Question

hi i’m using swing and in my main frame(JFrame) i want that when ever user press + key one window lets say test should appear.
my key listener works fine if i don’t call the show method of the newly added JInternalFrame but when i call the show method of my JInternalFrame the KeyListener stops listening any more.

i’ve tried a lot to solve it but all in vain so any help regarding this will be appreciated.
thanks.

this is my keyListener

_mainFrameKeyListener = new KeyListener()
    {
        public void keyPressed(KeyEvent arg0) {
            // TODO Auto-generated method stub
            System.out.println("the key pressed Id is : " + arg0.getKeyCode());

            if(arg0.getKeyCode() == 107){
                test Test = new test();
                _mainDesktopPane.add(Test);
                Test.show();

            }
        }
        public void keyReleased(KeyEvent arg0) {
            // TODO Auto-generated method stub
        }

        public void keyTyped(KeyEvent arg0) {
            // TODO Auto-generated method stub
        }           
};

Answer 1

Sounds like you want a hot key instead of a key listener to avoid focus issues.

// Get the KeyStroke for our hot key

KeyStroke plus = KeyStroke.getKeyStroke(KeyEvent.VK_PLUS, 0, true);

// Get the input map for our component
// In this case we are interested in key strokes in the focussed window

InputMap inputMap = panel.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);

// Map the key stroke to our "action key" (see below)

inputMap.put(plus, "my_action");

// Get the action map for our component

ActionMap actionMap = panel.getActionMap();

// Add the required action listener to out action map

actionMap.put("my_action", actionListener);

http://helpdesk.objects.com.au/java/how-to-specify-a-hot-key-for-a-swing-application