const
  IndicatorWidth = 11;

procedure Register;

implementation

uses DBConsts, Dialogs;

{$R dbvgrids.res}

procedure Register;
begin
  RegisterComponents(''''Data Controls'''',  [ TVDBGrid ]);
//  RegisterPropertyEditor(TypeInfo(TDBGridColumns), TCustomVDBGrid,
//                        ''''Columns'''', TDBGridColumnsEditor);
end;

const
  bmArrow = ''''DBVGARROW'''';
  bmEdit = ''''DBVEDIT'''';
  bmInsert = ''''DBVINSERT'''';
  bmMultiDot = ''''DBVMULTIDOT'''';
  bmMultiArrow = ''''DBVMULTIARROW'''';

  MaxMapSize = (MaxInt div 2) div SizeOf(Integer);  { 250 million }

{ Error reporting }

procedure RaiseGridError(const S: string);
begin
  raise EInvalidGridOperation.Create(S);
end;

procedure KillMessage(Wnd: HWnd; Msg: Integer);
// Delete the requested message from the queue, but throw back
// any WM_QUIT msgs that PeekMessage may also return
var
  M: TMsg;
begin
  M.Message := 0;
  if PeekMessage(M, Wnd, Msg, Msg, pm_Remove) and (M.Message = WM_QUIT) then
    PostQuitMessage(M.wparam);
end;

{ TVDBGridInplaceEdit }

{ TVDBGridInplaceEdit adds support for a button on the in-place editor,
  which can be used to drop down a table-based lookup list, a stringlist-based
  pick list, or (if button style is esEllipsis) fire the grid event
  OnEditButtonClick.  }

type
  TEditStyle = (esSimple, esEllipsis, esPickList, esDataList);
  TPopupListbox = class;

  TVDBGridInplaceEdit = class(TInplaceEdit)
  private
    FButtonWidth: Integer;
    FDataList: TDBLookupListBox;
    FPickList: TPopupListbox;
    FActiveList: TWinControl;
    FLookupSource: TDatasource;
    FEditStyle: TEditStyle;
    FListVisible: Boolean;
    FTracking: Boolean;
    FPressed: Boolean;
    procedure ListMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure SetEditStyle(Value: TEditStyle);
    procedure StopTracking;
    procedure TrackButton(X,Y: Integer);
    procedure CMCancelMode(var Message: TCMCancelMode); message CM_CancelMode;
    procedure WMCancelMode(var Message: TMessage); message WM_CancelMode;
    procedure WMKillFocus(var Message: TMessage); message WM_KillFocus;
    procedure WMLButtonDblClk(var Message: TWMLButtonDblClk); message wm_LButtonDblClk;
    procedure WMPaint(var Message: TWMPaint); message wm_Paint;
    procedure WMSetCursor(var Message: TWMSetCursor); message WM_SetCursor;
  protected
    procedure BoundsChanged; override;
    procedure CloseUp(Accept: Boolean);
    procedure DoDropDownKeys(var Key: Word; Shift: TShiftState);
    procedure DropDown;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
    procedure PaintWindow(DC: HDC); override;
    procedure UpdateContents; override;
    procedure WndProc(var Message: TMessage); override;
    property  EditStyle: TEditStyle read FEditStyle write SetEditStyle;
    property  ActiveList: TWinControl read FActiveList write FActiveList;
    property  DataList: TDBLookupListBox read FDataList;
    property  PickList: TPopupListbox read FPickList;
  public
    constructor Create(Owner: TComponent); override;
  end;

{ TPopupListbox }

  TPopupListbox = class(TCustomListbox)
  private
    FSearchText: String;
    FSearchTickCount: Longint;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure CreateWnd; override;
    procedure KeyPress(var Key: Char); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
  end;

procedure TPopupListBox.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  with Params do
  begin
    Style := Style or WS_BORDER;
    ExStyle := WS_EX_TOOLWINDOW or WS_EX_TOPMOST;
    WindowClass.Style := CS_SAVEBITS;
  end;
end;

procedure TPopupListbox.CreateWnd;
begin
  inherited CreateWnd;
  Windows.SetParent(Handle, 0);
  CallWindowProc(DefWndProc, Handle, wm_SetFocus, 0, 0);
end;

procedure TPopupListbox.Keypress(var Key: Char);
var
  TickCount: Integer;
begin
  case Key of
    #8, #27: FSearchText := '''''''';
    #32..#255:
      begin
        TickCount := GetTickCount;
        if TickCount - FSearchTickCount > 2000 then FSearchText := '''''''';
        FSearchTickCount := TickCount;
        if Length(FSearchText) < 32 then FSearchText := FSearchText + Key;
        SendMessage(Handle, LB_SelectString, WORD(-1), Longint(PChar(FSearchText)));
        Key := #0;
      end;
  end;
  inherited Keypress(Key);
end;

procedure TPopupListbox.MouseUp(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
begin
  inherited MouseUp(Button, Shift, X, Y);
  TVDBGridInPlaceEdit(Owner).CloseUp((X >= 0) and (Y >= 0) and
      (X < Width) and (Y < Height));
end;

constructor TVDBGridInplaceEdit.Create(Owner: TComponent);
begin
  inherited Create(Owner);
  FLookupSource := TDataSource.Create(Self);
  FButtonWidth := GetSystemMetrics(SM_CXVSCROLL);
  FEditStyle := esSimple;
end;

procedure TVDBGridInplaceEdit.BoundsChanged;
var
  R: TRect;
begin
  SetRect(R, 2, 2, Width - 2, Height);
  if FEditStyle <> esSimple then Dec(R.Right, FButtonWidth);
  SendMessage(Handle, EM_SETRECTNP, 0, LongInt(@R));
  SendMessage(Handle, EM_SCROLLCARET, 0, 0);
  if SysLocale.Fareast then
    SetImeCompositionWindow(Font, R.Left, R.Top);
end;

procedure TVDBGridInplaceEdit.CloseUp(Accept: Boolean);
var
  MasterField: TField;
  ListValue: Variant;
begin
  if FListVisible then
  begin
    if GetCapture <> 0 then SendMessage(GetCapture, WM_CANCELMODE, 0, 0);
    if FActiveList = FDataList then
      ListValue := FDataList.KeyValue
    else
      if FPickList.ItemIndex <> -1 then
        ListValue := FPickList.Items[FPicklist.ItemIndex];
    SetWindowPos(FActiveList.Handle, 0, 0, 0, 0,

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