Is there a TDBComboBox equivalent that goes by ItemIndex?

霸气de小男生 提交于 2019-12-08 02:41:43

问题


In the helpfile entry for TDBComboBox, it says that the text of the selected option becomes the new value for the field. Is there any similar control that goes by ItemIndex instead of text? (To represent an enumerated type, for example.)


回答1:


Try the TDBLookupComboBox. Check out the ListField, DataField and KeyField properties.




回答2:


You can fill TDBComboBox items with numbers ('0, '1', '2', ...), but set DBComboBox1.Style to csOwnerDrawFixed and write OnItemDraw event. Something like this:

procedure TForm1.DBComboBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
begin
  with (Sender as TDBComboBox).Canvas do
  begin
    FillRect(Rect);
    TextRect(Rect, Rect.Left+1, Rect.Top+1, MyValueDescriptions[Index]);
  end;
end;


来源:https://stackoverflow.com/questions/299548/is-there-a-tdbcombobox-equivalent-that-goes-by-itemindex

易学教程内所有资源均来自网络或用户发布的内容,如有违反法律规定的内容欢迎反馈
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!