How to change property values (RTTI) (Views: 1215)
Problem/Question/Abstract: I use setpropvalue() function to set property values. It works fine if I set properties that are on first level (i.e.. button1.caption, button1.name,..), but it fails if I want to set properties like button1.font.name or radiogroup.items.text. Answer: function GetProperty(AControl: TPersistent; AProperty: string): PPropInfo; var i: Integer; props: PPropList; typeData: PTypeData; begin Result := nil; if (AControl = nil) or (AControl.ClassInfo = nil) then Exit; typeData := GetTypeData(AControl.ClassInfo); if (typeData = nil) or (typeData^.PropCount = 0) then Exit; GetMem(props, typeData^.PropCount * SizeOf(Pointer)); try GetPropInfos(AControl.ClassInfo, props); for i := 0 to typeData^.PropCount - 1 do begin with Props^[i]^ do if (Name = AProperty) then result := Props^[i]; end; finally FreeMem(props); end; end; procedure TForm1.Button1Click(Sender: TObject); var propInfo: PPropInfo; begin PropInfo := GetProperty(Button1.Font, 'Name'); if PropInfo <> nil then SetStrProp(Button1.Font, PropInfo, 'Arial'); end; |