, depending on its state. For example, a single button might toggle between "show details" and "hide details". The source object and the event would be the same in each case, but the command string would identify the intended action.
Keep in mind that I think this is best approach only if you are using one ActionListerner for lots of components. As another answer pointed out, you could just make unique ActionListeners per each button.
Hope this helps you!

You can pass anything you want to an action listener through the constructor, as DaaaahWhoosh stated in his comment.
package com.ggl.fse;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ButtonActionListener implements ActionListener {
private String buttonText;
public ButtonActionListener(String buttonText) {
this.buttonText = buttonText;
}
#Override
public void actionPerformed(ActionEvent event) {
// TODO Auto-generated method stub
}
}
The buttonText String will be available in the actionPerformed method.

You can use a specific ActionListener for each JButton. Try this code:
private static String text;
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(200, 200, 200, 200);
frame.setLayout(new BorderLayout());
JButton button1 = new JButton("Button 1");
button1.addActionListener(new ActionListener() {
#Override public void actionPerformed(ActionEvent e) {
text = button1.getText();
JOptionPane.showMessageDialog(null, "Text is: " + text);
}
});
JButton button2 = new JButton("Button 2");
button2.addActionListener(new ActionListener() {
#Override public void actionPerformed(ActionEvent e) {
text = button2.getText();
JOptionPane.showMessageDialog(null, "Text is: " + text);
}
});
frame.add(button1, BorderLayout.NORTH);
frame.add(button2, BorderLayout.SOUTH);
frame.setVisible(true);
}

Listen to the paste events JTextArea

I want to call a function when the user pastes text in my JTextArea. Is there any event generated when the text is pasted to the JTextArea and which listener can I use to trigger my function on this event?

One possible solution (and I hope some one has a better one) would be to replace the key binding Action responsible for actually performing the paste operation.
Now, before you do this, the default paste operation is not trivial, instead, I would replace the default paste Action with a proxy, which could call the original, but would allow you to intercept the operation, but not have to re-implement the functionality yourself, for example...
public class ProxyAction extends AbstractAction {
private Action action;
public ProxyAction(Action action) {
this.action = action;
}
#Override
public void actionPerformed(ActionEvent e) {
action.actionPerformed(e);
System.out.println("Paste Occured...");
}
}
Then you would simply need to look up the default Action and replace it...
JTextArea ta = new JTextArea(10, 10);
Action action = ta.getActionMap().get("paste-from-clipboard");
ta.getActionMap().put("paste-from-clipboard", new ProxyAction(action));
The problem here is, this won't tell you if the operation failed or succeeded or what was actually pasted. For that, you could use a DocumentListener, registered before you call the default Action which could record the changes to the document. Obviously, you'd want to deregister this after the default action ;)...
Now, equally, you could just override the paste method of the JTextArea, which equates to about the same thing, but, the first option would be more portable...
As an idea...
Take a look at How to Use Actions and How to Use Key Bindings for more details

you can have something like below, whenever you paste something in the textarea, then 'Pasted!' is printed out on your console. It prints only on paste !
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
public class TextAreaDemo extends JFrame {
JTextArea _resultArea = new JTextArea(6, 20);
public TextAreaDemo() {
_resultArea.setText("");
JScrollPane scrollingArea = new JScrollPane(_resultArea);
JPanel content = new JPanel();
content.setLayout(new BorderLayout());
content.add(scrollingArea, BorderLayout.CENTER);
this.setContentPane(content);
this.setTitle("TextAreaDemo B");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
_resultArea.addKeyListener(new KeyListener() {
#Override
public void keyTyped(KeyEvent e) {
}
#Override
public void keyPressed(KeyEvent e) {
if ((e.getKeyCode() == KeyEvent.VK_V) && ((e.getModifiers() & KeyEvent.CTRL_MASK) != 0)) {
System.out.println("Pasted!");
}
}
#Override
public void keyReleased(KeyEvent e) {
}
});
}
public static void main(String[] args) {
JFrame win = new TextAreaDemo();
win.setVisible(true);
}
}

You can also check out Wrapping Actions which is basically the same suggestion as MadProgrammer except that the WrapperAction will delegate all the methods of the Action to the original Action. This will allow you to pick up the text and Icons associated with the original Action in case you ever want to add your custom Action to a JMenuItem or JButton.

Java - JButton text disappears if actionPerformed defined afterwards

This has been bugging me for a while. If I define setText on a JButton before defining setAction, the text disappears:
JButton test = new JButton();
test.setText("test"); // Before - disappears!
test.setAction(new AbstractAction() {
public void actionPerformed(ActionEvent e) {
// do something
}
});
this.add(test);
If it's after, no problems.
JButton test = new JButton();
test.setAction(new AbstractAction() {
public void actionPerformed(ActionEvent e) {
// do something
}
});
test.setText("test"); // After - no problem!
this.add(test);
Furthermore, if I set the text in the JButton constructor, it's fine! Yarghh!
Why does this happen?

As described in the documentation:
Setting the Action results in immediately changing all the properties
described in Swing Components Supporting Action.
Those properties are described here, and include text.

Have a look at
private void setTextFromAction(Action a, boolean propertyChange)
in AbstractButton. You can see it's calling setText() based on the action.
It looks like you can call setHideActionText(true); to sort out your problem.

This is because Action has name for the control as well. Since you are not setting any name in the Action it is getting set to empty string.

1) Listeners put all Events to the EDT,
2) all events are waiting in EDT and output to the screen would be done in one moment
3) you have to split that to the two separate Action inside Listener
setText()
invoke javax.swing.Timer with Action that provide rest of events inside your original ActionListener

If you only want to handle the event, you don't need Action. You can add an ActionListener:
JButton test = new JButton();
test.setText("test");
test.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// do something
}
});
this.add(test);
Calling setAction overrides pre-set text.