//Recursively find the last child and separate it
public void Unpin()
{
ShapeGraphic tempChild = childShapeGraphic;
ShapeGraphic tempParent = parentShapeGraphic;
childShapeGraphic = new ShapeGraphic();
parentShapeGraphic = new ShapeGraphic();
childShapeGraphic = null;
parentShapeGraphic = null;
if (tempChild != null)
{
if (tempParent == null)
{
tempChild.removeParent();
}
else
{
tempChild.giveParent(tempParent);
}
}
if (tempParent != null)
{
if (tempChild == null)
{
tempParent.removeChild();
}
else
{
tempParent.giveChild(tempChild);
}
}
}
//Recursively find the child who doesn't have a child yet
public void Pin(ShapeGraphic childToPin)
{
if (childShapeGraphic == null)
{
//Find the highest parent in the child graphic
while (true)
{
if (childToPin.hasParent())
{
childToPin = childToPin.getParent();
}
else
{
break;
}
}
childShapeGraphic = childToPin;
childToPin.giveParent(this);
}
else
{
childShapeGraphic.Pin(childToPin);
}
}