TGTab.cxx

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// @(#)root/gui:$Id$
// Author: Fons Rademakers   13/01/98
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
/**************************************************************************
 
    This source is based on Xclass95, a Win95-looking GUI toolkit.
    Copyright (C) 1996, 1997 David Barth, Ricky Ralston, Hector Peraza.
 
    Xclass95 is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
**************************************************************************/
 
 
/** \class TGTab
    \ingroup guiwidgets
 
A tab widget contains a set of composite frames each with a little
tab with a name (like a set of folders with tabs).
 
Clicking on a tab will bring the associated composite frame to the
front and generate the following event:
kC_COMMAND, kCM_TAB, tab id, 0.
 
\class TGTabElement
\ingroup guiwidgets
Service classes of the tab widget.
 
\class TGTabLayout
\ingroup guiwidgets
Service classes of the tab widget.
 
*/
 
 
#include "TGTab.h"
#include "TGResourcePool.h"
#include "TList.h"
#include "TClass.h"
#include "TGPicture.h"
#include "TVirtualX.h"
 
#include <iostream>
 
const TGFont *TGTab::fgDefaultFont = nullptr;
const TGGC   *TGTab::fgDefaultGC = nullptr;
 
ClassImp(TGTabElement);
ClassImp(TGTabLayout);
ClassImp(TGTab);
 
 
////////////////////////////////////////////////////////////////////////////////
/// Create a tab element. Text is adopted by tab element.
 
TGTabElement::TGTabElement(const TGWindow *p, TGString *text, UInt_t w, UInt_t h,
                           GContext_t norm, FontStruct_t font,
                           UInt_t options, Pixel_t back) :
   TGFrame(p, w, h, options, back)
{
   fClosePic     = 0;
   fClosePicD    = 0;
   fShowClose    = kFALSE;
   fActive       = kFALSE;
   fText         = text;
   fBorderWidth  = 0;
   fTWidth       = 0;
   fNormGC       = norm;
   fFontStruct   = font;
   fEditDisabled = kEditDisableGrab | kEditDisableBtnEnable;
 
   fClosePic      = fClient->GetPicture("closetab.png");
   fClosePicD     = fClient->GetPicture("closetab_d.png");
   int max_ascent, max_descent;
   if (fText)
      fTWidth = gVirtualX->TextWidth(fFontStruct, fText->GetString(), fText->GetLength());
   gVirtualX->GetFontProperties(fFontStruct, max_ascent, max_descent);
   fTHeight = max_ascent + max_descent;
   Resize(std::max(fTWidth+12, (UInt_t)45), fTHeight+6);
   fEnabled = kTRUE;
   gVirtualX->GrabButton(fId, kAnyButton, kAnyModifier, kButtonPressMask |
                         kPointerMotionMask, kNone, kNone);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete tab element.
 
TGTabElement::~TGTabElement()
{
   if (fClosePic) gClient->FreePicture(fClosePic);
   if (fClosePicD) gClient->FreePicture(fClosePicD);
   if (fText) delete fText;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw little tab element.
 
void TGTabElement::DrawBorder()
{
   gVirtualX->DrawLine(fId, GetHilightGC()(), 0, fHeight-1, 0, 2);
   gVirtualX->DrawLine(fId, GetHilightGC()(), 0, 2, 2, 0);
   gVirtualX->DrawLine(fId, GetHilightGC()(), 2, 0, fWidth-3, 0);
   gVirtualX->DrawLine(fId, GetShadowGC()(),  fWidth-2, 1, fWidth-2, fHeight-1);
   if (gClient->GetStyle() < 2) {
      gVirtualX->DrawLine(fId, GetBlackGC()(), fWidth-2, 1, fWidth-1, 2);
      gVirtualX->DrawLine(fId, GetBlackGC()(), fWidth-1, 2, fWidth-1, fHeight-2);
   }
   gVirtualX->DrawLine(fId, GetHilightGC()(), fWidth-1, fHeight-1, fWidth-1, fHeight-1);
 
   if (fText) {
      int max_ascent, max_descent;
      gVirtualX->GetFontProperties(fFontStruct, max_ascent, max_descent);
      if (fEnabled) {
         fText->Draw(fId, fNormGC, 6, max_ascent+3);
      } else {
         fText->Draw(fId, GetHilightGC()(), 7, max_ascent + 1);
         fText->Draw(fId, GetShadowGC()(), 6, max_ascent);
      }
   }
   if (fShowClose && fClosePic && fClosePicD) {
      if (fEnabled && fActive)
         fClosePic->Draw(fId, fNormGC, fTWidth+12, fHeight/2-7);
      else
         fClosePicD->Draw(fId, fNormGC, fTWidth+12, fHeight/2-7);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle button event in the tab widget. Basically we only handle
/// button and scroll events in the small tabs.
 
Bool_t TGTabElement::HandleButton(Event_t *event)
{
   if (event->fCode == kButton4 || event->fCode == kButton5) { //scroll wheel events
      if (fParent) {
         TGTab* main = (TGTab*)fParent;
         if (main->IsScrollingEnabled())
         {
            if (event->fCode == kButton4) { //scroll up = move left, as in Firefox
               for (Int_t c = main->GetCurrent() - 1; c >= 0; --c) {
                  if (main->GetTabTab(c)->IsEnabled()) {
                     // change tab and generate event
                     main->SetTab(c);
                     break;
                  }
               }
            } else if (event->fCode == kButton5) { //scroll down = move right, as in Firefox
               for (Int_t c = main->GetCurrent() + 1; c < main->GetNumberOfTabs(); ++c) {
                  if (main->GetTabTab(c)->IsEnabled()) {
                     // change tab and generate event
                     main->SetTab(c);
                     break;
                  }
               }
            }
         }
      }
   } else if (event->fType == kButtonPress)  { //normal button press events
       TGTab* main = (TGTab*)fParent;
       if (main) {
          if (fShowClose && event->fWindow == GetId() &&
             (UInt_t)event->fX > fTWidth+12 && (UInt_t)event->fX < fTWidth+26 &&
             (UInt_t)event->fY > fHeight/2-7 && (UInt_t)event->fY < fHeight/2+7) {
             if (main->GetTabTab(main->GetCurrent()) == this) {
                 main->CloseTab(main->GetCurrent()); // emit signal
                 //main->RemoveTab(main->GetCurrent());
                 return kTRUE;
             }
          }
          TGFrameElement *el;
          TIter next(main->GetList());
 
          next();   // skip first container
 
          Int_t i = 0;
          Int_t c = main->GetCurrent();
          while ((el = (TGFrameElement *) next())) {
              if (el->fFrame->GetId() == (Window_t)event->fWindow)
                  c = i;
              next(); i++;
          }
 
          // change tab and generate event
          main->SetTab(c);
      }
   }
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return default size of tab element.
 
TGDimension TGTabElement::GetDefaultSize() const
{
   if (fShowClose && fClosePic && fClosePicD)
      return TGDimension(std::max(fTWidth+30, (UInt_t)45), fTHeight+6);
   else
      return TGDimension(std::max(fTWidth+12, (UInt_t)45), fTHeight+6);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set new tab text.
 
void TGTabElement::SetText(TGString *text)
{
   if (fText) delete fText;
   fText = text;
 
   int max_ascent, max_descent;
   fTWidth = gVirtualX->TextWidth(fFontStruct, fText->GetString(), fText->GetLength());
   gVirtualX->GetFontProperties(fFontStruct, max_ascent, max_descent);
   fTHeight = max_ascent + max_descent;
 
   fClient->NeedRedraw(this);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Show/hide close icon on the tab element, then apply layout
/// to compute correct elements size.
 
void TGTabElement::ShowClose(Bool_t show)
{
   TGTab* main = (TGTab*)fParent;
   fShowClose = show;
   if (fShowClose && fClosePic && fClosePicD)
      Resize(std::max(fTWidth+30, (UInt_t)45), fTHeight+6);
   else
      Resize(std::max(fTWidth+12, (UInt_t)45), fTHeight+6);
   if (main)
      main->GetLayoutManager()->Layout();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create a tab layout manager.
 
TGTabLayout::TGTabLayout(TGTab *main)
{
   fMain = main;
   fList = fMain->GetList();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Layout the tab widget.
 
void TGTabLayout::Layout()
{
   Int_t  i, xtab;
   UInt_t tw;
   UInt_t tabh = fMain->GetTabHeight(), bw = fMain->GetBorderWidth();
   UInt_t w = fMain->GetWidth();
   UInt_t h = fMain->GetHeight();
 
   xtab = 2;
 
   fMain->GetContainer()->MoveResize(0, tabh, w, h - tabh);
 
   // first frame is the container, so take next...
   TGFrameElement *el, *elnxt;
   TIter next(fList);
   i = 0;
   next();   // skip first
   while ((el = (TGFrameElement *) next())) {
      elnxt = (TGFrameElement *) next();
      tw = el->fFrame->GetDefaultWidth();
      if (i == fMain->GetCurrent()) {
         el->fFrame->MoveResize(xtab-2, 0, tw+3, tabh+1);
         if (elnxt) elnxt->fFrame->RaiseWindow();
         el->fFrame->RaiseWindow();
      } else {
         el->fFrame->MoveResize(xtab, 2, tw, tabh-1);
         el->fFrame->LowerWindow();
      }
      UInt_t nw = (w - (bw << 1));
      if (nw > 32768) nw = 1;
      UInt_t nh = (h - tabh - (bw << 1));
      if (nh > 32768) nh = 1;
      if (elnxt) {
         elnxt->fFrame->MoveResize(bw, tabh + bw, nw, nh);
         elnxt->fFrame->Layout();
      }
      xtab += (Int_t)tw;
      i++;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Get default size of tab widget.
 
TGDimension TGTabLayout::GetDefaultSize() const
{
   TGDimension dsize, dsize_te;
   TGDimension size(0,0), size_te(0,0);
 
   TGFrameElement *el, *elnxt;
   TIter next(fList);
   next();   // skip first container
   while ((el = (TGFrameElement *)next())) {
      dsize_te = el->fFrame->GetDefaultSize();
      size_te.fWidth += dsize_te.fWidth;
      elnxt = (TGFrameElement *) next();
      if (elnxt) {
         dsize = elnxt->fFrame->GetDefaultSize();
         if (size.fWidth < dsize.fWidth) size.fWidth = dsize.fWidth;
         if (size.fHeight < dsize.fHeight) size.fHeight = dsize.fHeight;
      }
   }
 
   // check if tab elements make a larger width than the containers
   if (size.fWidth < size_te.fWidth) size.fWidth = size_te.fWidth;
 
   size.fWidth += fMain->GetBorderWidth() << 1;
   size.fHeight += fMain->GetTabHeight() + (fMain->GetBorderWidth() << 1);
 
   return size;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Create tab widget.
 
TGTab::TGTab(const TGWindow *p, UInt_t w, UInt_t h,
             GContext_t norm, FontStruct_t font,
             UInt_t options, Pixel_t back) :
   TGCompositeFrame(p, w, h, options, back)
{
   fMsgWindow  = p;
 
   fBorderWidth = 2;
   fCurrent     = 0;
   fRemoved     = new TList;
 
   fNormGC     = norm;
   fFontStruct = font;
 
   fScrolling  = kFALSE;
 
   int max_ascent, max_descent;
   gVirtualX->GetFontProperties(fFontStruct, max_ascent, max_descent);
   fTabh = max_ascent + max_descent + 6;
 
   SetLayoutManager(new TGTabLayout(this));
 
   // we need this in order to avoid border blinking when switching tabs...
   fContainer = new TGCompositeFrame(this, fWidth, fHeight - fTabh,
                       kVerticalFrame | kRaisedFrame | kDoubleBorder);
   AddFrame(fContainer, 0);
 
   fEditDisabled = kEditDisable | kEditDisableLayout;
   fContainer->SetEditDisabled(kEditDisable | kEditDisableGrab);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete tab widget. This deletes the tab windows and the containers.
/// The tab string is deleted by the TGTabElement dtor.
 
TGTab::~TGTab()
{
   Cleanup();
   fRemoved->Delete();
   delete fRemoved;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Add a tab to the tab widget. Returns the new container, which
/// is owned by the tab widget. The text is adopted by the tab widget.
 
TGCompositeFrame *TGTab::AddTab(TGString *text)
{
   TGTabElement *te = new TGTabElement(this, text, 50, 20, fNormGC, fFontStruct);
   AddFrame(te, 0);
 
   TGCompositeFrame* cf = new TGCompositeFrame(this, fWidth, fHeight-21);
   AddFrame(cf, 0);
   cf->SetEditDisabled(kEditDisableResize);
 
   te->MapWindow();
   cf->MapWindow();
 
   return cf;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Add a tab to the tab widget. Returns the new container. The container
/// is owned by the tab widget.
 
TGCompositeFrame *TGTab::AddTab(const char *text)
{
   return AddTab(new TGString(text));
}
 
////////////////////////////////////////////////////////////////////////////////
/// Add a tab to the tab widget and fill it with given TGCompositeFrame.
 
void TGTab::AddTab(const char *text, TGCompositeFrame *cf)
{
   AddTab(new TGString(text), cf);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Add a tab to the tab widget and fill it with given TGCompositeFrame.
 
void TGTab::AddTab(TGString *text, TGCompositeFrame *cf)
{
   TGTabElement *te = new TGTabElement(this, text, 50, 20, fNormGC, fFontStruct);
   AddFrame(te, 0);
 
   AddFrame(cf, 0);
   cf->SetEditDisabled(kEditDisableResize);
 
   te->MapWindow();
   cf->MapWindow();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Remove container and tab of tab with index tabIndex.
/// Does NOT remove the container contents!
 
void TGTab::RemoveTab(Int_t tabIndex, Bool_t storeRemoved)
{
   if (tabIndex < 0) {
      tabIndex = fCurrent;
   }
 
   TGFrameElement *elTab, *elCont;
   Int_t  count = 0;
 
   // Notify (signal) for removed tab "tabIndex"
   Removed(tabIndex);
 
   TIter next(fList) ;
   next() ; // skip first container
 
   while ((elTab = (TGFrameElement *) next())) {
      elCont = (TGFrameElement *) next();
 
      if (count == tabIndex) {
         elCont->fFrame->UnmapWindow();   // will be destroyed later
         TGFrame *frame = elTab->fFrame;
         RemoveFrame(elTab->fFrame);
         frame->DestroyWindow();
         delete frame;
         if (storeRemoved)
            fRemoved->Add(elCont->fFrame);   // delete only in dtor
         RemoveFrame(elCont->fFrame);
         if (tabIndex == fCurrent) {
            // select another tab only if the current is the one we delete
            SetTab(0);
         } else
            fCurrent--;
         break;
      }
      count++;
   }
 
   GetLayoutManager()->Layout();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Enable or disable tab.
 
void TGTab::SetEnabled(Int_t tabIndex, Bool_t on)
{
   TGTabElement *te = GetTabTab(tabIndex);
   if (te) {
      te->SetEnabled(on);
      fClient->NeedRedraw(te);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Returns true if tab scrolling is enabled.
 
Bool_t TGTab::IsScrollingEnabled() const
{
   return fScrolling;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Enable or disable tab scrolling.
 
void TGTab::SetScrollingEnabled(Bool_t on)
{
   fScrolling = on;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Returns true if tab is enabled.
 
Bool_t TGTab::IsEnabled(Int_t tabIndex) const
{
   TGTabElement *te = GetTabTab(tabIndex);
 
   return te ? te->IsEnabled() : kFALSE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Make tabIdx the current tab. Utility method called by SetTab and
/// HandleButton().
 
void TGTab::ChangeTab(Int_t tabIndex, Bool_t emit)
{
   TGTabElement *te = GetTabTab(tabIndex);
   if (!te || !te->IsEnabled()) return;
 
   if (tabIndex != fCurrent) {
      if (GetTabTab(fCurrent)) {
         GetTabTab(fCurrent)->SetActive(kFALSE);
         fClient->NeedRedraw(GetTabTab(fCurrent));
      }
      TGFrameElement *el, *elnxt;
      UInt_t tw;
      Int_t  xtab  = 2;
      Int_t  count = 0;
 
      TIter next(fList);
      next();           // skip first container
 
      fCurrent = tabIndex;
      while ((el = (TGFrameElement *) next())) {
         elnxt = (TGFrameElement *) next();
         tw = el->fFrame->GetDefaultWidth();
         if (count == fCurrent) {
            el->fFrame->MoveResize(xtab-2, 0, tw+3, fTabh+1);
            if (elnxt) elnxt->fFrame->RaiseWindow();
            el->fFrame->RaiseWindow();
         } else {
            el->fFrame->MoveResize(xtab, 2, tw, fTabh-1);
            el->fFrame->LowerWindow();
         }
         xtab += tw;
         count++;
      }
      if (emit) {
         SendMessage(fMsgWindow, MK_MSG(kC_COMMAND, kCM_TAB), fCurrent, 0);
         fClient->ProcessLine(fCommand, MK_MSG(kC_COMMAND, kCM_TAB), fCurrent, 0);
         Selected(fCurrent);
      }
      GetTabTab(fCurrent)->SetActive(kTRUE);
      fClient->NeedRedraw(GetTabTab(fCurrent));
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Brings the composite frame with the index tabIndex to the
/// front and generate the following event if the front tab has changed:
/// kC_COMMAND, kCM_TAB, tab id, 0.
/// Returns kFALSE if tabIndex is a not valid index
 
Bool_t TGTab::SetTab(Int_t tabIndex, Bool_t emit)
{
   // check if tabIndex is a valid index
   if (tabIndex < 0)
      return kFALSE;
 
   // count the tabs
   TIter next(fList);
   Int_t count = 0;
   while (next())
      count++;
 
   count = count / 2 - 1;
   if (tabIndex > count)
      return kFALSE;
 
   // change tab and generate event
   ChangeTab(tabIndex, emit);
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Brings the composite frame with the name to the
/// front and generate the following event if the front tab has changed:
/// kC_COMMAND, kCM_TAB, tab id, 0.
/// Returns kFALSE if tab with name does not exist.
 
Bool_t TGTab::SetTab(const char *name, Bool_t emit)
{
   TGFrameElement *el;
   Int_t  count = 0;
   TGTabElement *tab = 0;
 
   TIter next(fList);
   next();           // skip first container
 
   while ((el = (TGFrameElement *) next())) {
      next();        // skip tab container
      tab = (TGTabElement *)el->fFrame;
 
      if (*(tab->GetText()) == name) {
         // change tab and generate event
         ChangeTab(count, emit);
         return kTRUE;
      }
      count++;
   }
 
   return kFALSE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return container of tab with index tabIndex.
/// Return 0 in case tabIndex is out of range.
 
TGCompositeFrame *TGTab::GetTabContainer(Int_t tabIndex) const
{
   if (tabIndex < 0) return 0;
 
   TGFrameElement *el;
   Int_t  count = 0;
 
   TIter next(fList);
   next();           // skip first container
 
   while (next()) {
      el = (TGFrameElement *) next();
      if (el && count == tabIndex)
         return (TGCompositeFrame *) el->fFrame;
      count++;
   }
 
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the tab container of tab with string name.
/// Returns 0 in case name is not found.
 
TGCompositeFrame *TGTab::GetTabContainer(const char *name) const
{
   TGFrameElement *el;
   TGTabElement *tab = 0;
   TGCompositeFrame *comp = 0;
 
   TIter next(fList);
   next();
 
   while ((el = (TGFrameElement *) next())) {
      tab  = (TGTabElement *) el->fFrame;
      el   = (TGFrameElement *) next();
      comp = (TGCompositeFrame *) el->fFrame;
      if (*tab->GetText() == name){
         return comp;
      }
   }
 
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the tab element of tab with index tabIndex.
/// Returns 0 in case tabIndex is out of range.
 
TGTabElement *TGTab::GetTabTab(Int_t tabIndex) const
{
   if (tabIndex < 0) return 0;
 
   TGFrameElement *el;
   Int_t  count = 0;
 
   TIter next(fList);
   next();           // skip first container
 
   while ((el = (TGFrameElement *) next())) {
      next();
      if (count == tabIndex)
         return (TGTabElement *) el->fFrame;
      count++;
   }
 
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the tab element of tab with string name.
/// Returns 0 in case name is not found.
 
TGTabElement *TGTab::GetTabTab(const char *name) const
{
   TGFrameElement *el;
   TGTabElement *tab = 0;
 
   TIter next(fList);
   next();
 
   while ((el = (TGFrameElement *) next())) {
      tab = (TGTabElement *)el->fFrame;
      if (name == *(tab->GetText())) {
         return tab;
      }
      next();
   }
 
   return 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return number of tabs.
 
Int_t TGTab::GetNumberOfTabs() const
{
   Int_t count = 0;
 
   TIter next(fList);
   next();           // skip first container
 
   while (next()) {
      next();
      count++;
   }
 
   return count;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return default font structure in use.
 
FontStruct_t TGTab::GetDefaultFontStruct()
{
   if (!fgDefaultFont)
      fgDefaultFont = gClient->GetResourcePool()->GetDefaultFont();
   return fgDefaultFont->GetFontStruct();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return default graphics context in use.
 
const TGGC &TGTab::GetDefaultGC()
{
   if (!fgDefaultGC)
      fgDefaultGC = gClient->GetResourcePool()->GetFrameGC();
   return *fgDefaultGC;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create new tab. Used in context menu.
 
void TGTab::NewTab(const char *text)
{
   TString name;
   if (text)
      name = text;
   else
      name = TString::Format("tab%d", GetNumberOfTabs()+1);
   AddTab(name.Data());
 
   GetLayoutManager()->Layout();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set text to current tab.
 
void TGTab::SetText(const char *text)
{
   if (GetCurrentTab()) GetCurrentTab()->SetText(new TGString(text));
   GetLayoutManager()->Layout();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return layout manager.
 
TGLayoutManager *TGTab::GetLayoutManager() const
{
   TGTab *tab = (TGTab*)this;
 
   if (tab->fLayoutManager->IsA() != TGTabLayout::Class()) {
      tab->SetLayoutManager(new TGTabLayout(tab));
   }
 
   return tab->fLayoutManager;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save a tab widget as a C++ statement(s) on output stream out.
 
void TGTab::SavePrimitive(std::ostream &out, Option_t *option /*= ""*/)
{
   // font + GC
   option = GetName() + 5; // unique digit id of the name
   TString parGC, parFont;
   parFont.Form("%s::GetDefaultFontStruct()", IsA()->GetName());
   parGC.Form("%s::GetDefaultGC()()", IsA()->GetName());
 
   if ((GetDefaultFontStruct() != fFontStruct) || (GetDefaultGC()() != fNormGC)) {
      TGFont *ufont = gClient->GetResourcePool()->GetFontPool()->FindFont(fFontStruct);
      if (ufont) {
         ufont->SavePrimitive(out, option);
         parFont.Form("ufont->GetFontStruct()");
      }
 
      TGGC *userGC = gClient->GetResourcePool()->GetGCPool()->FindGC(fNormGC);
      if (userGC) {
         userGC->SavePrimitive(out, option);
         parGC.Form("uGC->GetGC()");
      }
   }
 
   auto extra_args = SaveCtorArgs(out);
 
   out << "\n   // tab widget\n";
 
   out << "   TGTab *" << GetName() << " = new TGTab(" << fParent->GetName() << "," << GetWidth() << "," << GetHeight();
 
   if (!extra_args.IsNull() || (fFontStruct != GetDefaultFontStruct()))
      out << "," << parGC << "," << parFont << extra_args;
   else if (fNormGC != GetDefaultGC()())
      out << "," << parGC;
   out << ");\n";
 
   if (option && strstr(option, "keep_names"))
      out << "   " << GetName() << "->SetName(\"" << GetName() << "\");\n";
 
   for (Int_t i = 0; i < GetNumberOfTabs(); i++) {
      auto cf = GetTabContainer(i);
      if (!cf || !GetTabTab(i))
         continue;
      out << "\n   // container of \"" << GetTabTab(i)->GetString() << "\"\n";
      out << "   TGCompositeFrame *" << cf->GetName() << " = " << GetName() << "->AddTab(\""
          << GetTabTab(i)->GetString() << "\");\n";
      auto lm = cf->GetLayoutManager();
      if (lm) {
         if (!((cf->GetOptions() & kHorizontalFrame) && lm->InheritsFrom(TGHorizontalLayout::Class())) &&
             !((GetOptions() & kVerticalFrame) && lm->InheritsFrom(TGVerticalLayout::Class()))) {
            out << "   " << cf->GetName() << "->SetLayoutManager(";
            lm->SavePrimitive(out, option);
            out << ");\n";
         }
         if (!IsEnabled(i)) {
            out << "   " << GetName() << "->SetEnabled(" << i << ", kFALSE);\n";
         }
      }
      cf->SavePrimitiveSubframes(out, option);
 
      if (GetTabTab(i)->IsCloseShown()) {
         out << "   TGTabElement *tab" << i << " = " << GetName() << "->GetTabTab(" << i << ");\n";
         out << "   tab" << i << "->ShowClose(kTRUE);\n";
      }
      if (GetTabTab(i)->GetBackground() != GetTabTab(i)->GetDefaultFrameBackground()) {
         GetTabTab(i)->SaveUserColor(out, option);
         out << "   TGTabElement *tab" << i << " = " << GetName() << "->GetTabTab(" << i << ");\n";
         out << "   tab" << i << "->ChangeBackground(ucolor);\n";
      }
   }
   out << "\n   " << GetName() << "->SetTab(" << GetCurrent() << ");\n";
   out <<  "   " << GetName() << "->Resize(" << GetName() << "->GetDefaultSize());\n";
}
 
// __________________________________________________________________________
void TGTabLayout::SavePrimitive(std::ostream &out, Option_t * /*= ""*/)
{
   // Save tab layout manager as a C++ statement(s) on out stream.
 
   out << "new TGTabLayout(" << fMain->GetName() << ")";
 
}