How do I convert the data in a TStringGrid to a TTreeView

I have a StringGrid containing columns, Building, Floor, Room, Equipment. Thus each of several buildings listed could have several floors and each floor could contain a number of rooms and in each room there could be different pieces of equipment.  The grid could have up to 2000 rows.  I need to convert these tables to a TreeView as per the example below:  

In StringGrid form the data looks like this
Building     Floor     Room     Equipment
Building1   Floor1   Room1   Equipment1
Building1   Floor1   Room1   Equipment2
Building1   Floor1   Room1   EquipmentX
Building1   Floor1   Room2   Equipment1
Building1   Floor1   Room2   Equipment1

In tree from the data will look as below:

Can any one help with a piece of code or an idea that can solve this.  I tried several methods, one being running down the columns in the grid, one of the other and creating a node in the tree when there is a change, e.g. floor1 changes to floor2, but this falls flat when there is not always a change, e.g when floor 1 has only a room1 and going onto floor2 with also only a room 1.
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Geert GOracle dbaCommented:
you need to check for every column change
and save the previous item for each level for each column

i just typed this in this editor, don't have Delphi here,
i'll test it tomorrow if any problems :)
procedure TForm1.ConvertGridToTreeView(aGrid: TStringGrid; aTreeview: TTreeview);
const MaxColumns = 4;
var I, J, nJ: Integer;
  LastCells: Array[1..MaxColumns] of string;
  PrevItems: Array[1..MaxColumns] of TTreeNode;
  aNode: TTreeNode;
  for I := 1 to MaxColumns do 
    LastCells[I] := '';
    PrevItems[I] := nil;
    for I := 1 to aGrid.Rows do 
      nJ := 0;
      for J := 1 to MaxColumns do  
        if aGrid.Cells[I, J] <> LastCells[J] then 
          nJ := J;
      // nJ is the first column which is different
      // if nJ = 1 then first column = new top node
      if nJ = 1 then 
        aNode := aTreeView.Items.Add(nil, aGrid.Cells[I, nJ];
        // Reset prev subnodes
        for J := 2 to MaxColumns do 
          PrevItems[J] := nil;
        aNode := aTreeView.Items.Add(PrevItems[nJ-1], aGrid.Cells[I, nJ]);
        // Reset prev subnodes
        for J := nJ + 1 to MaxColumns do 
          PrevItems[J] := nil;
      PrevItems[nj] := aNode;
      for J := 1 to MaxColumns do 
        LastCells[J] := aGrid.Cells[I, J];

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Mike LittlewoodEngineerCommented:
As another alternate, you could take a look at the TMS TAdvStringGrid from
It has the ability of being able to group items like this automatically and build them as a treeview inside a the string grid. Much more flexible as you can turn on and off groupings of each individual column, allowing the user to view the data as they would like.
HenryM2Author Commented:
Sorry , I was under the impresion that the question was closed  
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