TreeView Drag and Drop en Delphi.net

[XaRz]

Dios cuanta incultura que trajino por ahi...

En resumen, he incorporado tal cual el Formulario que viene con el ejemplo de Marco Cantú a mi proyecto .NET y tachánnn! sorpresa porque ningun problema de mezclar classes TTreeView con proyectos.net. Es mas, no hay problema con mezclar units .NET i win32!
Esto es la leche!
Se me ha abierto un mundo de clases que tenia por desaprovechadas por una falta de conocimiento al respecto...que inculto soy...

Si alguien necesita implementar algo parecido le pasteo el codigo que ya advierto que es de marco cantú..(espero que no incumpla ningún copyright chungo por pastear esto...y si lo incumplo no me lo tengáis en cuenta

unit TreeForm;

interface

{$WARN UNIT_PLATFORM OFF}

uses
  SysUtils, Windows, Messages, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ComCtrls, Menus;

type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    MainMenu1: TMainMenu;
    Options1: TMenuItem;
    File1: TMenuItem;
    Exit1: TMenuItem;
    Help1: TMenuItem;
    About1: TMenuItem;
    Root1: TMenuItem;
    Buttons1: TMenuItem;
    Lines1: TMenuItem;
    N1: TMenuItem;
    Font1: TMenuItem;
    FontDialog1: TFontDialog;
    ExpandAll1: TMenuItem;
    N2: TMenuItem;
    procedure FormCreate(Sender: TObject);
    procedure About1Click(Sender: TObject);
    procedure Root1Click(Sender: TObject);
    procedure Buttons1Click(Sender: TObject);
    procedure Lines1Click(Sender: TObject);
    procedure Exit1Click(Sender: TObject);
    procedure Font1Click(Sender: TObject);
    procedure TreeView1DragOver(Sender, Source: TObject; X, Y: Integer;
      State: TDragState; var Accept: Boolean);
    procedure TreeView1DragDrop(Sender, Source: TObject; X, Y: Integer);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure TreeView1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure ExpandAll1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  TreeView1.LoadFromFile (
    ExtractFilePath (Application.ExeName) + 'TreeText.txt');
end;

procedure TForm1.About1Click(Sender: TObject);
begin
  MessageDlg ('DragTree Example'#13'by Marco Cantù',
    mtInformation, [mbOk], 0);
end;

procedure TForm1.Root1Click(Sender: TObject);
begin
  TreeView1.ShowRoot := not TreeView1.ShowRoot;
  Root1.Checked := TreeView1.ShowRoot;
end;

procedure TForm1.Buttons1Click(Sender: TObject);
begin
  TreeView1.ShowButtons := not TreeView1.ShowButtons;
  Buttons1.Checked := TreeView1.ShowButtons;
end;

procedure TForm1.Lines1Click(Sender: TObject);
begin
  TreeView1.ShowLines := not TreeView1.ShowLines;
  Lines1.Checked := TreeView1.ShowLines;
end;

procedure TForm1.Exit1Click(Sender: TObject);
begin
  Close;
end;

procedure TForm1.Font1Click(Sender: TObject);
begin
  if FontDialog1.Execute then
    TreeView1.Font := FontDialog1.Font;
end;

procedure TForm1.TreeView1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
var
  TargetNode, SourceNode: TTreeNode;
begin
  TargetNode := TreeView1.GetNodeAt (X, Y);
  // accept dragging from itself
  if (Source = Sender) and (TargetNode <> nil) then
  begin
    Accept := True;
    // determines source and target
    SourceNode := TreeView1.Selected;
    // look up the target parent chain
    while (TargetNode.Parent <> nil) and
        (TargetNode <> SourceNode) do
      TargetNode := TargetNode.Parent;
    // if source is found
    if TargetNode = SourceNode then
      // do not allow dragging over a child
      Accept := False;
  end
  else
    Accept := False;
end;

procedure TForm1.TreeView1DragDrop(Sender, Source: TObject;
  X, Y: Integer);
var
  TargetNode, SourceNode: TTreeNode;
begin
  TargetNode := TreeView1.GetNodeAt (X, Y);
  if TargetNode <> nil then
  begin
    SourceNode := TreeView1.Selected;
    SourceNode.MoveTo (TargetNode, naAddChildFirst);
    TargetNode.Expand (False);
    TreeView1.Selected := TargetNode;
  end;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  TreeView1.SaveToFile (
    ExtractFilePath (Application.ExeName) + 'TreeText.txt');
end;

procedure TForm1.TreeView1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  TreeView1.BeginDrag (False); 
end;

procedure TForm1.ExpandAll1Click(Sender: TObject);
begin
  // either:
  TreeView1.FullExpand;
  // or:
  // TreeView1.Items [0].Expand(True);
end;

end.

Ale grácias de todos modos.