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+{ RXHistory unit
+
+  Copyright (C) 2005-2017 Lagunov Aleksey alexs75@yandex.ru and Lazarus team
+  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 RXHistory;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs,
+  rxtoolbar;
+
+type
+  TToolbarButtonStyleCntrl = (tbrcNotChange, tbrcDropDown, tbrcDropDownExtra);
+
+  PNavigateRec = ^TNavigateRec;
+  TNavigateRec = packed record
+    Name:string;
+    Cond:string;
+    Next:PNavigateRec;
+  end;
+
+  TOnNavigateEvent = procedure(Sender:TObject; const EventName, EventMacro:string) of object;
+  { TRXHistory }
+
+  TRXHistory = class(TComponent)
+  private
+    FButtonNext: string;
+    FButtonPrior: string;
+    FButtonStyle: TToolbarButtonStyleCntrl;
+    FNextButton: TToolbarItem;
+    FNextButtonName: string;
+    FOnNavigateEvent: TOnNavigateEvent;
+    FPriorButton: TToolbarItem;
+    FPriorButtonName: string;
+    FToolPanel: TToolPanel;
+    function GetNextButtonName: string;
+    function GetPriorButtonName: string;
+    procedure SetButtonStyle(const AValue: TToolbarButtonStyleCntrl);
+    procedure SetNextButtonName(const AValue: string);
+    procedure SetPriorButtonName(const AValue: string);
+    procedure SetToolPanel(const AValue: TToolPanel);
+    function SetBtn(const ABtnName: string;var Button:TToolbarItem):boolean;
+  protected
+    procedure Loaded; override;
+  public
+    constructor Create(AOwner: TComponent); override;
+    property PriorButton:TToolbarItem read FPriorButton;
+    property NextButton:TToolbarItem read FNextButton;
+  published
+    property ToolPanel:TToolPanel read FToolPanel write SetToolPanel;
+    property PriorButtonName:string read GetPriorButtonName write SetPriorButtonName;
+    property NextButtonName:string read GetNextButtonName write SetNextButtonName;
+    property ButtonStyle:TToolbarButtonStyleCntrl read FButtonStyle write SetButtonStyle default tbrcNotChange;
+    property OnNavigateEvent:TOnNavigateEvent read FOnNavigateEvent write FOnNavigateEvent;
+  end;
+
+procedure Register;
+
+implementation
+uses PropEdits, Componenteditors, TypInfo;
+
+type
+
+  { TTRXHistoryBtnNameProperty }
+
+  TTRXHistoryBtnNameProperty = class(TStringPropertyEditor)
+  public
+    function  GetAttributes: TPropertyAttributes; override;
+    procedure GetValues(Proc: TGetStrProc); override;
+  end;
+
+{ TTRXHistoryBtnNameProperty }
+
+function TTRXHistoryBtnNameProperty.GetAttributes: TPropertyAttributes;
+begin
+  Result:=inherited GetAttributes;
+  Result:=Result + [paValueList, paSortList, paMultiSelect];
+end;
+
+procedure TTRXHistoryBtnNameProperty.GetValues(Proc: TGetStrProc);
+var
+  ToolPanel:TToolPanel;
+  i:integer;
+begin
+  ToolPanel := GetObjectProp(GetComponent(0), 'ToolPanel') as TToolPanel;
+  if Assigned(ToolPanel) then
+    for I := 0 to ToolPanel.Items.Count - 1 do
+    begin
+      if Assigned(ToolPanel.Items[i].Action) then
+       Proc(ToolPanel.Items[i].Action.Name);
+    end;
+end;
+
+procedure Register;
+begin
+  RegisterComponents('RX',[TRXHistory]);
+
+  RegisterPropertyEditor(TypeInfo(string), TRXHistory, 'PriorButtonName', TTRXHistoryBtnNameProperty);
+  RegisterPropertyEditor(TypeInfo(string), TRXHistory, 'NextButtonName', TTRXHistoryBtnNameProperty);
+end;
+
+{ TRXHistory }
+
+procedure TRXHistory.SetToolPanel(const AValue: TToolPanel);
+begin
+  if FToolPanel=AValue then exit;
+  FToolPanel:=AValue;
+end;
+
+function TRXHistory.SetBtn(const ABtnName: string;var Button:TToolbarItem):boolean;
+var
+  i:integer;
+begin
+  Result:=false;
+  if not Assigned(FToolPanel) then exit;
+  Button:=FToolPanel.Items.ByActionName[ABtnName];
+  Result:=Assigned(Button);
+  if Result then
+  begin
+    case FButtonStyle of
+      tbrcDropDown:Button.ButtonStyle:=tbrDropDown;
+      tbrcDropDownExtra:Button.ButtonStyle:=tbrDropDownExtra;
+    end;
+  end;
+end;
+
+procedure TRXHistory.Loaded;
+begin
+  inherited Loaded;
+  if not SetBtn(FNextButtonName, FNextButton) then
+    FNextButtonName:='';
+  if not SetBtn(FPriorButtonName, FPriorButton) then
+    FPriorButtonName:='';
+end;
+
+constructor TRXHistory.Create(AOwner: TComponent);
+begin
+  inherited Create(AOwner);
+  FButtonStyle:=tbrcNotChange;
+end;
+
+procedure TRXHistory.SetNextButtonName(const AValue: string);
+begin
+  if FNextButtonName=AValue then exit;
+  if csLoading in ComponentState then
+    FNextButtonName:=AValue
+  else
+  begin
+    if SetBtn(AValue, FNextButton) then
+      FNextButtonName:=AValue
+    else
+      FNextButtonName:='';
+  end;
+end;
+
+procedure TRXHistory.SetButtonStyle(const AValue: TToolbarButtonStyleCntrl);
+begin
+  if FButtonStyle=AValue then exit;
+  FButtonStyle:=AValue;
+end;
+
+function TRXHistory.GetNextButtonName: string;
+begin
+  if Assigned(NextButton) and Assigned(NextButton.Action) then
+    Result:=NextButton.Action.Name
+  else
+    Result:='';
+end;
+
+function TRXHistory.GetPriorButtonName: string;
+begin
+  if Assigned(PriorButton) and Assigned(PriorButton.Action) then
+    Result:=PriorButton.Action.Name
+  else
+    Result:='';
+end;
+
+procedure TRXHistory.SetPriorButtonName(const AValue: string);
+begin
+  if FPriorButtonName=AValue then exit;
+  if csLoading in ComponentState then
+    FPriorButtonName:=AValue
+  else
+  begin
+    if SetBtn(AValue, FPriorButton) then
+      FPriorButtonName:=AValue
+    else
+      FPriorButtonName:='';
+  end;
+end;
+
+end.