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8200224: Multiple press event when JFXPanel gains focus

Reviewed-by: kcr, psadhukhan
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Florian Kirmaier authored and kevinrushforth committed Nov 27, 2019
1 parent 83eb0a7 commit 1d670f18d16d060dc40e83733cb3595c41df2a97
@@ -446,13 +446,11 @@ protected void processMouseEvent(MouseEvent e) {
(e.getButton() == MouseEvent.BUTTON1)) {
if (isFocusable() && !hasFocus()) {
// this focus request event goes to eventqueue and will be
// asynchronously handled so MOUSE_PRESSED event will not be
// honoured by FX immediately due to lack of focus in fx
// component. Fire the same MOUSE_PRESSED event after
// requestFocus() so that 2nd mouse press will be honoured
// since now fx have focus
jfxPanelIOP.postEvent(this, e);
// The extra simulated mouse pressed event is removed by making the JavaFX scene focused.
// It is safe, because in JavaFX only the method "setFocused(true)" is called,
// which doesn't have any side-effects when called multiple times.
int focusCause = AbstractEvents.FOCUSEVENT_ACTIVATED;
stagePeer.setFocused(true, focusCause);

@@ -0,0 +1,141 @@
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
* 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).
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* questions.
package test.javafx.embed.swing;

import com.sun.javafx.PlatformUtil;
import org.junit.Assume;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.AfterClass;
import org.junit.Test;
import junit.framework.AssertionFailedError;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.stage.Stage;
import javafx.scene.Group;
import javafx.scene.Scene;
import java.awt.Dimension;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class JFXPanelTest {
// Used to launch the application before running any test
private static final CountDownLatch launchLatch = new CountDownLatch(1);

// Application class. An instance is created and initialized before running
// the first test, and it lives through the execution of all tests.
public static class MyApp extends Application {
public void start(Stage primaryStage) throws Exception {


public static void doSetupOnce() throws Exception {
// Start the Application
new Thread(() -> Application.launch(MyApp.class, (String[]) null)).start();

if (!launchLatch.await(5000, TimeUnit.MILLISECONDS)) {
throw new AssertionFailedError("Timeout waiting for Application to launch");

Assert.assertEquals(0, launchLatch.getCount());

public static void doTeardownOnce() {

static class TestFXPanel extends JFXPanel {
protected void processMouseEventPublic(MouseEvent e) {

public void testNoDoubleClickOnFirstClick() throws Exception {

CountDownLatch firstPressedEventLatch = new CountDownLatch(1);

// It's an array, so we can mutate it inside of lambda statement
int[] pressedEventCounter = {0};

SwingUtilities.invokeLater(() -> {
TestFXPanel dummyFXPanel = new TestFXPanel();
dummyFXPanel.setPreferredSize(new Dimension(100, 100));
TestFXPanel fxPnl = new TestFXPanel();
fxPnl.setPreferredSize(new Dimension(100, 100));
JFrame jframe = new JFrame();
JPanel jpanel = new JPanel();

Platform.runLater(() -> {
Scene dummyScene = new Scene(new Group());
Scene scene = new Scene(new Group());

scene.addEventHandler(javafx.scene.input.MouseEvent.MOUSE_PRESSED, (event -> {
pressedEventCounter[0] += 1;

SwingUtilities.invokeLater(() -> {
MouseEvent e = new MouseEvent(fxPnl, MouseEvent.MOUSE_PRESSED, 0, MouseEvent.BUTTON1_DOWN_MASK,
5, 5, 1, false, MouseEvent.BUTTON1);


Assert.assertTrue(firstPressedEventLatch.await(5000, TimeUnit.MILLISECONDS));

Thread.sleep(500); // there should be no pressed event after the initial one. Let's wait for 0.5s and check again.

Assert.assertEquals(1, pressedEventCounter[0]);

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