Java Utililty Methods Swing Focus

List of utility methods to do Swing Focus

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Description

The list of methods to do Swing Focus are organized into topic(s).

Method

voidaddDefaultFocus(Window window, final JComponent component)
add Default Focus 
window.addWindowFocusListener(new WindowAdapter() {
    @Override
    public void windowGainedFocus(WindowEvent e) {
        component.requestFocusInWindow();
});
voidadjustFocus(JComponent c)
Request focus on the given component if it doesn't already have it and isRequestFocusEnabled() returns true. 
if (!c.hasFocus() && c.isRequestFocusEnabled()) {
    c.requestFocus();
voidcentreInFocusedWindow(Window window, int xOffset, int yOffset)
centre In Focused Window 
Window focusedWindow = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusedWindow();
centreInContainer(focusedWindow, window, xOffset, yOffset);
voidcheckComponentsFocusable(final Component _rootComponent)
Check the components. 
if (_rootComponent.isFocusable()) {
    System.out.println(
            "Focusable: \t" + _rootComponent.getClass().getSimpleName() + _rootComponent.getSize());
if (_rootComponent instanceof JPanel) {
    for (Component x : ((JPanel) _rootComponent).getComponents()) {
        checkComponentsFocusable(x);
} else if (_rootComponent instanceof JFrame) {
    for (Component x : ((JFrame) _rootComponent).getContentPane().getComponents()) {
        checkComponentsFocusable(x);
} else if (_rootComponent instanceof Panel) {
    for (Component x : ((Panel) _rootComponent).getComponents()) {
        checkComponentsFocusable(x);
} else if (_rootComponent instanceof Window) {
    for (Component x : ((Window) _rootComponent).getComponents()) {
        checkComponentsFocusable(x);
voidclearAWTFocus(Robot robot)
clear AWT Focus 
if (null == robot) {
    robot = new Robot();
    robot.setAutoWaitForIdle(true);
javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
    public void run() {
        System.err.println("******** clearAWTFocus.0");
        java.awt.KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwner();
...
ComponentcompositeRequestFocus(Component component)
composite Request Focus 
if (component instanceof Container) {
    Container container = (Container) component;
    if (container.isFocusCycleRoot()) {
        FocusTraversalPolicy policy = container.getFocusTraversalPolicy();
        Component comp = policy.getDefaultComponent(container);
        if (comp != null) {
            comp.requestFocus();
            return comp;
...
booleancontainerContainsFocus(Container cont)
containerContainsFocus, does the specified container contain the current focusOwner? 
Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
Component permFocusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getPermanentFocusOwner();
boolean focusOwned;
focusOwned = ((focusOwner != null) && SwingUtilities.isDescendingFrom(focusOwner, cont));
if (!focusOwned) {
    focusOwned = ((permFocusOwner != null) && SwingUtilities.isDescendingFrom(permFocusOwner, cont));
return focusOwned;
...
booleancontainerContainsFocus(Container cont)
container Contains Focus 
Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
Component permFocusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager()
        .getPermanentFocusOwner();
boolean focusOwned = (focusOwner != null) && (SwingUtilities.isDescendingFrom(focusOwner, cont));
if (!focusOwned) {
    focusOwned = (permFocusOwner != null)
            && (SwingUtilities.isDescendingFrom(permFocusOwner, cont));
return focusOwned;
FocusAdaptercreateWizardFocusAdapter()
create Wizard Focus Adapter 
return new FocusAdapter() {
    @Override
    public void focusGained(FocusEvent e) {
        if (e.getSource() instanceof JTextComponent) {
            JTextComponent tf = (JTextComponent) e.getSource();
            tf.setSelectionStart(0);
            tf.setSelectionEnd(tf.getText().length());
};
booleanfocusComponent(Component comp)
Tries to focus the given component. 
if (comp == null) {
    return false;
if (comp.isFocusable() && !(comp instanceof JScrollPane)) {
    comp.requestFocus();
    return true;
if (comp instanceof Container) {
...