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thunderxlight11111
thunderxlight11111
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the deffrent between children and visibles objects

Aug 14, 2012 2:09 AM

hi

i have problem here because iam confusing between these things , i know that visible property has to values true and false , and addchild is another thing because when you have two objects

then you put object 2 in object1 and i it will have its own x,y postion depend on that object , and object 1 is child for the main stage , but here is the problem

i.ve opened discuss before this

http://forums.adobe.com/message/4615780#4615780

 

and when i remove the child , its effect will be there ?? on the stage !! it is like hiding object

? so iam very confuse now , also if removechild doesn,t remove the object from existing then how can i remove it??

 

thank you and i hope you guys get what imean in my question

please check this link (my old discuss)

http://forums.adobe.com/message/4615780#4615780

 

thank you

851 Views   11 Replies   Latest reply: kglad, Aug 14, 2012 11:57 AM
 
Replies
  • kglad
    62,147 posts
    Jul 21, 2002
    Currently Being Moderated
    1. kglad,
    Aug 14, 2012 2:50 AM   in reply to thunderxlight11111
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    if you want to destroy a display object, remove it from the display list, remove all listeners and object references and null the object.  for example,

     

    bat1.parent.removeChild(bat1);  // if bat1 is in display list

    bat1.removeEventListener(Event.ENTER_FRAME,f);  // if this listener was previously added

    batArray.splice(batArray.indexOf(bat1),1);  // if bat1 is in the array batArray

    bat1=null;

     
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  • thunderxlight11111
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    2. thunderxlight11111,
    Aug 14, 2012 3:18 AM   in reply to kglad
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    thx , i did all these steps but in the bat still exist

     

    look

    1- remove it from display list

    in the main class

     

    if (hero.hitTestObject(portal3)){

          var map4:BACKGROUND = new BACKGROUND

          if(bat1.stage){

         removeChild(bat1)

         bat1.removeEventListener(Event.ENTER_FRAME, onEnterFrame);

         }

     

     

    2-remove it from the display list, remove all listeners and object references and null the object.

    in the bat1 class

     

    private function onRemovedFromStage(event:Event):void

      {

       removeEventListener(Event.ENTER_FRAME, onEnterFrame);

       removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);

       removeEventListener(Event.REMOVED_FROM_STAGE, onRemovedFromStage);

       null;

      

       trace("bat removed");

      }

     

    thank you

     
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  • kglad
    62,147 posts
    Jul 21, 2002
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    3. kglad,
    Aug 14, 2012 3:21 AM   in reply to thunderxlight11111
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    no, you didn't.  where is bat1=null??

     

    putting null; on a line by itself in your Bat1 class does nothing.

     
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  • thunderxlight11111
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    4. thunderxlight11111,
    Aug 14, 2012 3:35 AM   in reply to kglad
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    here

     

    if (hero.hitTestObject(portal3)){

          var map4:BACKGROUND = new BACKGROUND

          if(bat1.stage){

         removeChild(bat1)

         bat1 = null;

         bat1.removeEventListener(Event.ENTER_FRAME, onEnterFrame);

     

    but i get these thing after getting to the portal

     

    TypeError: Error #2007: Parameter hitTestObject must be non-null.

    at flash.display::DisplayObject/_hitTest()

    at flash.display::DisplayObject/hitTestObject()

    at MAIN/onEnterFrame()

     

    thank you for your replay

     
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  • kglad
    62,147 posts
    Jul 21, 2002
    Currently Being Moderated
    5. kglad,
    Aug 14, 2012 3:51 AM   in reply to thunderxlight11111
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    the last thing you do is null bat1:

     

     

     

    if (hero.hitTestObject(portal3)){

          var map4:BACKGROUND = new BACKGROUND();

          if(bat1){

         removeChild(bat1)

         bat1.removeEventListener(Event.ENTER_FRAME, onEnterFrame);  // this doesn't need to be done unless you added a listener outside the Bat1 classs

         bat1 = null;

     
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  • thunderxlight11111
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    6. thunderxlight11111,
    Aug 14, 2012 3:57 AM   in reply to kglad
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    i copied it then i paste in my code but the errors still!

     

    thank you again for your replay

     
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  • kglad
    62,147 posts
    Jul 21, 2002
    Currently Being Moderated
    7. kglad,
    Aug 14, 2012 4:02 AM   in reply to thunderxlight11111
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    that error is not from the code i suggested.  somewhere in your code you're trying to reference bat1 after it is nulled.

     

    use an if-statement to prevent that.

     

    if(bat1){

     

    }

     
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  • thunderxlight11111
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    8. thunderxlight11111,
    Aug 14, 2012 4:08 AM   in reply to kglad
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    maybe , am gonna delete all the classes and doing all the game in the main because i get enough of errors

    thank you alot kgald  but is if(bat1) mean that bat 1 on the stage  and if it is yes , what the deffrent between it andif(bat1.stage) because they look the same they both have to values true and false

    thx again

     
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  • kglad
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    Jul 21, 2002
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    9. kglad,
    Aug 14, 2012 7:45 AM   in reply to thunderxlight11111
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    if(bat1) means is bat1 not null.  ie, before you null bat1 the code within the if-statement (your hittest) will execute.  after you null bat1, that code will not execute and that will prevent the 2007 error.

     

    if(bat1.stage) checks if bat1 is in the display list.

     
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  • thunderxlight11111
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    10. thunderxlight11111,
    Aug 14, 2012 9:48 AM   in reply to kglad
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    thanks alot kgald

     
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  • kglad
    62,147 posts
    Jul 21, 2002
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    11. kglad,
    Aug 14, 2012 11:57 AM   in reply to thunderxlight11111
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    you're welcome.

     
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