Java Utililty Methods Swing Focus

List of utility methods to do Swing Focus

  1. HOME
  2. Java
  3. S
  4. Swing Focus

Description

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

Method

ComponentfocusComponentOrChild(Component c)
Puts the focus on the first component in the tree of c that can accept the focus. 
return focusComponentOrChild(c, false);
ComponentfocusComponentOrChild(Component c, boolean deepest)
Puts the focus on the first component in the tree of c that can accept the focus. 
final Component focusable = getFocusableComponentOrChild(c, deepest);
if (focusable != null) {
    focusable.requestFocus();
return focusable;
booleanfocusFirstFocusableChild(Container c)
focus First Focusable Child 
int len = c.getComponentCount();
for (int i = 0; i < len; i++) {
    if (focusFirstFocusableComponent(c)) {
        return true;
return false;
booleanfocusFirstFocusableComponent(Component c)
focus First Focusable Component 
if (c == null) {
    return false;
if (c instanceof JComponent) {
    if (((JComponent) c).isRequestFocusEnabled() && c.requestFocusInWindow()) {
        return true;
if (c.isFocusable() && c.requestFocusInWindow()) {
    return true;
if (!(c instanceof Container)) {
    return false;
return focusFirstFocusableChild((Container) c);
voidfocusLater(final Component component)
focus Later 
SwingUtilities.invokeLater(new Runnable() {
    @Override
    public void run() {
        if (component instanceof JTextComponent) {
            ((JTextComponent) component).selectAll();
        component.requestFocusInWindow();
});
voidfocusLater(final Component component)
Focus a component. 
SwingUtilities.invokeLater(new Runnable() {
    @Override
    public void run() {
        if (component instanceof JTextComponent) {
            ((JTextComponent) component).selectAll();
        component.requestFocusInWindow();
});
voidfocusOnOpen(final JComponent component)
focus On Open 
component.addAncestorListener(new AncestorListener() {
    public void ancestorAdded(AncestorEvent event) {
        component.requestFocusInWindow();
        component.removeAncestorListener(this);
    public void ancestorRemoved(AncestorEvent event) {
    public void ancestorMoved(AncestorEvent event) {
...
ComponentgetFocusableComponentOrChild(Component c, boolean deepest)
Returns the first component in the tree of c that can accept the focus. 
if (c != null && c.isEnabled() && c.isVisible()) {
    if (c instanceof Container) {
        Container cont = (Container) c;
        if (deepest == false) { 
            if (c instanceof JComponent) {
                JComponent jc = (JComponent) c;
                if (jc.isRequestFocusEnabled()) {
                    return jc;
...
ComponentgetFocusableComponentOrChild(Component c, boolean deepest)
Returns the first component in the tree of c that can accept the focus. 
if (c != null && c.isEnabled() && c.isVisible()) {
    if (c instanceof Container) {
        Container cont = (Container) c;
        if (!deepest) { 
            if (c instanceof JComponent) {
                JComponent jc = (JComponent) c;
                if (jc.isRequestFocusEnabled()) {
                    return jc;
...
ComponentgetPermanentFocusOwner()
get Permanent Focus Owner 
return FocusManager.getCurrentManager().getPermanentFocusOwner();