slide or swipe event

Excelcius

Hi All Im trying to implement a touch slide event Ive created a few classes before including a slider a scene slide transition and a scrolling text box but I haven't used slide gestures for a while and now I need to implement some more objects which require a slide action. However its getting to be a bit of a chore creating global variables in the class that uses the slide gesture and retyping the code on a class by class basis, So I want to implement a single event which has the basic information I need, without having to do it over and over again, but I am unsure how best to proceed.

Basically I want a touch event with globalX, tap count, touch phase ect but with the following additional properties

FirstTouchX, FirstTouchY, slideDirection, firstSlideDirection, slideDistance, slideDistanceX, slideDistanceY, slideSpeed, slideSpeedx, slideSpeedY, slideAngle and for a little bit of convenience perhaps localX and localY.
I don't want to modify the sparrow source code if possible, I did think of catching the standard SPTouch event in my main class and then re dispatching my new event but obviously this would be caught by all classes which implemented the listener and not just the specific object which was touched, and it would feel a little hacky, so Im currently left scratching my head as to how to implement it anybody have any ideas

Thanks in advance 🙂

Daniel

You could create a utility method that adds a touch event handler to an arbitrary Sparrow display object. That method executes all the logic that's necessary to detect the slide or swipe, and then dispatches a new event on that object, or a couple (SWIPE_START, SWIPE_MOVE, SWIPE_END).

The display object could then listen for those events, and react accordingly.

The method would be set up like this:

+ (void)addSwipeHandlerTo:(SPDisplayObject *)object
{
    [object addEventListenerForType:@"eventType" block:^(SPTouchEvent *event)
     {
         // add swipe detection logic here
         BOOL isSwipe = ....;

         if (isSwipe)
             [object dispatchEventWith:EVENT_TYPE_SWIPE];
     }];
}

An object would use it like this:

[MyUtils addSwipeHandlerTo:object];
[object addEventListenerForType:EVENT_TYPE_SWIPE block:^(SPEvent *event)
 {
    // do something
 }];

Is that something you could work with?

Excelcius

Hi Daniel apologies for the late reply thank you for your help I think Ive found a solution to my problem Ive created a static class, not sure wether static is the correct terminology in objective c, but that is to say a class with only class methods and static variables and pass the touch event to that when a listener is called.

- (void) onTouch:(SPTouchEvent*)touchEvent
{
    [QPTouch updateTouch:touchEvent atObject:self];

    if([QPTouch initialSwipeDirection] == QP_SWIPE_UP)
   {
       //do something
   }
}

The updateTouch method processes all the variables such as slideDirection, slideAngle, slideDistance, initialTouchX and initialTouchY ect and stores them, which can then be accessed as properties of QPTouch. I have a timeStamp check to make sure the method isn't invoked multiple times. I would like to share it with the community but it isn't fully tested yet and Im a bit snowed under, but it seems to be the cleanest solution 🙂