//+------------------------------------------------------------------+
//|                                                         Grid.mqh |
//|                                                   Enrico Lambino |
//|                                      www.mql5.com/en/users/iceron|
//+------------------------------------------------------------------+
#property copyright "Enrico Lambino"
#property link      "https://www.mql5.com/en/articles/1998"
#property strict
#include "Box.mqh"
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CGrid : public CBox
  {
protected:
   int               m_cols;
   int               m_rows;
   int               m_hgap;
   int               m_vgap;
   CSize             m_cell_size;
public:
                     CGrid();
                     CGrid(int rows,int cols,int hgap=0,int vgap=0);
                    ~CGrid();
   virtual int       Type() const {return CLASS_LAYOUT;}
   virtual bool      Init(int rows,int cols,int hgap=0,int vgap=0);
   virtual bool      Create(const long chart,const string name,const int subwin,
                            const int x1,const int y1,const int x2,const int y2);
   virtual int       Columns(){return(m_cols);}
   virtual void      Columns(int cols){m_cols=cols;}
   virtual int       Rows(){return(m_rows);}
   virtual void      Rows(int rows){m_rows=rows;}
   virtual int       HGap(){return(m_hgap);}
   virtual void      HGap(int gap){m_hgap=gap;}
   virtual int       VGap(){return(m_vgap);}
   virtual void      VGap(int gap){m_vgap=gap;}
   virtual bool      Pack();
protected:
   virtual void      CheckControlSize(CWnd *control);
  };
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
CGrid::CGrid()
  {
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
CGrid::CGrid(int rows,int cols,int hgap=0,int vgap=0)
  {
   Init(rows,cols,hgap,vgap);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
CGrid::~CGrid()
  {
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
bool CGrid::Init(int rows,int cols,int hgap=0,int vgap=0)
  {
   Columns(cols);
   Rows(rows);
   HGap(hgap);
   VGap(vgap);
   return(true);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
bool CGrid::Create(const long chart,const string name,const int subwin,
                   const int x1,const int y1,const int x2,const int y2)
  {
   return(CBox::Create(chart,name,subwin,x1,y1,x2,y2));
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
bool CGrid::Pack()
  {
   CSize size=Size();
   m_cell_size.cx = (size.cx-((m_cols+1)*m_hgap))/m_cols;
   m_cell_size.cy = (size.cy-((m_rows+1)*m_vgap))/m_rows;
   int x=Left(),y=Top();
   int cnt=0;
   for(int i=0;i<ControlsTotal();i++)
     {
      CWnd *control=Control(i);
      if(control==NULL)
         continue;
      if(control==GetPointer(m_background))
         continue;
      if(cnt==0 || Right()-(x+m_cell_size.cx)<m_cell_size.cx+m_hgap)
        {
         if(cnt==0)
            y+=m_vgap;            
         else y+=m_vgap+m_cell_size.cy;
         x=Left()+m_hgap;
        }
      else x+=m_cell_size.cx+m_hgap;    
      CheckControlSize(control);
      control.Move(x,y);
      if(control.Type()==CLASS_LAYOUT)
        {
         CBox *container=control;
         container.Pack();
        }
      cnt++;
     }   
   return(true);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void CGrid::CheckControlSize(CWnd *control)
  {
   control.Size(m_cell_size.cx,m_cell_size.cy);
  }
//+------------------------------------------------------------------+