2-State Button - Need Help

[jbum]

This one'll blow your mind. You can do the same thing in one line.

code:

---

isPaused = false;



this.movieClip.play_btn.onRelease =



function()

{

  gotoAndStop(5 - (isPaused ^= 1)*4);

}

---

I don't recommend this method, however, since it makes the code hard to understand.

Here's what is going on - I'll build it up bit by bit.

isPaused ^= 1;

This toggles the 1 bit in isPaused by using the XOR operator. The result is the new value of isPaused, which will be 0 or 1. So we get 0,1,0,1,0,1 etc.


(isPaused ^= 1)*4

We multiply that by 4, which gives us 0,4,0,4,0,4, etc.

5 - (isPaused ^= 1)*4

5-0 = 5
5-4 = 1

so this toggles back and forth between frame 5 and frame 1.

Now, here's a 2-line version which I would use. It uses the conditional operator ? :

code:

---

isPaused = !isPaused;

gotoAndStop(isPaused? 1 : 5);

---