Which components catch a key-event?

Hello,
I've a question. I've a panel with severall sub-panels with textfield-editors. These have listeners to respond on a enter-key pressed event.
When I input an illegal value somewhere, I invoke a messagedialog with a warning message. The problem is that when I press enter , the oke-button of the messagepane has the focus, the enter-key pressed event is also caught by my first panel with all the editors and shows the same message dialog again. Kinda like a loop.
I thought that key-pressed event only where caught by the component/frame which has the focus, or am I wrong.
Can anyone help me out here?
Much Thanks
Hugo Hendriks

Normally an ActionListener is installed to an OK button, not a KeyListener. Check if you have implemented the same error handling in two places!
Generally you can "eat" key events by e.consume(), maybe this helps:
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
// ... do some error handling on ENTER
e.consume();
I think then the Frame GUI will no get the key event anymore. A modal JDialog has a local event queue (to be modal), but maybe it forwards events to the main queue ...

Similar Messages

Catch several key events

hi...how do i catch several keys events?
Example:
i have a menubar with a menuitem Pan and need to catch the keys UP,DOWN,RIGHT,LEFT.
I know how to catch one key using a menushortcut.
Thanks.

Like this :
menubaritem.addKeyListener(new KeyListener(){
   public void keyPressed(KeyEvent evt){
      int keyCode = evt.getKeyCode();
      switch(keyCode){
         case KeyEvent.VK_UP:
            //your code here...
            break;
         case KeyEvent.VK_DOWN:
            //your code here...
            break;
         case KeyEvent.VK_LEFT:
            //your code here
            break;
         case KeyEvent.VK_RIGHT:
            //your code here
            break;
   public void keyTyped(KeyEvent evt){}
   public void keyReleased(KeyEvent evt){}

Catch a key event in JFrame

hi,
i am coding a GUI application for some FSM(Finite State Machine) simulation purpose. the app can load the FSM and display it. i can selecte some part of FSM and using "delete" key to delete the selected states. i did register the KeyEventListener to the the JFrame. but when i try to press the "del" key the app doesn't do anything. after few tests, i think JFrame never listene to my key event. how can i make it possible to let the JFrame to listene to my "key event"?
Thanks~~~

Read this, it is very useful for things like this:
[url http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html]How to Use Key Bindings
In your case you can add a key binding to the frame's root pane, and bind the delete key to the action you want to perform.

JPanel key events blocked by JToolBar?

I have a JPanel that I'm drawing on, and the frame containing the panel also holds a JToolBar. The JPanel doesn't catch any KeyEvents, which I really would like to monitor.
I have overridden isFocusable() as suggested in another thread like so:
public boolean isFocusable()
return true;
}My JPanel still doesn't catch KeyEvents, unless I get rid of the JToolBar. It seems that the controls in the toolbar don't pass the focus on to the panel. How do I change this behavior, without removing the toolbar?

Found the answer elsewhere.
I now add a "requestFocus()" call in my mousePressed event handler, and the JPanel catches the key events again.

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.

Catching Alt Key Press with the Key Down Filter Event

I am writing an application that requires specific key combinations using ctrl, shift, and alt in addition to a function key (F1, F2, F3, etc). The application works great except for when I try to catch an alt key press. The alt key press does not seem to fire an event eventhough it is an option in the PlatMods cluster as well as the VKey enum. When I press the alt key when my application is running the cursor changes to a normal mouse pointer from the usual finger pointer and prevents any other key presses from going through (in addition to not firing an event itself).
I have tried completely removing the run-time menu, which doesn't seem to help. I currently discard all keys after I handle them in my event structure.
I really hope that the only solution isn't using a Windows DLL. Any suggestions or ideas at all would be greatly appreciated.
Thanks,
Ames

Hi Ames
As Kileen has said Khalid has already given you a good solution to detect the ALT key.
I have another approach that might let you stick to your event-driven approach. I suggest that you have another loop in your app that polls the keyboard using the Input Device utility vi's. When this poll loop sees an ALT + KEY combo it raises a dynamic user event and will be processed in your event structure. This means you can keep your key down filter event to process the CTRL + KEY and SHIFT + KEY events.
Example attached in 7.1
cheers
David
Attachments:
Catching Alt Key Press Poll with Events(151551).vi ‏89 KB

How to catch a key down event in TextEdit UI element ?

Is it possible for me to catch 'Enter' and 'Esc' key when I input something ?
Best regads ,

hi, Shishir ,
I see the on key event in input field , yes , the TextEdit does not has any event . But how can I meet such requirement ?
When the user click enter on TextEdit , I should do something , When the user click escape , I should do something ?
Best regards ,

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

Giving a JDialog a crack at every key event, before child components

Hello All!
I guess the subject line says it all :-)
I want a dialog to "see" (but not necessarily consume) all key events before it children.
Any help is greatly appreciated.
Robert.

in the dialog you add a method
All child components get a keylistener that first calls the dialogs method.

How to implement "ALT + some key" event ?

Hello,
I'd like JDialog to catch key events only when user holds ALT button and presses some regular key (e.g. A,B,C, etc...).
How this can be done ?
Thanks for any advice !

maybe you should use mnemonics?
i don't know what is it you want to do.
buti if you want for example to have JDialog, where are some buttons (OK & CANCEL) and want user to be able to click them by pressing ALT+O or ALT+C, then you might need to use mnemonics...
if you want to enable some new kind of copy/paste/whatever combinations, then you might want to use keybindings
http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html
or see tutorial about using menus, and the part there which tells about enabling key operations
http://java.sun.com/docs/books/tutorial/uiswing/components/menu.html#mnemonic
or be more specific about your problem... what and Why are you trying to do.

How to disable the F4 Key Event?

Hi Guys,
I have written my own FocusManager which allows me to traverse through disabled components. If a user presses the F4 key while the focus is in a disabled JComboBox, the popup becomes activated. Is there any way deactivate the F4 keystroke?
I have tried:
event.consume();
combobox.setPopupVisible(false);
combobox.hidePopup();
I also read that F4 is a low-level event maintained by Windows. Is this true? Is there no alternative?
-Sri :)

To anyone who may be interested:
I have tried all available solutions:
1. hidePopup()
2. setPopupVisible(false)
3. unregistering the F4 key event
4. catching the F4 key event and snubbing it
I have had no luck with the above solutions. It leads me to believe that F4 key is registered under the windows environment and it is a low-level event.
-Sri :)

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

Help with understanding key event propagation

Hello,
I am hoping someone can help me understand a few things which are not clear to me with respect to handling of key events by Swing components. My understanding is summarized as:
(1) Components have 3 input maps which map keys to actions
one for when they are the focused component
one for when they are an ancestor of the focused component
one for when they are in the same window as the focused component
(2) Components have a single action map which contains actions to be fired by key events
(3) Key events go to the currently focused component
(4) Key events are consumed by the first matching action that is found
(5) Key events are sent up the containment hierarchy up to the window (in which case components with a matching mapping in the WHEN_IN_FOCUSED_WINDOW map are searched for)
(6) The first matching action handles the event which does not propagate further
I have a test class (source below) and I obtained the following console output:
Printing keyboard map for Cancel button
Level 0
Key: pressed C
Key: released SPACE
Key: pressed SPACE
Level 1
Key: pressed SPACE
Key: released SPACE
Printing keyboard map for Save button
Level 0
Key: pressed SPACE
Key: released SPACE
Level 1
Key: pressed SPACE
Key: released SPACE
Printing keyboard map for Main panel
Event: cancel // typed SPACE with Cancel button having focus
Event: save // typed SPACE with Save button having focus
Event: panel // typed 'C' with panel having focus
Event: panel // typed 'C' with Cancel button having focus
Event: panel // typed 'C' with Save button having focus
I do not understand the following aspects of its behaviour (tested on MacOSX although I believe the behaviour is not platform dependent):
(1) I assume that the actions are mapped to SPACE since the spacebar clicks the focused component but I don't explicitly set it?
(2) assuming (1) is as I described why are there two mappings, one for key pressed and one for key released yet the 'C' key action only has a key pressed set?
(3) assuming (1) and (2) are true then why don't I get the action fired twice when I typed the spacebar, once when I pressed SPACE and again when I released SPACE?
(4) I read that adding a dummy action with the value "none" (i.e. the action is the string 'none') should hide the underlying mappings for the given key, 'C' the my example so why when I focus the Cancel button and press the 'C' key do I get a console message from the underlying panel action (the last but one line in the output)?
Any help appreciated. The source is:
import javax.swing.*;
public class FocusTest extends JFrame {
     public FocusTest ()     {
          initComponents();
          setTitle ("FocusTest");
          setLocationRelativeTo (null);
          setSize(325, 160);
          setVisible (true);
     public static void main (String[] args) {
          new FocusTest();
private void initComponents()
     JPanel panTop = new JPanel();
          panTop.setBackground (java.awt.Color.RED);
JLabel lblBanner = new javax.swing.JLabel ("PROPERTY TABLE");
lblBanner.setFont(new java.awt.Font ("Lucida Grande", 1, 14));
lblBanner.setHorizontalAlignment (javax.swing.SwingConstants.CENTER);
          panTop.add (lblBanner);
          JPanel panMain = new JPanel ();
          JLabel lblKey = new JLabel ("Key:");
          lblKey.setFocusable (true);
          JLabel lblValue = new JLabel ("Value:");
JTextField tfKey = new JTextField(20);
JTextField tfValue = new JTextField(20);
JButton btnCancel = new JButton (createAction("cancel"));     // Add a cancel action.
JButton btnSave = new JButton (createAction("save"));          // Add a sve action.
          panMain.add (lblKey);
          panMain.add (tfKey);
          panMain.add (lblValue);
          panMain.add (tfValue);
          panMain.add (btnCancel);
          panMain.add (btnSave);
          add (panTop, java.awt.BorderLayout.NORTH);
          add (panMain, java.awt.BorderLayout.CENTER);
setDefaultCloseOperation (javax.swing.WindowConstants.EXIT_ON_CLOSE);
// Add an action to the panel for the C key.
          panMain.getInputMap (JComponent.WHEN_IN_FOCUSED_WINDOW).put (KeyStroke.getKeyStroke (java.awt.event.KeyEvent.VK_C, 0), "panel");
          panMain.getActionMap ().put ("panel", createAction("panel"));
          // FAILS ???
          // Add an empty action to the Cancel button to block the underlying panel C key action.
btnCancel.getInputMap().put (KeyStroke.getKeyStroke (java.awt.event.KeyEvent.VK_C, 0), "none");
// Print out the input map contents for the Cancel and Save buttons.
System.out.println ("\nPrinting keyboard map for Cancel button");
printInputMaps (btnCancel);
System.out.println ("\nPrinting keyboard map for Save button");
printInputMaps (btnSave);
          // FAILS NullPointer because the map contents are null ???
System.out.println ("\nPrinting keyboard map for Main panel");
// printInputMaps (panMain);
private AbstractAction createAction (final String actionName) {
     return new AbstractAction (actionName) {
          public void actionPerformed (java.awt.event.ActionEvent evt) {
               System.out.println ("Event: " + actionName);
private void printInputMaps (JComponent comp) {
     InputMap map = comp.getInputMap();
     printInputMap (map, 0);
private void printInputMap (InputMap map, int level) {
     System.out.println ("Level " + level);
     InputMap parent = map.getParent();
     Object[] keys = map.allKeys();
     for (Object key : keys) {
          if (key.equals (parent)) {
               continue;
          System.out.println ("Key: " + key);
     if (parent != null) {
          level++;
          printInputMap (parent, level);
Thanks,
Tim Mowlem

Use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the posted code retains its original formatting.
1) In the Metal LAF the space bar activates the button. In the Windows LAF the Enter key is used to activate the button. Therefore these bindings are added by the LAF.
2) The pressed binding paints the button in its pressed state. The released binding paint the button in its normal state. Thats why the LAF adds two bindings.
In your case you only added a single binding.
3) The ActionEvent is only fired when the key is released. Same as a mouse click. You can hold the mouse down as long as you want and the ActionEvent isn't generated until you release the mouse. In fact, if you move the mouse off of the button before releasing the button, the ActionEvent isn't even fired at all. The mouse pressed/released my be generated by the same component.
4) Read (or reread) the [url http://java.sun.com/docs/books/tutorial/uiswing/misc/keybinding.html#howto]How to Remove Key Bindings section. "none" is only used to override the default action of a component, it does not prevent the key stroke from being passed on to its parent.

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.

Which components catch a key-event?

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