Single Click Acts Like Double Click

A coworkers is having problems with his mouse (so I thought I'd post the problem, see if anyone knows what might be happening). He'll single click with his mouse, but sometimes (not always), it will act as though he's double clicked. Anyone have any suggestions as to what the problem might be?

He's got a dual 1.2 (I think) GHz G4 tower. He's using some third party mouse (with two buttons and a scroll wheel). He's running Panther (he might upgrade to Tiger today).
He (Brian, I'm gonna stop sayin' "he") ...Brian, switched with a "normal" Apple mouse for a few minutes and said it wasn't happening. But he can't get used to the big single click (which I prefer myself). Well, looks like we've found the culprit. I'll suggest changing USB ports, see if that does anything different.

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Edited by: SomasekharPatil on Mar 13, 2009 3:36 PM

Maybe something like the below example:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class SingleClickOnly {
    public static void main(String[] args) {
     SwingUtilities.invokeLater(new Runnable() {
         @Override
         public void run() {
          new SingleClickOnly().createGUI();
    public void createGUI() {
     JFrame frame = new JFrame();
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     JLabel label = new JLabel("Only acts on a single click");
     label.addMouseListener(createListener());
     frame.add(label);
     frame.pack();
     frame.setLocationRelativeTo(null);
     frame.setVisible(true);
    public MouseListener createListener() {
     return new MouseAdapter() {
         private int clickCount = 0;
         private final Timer timer = new Timer(1000, new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
              if (clickCount == 1) {
               System.out
                    .println("Executing action on click count 1 only");
          timer.setRepeats(false);
         @Override
         public void mouseClicked(MouseEvent event) {
          clickCount = event.getClickCount();
          System.out.println("Clicked: " + clickCount);
          if (clickCount == 1) {
              if (timer.isRunning()) {
               timer.stop();
              timer.start();
}Piet

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click
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mgushee wrote:
bernarcher wrote:Sounds like faulty hardware.
Did you try another mouse by chance?
Well, no, and I suppose to be thorough I should try that. But I am quite sure that the problem appeared suddenly, and exactly at the time of the upgrade I mentioned.
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Hi. I used an inner class. By using MouseAdapter u dont have to implement all methods in the interface..
MouseListener mouseListener = new MouseAdapter()
public void mouseClicked(MouseEvent e)
if(SwingUtilities.isLeftMouseButton(e))// if left mouse button
if (e.getClickCount() == 2) // if doubleclick
//do something
U also need to add mouselistener to the table:
table.addMouseListener(mouseListener);
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I did a search here and elsewhere on this and it seems to be a fairly common issue among G4 PowerBook users. These are the threads I found here on the subject just doing a quick search...
http://discussions.apple.com/thread.jspa?messageID=3875680&#3875680
http://discussions.apple.com/thread.jspa?messageID=1206577&#1206577
http://discussions.apple.com/thread.jspa?messageID=6951566&#6951566
http://discussions.apple.com/thread.jspa?messageID=4574012&#4574012
http://discussions.apple.com/thread.jspa?messageID=3359374&#3359374
http://discussions.apple.com/thread.jspa?messageID=3423942&#3423942
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The problem is that quite often when I single-click on something, whether in the Finder or an Application, it registers as a double-click. It doesn't matter if I use the trackpad or a mouse, same problem.
I've tried different "Keyboard and Mouse" settings in System Prefs and nothing makes any difference. I've tried the PMU reset too. No change. I've tried it with the mouse disconnected and I've tried it with two different mice. No improvement. I've even tried it with green eggs and ham but the problem persists!
I've never had this issue with ANY other Mac I currently own (3 others) or have owned in the past (many since 1985). My only speculation is that MAYBE the humidity/static in my environment has something to do with it. I've never noticed an exact correlation but it SEEMS that perhaps I may be having this problem more often when the climate is dry. Possible?
Has anyone found a definitive cause/solution for this issue? Thanks!
Mike

Glad that worked for you Sup3rL4m3r but I suspect we have different issues. I have no problems with anything except single-clicks and click-drags registering as double clicks with either the trackpad or mouse. I have no issues with my "wallpaper" or with erratic cursor issues, or with anything else. When I upgraded to Tiger as indicated in the original post, I did an archive and install but it did nothing to mitigate the problem.
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JeffOverton wrote:
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Ton
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Double Click / Single click problem

Recently i have been noticing when i single click, using either my magic mouse or trackpad i end up getting a double click, even when my double click is set to as slow as possible.
Is there anything that can be done to stop this, as this makes many of the menu's in photoshop un usable as well as the dashboard calculator :'(

My Mother-In-Laws computer (iMac 2GHz- Snow Leopard with current updates) is acting this way also. In her case, she had a Logictec wireless mouse hooked up with the receiver in the keyboard. She has noticed the single click as a double click in Mail and another program (can't remember the other). Suggested that she go back to the original apple mouse and see if it still acted the same way. I'm on the computer now and have been able to recreate the problem with the Apple mouse. Her mouse click setting was all the way to "low". Moved the setting to the middle and didn't see much of a difference. Maybe slightly more instances of double-clicks.
I have two other macs(my Mac Pro and another iMac) I use on a regular basis and have not seen this problem. But they are also behind on Snow Leopard OS updates. I'm guessing this is an internal problem Apple will have to fix.

Single Click Acts Like Double Click

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