Sparrow Forum

1. 

   Stylish
   Member

   Hello,

   I have a problem with the on touch event.

   My SPSprite is the parent of several SPImages and both the SPSprite and one SPImage responds to on touch event.

   At first everything is working right but, I don't know how, the SPImage stop responding to the touch event and the touch is detected by the parent istead the SPImage.

   It's normal? How can I avoid this behavior?

   Best regards

   Posted 1 year ago #
2. 

   Shilo
   Master Sparrow

   If you are using "event.target", try "event.currentTarget", or visa-versa. Sounds like you need "event.currentTarget".

   SPEvent.target: returns the object that dispatched the event.
   SPEvent.currentTarget: returns the object the event is currently bubbling at.

   Posted 1 year ago #
3. 

   Stylish
   Member

   I'm sorry. I made a mistake.

   The SPSprite and SPImage manages, each one, their own onTouch event.

   I'm not using event.target nor event.currentTarget.

   [code]
   - (void) onTouch: (SPTouchEvent*) event
   {

   SPTouch *drag = [[event touchesWithTarget:self andPhase:SPTouchPhaseMoved] anyObject];

   if(drag && isPlaying == YES)
   {
   float space = ([drag globalY]-[drag previousGlobalY]) * 0.13541667;
   [myCannon addRotation:SP_D2R(space)];
   }
   }

   Posted 1 year ago #
4. 

   Stylish
   Member

   Please, any help would be welcome

   Posted 1 year ago #
5. 

   Shilo
   Master Sparrow

   If you post or pm me your init method and event callback methods, I will have a closer look.

   Posted 1 year ago #
6. 

   Stylish
   Member

   PM sent shilo. Thanks a lot for your help

   Posted 1 year ago #
7. 

   Shilo
   Master Sparrow

   I didn't have any problem with the code you provided.

   I assume you are subclassing SPImage and adding the touch event listener in that subclass. If this is the case, maybe you have the addEventListener method in the wrong init method.

   Here is how I subclassed SPImage...

   ChildImage.m:

   #import "ChildImage.h"
    
   @implementation ChildImage
   - (id)initWithTexture:(SPTexture*)texture;
   {
   	if (self = [super initWithTexture:texture]) {
   		[self addEventListener:@selector(onTouch:) atObject:self forType:SP_EVENT_TYPE_TOUCH];
   	}
   	return self;
   }
    
   - (void) onTouch: (SPTouchEvent*) event
   {
   	if ([[self.parent valueForKey:@"isPlaying"] boolValue] == YES)
   	{
   		SPTouch *drag = [[event touchesWithTarget:self andPhase:SPTouchPhaseMoved] anyObject];
    
   		if(drag)
   		{
   			NSLog(@"[ChildImage class] dragging...");
   			if ([drag globalX] < 10+35)
   			{
   				self.x = 10 + 35;
   			}
   			else if ([drag globalX] > 310-35)
   			{
   				self.x = 310 - 35;
   			}
   			else
   			{
   				self.x = [drag globalX];
   			}
    
   		}
   	}
   }
   @end

   You can download the complete sample project here: http://cl.ly/6Wj5

   If you are doing something different then my approach, please explain further.

   Posted 1 year ago #
8. 

   Stylish
   Member

   Hello Shilo,

   I'm looking the code and the only difference is that I'm not subclassing a SPImage, but a SPSprite. It makes any difference?

   Best regards,

   Posted 1 year ago #

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