// @(#)root/base:$Id$
// Author: Valeriy Onuchin 04/27/2004

/*************************************************************************
 * Copyright (C) 1995-2001, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

//////////////////////////////////////////////////////////////////////////
//                                                                      //
// The Command design pattern is based on the idea, that all editing    //
// in an application is done by creating instances of command objects.  //
// Command objects apply changes to the edited object and then are      //
// stored  on a command stack. Furthermore, each command knows how to   //
// undo its changes to bring the edited object back to its previous     //
// state. As long as the application only uses command objects to       //
// change the state of the edited object, it is possible to undo        //
// a sequence of commands by traversing the command stack downwards and //
// calling the "undo" method of each command in turn. It is also        //
// possible to redo a sequence of commands by traversing the command    //
// stack upwards and calling the "redo" method of each command.         //
//                                                                      //
//                                                                      //
// Examples:                                                            //
//                                                                      //
// 1. Create a new command                                              //
//                                                                      //
// TQCommand *com = new TQCommand("TH1", hpx, "SetFillColor(Color_t)"   //
//                                "SetFillColor(Color_t)");             //
//                                                                      //
// 1st parameter - the name of class                                    //
// 2nd parameter - object                                               //
// 3rd parameter - the name of do/redo method                           //
// 4th parameter - the name of undo method                              //
//                                                                      //
// Since redo,undo methods are the same, undo name can be omitted, e.g. //
//                                                                      //
// TQCommand *com = new TQCommand("TH1", hpx, "SetFillColor(Color_t)"); //
//                                                                      //
// For objects derived from TObject class name can be omitted, e.g.     //
//                                                                      //
//    TQCommand *com = new TQCommand(hpx, "SetFillColor(Color_t)");     //
//                                                                      //
// 2. Setting undo, redo parameters.                                    //
//                                                                      //
//    Color_t old_color = hpx->GetFillColor();                          //
//    Color_t new_color = 4;  // blue color                             //
//                                                                      //
//    com->SetRedoArgs(1, new_color);                                   //
//    com->SetUndoArgs(1, old_color);                                   //
//                                                                      //
// 1st argument - the number of undo, redo parameters                   //
// the other arguments - undo, redo values                              //
//                                                                      //
// Since the number of undo,redo parameters is the same one can use     //
//                                                                      //
//    com->SetArgs(1, new_color, old_color);                            //
//                                                                      //
// 3. Undo, redo method execution                                       //
//                                                                      //
//    com->Redo(); // execute redo method                               //
//    com->Undo(); // execute undo method                               //
//                                                                      //
// 4. Merged commands                                                   //
//                                                                      //
// It possible to group several commands together so an end user        //
// can undo and redo them with one command.                             //
//                                                                      //
//    TQCommand *update = new TQCommand(gPad, "Modified()");            //
//    com->Add(update);                                                 //
//                                                                      //
// 5. Macro commands                                                    //
//                                                                      //
// "Merging" allows to create macro commands, e.g.                      //
//                                                                      //
//    TQCommand *macro = new TQCommand("my macro");                     //
//    macro->Add(com1);                                                 //
//    macro->Add(com2);                                                 //
//    ...                                                               //
//                                                                      //
// During Redo operation commands composing macro command are executed  //
// sequentially in direct  order (first in first out). During Undo,     //
// they are executed in reverse order (last in first out).              //
//                                                                      //
// 6. Undo manager.                                                     //
//                                                                      //
// TQUndoManager is recorder of undo and redo operations. This is       //
// command history list which can be traversed backwards and upwards    //
// performing undo and redo operations.                                 //
// To register command TQUndoManager::Add(TObject*) method is used.     //
//                                                                      //
//    TQUndoManager *history = new TQUndoManager();                     //
//    history->Add(com);                                                //
//                                                                      //
// TQUndoManager::Add automatically invokes execution of command's      //
// Redo method.                                                         //
//                                                                      //
// Use TQUndoManager::Undo to undo commands in  history list.           //
// Redo is Undo for undo action. Use TQUndoManager::Redo method for that//
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "Varargs.h"
#include "TQCommand.h"
#include "TQConnection.h"
#include "TDataType.h"
#include "stdarg.h"
#include "TROOT.h"

ClassImp(TQCommand)
ClassImp(TQUndoManager)

static TQCommand *gActiveCommand = 0;

////////////////////////////////////////////////////////////////////////////////
//______________________________________________________________________________
void TQCommand::Init(const char *clname, void *obj, const char *redo, const char *undo)
{
   // common protected method used in several constructors

   TString credo( CompressName(redo) );
   TString cundo( CompressName(undo) );

   fNRargs = fNUargs = -1;
   fNewDelete = kFALSE;
   fObject = obj;

   fRedo = redo ? new TQConnection(clname, obj, credo) : 0;
   fUndo = undo ? new TQConnection(clname, obj, cundo) : fRedo;

   fRedoArgs = 0;
   fUndoArgs = 0;
   fStatus = 0;
   fState = 0;

   if (!obj && !redo && !undo) { // macros
      fName = clname;
   }
}

//______________________________________________________________________________
TQCommand::TQCommand(const char *clname, void *obj, const char *redo,
                     const char *undo) : TList(), TQObject()
{
   // Constructor.
   //
   //   Input parameters:
   //     1. clname - class name.
   //     2. obj - an object
   //     3. redo - method or function to do/redo operation
   //     4. undo - method or function to undo operation
   //
   // Comments:
   //    - if either clname or obj is NULL that means that redo/undo is function
   //    - to specify default arguments for redo/undo method/function
   //       '=' must precede to argument value.
   //
   //  Example:
   //    TQCommand("TPad", gPad, "SetEditable(=kTRUE)", "SetEditable(=kFALSE)");
   //
   //    - undo method can be same as redo one. In that case undo parameter
   //       can be omitted.
   //
   //  Example:
   //    TQCommand("TPad", gPad, "SetFillStyle(Style_t)");

   Init(clname, obj, redo, undo);
}

//______________________________________________________________________________
TQCommand::TQCommand(TObject *obj, const char *redo, const char *undo) :
           TList(), TQObject()
{
   // Constructor.
   //
   //   Input parameters:
   //     1. obj - an object
   //     2. redo - method or function to do/redo operation
   //     3. undo - method or function to undo operation
   //
   // Comments:
   //    - to specify default arguments for redo/undo method/function
   //       '=' must precede to argument value.
   //
   //  Example:
   //    TQCommand(gPad, "SetEditable(=kTRUE)", "SetEditable(=kFALSE)");
   //
   //    - undo method can be same as redo one. In that case "undo"
   //       can parameter be omitted.
   //
   //  Example:
   //    TQCommand(gPad, "SetFillStyle(Style_t)");

   if (obj) Init(obj->ClassName(), obj, redo, undo);
   else Init(0, 0, redo, undo);
}

//______________________________________________________________________________
TQCommand::TQCommand(const TQCommand &com) : TList(), TQObject()
{
   // Copy constructor.

   fRedo = new TQConnection(*(com.fRedo));
   fUndo = new TQConnection(*(com.fUndo));

   fRedoArgs = 0;
   fUndoArgs = 0;
   fNRargs = com.fNRargs;
   fNUargs = com.fNUargs;

   if (fNRargs > 0) {
      fRedoArgs = new Long_t[fNRargs];
      for (int i = 0; i< fNRargs; i++) {
         fRedoArgs[i] = com.fRedoArgs[i];
      }
   }
   if (fNUargs > 0) {
      fUndoArgs = new Long_t[fNUargs];
      for (int i = 0; i < fNUargs; i++) {
         fUndoArgs[i] = com.fUndoArgs[i];
      }
   }
   fStatus = com.fStatus;
   fNewDelete = com.fNewDelete;
   fName = com.fName;
   fTitle = com.fTitle;
   fObject = com.fObject;
   fState = com.fState;

   // copy merged commands
   TIter next(&com);
   TQCommand *obj;
   while ((obj = (TQCommand*)next())) {
      TList::Add(new TQCommand(*obj));
   }
}

//______________________________________________________________________________
TQCommand::~TQCommand()
{
   // dtor.

   if (fRedo != fUndo) delete fUndo;

   delete fRedo;
   delete fRedoArgs;
   delete fUndoArgs;

   Delete();
}

//______________________________________________________________________________
TQCommand *TQCommand::GetCommand()
{
   // Return a command which is doing redo/undo action.
   //
   // This static method allows to set undo parameters dynamically, i.e.
   // during execution of Redo function.
   //
   // Example:
   //    For redo actions like TGTextEdit::DelChar() it is not possible to
   //    know ahead what character will be deleted.
   //    To set arguments for undo action ( e.g. TGTextEdit::InsChar(char)),
   //    one needs to call TQCommand::SetUndoArgs(1, character) from
   //    inside of TGTextEdit::DelChar() method, i.e.
   //
   //    TQCommand::GetCommand()->SetUndoArgs(1, somechar);

   return gActiveCommand;
}

//______________________________________________________________________________
void TQCommand::Delete(Option_t *opt)
{
   // If "opt" is not zero delete every merged command which option string is
   // equal to "opt". If "opt" is zero - delete all merged commands.

   if (!opt) {
      TList::Delete();
      return;
   }

   TObjLink *lnk = fFirst;
   TObjLink *sav;

   while (lnk) {
      sav = lnk->Next();
      TString ostr = lnk->GetOption();
      if (ostr.Contains(opt)) {   // remove command
         delete lnk->GetObject();
         Remove(lnk);
      }
      lnk = sav;
   }
}

//______________________________________________________________________________
Bool_t TQCommand::CanMerge(TQCommand *) const
{
   // Two commands can be merged if they can be composed into
   // a single command (Macro command).
   //
   // To allow merging commands user might override this function.

   return (!fRedo && !fUndo);
}

//______________________________________________________________________________
void TQCommand::Merge(TQCommand *c)
{
   // Add command to the list of merged commands.
   // This make it possible to group complex actions together so an end user
   // can undo and redo them with one command. Execution of TQUndoManager::Undo(),
   // TQUndoManager::Redo() methods only invokes the top level command as a whole.
   //
   // Merge method is analogous to logical join operation.
   //
   // Note:  Merge method invokes redo action.

   Add(c, "merge");
}

//______________________________________________________________________________
Long64_t TQCommand::Merge(TCollection *collection,TFileMergeInfo*)
{
   // Merge a collection of TQCommand.

   TIter next(collection);
   while (TObject* o = next()) {
      TQCommand *command = dynamic_cast<TQCommand*> (o);
      if (!command) {
         Error("Merge",
               "Cannot merge - an object which doesn't inherit from TQCommand found in the list");
         return -1;
      }
      Merge(command);
   }
   return GetEntries();
}

//______________________________________________________________________________
void TQCommand::Add(TObject *obj, Option_t *opt)
{
   // Add command to the list of merged commands.
   //
   // Option string can contain substrings:
   //  "compress" - try to compress input command
   //  "radd" - execute redo action of input command
   //  "uadd" - execute undo action of input command

   if (!obj->InheritsFrom(TQCommand::Class())) return;

   TQCommand *o = (TQCommand *)obj;
   TQCommand *c = (TQCommand *)Last();
   TString ostr = opt;

   if (c) {
      if (c->CanCompress(o) || (c->IsEqual(o) && ostr.Contains("compress"))) {
         c->Compress(o);
         return;
      }
   }
   TList::AddLast(o, opt);
   if (o->CanRedo() && ostr.Contains("radd")) o->Redo();
   if (o->CanUndo() && ostr.Contains("uadd")) o->Undo();
}

//______________________________________________________________________________
Bool_t TQCommand::CanCompress(TQCommand *c) const
{
   // By default, commands can be compressed if they are:
   //
   //  - equal
   //  - setter commands
   //
   // More complicated commands might want to override this function.

   return (IsEqual(c) && IsSetter());
}

//______________________________________________________________________________
void TQCommand::Compress(TQCommand *c)
{
   // Compress command. Compression is analogous to arithmetic "addition operation".
   //
   // Note:
   //    - The compressed command will be deleted.
   //    - Execution Compress method invokes Redo action with new redo arguments
   //      inheritied from compressed command.
   //
   // More complicated commands might want to override this function.

   for (int i = 0; i < fNRargs; i++) {
      fRedoArgs[i] = c->fRedoArgs[i];
   }
   Redo();
   fStatus--;   //do not change the state of command
   delete c;
}

//______________________________________________________________________________
Bool_t TQCommand::IsEqual(const TObject* obj) const
{
   // Equal comparison. The commands are equal if they are
   // applied to the same object and have the same Redo/Undo actions
   //
   // More complicated commands might want to override this function.

   if (!obj->InheritsFrom(TQCommand::Class())) return kFALSE;
   TQCommand *c = (TQCommand *)obj;
   if (!fRedo || !fUndo || (c->GetObject() != fObject)) return kFALSE;

   TString cname = fRedo->GetClassName();
   TString rname = fRedo->GetName();

   return ((cname == c->GetRedo()->GetClassName()) &&
           (rname == c->GetRedo()->GetName()));
}

//______________________________________________________________________________
Bool_t TQCommand::IsSetter() const
{
   // Returns kTRUE is command if Redo is the same as Undo function
   // and is the setter action.
   //
   // By default, all functions with names like "SetXXX" or "setXXX"
   // considered as setters. Another type of setters are Move, Resize operations
   //
   // More complicated commands might want to override this function.

   TString redo = GetRedoName();
   TString undo = GetUndoName();

   if (!redo || !undo || (redo != undo)) return kFALSE;

   return (redo.BeginsWith("Set") ||
           redo.BeginsWith("set") ||
           redo.BeginsWith("Move") ||
           redo.BeginsWith("move") ||
           redo.BeginsWith("Resize") ||
           redo.BeginsWith("resize"));
}

//______________________________________________________________________________
void TQCommand::SetArgs(Int_t narg, ...)
{
   // Set do/redo and undo parameters. The format is
   //    SetArgs(number_of_params, redo_params, undo_params)
   //
   // Example:
   //     move_command->SetArgs(2, 100, 100, 200, 200);
   //      2 params, (100,100) - do/redo position, (200,200) - undo position

   if (narg < 0) {
      return;
   } else if (!narg) {  // no arguments
      fNRargs = fNUargs = narg;
      return;
   }

   va_list ap;
   va_start(ap, narg);

   if (fNRargs != narg ) {
      delete fRedoArgs;
   }
   fRedoArgs = new Long_t[narg];

   if (fNUargs != narg ) {
      delete fUndoArgs;
   }
   fUndoArgs = new Long_t[narg];

   fNRargs = fNUargs = narg;

   Int_t i;
   for (i = 0; i < fNRargs; i++) {
      fRedoArgs[i] = va_arg(ap, Long_t);
   }
   for (i = 0; i < fNUargs; i++) {
      fUndoArgs[i] = va_arg(ap, Long_t);
   }
   va_end(ap);
}

//______________________________________________________________________________
void TQCommand::SetRedoArgs(Int_t narg, ...)
{
   // Set redo parameters. The format is
   //    SetRedoArgs(number_of_params, params)
   //
   // Example:
   //     move_command->SetRedoArgs(2, 100, 100);

   if (narg < 0) {
      return;
   } else if (!narg) {  // no arguments
      fNRargs = 0;
      return;
   }

   va_list ap;
   va_start(ap, narg);

   if (fNRargs != narg ) {
      delete fRedoArgs;
   }
   fRedoArgs = new Long_t[narg];

   fNRargs = narg;

   for (int i = 0; i < fNRargs; i++) {
      fRedoArgs[i] = va_arg(ap, Long_t);
   }
   va_end(ap);
}

//______________________________________________________________________________
void TQCommand::SetUndoArgs(Int_t narg, ...)
{
   // Set undo parameters. The format is
   //    SetUndoArgs(number_of_params, params)
   //
   // Example:
   //     move_command->SetUndoArgs(2, 200, 200);

   if (narg < 0) {
      return;
   } else if (!narg) {  // no arguments
      fNUargs = narg;
      return;
   }

   va_list ap;
   va_start(ap, narg);

   if (fNUargs != narg ) {
      delete fUndoArgs;
   }
   fUndoArgs = new Long_t[narg];

   fNUargs = narg;

   for (int i = 0; i < fNUargs; i++) {
      fUndoArgs[i] = va_arg(ap, Long_t);
   }
   va_end(ap);
}

//______________________________________________________________________________
Bool_t TQCommand::CanRedo() const
{
   // Returns kTRUE if Redo action is possible, kFALSE if it's not.
   // By default, only single sequential redo action is possible.

   return (fStatus <= 0);
}

//______________________________________________________________________________
Bool_t TQCommand::CanUndo() const
{
   // Returns kTRUE if Undo action is possible, kFALSE if it's not.
   // By default, only single tial undo action is possible.

   return (fStatus > 0);
}

//______________________________________________________________________________
void TQCommand::Redo(Option_t *)
{
   // Execute command and then smerged commands

   Bool_t done = kFALSE;
   fState = 1;

   gActiveCommand = this;

   if (fNRargs > 0) {
      if (fRedo) {
         fRedo->ExecuteMethod(fRedoArgs, fNRargs);
         done = kTRUE;
      }
   } else if (!fNRargs) {
      if (fRedo) {
         fRedo->ExecuteMethod();
         done = kTRUE;
      }
   }

   // execute merged commands
   TObjLink *lnk = fFirst;
   while (lnk) {
      TQCommand *c = (TQCommand *)lnk->GetObject();
      c->Redo();
      done = kTRUE;
      lnk = lnk->Next();
   }

   if (done) Emit("Redo()");
   fStatus++;
   fState = 0;
   gActiveCommand = 0;
}

//______________________________________________________________________________
void TQCommand::Undo(Option_t *)
{
   // Unexecute all merged commands and the command.
   // Merged commands are executed in reverse order.

   Bool_t done = kFALSE;
   fState = -1;

   gActiveCommand = this;

   // unexecute merged commands
   TObjLink *lnk = fLast;
   while (lnk) {
      TQCommand *c = (TQCommand *)lnk->GetObject();
      TString opt = lnk->GetOption();
      TObjLink *sav = lnk->Prev();
      c->Undo();
      done = kTRUE;
      if (opt.Contains("remove")) {   // remove  command
         delete lnk->GetObject();
         Remove(lnk);
      }
      lnk = sav;
   }
   if (fNUargs > 0) {
      if (fUndo) {
         fUndo->ExecuteMethod(fUndoArgs, fNUargs);
         done = kTRUE;
      }
   } else if (!fNUargs) {
      if (fUndo) {
         fUndo->ExecuteMethod();
         done = kTRUE;
      }
   }

   if (done) Emit("Undo()");
   fStatus--;
   fState = 0;
   gActiveCommand = 0;
}

//______________________________________________________________________________
const char *TQCommand::GetName() const
{
   // Returns the command name. Default name is "ClassName::RedoName(args)"
   // If list of merged commands is not empty the name is
   // "ClassName::RedoName(args):cname1:cname2 ..."

   const Int_t maxname = 100;

   if (!fName.IsNull()) return fName.Data();

   TString name;

   if (fRedo) {
      if (fRedo->GetClassName()) {
         name = fRedo->GetClassName();
      }
      name += "::";
      name += fRedo->GetName();
   }
   TQCommand *c;
   TObjLink *lnk = fFirst;

   while (lnk && (fName.Length() < maxname)) {
      c = (TQCommand *)lnk->GetObject();
      name += ":";
      name += c->GetName();
      lnk = lnk->Next();
   }

   // trick against "constness"
   TQCommand *m = (TQCommand *)this;
   m->fName = name;

   return name.Data();
}

//______________________________________________________________________________
const char *TQCommand::GetTitle() const
{
   // Returns command description.
   // By default, "ClassName::RedoName(args)_ClassName::UndoName(args)"

   if (!fTitle.IsNull()) return fTitle.Data();

   TString title = GetName();

   if (fUndo) {
      title += "_";
      title += fUndo->GetClassName();
      title += "::";
      if (fUndo->GetName())  title += fUndo->GetName();
   }
   return title.Data();
}

//______________________________________________________________________________
const char *TQCommand::GetRedoName() const
{
   // Returns the name of redo command

   return (fRedo ? fRedo->GetName() : 0);
}

//______________________________________________________________________________
const char *TQCommand::GetUndoName() const
{
   // Returns the name of undo command

   return (fUndo ? fUndo->GetName() : 0);
}

//______________________________________________________________________________
Long_t *TQCommand::GetRedoArgs() const
{
   // Returns a pointer to array of redo arguments

   return fRedoArgs;
}

//______________________________________________________________________________
Long_t *TQCommand::GetUndoArgs() const
{
   // Returns a pointer to array of undo arguments

   return fUndoArgs;
}

//______________________________________________________________________________
Int_t TQCommand::GetNRargs() const
{
   // Returns a number of redo arguments

   return fNRargs;
}

//______________________________________________________________________________
Int_t TQCommand::GetNUargs() const
{
   // Returns a number of undo arguments

   return fNUargs;
}

//______________________________________________________________________________
void *TQCommand::GetObject() const
{
   // Returns an object for which undo redo acions are applied

   return fObject;
}

//______________________________________________________________________________
Int_t TQCommand::GetStatus() const
{
   // Returns a number of sequential undo or redo operations

   return fStatus;
}

//______________________________________________________________________________
Bool_t TQCommand::IsMacro() const
{
   // Returns kTRUE if neither redo nor undo action specified

   return (!fRedo && !fUndo);
}

//______________________________________________________________________________
Bool_t TQCommand::IsUndoing() const
{
   // Undo action is in progress

   return (fState < 0);
}

//______________________________________________________________________________
Bool_t TQCommand::IsRedoing() const
{
   // Redo action is in progress

   return (fState > 0);
}

//______________________________________________________________________________
Bool_t TQCommand::IsExecuting() const
{
   // Returns kTRUE if command execution is in progress

   return fState;
}

//______________________________________________________________________________
void TQCommand::SetName(const char *name)
{
   // Sets name of the command

   fName = name;
}

//______________________________________________________________________________
void TQCommand::SetTitle(const char *title)
{
   // Sets description of the command

   fTitle = title;
}

//______________________________________________________________________________
void TQCommand::ls(Option_t *) const
{
   // ls this command and merged commands

   TString name = GetName();
   printf("%d %s\n", fStatus, name.Data());

   TObjLink *lnk = fFirst;
   while (lnk) {
      printf("\t");
      lnk->GetObject()->ls();
      lnk = lnk->Next();
   }
}

//______________________________________________________________________________
void TQCommand::PrintCollectionHeader(Option_t* /*option*/) const
{
   // Print collection header.

   TROOT::IndentLevel();
   printf("%d %s\n", fStatus, GetName());
}

///////////////////////////////////////////////////////////////////////////////
//______________________________________________________________________________
TQUndoManager::TQUndoManager() : TQCommand(0, 0, 0, 0)
{
   // Constructor

   fCursor = 0;
   fLimit = kMaxUInt;   // maximum value for UInt_t
   fLogging = kFALSE;
   fLogBook = 0;
   fCurrent = 0;
}

//______________________________________________________________________________
TQUndoManager::~TQUndoManager()
{
   // Destructor

   Delete();

   if (fLogBook) {
      delete fLogBook;
   }
}

//______________________________________________________________________________
void TQUndoManager::ls(Option_t *option) const
{
   // Lists all commands in stack

   if (!IsEmpty()) {
      TObjLink *lnk = fFirst;
      while (lnk) {
         if (lnk == fCursor) {
            printf("->");
         } else {
            printf("  ");
         }
         TQCommand *com = (TQCommand*)lnk->GetObject();
         com->ls(option);
         lnk = lnk->Next();
      }
   }
}

//______________________________________________________________________________
void TQUndoManager::PrintCollectionEntry(TObject* entry, Option_t* option,
                                         Int_t /*recurse*/) const
{
   // Print collection entry.

   TQCommand *com = (TQCommand*) entry;
   TROOT::IndentLevel();
   if (fCursor && fCursor->GetObject() == entry) {
      printf("->");
   } else {
      printf("  ");
   }
   com->ls(option);
}

//______________________________________________________________________________
void  TQUndoManager::SetLogging(Bool_t on)
{
   // Start logging. Delete all previous log records
   // Note: logging is not implemented yet

   fLogging = on;

   if (fLogging) {
      if (fLogBook) {
         fLogBook->Delete();
      } else {
         fLogBook = new TList();
      }
   }
}

//______________________________________________________________________________
void TQUndoManager::Add(TObject *obj, Option_t *opt)
{
   // Add command to the stack of commands.
   // Command's redo action will be executed.
   //
   // option string can contain the following substrings:
   //    "merge" - input command will be merged
   //    "compress" - input command will be compressed

   if (!obj->InheritsFrom(TQCommand::Class())) return;

   TQCommand *o = (TQCommand *)obj;
   TQCommand *c;
   Bool_t onredo = fCursor && fCursor->Next();
   TString ostr = onredo ? "1radd" : "0radd"; // execute redo on add
   if (opt) ostr += opt;

   if (fState) { // undo/redo in progress
      c = fCurrent;
      if (c) {
         fCurrent = o;
         c->Add(o, "remove");   // add nested command
      }
      return;
   }

   // delete all commands after cursor position
   if (fCursor && fCursor->Next()) {
      TObjLink *lnk = fCursor->Next();
      TObjLink *sav;
      while (lnk) {
         sav = lnk->Next();
         delete lnk->GetObject();
         Remove(lnk);
         lnk = sav;
      }
   }

   c = GetCursor();
   if (c) {
      if (c->CanCompress(o) || c->CanMerge(o) ||
          ostr.Contains("merge") || ostr.Contains("compress")) {
         fState = 1;
         c->Add(o, ostr.Data());
         fState = 0;
         return;
      }
   }

   TList::AddLast(obj, ostr.Data());
   fCursor = fLast;
   Redo(ostr.Data());

   if ((fSize > 0) && ((UInt_t)fSize > fLimit)) {
      Remove(fFirst);
   }
}

//______________________________________________________________________________
void TQUndoManager::CurrentChanged(TQCommand *c)
{
   // emit signal

   Emit("CurrentChanged(TQCommand*)", (long)c);
}

//______________________________________________________________________________
void TQUndoManager::Undo(Option_t *option)
{
   // Performs undo action. Move cursor position backward in history stack

   Bool_t done = kFALSE;
   if (!CanUndo()) return;

   TQCommand *sav = fCurrent;
   TQCommand *c = (TQCommand*)fCursor->GetObject();

   if (c->CanUndo()) {
      fState = -1;
      fCurrent = c;
      fCurrent->Undo(option);
      fState = 0;
      done = kTRUE;
      fCursor = fCursor->Prev() ? fCursor->Prev() : fFirst;
   } else {
      fCursor = fCursor->Prev();
      fCurrent = (TQCommand*)fCursor->GetObject();
      fState = -1;
      fCurrent->Undo(option);
      fState = 0;
      done = kTRUE;
   }
   if (done && fLogging && fLogBook) {
      fLogBook->Add(new TQCommand(*fCurrent));
   }
   if (sav != fCurrent) CurrentChanged(fCurrent);
}

//______________________________________________________________________________
void TQUndoManager::Redo(Option_t *option)
{
   // Performs redo action. Move cursor position forward in history stack

   Bool_t done = kFALSE;
   if (!CanRedo()) return;

   TQCommand *sav = fCurrent;
   TQCommand *c = (TQCommand*)fCursor->GetObject();

   if (c->CanRedo()) {
      fState = 1;
      fCurrent = c;
      fCurrent->Redo(option);
      fState = 0;
      done = kTRUE;
      fCursor = fCursor->Next() ? fCursor->Next() : fLast;
   } else {
      fCursor = fCursor->Next();
      fCurrent = (TQCommand*)fCursor->GetObject();
      fState = 1;
      fCurrent->Redo(option);
      fState = 0;
      done = kTRUE;
   }
   if (done && fLogging && fLogBook) {
      fLogBook->Add(new TQCommand(*fCurrent));
   }
   if (sav != fCurrent) CurrentChanged(fCurrent);
}

//______________________________________________________________________________
Bool_t TQUndoManager::CanRedo() const
{
   // Returns kTRUE if redo action is possible

   if (!fCursor) return kFALSE;

   TQCommand *c = (TQCommand*)fCursor->GetObject();
   if (c->CanRedo()) return kTRUE;

   c = fCursor->Next() ? (TQCommand*)fCursor->Next()->GetObject() : 0;
   return (c && c->CanRedo());
}

//______________________________________________________________________________
Bool_t TQUndoManager::CanUndo() const
{
   // Returns kTRUE if undo action is possible

   if (!fCursor) return kFALSE;

   TQCommand *c = (TQCommand*)fCursor->GetObject();
   if (c->CanUndo()) return kTRUE;

   c = fCursor->Prev() ? (TQCommand*)fCursor->Prev()->GetObject() : 0;
   return (c && c->CanUndo());
}

//_____________________________________________________________________________
Bool_t TQUndoManager::IsLogging() const
{
   // Returns kTRUE if logging is ON

   return fLogging;
}

//_____________________________________________________________________________
TQCommand *TQUndoManager::GetCurrent() const
{
   // Returns the last executed command

   return fCurrent;
}

//_____________________________________________________________________________
TQCommand *TQUndoManager::GetCursor() const
{
   // Returns a command correspondent to the current cursor position in stack

   return (TQCommand*)(fCursor ? fCursor->GetObject() : 0);
}

//_____________________________________________________________________________
void TQUndoManager::SetLimit(UInt_t limit)
{
   // Returns a maximum number of commands which could be located in stack

   fLimit = limit;
}

//_____________________________________________________________________________
UInt_t TQUndoManager::GetLimit() const
{
   // Returns a maximum number of commands which  could be located in stack

   return fLimit;
}
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