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key stroke time limit

Posted on 2004-09-17
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Last Modified: 2010-03-31
hi experts,

I need a bit of code for an if statement that waits for a key press for 5 seconds.. and if a key is not pressed in that time it does something

thanks
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Question by:Samooramad
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Accepted Solution

by:
objects earned 150 total points
Comment Utility
gui or non-gui?

if its a gui then use a thread to include a delay before adding your keylistener

new Thread(new Runnable()
{
   public void run()
   {
      try
      {
         Thread.sleep(5000);
      }
      catch (Exception ex)
      {}
      comp.addKeyListener(listener);
   }
});
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Author Comment

by:Samooramad
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>> gui or non-gui?

whats the difference?
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Author Comment

by:Samooramad
Comment Utility
i do use a key listner if thats what you mean
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Expert Comment

by:objects
Comment Utility
> i do use a key listner if thats what you mean

then delay adding it for 5 seconds
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by:Samooramad
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how do I do that?
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Expert Comment

by:objects
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the code i posted above is one way to achieve it, you could also use a Timer.
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Author Comment

by:Samooramad
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objects, does your code add the listner more than once?
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by:objects
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no, it just delays adding it for 5 seconds.
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Author Comment

by:Samooramad
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maybe I needed to be more clear..or Im not quite understanding this.
I want to add a keylistner to a component (thats done) then have the option of either pressing one key or pressing two.
so after the first key is pressed the program waits for 5 seconds and if another one hasnt been pressed then it is assumed that only one key was pressed and so on for other components. Does your code still apply to that?

sorry if I'm being a pain :)
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by:objects
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in that case store the time the first key is pressed, and compare the difference when the second key is pressed.
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Assisted Solution

by:nesnemis
nesnemis earned 100 total points
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Hi

First you add a keylistener to your textfield, then put the following code in keyPressed:
if(t != null && t.isAlive())
   t.stop();
t = new Thread(new WaitForFunction());
t.start();

the class WaitForFunction is:
class WaitForFunction implements Runnable
{
   public void run()
   {
      try
      {
         Thread.sleep(5000);
         //Put your function here
      }
      catch(Exception e)
      {}
   }
}

Hope this helps :-)
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by:nesnemis
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the variable t must, of course, be global...
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by:Samooramad
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how objects?
thanks newnemis :) I'm working on your code will let u know if I get it working or not
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Author Comment

by:Samooramad
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nesnemis, how do I declare t?
Thread t;   ??
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Expert Comment

by:DrWarezz
Comment Utility
Yes;  Thread t;
=)
[r.D]
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Author Comment

by:Samooramad
Comment Utility
how do you check if a key was pressed during the 5 seconds?
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Assisted Solution

by:DrWarezz
DrWarezz earned 100 total points
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>"I need a bit of code for an if statement that waits for a key press for 5 seconds.. and if a key is not pressed in that time it does something"

Perhaps try this:

public class TestClass {
    boolean bPressed = false;
    int iTimeout = 5;

    public static void main ( String [] args ) {
        Thread t = new Thread ( new KeyListenClass() );
        t.start();
       
        try { Thread.sleep( iTimeout*1000 ); } catch (Exception e) {}
       
        t.stop();
       
        if ( bPressed ) {
            // A key has been pressed, do whatever here.
        } else {
            // A key has NOT been pressed, do whatever here.
        }
    }
   
    public class KeyListenClass extends Thread {
        KeyListenClass() {}
        public void run () {
           
            // Add keylistener to textfield here.
            // If a key is pressed, set bPressed = true;
           
        }
    }
   
}

Obviously, that won't just work on its' own; you have to add the textfield, and everything else. But, there's the syntax, I hope it's what you're after. =)

Best of luck,
[r.D]
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Expert Comment

by:DrWarezz
Comment Utility
*woops, I think you need to declare the bPressed as public, like so:

public boolean bPressed = false;

=)
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Author Comment

by:Samooramad
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thanks everyone for the help
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Expert Comment

by:DrWarezz
Comment Utility
8-)  ThanQ
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