source: trunk/MagicSoft/Mars/mbase/MStatusDisplay.cc@ 5666

/* ======================================================================== *\
!
! *
! * This file is part of MARS, the MAGIC Analysis and Reconstruction
! * Software. It is distributed to you in the hope that it can be a useful
! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
! * It is distributed WITHOUT ANY WARRANTY.
! *
! * Permission to use, copy, modify and distribute this software and its
! * documentation for any purpose is hereby granted without fee,
! * provided that the above copyright notice appear in all copies and
! * that both that copyright notice and this permission notice appear
! * in supporting documentation. It is provided "as is" without express
! * or implied warranty.
! *
!
!
!   Author(s): Thomas Bretz, 4/2003 <mailto:tbretz@astro.uni-wuerzburg.de>
!
!   Copyright: MAGIC Software Development, 2003-2004
!
!
\* ======================================================================== */

/////////////////////////////////////////////////////////////////////////////
//
// MStatusDisplay
//
// This status display can be used (and is used) to display results in
// a tabbed window. The window can be written to and read from a root file
// (see Read and Write) or printed as a postscript file (see SaveAsPS).
//
// To write gif files of C-Macros use SaveAsGif() or SaveAsC().
// Direct printing to the default printer (via lpr) can be done by
// PrintToLpr().
//
// It has also to half status lines which can be used to display the status
// or something going on. Together with the status lines it has a progress
// bar which can display the progress of a job or loop.
// Access the progress bar by GetProgressBar()
//
// To add a new tab and get a pointer to the newly created TCanvas
// use AddTab.
//
// If you have a MStatusDisplay and you are not sure whether it was
// destroyed by the user meanwhile use:
//   gROOT->GetListOfSpecials()->FindObject(pointer);
// Each MStatusDisplay is added to list list by its constructor and
// removed from the list by the destructor.
//
// You can redirect an output to a MLog-logstream by calling SetLogStream().
// To disable redirction call SetLogStream(NULL)
//
// Because updates to the tabs are only done/displayed if a tab is active
// using the gui doesn't make things slower (<1%) if the first (legend
// tab) is displayed. This gives you the possibility to look into
// the current progress of a loop without loosing more time than the
// single update of the tab.
//
/////////////////////////////////////////////////////////////////////////////
#include "MStatusDisplay.h"

#include <fstream>                // fstream

#include <TLine.h>                // TLine
#include <TText.h>                // TText
#include <TFile.h>                // gFile
#include <TFrame.h>               // TFrame
#include <TStyle.h>               // gStyle
#include <TCanvas.h>              // TCanvas
#include <TSystem.h>              // gSystem
#include <TDatime.h>              // TDatime
#include <TRandom.h>              // TRandom
#include <TThread.h>              // TThread::Self()
#include <TBrowser.h>             // TBrowser
#include <TObjArray.h>            // TObjArray
#include <TPostScript.h>          // TPostScript
#include <TMethodCall.h>          // TMethodCall

//#include <TRint.h>                // gApplication, TRint::Class()
#include <TInterpreter.h>         // gInterpreter

#include <TGTab.h>                // TGTab
#include <TGLabel.h>              // TGLabel
#include <TG3DLine.h>             // TGHorizontal3DLine
#include <TGButton.h>             // TGPictureButton
#include <TGTextView.h>           // TGTextView
#include <TGComboBox.h>           // TGComboBox
#include <TGStatusBar.h>          // TGStatusBar
#include <TGFileDialog.h>         // TGFileDialog
#include <TGProgressBar.h>        // TGHProgressBar
#include <TRootEmbeddedCanvas.h>  // TRootEmbeddedCanvas

#include "MLog.h"                 // MLog
#include "MLogManip.h"            // inf, warn, err

#include "MGList.h"               // MGList
#include "MGMenu.h"               // MGMenu, TGMenu
#include "MSearch.h"              // MSearch
#include "MParContainer.h"        // MParContainer::GetDescriptor
#include "MStatusArray.h"         // MStatusArray

#undef DEBUG
//#define DEBUG

ClassImp(MStatusDisplay);

using namespace std;

// ------------ Workaround for a non working TGTextView::Search -------------
#if ROOT_VERSION_CODE < ROOT_VERSION(3,02,05)
class MGTextView : public TGTextView
{
public:
    MGTextView(const TGWindow *parent, UInt_t w, UInt_t h, Int_t id = -1,
               UInt_t sboptions = 0, ULong_t back = GetWhitePixel()) :
    TGTextView(parent, w, h, id, sboptions, back) {}
    MGTextView(const TGWindow *parent, UInt_t w, UInt_t h, TGText *text,
               Int_t id = -1, UInt_t sboptions = 0, ULong_t back = GetWhitePixel()) :
    TGTextView(parent, w, h, text, id, sboptions, back) {}
    MGTextView(const TGWindow *parent, UInt_t w, UInt_t h, const char *string,
               Int_t id = -1, UInt_t sboptions = 0, ULong_t back = GetWhitePixel()) :
    TGTextView(parent, w, h, string, id, sboptions, back) {}

    void Mark(Long_t xPos, Long_t yPos) { TGTextView::Mark(xPos, yPos); }
    void UnMark()                       { TGTextView::UnMark(); }

    Bool_t Search(const char *string, Bool_t direction, Bool_t caseSensitive)
    {
        // Taken from TGTextView::Search and modified.

        TGLongPosition pos, pos2;
        pos2.fX = pos2.fY = 0;
        if (fIsMarked) {
            if (!direction)
            {
                pos2.fX = fMarkedStart.fX;
                pos2.fY = fMarkedStart.fY;
            }
            else
            {
                pos2.fX = fMarkedEnd.fX + 1;
                pos2.fY = fMarkedEnd.fY;
            }
        }
        if (!fText->Search(&pos, pos2, string, direction, caseSensitive))
            return kFALSE;
        UnMark();
        fIsMarked = kTRUE;
        fMarkedStart.fY = fMarkedEnd.fY = pos.fY;
        fMarkedStart.fX = pos.fX;
        fMarkedEnd.fX = fMarkedStart.fX + strlen(string);
        pos.fY = ToObjYCoord(fVisible.fY);
        if ((fMarkedStart.fY < pos.fY) ||
            (ToScrYCoord(fMarkedStart.fY) >= (Int_t)fCanvas->GetHeight()))
            pos.fY = fMarkedStart.fY;
        pos.fX = ToObjXCoord(fVisible.fX, pos.fY);
        if ((fMarkedStart.fX < pos.fX) ||
            (ToScrXCoord(fMarkedStart.fX, pos.fY) >= (Int_t)fCanvas->GetWidth()))
            pos.fX = fMarkedStart.fX;

        SetVsbPosition((ToScrYCoord(pos.fY) + fVisible.fY)/fScrollVal.fY);
        SetHsbPosition((ToScrXCoord(pos.fX, pos.fY) + fVisible.fX)/fScrollVal.fX);
        DrawRegion(0, (Int_t)ToScrYCoord(fMarkedStart.fY), fCanvas->GetWidth(),
                   UInt_t(ToScrYCoord(fMarkedEnd.fY+1) - ToScrYCoord(fMarkedEnd.fY)));

        return kTRUE;
    }
};
#else
#define MGTextView TGTextView
#endif

// --------------------------------------------------------------------------

// --------------------------------------------------------------------------
//
// Add menu bar to the GUI
//
void MStatusDisplay::AddMenuBar()
{
    //
    // File Menu
    //
    MGPopupMenu *filemenu = new MGPopupMenu(gClient->GetRoot());
    // filemenu->AddEntry("Save &As...", kFileSaveAs);
    filemenu->AddEntry("New Can&vas",   kFileCanvas);
    filemenu->AddEntry("New &Browser",  kFileBrowser);
    filemenu->AddSeparator();
    filemenu->AddEntry("Save As status.&ps",   kFileSaveAsPS);
    filemenu->AddEntry("Save As status.&gif",  kFileSaveAsGIF);
    filemenu->AddEntry("Save As status.&C",    kFileSaveAsC);
    filemenu->AddEntry("Save As status.&root", kFileSaveAsRoot);
    filemenu->AddSeparator();
    filemenu->AddEntry("&Open...",             kFileOpen);
    filemenu->AddEntry("Save &As...",          kFileSaveAs);
    filemenu->AddSeparator();
    filemenu->AddEntry("Re&set",               kFileReset);
    filemenu->AddSeparator();
    filemenu->AddEntry("Print with &lpr",      kFilePrint);
    //filemenu->AddEntry("Set printer &name",    kFilePrinterName);
    filemenu->AddSeparator();
    filemenu->AddEntry("C&lose", kFileClose);
    filemenu->AddEntry("E&xit", kFileExit);
    filemenu->Associate(this);

    //
    // Tab Menu
    //
    MGPopupMenu *tabmenu = new MGPopupMenu(gClient->GetRoot());
    tabmenu->AddEntry("Next [&+]",           kTabNext);
    tabmenu->AddEntry("Previous [&-]",       kTabPrevious);
    tabmenu->AddSeparator();
    tabmenu->AddEntry("Save As tab-i.&ps",   kTabSaveAsPS);
    tabmenu->AddEntry("Save As tab-i.&gif",  kTabSaveAsGIF);
    tabmenu->AddEntry("Save As tab-i.&C",    kTabSaveAsC);
    tabmenu->AddEntry("Save As tab-i.&root", kTabSaveAsRoot);
    tabmenu->AddSeparator();
    tabmenu->AddEntry("Save &As...",         kTabSaveAs);
    tabmenu->AddSeparator();
    tabmenu->AddEntry("Re&move",             kTabRemove);
    tabmenu->AddSeparator();
    tabmenu->AddEntry("Print with &lpr",     kTabPrint);
    tabmenu->Associate(this);

    //
    // Loop Menu
    //
    MGPopupMenu *loopmenu = new MGPopupMenu(gClient->GetRoot());
    loopmenu->AddEntry("&Stop", kLoopStop);
    loopmenu->Associate(this);

    //
    // Loop Menu
    //
    MGPopupMenu *sizemenu = new MGPopupMenu(gClient->GetRoot());
    sizemenu->AddEntry("Fit to 640x&480",   kSize640);
    sizemenu->AddEntry("Fit to 800x&600",   kSize800);
    sizemenu->AddEntry("Fit to 960x7&20",   kSize960);
    sizemenu->AddEntry("Fit to 1024x&768",  kSize1024);
    sizemenu->AddEntry("Fit to 1280x&1024", kSize1280);
    sizemenu->Associate(this);

    //
    // Log Menu
    //
    MGPopupMenu *logmenu = new MGPopupMenu(gClient->GetRoot());
    logmenu->AddEntry("&Copy Selected", kLogCopy);
    logmenu->AddEntry("Cl&ear all",     kLogClear);
    logmenu->AddSeparator();
    logmenu->AddEntry("Select &All",    kLogSelect);
    logmenu->AddSeparator();
    logmenu->AddEntry("&Find...",       kLogFind);
    logmenu->AddSeparator();
    logmenu->AddEntry("&Save",          kLogSave);
    logmenu->AddEntry("Save &append",   kLogAppend);
    logmenu->Associate(this);

    //
    // Menu Bar
    //
    TGLayoutHints *layitem = new TGLayoutHints(kLHintsNormal, 0, 4, 0, 0);
    fList->Add(layitem);

    MGMenuBar *menubar = new MGMenuBar(this, 1, 1, kHorizontalFrame);
    menubar->AddPopup("&File", filemenu, layitem);
    menubar->AddPopup("Lo&g",  logmenu,  layitem);
    menubar->AddPopup("&Size", sizemenu, layitem);
    menubar->AddPopup("&Tab",  tabmenu,  layitem);
    menubar->AddPopup("&Loop", loopmenu, layitem);
    menubar->BindKeys(this);
    AddFrame(menubar);

    //
    // Line below menu bar
    //
    TGLayoutHints *laylinesep  = new TGLayoutHints(kLHintsTop|kLHintsExpandX);
    fList->Add(laylinesep);

    TGHorizontal3DLine *linesep = new TGHorizontal3DLine(this);
    AddFrame(linesep, laylinesep);

    //
    // Add everything to autodel list
    //
    fList->Add(filemenu);
    fList->Add(loopmenu);
    fList->Add(sizemenu);
    fList->Add(menubar);
    fList->Add(tabmenu);
    fList->Add(logmenu);
    fList->Add(linesep);
}

// --------------------------------------------------------------------------
//
// Adds an empty TGCompositeFrame which might be filled by the user
//
void MStatusDisplay::AddUserFrame()
{
    TGLayoutHints *lay=new TGLayoutHints(kLHintsExpandX);
    fList->Add(lay);

    fUserFrame = new TGCompositeFrame(this, 1, 1);
    AddFrame(fUserFrame, lay);
    fList->Add(fUserFrame);
}

char *rot128(char *c)
{
    char *rc=c;
    while (*c) *c++ += 128;
    return rc;
}

// --------------------------------------------------------------------------
//
// Add the title tab
//
void MStatusDisplay::AddMarsTab()
{
    // Create Tab1
    TGCompositeFrame *f = fTab->AddTab("-=MARS=-");

    // Add list of tabs

    TGComboBox *filter = new TGComboBox(f, kTabs);
    fList->Add(filter);
    filter->Associate(this);
    filter->AddEntry("-=MARS=-", 0);
    filter->Select(0);

    TGLayoutHints *lay3 = new TGLayoutHints(kLHintsCenterX|kLHintsTop, 10, 10, 10, 5);
    fList->Add(lay3);
    f->AddFrame(filter, lay3);

    // Add MARS version
    TGLabel *l = new TGLabel(f, Form("Official Release: V%s", MARSVER));
    fList->Add(l);

    filter->SetWidth(l->GetWidth());
    filter->SetHeight(4*l->GetHeight()/3);

    TGLayoutHints *layb = new TGLayoutHints(kLHintsCenterX|kLHintsTop, 10, 10, 5, 5);
    fList->Add(layb);
    f->AddFrame(l, layb);

    // Add root version
    l = new TGLabel(f, Form("Using ROOT v%s", ROOTVER));
    fList->Add(l);

    TGLayoutHints *lay = new TGLayoutHints(kLHintsCenterX|kLHintsTop);
    fList->Add(lay);
    f->AddFrame(l, lay);

    // Add Mars logo picture
    const TGPicture *pic2 = fList->GetPicture("marslogo.xpm");
    if (pic2)
    {
        TGPictureButton *mars  = new TGPictureButton(f, pic2, kPicMars);
        fList->Add(mars);
        mars->Associate(this);

        TGLayoutHints *lay2 = new TGLayoutHints(kLHintsCenterX|kLHintsCenterY, 10, 10, 5, 5);
        fList->Add(lay2);
        f->AddFrame(mars, lay2);
    }

    // Add date and time
    TDatime d;
    l = new TGLabel(f, d.AsString());
    fList->Add(l);
    f->AddFrame(l, lay);

    // Add copyright notice
    l = new TGLabel(f, "(c) MAGIC Software Development, 2000-2004");
    fList->Add(l);
    f->AddFrame(l, layb);

    TGLayoutHints *layc = new TGLayoutHints(kLHintsCenterX|kLHintsTop, 10, 10, 0, 5);
    fList->Add(layc);

    char *txt = "<< Thomas Bretz >>";
    l = new TGLabel(f, txt);
    fList->Add(l);
    f->AddFrame(l, layc);
}

// --------------------------------------------------------------------------
//
// Adds the logbook tab to the GUI if it was not added previously.
//
// The logbook is updated four times a second only if the tab is visible.
//
// You can redirect an output to a MLog-logstream by calling SetLogStream().
// To disable redirction call SetLogStream(NULL)
//
// if enable==kFALSE the stdout is disabled/enabled. Otherwise stdout
// is ignored.
//
void MStatusDisplay::SetLogStream(MLog *log, Bool_t enable)
{
    if (gROOT->IsBatch())
        return;

    if (log && fLogBox==NULL)
    {
        fLogIdx = fTab->GetNumberOfTabs();

        // Create Tab1
        TGCompositeFrame *f = AddRawTab("-Logbook-");//fTab->AddTab("-Logbook-");

        // Create Text View
        fLogBox = new MGTextView(f, 1, 1); // , -1, 0, TGFrame::GetDefaultFrameBackground());
        if (fFont)
            fLogBox->SetFont(fFont);
        //fLogBox->Associate(this);

        // Add List box to the tab
        TGLayoutHints *lay = new TGLayoutHints(kLHintsNormal|kLHintsExpandX|kLHintsExpandY,2,2,2,2);
        f->AddFrame(fLogBox, lay);

        // layout and map tab
        Layout();
        MapSubwindows();

        // make it visible
        // FIXME: This is a workaround, because TApplication::Run is not
        //        thread safe against ProcessEvents. We assume, that if
        //        we are not in the Main-Thread ProcessEvents() is
        //        called by the TApplication Event Loop...
        if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
            gClient->ProcessEventsFor(fTab);
    }

    if (log)
    {
        fLog = log;

        log->SetOutputGui(fLogBox, kTRUE);
        log->EnableOutputDevice(MLog::eGui);
        if (!enable)
            log->DisableOutputDevice(MLog::eStdout);

        fLogTimer.Start();
    }
    else
    {
        fLogTimer.Stop();

        fLog->DisableOutputDevice(MLog::eGui);
        fLog->SetOutputGui(NULL);
        if (!enable)
            fLog->EnableOutputDevice(MLog::eStdout);

        fLog = &gLog;
    }
}

// --------------------------------------------------------------------------
//
// Add the Tabs and the predifined Tabs to the GUI
//
void MStatusDisplay::AddTabs()
{
    fTab = new TGTab(this, 300, 300);

    AddMarsTab();

    // Add fTab to Frame
    TGLayoutHints *laytabs = new TGLayoutHints(kLHintsNormal|kLHintsExpandX|kLHintsExpandY, 5, 5, 5);
    AddFrame(fTab, laytabs);

    fList->Add(fTab);
    fList->Add(laytabs);
}

// --------------------------------------------------------------------------
//
// Add the progress bar to the GUI. The Progress Bar range is set to
// (0,1) as default.
//
void MStatusDisplay::AddProgressBar()
{
    TGLayoutHints *laybar=new TGLayoutHints(kLHintsExpandX, 5, 5, 5, 5);
    fList->Add(laybar);

    fBar=new TGHProgressBar(this);
    fBar->SetRange(0, 1);
    fBar->ShowPosition();
    AddFrame(fBar, laybar);
    fList->Add(fBar);
}

// --------------------------------------------------------------------------
//
// Set the progress bar position between 0 and 1. The Progress bar range
// is assumed to be (0,1)
//
void MStatusDisplay::SetProgressBarPosition(Float_t p)
{
    fBar->SetPosition(p);
}

// --------------------------------------------------------------------------
//
// Adds the status bar to the GUI
//
void MStatusDisplay::AddStatusBar()
{
    fStatusBar = new TGStatusBar(this, 1, 1);

    //
    // Divide it like the 'Golden Cut' (goldener Schnitt)
    //
    //     1-a     a
    // 1: ------|----
    //
    // a/(1-a) = (1-a)/1
    // a^2+a-1 = 0
    //       a = (-1+-sqrt(1+4))/2 = sqrt(5)/2-1/2 = 0.618
    //
    Int_t p[2] = {38, 62};

    fStatusBar->SetParts(p, 2);

    TGLayoutHints *layb = new TGLayoutHints(kLHintsNormal|kLHintsExpandX, 5, 4, 0, 3);
    AddFrame(fStatusBar, layb);

    fList->Add(fStatusBar);
    fList->Add(layb);
}

// --------------------------------------------------------------------------
//
// Change the text in the status line 1
//
void MStatusDisplay::SetStatusLine1(const char *txt)
{
    if (gROOT->IsBatch())
        return;
    fStatusBar->SetText(txt, 0);

    // FIXME: This is a workaround, because TApplication::Run is not
    //        thread safe against ProcessEvents. We assume, that if
    //        we are not in the Main-Thread ProcessEvents() is
    //        called by the TApplication Event Loop...
    if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
        gClient->ProcessEventsFor(fStatusBar);
}

// --------------------------------------------------------------------------
//
// Change the text in the status line 2
//
void MStatusDisplay::SetStatusLine2(const char *txt)
{
    if (gROOT->IsBatch())
        return;

    fStatusBar->SetText(txt, 1);

    // FIXME: This is a workaround, because TApplication::Run is not
    //        thread safe against ProcessEvents. We assume, that if
    //        we are not in the Main-Thread ProcessEvents() is
    //        called by the TApplication Event Loop...
    if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
        gClient->ProcessEventsFor(fStatusBar);
}

// --------------------------------------------------------------------------
//
// Display information about the name of a container
//
void MStatusDisplay::SetStatusLine2(const MParContainer &cont)
{
    SetStatusLine2(Form("%s: %s", cont.GetDescriptor(), cont.GetTitle()));
}

// --------------------------------------------------------------------------
//
// Default constructor. Opens a window with a progress bar. Get a pointer
// to the bar by calling GetBar. This pointer can be used for the
// eventloop.
//
// Be carefull: killing or closing the window while the progress meter
//   is still in use may cause segmentation faults. Please kill the window
//   always by deleting the corresponding object.
//
// Update time default: 10s
//
MStatusDisplay::MStatusDisplay(Long_t t)
: TGMainFrame(NULL, 1, 1), fName("MStatusDisplay"), fLog(&gLog), fTab(NULL), fTimer(this, t, kTRUE), fStatus(kLoopNone), fLogIdx(-1), fLogTimer(this, 250, kTRUE), fLogBox(NULL), fIsLocked(0)
{
    // p==NULL means: Take gClient->GetRoot() if not in batch mode
    // see TGWindow::TGWindow()

    //
    // This is a possibility for the user to check whether this
    // object has already been deleted. It will be removed
    // from the list in the destructor.
    //
    gROOT->GetListOfSpecials()->Add(this);

    fFont = gVirtualX->LoadQueryFont("7x13bold");
    fMutex = new TMutex;

    //
    // In case we are in batch mode use a list of canvases
    // instead of the Root Embedded Canvases in the TGTab
    //
    fBatch = new TList;
    fBatch->SetOwner();

    //
    // Create a list handling GUI widgets
    //
    fList = new MGList;
    fList->SetOwner();

    //
    // Create the layout hint for the root embedded canavses
    //
    fLayCanvas = new TGLayoutHints(kLHintsExpandX|kLHintsExpandY);
    fList->Add(fLayCanvas);

    //
    // Add Widgets (from top to bottom)
    //
    if (gClient) // BATCH MODE
    {
        AddMenuBar();
        AddUserFrame();
        AddTabs();
        AddProgressBar();
        AddStatusBar();
    }

    //
    // set the smallest and biggest size of the Main frame
    // and move it to its appearance position
    SetWMSizeHints(570, 480, 1280, 980, 1, 1);
    MoveResize(rand()%100+570, rand()%100+480, 570, 480);

    //
    // Now do an automatic layout of the widgets and display the window
    //
    Layout();
    MapSubwindows();

    SetWindowName("Status Display");
    SetIconName("Status Display");

    MapWindow();

    // FIXME: This is a workaround, because TApplication::Run is not
    //        thread safe against ProcessEvents. We assume, that if
    //        we are not in the Main-Thread ProcessEvents() is
    //        called by the TApplication Event Loop...
    if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
        gSystem->ProcessEvents();
}

// --------------------------------------------------------------------------
//
// Destruct the window with all its tiles. Also the Progress Bar object
// is deleted.
//
MStatusDisplay::~MStatusDisplay()
{
#if ROOT_VERSION_CODE < ROOT_VERSION(3,10,01)
    fTab = NULL; // See HandleEvent
#endif

    //
    // Delete object from global object table so it cannot
    // be deleted by chance a second time
    //
    gInterpreter->DeleteGlobal(this);

    //
    // This is a possibility for the user to check whether this
    // object has already been deleted. It has been added
    // to the list in the constructor.
    //
    gROOT->GetListOfSpecials()->Remove(this);

    SetLogStream(NULL);

    //
    // Delete the list of objects corresponding to this object
    //
    delete fList;

    //
    // Delete the list list of canvases used in batch mode
    // instead of the Root Embedded Canvases in the TGTab
    //
    delete fBatch;

    //
    // Delete the font used for the logging window
    //
    if (fFont)
        gVirtualX->DeleteFont(fFont);

    //
    // Delete mutex
    //
    delete fMutex;
}

// --------------------------------------------------------------------------
//
// Takes a TGCompositeFrame as argument. Searches for the first
// TRootEmbeddedCanvas which is contained by it and returns a pointer
// to the corresponding TCanvas. If it isn't found NULL is returned.
//
TRootEmbeddedCanvas *MStatusDisplay::GetEmbeddedCanvas(TGCompositeFrame *cf) const
{
    TIter Next(cf->GetList());

    TGFrameElement *f;
    while ((f=(TGFrameElement*)Next()))
        if (f->fFrame->InheritsFrom(TRootEmbeddedCanvas::Class()))
            return (TRootEmbeddedCanvas*)f->fFrame;

    return NULL;
}

// --------------------------------------------------------------------------
//
// Takes a TGCompositeFrame as argument. Searches for the first
// TRootEmbeddedCanvas which is contained by it and returns a pointer
// to the corresponding TCanvas. If it isn't found NULL is returned.
//
TCanvas *MStatusDisplay::GetCanvas(TGCompositeFrame *cf) const
{
    TRootEmbeddedCanvas *ec = GetEmbeddedCanvas(cf);
    return ec ? ec->GetCanvas() : NULL;
}

// --------------------------------------------------------------------------
//
// Returns GetCanvas of the i-th Tab.
//
TCanvas *MStatusDisplay::GetCanvas(int i) const
{
    if (gROOT->IsBatch())
        return (TCanvas*)fBatch->At(i-1);

    if (i<0 || i>=fTab->GetNumberOfTabs())
    {
        *fLog << warn << "MStatusDisplay::GetCanvas: Out of range." << endl;
        return NULL;
    }

    return GetCanvas(fTab->GetTabContainer(i));
}

// --------------------------------------------------------------------------
//
// Returns j-th pad of the i-th Tab. 
// Sets the pad to fill an entire window.
//
// This function can be used if single pad's out of an MStatusDisplay 
// have to be stored to file. 
//
// ATTENTION: This function modifies the requested tab in MStatusDisplay itself!
//
TVirtualPad *MStatusDisplay::GetFullPad(const Int_t i, const Int_t j)
{
  
  TVirtualPad *vpad = GetCanvas(i)->GetPad(j);
  if (vpad)
    vpad->SetPad(0.,0.,1.,1.);
  else
    *fLog << warn << "MStatusDisplay::GetFullPad: Pad is out of range." << endl;

  return vpad;
}



// --------------------------------------------------------------------------
//
// Searches for a TRootEmbeddedCanvas in the TGCompositeFramme of the
// Tab with the name 'name'. Returns the corresponding TCanvas or
// NULL if something isn't found.
//
TCanvas *MStatusDisplay::GetCanvas(const TString &name) const
{
    TGFrameElement *f;
    TIter Next(fTab->GetList());
    while ((f=(TGFrameElement*)Next()))
    {
        TObject *frame = f->fFrame;
        if (!frame->InheritsFrom(TGTabElement::Class()))
            continue;

        TGTabElement *tab = (TGTabElement*)frame;
        if (tab->GetString()==name)
            break;
    }

    // Search for the next TGCompositeFrame in the list
    while ((f=(TGFrameElement*)Next()))
    {
        TObject *frame = f->fFrame;
        if (frame->InheritsFrom(TGCompositeFrame::Class()))
            return GetCanvas((TGCompositeFrame*)frame);
    }

    return NULL;
}

// --------------------------------------------------------------------------
//
// Calls TCanvas::cd(), for the canvas returned by GetCanvas.
//
Bool_t MStatusDisplay::CdCanvas(const TString &name)
{
    TCanvas *c = GetCanvas(name);
    if (!c)
        return kFALSE;

    c->cd();
    return kTRUE;
}

TGCompositeFrame *MStatusDisplay::AddRawTab(const char *name)
{
    // Add new tab
    TGCompositeFrame *f = fTab->AddTab(name);

    TGComboBox *box = (TGComboBox*)fList->FindWidget(kTabs);
    box->AddEntry(name, box->GetListBox()->GetNumberOfEntries());

    // layout and map new tab
    Layout();
    MapSubwindows();
    Layout();

    // display new tab in the main frame
    // FIXME: This is a workaround, because TApplication::Run is not
    //        thread safe against ProcessEvents. We assume, that if
    //        we are not in the Main-Thread ProcessEvents() is
    //        called by the TApplication Event Loop...
    if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
        gClient->ProcessEventsFor(fTab);

    *fLog << inf << "Adding Raw Tab '" << name << "' (" << f->GetWidth() << "x";
    *fLog << f->GetHeight() << ")" << endl;

    // return pointer to new canvas
    return f;
}

// --------------------------------------------------------------------------
//
// This function was connected to all created canvases. It is used
// to redirect GetObjectInfo into our own status bar.
//
// The 'connection' is done in AddTab
//
void MStatusDisplay::EventInfo(Int_t event, Int_t px, Int_t py, TObject *selected)
{
    //  Writes the event status in the status bar parts
    if (!selected)
        return;

    TCanvas *c = (TCanvas*)gTQSender;

    TVirtualPad* save=gPad;

    gPad = c ? c->GetSelectedPad() : NULL;

    if (gPad)
        SetStatusLine2(selected->GetObjectInfo(px,py));

    gPad=save;
}

// --------------------------------------------------------------------------
//
// Adds a new tab with the name 'name'. Adds a TRootEmbeddedCanvas to the
// tab and returns a reference to the corresponding TCanvas.
//
TCanvas &MStatusDisplay::AddTab(const char *name)
{
    if (gROOT->IsBatch())
    {
        TCanvas *c = new TCanvas(name, name);
        fBatch->Add(c);
        return *c;
    }

    // Add new tab
    TGCompositeFrame *f = fTab->AddTab(name);

    // create root embedded canvas and add it to the tab
    TRootEmbeddedCanvas *ec = new TRootEmbeddedCanvas(name, f, f->GetWidth(), f->GetHeight(), 0);
    f->AddFrame(ec, fLayCanvas);
    fList->Add(ec);

    // set background and border mode of the canvas
    TCanvas &c = *ec->GetCanvas();

    c.SetFillColor(16/*165*//*17*//*203*/);
    c.SetBorderMode(0);

    // If kNoContextMenu set set kNoContextMenu of the canvas
    if (TestBit(kNoContextMenu))
        c.SetBit(kNoContextMenu);

    // Connect all TCanvas::ProcessedEvent to this->EventInfo
    // This means, that after TCanvas has processed an event
    // EventInfo of this class is called, see TCanvas::HandleInput
    c.Connect("ProcessedEvent(Int_t,Int_t,Int_t,TObject*)",
              "MStatusDisplay", this, "EventInfo(Int_t,Int_t,Int_t,TObject*)");

    TGComboBox *box = (TGComboBox*)fList->FindWidget(kTabs);
    box->AddEntry(name, box->GetListBox()->GetNumberOfEntries());

    // layout and map new tab
    Layout();          // seems to layout the TGCompositeFrame
    MapSubwindows();   // maps the TGCompositeFrame
    Layout();          // layout the embedded canvas in the frame

    // display new tab in the main frame
    // FIXME: This is a workaround, because TApplication::Run is not
    //        thread safe against ProcessEvents. We assume, that if
    //        we are not in the Main-Thread ProcessEvents() is
    //        called by the TApplication Event Loop...
    if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
        gClient->ProcessEventsFor(fTab);

    *fLog << inf << "Adding Tab '" << name << "' (" << f->GetWidth() << "x";
    *fLog << f->GetHeight() << ", TCanvas=" << &c << ")" << endl;

    // return pointer to new canvas
    return c;
}

// --------------------------------------------------------------------------
//
// Update a canvas in a tab, takes the corresponding TGCompositeFrame
// as an argument. This is necessary, because not all functions
// changing the contents of a canvas or pad can call SetModified()
// for the corresponding tab. If this is not called correctly the
// tab won't be updated calling TCanvas::Update(). So we simply
// redraw it by our own (instead we could recursively call
// TPad::Modified() for everything contained by the TCanvas and
// call TCanvas::Update() afterwards)
//
void MStatusDisplay::UpdateTab(TGCompositeFrame *f)
{
    if (!f)
        return;

    TCanvas *c=GetCanvas(f);
    if (!c)
        return;

    //
    // If we are in a multithreaded environment (gThreadXAR) we
    // have to make sure, that thus function is called from
    // the main thread.
    //
    if (gThreadXAR)
    {
        // Tell the X-Requester how to call this method
        TString str = Form("%d", (ULong_t)f);

        TMethodCall call(IsA(), "UpdateTab", "NULL");
        void *arr[4] = { NULL, &call, this, (void*)(const char*)str };

        // If this is not the main thread return
        if (((*gThreadXAR)("METH", 4, arr, NULL)))
            return;
    }

    //
    // Secure calls to update the tabs against itself, at least
    // c->Paint() or c->Flush() may crash X (bad drawable).
    // This makes sure, that a X call is not interuppted by
    // another X-call which was started from an gui interrrupt
    // in the same thread
    //
    if (fMutex->TryLock())
        return;

#if ROOT_VERSION_CODE < ROOT_VERSION(3,10,02)
    TPad *padsav = (TPad*)gPad;
    if (!gPad)
        c->cd();
#endif

    if (!c->IsBatch())
        c->FeedbackMode(kFALSE);  // Goto double buffer mode

    //
    // Doing this ourself gives us the possibility to repaint
    // the canvas in any case (Paint() instead of PaintModified())
    //
    c->Paint();                   // Repaint all pads
    c->Flush();                   // Copy all pad pixmaps to the screen

#if ROOT_VERSION_CODE < ROOT_VERSION(3,10,02)
    if (padsav)
        padsav->cd();
    else
        gPad=NULL;
#endif

    //c->SetCursor(kCross);

    // Old version
    //c->Modified();
    //c->Update();
    //c->Paint();

    fMutex->UnLock();
}

// --------------------------------------------------------------------------
//
// Saves the given canvas (pad) or all pads (num<0) as a temporary
// postscript file and prints it using 'lpr'. If a printer name is set
// via SetPrinter 'lpr -Pname' is used.
//
Int_t MStatusDisplay::PrintToLpr(Int_t num)
{
    TString name = "mars";

    for (int i=0; i<6; i++)
        name += (char)(gRandom->Uniform(25)+65);

    name += ".ps";

    const Int_t pages = SaveAsPS(num, name);

    SetStatusLine1("Printing...");
    SetStatusLine2("");

    if (!pages)
    {
        *fLog << warn << "MStatusDisplay::PrintToLpr: Sorry, couldn't save file as temporary postscript!" << endl;
        SetStatusLine2("Failed!");
        return 0;
    }

    TString cmd="lpr ";
    if (!fPrinter.IsNull())
    {
        cmd += "-P";
        cmd += fPrinter;
        cmd += " ";
    }
    cmd += name;

    gSystem->Exec(cmd);
    gSystem->Unlink(name);

    SetStatusLine2(Form("Done (%dpage(s))", pages));

    return pages;
}

// --------------------------------------------------------------------------
//
// Remove tab no i if this tab contains a TRootEmbeddedCanvas
//
void MStatusDisplay::RemoveTab(int i)
{
    TGCompositeFrame *f = fTab->GetTabContainer(i);
    if (!f)
        return;

    TRootEmbeddedCanvas *ec = GetEmbeddedCanvas(f);
    if (!ec)
        return;

    TCanvas *c = ec->GetCanvas();
    if (!c)
        return;

    const TString name(c->GetName());

    f->RemoveFrame(ec);
    delete fList->Remove(ec);

    fTab->RemoveTab(i);
    fTab->SetTab(0);

    TGComboBox *box = (TGComboBox*)fList->FindWidget(kTabs);
    box->RemoveEntry(i);
    for (int j=i; j<box->GetListBox()->GetNumberOfEntries(); j++)
    {
        TGTextLBEntry *entry = (TGTextLBEntry *)box->GetListBox()->Select(j+1, kFALSE);
        box->AddEntry(entry->GetText()->GetString(), j);
        box->RemoveEntry(j+1);
    }
    box->GetListBox()->Select(0);

    // Looks strange...
    // const Int_t n = fTab->GetNumberOfTabs();
    // fTab->SetTab(i<=n-1 ? i : i-1);

    // layout and map new tab
    Layout();          // seems to layout the TGCompositeFrame
    MapSubwindows();   // maps the TGCompositeFrame
    Layout();          // layout the embedded canvas in the frame

    // display new tab in the main frame
    // FIXME: This is a workaround, because TApplication::Run is not
    //        thread safe against ProcessEvents. We assume, that if
    //        we are not in the Main-Thread ProcessEvents() is
    //        called by the TApplication Event Loop...
    if (!TThread::Self()/*gApplication->InheritsFrom(TRint::Class())*/)
        gClient->ProcessEventsFor(fTab);

    *fLog << inf << "Removed Tab #" << i << " '" << name << "'" << endl;
}

// --------------------------------------------------------------------------
//
// Use this to check whether the MStatusDisplay still contains the
// TCanvas c. It could be removed meanwhile by menu usage.
//
Bool_t MStatusDisplay::HasCanvas(const TCanvas *c) const
{
    if (!c)
        return kFALSE;

    if (gROOT->IsBatch())
        return (Bool_t)fBatch->FindObject(c);

    for (int i=1; i<fTab->GetNumberOfTabs(); i++)
        if (c==GetCanvas(i))
            return kTRUE;
    return kFALSE;
}

/*
    if (...)
       fMenu->AddPopup("&CaOs", fCaOs, NULL);
    else
       fMenu->RemovePopup("CaOs");
    fMenu->Resize(fMenu->GetDefaultSize());
    MapSubwindows();
    MapWindow();
 */

void MStatusDisplay::Reset()
{
    if (gROOT->IsBatch())
    {
        fBatch->Delete();
        return;
    }

    for (int i=fTab->GetNumberOfTabs()-1; i>0; i--)
        RemoveTab(i);
}

// --------------------------------------------------------------------------
//
// Process the kC_COMMAND, kCM_MENU  messages
//
Bool_t MStatusDisplay::ProcessMessageCommandMenu(Long_t id)
{
    switch (id)
    {
    case kLoopStop:
    case kFileClose:
    case kFileExit:
        if (id==kFileExit || id==kFileClose)
            CloseWindow();
        fStatus = (Status_t)id;
        return kTRUE;

    case kFileCanvas:
        new TCanvas;
        return kTRUE;

    case kFileBrowser:
        new TBrowser;
        return kTRUE;

    case kFileReset:
        Reset();
        return kTRUE;

    case kFileOpen:
        Open();
        return kTRUE;

    case kFileSaveAs:
        SaveAs();
        return kTRUE;

    case kFileSaveAsPS:
        SaveAsPS();
        return kTRUE;

    case kFileSaveAsGIF:
        SaveAsGIF();
        return kTRUE;

    case kFileSaveAsC:
        SaveAsC();
        return kTRUE;

    case kFileSaveAsRoot:
        SaveAsRoot();
        return kTRUE;

    case kFilePrint:
        PrintToLpr();
        return kTRUE;

    case kTabSaveAs:
        SaveAs(fTab->GetCurrent());
        return kTRUE;

    case kTabSaveAsPS:
        SaveAsPS(fTab->GetCurrent());
        return kTRUE;

    case kTabSaveAsGIF:
        SaveAsGIF(fTab->GetCurrent());
        return kTRUE;

    case kTabSaveAsC:
        SaveAsC(fTab->GetCurrent());
        return kTRUE;

    case kTabSaveAsRoot:
        SaveAsRoot(fTab->GetCurrent());
        return kTRUE;

    case kTabPrint:
        PrintToLpr(fTab->GetCurrent());
        return kTRUE;

    case kTabNext:
        fTab->SetTab(fTab->GetCurrent()+1);
        return kTRUE;

    case kTabPrevious:
        fTab->SetTab(fTab->GetCurrent()-1);
        return kTRUE;

    case kTabRemove:
        RemoveTab(fTab->GetCurrent());
        return kTRUE;

    case kSize640:
        Resize(570, 480);
        return kTRUE;
    case kSize800:
        Resize(740, 600);
        return kTRUE;
    case kSize960:
        Resize(880, 700);
        return kTRUE;
    case kSize1024:
        Resize(980, 768);
        return kTRUE;
    case kSize1280:
        Resize(1280, 980);
        return kTRUE;

    case kLogClear:
        fLogBox->Clear();
        return kTRUE;
    case kLogCopy:
        fLogBox->Copy();
        return kTRUE;
    case kLogSelect:
        fLogBox->SelectAll();
        return kTRUE;
    case kLogFind:
        new MSearch(this);
        return kTRUE;
    case kLogSave:
        SetStatusLine1("Saving log...");
        SetStatusLine2("");
        *fLog << inf << "Saving log... " << flush;
        if (fLogBox->GetText()->Save("statusdisplay.log"))
        {
            *fLog << "done." << endl;
            SetStatusLine2("done.");
        }
        else
        {
            *fLog << "failed!" << endl;
            SetStatusLine2("Failed!");
        }
        return kTRUE;

    case kLogAppend:
        SetStatusLine1("Appending logg...");
        SetStatusLine2("");
        *fLog << inf << "Appending log... " << flush;
        if (fLogBox->GetText()->Append("statusdisplay.log"))
        {
            *fLog << "done." << endl;
            SetStatusLine2("done.");
        }
        else
        {
            *fLog << "failed!" << endl;
            SetStatusLine2("Failed!");
        }
        return kTRUE;
#ifdef DEBUG
    default:
        cout << "Command-Menu #" << id << endl;
#endif
    }
    return kTRUE;

}

// --------------------------------------------------------------------------
//
// Process the kC_COMMAND messages
//
Bool_t MStatusDisplay::ProcessMessageCommand(Long_t submsg, Long_t mp1, Long_t mp2)
{
    switch (submsg)
    {
    case kCM_MENU: // 1
        return ProcessMessageCommandMenu(mp1); // mp2=userdata
    case kCM_TAB:  // 8
        /*
         for (int i=0; i<fTab->GetNumberOfTabs(); i++)
         fTab->GetTabContainer(i)->UnmapWindow();
         */
        UpdateTab(fTab->GetTabContainer(mp1));
        //fTab->GetTabContainer(mp1)->MapWindow();

        /*
        if (mp1>0)
            fMenu->AddPopup("&CaOs", fCaOs, NULL);
        else
            fMenu->RemovePopup("CaOs");
        fMenu->Resize(fMenu->GetDefaultSize());
        MapSubwindows();
        MapWindow();
        */
        return kTRUE;
    case kCM_COMBOBOX: // 7
        if (mp1==kTabs)
            fTab->SetTab(mp2);
        return kTRUE;
#ifdef DEBUG
    case kCM_MENUSELECT: // 2
        cout << "Command-Menuselect #" << mp1 << " (UserData=" << (void*)mp2 << ")" << endl;
        return kTRUE;

    case kCM_BUTTON: // 3
        cout << "Command-Button." << endl;
        return kTRUE;

    case kCM_CHECKBUTTON: // 4
        cout << "Command-CheckButton." << endl;
        return kTRUE;

    case kCM_RADIOBUTTON: // 5
        cout << "Command-RadioButton." << endl;
        return kTRUE;

    case kCM_LISTBOX: // 6
        cout << "Command-Listbox #" << mp1 << " (LineId #" << mp2 << ")" << endl;
        return kTRUE;
    default:
        cout << "Command: " << "Submsg:" << submsg << " Mp1=" << mp1 << " Mp2=" << mp2 << endl;
#endif
    }
    return kTRUE;
}

// --------------------------------------------------------------------------
//
// Process the kC_TEXTVIEW messages
//
Bool_t MStatusDisplay::ProcessMessageTextview(Long_t submsg, Long_t mp1, Long_t mp2)
{
    // kC_TEXTVIEW, kTXT_ISMARKED, widget id, [true|false]                  //
    // kC_TEXTVIEW, kTXT_DATACHANGE, widget id, 0                           //
    // kC_TEXTVIEW, kTXT_CLICK2, widget id, position (y << 16) | x)         //
    // kC_TEXTVIEW, kTXT_CLICK3, widget id, position (y << 16) | x)         //
    // kC_TEXTVIEW, kTXT_F3, widget id, true                                //
    // kC_TEXTVIEW, kTXT_OPEN, widget id, 0                                 //
    // kC_TEXTVIEW, kTXT_CLOSE, widget id, 0                                //
    // kC_TEXTVIEW, kTXT_SAVE, widget id, 0                                 //
#ifdef DEBUG
    switch (submsg)
    {
    case kTXT_ISMARKED:
        cout << "Textview-IsMarked #" << mp1 << " " << (mp2?"yes":"no") << endl;
        return kTRUE;

    case kTXT_DATACHANGE:
        cout << "Textview-DataChange #" << mp1 << endl;
        return kTRUE;

    case kTXT_CLICK2:
        cout << "Textview-Click2 #" << mp1 << " x=" << (mp2&0xffff) << " y= " << (mp2>>16) << endl;
        return kTRUE;

    case kTXT_CLICK3:
        cout << "Textview-Click3 #" << mp1 << " x=" << (mp2&0xffff) << " y= " << (mp2>>16) << endl;
        return kTRUE;

    case kTXT_F3:
        cout << "Textview-F3 #" << mp1 << endl;
        return kTRUE;

    case kTXT_OPEN:
        cout << "Textview-Open #" << mp1 << endl;
        return kTRUE;

    case kTXT_CLOSE:
        cout << "Textview-Close #" << mp1 << endl;
        return kTRUE;

    case kTXT_SAVE:
        cout << "Textview-Save #" << mp1 << endl;
        return kTRUE;

    default:
        cout << "Textview: " << "Submsg:" << submsg << " Mp1=" << mp1 << " Mp2=" << mp2 << endl;
    }
#endif
    return kTRUE;
}

// --------------------------------------------------------------------------
//
// Process the kC_USER messages
//
Bool_t MStatusDisplay::ProcessMessageUser(Long_t submsg, Long_t mp1, Long_t mp2)
{
    // kS_START, case sensitive | backward<<1, char *txt
    switch (submsg)
    {
    case kS_START:
        fLogBox->Search((char*)mp2, !(mp1&2>>1), mp1&1);
        return kTRUE;
#ifdef DEBUG
    default:
        cout << "User: " << "Submsg:" << submsg << " Mp1=" << mp1 << " Mp2=" << mp2 << endl;
#endif
    }
    return kTRUE;
}

// --------------------------------------------------------------------------
//
// Process the messages from the GUI
//
Bool_t MStatusDisplay::ProcessMessage(Long_t msg, Long_t mp1, Long_t mp2)
{
    // Can be found in WidgetMessageTypes.h
#ifdef DEBUG
    cout << "Msg: " << GET_MSG(msg) << " Submsg:" << GET_SUBMSG(msg);
    cout << " Mp1=" << mp1 << " Mp2=" << mp2 << endl;
#endif
    switch (GET_MSG(msg))
    {
    case kC_COMMAND:  // 1
        return ProcessMessageCommand(GET_SUBMSG(msg), mp1, mp2);

    case kC_TEXTVIEW: // 9
        return ProcessMessageTextview(GET_SUBMSG(msg), mp1, mp2);

    case kC_USER:     // 1001
        return ProcessMessageUser(GET_SUBMSG(msg), mp1, mp2);
    }
#ifdef DEBUG
    cout << "Msg: " << GET_MSG(msg) << " Submsg:" << GET_SUBMSG(msg);
    cout << " Mp1=" << mp1 << " Mp2=" << mp2 << endl;
#endif
    return kTRUE;
}

void MStatusDisplay::CloseWindow()
{
    // Got close message for this MainFrame. Calls parent CloseWindow()
    // (which destroys the window) and terminate the application.
    // The close message is generated by the window manager when its close
    // window menu item is selected.

    // CloseWindow must be overwritten because otherwise CloseWindow
    // and the destructor are calling DestroyWindow which seems to be
    // in conflict with the TRootEmbeddedCanvas.

    // FIXME: Make sure that the Status Display is deleted from every
    //        where (eg Eventloop) first!

    //gLog << dbg << fName << " is on heap: " << (int)IsOnHeap() << endl;

    if (TestBit(kExitLoopOnExit) || TestBit(kExitLoopOnClose))
    {
        //gLog << dbg << "CloseWindow() calling ExitLoop." << endl;
        gSystem->ExitLoop();
    }

    if (fIsLocked<=0 && IsOnHeap())
    {
        //gLog << dbg << "delete " << fName << ";" << endl;
        delete this;
        // DO NOT EXECUTE ANY COMMAND AFTER this!
    }
    else
    {
        fStatus = kFileExit;
        //gLog << dbg << fName << ".fStatus=kFileExit;" << endl;
    }
}

// --------------------------------------------------------------------------
//
// Calls SetBit(kNoContextMenu) for all TCanvas objects found in the
// Tabs.
//
void MStatusDisplay::SetNoContextMenu(Bool_t flag)
{
    if (fIsLocked>1 || gROOT->IsBatch())
        return;

    flag ? SetBit(kNoContextMenu) : ResetBit(kNoContextMenu);

    for (int i=1; i<fTab->GetNumberOfTabs(); i++)
    {
        TCanvas *c = GetCanvas(i);
        if (c)
            flag ? c->SetBit(kNoContextMenu) : c->ResetBit(kNoContextMenu);
    }
}

// --------------------------------------------------------------------------
//
// Updates the canvas (if existing) in the currenly displayed Tab.
// The update intervall is controlled by StartUpdate and StopUpdate
//
Bool_t MStatusDisplay::HandleTimer(TTimer *timer)
{
    if (gROOT->IsBatch())
        return kTRUE;

    const Int_t c = fTab->GetCurrent();

    // Skip Legend Tab
    if (c==0)
        return kTRUE;

    // Update a canvas tab (if visible)
    if (timer==&fTimer && c!=fLogIdx)
    {
        UpdateTab(fTab->GetCurrentContainer());
        return kTRUE;
    }

    // update the logbook tab (if visible)
    if (timer==&fLogTimer && c==fLogIdx)
    {
        fLog->UpdateGui();

        /*
        if (!fLogBox->TestBit(kHasChanged))
            return kTRUE;

            fLogBox->ResetBit(kHasChanged);
            */
        return kTRUE;
    }

    return kTRUE;
}

// --------------------------------------------------------------------------
//
// Draws a clone of a canvas into a new canvas. Taken from TCanvas.
//
void MStatusDisplay::DrawClonePad(TCanvas &newc, TCanvas &oldc) const
{
    //copy pad attributes
    newc.Range(oldc.GetX1(),oldc.GetY1(),oldc.GetX2(),oldc.GetY2());
    newc.SetTickx(oldc.GetTickx());
    newc.SetTicky(oldc.GetTicky());
    newc.SetGridx(oldc.GetGridx());
    newc.SetGridy(oldc.GetGridy());
    newc.SetLogx(oldc.GetLogx());
    newc.SetLogy(oldc.GetLogy());
    newc.SetLogz(oldc.GetLogz());
    newc.SetBorderSize(oldc.GetBorderSize());
    newc.SetBorderMode(oldc.GetBorderMode());
    ((TAttLine&)oldc).Copy((TAttLine&)newc);
    ((TAttFill&)oldc).Copy((TAttFill&)newc);
    ((TAttPad&)oldc).Copy((TAttPad&)newc);

    // This must be there: Otherwise GetDrawOption() won't work
    TVirtualPad *padsav = gPad;
    oldc.cd();

    //copy primitives
    TObject *obj;
    TIter next(oldc.GetListOfPrimitives());
    while ((obj=next()))
    {
        // Old line - I think it is not necessary anymore because of the cd()
        //gROOT->SetSelectedPad(&newc);

        // Now make a clone of the object
        TObject *clone = obj->Clone();

        // Clone also important bits (FIXME: Is this correct)
        clone->SetBit(obj->TestBits(kMustCleanup|kCannotPick|kNoContextMenu));

        // Now make sure that the clones are deleted at a later time
        clone->SetBit(kCanDelete);

        // Add the clone and its draw-option to the current pad
        newc.GetListOfPrimitives()->Add(clone, obj->GetDrawOption());
    }
    newc.Modified();
    newc.Update();

    padsav->cd();
}

Bool_t MStatusDisplay::Display(const TObjArray &list)
{
    TIter Next(&list);

    TObject *o=Next();
    if (!o)
    {
        *fLog << err << "MStatusDisplay::Display: No entry in TObjArray." << endl;
        return kFALSE;
    }

    fTitle = o->GetTitle();

    TCanvas *c;
    while ((c=(TCanvas*)Next()))
        if (!GetCanvas(c->GetName()))
            DrawClonePad(AddTab(c->GetName()), *c);

    return kTRUE;
}

// --------------------------------------------------------------------------
//
// Reads the contents of a saved MStatusDisplay from a file.
//
Int_t MStatusDisplay::Read(const char *name)
{
    if (!gFile)
    {
        *fLog << warn << "MStatusDisplay::Read: No file found. Please create a TFile first." << endl;
        return 0;
    }

    if (!gFile->IsOpen())
    {
        *fLog << warn << "MStatusDisplay::Read: File not open. Please open the TFile first." << endl;
        return 0;
    }

    MStatusArray list;

    const Int_t n = list.Read(name);
    if (n==0)
    {
        *fLog << warn << "MStatusDisplay::Read: No objects read." << endl;
        return 0;
    }

    if (!Display(list))
    {
        *fLog << err << "MStatusDisplay::Display: No entry in " << name << "." << endl;
        return 0;
    }

    *fLog << inf << "MStatusDisplay: Key " << name << " with " << n << " keys read from file." << endl;

    return n;
}

// --------------------------------------------------------------------------
//
// Writes the contents of a MStatusDisplay to a file.
//
Int_t MStatusDisplay::Write(Int_t num, const char *name, Int_t option, Int_t bufsize)
{
    if (!gFile)
    {
        *fLog << warn << "MStatusDisplay::Write: No file found. Please create a TFile first." << endl;
        return 0;
    }

    if (!gFile->IsOpen())
    {
        *fLog << warn << "MStatusDisplay::Write: File not open. Please open the TFile first." << endl;
        return 0;
    }

    if (!gFile->IsWritable())
    {
        *fLog << warn << "MStatusDisplay::Write: File not writable." << endl;
        return 0;
    }

    if (num==0)
    {
        *fLog << warn << "MStatusDisplay::Write: Tab doesn't contain an embedded Canvas... skipped." << endl;
        return 0;
    }

    if (!gROOT->IsBatch() && num>=fTab->GetNumberOfTabs())
    {
        *fLog << warn << "MStatusDisplay::Write: Tab doesn't exist... skipped." << endl;
        return 0;
    }
    if (gROOT->IsBatch() && num>fBatch->GetSize())
    {
        *fLog << warn << "MStatusDisplay::Write: Tab doesn't exist... skipped." << endl;
        return 0;
    }

    MStatusArray list;

    TNamed named;
    named.SetTitle(fTitle);
    list.Add(&named);

    const Int_t max  = gROOT->IsBatch() ? fBatch->GetSize()+1 : fTab->GetNumberOfTabs();
    const Int_t from = num<0 ?   1 : num;
    const Int_t to   = num<0 ? max : num+1;

    TCanvas *c;
    for (int i=from; i<to; i++)
        if ((c = GetCanvas(i)))
            list.Add(c);

    const Int_t n = list.Write(name, kSingleKey);

    //*fLog << inf << "MStatusDisplay: " << n << " keys written to file as key " << name << "." << endl;

    return n;
}

// --------------------------------------------------------------------------
//
// Use this to start the synchronous (GUI eventloop driven) tab update.
// Can also be used to change the update intervall. If millisec<0
// the intervall given in SetUpdateTime is used. If the intervall in
// SetUpdateTime is <0 nothing is done. (Call SetUpdateTime(-1) to
// disable the automatic update in a MEventloop.
//
void MStatusDisplay::StartUpdate(Int_t millisec)
{
    if (fIsLocked>1)
        return;

    if (fTimer.GetTime()<TTime(0))
        return;
    fTimer.Start(millisec);
}

// --------------------------------------------------------------------------
//
// Stops the automatic GUI update
//
void MStatusDisplay::StopUpdate()
{
    if (fIsLocked>1)
        return;

    fTimer.Stop();
}

// --------------------------------------------------------------------------
//
// Set the update interval for the GUI update, see StartUpdate.
//
void MStatusDisplay::SetUpdateTime(Long_t t)
{
    fTimer.SetTime(t);
}

// --------------------------------------------------------------------------
//
// Set the background color in a canvas
//
void MStatusDisplay::CanvasSetFillColor(TPad &p, Int_t col) const
{
    TObject *obj;

    // See also TPad::UseCurrentStyle
    TIter Next(p.GetListOfPrimitives());
    while ((obj=Next()))
    {
        if (obj->InheritsFrom(TPad::Class()))
            CanvasSetFillColor(*(TPad*)obj, col);
        if (obj->InheritsFrom(TFrame::Class()))
            ((TFrame*)obj)->SetFillColor(col);
    }

    p.SetFillColor(col);
}

void MStatusDisplay::AddExtension(TString &name, const TString &ext, Int_t num) const
{
    if (name.IsNull())
    {
        name = "status";
        if (num>0)
        {
            name += "-";
            name += num;
        }
    }

    if (name.EndsWith("."+ext))
        return;

    name += ".";
    name += ext;
}

Bool_t MStatusDisplay::CheckTabForCanvas(int num) const
{
    if (gROOT->IsBatch())
        return num>0 && num<=fBatch->GetSize() || num<0;

    if (num>=fTab->GetNumberOfTabs())
    {
        *fLog << warn << "Tab #" << num << " doesn't exist..." << endl;
        return kFALSE;
    }
    if (num==0)
    {
        *fLog << warn << "Tab #" << num << " doesn't contain an embedded canvas..." << endl;
        return kFALSE;
    }
    if (fTab->GetNumberOfTabs()<2 || !gPad)
    {
        *fLog << warn << "Sorry, you must have at least one existing canvas (gPad!=NULL)" << endl;
        return kFALSE;
    }
    return kTRUE;
}

// --------------------------------------------------------------------------
//
// Insert the following two lines into the postscript header:
//
//   %%DocumentPaperSizes: a4
//   %%Orientation: Landscape
//
void MStatusDisplay::UpdatePSHeader(const TString &name) const
{
    const TString newstr("%%DocumentPaperSizes: a4\n%%Orientation: Landscape\n");

    ifstream fin(name);
    ofstream fout(name+".$$$");

    char c;

    TString str;
    fin >> str >> c;                // Read "%!PS-Adobe-2.0\n"
    fout << str << endl << newstr;

    // Doing it in blocks seems not to gain much for small (MB) files
    while (fin)
    {
        fin.read(&c, 1);
        fout.write(&c, 1);
    }

    gSystem->Unlink(name);
    gSystem->Rename(name+".$$$", name);
/*
    //
    // Old style algorithm. Shifts blocks inside a single file --- SLOW!
    //
    const Int_t l = newstr.Length();

    Long_t t[4]; // { id, size, flags, modtime }
    gSystem->GetPathInfo(name, t, t+1, t+2, t+3);

    char *c[2] = { new char[l], new char[l] };

    fstream f(name, ios::in|ios::out);

    TString str;
    f >> str >> c[0][0];     // Read "%!PS-Adobe-2.0\n" (Mini Header)
    f.read(c[0], l);
    f.seekp(-l, ios::cur);
    f.write(newstr, l);

    int i=0;
    while (1)
    {
        f.read(c[(i+1)%2], l);
        f.seekp(-l, ios::cur);

        if (f)
        {
            f.write(c[i%2],l);
            i++;
            i%=2;
            continue;
        }

        const Int_t ssz   = str.Length()+1;        // Length of Mini-Header
        const Int_t block = t[1]-ssz;              // Length of block to be shifted
        const Int_t size  = block%l;               // Reminder
        const Int_t pos   = (block/l)*l + ssz + 1; // Position to start writing

        f.clear();
        f.seekp(pos);
        f.write(c[i%2], l);
        f.write(c[(i+1)%2], size);
        break;
    }

    delete c[1];
    delete c[0];
*/
}

// --------------------------------------------------------------------------
//
// In case of num<0 all tabs are written into the PS file. If num>0
// the canvas in the corresponding tab is written to the file.
// Name is the name of the file (with or without extension).
//
// Returns the number of pages written.
//
// To write all tabs you can also use SaveAsPS(name)
//
// If the third argument is given a bottom line is drawn with the text
// under it. If no argument is given a bottom line is drawn if
// fTitle (SetTitle) is not empty.
//
Int_t MStatusDisplay::SaveAsPS(Int_t num, TString name, const TString addon)
{
    SetStatusLine1("Writing Postscript file...");
    SetStatusLine2("");

    if (!CheckTabForCanvas(num))
    {
        SetStatusLine2("Failed!");
        return 0;
    }

    AddExtension(name, "ps", num);

    if (num<0)
        *fLog << inf << "Open ps-File: " << name << endl;

    TPad       *padsav = (TPad*)gPad;
    TVirtualPS *psave  = gVirtualPS;

    TDatime d;

    TPostScript ps(name, 112);
    ps.SetBit(TPad::kPrintingPS);
    ps.PrintFast(13, "/nan {1} def ");

    gVirtualPS = &ps;

    //
    // Create a list to delete the canvas clones
    //
    TList l;
    l.SetOwner();

    //
    // Create some GUI elements for a page legend
    //
    TLine line;

    int page = 1;

    //
    // Maintain tab numbers
    //
    const Int_t max  = gROOT->IsBatch() ? fBatch->GetSize()+1 : fTab->GetNumberOfTabs();
    const Int_t from = num<0 ?   1 : num;
    const Int_t to   = num<0 ? max : num+1;

    for (int i=from; i<to; i++)
    {
        TCanvas *c;
        if (!(c = GetCanvas(i)))
        {
            if (num<0)
                *fLog << inf << " - ";
            *fLog << "Tab #" << i << " doesn't contain an embedded Canvas... skipped." << endl;
            continue;
        }

        SetStatusLine2(Form("Tab #%d", i));

        //
        // Init page and page size, make sure, that the canvas in the file
        // has the same Aspect Ratio than on the screen.
        //
        ps.NewPage();

        //
        // 28 is used here to scale the canvas into a height of 28,
        // such that the page title can be set above the canvas...
        //
        Float_t psw = 28.0; // A4 - width (29.7)
        Float_t psh = 21.0; // A4 - height (21.0)

        const Float_t cw = c->GetWw();
        const Float_t ch = c->GetWh();

        if (psw/psh>cw/ch)
            psw = cw/ch*psh;
        else
            psh = ch/cw*psw;

        ps.Range(psw, psh); // A4

        //
        // Clone canvas and change background color and schedule for
        // deletion
        //
        TCanvas *n = (TCanvas*)c->Clone();
        CanvasSetFillColor(*n, kWhite);
        l.Add(n);

        //
        // Paint canvas into root file
        //
        if (num<0)
            *fLog << inf << " - ";
        *fLog << inf << "Writing Tab #" << i << ": " << c->GetName() << " (" << c << ") ";
        if (num>0)
            *fLog << "to " << name;
        *fLog << "... " << flush;

        n->SetBatch(kTRUE);
        n->Paint();

        //
        // Use the canvas as coordinate system for the overlaying text
        //
        gPad = n;
        //n->cd();

        //
        // Print overlaying text (NDC = %)
        //
        ps.SetTextColor(kBlack);
        ps.SetTextSize(0.015);
        ps.SetTextFont(22);
        ps.SetTextAlign(11); // left top
        ps.TextNDC(0, 1.015, TString("  ")+n->GetName());
        ps.SetTextAlign(21); // cent top
        ps.TextNDC(0.5, 1.015, TString("MARS - Magic Analysis and Reconstruction Software - ")+d.AsString());
        ps.SetTextAlign(31); // right top
        ps.TextNDC(1, 1.015, Form("Page No.%i (%i)  ", page++, i));
        line.PaintLineNDC(0, 1.01, 1, 1.01);

        TString txt(addon.IsNull() ? fTitle : addon);
        if (!txt.IsNull())
        {
            line.PaintLineNDC(0, -0.00, 1, -0.00);
            ps.SetTextAlign(11); // left top
            ps.TextNDC(0, -0.015, TString("  ")+txt);
            ps.SetTextAlign(31); // right top
            ps.TextNDC(1, -0.015, "(c) 2000-2004, Thomas Bretz  ");
        }

        //
        // Finish drawing page
        //
        n->SetBatch(kFALSE);
        *fLog << "done." << endl;
    }

    gPad = NULL; // Important!
    l.Delete();

    ps.Close();

    SetStatusLine2("Updating header of PS file...");

    if (num<0)
        *fLog << " - Updating header of PS file... " << flush;
    UpdatePSHeader(name);
    if (num<0)
        *fLog << inf << "done." << endl;

    gVirtualPS = psave;
    if (padsav)
        padsav->cd();

    if (num<0)
        *fLog << inf << "done." << endl;

    SetStatusLine2(Form("Done (%dpages)", page-1));

    return page-1;
}

Bool_t MStatusDisplay::SaveAsGIF(Int_t num, TString name)
{
    if (gROOT->IsBatch())
    {
        *fLog << warn << "Sorry, writing gif-files is not available in batch mode." << endl;
        return 0;
    }
    SetStatusLine1("Writing GIF file...");
    SetStatusLine2("");

    if (!CheckTabForCanvas(num))
    {
        SetStatusLine2("Failed!");
        return 0;
    }

    AddExtension(name, "gif", num);

    if (num<0)
        *fLog << inf << "Writing gif-Files..." << endl;

    TPad *padsav = (TPad*)gPad;

    int page = 1;

    //
    // Maintain tab numbers
    //
    const Int_t from = num<0 ? 1 : num;
    const Int_t to   = num<0 ? fTab->GetNumberOfTabs() : num+1;

    for (int i=from; i<to; i++)
    {
        TCanvas *c;
        if (!(c = GetCanvas(i)))
        {
            if (num<0)
                *fLog << inf << " - ";
            *fLog << "Tab #" << i << " doesn't contain an embedded Canvas... skipped." << endl;
            continue;
        }

        SetStatusLine2(Form("Tab #%d", i));

        //
        // Clone canvas and change background color and schedule for
        // deletion
        //
        //TCanvas *n = (TCanvas*)c->Clone();
        //CanvasSetFillColor(*n, kWhite);

        //
        // Paint canvas into root file
        //
        TString writename = name;
        if (num<0)
        {
            TString numname = "-";
            numname += i;
            writename.Insert(name.Last('.'), numname);
        }
        if (num<0)
            *fLog << inf << " - ";
        *fLog << inf << "Writing Tab #" << i << " to " << writename << ": " << c->GetName() << " (" << c << ") ";
        if (num>0)
            *fLog << "to " << name;
        *fLog << "..." << flush;

        c->Draw();
        c->SaveAs(writename);
        /*
         n->Draw();
         n->SaveAs(writename);
         delete n;
         */

        if (num<0)
            *fLog << "done." << endl;
    }

    padsav->cd();

    *fLog << inf << "done." << endl;

    SetStatusLine2("Done.");

    return page-1;
}

Bool_t MStatusDisplay::SaveAsC(Int_t num, TString name)
{
    SetStatusLine1("Writing C++ file...");
    SetStatusLine2("");

    if (!CheckTabForCanvas(num))
    {
        SetStatusLine2("Failed!");
        return 0;
    }

    AddExtension(name, "C", num);

    if (num<0)
        *fLog << inf << "Writing C-Files..." << endl;

    TPad *padsav = (TPad*)gPad;

    int page = 1;

    //
    // Maintain tab numbers
    //
    const Int_t from = num<0 ? 1 : num;
    const Int_t to   = num<0 ? fTab->GetNumberOfTabs() : num+1;

    for (int i=from; i<to; i++)
    {
        TCanvas *c;
        if (!(c = GetCanvas(i)))
        {
            if (num<0)
                *fLog << inf << " - ";
            *fLog << "Tab #" << i << " doesn't contain an embedded Canvas... skipped." << endl;
            continue;
        }

        SetStatusLine2(Form("Tab #%d", i));

        //
        // Clone canvas and change background color and schedule for
        // deletion
        //
        TCanvas *n = (TCanvas*)c->Clone();
        CanvasSetFillColor(*n, kWhite);

        //
        // Paint canvas into root file
        //
        TString writename = name;
        if (num<0)
        {
            TString numname = "-";
            numname += i;
            writename.Insert(name.Last('.'), numname);
        }
        if (num<0)
            *fLog << inf << " - ";
        *fLog << inf << "Writing Tab #" << i << " to " << writename << ": " << c->GetName() << " (" << n << ") ";
        if (num>0)
            *fLog << "to " << name;
        *fLog << "..." << flush;

        n->SaveSource(writename, "");
        delete n;

        if (num<0)
            *fLog << "done." << endl;
    }

    padsav->cd();

    *fLog << inf << "done." << endl;

    SetStatusLine2("Done.");

    return page-1;
}

// --------------------------------------------------------------------------
//
// In case of num<0 all tabs are written into the PS file. If num>0
// the canvas in the corresponding tab is written to the file.
// Name is the name of the file (with or without extension).
//
// Returns the number of keys written.
//
// To write all tabs you can also use SaveAsPS(name)
//
Int_t MStatusDisplay::SaveAsRoot(Int_t num, TString name)
{
    SetStatusLine1("Writing root file...");
    SetStatusLine2("");

    if (!CheckTabForCanvas(num))
    {
        SetStatusLine2("Failed!");
        return 0;
    }

    AddExtension(name, "root", num);

    TFile *fsave = gFile;
    TFile file(name, "RECREATE", "MARS - Status Window Contents", 9);
    const Int_t keys = Write(num);
    gFile = fsave;

    SetStatusLine2("Done.");

    return keys;
}

// --------------------------------------------------------------------------
//
//  Opens a save as dialog
//
Int_t MStatusDisplay::SaveAs(Int_t num)
{
    static const char *gSaveAsTypes[] =
    {
        "PostScript",   "*.ps",
        "Gif files",    "*.gif",
        "Macro files",  "*.C",
        "ROOT files",   "*.root",
        "All files",    "*",
        NULL,           NULL
    };

    static TString dir(".");

    TGFileInfo fi; // fFileName and fIniDir deleted in ~TGFileInfo

    fi.fFileTypes = (const char**)gSaveAsTypes;
    fi.fIniDir    = StrDup(dir);

    new TGFileDialog(fClient->GetRoot(), this, kFDSave, &fi);

    if (!fi.fFilename)
        return 0;

    dir = fi.fIniDir;

    const TString name(fi.fFilename);

    if (name.EndsWith(".root")) return SaveAsRoot(num, name);
    if (name.EndsWith(".ps"))   return SaveAsPS(num, name);
    if (name.EndsWith(".gif"))  return SaveAsGIF(num, name);
    if (name.EndsWith(".C"))    return SaveAsC(num, name);

    Warning("MStatusDisplay::SaveAs", "Unknown Extension: %s", fi.fFilename);
    return 0;
}

// --------------------------------------------------------------------------
//
//  Open contents of a MStatusDisplay with key name from file fname.
//
Int_t MStatusDisplay::Open(TString fname, const char *name)
{
    TFile file(fname, "READ");
    if (file.IsZombie())
    {
        gLog << warn << "WARNING - Cannot open file " << fname << endl;
        return 0;
    }

    return Read(name);
}

// --------------------------------------------------------------------------
//
//  Opens an open dialog
//
Int_t MStatusDisplay::Open()
{
    static const char *gOpenTypes[] =
    {
        "ROOT files", "*.root",
        "All files",  "*",
        NULL,           NULL
    };

    static TString dir(".");

    TGFileInfo fi; // fFileName and fIniDir deleted in ~TGFileInfo

    fi.fFileTypes = (const char**)gOpenTypes;
    fi.fIniDir    = StrDup(dir);

    new TGFileDialog(fClient->GetRoot(), this, kFDSave, &fi);

    if (!fi.fFilename)
        return 0;

    dir = fi.fIniDir;

    return Open(fi.fFilename);
}

Bool_t MStatusDisplay::HandleConfigureNotify(Event_t *evt)
{
    //
    // The initialization of the GUI is not yet enough finished...
    //
    if (!fTab)
        return kTRUE;

    UInt_t w = evt->fWidth;
    UInt_t h = evt->fHeight;

    /*
     cout << "Old: " << GetWidth() << " " << GetHeight() << " " << GetBorderWidth() << endl;
     cout << "New: " << w << " " << h << " ";
     cout << "New: " << GetDefaultWidth() << " " << GetDefaultHeight() << " " << endl;
     */

    Bool_t wchanged = w!=GetWidth();
    Bool_t hchanged = h!=GetHeight();

    if (!wchanged && !hchanged)
    {
        Layout();
        // FIXME: Make sure that this doesn't result in endless loops.
        return kTRUE;
    }


    if (GetWidth()==1 && GetHeight()==1)
        return kTRUE;

    // calculate the constant part of the window
    const UInt_t cw = GetWidth() -fTab->GetWidth();
    const UInt_t ch = GetHeight()-fTab->GetHeight();

    // calculate new size of frame (canvas @ 1:sqrt(2))
    if (hchanged)
        w = (UInt_t)((h-ch)*sqrt(2.)+.5)+cw;
    else
        h = (UInt_t)((w-cw)/sqrt(2.)+.5)+ch;

    // resize frame
    Resize(w, h);

    return kTRUE;
}

Bool_t MStatusDisplay::HandleEvent(Event_t *event)
{
    Bool_t rc = TGMainFrame::HandleEvent(event);

    //
    // This fixes a bug in older root versions which makes
    // TCanvas crash if gPad==NULL. So we make sure, that
    // gPad!=NULL -- be carfull, this may have other side
    // effects.
    //
#if ROOT_VERSION_CODE < ROOT_VERSION(3,10,01)
    if (!gPad && fTab)
        for (int i=0; i<fTab->GetNumberOfTabs(); i++)
        {
            TCanvas *c = GetCanvas(i);
            if (c)
            {
                c->cd();
                gLog << dbg << "MStatusDisplay::HandleEvent - Workaround: gPad=" << gPad << "." << endl;
                break;
            }
        }
#endif

    return rc;
}