identifying double click in java

java swing mouseevent double-click

70,112

Solution 1

public void mouseClicked(MouseEvent event)
{
  if (event.getClickCount() == 2 && event.getButton() == MouseEvent.BUTTON1) {
    System.out.println("double clicked");
  }
}

Solution 2

Assuming you mean in Swing, assign a MouseListener to your Component:

addMouseListener(new MouseAdapter(){
    @Override
    public void mouseClicked(MouseEvent e){
        if(e.getClickCount()==2){
            // your code here
        }
    }
});

Reference:

Java Tutorial: How to write a Mouse Listener

Solution 3

The e.getClickCount()==2 is not enough if you want to allow your users to do multiple double clicks in a short delay. You are limited by the desktop configuration. You can get it by looking the result of Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval");

A good way to bypass the problem is not to use the getClickCount() check but to use a Timer where you can choose the interval max between your clicks and to handle by oneself the count (very simple).

The code associated :

boolean isAlreadyOneClick;

@Override
public void mouseClicked(MouseEvent mouseEvent) {
    if (isAlreadyOneClick) {
        System.out.println("double click");
        isAlreadyOneClick = false;
    } else {
        isAlreadyOneClick = true;
        Timer t = new Timer("doubleclickTimer", false);
        t.schedule(new TimerTask() {

            @Override
            public void run() {
                isAlreadyOneClick = false;
            }
        }, 500);
    }
}

Tested with Win Xp OS and perfect.

70,112

Author by

Suraj Air

Updated on July 09, 2022

Comments

Suraj Air almost 2 years

I want to know how can we perform action when mouse is double clicked in a component.
Benj about 9 years

Intelligent use of a Timer to unset a flag, more complex than a comparison between two instants but easier to use. The drawback I see is : where to store the isAlreadyOneClick ? Seems to bring problems while solving one another. This solution will also have "holes" in its behavior if (let's imagine) the clicks are done very quickly : each time the Timer will reset the flag and only at this time, there will be a true double click handled. Also, I think this method isn't really GC and resources friendly.
davidxxx about 9 years

Hello Benj I don't manage to understand the relation between the Garbage Collector and the flag. Do you think that the way to proceed can break something ? Please, could you precise further your example and its consequences ? Sorry, I don't see what you try to show.
Benj about 9 years

There are two things I see : 1/ It's just that each time the "else" part will be run into, a new Timer object will be created. I would move this timer as a field of the object to allow managing it from other places such as right click or somewhat. 2/ These timers will be unflagging your double click each 500ms, then if you have to double click twice, there are chances for the last not to work as expected.
Benj about 9 years

It wasn't very clear, please excuse me :) But your code is correct if the user is not sneaky ;)
davidxxx about 9 years

@Benj, For the first remark, you are right. In practice, if relevant, it would be a good idea to use a single instance of the timer. And in a general way, use a single instance would be a good idea. We will not gain a lot of in performance but I agree because it's better to factorize the code when possible. For my part, I have not had this need in the part of my application. The fast double click handling was needed in a single use case. For the second remark, you can use any delay (500 or more like 1000 ms ). Anyway, thank you for this exchange (especially the first remark)
Benj about 9 years

You're welcome ! See you in another discussion, maybe.
Sean Van Gorder almost 7 years

You'll probably want to check event.getButton() == MouseEvent.BUTTON1 as well, to only count double-clicks with the left mouse button.
GhostCat almost 7 years

And do you belief this ... such a low quality question ... and still more upvotes than any of mine. hrmpf.
Marcono1234 almost 6 years

What about checking e.getClickCount() % 2 == 0 to detect multiple double clicks within "awt.multiClickInterval"?
Marcono1234 almost 6 years

@SeanVanGorder or SwingUtilities.isLeftMouseButton(event)