CODEWITHSUNDEEP
javaevent-handlingactionkeylistenerkeyboard-events
Rezkin
Rezkin

Reputation: 459

Java KeyBind-Determining a Key Released Event

Short Version: How do I determine when a KeyBind key has been released in similar functionality to a KeyListener keyReleased() event?

Long Version: I am experimenting a bit with making a very simple game, and I was using several KeyListeners to track my keyboard input. However, as I added more complicated features, I began to encounter issues with the keyboard input not receiving proper focus and thus no keyboard input was being received.

Then I read about KeyBinds. While the KeyBinds functionality fixed my focus issue, for my game I was wanting to change a value based off whether a key was pressed or not. I can get the value to change through pressing the key, but I don't know how to detect when the key is released. The KeyListener had a separate KeyPressed and KeyReleased method, but that won't work correctly due to component focusing issues.

Relevant Code: I don't have a lot of code to share because the input was simply needed to call one of two methods which are set up in another class (and I was testing KeyBinds). But here is the relevant KeyBind code anyway:

    Action myAction = new AbstractAction()
    {

        @Override
        public void actionPerformed(ActionEvent e) 
        {
            System.out.println("testing action output");

        }

    };
    actionMap = getActionMap();
    inputMap = getInputMap(condition);

    inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "leftArrow");
    actionMap.put("leftArrow", myAction);

And here's the code I was using with KeyListener (again, very little since I just call a method)

addKeyListener(new KeyListener()
        {
            @Override
            public void keyPressed(KeyEvent e) 
            {
                racquetClass.keyPressed(e);
            }
            @Override
            public void keyReleased(KeyEvent e) 
            {
                racquetClass.keyReleased(e);
            }
            @Override
            public void keyTyped(KeyEvent e) 
            {

            }
        });

Thanks in advance to any and all help that can be provided.

Upvotes: 2

Views: 491

Answers (1)

camickr
camickr

Reputation: 324147

but I don't know how to detect when the key is released.

You need to create a separate Key Binding:

inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0, true), "leftArrowReleased");
actionMap.put("leftArrowReleased", myReleasedAction);

Upvotes: 3

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