[[nlsgarcia]]

santiago14,

Empezado por santiago14

...estoy buscando la forma de hacer el autocompletado...Si hay una solución mas simple, mejor...

Revisa este código basado en la solución sugerida en el Msg #4 y en el comportamiento de la función SHAutoComplete (Windows API):

Código Delphi [-]
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, StrUtils, ExtCtrls;

type
  TComboBox = class(StdCtrls.TComboBox)
  private
    VK : Boolean;
    AuxText : String;
    History : String;
    FStoredItems : TStringList;
    procedure FilterItems;
    procedure StoredItemsChange(Sender: TObject);
    procedure SetStoredItems(const Value: TStringList);
    procedure ComboExit(Sender: TObject);
    procedure ComboCloseUp(Sender: TObject);
    procedure ComboKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
    procedure CNCommand(var Message: TWMCommand); Message CN_COMMAND;
  protected
  public
    constructor Create(Owner: TComponent); override;
    destructor Destroy; override;
    property StoredItems : TStringList read FStoredItems write SetStoredItems;
  end;

type
  TForm1 = class(TForm)
    ComboBox1 : TComboBox;
    Button1 : TButton;
    procedure Button1Click(Sender: TObject);
  private
  public
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

constructor TComboBox.Create(Owner: TComponent);
var
   FS : TFileStream;

begin

   inherited;

   AutoComplete := False;
   FStoredItems := TStringList.Create;
   FStoredItems.OnChange := StoredItemsChange;
   History := 'History.txt';
   Self.OnExit := ComboExit;
   Self.OnCloseUp := ComboCloseUp;
   Self.OnKeyDown := ComboKeyDown;
   Self.Sorted := True;
   Self.DropDownCount := 30;

   if not FileExists(History) then
   begin
      FS := TFileStream.Create(History, fmCreate);
      FS.Free;
   end;

   Self.StoredItems.LoadFromFile(History);

end;

destructor TComboBox.Destroy;
begin
   FStoredItems.Free;
   inherited;
end;

procedure TComboBox.CNCommand(var Message: TWMCommand);
begin

   inherited;

   if Message.NotifyCode = CBN_EDITUPDATE then
      FilterItems;

end;

procedure TComboBox.FilterItems;
var
   i : Integer;
   StartPos, EndPos : Integer;

begin

   SendMessage(Handle, CB_GETEDITSEL, WPARAM(@StartPos), LPARAM(@EndPos));

   AuxText := Text;

   if Text <> '' then
   begin

      Items.Clear;

      for i := 0 to FStoredItems.Count - 1 do
      begin
         if PosEx(LowerCase(Text), LowerCase(FStoredItems[i])) > 0 then
            Items.Add(FStoredItems[i]);
      end;

   end
   else
      Items.Assign(FStoredItems);

   SendMessage(Handle, CB_SHOWDROPDOWN, Integer(True), 0);

   Text := AuxText;

   SendMessage(Handle, CB_SETEDITSEL, 0, MakeLParam(StartPos, EndPos));

end;

procedure TComboBox.StoredItemsChange(Sender: TObject);
begin

   if Assigned(FStoredItems) then
      FilterItems;

end;

procedure TComboBox.SetStoredItems(const Value: TStringList);
begin
   if Assigned(FStoredItems) then
      FStoredItems.Assign(Value)
end;

procedure TComboBox.ComboExit(Sender: TObject);
begin

   if (Items.IndexOf(Text) = -1) and (Text <> EmptyStr) then
   begin
      FStoredItems.Add(Text);
      FStoredItems.SaveToFile(History);
   end;

end;

procedure TComboBox.ComboCloseUp(Sender: TObject);
begin

   If (AuxText <> EmptyStr) and (VK = False) then
   begin
      Text := AuxText;
   end;

   VK := False;

end;

procedure TComboBox.ComboKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
   if (Key = VK_UP) or (Key = VK_DOWN) then
      VK := True;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   ShowMessage(ComboBox1.Text);
end;

end.

El código anterior simula de forma básica la función SHAutoComplete en un componente TComboBox modificado, como se muestra en la siguiente imagen:



El ejemplo esta disponible en el link: http://terawiki.clubdelphi.com/Delph...e_ComboBox.rar

Espero sea útil

Nelson.