Sparrow Forum

1. 

   rsmith86
   Member

   How do I make a touch event only fire when clicking down? Right now it fires when pressing and then it fires again when releasing. Any ideas?

   Posted 9 months ago #
2. 

   Daniel
   Primary Feather

   The event will always fire when a touch occurs, but you can then have a look at which "TouchPhase" the touch is in. That way, you can react to, say, only a touch-up event (TouchPhaseEnded).

   Here's a sample:
   http://wiki.sparrow-framework.org/manual/event_handling#touch_events

   Posted 9 months ago #
3. 

   rsmith86
   Member

   even using TouchPhaseEnded fires twice.

   Here is some of the code.

   [self addEventListener:@selector(onTouchEvent:) atObject:self forType:SP_EVENT_TYPE_TOUCH]; 
    
   -(void)onTouchEvent:(SPTouchEvent*)event
   {
       NSArray *touches = [[event touchesWithTarget:self andPhase:SPTouchPhaseEnded]
           allObjects];

   Posted 9 months ago #
4. 

   Daniel
   Primary Feather

   Are you absolutely sure this fires twice? Add a breakpoint to the line where you add the event listener, perhaps it's done twice?

   Posted 9 months ago #
5. 

   rsmith86
   Member

   I checked that. It only runs that line once. I am at a total loss. I have a textfield on the screen to count clicks and when I click down it adds 1 then when I release it adds another 1. I have no idea what to do.

   Posted 9 months ago #
6. 

   Daniel
   Primary Feather

   Wait a moment, I think you misunderstood something here. Check the following code:

   [self addEventListener:@selector(onTouchEvent:) atObject:self
                  forType:SP_EVENT_TYPE_TOUCH]; 
    
   -(void)onTouchEvent:(SPTouchEvent*)event
   {
       NSArray *touch = [[event touchesWithTarget:self andPhase:SPTouchPhaseEnded]
           anyObject];
    
       if (touch)
       {
          NSLog(@"a touch ended");
       }
   }

   So you've got to put youre code inside the "if (touch)" part. The event fires multiple times, but it will enter the if-clause only when the user removes the finger from the screen.

   Posted 9 months ago #
7. 

   rsmith86
   Member

   Oh my gosh, thanks! I can't believe I didn't catch that myself.

   Posted 9 months ago #
8. 

   Daniel
   Primary Feather

   You're welcome! =)

   I know this part is a little tricky, because it's different to how it's done in Flash. But it works fine once you're used to it!

   Posted 9 months ago #

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