overridetab.html

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<TITLE>Moving the Focus with the TAB key in a JTextArea
(Java Developers Almanac Example)
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<h3>
    e895.  
    Moving the Focus with the TAB key in a JTextArea</h3>

By default, typing TAB in a <code>JTextArea</code> inserts a TAB character.
This example demonstrates how to modify the behavior so that
typing TAB moves the focus to the next focusable component.

<p></p> Rather than try to find the input map or keymap with the TAB
binding and remove it, it is better to add an overriding key binding
that will move the focus. The reason is that the location of the
default TAB binding might change in some future version.


<pre>
    JTextArea component = new JTextArea();
    
    /*
    // Add keystrokes
    component.getInputMap(JComponent.WHEN_FOCUSED).put(
        KeyStroke.getKeyStroke("pressed TAB"), nextFocusAction.getValue(Action.NAME));
    component.getInputMap(JComponent.WHEN_FOCUSED).put(
        KeyStroke.getKeyStroke("shift pressed TAB"), prevFocusAction.getValue(Action.NAME));
    */
    
    // Add actions
    component.getActionMap().put(nextFocusAction.getValue(Action.NAME), nextFocusAction);
    component.getActionMap().put(prevFocusAction.getValue(Action.NAME), prevFocusAction);
    
    // The actions
    public Action nextFocusAction = new AbstractAction("Move Focus Forwards") {
        public void actionPerformed(ActionEvent evt) {
            ((Component)evt.getSource()).transferFocus();
        }
    };
    public Action prevFocusAction = new AbstractAction("Move Focus Backwards") {
        public void actionPerformed(ActionEvent evt) {
            ((Component)evt.getSource()).transferFocusBackward();
        }
    };
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