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Java detects long mouse press

Is there a way to capture the event if the user clicks on the JList component for more than 3 seconds?

The tricky part I find is that this event has to fire even before the user releases the left mouse button. (which is easy to do with the mousePressed and mouseReleased pair)

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5 answers


You can set a timer in your mouseDown event listener and execute it every 500ms after an initial delay of 3000ms. In your mouse, you can override this timer. In the run method of the object TimerTask

associated with yours Timer

, you can perform the computation of the required task. Here is my solution:



import javax.swing.*;
import java.awt.event.*;
import java.util.*;

public class Test
{
    public static void main(String[] args)
    {
        final JFrame f = new JFrame();
        String[] data = {"one", "two", "three", "four"};
        JList myList = new JList(data);
        f.add(myList);
        myList.addMouseListener(
            new MouseAdapter()
            {
                private java.util.Timer t;
                public void mousePressed(MouseEvent e)
                {
                    if(t == null)
                    {
                        t = new java.util.Timer();
                    }
                    t.schedule(new TimerTask()
                    {
                        public void run()
                        {
                            System.out.println("My importan task goes here");
                        }
                    },3000,500);
                }

                public void mouseReleased(MouseEvent e)
                {
                    if(t != null)
                    {
                        t.cancel();
                        t = null;
                    }
                }
            }
            );
            f.pack();
            SwingUtilities.invokeLater(new Runnable()
            {
                public void run()
                {
                    f.setVisible(true);
                }
            }
        );
    }
}
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Here's what I use for situations like this:

public class Player implements Runnable, MouseListener
{
    public void mousePressed(MouseEvent e)
    {
        holding = true;
        thread = new Thread(this);
        thread.start();
    }

    public void mouseReleased(MouseEvent e)
    {
        holding = false;
        System.out.println("Held for: "+seconds);
    }
    public void mouseClicked(MouseEvent e){}

    public void run()
    {
        try
        {
            while(holding)
            {
                seconds++;
                // put some code here
                if(seconds==3)
                {
                    holding = false;
                    System.out.println("Held for maximum time!");
                }
            }
        }catch(Exception e){e.printStackTrace();}

    private boolean holding;
    private int seconds;
    private Thread thread;
}


add this to your JLabel by calling label.addMouseListener (new Player ());

+3


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Two different solutions (almost the same as the previous ones):

    new MouseAdapter() {
        Date pressedTime;
        long timeClicked;

        @Override
        public void mousePressed(MouseEvent e) {
            pressedTime = new Date();
        }
        @Override
        public void mouseReleased(MouseEvent e) {
            timeClicked = new Date().getTime() - pressedTime.getTime();
            if (timeClicked >= 3000) {
                // DO YOUR ACTION HERE
            }
        }
    };

or

new MouseAdapter() {
    boolean mousePressed = false;

    @Override
    public void mousePressed(MouseEvent e) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                mousePressed = true;
                while (mousePressed) {
                    try {
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    if (mousePressed) {
                        // DO YOUR ACTION HERE
                    }
                }
            }
        }).start();
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        mousePressed = false;
    }
}
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I have an idea. It's not really a listener, but what you can do is on mousePressed

, you can start a timer. When the timer reaches 3 seconds, your event will start or if it is released, the mouseReleased

timer will stop.

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With this code, you can detect and control a long press or a short press (like a click), one event excludes the other.

private int pressStatus = 0; // TO DETECT IF LONG IS REAL LONG OR SHORT PRESSED
private Timer t;

...

@Override
public void mousePressed(final MouseEvent arg0) {
    pressStatus = 0; // to manage simple click or long

    if (t == null) {
        t = new Timer();
    }
    t.schedule(new TimerTask() {
        public void run() {
            pressStatus = 1;

            if (t != null) {
                t.cancel();
                t = null;
            }

            // PRESSED LONG
            int modifiers = arg0.getModifiers();
            if ((modifiers & InputEvent.BUTTON3_MASK) == InputEvent.BUTTON3_MASK) {
                ...
            } else if ((modifiers & InputEvent.BUTTON1_MASK) == InputEvent.BUTTON1_MASK) {
                ....
            }
        }
    }, 700, 1);
}

@Override
public void mouseReleased(MouseEvent arg0) {
    if (t != null) {
        t.cancel();
        t = null;
    }

    // PRESSED SHORT LIKE CLICK
    if (pressStatus == 0) {
        int modifiers = arg0.getModifiers();
        if ((modifiers & InputEvent.BUTTON3_MASK) == InputEvent.BUTTON3_MASK) {
            ...
        } else if ((modifiers & InputEvent.BUTTON1_MASK) == InputEvent.BUTTON1_MASK) {
            ...
        }
    }

    pressStatus = 0;
}
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