On key pressed/down/on released but for Global #s?

Hi,

I've been stumped searching for an answer and it's been hard to even phrase the question but I think I've got it now.

I am trying to setup a state machine based on GlobalNumbers. It's easy enough to tell it when to switch from one to another but I'm wondering if there's a way to monitor not only when it's on and off but whenit switches on and off.

The best example is in the way Construct 2 monitors a keyboard. That I can watch for when it is first pressed, when it's on and when it's released:

<img src="https://dl.dropboxusercontent.com/u/1587144/Scirra/Keyboard.JPG" border="0" />

I'd like to set up this same behavior but with a variable, like below:

<img src="https://dl.dropboxusercontent.com/u/1587144/Scirra/Spacebar.JPG" border="0" />

I want to watch for when the Spacebar variable switches from 0 to 1, when it's on 1 (can do this already) and when it switches from 1 to 0.

Is this possible and if so, how?

Thanks in advance for any help.

<img src="https://dl.dropboxusercontent.com/u/8367729/construct/pics/triggerVarChanged.PNG" border="0" />

here's a simple solution

basicEventBasedStateMachine.capx

Awesome, thanks so much!