// @(#)root/gui:$Name:  $:$Id: TGTableLayout.h,v 1.2 2001/05/02 14:18:27 rdm Exp $
// Author: Brett Viren   04/15/2001

/*************************************************************************
 * Copyright (C) 2001, Brett Viren                                       *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TGTableLayout
#define ROOT_TGTableLayout

#ifndef ROOT_TGLayout
#include "TGLayout.h"
#endif


// extension of ELayoutHints
enum ETableLayoutHints {
   kLHintsShrinkX = BIT(8),
   kLHintsShrinkY = BIT(9),
   kLHintsFillX   = BIT(10),
   kLHintsFillY   = BIT(11)
};


//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TGTableLayoutHints                                                   //
//                                                                      //
// This class describes layout hints used by the TGTableLayout class.   //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

class TGTableLayoutHints : public TGLayoutHints {

protected:
   UInt_t fAttachLeft;         // Column/row division number on which
   UInt_t fAttachRight;        // to attach the frame.  Starts at 0
   UInt_t fAttachTop;          // and goes to # columns / # rows
   UInt_t fAttachBottom;       // respectively

public:
   TGTableLayoutHints(UInt_t attach_left, UInt_t attach_right,
                      UInt_t attach_top, UInt_t attach_bottom,
                      ULong_t hints = kLHintsNormal,
                      UInt_t padleft = 0, UInt_t padright = 0,
                      UInt_t padtop = 0, UInt_t padbottom = 0)
      : TGLayoutHints(hints,padleft,padright,padtop,padbottom),
         fAttachLeft(attach_left),
         fAttachRight(attach_right),
         fAttachTop(attach_top),
         fAttachBottom(attach_bottom) { }
   virtual ~TGTableLayoutHints() { }

   UInt_t GetAttachLeft() const { return fAttachLeft; }
   UInt_t GetAttachRight() const { return fAttachRight; }
   UInt_t GetAttachTop() const { return fAttachTop; }
   UInt_t GetAttachBottom() const { return fAttachBottom; }

   ClassDef(TGTableLayoutHints,0)  // Class describing GUI table layout hints
};


//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TGTableLayout                                                        //
//                                                                      //
// A LayoutManager which places child frames in a table. This uses      //
// TGTableLayoutHints (not TGLayoutHints). See TGTableLayoutHints       //
// for how to use these. This manager works like TGMatrixLayout with    //
// the addition that:                                                   //
//  - Child frames can span more than one column/row.                   //
//  - Child frames can resize with the frame.                           //
//  - Column and row sizes are not fixed nor (optionally) homogeneous.  //
//  - The number of columns and rows must be fully specified.           //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

class TGTableLayout : public TGLayoutManager {

protected:
   struct TableData {
      UInt_t fDefSize;        // Default size of col/rows
      UInt_t fRealSize;       // Real size of col/rows (eg, if table resize)
      Bool_t fNeedExpand;
      Bool_t fNeedShrink;
      Bool_t fExpand;
      Bool_t fShrink;
      Bool_t fEmpty;
   };
   TableData        *fRow;          // info about each row
   TableData        *fCol;          // info about each column
   TGCompositeFrame *fMain;         // container frame
   TList            *fList;         // list of frames to arrange
   Bool_t            fHomogeneous;  // all cols/rows same size

   void FindRowColSizes();
   void FindRowColSizesInit();
   void FindRowColSizesHomogeneous();
   void FindRowColSizesSinglyAttached();
   void FindRowColSizesMultiplyAttached();

   void SetRowColSizes();
   void SetRowColSizesInit();

   void CheckSanity();

   static void SetRowColResize(UInt_t real_size, UInt_t nthings,
                               TableData *thing, Bool_t homogeneous);

public:
   // these are public in TGMatrixLayout ???  Perpetuate it.
   Int_t   fSep;               // interval between frames
   Int_t   fHints;             // layout hints (currently not used)
   UInt_t  fNrows;             // number of rows
   UInt_t  fNcols;             // number of columns

   TGTableLayout(TGCompositeFrame *main, UInt_t nrows, UInt_t ncols,
                 Bool_t homogeneous = kFALSE, Int_t sep = 0, Int_t hints = 0);
   virtual ~TGTableLayout();

   virtual void Layout();
   virtual TGDimension GetDefaultSize() const; // return sum of all child sizes

   ClassDef(TGTableLayout,0)  // Table layout manager
};

#endif