Treeview search/Delphi

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;
 
type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    Button1: TButton;
    ListBox1: TListBox;
    btnGoToNode: TButton;
    procedure Button1Click(Sender: TObject);
    procedure TreeView1Addition(Sender: TObject; Node: TTreeNode);
    procedure btnGoToNodeClick(Sender: TObject);
  private
    fNodeList: TStringList;
    fUniqueId: integer;
    procedure AddRandomNode(Tree: TTreeview);
    procedure AddNode(Tree: TTreeView; aUniqueId, aParentId: integer; aDescr: string);
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  end;
 
  TDataObj = class(TObject)
  private
    fParentId: integer;
    fNodeId: integer;
    fDescr: string;
  public
    property NodeID: integer read fNodeId write fNodeId;
    property ParentID: integer read fParentId write fParentId;
    property Description: string read fDescr write fDescr;
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.AddNode(Tree: TTreeView; aUniqueId, aParentId: integer; aDescr: string);
var pp: TTreeNode;
  s: string;
  obj: TDataObj;
begin
  pp := nil;
  if aParentId > 0 then
  begin
    s := fNodeList.Values[IntToStr(aParentId)];
    if s <> '' then
      pp := Tree.Items.Item[StrToInt(s)];
  end;
  obj := TDataObj.Create;
  obj.NodeID := aUniqueId;
  obj.ParentId := aParentId;
  obj.Description := Format('Id: %d Descr: %s', [aUniqueId, aDescr]);
  Tree.Items.AddChildObject(pp, obj.Description, obj);
end;
 
procedure TForm1.AddRandomNode(Tree: TTreeview);
var x, pId, n: integer;
  P: TTreeNode;
  s: string;
begin
  n := Tree.Items.Count;
  x := -1;
  if (Random(100) > 70) and (n > 2) then
    x := Random(n);
  pId := -1;
  if x <> -1 then
  begin
    P := Tree.Items.Item[x];
    pId := TDataObj(P.Data).fNodeId;
  end;
  s := 'Random text ' + IntToStr(Random(500));
  Inc(fUniqueId);
  AddNode(Tree, fUniqueId, pId, s);
end;
 
constructor TForm1.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  fUniqueId := 100;
  FNodeList := TStringList.Create;
end;
 
destructor TForm1.Destroy;
begin
  FreeAndNil(FNodeList);
  inherited Destroy;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  AddRandomNode(TreeView1);
end;
 
procedure TForm1.TreeView1Addition(Sender: TObject; Node: TTreeNode);
begin
  if Assigned(Node) then
  begin
    fNodeList.Values[IntToStr(TDataObj(Node.Data).NodeID)] := IntToStr(Node.AbsoluteIndex);
    ListBox1.Items.Assign(fNodeList);
  end;
end;
 
procedure TForm1.btnGoToNodeClick(Sender: TObject);
var s: string;
  p: TTreeNode;
begin
  s := '';
  if ListBox1.ItemIndex <> -1 then
    s := ListBox1.Items.ValueFromIndex[ListBox1.ItemIndex];
  if s <> '' then
  begin
    p := TreeView1.Items.Item[StrToInt(s)];
    ShowMessage(p.Text);
  end;
end;
 
end.
                                              

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:
76:
77:
78:
79:
80:
81:
82:
83:
84:
85:
86:
87:
88:
89:
90:
91:
92:
93:
94:
95:
96:
97:
98:
99:
100:
101:
102:
103:
104:
105:
106:
107:
108:
109:
110:
111:
112:
113:
114:
115:
116:
117:
118:
119:
120:
121:
122:
123:
124:
125:
126: