Detect when key is being pressed then released

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Si - 28 Feb 2006 16:18 GMT

I use the code below to detect when a key is being pressed. Unfortunately it
only responds when the key is first pressed.

What I would like to do is detect when the key is initially pressed, and
when it is released.

How do I modify the code below to achieve this?

Thanks.

=============================

//below is in main application view constructor

contentPane.getInputMap(javax.swing.JComponent.WHEN_IN_FOCUSED_WINDOW).put(javax.swing.KeyStroke.getKeyStroke('a'),"a_pressed");
contentPane.getActionMap().put("a_pressed", new AbstractActionGB(gb));

//below is inner class in main application view

class AbstractActionGB extends javax.swing.AbstractAction {

model.GameBoard gb;

public AbstractActionGB(GameBoard gb) {
this.gb = gb;
}

public void actionPerformed(ActionEvent e)
{
System.out.println("A WAS PRESSED!!!");
gb.flipFlipper();
}
}

Reply to this Message

Rhino - 28 Feb 2006 18:02 GMT

>I use the code below to detect when a key is being pressed. Unfortunately
>it only responds when the key is first pressed.
[quoted text clipped - 29 lines]
> }
> }

See http://java.sun.com/docs/books/tutorial/uiswing/events/keylistener.html.

--
Rhino

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Vova Reznik - 28 Feb 2006 18:28 GMT

Yo may use method I wrote several years ago:

How to call:

registerKeyboardAction(c, actionForKeyRelease, KeyEvent.VK_A,
0, JComponent.WHEN_IN_FOCUSED_WINDOW, true);

registerKeyboardAction(c, actionForKeyPress, KeyEvent.VK_A,
0, JComponent.WHEN_IN_FOCUSED_WINDOW, false);

/**
    * @param component
    * @param action @see javax.swing.Action
    * @param keyCode @see java.awt.event.KeyEvent
    * @param modifier @see java.awt.event.InputEvent
* CTRL_MASK for example or 0 if no modifiers
    * @param focusModifier @see JComponent
    * @param onKeyRelease
    * @throws IllegalArgumentException
    */
public static void registerKeyboardAction(JComponent component,
            Action action, int keyCode, int modifier,
            int focusModifier, boolean onKeyRelease) throws
IllegalArgumentException {

InputMap inputMap = component.getInputMap(focusModifier);
ActionMap actionMap = component.getActionMap();
if (actionMap == null) {
    actionMap = new ActionMap();
    component.setActionMap(actionMap);
}

inputMap.put(KeyStroke.getKeyStroke(keyCode, modifier, onKeyRelease),
                action);
actionMap.put(action, action);
}

> I use the code below to detect when a key is being pressed. Unfortunately it
> only responds when the key is first pressed.
[quoted text clipped - 29 lines]
> }
> }

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Andrey Kuznetsov - 28 Feb 2006 19:27 GMT

>I use the code below to detect when a key is being pressed. Unfortunately
>it only responds when the key is first pressed.
[quoted text clipped - 3 lines]
>
> How do I modify the code below to achieve this?

use need KeyStroke.getKeyStroke(int keyCode, int modifiers, boolean
onKeyRelease)

Signature

Andrey Kuznetsov
http://uio.imagero.com Unified I/O for Java
http://reader.imagero.com Java image reader
http://jgui.imagero.com Java GUI components and utilities

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Detect when key is being pressed then released

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