Function addChild

JUCE/modules/juce_data_structures/values/juce_ValueTree.cpp:247–286

    }

    void addChild (SharedObject* child, int index, UndoManager* undoManager)
    {
        if (child != nullptr && child->parent != this)
        {
            if (child != this && ! isAChildOf (child))
            {
                // You should always make sure that a child is removed from its previous parent before
                // adding it somewhere else - otherwise, it's ambiguous as to whether a different
                // undomanager should be used when removing it from its current parent..
                jassert (child->parent == nullptr);

                if (child->parent != nullptr)
                {
                    jassert (child->parent->children.indexOf (child) >= 0);
                    child->parent->removeChild (child->parent->children.indexOf (child), undoManager);
                }

                if (undoManager == nullptr)
                {
                    children.insert (index, child);
                    child->parent = this;
                    sendChildAddedMessage (ValueTree (*child));
                    child->sendParentChangeMessage();
                }
                else
                {
                    if (! isPositiveAndBelow (index, children.size()))
                        index = children.size();

                    undoManager->perform (new AddOrRemoveChildAction (*this, index, child));
                }
            }
            else
            {
                // You're attempting to create a recursive loop! A node
                // can't be a child of one of its own children!
                jassertfalse;
            }
        }
    }

    void removeChild (int childIndex, UndoManager* undoManager)
    {