CODEWITHSUNDEEP
javaswing
narzhan
narzhan

Reputation: 13

Add Enter key as JButton accelerator

I'm building simple chat application with simple GUI, but a I have a problem assigning Enter key to Send button. Right now it is quite unpractical pressing Alt+Enter. 

public void buildInterface() {
   //some other components
    btnSend = new JButton("Send");
    btnExit = new JButton("Exit");
    btnSearch=new JButton("Search");
    btnSend.setMnemonic(KeyEvent.VK_ENTER); 

     JPanel box=new JPanel();
     add(box, BorderLayout.SOUTH);
     box.add(tfInput);
     box.add(btnSend);
     box.add(btnExit);
     box.add(btnSearch);
}

Upvotes: 0

Views: 968

Answers (2)

Martin Leung
Martin Leung

Reputation: 99

Add following code to your Util class

public static void bindKeyStroke(final JButton btn, String ks) {
    final ActionListener[] alist = btn.getActionListeners();
    if (alist.length != 0) {
        AbstractAction action = new AbstractAction(btn.getText(), btn.getIcon()) {
            @Override
            public void actionPerformed(ActionEvent e) {
                for (ActionListener al : alist) {
                    ActionEvent ae = new ActionEvent(e.getSource(), e.getID(), Action.ACCELERATOR_KEY);
                    al.actionPerformed(ae);
                }
            }
        };

        KeyStroke keyStroke = KeyStroke.getKeyStroke(ks);
        btn.setAction(action);
        btn.getActionMap().put(Action.ACCELERATOR_KEY, action);
        btn.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyStroke, Action.ACCELERATOR_KEY);
    }
}

Goto frame, dialog or panel constructor and add after initComponent();

Util.bindKeyStroke(<your button>, "alt enter");

Fix double action, in action performed

if (evt.getActionCommand().equals(Action.ACCELERATOR_KEY)) {
    // Your send action here
}

Upvotes: 1

MadProgrammer
MadProgrammer

Reputation: 347214

When the button is focused, under most look and feels the Enter will activate the button.

You can, however, assign a button to be the "default" button for the window, which will be activated when the Enter key pressed, so long as the focused component does not consume it.

See How to Use Root Panes and JRootPane#setDefaultButton for more details

Upvotes: 1

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