Regarding key event

hi
how can i catch the keycode event for <b>Enter Key</b>?
thanks in advance

Hi Tommy,
Select Case pVal.EventType
                    Case SAPbouiCOM.BoEventTypes.et_KEY_DOWN
                        Try
                            If pVal.FormTypeEx = "formtype" Then
                                If pVal.ItemUID = "field" Then
                                    if pval.CharPressed = 13 'enter key
                                        'do your code here
                                    End If
                                End If
                            End If
                        Catch ex As Exception
                        End Try
Hope it helps,
Adele

Similar Messages

Object Movement with Key Events

Hi everybody!
Im trying to move an object over the screen with keyboard buttons. The problem I have come across with is that I would like to use the right button to move right, up button to move forward, etc. but I cant push, for example, right and up buttons at the same time to make a diagonal movement. How can I solve this?
Thank you and regards.

I added key events to a sequence and than check them in the program.
Something like this:
class Car extends CustomNode {
    var keys:KeyCode[];
    public override function create(): Node {
        ImageView {
            transforms: [ Translate{ x: bind x, y: bind y }, Rotate{ angle: bind direction}]
            x: -w
            y: -h
            image: Image { url: "{__DIR__}car.png"}
            onKeyPressed: function( e: KeyEvent ) {
                insert e.code into keys;
                if(e.code == KeyCode.VK_UP){
                    ds = 2.0;
                }else if(e.code == KeyCode.VK_DOWN){
                    ds = -2.0;
                }else if(e.code == KeyCode.VK_LEFT){
                    da = -1.0;
                }else if(e.code == KeyCode.VK_RIGHT){
                    da = 1.0;
            onKeyReleased: function( e: KeyEvent ) {
                delete e.code from keys;
    public function move(){
          // check keys
}

KEY events in MIDlets

Hello all,
I am basically new to J2ME MIDP development and also new to this
forum. So apologies if this has already been covered or turns out to
be a stupid question :) Here goes:
I am trying to develop a MIDlet where I have a Form to accept certain
values from the user. This is fairly straightforward and is easy to
create with the high level Form a and TextField objects.
Now, I wish to add a functionality to my MIDlet, in which, the user
can press a specific key.. say the "Select" key or the "Call" key.. at
any time during the form to start another thread of operation which
performs something totally different... say for example, the user is
entering values into the form and in between somewhere he presses this
specific key and the phone start playing music. I hope you get my
point.
Basically I want to listen for key pressed or key held events on a
Form object. Now I understand that Key events can be found only on the
low-level Canvas based UIs. So is it possible to do it with Screen class
elements..?
Thanks,
Nik

You can try to use a CustomItem. What events will be delivered to the custom item depends on the implementation, though. Also these events will be only delivered when the CustomItem is focused.
Have a look at the J2ME Polish GUI for using CustomItems for MIDP/1.0 devices as well.
http://www.j2mepolish.org
Best regards,
Robert

Binding Mouse and Key Events.

Hi,
When a user clicks the Ctrl + V the data from the clipboard
is pasted into the user area. Instead of using this can we do it
using a mouse click. For now, I am planning to bind the event code
of these combinations (CTRL + V == 86) to the mouse click. But when
I tried this I am unable to bind this key event to the mouse event.
Can anyone help me out for getting out of this problem.
Regards,
eodC.

No, it isn't.
Kind regards,
Levi

Listening Tab Key Event On JTextField

Hi
i am unable to listen Tab Key Event on JTextField ....
tField.addKeyListener(new KeyAdapter()
public void keyPressed(KeyEvent e)
if (e.getKeyCode()==e.VK_TAB)
JOptionPane.showMessageDialog(null,"Tab Pressed");
else
JOptionPane.showMessageDialog(null,"Tab Not Pressed");
When i pressed Tab Key then it dont come in KeyPressed Event ...Actually it go towards next FocusAble component ..
Any help in this regard.....

I also Checked it by using
tField..setFocusTraversalKeysEnabled(false);
tField.addKeyListener(new KeyAdapter()
public void keyPressed(KeyEvent e)
if (e.getKeyCode()==e.VK_TAB)
JOptionPane.showMessageDialog(null,"Tab Pressed");
else
JOptionPane.showMessageDialog(null,"Tab Not Pressed");
In this case each time e.getKeyCode() returns 0...
plz help me

How to handle Shift+Tab key event

HI,
This is Ramesh.I have added KeyListener to JTable. I am handling key events through key codes. But I am
unable to handling multiple key strokes like Shift+Tab
Can any one please give me suggestion how can I do it
Thanks & Regards
Ramesh K

i dont know about Key BindingsWhich is why you where given a link to the tutorial in the first response.
can you please give me suggestion.You've been given the suggestion 3 times. You can decide to learn to write code the way other Swing components are written. Or, you can do it the old way. The choice is up to you.

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);
}===================================================================

Simulation of Key events ????

Hello there,
I would like to simulate a succession of pressed key events in order to trace the mem. allocations of a midlet under constant setup.
How could I trigger those events from my application ? which low-level method should I called ?
I tied to found myself in the API and also to 'google' for a solution, but so far it wasn't successful....
Any idea will be welcome !
Thanks

Hi khsay!
If you are using Windows as OS you can never get your application to run in realtime, you have to use LV Realtime to do that.
If you use the event structur i a while loop you get as close as possible, i think.
I have modified your caps.vi so it reacts on booth CAPS button and CAPS key on the keyboard.
Hope this helps!
Regards
/Thomas
Attachments:
caps[1].vi ‏41 KB

Send a press key event without Batch Input?

Hi.
I need send a auto press key event (by example: press F8), by code.
When I put a instruction in the report, the report simulate the key pressed.
Exist some FM to do it? Is it posible?
Thanks!

Hi Marcos,
you can use the method I recommended in an additional timer object method .
Please adapt the below sample program I used to display the current time with auto update:
*& Report ZZCLOCK
*& may be used to keep connection
REPORT zzclock.
*       CLASS lcl_gui_timer DEFINITION
class lcl_gui_timer definition inheriting from cl_gui_control.
PUBLIC SECTION.
    CONSTANTS: eventid_finished TYPE i VALUE 1 .
    CLASS-DATA: interval TYPE i VALUE '0'.
    EVENTS:     finished .
    METHODS:
             cancel
                  EXCEPTIONS
                     error,
             constructor
                 IMPORTING
                     lifetime TYPE i OPTIONAL
                     value(shellstyle) TYPE i OPTIONAL
                     value(parent) TYPE REF TO cl_gui_container OPTIONAL
                 EXCEPTIONS
                     error,
             run
                 EXCEPTIONS
                     error,
             dispatch REDEFINITION.
ENDCLASS.                    "lcl_gui_timer DEFINITION
*       CLASS lcl_event_handler DEFINITION
CLASS lcl_event_handler DEFINITION.
PUBLIC SECTION.
    CLASS-METHODS:
                on_finished
                       FOR EVENT finished OF lcl_gui_timer.
ENDCLASS.                    "lcl_event_handler DEFINITION
DATA: gui_timer TYPE REF TO lcl_gui_timer.
DATA: event_handler TYPE REF TO lcl_event_handler.
DATA: timeout_interval TYPE i VALUE '9'.
PARAMETERS:
            p_datum TYPE sy-datum,
            p_uzeit TYPE sy-uzeit.
AT SELECTION-SCREEN OUTPUT.
* set to time rounded to 10 seconds
p_datum = sy-datum.
p_uzeit = sy-uzeit.
CREATE OBJECT gui_timer.
SET HANDLER event_handler->on_finished FOR gui_timer.
gui_timer->interval = timeout_interval.
CALL METHOD gui_timer->run.
*       CLASS lcl_event_handler IMPLEMENTATION
CLASS lcl_event_handler IMPLEMENTATION.
METHOD on_finished.
* Start Timer again
    gui_timer->interval = timeout_interval.
    CALL METHOD gui_timer->run.
* cause PAI
    CALL METHOD cl_gui_cfw=>set_new_ok_code
      EXPORTING
        new_code = 'REFR'.
ENDMETHOD.                    "on_finished
ENDCLASS.                    "lcl_event_handler IMPLEMENTATION
*       CLASS lcl_gui_timer IMPLEMENTATION
CLASS lcl_gui_timer IMPLEMENTATION.
METHOD constructor.
    TYPE-POOLS: sfes.
    DATA clsid(80).
    DATA event_tab TYPE cntl_simple_events.
    DATA event_tab_line TYPE cntl_simple_event.
    IF clsid IS INITIAL.
      DATA: return,
            guitype TYPE i.
      guitype = 0.
      CALL FUNCTION 'GUI_HAS_OBJECTS'
        EXPORTING
          object_model = sfes_obj_activex
        IMPORTING
          return       = return
        EXCEPTIONS
          OTHERS       = 1.
      IF sy-subrc NE 0.
        RAISE error.
      ENDIF.
      IF return = 'X'.
        guitype = 1.
      ENDIF.
      IF guitype = 0.
        CALL FUNCTION 'GUI_HAS_OBJECTS'
          EXPORTING
            object_model = sfes_obj_javabeans
          IMPORTING
            return       = return
          EXCEPTIONS
            OTHERS       = 1.
        IF sy-subrc NE 0.
          RAISE error.
        ENDIF.
        IF return = 'X'.
          guitype = 2.
        ENDIF.
      ENDIF.
      CASE guitype.
        WHEN 1.
          clsid = 'Sapgui.InfoCtrl.1'.
        WHEN 2.
          clsid = 'com.sap.components.controls.sapImage.SapImage'.
      ENDCASE.
    ENDIF.
    CALL METHOD super->constructor
      EXPORTING
        clsid      = clsid
        shellstyle = 0
        parent     = cl_gui_container=>default_screen
        autoalign = space
      EXCEPTIONS
        OTHERS     = 1.
    IF sy-subrc NE 0.
      RAISE error.
    ENDIF.
    CALL METHOD cl_gui_cfw=>subscribe
      EXPORTING
        shellid = h_control-shellid
        ref     = me
      EXCEPTIONS
        OTHERS = 1.
    IF sy-subrc NE 0.
      RAISE error.
    ENDIF.
* Register the events
    event_tab_line-eventid = lcl_gui_timer=>eventid_finished.
    APPEND event_tab_line TO event_tab.
    CALL METHOD set_registered_events
      EXPORTING
        events = event_tab.
ENDMETHOD.                    "constructor
METHOD cancel.
    CALL METHOD call_method
      EXPORTING
        method     = 'SetTimer'
        p_count    = 1
        p1         = -1
        queue_only = 'X'
      EXCEPTIONS
        OTHERS     = 1.
    IF sy-subrc NE 0.
      RAISE error.
    ENDIF.
ENDMETHOD.                    "cancel
METHOD run.
    CALL METHOD call_method
      EXPORTING
        method     = 'SetTimer'
        p_count    = 1
        p1         = interval
        queue_only = 'X'
      EXCEPTIONS
        OTHERS     = 1.
    IF sy-subrc NE 0.
      RAISE error.
    ENDIF.
ENDMETHOD.                    "run
METHOD dispatch .
    CASE eventid.
      WHEN eventid_finished.
        RAISE EVENT finished.
    ENDCASE.
ENDMETHOD.                    "dispatch
ENDCLASS.                    "lcl_gui_timer IMPLEMENTATION
Hope that's what you are looking for. I got the idea from a project where they used it to auto refresh an ALV grid...
You may also search this forum for keywords timer or autorefresh. It has been discussed here earlier.
Regards,
Clemens

Macbook misses some key events for a few seconds

I have noticed that for last two months or so something strange happens to my Retina MBP. Once in a couple of days it stops responding to some key events. It is like it handles only one keypress out of 4-5. Nothing seems to be wrong with the keyboard and it is not about a particular key or keys. And about 10-15 seconds later everything goes back to normal. I do not see any suspicious messages in the logs, the computer is connected to the power supply...It happens just by itself in the middle of the day, when I am typing.
Almost looks like some interrupts get lost by the system while it is busy with something else. But I have checked the load level and running processes - nothing interesting there....And whatever it is - it happens during a very short period of time.

Hi,
No, I have not returned my MBP yet. In fact, I would rather avoid doing this unless I am convinced if it is a hardware issue. And I do believe it is not. Just recently I have spent some time investigating it and I have found very stroing correlation between the moments when this happens and these messages in the kernel log:
Jan 13 10:49:54 mbp-wifi kernel[0]: Sandbox: sandboxd(96471) deny mach-lookup com.apple.coresymbolicationd
Jan 13 10:54:31 mbp-wifi kernel[0]: Sandbox: sandboxd(96499) deny mach-lookup com.apple.coresymbolicationd
Jan 13 10:54:31 mbp-wifi.home sandboxd[96499] ([96497]): mdworker(96497) deny mach-lookup com.apple.ls.boxd
Jan 13 10:54:31 mbp-wifi.home sandboxd[96499] ([96498]): mdworker(96498) deny mach-lookup com.apple.ls.boxd
Jan 13 10:56:32 mbp-wifi.home sandboxd[96504] ([96503]): mdworker(96503) deny mach-lookup com.apple.ls.boxd
Jan 13 10:56:32 mbp-wifi.home sandboxd[96504] ([96502]): mdworker(96502) deny mach-lookup com.apple.ls.boxd
And I have also noticed that my Spotlight database gets reconstructed too often, which means it gets corrupted.
From all this I conclude that it is most likely the software issue and it seems to be linked to spotlight. I saw people reporting similar things. So now I am researching on how to fix it without disabling the spotlight.
In general, I believe that the quality of Apple software is going down, it is not like 4-5 years ago And Apple does seem to care less and less about it.
If in your case it happens all the time, not just once in a while, and you see that a particular key has problems - it is possible that we are talking about the different issues and yours might be really about the keyboard.

Detect key events on anything

If I have a JFrame with many components on it, how do I detect if a key is pressed, without having to add a listener to every component? For example, how can I check for the escape key being pressed, but not having to have componentN.addKeyListener(this); for everything?
Thanks
US101

The correct way to collect the key events is the following:
from java 1.2 to java 1.3 use the FocusManager. This class can be found in the javax.swing package. You would then need to extend the DefaultFocusManager and override specific behavior.
for java 1.4 use the KeyBoardFocusManager. This class can be found in the java.awt package.
Please see the following for a better explanation:
http://java.sun.com/j2se/1.4/docs/api/java/awt/doc-files/FocusSpec.html
Thanks for your time,
Nate

Catching key events in application

I have a JFrame with a JDesktop containing lots of JInternalFrame with various of components such as JTextFields etc.
Now, i want to have a "main" listener that will catch key events no matter which component that has focus. For example pressing CTRL+A should produce something in the application no matter which component that has focus.
How do I implement this in an easy way?

It doesnt seem to work to add a KeyListener to the JFrame...
this.addKeyListener(new KeyAdapter(){
               public void keyTyped(KeyEvent e){
                    System.out.println("KeyTyped()");
               public void keyPressed(KeyEvent e){
                    System.out.println("KeyTyped()");
          });Adding that to the JFrame gives nothing to System.out when a JTextArea inside an JInternalFrame has focus.

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}

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()
}

No key event when compose keys are pressed

I am supporting a legacy application for Sabre which maps some of the keys differently. For example, on a French keyboard the Compose key which is used to put a ^ on top of the vowel characters is to be remapped to produce a special character called a "Change Character" that has a special use for reservation agents that use Sabre
The problem is, the first time you press the ^ compose key there is no key event apparently because the VM figures it doesn't yet know what key to report, it is expecting you to press a character such as 'o' and then you get an 'o' with a '^' on top of it.
If you press the ^ compose key a second time, you get the following key events:
keyPressed
keyTyped
keyTyped
keyReleased
On the screen you will see two ^ characters appear. Currently I remap the ^ character to the "Change Character", and I suppress the second keyTyped event so that I only get one character. The problem is that the user ends up having to press the key twice to get one "Change Character."
I have no fix for this problem because there is no key event produced when they press the ^ compose key the first time.
By the way, this behavior appears to have been introduced with jdk 1.3. The older jdk did produce a key event the first time you pressed the compose key. I would expect that this behavior was considered to be a bug and was fixed in jdk 1.3.
Is there some other way to detect when the user presses a compose key? If not, is it possible for future jdk releases to report a keyPressed event when a compose key is pressed? This event would not cause a character to appear on the screen, but would allow programs to detect when the compose key is pressed.
There is already a key on the French keyboard that behaves this way. It is the key to the left of the '1' key and it has the pipe symbol on it. If you press Shift plus this pipe key, no character is produces but a keyPressed event with a keycode of 222 is produced. I merely point this out to show that there is a way to report key events whithout producing output on the screen.
Thanks, Brian Bruderer

I don't know if this actually helps, but it seems that you can bind an Action to a dead key like the circumflex of the French keyboard
Keymap keymap = textPane.addKeymap("MyEmacsBindings", textPane.getKeymap());
Action action = getActionByName(DefaultEditorKit.beginAction );
KeyStroke key = KeyStroke.getKeyStroke(KeyEvent.VK_DEAD_CIRCUMFLEX);
keymap.addActionForKeyStroke(key, action);I saw this on a Swing tutorial and modified it slightly. Have a look at it :
http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html
Chris

Regarding key event

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