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+{ exsortzeos unit
+
+  Copyright (C) 2005-2017 Lagunov Aleksey alexs@yandex.ru
+  original conception from rx library for Delphi (c)
+
+  This library is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or (at your
+  option) any later version with the following modification:
+
+  As a special exception, the copyright holders of this library give you
+  permission to link this library with independent modules to produce an
+  executable, regardless of the license terms of these independent modules,and
+  to copy and distribute the resulting executable under terms of your choice,
+  provided that you also meet, for each linked independent module, the terms
+  and conditions of the license of that module. An independent module is a
+  module which is not derived from or based on this library. If you modify
+  this library, you may extend this exception to your version of the library,
+  but you are not obligated to do so. If you do not wish to do so, delete this
+  exception statement from your version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
+  for more details.
+
+  You should have received a copy of the GNU Library General Public License
+  along with this library; if not, write to the Free Software Foundation,
+  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+}
+
+unit exsortzeos;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, DB, RxDBGrid, ZAbstractRODataset;
+
+type
+
+  { TZeosDataSetSortEngine }
+
+  TZeosDataSetSortEngine = class(TRxDBGridSortEngine)
+  protected
+  public
+    procedure Sort(FieldName: string; ADataSet:TDataSet; Asc:boolean; SortOptions:TRxSortEngineOptions);override;
+    procedure SortList(ListField: string; ADataSet: TDataSet; Asc: array of boolean; SortOptions: TRxSortEngineOptions); override;
+  end;
+
+implementation
+uses ZDbcIntfs, ZVariant;
+
+function FixFieldName(S:string):string;inline;
+begin
+  if not IsValidIdent(S) then
+    Result:='"'+S+'"'
+  else
+    Result:=S;
+end;
+
+procedure TZeosDataSetSortEngine.Sort(FieldName: string; ADataSet: TDataSet;
+  Asc: boolean; SortOptions: TRxSortEngineOptions);
+begin
+  if not Assigned(ADataSet) then exit;
+
+  if ADataSet is TZAbstractRODataset then
+  begin
+    if Asc then
+      FieldName := FixFieldName(FieldName) + ' Asc'
+    else
+      FieldName := FixFieldName(FieldName) + ' Desc';
+    TZAbstractRODataset(ADataSet).SortedFields:=FieldName;
+{
+
+
+    if Asc then
+      TZAbstractRODataset(ADataSet).SortType:=stAscending
+    else
+      TZAbstractRODataset(ADataSet).SortType:=stDescending;}
+  end;
+end;
+
+procedure TZeosDataSetSortEngine.SortList(ListField: string;
+  ADataSet: TDataSet; Asc: array of boolean; SortOptions: TRxSortEngineOptions);
+var
+  S:string;
+  i, C:integer;
+begin
+  if not Assigned(ADataSet) then exit;
+
+  S:='';
+  C:=Pos(';', ListField);
+  i:=0;
+  while C>0 do
+  begin
+    if S<>'' then S:=S+';';
+    S:=S + FixFieldName(Copy(ListField, 1, C-1));
+    Delete(ListField, 1, C);
+
+    if (i<=High(Asc)) and (not Asc[i]) then
+      S:=S + ' DESC';
+    C:=Pos(';', ListField);
+    inc(i);
+  end;
+
+  if ListField<>'' then
+  begin
+    if S<>'' then S:=S+';';
+    S:=S + FixFieldName(ListField);
+    if (i<=High(Asc)) and (not Asc[i]) then
+      S:=S + ' DESC';
+  end;
+
+  (ADataSet as TZAbstractRODataset).SortedFields:=S;
+end;
+
+
+initialization
+  RegisterRxDBGridSortEngine(TZeosDataSetSortEngine, 'TZReadOnlyQuery');
+  RegisterRxDBGridSortEngine(TZeosDataSetSortEngine, 'TZQuery');
+  RegisterRxDBGridSortEngine(TZeosDataSetSortEngine, 'TZTable');
+  RegisterRxDBGridSortEngine(TZeosDataSetSortEngine, 'TZMacroQuery');
+end.
+