TTreeView

Code:

function IsTreeviewFullyExpanded(tv: TTreeview): Boolean;

var

  Node: TTreeNode;

begin

  Assert(Assigned(tv));

  if tv.Items.Count > 0 then

  begin

    Node   := tv.Items[0];

    Result := True;

    while Result and Assigned(Node) do

    begin

      Result := Node.Expanded or not Node.HasChildren;

      Node   := Node.GetNext;

    end; {While}

  end {If}

  else

    Result := False

end;

function IsTreeviewFullyCollapsed(tv: TTreeview): Boolean;

var

  Node: TTreeNode;

begin

  Assert(Assigned(tv));

  if tv.Items.Count > 0 then

  begin

    Node   := tv.Items[0];

    Result := True;

    while Result and Assigned(Node) do

    begin

      Result := not (Node.Expanded and Node.HasChildren);

      Node   := Node.GetNext;

    end; {While}

  end {If}

  else

    Result := False

end;