Implementing a count-up timer

To implement a count-up timer, we will create two objects: a field to display the current timer and a button to start the upwards counting. We will code two handlers: one for the button and one for the timer.

How to do it...

Perform the following steps to implement a count-up timer:

1. Create a new main stack.
2. Place a field on the stack's card and name it timerDisplay.
3. Place a button on the stack's card and name it Count Up.
4. Add the following code to the Count Up button:

   on mouseUp
     local pTime
      
     put 0 into pTime
     put pTime into fld "timerDisplay"
     countUpTimer pTime
   end mouseUp

5. Add the following code to the Count Up button:

   on countUpTimer currentTimerValue
     add 1 to currentTimerValue
     put currentTimerValue into fld "timerDisplay"
     if currentTimerValue < 10 then 
       send "countUpTimer" && currentTimerValue to me 
         in 1 sec
     end if
   end countUpTimer

6. Test the code using a mobile simulator or an actual device...