Example usage for java.awt FocusTraversalPolicy getFirstComponent

Introduction

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

Prototype

public abstract Component getFirstComponent(Container aContainer);

Source Link

Document

Returns the first Component in the traversal cycle.

Usage

From source file:Main.java

/**
 * Returns first focusable component found in the container.
 *
 * @param container container to process
 * @return first focusable component found in the container
 *//*from  w  ww  .  j  a  v a  2  s.co m*/
public static Component findFocusableComponent(final Container container) {
    final FocusTraversalPolicy focusTraversalPolicy = container.getFocusTraversalPolicy();
    if (focusTraversalPolicy != null) {
        return focusTraversalPolicy.getFirstComponent(container);
    } else {
        for (final Component component : container.getComponents()) {
            if (component.isFocusable()) {
                return component;
            }
            if (component instanceof Container) {
                final Component focusable = findFocusableComponent((Container) component);
                if (focusable != null) {
                    return focusable;
                }
            }
        }
        return null;
    }
}

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From source file:org.jdal.swing.form.FormFocusTransversalPolicy.java

@Override
public Component getComponentAfter(Container container, Component component) {

    // Fix awt bug looking for ComboBoxEditor instead ComboBox
    // see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6205817
    if (component.getParent() instanceof JComboBox)
        component = component.getParent();

    int index = components.indexOf(component);

    if (index == -1) { // not owner
        Container childContainer = getTopmostProvider(container, component);
        if (childContainer == null)
            return getFirstComponent(container);

        FocusTraversalPolicy ftp = childContainer.getFocusTraversalPolicy();
        if (ftp != null && ftp != this) {
            Component next = ftp.getComponentAfter(childContainer, component);
            if (next != ftp.getFirstComponent(container))
                return next;

            // child cycle
            do {//  ww  w .  j  a  v a 2  s. co m
                index = components.indexOf(childContainer);
                childContainer = childContainer.getParent();
            } while (index == -1 || childContainer == null);

            if (index == -1) {
                log.warn("I can't figure what is the next component");
                return getFirstComponent(container);
            }
        }
    }

    index++;

    if (index < components.size() && index >= 0) {
        Component c = getComponent(index);
        if (c.isEnabled() && c.isFocusable())
            return c;
        else
            return getComponentAfter(container, c);
    }

    return getFirstComponent(container);
}

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