Re: How to detect double-click mouse events in Swing?

From:

"ducnbyu" <ducnbyu@aol.com>

Newsgroups:

comp.lang.java.gui

Date:

30 Jun 2006 10:34:08 -0700

Message-ID:

<1151688848.094659.133950@d30g2000cwa.googlegroups.com>

Wes Harrison wrote:

I think my understanding of mouse clicked events is wrong because I don't
get the behaviour I expect. When I implement the following code:

table.getTableHeader().addMouseListener(new MouseAdapter()
{
    public void mouseClicked(MouseEvent event)
    {
        System.out.println("Mouse event, clickCount = " +
event.getClickCount());
    }
}

I get the following output for every double-click:

Mouse event, clickCount = 1
Mouse event, clickCount = 2

Shouldn't it be just one event with a clickCount of 2? How can I tell the
difference between the first event and a normal single-click?

I am using Java 6.0 b89 but it probably applies to Java 5.0 and earlier as
well.

Thanks,

Wes

Have you considered SWT? It is able to implement a doubleClick method
since it uses OS specific libraries for UI. (Which makes it fast.)

Otherwise seems like a small reason to switch GUI's if you are taking
advantage of the richness of Swing.

An alternative would be to create a short duration javax.swing.timer
equal to a double click delay that you decide on (or let the user
configure separate from their OS value). On a first click of the mouse
event on the target widget start the timer. If a second mouse click
comes in on the same widget before the timer expires, stop the timer
and do your double click operation. If the timer expires before a
second mouse click, stop the timer and do your single click operation
(in the timer's ActionListener's actionPerformed method).