Java example source code file (RequestFocusAndHideTest.java)

This example Java source code file (RequestFocusAndHideTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, button, component, flowlayout, frame, interruptedexception, keyboardfocusmanager, requestfocusandhidetest, robot, runnable, runtimeexception

The RequestFocusAndHideTest.java Java example source code

/*
 * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
  @test
  @bug       6562853 6562853 6562853
  @summary   Tests that focus can not be set to removed component.
  @author    Oleg Sukhodolsky: area=awt.focus
  @library   ../../regtesthelpers
  @build     Util
  @run       main RequestFocusAndHideTest
*/

import java.awt.Button;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.KeyboardFocusManager;
import java.awt.Robot;

import test.java.awt.regtesthelpers.Util;

public class RequestFocusAndHideTest {
    public static void main(String[] args) throws InterruptedException, java.lang.reflect.InvocationTargetException
    {
        final Frame frame = new Frame("the test");
        frame.setLayout(new FlowLayout());
        final Button btn1 = new Button("button 1");
        frame.add(btn1);
        frame.add(new Button("button 2"));
        frame.add(new Button("button 3"));
        frame.pack();
        frame.setVisible(true);

        Robot r = Util.createRobot();
        Util.waitForIdle(r);
        Util.clickOnComp(btn1, r);
        Util.waitForIdle(r);
        KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
        if (kfm.getFocusOwner() != btn1) {
            throw new RuntimeException("test error: can not set focus on " + btn1 + ".");
        }

        EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    final int n_comps = frame.getComponentCount();
                    for (int i = 0; i < n_comps; ++i) {
                        frame.getComponent(i).setVisible(false);
                    }
                }
            });
        Util.waitForIdle(r);
        final Component focus_owner = kfm.getFocusOwner();

        if (focus_owner != null && !focus_owner.isVisible()) {
            throw new RuntimeException("we have invisible focus owner");
        }
        System.out.println("test passed");
        frame.dispose();
    }
}