关于DBGrid的内嵌控件

Question

只要在DrawDataCell事件里面处理就好了，主要是调整控件的位置，这里有一个别人的例子，在DBGrid中嵌入了一个DBComboBox
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DBCtrls, Grids, DBGrids, DB, DBTables;type
  TForm1 = class(TForm)
    Table1: TTable;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    DBComboBox1: TDBComboBox;
    DBComboBox2: TDBComboBox;
    DBComboBox3: TDBComboBox;
    procedure DBGrid1DrawDataCell(Sender: TObject; const Rect: TRect;
      Field: TField; State: TGridDrawState);
    procedure DBGrid1ColExit(Sender: TObject);
    procedure DBGrid1KeyPress(Sender: TObject; var Key: Char);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const Rect: TRect;
  Field: TField; State: TGridDrawState);
begin
  if (gdFocused in State) then
  begin
     if (Field.FieldName = DBCombobox1.DataField) then
     begin
       DBCombobox1.Left :=Rect.Left + DBgrid1.Left;
       DBCombobox1.Top := Rect.Top + DBgrid1.Top;
       DBCombobox1.Width := Rect.Right - Rect.Left;
       DBCombobox1.Visible :=True;
     end;
     if (Field.FieldName = DBCombobox2.DataField) then
     begin
       DBCombobox2.Left :=Rect.Left + DBgrid1.Left;
       DBCombobox2.Top := Rect.Top + DBgrid1.Top;
       DBCombobox2.Width := Rect.Right - Rect.Left;
       DBCombobox2.Visible :=True;
     end;     if (Field.FieldName = DBCombobox3.DataField) then
     begin
       DBCombobox3.Left :=Rect.Left + DBgrid1.Left;
       DBCombobox3.Top := Rect.Top + DBgrid1.Top;
       DBCombobox3.Width := Rect.Right - Rect.Left;
       DBCombobox3.Visible :=True;
     end;
  end;
end;procedure TForm1.DBGrid1ColExit(Sender: TObject);
begin
  if DBGrid1.SelectedField.FieldName = DBCombobox1.DataField then
  begin
    DBCombobox1.Visible := false;
  end;
  if DBGrid1.SelectedField.FieldName = DBCombobox2.DataField then
  begin
    DBCombobox2.Visible := false;
  end;
  if DBGrid1.SelectedField.FieldName = DBCombobox3.DataField then
  begin
    DBCombobox3.Visible := false;
  end;
end;procedure TForm1.DBGrid1KeyPress(Sender: TObject; var Key: Char);
begin
  if (key <> chr(9)) then
  begin
   if (DBGrid1.SelectedField.FieldName = DBCombobox1.DataField ) then
   begin
     DBCombobox1.SetFocus;
     SendMessage(DBCombobox1.Handle,WM_CHAR,word(Key),0);
   end;   if (DBGrid1.SelectedField.FieldName = DBCombobox2.DataField ) then
   begin
     DBCombobox2.SetFocus;
     SendMessage(DBCombobox1.Handle,WM_CHAR,word(Key),0);
   end;   if (DBGrid1.SelectedField.FieldName = DBCombobox3.DataField ) then
   begin
     DBCombobox3.SetFocus;
     SendMessage(DBCombobox1.Handle,WM_CHAR,word(Key),0);
   end;
  end;
end;end.