偶写的第一个控件,一个用选择代替输入的Edit控件

{***************************************************************}
{                                                               }
{             Siow写的第一个控件                                }
{                                                               }
{用途：主要用于数据录入界面                                     }
{特点：用选择代替输入，减少人工录入时的低级错误                 }
{版本：V1.1                                                     }
{已知Bugs:1、在设计期如果数据源Active就无法编译                 }
{         2、ConnectionString编缉问题。加上ADOReg,DesignIntf后，}
{            控件可安装却有好多引用单元无法编译,郁闷-_-!        }
{联系方式：E-Mail:fuyushui@sohu.com                             }
{          QQ:1253366                                           }
{                                                               }
{                                                               }
{***************************************************************}

unit DBLookUpEdit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DBGrids, StdCtrls, DB, ADODB;
  //,ADOReg,DesignIntf,DesignEditors
type

  {TDBLookUpEdit}

  TDBLookUpEdit = class(TEdit)
  private
    FCreating:   Boolean;
    FKeyField:   WideString;
    FDBGrid :    TDBGrid;
    FADOQuery:   TADOQuery;
    FDataSource: TDataSource;
    FOnEnter:    TNotifyEvent;
    FOnExit:     TNotifyEvent;
    FOnChange:   TNotifyEvent;
    //FOnClick: TNotiFyEvent;
    //FOnDblClick:TNotifyEvent;
    procedure CNCommand(var Message: TWMCommand);
      message CN_COMMAND;
    function GetActive: Boolean;
    procedure SetActive(Value: Boolean);
    function  GetDataSource: TDataSource;
    procedure SetDataSource(Value: TDataSource);
    function GetConnectionString: WideString;
    procedure SetConnectionString(const Value: WideString);
    function GetConnection: TADOConnection;
    procedure SetConnection(const Value: TADOConnection);
    function GetSQL: TStrings;
    procedure SetSQL(const Value: TStrings);
    procedure SetRecText(FieldNo: integer);
    procedure DoFDBGridMouseUp(Sender: TObject; Button: TMouseButton;Shift: TShiftState; X, Y: Integer);
    procedure DoFDBGridKeyDown(Sender: TObject; var Key: Word;Shift: TShiftState);
  protected
    procedure SetParent(AParent: TWinControl); override;
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;
    procedure CMVisiblechanged(var Message: TMessage);
      message CM_VISIBLECHANGED;
    procedure CMEnabledchanged(var Message: TMessage);
      message CM_ENABLEDCHANGED;
    procedure CMBidimodechanged(var Message: TMessage);
      message CM_BIDIMODECHANGED;
    procedure FDoEnter(Sender: TObject);
    procedure FDoExit(Sender: TObject);
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure KeyUp(var Key: Word; Shift: TShiftState); override;
    procedure Loaded; override;
    procedure CreateWnd; override;
  public
    constructor Create(AOwner: TComponent); override;
    procedure SetBounds(ALeft: Integer; ATop: Integer; AWidth: Integer; AHeight: Integer); override;

  published
    //procedure Click;override;
    property KeyFieldName:WideString read FKeyField write FKeyField;
    procedure DblClick; override;
    property OnEnter: TNotifyEvent read FOnEnter write FOnEnter;
    property OnExit: TNotifyEvent read FOnExit write FOnExit;
    property OnChange: TNotifyEvent read FOnChange write FOnChange;
    //property OnClick: TNotifyEvent read FOnClick write FOnClick;
    //property OnDblClick: TNotifyEvent read FOnDblClick write FOnDblClick;
    //property DataSource: TDataSource read GetDataSource write SetDataSource;
    property Active: Boolean read GetActive write SetActive default False;
    property ConnectionString: WideString read GetConnectionString write SetConnectionString;
    property Connection: TADOConnection read GetConnection write SetConnection;
    property SQL: TStrings read GetSQL write SetSQL;
  end;

procedure Register;

implementation

{ TDBLookUpEdit }

procedure Register;
begin
  RegisterComponents(''''LD Controls'''', [TDBLookUpEdit]);
  //RegisterPropertyEditor(TypeInfo(WideString), TDBLookUpEdit, ''''ConnectionString'''', TConnectionStringProperty);
end;

constructor TDBLookUpEdit.Create(AOwner: TComponent);
begin
  inherited;
  FDBGrid     :=TDBGrid.Create(Self);
  FADOQuery   :=TADOQuery.Create(self);
  FDataSource :=TDataSource.Create(self);

  FDBGrid.FreeNotification(self);
  FADOQuery.FreeNotification(self);
  FDataSource.FreeNotification(self);

  FDataSource.DataSet:=FADOQuery;
  with FDBGrid do
  begin
    DataSource:=FDataSource;
    Ctl3D:=false;
    Visible:=false;
    ParentCtl3D:=false;
    Options:=[dgColLines,dgRowLines,dgRowSelect,dgAlwaysShowSelection,dgConfirmDelete,dgCancelOnExit];
    OnMouseUp:=DoFDBGridMouseUp;
    OnKeyDown:=DoFDBGridKeyDown;
  end;

  with self do
  begin
    ParentCtl3D:=false;
    Ctl3D:=false;
  end;
end;

procedure TDBLookUpEdit.CreateWnd;
begin
  FCreating := True;
  try
    inherited CreateWnd;
  finally
    FCreating := False;
  end;
end;

procedure TDBLookUpEdit.CMBidimodechanged(var Message: TMessage);
begin
  inherited;
  FDBGrid.BiDiMode := BiDiMode;
end;

procedure TDBLookUpEdit.CMEnabledchanged(var Message: TMessage);
begin
  inherited;
  FDBGrid.Enabled := Enabled;
end;

procedure TDBLookUpEdit.CMVisiblechanged(var

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