dragtogridform.pas

这是一本关于delphi方面的书籍,其中有一些delphi的实例.

unit DragToGridForm;

interface

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

type
  TFormDrag = class(TForm)
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    Table1: TTable;
    LabelDrag: TLabel;
    EditDrag: TEdit;
    procedure DBGrid1DragDrop(Sender, Source: TObject; X, Y: Integer);
    procedure DBGrid1DragOver(Sender, Source: TObject; X, Y: Integer;
      State: TDragState; var Accept: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FormDrag: TFormDrag;

implementation

{$R *.DFM}

type
  TDBGHack = class (TDbGrid)
  end;

procedure TFormDrag.DBGrid1DragDrop(Sender, Source: TObject; X, Y: Integer);
var
  gc: TGridCoord;
begin
  gc := TDBGHack(DbGrid1).MouseCoord (x, y);
  if (gc.y > 0) and (gc.x > 0) then
  begin
    DbGrid1.DataSource.DataSet.MoveBy (gc.y - TDBGHack(DbGrid1).Row);
    DbGrid1.DataSource.DataSet.Edit;
    DBGrid1.Columns.Items [gc.X - 1].Field.AsString := EditDrag.Text;
  end;
  DBGrid1.SetFocus;
end;

procedure TFormDrag.DBGrid1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
  Accept := (Source = LabelDrag);
end;

end.