// Модуль MyDBGrid

unit MyDBGrid;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DBGrids;

type

  TMyDBGrid = class(TDBGrid)
  private
    { Private declarations }
    FOnMouseDown: TMouseEvent;
  protected
    { Protected declarations }
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
  published
    { Published declarations }
    property Row;
    property OnMouseDown read FOnMouseDown write FOnMouseDown;
  end;

procedure Register;

implementation

procedure TMyDBGrid.MouseDown(Button: TMouseButton;

  Shift: TShiftState; X, Y: Integer);
begin

  if Assigned(FOnMouseDown) then
    FOnMouseDown(Self, Button, Shift, X, Y);
  inherited MouseDown(Button, Shift, X, Y);
end;

procedure Register;
begin

  RegisterComponents('Samples', [TMyDBGrid]);
end;

end.

// Модуль GridU1

unit GridU1;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, Db, DBTables, Grids, DBGrids, MyDBGrid, StdCtrls;

type

  TForm1 = class(TForm)
    MyDBGrid1: TMyDBGrid;
    Table1: TTable;
    DataSource1: TDataSource;
    Table2: TTable;
    DataSource2: TDataSource;
    MyDBGrid2: TMyDBGrid;
    procedure MyDBGrid1MouseDown(Sender: TObject;
      Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
    procedure MyDBGrid1DragOver(Sender, Source: TObject;
      X, Y: Integer; State: TDragState; var Accept: Boolean);
    procedure MyDBGrid1DragDrop(Sender, Source: TObject;
      X, Y: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var

  Form1: TForm1;

implementation

{$R *.DFM}

var

  SGC: TGridCoord;

procedure TForm1.MyDBGrid1MouseDown(Sender: TObject;

  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var

  DG: TMyDBGrid;
begin

  DG := Sender as TMyDBGrid;
  SGC := DG.MouseCoord(X, Y);
  if (SGC.X > 0) and (SGC.Y > 0) then
    (Sender as TMyDBGrid).BeginDrag(False);
end;

procedure TForm1.MyDBGrid1DragOver(Sender, Source: TObject;

  X, Y: Integer; State: TDragState; var Accept: Boolean);
var

  GC: TGridCoord;
begin

  GC := (Sender as TMyDBGrid).MouseCoord(X, Y);
  Accept := Source is TMyDBGrid and (GC.X > 0) and (GC.Y > 0);
end;

procedure TForm1.MyDBGrid1DragDrop(Sender, Source: TObject;

  X, Y: Integer);
var

  DG: TMyDBGrid;
  GC: TGridCoord;
  CurRow: Integer;
begin

  DG := Sender as TMyDBGrid;
  GC := DG.MouseCoord(X, Y);
  with DG.DataSource.DataSet do
  begin
    with (Source as TMyDBGrid).DataSource.DataSet do
      Caption := 'Вы перетащили "' + Fields[SGC.X - 1].AsString + '"';
    DisableControls;
    CurRow := DG.Row;
    MoveBy(GC.Y - CurRow);
    Caption := Caption + ' в "' + Fields[GC.X - 1].AsString + '"';
    MoveBy(CurRow - GC.Y);
    EnableControls;
  end;
end;

end.

// Форма GridU1

object Form1: TForm1

  Left = 200
    Top = 108
    Width = 544
    Height = 437
    Caption = 'Form1'
    Font.Charset = DEFAULT_CHARSET
    Font.Color = clWindowText
    Font.Height = -11
    Font.Name = 'MS Sans Serif'
    Font.Style = []
    PixelsPerInch = 96
    TextHeight = 13
    object MyDBGrid1: TMyDBGrid
    Left = 8
      Top = 8
      Width = 521
      Height = 193
      DataSource = DataSource1
      Row = 1
      TabOrder = 0
      TitleFont.Charset = DEFAULT_CHARSET
      TitleFont.Color = clWindowText
      TitleFont.Height = -11
      TitleFont.Name = 'MS Sans Serif'
      TitleFont.Style = []
      OnDragDrop = MyDBGrid1DragDrop
      OnDragOver = MyDBGrid1DragOver
      OnMouseDown = MyDBGrid1MouseDown
  end
  object MyDBGrid2: TMyDBGrid
    Left = 7
      Top = 208
      Width = 521
      Height = 193
      DataSource = DataSource2
      Row = 1
      TabOrder = 1
      TitleFont.Charset = DEFAULT_CHARSET
      TitleFont.Color = clWindowText
      TitleFont.Height = -11
      TitleFont.Name = 'MS Sans Serif'
      TitleFont.Style = []
      OnDragDrop = MyDBGrid1DragDrop
      OnDragOver = MyDBGrid1DragOver
      OnMouseDown = MyDBGrid1MouseDown
  end
  object Table1: TTable
    Active = True
      DatabaseName = 'DBDEMOS'
      TableName = 'ORDERS'
      Left = 104
      Top = 48
  end
  object DataSource1: TDataSource
    DataSet = Table1
      Left = 136
      Top = 48
  end
  object Table2: TTable
    Active = True
      DatabaseName = 'DBDEMOS'
      TableName = 'CUSTOMER'
      Left = 104
      Top = 240
  end
  object DataSource2: TDataSource
    DataSet = Table2
      Left = 136
      Top = 240
  end
end