type SpTree = class(OpenXmlElement)
public
	function Create();overload;
	function Create(_node);overload;
	function Create(_parent, _prefix, _local_name);overload;
	function Init();override;
	function InitAttributes();override;
	function InitChildren();override;
	function InitNode(_node);override;
	function Copy(_obj);override;
	function AddSp();
	function AppendSp();

	property Sps read ReadSps;
	function ReadSps(_index);

public
	//  Attributes

	// Children
	NvGrpSpPr;
	GrpSpPr;

end;

function SpTree.Create();overload;
begin
	self.Create(nil, "p", "spTree");
end;

function SpTree.Create(_node);overload;
begin
	class(OpenXmlElement).Create(_node);
end;

function SpTree.Create(_parent, _prefix, _local_name);overload;
begin
	class(OpenXmlElement).Create(_parent, _prefix, _local_name);
end;

function SpTree.Init();override;
begin
	self.NvGrpSpPr := new NvGrpSpPr(self, self.Prefix, "nvGrpSpPr");
	self.GrpSpPr := new GrpSpPr(self, self.Prefix, "grpSpPr");
end;

function SpTree.InitAttributes();override;
begin
	attributes_ := array(
	);
end;

function SpTree.InitChildren();override;
begin
	child_elements_ := array(
		0: self.NvGrpSpPr,
		1: self.GrpSpPr,
	);
	sorted_child_ := array(
		"": -1,
		self.NvGrpSpPr.ElementName: 0,
		self.GrpSpPr.ElementName: 1,
	);
end;

function SpTree.InitNode(_node);override;
begin
	if ifObj(self.XmlNode) then
		for k,v in child_elements_ do v.InitNode(nil);
	self.XmlNode := ifObj(_node) ? _node : nil;
	node := ifObj(_node) ? _node.FirstChild() : nil;
	flag := false;
	if ifnil(child_elements_[0]) and length(child_elements_) > 0 then
	begin
		flag := true;
		arr := child_elements_;
		child_elements_ := array();
	end
	pre := ifString(self.Prefix) ? self.Prefix + ":" : "";
	while ifObj(node) do
	begin
		node_name := node.GetName();
		pos := sorted_child_[node_name];
		if ifnil(pos) or pos = -1 then
		begin
			obj := nil;
			case node_name of
				pre + "sp": obj := self.AppendSp();
			end;
			if ifObj(obj) then obj.InitNode(node);
		end
		else if flag then
		begin
			obj := arr[pos];
			obj.InitNode(node);
			child_elements_[length(child_elements_)] := obj;
		end
		else begin
			child_elements_[pos].InitNode(node);
		end
		node := node.NextElement();
	end
end;

function SpTree.Copy(_obj);override;
begin
	self.NvGrpSpPr.Copy(_obj.NvGrpSpPr);
	self.GrpSpPr.Copy(_obj.GrpSpPr);
end;

function SpTree.AddSp();
begin
	len := length(child_elements_);
	if len = 0 then i := -1;
	else begin
		for i:=len-1 downto 0 do
			if child_elements_[i].LocalName = "sp" then break;
	end
	obj := new Sp(self, self.Prefix, "sp");
	self.InsertChild(obj, i+1);
	return obj;
end;

function SpTree.AppendSp();
begin
	obj := new Sp(self, self.Prefix, "sp");
	child_elements_[length(child_elements_)] := obj;
	return obj;
end;

function SpTree.ReadSps(_index);
begin
	ind := ifnil(_index) ? -2 : n;
	arr := array();
	for k,v in child_elements_ do
	begin
		if v.LocalName = "sp" then
		begin
			arr[length(arr)] := v;
			ind--;
		end;
		if ind = -1 then return v;
	end;
	return arr;
end;