    // @(#)root/gui:$Name:  $:$Id: TGLayout.cxx,v 1.17 2004/10/25 12:39:56 rdm Exp $
    // Author: Fons Rademakers   02/01/98

    /*************************************************************************
     * 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.

    **************************************************************************/

    //////////////////////////////////////////////////////////////////////////
    //                                                                      //
    // A number of different layout classes (TGLayoutManager,               //
    // TGVerticalLayout, TGHorizontalLayout, TGLayoutHints, etc.).          //
    //                                                                      //
    //                                                                      //
    // Concerning the TGMatrixLayout class:                                 //
    //                                                                      //
    // It arranges frames in a matrix-like way.                             //
    // This manager provides :                                              //
    // - a column number (0 means unlimited)                                //
    // - a row number (0 means unlimited)                                   //
    // - horizontal & vertical separators                                   //
    //                                                                      //
    // Notes : If both column and row are fixed values, any remaining       //
    //         frames outside the count won't be managed.                   //
    //         Unlimited rows means the frame can expand downward           //
    //         (the default behaviour in most UI).                          //
    //         Both unlimited rows and columns is undefined (read: will     //
    //         crash the algorithm ;-).                                     //
    //         With fixed dimensions, frames are always arranged in rows.   //
    //         That is: 1st frame is at position (0,0), next one is at      //
    //         row(0), column(1) and so on...                               //
    //         When specifying one dimension as unlimited (i.e. row=0 or    //
    //         column=0) the frames are arranged according to the direction //
    //         of the fixed dimension. This layout manager does not make    //
    //         use of TGLayoutHints.                                        //
    //                                                                      //
    //////////////////////////////////////////////////////////////////////////

    #include "TGLayout.h"
    #include "TGFrame.h"
    #include "TList.h"
    #include "TMath.h"
    #include "Riostream.h"

    ClassImp(TGLayoutHints)
    ClassImp(TGLayoutManager)
    ClassImp(TGVerticalLayout)
    ClassImp(TGHorizontalLayout)
    ClassImp(TGRowLayout)
    ClassImp(TGColumnLayout)
    ClassImp(TGMatrixLayout)
    ClassImp(TGTileLayout)
    ClassImp(TGListLayout)
    ClassImp(TGListDetailsLayout)

    //______________________________________________________________________________
    TGFrameElement::TGFrameElement(TGFrame *f, TGLayoutHints *l)
    {
       // ctor

       fFrame  = f;
       if (f) f->SetFrameElement(this);

       if (l) {
          l->AddReference();
          fLayout = l;
          l->fPrev = l->fFE;
          l->fFE = this;
       }
       fState = 1;
    }

    //______________________________________________________________________________
    TGFrameElement::~TGFrameElement()
    {
       // destructor. Decrease ref.count of fLayout

    }

    //______________________________________________________________________________
    void TGFrameElement::Print(Option_t *option) const
    {
       // print this

       TObject::Print(option);

       cout << "\t";
       if (fFrame) {
          cout << fFrame->ClassName() << "::" << fFrame->GetName();
       }
       if (fLayout) {
          fLayout->Print(option);
       }
       cout << endl;
    }

    //______________________________________________________________________________
    TGLayoutHints::TGLayoutHints(const TGLayoutHints &lh) : TObject(lh), TRefCnt(lh)
    {
       // ctor

       fPadleft = lh.fPadleft; fPadright = lh.fPadright;
       fPadtop  = lh.fPadtop;  fPadbottom = lh.fPadbottom;
       fLayoutHints = lh.fLayoutHints;
       SetRefCount(0);
       fFE = lh.fFE; fPrev = lh.fPrev;
    }

    //______________________________________________________________________________
    TGLayoutHints::~TGLayoutHints()
    {
       // dtor

    }

    //______________________________________________________________________________
    void TGLayoutHints::UpdateFrameElements(TGLayoutHints *l)
    {
       //

       if (fFE) fFE->fLayout = l;
       else return;

       TGFrameElement *p = fPrev;

       while (p && p->fLayout) {
          p->fLayout = l;
          p = p->fLayout->fPrev;
       }
    }

    //______________________________________________________________________________
    void TGLayoutHints::Print(Option_t *) const
    {
       // Printing.

       Bool_t bor = kFALSE;

       if (fLayoutHints & kLHintsLeft) {
          cout << "kLHintsLeft";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsCenterX) {
          if (bor) cout << " | ";
          cout << "kLHintsCenterX";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsRight) {
          if (bor) cout << " | ";
          cout << "kLHintsRight";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsTop) {
          if (bor) cout << " | ";
          cout << "kLHintsTop";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsCenterY) {
          if (bor) cout << " | ";
          cout << "kLHintsCenterY";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsBottom) {
          if (bor) cout << " | ";
          cout << "kLHintsBottom";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsExpandX) {
          if (bor) cout << " | ";
          cout << "kLHintsExpandX";
          bor = kTRUE;
       }
       if (fLayoutHints & kLHintsExpandY) {
          if (bor) cout << " | ";
          cout << "kLHintsExpandY";
          bor = kTRUE;
       }
       if (fLayoutHints == kLHintsNoHints) {
          if (bor) cout << " | ";
          cout << "kLHintsNoHints";
       }
       cout << ", fPadtop="    << fPadtop;
       cout << ", fPadbottom=" << fPadbottom;
       cout << ", fPadleft="   << fPadleft;
       cout << ", fPadright="  << fPadright;
       cout << endl;
    }

    //______________________________________________________________________________
    TGVerticalLayout::TGVerticalLayout(TGCompositeFrame *main)
    {
       // Create vertical layout manager.

       fMain = main;
       fList = fMain->GetList();
    }

    //______________________________________________________________________________
    void TGVerticalLayout::Layout()
    {
       // Make a vertical layout of all frames in the list.

       TGFrameElement *ptr;
       TGLayoutHints  *layout;
       Int_t    nb_expand = 0;
       Int_t    top, bottom;
       ULong_t  hints;
       UInt_t   extra_space = 0;
       Int_t    exp = 0;
       Int_t    exp_max = 0;
       Int_t    remain;
       Int_t    x = 0, y = 0;
       Int_t    bw = fMain->GetBorderWidth();
       TGDimension size, csize;
       TGDimension msize = fMain->GetSize();
       UInt_t pad_left, pad_top, pad_right, pad_bottom;
       Int_t size_expand=0, esize_expand=0, rem_expand=0, tmp_expand = 0;

       if (!fList) return;

       bottom = msize.fHeight - (top = bw);
       remain = msize.fHeight - (bw << 1);

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             layout = ptr->fLayout;
             size = ptr->fFrame->GetDefaultSize();
             size.fHeight += layout->GetPadTop() + layout->GetPadBottom();
             hints = layout->GetLayoutHints();
             if ((hints & kLHintsExpandY) || (hints & kLHintsCenterY)) {
                nb_expand++;
                exp += size.fHeight;
                if (hints & kLHintsExpandY) exp_max = 0;
                else exp_max = TMath::Max(exp_max, (Int_t)size.fHeight);
             } else {
                remain -= size.fHeight;
                if (remain < 0)
                   remain = 0;
             }
          }
       }

       if (nb_expand) {
          size_expand = remain/nb_expand;

          if (size_expand < exp_max)
             esize_expand = (remain - exp)/nb_expand;
          rem_expand = remain % nb_expand;
       }

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             hints = (layout = ptr->fLayout)->GetLayoutHints();
             csize      = ptr->fFrame->GetDefaultSize();
             pad_left   = layout->GetPadLeft();
             pad_top    = layout->GetPadTop();
             pad_right  = layout->GetPadRight();
             pad_bottom = layout->GetPadBottom();

             if (hints & kLHintsRight) {
                x = msize.fWidth - bw - csize.fWidth - pad_right;
             } else if (hints & kLHintsCenterX) {
                x = (msize.fWidth - (bw << 1) - csize.fWidth) >> 1;
             } else { // defaults to kLHintsLeft
                x = pad_left + bw;
             }

             if (hints & kLHintsExpandX) {
                size.fWidth = msize.fWidth - (bw << 1) - pad_left - pad_right;
                x = pad_left + bw;
             } else {
                size.fWidth = csize.fWidth;
             }

             if (hints & kLHintsExpandY) {
                if (size_expand >= exp_max)
                   size.fHeight = size_expand - pad_top - pad_bottom;
                else
                   size.fHeight = csize.fHeight + esize_expand;

                tmp_expand += rem_expand;
                if (tmp_expand >= nb_expand) {
                   size.fHeight++;
                   tmp_expand -= nb_expand;
                }
             } else {
                size.fHeight = csize.fHeight;
                if (hints & kLHintsCenterY) {
                   if (size_expand >= exp_max) {
                      extra_space = (size_expand - pad_top - pad_bottom - size.fHeight) >> 1;
                   } else {
                      extra_space = esize_expand >> 1;
                   }
                   y += extra_space;
                   top += extra_space;
                }
             }

             if (hints & kLHintsBottom) {
                y = bottom - size.fHeight - pad_bottom;
                bottom -= size.fHeight + pad_top + pad_bottom;
             } else { // kLHintsTop by default
                y = top + pad_top;
                top += size.fHeight + pad_top + pad_bottom;
             }

             if (hints & kLHintsCenterY)
                top += extra_space;

             ptr->fFrame->MoveResize(x, y, size.fWidth, size.fHeight);
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGVerticalLayout::GetDefaultSize() const
    {
       // Return default dimension of the vertical layout.

       TGFrameElement *ptr;
       TGDimension     size(0,0), msize = fMain->GetSize(), csize;
       UInt_t options = fMain->GetOptions();

       if ((options & kFixedWidth) && (options & kFixedHeight))
          return msize;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             csize = ptr->fFrame->GetDefaultSize();
             size.fWidth = TMath::Max(size.fWidth, csize.fWidth + ptr->fLayout->GetPadLeft() +
                                      ptr->fLayout->GetPadRight());
             size.fHeight += csize.fHeight + ptr->fLayout->GetPadTop() +
                             ptr->fLayout->GetPadBottom();
          }
       }

       size.fWidth  += fMain->GetBorderWidth() << 1;
       size.fHeight += fMain->GetBorderWidth() << 1;

       if (options & kFixedWidth)  size.fWidth  = msize.fWidth;
       if (options & kFixedHeight) size.fHeight = msize.fHeight;

       return size;
    }

    //______________________________________________________________________________
    void TGHorizontalLayout::Layout()
    {
       // Make a horizontal layout of all frames in the list.

       TGFrameElement *ptr;
       TGLayoutHints  *layout;
       Int_t    nb_expand = 0;
       Int_t    left, right;
       ULong_t  hints;
       UInt_t   extra_space = 0;
       Int_t    exp = 0;
       Int_t    exp_max = 0;
       Int_t    remain;
       Int_t    x = 0, y = 0;
       Int_t    bw = fMain->GetBorderWidth();
       TGDimension size, csize;
       TGDimension msize = fMain->GetSize();
       UInt_t pad_left, pad_top, pad_right, pad_bottom;
       Int_t size_expand=0, esize_expand=0, rem_expand=0, tmp_expand = 0;

       if (!fList) return;

       right  = msize.fWidth - (left = bw);
       remain = msize.fWidth - (bw << 1);

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             layout  = ptr->fLayout;
             size    = ptr->fFrame->GetDefaultSize();
             size.fWidth += layout->GetPadLeft() + layout->GetPadRight();
             hints = layout->GetLayoutHints();
             if ((hints & kLHintsExpandX) || (hints & kLHintsCenterX)) {
                nb_expand++;
                exp += size.fWidth;
                if (hints & kLHintsExpandX) exp_max = 0;
                else exp_max = TMath::Max(exp_max, (Int_t)size.fWidth);
             } else {
                remain -= size.fWidth;
                if (remain < 0)
                   remain = 0;
             }
          }
       }
       if (nb_expand) {
          size_expand = remain/nb_expand;

          if (size_expand < exp_max) {
             esize_expand = (remain - exp)/nb_expand;
          }
          rem_expand = remain % nb_expand;
       }

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             hints = (layout = ptr->fLayout)->GetLayoutHints();
             csize      = ptr->fFrame->GetDefaultSize();
             pad_left   = layout->GetPadLeft();
             pad_top    = layout->GetPadTop();
             pad_right  = layout->GetPadRight();
             pad_bottom = layout->GetPadBottom();

             if (hints & kLHintsBottom) {
                y = msize.fHeight - bw - csize.fHeight - pad_bottom;
             } else if (hints & kLHintsCenterY) {
                y = (msize.fHeight - (bw << 1) - csize.fHeight) >> 1;
             } else { // kLHintsTop by default
                y = pad_top + bw;
             }

             if (hints & kLHintsExpandY) {
                size.fHeight = msize.fHeight - (bw << 1) - pad_top - pad_bottom;
                y = pad_top + bw;
             } else {
                size.fHeight = csize.fHeight;
             }

             if (hints & kLHintsExpandX) {
                if (size_expand >= exp_max)
                   size.fWidth = size_expand - pad_left - pad_right;
                else
                   size.fWidth = csize.fWidth +  esize_expand;

                tmp_expand += rem_expand;

                if (tmp_expand >= nb_expand) {
                   size.fWidth++;
                   tmp_expand -= nb_expand;
                }
             } else {
                size.fWidth = csize.fWidth;
                if (hints & kLHintsCenterX) {
                   if (size_expand >= exp_max) {
                      extra_space = (size_expand - pad_left - pad_right - size.fWidth)>> 1;
                   } else {
                      extra_space = esize_expand >> 1;
                   }
                   x += extra_space;
                   left += extra_space;
                }
             }

             if (hints & kLHintsRight) {
                x = right - size.fWidth - pad_right;
                right -= size.fWidth + pad_left + pad_right;
             } else { // defaults to kLHintsLeft
                x = left + pad_left;
                left += size.fWidth + pad_left + pad_right;
             }

             if (hints & kLHintsCenterX)
                left += extra_space;

             ptr->fFrame->MoveResize(x, y, size.fWidth, size.fHeight);
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGHorizontalLayout::GetDefaultSize() const
    {
       // Return default dimension of the horizontal layout.

       TGFrameElement *ptr;
       TGDimension     size(0,0), msize = fMain->GetSize(), csize;
       UInt_t options = fMain->GetOptions();

       if ((options & kFixedWidth) && (options & kFixedHeight))
          return msize;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             csize = ptr->fFrame->GetDefaultSize();
             size.fWidth += csize.fWidth + ptr->fLayout->GetPadLeft() +
                            ptr->fLayout->GetPadRight();

             size.fHeight = TMath::Max(size.fHeight, csize.fHeight + ptr->fLayout->GetPadTop() +
                                       ptr->fLayout->GetPadBottom());
          }
       }
       size.fWidth  += fMain->GetBorderWidth() << 1;
       size.fHeight += fMain->GetBorderWidth() << 1;

       if (options & kFixedWidth)  size.fWidth = msize.fWidth;
       if (options & kFixedHeight) size.fHeight = msize.fHeight;

       return size;
    }

    //______________________________________________________________________________
    void TGRowLayout::Layout()
    {
       // Make a row layout of all frames in the list.

       TGFrameElement *ptr;
       TGDimension     size;
       Int_t  bw = fMain->GetBorderWidth();
       Int_t  x = bw, y = bw;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             size = ptr->fFrame->GetDefaultSize();
             ptr->fFrame->Move(x, y);
             ptr->fFrame->Layout();
             x += size.fWidth + fSep;
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGRowLayout::GetDefaultSize() const
    {
      // Return default dimension of the row layout.

       TGFrameElement *ptr;
       TGDimension size(0,0), dsize, msize = fMain->GetSize();
       UInt_t options = fMain->GetOptions();

       if ((options & kFixedHeight) && (options & kFixedWidth))
          return msize;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             dsize   = ptr->fFrame->GetDefaultSize();
             size.fHeight  = TMath::Max(size.fHeight, dsize.fHeight);
             size.fWidth  += dsize.fWidth + fSep;
          }
       }

       size.fHeight += fMain->GetBorderWidth() << 1;
       size.fWidth  += fMain->GetBorderWidth() << 1;
       size.fWidth  -= fSep;

       if (options & kFixedHeight) size.fHeight = msize.fHeight;
       if (options & kFixedWidth)  size.fWidth  = msize.fWidth;

       return size;
    }

    //______________________________________________________________________________
    void TGColumnLayout::Layout()
    {
       // Make a column layout of all frames in the list.

       TGFrameElement *ptr;
       TGDimension     size;
       Int_t  bw = fMain->GetBorderWidth();
       Int_t  x = bw, y = bw;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             size = ptr->fFrame->GetDefaultSize();
             ptr->fFrame->Move(x, y);
             ptr->fFrame->Layout();
             y += size.fHeight + fSep;
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGColumnLayout::GetDefaultSize() const
    {
      // Return default dimension of the column layout.

       TGFrameElement *ptr;
       TGDimension     size(0,0), dsize, msize = fMain->GetSize();
       UInt_t options = fMain->GetOptions();

       if (options & kFixedHeight && options & kFixedWidth)
          return msize;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             dsize   = ptr->fFrame->GetDefaultSize();
             size.fHeight += dsize.fHeight + fSep;
             size.fWidth   = TMath::Max(size.fWidth, dsize.fWidth);
          }
       }

       size.fHeight += fMain->GetBorderWidth() << 1;
       size.fHeight -= fSep;
       size.fWidth  += fMain->GetBorderWidth() << 1;

       if (options & kFixedHeight) size.fHeight = msize.fHeight;
       if (options & kFixedWidth)  size.fWidth  = msize.fWidth;

       return size;
    }

    //______________________________________________________________________________
    TGMatrixLayout::TGMatrixLayout(TGCompositeFrame *main, UInt_t r, UInt_t c,
                                   Int_t s, Int_t h)
    {
       // TGMatrixLayout constructor.

       fMain    = main;
       fList    = fMain->GetList();
       fSep     = s;
       fHints   = h;
       fRows    = r;
       fColumns = c;
    }

    //______________________________________________________________________________
    void TGMatrixLayout::Layout()
    {
       // Make a matrix layout of all frames in the list.

       TGFrameElement *ptr;
       TGDimension csize, maxsize(0,0);
       Int_t bw = fMain->GetBorderWidth();
       Int_t x = fSep, y = fSep + bw;
       UInt_t rowcount = fRows, colcount = fColumns;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          csize = ptr->fFrame->GetDefaultSize();
          maxsize.fWidth  = TMath::Max(maxsize.fWidth, csize.fWidth);
          maxsize.fHeight = TMath::Max(maxsize.fHeight, csize.fHeight);
       }

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          ptr->fFrame->Move(x, y);
          ptr->fFrame->Layout();

          if (fColumns == 0) {
             y += maxsize.fHeight + fSep;
             rowcount--;
             if (rowcount <= 0) {
                rowcount = fRows;
                y = fSep + bw; x += maxsize.fWidth + fSep;
             }
          } else if (fRows == 0) {
             x += maxsize.fWidth + fSep;
             colcount--;
             if (colcount <= 0) {
                colcount = fColumns;
                x = fSep; y += maxsize.fHeight + fSep;
             }
          } else {
             x += maxsize.fWidth + fSep;
             colcount--;
             if (colcount <= 0) {
                rowcount--;
                if (rowcount <= 0) return;
                else {
                   colcount = fColumns;
                   x = fSep; y += maxsize.fHeight + fSep;
                }
             }
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGMatrixLayout::GetDefaultSize() const
    {
       // Return default dimension of the matrix layout.

       TGFrameElement *ptr;
       TGDimension     size, csize, maxsize(0,0);
       Int_t           count = 0;
       Int_t           bw = fMain->GetBorderWidth();

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          count++;
          csize = ptr->fFrame->GetDefaultSize();
          maxsize.fWidth  = TMath::Max(maxsize.fWidth, csize.fWidth);
          maxsize.fHeight = TMath::Max(maxsize.fHeight, csize.fHeight);
       }

       if (fRows == 0) {
          Int_t rows = (count % fColumns) ? (count / fColumns + 1) : (count / fColumns);
          size.fWidth  = fColumns * (maxsize.fWidth + fSep) + fSep;
          size.fHeight = rows * (maxsize.fHeight + fSep) + fSep + bw;
       } else if (fColumns == 0) {
          Int_t cols = (count % fRows) ? (count / fRows + 1) : (count / fRows);
          size.fWidth  = cols * (maxsize.fWidth + fSep) + fSep;
          size.fHeight = fRows * (maxsize.fHeight + fSep) + fSep + bw;
       } else {
          size.fWidth  = fColumns * (maxsize.fWidth + fSep) + fSep;
          size.fHeight = fRows * (maxsize.fHeight + fSep) + fSep + bw;
       }
       return size;
    }

    //______________________________________________________________________________
     TGTileLayout::TGTileLayout(TGCompositeFrame *main, Int_t sep)
    {
       // Create a tile layout manager.

       fMain = main;
       fSep  = sep;
       fList = fMain->GetList();
    }

    //______________________________________________________________________________
     void TGTileLayout::Layout()
    {
       // Make a tile layout of all frames in the list.

       TGFrameElement *ptr;
       Int_t   x, y, xw, yw;
       UInt_t  max_width;
       ULong_t hints;
       TGDimension csize, max_osize(0,0), msize = fMain->GetSize();

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          csize = ptr->fFrame->GetDefaultSize();
          max_osize.fWidth  = TMath::Max(max_osize.fWidth, csize.fWidth);
          max_osize.fHeight = TMath::Max(max_osize.fHeight, csize.fHeight);
       }

       max_width = TMath::Max(msize.fWidth, max_osize.fWidth + (fSep << 1));
       x = fSep; y = fSep << 1;

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          hints = ptr->fLayout->GetLayoutHints();
          csize = ptr->fFrame->GetDefaultSize();

          if (hints & kLHintsCenterX)
             xw = x + (Int_t)((max_osize.fWidth - csize.fWidth) >> 1);
          else if (hints & kLHintsRight)
             xw = x + (Int_t)max_osize.fWidth - (Int_t)csize.fWidth;
          else // defaults to kLHintsLeft
             xw = x;

          if (hints & kLHintsCenterY)
             yw = y + (Int_t)((max_osize.fHeight - csize.fHeight) >> 1);
          else if (hints & kLHintsBottom)
             yw = y + (Int_t)max_osize.fHeight - (Int_t)csize.fHeight;
          else // defaults to kLHintsTop
             yw = y;

          ptr->fFrame->Move(xw, yw);
          x += (Int_t)max_osize.fWidth + fSep;

          if (x + max_osize.fWidth > max_width) {
             x = fSep;
             y += (Int_t)max_osize.fHeight + fSep + (fSep >> 1);
          }
       }
    }

    //______________________________________________________________________________
     TGDimension TGTileLayout::GetDefaultSize() const
    {
       // Return default dimension of the tile layout.

       TGFrameElement *ptr;
       Int_t x, y;
       TGDimension max_size, max_osize(0,0), msize = fMain->GetSize();

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          max_size = ptr->fFrame->GetDefaultSize();
          max_osize.fWidth  = TMath::Max(max_osize.fWidth, max_size.fWidth);
          max_osize.fHeight = TMath::Max(max_osize.fHeight, max_size.fHeight);
       }

       max_size.fWidth = TMath::Max(msize.fWidth, max_osize.fWidth + (fSep << 1));

       x = fSep; y = fSep << 1;

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          x += max_osize.fWidth + fSep;
          if (x + max_osize.fWidth > max_size.fWidth) {
             x = fSep;
             y += (Int_t)max_osize.fHeight + fSep + (fSep >> 1);  // 3/2
          }
       }
       if (x != fSep) y += max_osize.fHeight + fSep;
       max_size.fHeight = TMath::Max(y, (Int_t)msize.fHeight);

       return max_size;
    }

    //______________________________________________________________________________
    void TGListLayout::Layout()
    {
       // Make a tile layout of all frames in the list.

       TGFrameElement *ptr;
       Int_t   x, y, xw, yw;
       UInt_t  max_height;
       ULong_t hints;
       TGDimension csize, max_osize(0,0), msize = fMain->GetSize();

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          csize = ptr->fFrame->GetDefaultSize();
          max_osize.fWidth  = TMath::Max(max_osize.fWidth, csize.fWidth);
          max_osize.fHeight = TMath::Max(max_osize.fHeight, csize.fHeight);
       }

       max_height = TMath::Max(msize.fHeight, max_osize.fHeight + (fSep << 1));

       x = fSep; y = fSep << 1;

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {

          hints = ptr->fLayout->GetLayoutHints();
          csize = ptr->fFrame->GetDefaultSize();

          if (hints & kLHintsCenterX)
             xw = x + (Int_t)((max_osize.fWidth - csize.fWidth) >> 1);
          else if (hints & kLHintsRight)
             xw = x + (Int_t)max_osize.fWidth - (Int_t)csize.fWidth;
          else // defaults to kLHintsLeft
             xw = x;

          if (hints & kLHintsCenterY)
             yw = y + (Int_t)((max_osize.fHeight - csize.fHeight) >> 1);
          else if (hints & kLHintsBottom)
             yw = y + (Int_t)max_osize.fHeight - (Int_t)csize.fHeight;
          else // defaults to kLHintsTop
             yw = y;

          ptr->fFrame->Move(xw, yw);
          y += (Int_t)max_osize.fHeight + fSep + (fSep >> 1);

          if (y + max_osize.fHeight > max_height) {
             y = fSep << 1;
             x += (Int_t)max_osize.fWidth + fSep;
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGListLayout::GetDefaultSize() const
    {
       // Return default dimension of the list layout.

       TGFrameElement *ptr;
       Int_t x, y;
       TGDimension max_size, max_osize(0,0), msize = fMain->GetSize();

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          max_size = ptr->fFrame->GetDefaultSize();
          max_osize.fWidth  = TMath::Max(max_osize.fWidth, max_size.fWidth);
          max_osize.fHeight = TMath::Max(max_osize.fHeight, max_size.fHeight);
       }

       max_size.fHeight = TMath::Max(msize.fHeight, max_osize.fHeight + (fSep << 1));

       x = fSep; y = fSep << 1;

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          y += (Int_t)max_osize.fHeight + fSep + (fSep >> 1);
          if (y + max_osize.fHeight > max_size.fHeight) {
             y = fSep << 1;
             x += (Int_t)max_osize.fWidth + fSep;
          }
       }
       if (y != (fSep << 1)) x += (Int_t)max_osize.fWidth + fSep;
       max_size.fWidth = TMath::Max(x, (Int_t)msize.fWidth);

       return max_size;
    }

    //______________________________________________________________________________
    void TGListDetailsLayout::Layout()
    {
       // Make a list details layout of all frames in the list.

       TGFrameElement *ptr;
       TGDimension     csize, msize = fMain->GetSize();
       Int_t max_oh = 0, x = fSep, y = fSep << 1;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          csize = ptr->fFrame->GetDefaultSize();
          max_oh = TMath::Max(max_oh, (Int_t)csize.fHeight);
       }

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             csize = ptr->fFrame->GetDefaultSize();
             ptr->fFrame->MoveResize(x, y, msize.fWidth, csize.fHeight);
             ptr->fFrame->Layout();
             y += max_oh + fSep + (fSep >> 1);
          }
       }
    }

    //______________________________________________________________________________
    TGDimension TGListDetailsLayout::GetDefaultSize() const
    {
       // Return default dimension of the list details layout.

       TGFrameElement *ptr;
       TGDimension csize, max_osize(0,0);
       Int_t y = fSep << 1;

       TIter next(fList);
       while ((ptr = (TGFrameElement *) next())) {
          csize = ptr->fFrame->GetDefaultSize();
          max_osize.fWidth  = TMath::Max(max_osize.fWidth, csize.fWidth);
          max_osize.fHeight = TMath::Max(max_osize.fHeight, csize.fHeight);
       }

       next.Reset();
       while ((ptr = (TGFrameElement *) next())) {
          if (ptr->fState & kIsVisible) {
             y += max_osize.fHeight + fSep + (fSep >> 1);
          }
       }

       return TGDimension( fWidth ? fWidth : max_osize.fWidth, y);
    }

    // ________________________________________________________________________
    void TGLayoutHints::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save layout hints as a C++ statement(s) on output stream out

       TString hints;
       UInt_t pad = GetPadLeft()+GetPadRight()+GetPadTop()+GetPadBottom();

       if (!GetLayoutHints()) return;

       if ((fLayoutHints == kLHintsNormal) && (pad == 0)) return;

       if (fLayoutHints & kLHintsLeft) {
          if (hints.Length() == 0) hints  = "kLHintsLeft";
    			   else                     hints += " | kLHintsLeft";
       }
       if (fLayoutHints & kLHintsCenterX) {
          if  (hints.Length() == 0) hints  = "kLHintsCenterX";
          else                     hints += " | kLHintsCenterX";
       }
       if (fLayoutHints & kLHintsRight) {
          if (hints.Length() == 0) hints  = "kLHintsRight";
          else                     hints += " | kLHintsRight";
       }
       if (fLayoutHints & kLHintsTop) {
          if (hints.Length() == 0) hints  = "kLHintsTop";
          else                     hints += " | kLHintsTop";
       }
       if (fLayoutHints & kLHintsCenterY) {
          if (hints.Length() == 0) hints  = "kLHintsCenterY";
    	     else                     hints += " | kLHintsCenterY";
       }
       if (fLayoutHints & kLHintsBottom) {
          if (hints.Length() == 0) hints  = "kLHintsBottom";
          else                     hints += " | kLHintsBottom";
       }
       if (fLayoutHints & kLHintsExpandX) {
          if (hints.Length() == 0) hints  = "kLHintsExpandX";
          else                     hints += " | kLHintsExpandX";
       }
       if (fLayoutHints & kLHintsExpandY) {
          if (hints.Length() == 0) hints  = "kLHintsExpandY";
          else                     hints += " | kLHintsExpandY";
       }

       out << ", new TGLayoutHints(" << hints;

       if (pad) {
          out << "," << GetPadLeft() << "," << GetPadRight()
              << "," << GetPadTop()  << "," << GetPadBottom();
        }
        out<< ")";
    }

    // __________________________________________________________________________
    void TGVerticalLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save vertical layout manager as a C++ statement(s) on output stream

       out << " new TGVerticalLayout(" << fMain->GetName() << ")";

    }

    // __________________________________________________________________________
    void TGHorizontalLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save horizontal layout manager as a C++ statement(s) on output stream

       out << " new TGHorizontalLayout(" << fMain->GetName() << ")";
    }

    // __________________________________________________________________________
    void TGRowLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save row layout manager as a C++ statement(s) on output stream

       out << " new TGRowLayout(" << fMain->GetName() << ","
                                 << fSep << ")";
    }

    // __________________________________________________________________________
    void TGColumnLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save column layout manager as a C++ statement(s) on output stream

       out << " new TGColumnLayout(" << fMain->GetName() << ","
                                    << fSep << ")";

    }

    // __________________________________________________________________________
    void TGMatrixLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save matrix layout manager as a C++ statement(s) on output stream

       out << " new TGMatrixLayout(" << fMain->GetName() << ","
                                    << fRows << ","
                                    << fColumns << ","
                                    << fSep << ","
                                    << fHints <<")";

    }

    // __________________________________________________________________________
     void TGTileLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save tile layout manager as a C++ statement(s) on output stream

       out << " new TGTileLayout(" << fMain->GetName() << ","
                                  << fSep << ")";

    }

    // __________________________________________________________________________
    void TGListLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save list layout manager as a C++ statement(s) on output stream

       out << " new TGListLayout(" << fMain->GetName() << ","
                                  << fSep << ")";

    }

    // __________________________________________________________________________
    void TGListDetailsLayout::SavePrimitive(ofstream &out, Option_t *)
    {

       // Save list details layout manager as a C++ statement(s) on out stream

       out << " new TGListDetailsLayout(" << fMain->GetName() << ","
                                         << fSep << "," << fWidth << ")";

    }