unit1.pas

《Delphi7编程100例》代码,书配资料

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids, DBGrids, StdCtrls, DB, DBTables, ExtCtrls, DBCtrls;

type
  TForm1 = class(TForm)
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    Table1: TTable;
    Button1: TButton;
    ComboBox1: TComboBox;
    DBNavigator1: TDBNavigator;
    procedure DBGrid1DragOver(Sender, Source: TObject; X, Y: Integer;
      State: TDragState; var Accept: Boolean);
    procedure DBGrid1DragDrop(Sender, Source: TObject; X, Y: Integer);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.DBGrid1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
  Accept:=True;
end;

procedure TForm1.DBGrid1DragDrop(Sender, Source: TObject; X, Y: Integer);
begin
  if Source<>ComboBox1 then
    Exit;
  with Sender as TDBGrid do
  begin
    Perform(wm_LButtonDown,0,MakeLong(x,y));
    PerForm(WM_LButtonUp, 0,MakeLong(x,y));
    SelectedField.Dataset.edit;
    SelectedField.AsString:=ComboBox1.Text;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Table1.Edit;
  Table1.Post;
end;

end.