How to recieve key events

Hi guys,
in the javax.microedition-package i can't find something like the KeyListener in java.awt.event-package. How can I recieve the Key-char when the user is pressing a key?

you will find this lisetener in canvas package not in form package

Similar Messages

JPanel cannot recieve Key Events?

Hi. I'm trying to make a simple game, which recieves input from the arrow keys and spacebar. The drawing is done inside a paintComponent() method in a JPanel. Therefore, the key events should also be handled in the same JPanel. I can call the addKeyListener() method on the JPanel, but it does not recieve key events. I've tried calling setFocusable(true) but it doesn't seem to do anything. If JPanel can't recieve key events (it can recieve mouse events fine), I have to handle the events in the JFrame, which I'm hesitant to do. My book does it in an applet and applets can recieve key events fine, but I want to make an application.
No working source code here, try to figure out what I'm saying.
Thanks.

Please help me. I did help you. I gave you a link to the tutorial that shows that proper way to do this.
All Swing components use Key Bindings so you might as well take the time to understand how they work.
Anyway, based on your vague description of the problem we can't help you because we don't know the details of your code.

JComboBox Unable to recieve key events

Hello,
I have a Table which contains multiple editors and multiple renderers for different items that may or may not be added in the table. I have added a KeySelectionManager to the ComboBox class that I have defined. When I add this Combo box to a Frame/Panel listener recieves key board events, but when I add the combox box to a table which has other components and listeners, the combo box listener is not getting any events.
How do I tell table to send the event to combo box?
Praveen

I didnot write the code. I am trying to add some enhancements to it. Basically I want the Combo box to scroll as I enter the text.
Coming to your question...All the data I have is in another class and I am using the table.setModel(obj) where obj is the Object in which I have data. After setting the model, I am registering the editors and renderers for table.
Please point to me any good tutorial on how the setModel works. I can see that while initializing the editors, there is a call made to the ComboBox class. May be this is where the ComboBox is getting created.
Does this reply makes some sense?
Thanks for your reply,
Praveen

How to consume key events

I would like to create a subclass of TextBox that only allows numeric input. My idea was to provide my own onKeyType() handler and consume any key events that do not correspond to digits. However, I can't find any way to consume key events from further processing. How do I do this?
Are there any other suggestions how to accomplish the task of providing your own filter concerning valid key input?
/Bengt

I also wanted a kind of validators for the TextBox class of JavaFX. So I've tried solving the problem using the SwingTextField class and some Java APIs. The following is my code for a SwingTextField accepting only digits, but I do want it to be much simpler.
import java.awt.AWTEvent;
import java.awt.event.AWTEventListener;
import java.awt.event.KeyEvent;
import java.awt.Toolkit;
import javafx.ext.swing.SwingTextField;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javax.swing.JComponent;
class DigitKeyEventHookListener extends AWTEventListener {
    public-init var source:JComponent;
    public override function eventDispatched( event:AWTEvent):Void {
        if (event.getSource().equals(source)) {
            var keyEvent : KeyEvent = event as KeyEvent;
            var keyCharacter = keyEvent.getKeyChar();
            var isDigit = false;
            var code = keyEvent.getKeyCode();
           if ((KeyEvent.VK_0 <= keyCharacter) and (keyCharacter <= KeyEvent.VK_9)) {
                   isDigit = true;
            if ((code ==KeyEvent.VK_DELETE) or (code ==KeyEvent.VK_BACK_SPACE)) {
                isDigit = true;
            if ((code ==KeyEvent.VK_LEFT) or (code ==KeyEvent.VK_RIGHT)) {
                isDigit = true;
           if (not isDigit) {
                keyEvent.consume();
function createSwingTextField() : SwingTextField{
    var field = SwingTextField {
        columns:12
    var listener = DigitKeyEventHookListener{
        source: field.getJTextField()
    Toolkit.getDefaultToolkit().addAWTEventListener(listener, AWTEvent.KEY_EVENT_MASK);
    return field;
Stage {
    title: "Digit Box"
    width: 200
    height: 80
    scene: Scene {
        content: createSwingTextField()
}

How to handle key events in iphone

I want to be able to detect physical keyboard (e.g. bluetooth) events in an iOS app.
In Mac, there is a class NSEvent which handles both keyboard and mouse events, and in ios (iphone/ipad) the counterpart of NSEvent is UIEvent which handles only touch events. I know ios API does not provide this functionality, but how can i handle key events in iphone???

in my application header part of the page is common of all page. header.jsff contains comandmenuItem named "proceduralhelp". if I click proceduralhelp a pop up opens .
in my login page when first time I open popup and press escape popup is not closing.
rest of the cases after login escpe will cose the popup.
only on the loginpage that to for the first time it is not closing when pressing up on escape key. (then we click on close button. and once again open the popup in loginpage now if we press escape it works).
Thanks,
Raghavendra.

How to generate key events to a componet without keyboard

I want to generate a key event, a Keylistener is already there, (in fact, java3D's KeyNavigatorBehavior). I want to use other input methods instead of key pressings, so how I generate the key event manually
thx,

Look at java.awt.Robot. It has a keyPress() method to simulate key presses.

How to catch key events

Hello!
I have a component which extends JPanel. Now I dynamically add a JTextField as a child to this component. The problem is: when the textfield has focus, how can I get key events in my panel before the textfield gets them (and maybe intercept them so that the textfield doesn't get them at all)?
Background: the component is a self written table and the textfield is an editor. Now I have to make sure that when I am editing and press e.g. "cursor up", that not the textfield will get this key event but the table (which should traverse the current cell then ...)
The problem is: I cannot change the textfield (extend it or something) because a possible solution has to work with any java awt "Component" (or at least with JComponent).
Any help very appreciated.
Michael

Hello,
implement the keyListener interface for the Extended component...
and in Keypressed method
keyPressed(keyEvent){
// do all ur reuirements here
//and comsume the keyEvent...
hope this helps

How to catch key events in JWindow???

Can somebody please suggest me how do I catch key events in a JWindow. I tried without success with addKeyListener( ) method. My sample code is attached below. I've j2sdk1.4.2_03 in my PC.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class EventCatcher extends JWindow implements KeyListener {
     public EventCatcher() {
          super();
          Container c = getContentPane();
          setBounds(100,100,400,400);
          c.setLayout(new FlowLayout());
          JButton button = new JButton("Hello");
          c.add(button);
addKeyListener(this);
requestFocus();
setVisible(true);
     public void keyReleased(KeyEvent ke) {
System.out.println("**************");
     public void keyPressed(KeyEvent ke) {}
     public void keyTyped(KeyEvent ke) {}
     public static void main(String str[]) {
          new EventCatcher();
Regards,
Koushik

Hi GraemeHook!
This is Khurram. I tried your code on my problem that is 95% like this problem but it could not be solved.
can u please take view on my code.
I m trying to move a frame that extends from JWindow on runtime with Key Board Arrow keys. but this only works when I extend this MainApp class from JFrame, but not when from JWindow.
can u please help me. I also posted my own topic but no one response so found it resambling to my problem.
hoping to hear from u soon
you can also tell me at my email address
[email protected]
thanks
===========================================================
MainApp.java
*MainApp.java
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class MainApp extends JWindow {
static LocationManager appLoc = new LocationManager();
public MainApp() {
    try {
      jbInit();
    catch(Exception e) {
      e.printStackTrace();
public static void main(String[] args) {
   MainApp frm = new MainApp();
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        int width = screenSize.width;
        int height = 45;
          frm.setFocusableWindowState(true);
        frm.setFocusable(true);
        frm.setSize(width, height);
        frm.setLocation(appLoc.setAppAtBottomCentered(width, height));
        frm.setLocation(appLoc.moveAppUpward(100));
        frm.setVisible(true);
private void jbInit() throws Exception {
    this.getContentPane().setBackground(Color.white);
     addKeyListener(new java.awt.event.KeyAdapter(){
      int moveSpeed = 4;//must be even
      public void keyPressed(KeyEvent e){
        //JOptionPane.showMessageDialog(null,""+e.getKeyCode());
         if(e.getKeyCode() == KeyEvent.VK_SHIFT)
          if(moveSpeed==4)
            moveSpeed = 12;
          else
            moveSpeed = 4;
        if(e.getKeyCode() == KeyEvent.VK_UP)
          setLocation(appLoc.moveAppUpward(moveSpeed));
        else if(e.getKeyCode() == KeyEvent.VK_DOWN)
          setLocation(appLoc.moveAppDownward(moveSpeed));
        else if(e.getKeyCode() == KeyEvent.VK_LEFT)
          setLocation(appLoc.moveAppToLeft(moveSpeed));
        else if(e.getKeyCode() == KeyEvent.VK_RIGHT)
          setLocation(appLoc.moveAppToRight(moveSpeed));
        else if(e.getKeyCode() == 107) {//NUMPAD '+' Key For Vertically Increasing
          setSize(appLoc.increaseSize(0,moveSpeed));
          setLocation(appLoc.updateLocation());
        else if(e.getKeyCode() == 109) {//NUMPAD '-' Key For Vertically Decreasing
          setSize(appLoc.decreaseSize(0,moveSpeed));
          setLocation(appLoc.updateLocation());
        else if(e.getKeyCode() == 61) {// '+' Key For Horizontal Increasing
          setSize(appLoc.increaseSize(moveSpeed,0));
          setLocation(appLoc.updateLocation());
        else if(e.getKeyCode() == 45) {// '-' Key For Horizontal Decreasing
          setSize(appLoc.decreaseSize(moveSpeed,0));
          setLocation(appLoc.updateLocation());
}====================================================================
LocationManager.java
* LocationManager.java
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.util.*;
    import java.sql.*;
public class LocationManager {
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    static Point newPoint = new Point();
    static Dimension newDim = new Dimension();
    static Dimension minDim = new Dimension();
    /** Creates a new instance of LocationManager */
    public LocationManager() {
    public LocationManager(int width, int height){
        this.setAppCenteredWithDim(width, height);
    public Point setAppCenteredWithDim(int width, int height){
        //Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      newDim.width = width;
      newDim.height = height;
        int sWidth = screenSize.width;
        int sHeight = screenSize.height;
        newPoint.x = (sWidth-width)/2;
        newPoint.y = (sHeight-height)/2;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point setAppAtTopCentered(int width, int height){
        //Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      newDim.width = width;
      newDim.height = height;
        int sWidth = screenSize.width;
        int sHeight = screenSize.height;
        newPoint.x = (sWidth-width)/2;
        newPoint.y = 0;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point setAppAtBottomCentered(int width, int height){
        //Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      newDim.width = width;
      newDim.height = height;
        int sWidth = screenSize.width;
        int sHeight = screenSize.height;
        newPoint.x = (sWidth-width)/2;
        newPoint.y = (sHeight-height);
        return newPoint;
        //return new Point(this.x, this.y);
    public Point setAppAtRightCentered(int width, int height){
        //Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      newDim.width = width;
      newDim.height = height;
        int sWidth = screenSize.width;
        int sHeight = screenSize.height;
        newPoint.x = 0;
        newPoint.y = (sHeight-height)/2;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point setAppAtLeftCentered(int width, int height){
        //Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      newDim.width = width;
      newDim.height = height;
        int sWidth = screenSize.width;
        int sHeight = screenSize.height;
        newPoint.x = (sWidth-width);
        newPoint.y = (sHeight-height)/2;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point moveAppUpward(int step){
        newPoint.y -= step;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point moveAppDownward(int step){
        newPoint.y += step;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point moveAppToLeft(int step){
        newPoint.x -= step;
        return newPoint;
        //return new Point(this.x, this.y);
    public Point moveAppToRight(int step){
        newPoint.x += step;
        return newPoint;
        //return new Point(this.x, this.y);
    public Dimension increaseSize(int w, int h){
      minDim.width = 116;
      minDim.height = 56;
      newDim.width += w;
      newDim.height +=h;
      if(w==0 && newDim.height > minDim.height)
        newPoint.y -= h/2;
      else if(newDim.width > minDim.width )
        newPoint.x -= w/2;
      return newDim;
    public Dimension decreaseSize(int w, int h){
      minDim.width = 116;
      minDim.height = 56;
      if(newDim.width > minDim.width )
        newDim.width -= w;
      if(newDim.height > minDim.height)
        newDim.height -= h;
      if(w==0 && newDim.height > minDim.height)
        newPoint.y += h/2;
      else if(newDim.width > minDim.width)
        newPoint.x += w/2;
      return newDim;
    public Point updateLocation(){
      return newPoint;
        //return new Point(this.x, this.y);
}===================================================================

How to handle key events in popup component

Is there any possibility to handle keyboard events after a popup is opened
requirement : I want to close popup when I press escape key (by default this functionality is present but in some scenarios this is not working ) so explicitly i want to handle key events for popup.
Thanks,
Raghavendra.

in my application header part of the page is common of all page. header.jsff contains comandmenuItem named "proceduralhelp". if I click proceduralhelp a pop up opens .
in my login page when first time I open popup and press escape popup is not closing.
rest of the cases after login escpe will cose the popup.
only on the loginpage that to for the first time it is not closing when pressing up on escape key. (then we click on close button. and once again open the popup in loginpage now if we press escape it works).
Thanks,
Raghavendra.

How to process key Events in a JTextArea?

does anybody of you know how i can process KeyEvents in a JTextArea object? i know i can use the processKeyEvent-method but i don't want to process the Event on the current Caret-position - it would be cool to process this keyEvent at a given position anywhere in the text... it works if i set the CaretPosition to this special position, do the processKeyEvent-method and restore the Caret to it's original position but i want the user to be able to type at the same time as the KeyEvent on another place in the text is processed...
sorry for my bad english (if it's that bad - i don't know :-) )
greets and thanks,
zeroconf

I think i know one:-)
Try to override insertString() method of your document.
In fact create your subclass of the document.
the insertString method has parameter offset. It's place in the document where changes should be done. All key type events are converted into the insertString() calls.
So you can do like that
class MyDocument extends DefaultStyledDocument {(or extends PlainDocument for JtextArea. it depends which component you use)
public void insertString(int offset,String str,AttributeSet a) {
int newOffset=getNewOffset(); //get real offset where you want to insert/remove content
super.insertString(newOffset,str,a);
JTextArea ta=new JtextArea();
tc.setDocument(new MyDocuemnt()); //replace default document
regards
Stas

How to generate key events programmatically

Hello friends,
I am developing an application that would automaticall trigger some keboard events for this purpose i would like to trigger an event like alt+f4 i.e pressing alt+f4 together
How can we do this using java
regards
hari

You should be able to use the java.awt.Robot class to perform programmatic UI events.
It doesn't seem that it permits use to do things like keyPress("alt-f4") so you might have to do something like this:
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_ALT);
robot.keyPress(KeyEvent.VK_F4);
robot.keyRelease(KeyEvent.VK_F4);
robot.keyRelease(KeyEvent.VK_ALT);Hope this helps.

How to pass Key Event from command prompt to the java application

If iam running a application that displays JFrame when i pressed CTR+C at the command prompt i.e console window please let me know how can it be passed to the JFrame ie application window

I doubt that you can pass Ctrl+C to the application since the application is terminated by this key combination.
You would try adding a WindowListener or may use a shutdown hook to capture the termination of the JVM.

How to send Remote controller key event

Hi Sir,
Can anyone tell me "how to send key event from "Remote
Controller" to Flex application?
for example. I want to control the Flash player or my Flex UI
application from remote controller such as use firefly
controller/streamzap controller/Gyration controller. Normally user
will use mouse or keyboard to enter/generate event, now I want to
use "Remote controller" to generate the key event. In Flex, how can
I capture the key event from "remote controller"? Any sample code
to provide that will be good.
Thanks.
Lin

Here's a couple related threads
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=583877
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=712386
I'd also suggest exploring the Search Forums available on the left,
which is how I found those threads:
http://onesearch.sun.com/search/onesearch/index.jsp?qt=focus+traversal+tab+text&subCat=siteforumid%3Ajava57&site=dev&dftab=siteforumid%3Ajava57&chooseCat=javaall&col=developer-forums

Associating key events to a TextBox

Hello All!
Can anybody tell me how to associate key events with a TextBox? Something like when a certain key is pressed and released, a certain combinations of characters is inserted e.g. =-)
I am trying to develop a simple application that allows users to type text with non-English characters, e.g. Russian and for that I have created a canvas and I am using key events i.e. KeyPressed and KeyReleased methods. Using a canvas is a bit insufficient because users cannot move the cursor freely through the text.
I have read on te web that I can create a CustomeItem and override the KeyPressed methods but I could not do it; I could not find any simlar code example.
Can anybody help me by providing me with a simple example or suggesting me an alternative way?
Many thanks in advance

{color:#008080}*Hello again!*
I managed to create a CustomItem that overrides KeyPressed method, but now I am having difficulties making my textBox reacts to my keyPressed method.
The early version of this CustomeItem overrides the KeyPressed method by assigning each key to a certain collection of chars. When a key is pressed, a string of these chars is drawn on the Canvas, which works fine. Now because I want to be able to edit the text, e.g. delete a certain char in the middle of the string, I want to use a TextBox or a TextField. The current problem is that my TextBox does not react to my key presses the way I want (I used setString() method); it reacts to the original key presses which print the original chars (from A through to Z and 1 through to 9).
Is it possible to set the contents of a TextBox or TextField depending on my key presses? Could you suggest me an alternative way?
Many thanks in advance!!{color}

Handling Key Event

How to handle key events in the Console?
Plz give sample code for it.
Thanks in advance.

Don't have any experience with it personally, but I think curses does this type of thing http://sourceforge.net/projects/javacurses/

How to recieve key events

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