Example usage for java.awt FocusTraversalPolicy getDefaultComponent

Introduction

In this page you can find the example usage for java.awt FocusTraversalPolicy getDefaultComponent.

Prototype

public abstract Component getDefaultComponent(Container aContainer);

Source Link

Document

Returns the default Component to focus.

Usage

From source file:Main.java

public static Component findNextFocus() {
    Component c = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
    Container root = c.getFocusCycleRootAncestor();

    FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
    Component nextFocus = policy.getComponentAfter(root, c);
    if (nextFocus == null) {
        nextFocus = policy.getDefaultComponent(root);
    }/*from   w w  w.  ja  v a 2 s .c o m*/
    return nextFocus;
}

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From source file:Main.java

public static Component findPrevFocus() {
    Component c = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
    Container root = c.getFocusCycleRootAncestor();

    FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
    Component prevFocus = policy.getComponentBefore(root, c);
    if (prevFocus == null) {
        prevFocus = policy.getDefaultComponent(root);
    }/* w w  w .j  av a2 s.c  om*/
    return prevFocus;
}

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From source file:Main.java

public static Component compositeRequestFocus(Component component) {
    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();//from   ww  w.ja  va  2 s .  com
                return comp;
            }
        }
        Container rootAncestor = container.getFocusCycleRootAncestor();
        if (rootAncestor != null) {
            FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
            Component comp = policy.getComponentAfter(rootAncestor, container);

            if (comp != null && SwingUtilities.isDescendingFrom(comp, container)) {
                comp.requestFocus();
                return comp;
            }
        }
    }
    if (component.isFocusable()) {
        component.requestFocus();
        return component;
    }
    return null;
}

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From source file:Util.java

/**
 * Requests focus for a component. If that's not possible it's
 * {@link FocusTraversalPolicy}is checked. If that doesn't work all it's
 * children is recursively checked with this method.
 *
 * @param component the component to request focus for
 * @return the component which has focus or probably will obtain focus, null
 *         if no component will receive focus
 *//*from  w ww. j a  va2  s.  com*/
public static Component smartRequestFocus(Component component) {
    if (requestFocus(component))
        return component;

    if (component instanceof JComponent) {
        FocusTraversalPolicy policy = ((JComponent) component).getFocusTraversalPolicy();

        if (policy != null) {
            Component focusComponent = policy.getDefaultComponent((Container) component);

            if (focusComponent != null && requestFocus(focusComponent)) {
                return focusComponent;
            }
        }
    }

    if (component instanceof Container) {
        Component[] children = ((Container) component).getComponents();

        for (int i = 0; i < children.length; i++) {
            component = smartRequestFocus(children[i]);

            if (component != null)
                return component;
        }
    }

    return null;
}

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