在输入字段中按Enter时，关闭自定义对话框

Question

I've designed (using the GUI designer within Netbeans) a small dialog with two radio buttons and a number spinner.

1. If I press Enter while the focus is on one of the radio buttons, the dialog correctly closes, but if the focus is on the spinner, I have to Tab away from it in order to use the Enter key.
   2. How do I instruct the dialog that Enter really means "accept and close"?
   3. Alternatively, how do I instruct (each) input field to relay an Enter to the "accept and close" handler?
   4. Similarly, how do I instruct the dialog that Esc really means "cancel and close" even when the focus is on the spinner (or other field)?

Answer 1

how do I instruct (each) input field to relay an Enter to the "accept and close" handler?

The easiest approach is to define a "default button" on the dialog. Then when Enter is pressed the default button will be activated. Check out Enter Key and Button for different ways to do this.

how do I instruct the dialog that Esc really means "cancel and close"

Use Key Bindings to invoke the Action of your Cancel button.

First you define an Action to be used by the button:

public class CancelAction extends AbstractAction
{
    public CancelAction()
    {
        super("Cancel");
        putValue( Action.MNEMONIC_KEY, new Integer(KeyEvent.VK_C) );
    }

    @Override
    public void actionPerformed(ActionEvent e)
    {
        Window window = KeyboardFocusManager.getCurrentKeyboardFocusManager().getActiveWindow();

        if (window != null)
        {
            WindowEvent windowClosing = new WindowEvent(window, WindowEvent.WINDOW_CLOSING);
            window.dispatchEvent(windowClosing);
        }
    }
}

Then you add the Action to the button so the user can use the mouse:

CancelAction cancelAction = new CancelAction();
cancelButton.setAction( cancelAction );
dialog.add(cancelButton);

Now you can use Key Bindings to bind the Escape key to the CancelAction so the user can use the keyboard:

KeyStroke escapeKeyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, false);
getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(escapeKeyStroke, "ESCAPE");
getRootPane().getActionMap().put("ESCAPE", cancelAction);

Answer 2

I suspect the reason I had problems is that a spinner is really a compound control , and the text (well, number) field is an component of that. So I needed to hook up the events to that subcomponent , rather than to the spinner itself:

// Make Ok/Cancel work when JSpinner has focus
    getSpinnerField(jSpinnerOffset).addActionListener(new java.awt.event.ActionListener() {
        @Override
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            doOk();
        }
    });

where "getSpinnerField()" is just a shorthand in a private method:

private JFormattedTextField getSpinnerField(JSpinner spinner) {
    return ((JSpinner.DefaultEditor) spinner.getEditor()).getTextField();
}

Doing this, the Esc key automagically becomes able to dismiss the dialog.