test/jdk/java/awt/event/ComponentEvent/ComponentResizedTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
  @test
  @bug 4267393
  @summary Ensures minimal amount of paints
  @key headful
  @run main ComponentResizedTest
*/

import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.ComponentEvent;
import java.lang.reflect.InvocationTargetException;

public class ComponentResizedTest extends Frame {
    volatile int paintCount = 0;

    public static void main(String[] args) throws InterruptedException,
            InvocationTargetException {
        ComponentResizedTest componentResizedTest = new ComponentResizedTest();
        EventQueue.invokeAndWait(componentResizedTest::init);
        componentResizedTest.start();
        if (componentResizedTest != null) EventQueue.invokeAndWait(()
                -> componentResizedTest.dispose());
    }

    public void paint(Graphics g) {
        System.out.println("Paint called");
        ++paintCount;
    }

    public void init() {
        setTitle("ComponentResizedTest");
        setSize(100, 100);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void start () throws InterruptedException {
        Thread.sleep(1000);

        paintCount = 0;
        dispatchEvent(new ComponentEvent(this, ComponentEvent.COMPONENT_RESIZED));

        Thread.sleep(1000);

        if (paintCount > 0) {
            throw new RuntimeException("ComponentResizedTest failed. " +
                    "Paint called.");
        }
    }
}