Qgraphicsitem parent/child paint problem.

[repka3]

Hi all,
Suppose to have 2 items derived from qgraphicsitem, container and object, and suppose to override the object mouseReleaseEvent.
I do this:

IamInaContainer=false;
if(!scene()->collidingItems(this).isEmpty()){
 
	QList<QGraphicsItem*> lista_Ogge=scene()->collidingItems(this);
	for(int u=0;u<lista_Ogge.size();u++){
 
		if((lista_Ogge.at(u))->type()==soa_container::Type){
			IamInaContainer=true;
			setParentItem(lista_Ogge.at(u));
			break;
		}
 
	}
}	
if(!IamInaContainer)setParentItem(0);

IamInaContainer=false;
if(!scene()->collidingItems(this).isEmpty()){
	
	QList<QGraphicsItem*> lista_Ogge=scene()->collidingItems(this);
	for(int u=0;u<lista_Ogge.size();u++){
	
		if((lista_Ogge.at(u))->type()==soa_container::Type){
			IamInaContainer=true;
			setParentItem(lista_Ogge.at(u));
			break;
		}

	}
}	
if(!IamInaContainer)setParentItem(0);

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everythings is good , i'm able to move the object inside a container and then if i move container the object is moved right.Also i can move the object away from the container and setparent(0) work fine.

The problem is the draw position. When i insert the object inside the container the object don't stay where i released the mouse button, but shift (apparently) by a random vector.
Also when i drag the object away from container (suppose to move the object 50 pixel away the container) the object, after release, is drawn somewhere in the scene.

Notice that if i comment out this line:

//setParentItem(lista_Ogge.at(u));

//setParentItem(lista_Ogge.at(u));

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Everythings is good about positioning, never got a random offset from release to draw point, but offcourse object is ever without parent.

I think i missing sometimes about child/parent position.
Thx in advice.

[wysota]

You need to calculate and set the new position of the item relative to the new parent's origin.