Java stops capturing mouse movements after maximizing or fully viewing a window in Mac OS X

Question

When I enlarge the window by pressing the maximize button or the full screen button on OS X, mouse movements are no longer captured (although drag and drop).

I have included a demo program below that highlights the issue. The maximization problem can be replicated using the MouseEventDemo web launch example in the Java Tutorials site .

After some troubleshooting, I noticed that mouse movements are selected if the mouse leaves the window (for example, moves to the top of the window to access the menu bar), and then returns. It seems that the problem may have something to do with the relationship between the position of the mouse and the window during the resizing of the animation, since the mouse is not in the frame before the resizing, but then, although it did not necessarily move in the process.

import java.awt.Window; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.lang.reflect.Method; import javax.swing.JFrame; import javax.swing.JLabel; public class Main implements MouseMotionListener { JLabel label = new JLabel("label"); public static void main(String[] args) { Main main = new Main(); main.init(); } public void init() { JFrame frame = new JFrame(); frame.setSize(640, 480); frame.setLocationRelativeTo(null); frame.getContentPane().add(label); frame.addMouseMotionListener(this); frame.setVisible(true); if (isMacOSX()) { enableFullScreenMode(frame); } } public void mouseDragged(MouseEvent e) { label.setText(e.toString()); } public void mouseMoved(MouseEvent e) { label.setText(e.toString()); } private static boolean isMacOSX() { return System.getProperty("os.name").indexOf("Mac OS X") >= 0; } public static void enableFullScreenMode(Window window) { try { Class<?> clazz = Class.forName("com.apple.eawt.FullScreenUtilities"); Method method = clazz.getMethod("setWindowCanFullScreen", new Class<?>[] { Window.class, boolean.class }); method.invoke(null, window, true); } catch (Throwable t) { t.printStackTrace(); } } } 

The execution of the above code should reveal when the label does and does not update.

I am running OS X Version 10.9 Build 13A3017 with Java SE 7 [1.7.0_45].

Answer 1

Oracle responded to the error report that I presented, noting in my comments that the problem should be resolved in Java 8. The code above works as expected on the 1.8.0 JRE (build 1.8.0-b132) using OS X 10.9.2 .

Answer 2

Empirically, the problem disappears if you disconnect and return to the application while it is maximizing. Adding a ComponentListener to make the toFront() frame work. Aside, Swing GUI objects should only be built and processed in the event dispatch thread .

 frame.addComponentListener(new ComponentAdapter() { @Override public void componentResized(ComponentEvent e) { frame.toFront(); } }); 

As tested:

 import java.awt.EventQueue; import java.awt.Window; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.lang.reflect.Method; import javax.swing.JFrame; import javax.swing.JLabel; /** @see http://stackoverflow.com/a/20054242/230513 */ public class Main implements MouseMotionListener { JLabel label = new JLabel("label"); public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { Main main = new Main(); main.init(); } }); } public void init() { final JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(label); frame.pack(); frame.setSize(640, 480); frame.setLocationRelativeTo(null); frame.setVisible(true); if (isMacOSX()) { enableFullScreenMode(frame); } frame.addMouseMotionListener(this); frame.addComponentListener(new ComponentAdapter() { @Override public void componentResized(ComponentEvent e) { frame.toFront(); } }); } @Override public void mouseDragged(MouseEvent e) { label.setText(e.toString()); } @Override public void mouseMoved(MouseEvent e) { label.setText(e.toString()); } private static boolean isMacOSX() { return System.getProperty("os.name").indexOf("Mac OS X") >= 0; } public static void enableFullScreenMode(Window window) { try { Class<?> clazz = Class.forName("com.apple.eawt.FullScreenUtilities"); Method method = clazz.getMethod("setWindowCanFullScreen", new Class<?>[]{Window.class, boolean.class}); method.invoke(null, window, true); } catch (Throwable t) { t.printStackTrace(); } } } 

Answer 3

I managed to find work with the maximum part of this problem by adding a windowStateListener to the frame and doing the following:

 frame.addWindowStateListener(new WindowStateListener() { @Override public void windowStateChanged(WindowEvent e) { if (Frame.MAXIMIZED_BOTH == e.getNewState()) { frame.toBack(); frame.toFront(); } } }); 

If you combine this with the resizing around the trashgod, you should be in good shape.

Answer 4

MouseReleased, mouseClicked events are not fired when jdk 1.6.0_65 (yosemite) is used, events are fired for jdk 1.8.0_25 (yosemite), and also that events were triggered on jdk 1.6 (maverick). What could be the problem?

java version java version "1.6.0_65" Java (TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716) Java HotSpot (TM) 64-bit server VM (build 20.65-b04-466.1, mixed mode )

windowActivated windowOpened mousePressed windowClosing windowDeactivated

java version "1.8.0_25" Java (TM) SE Runtime Environment (build 1.8.0_25-b17) Java HotSpot (TM) 64-bit server VM (build 25.25-b02, mixed mode)

windowActivated windowOpened mousePressed mouseReleased mouseClicked windowClosing windowDeactivated

import java.awt .; import java.awt.event .;

public class TestMouseEventsOnYosemite {

 public static void main(String[] args) { TestFrame testFrame = new TestFrame(); testFrame.setVisible(true); testFrame.toFront(); } public static class TestFrame extends Frame implements WindowListener { public TestFrame() { setLayout(null); addNotify(); Button okButon = new Button(" Ok "); add(okButon); okButon.addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent event) { System.out.println("mouseReleased"); } public void mousePressed(MouseEvent event) { System.out.println("mousePressed"); } public void mouseClicked(MouseEvent event) { System.out.println("mouseClicked"); } } ); okButon.addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent event) { System.out.println("keyPressed"); } } ); int dy = okButon.getPreferredSize().height; okButon.setBounds(30, 50, 100, dy); setSize(150, 150); addWindowListener(this); setResizable(true); okButon.requestFocusInWindow(); } public void windowActivated(WindowEvent e) { System.out.println("windowActivated"); } public void windowClosed(WindowEvent e) { System.out.println("windowClosed"); } public void windowDeactivated(WindowEvent e) { System.out.println("windowDeactivated"); } public void windowDeiconified(WindowEvent e) { System.out.println("windowDeiconified"); } public void windowIconified(WindowEvent e) { System.out.println("windowIconified"); } public void windowOpened(WindowEvent e) { System.out.println("windowOpened"); } public void windowClosing(WindowEvent e) { System.out.println("windowClosing"); } } 

}