src/common/radiocmn.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/radiocmn.cpp
   3 // Purpose:     wxRadioBox methods common to all ports
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     03.06.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // License:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "radioboxbase.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_RADIOBOX
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/radiobox.h"
  35 #endif //WX_PRECOMP
  36
  37 // ============================================================================
  38 // implementation
  39 // ============================================================================
  40
  41 int wxRadioBoxBase::GetNextItem(int item, wxDirection dir, long style) const
  42 {
  43     int count = GetCount(),
  44         numCols = GetColumnCount(),
  45         numRows = GetRowCount();
  46
  47     bool horz = (style & wxRA_SPECIFY_COLS) != 0;
  48
  49     switch ( dir )
  50     {
  51         case wxUP:
  52             if ( horz )
  53             {
  54                 item -= numCols;
  55             }
  56             else // vertical layout
  57             {
  58                 if ( !item-- )
  59                     item = count - 1;
  60             }
  61             break;
  62
  63         case wxLEFT:
  64             if ( horz )
  65             {
  66                 if ( !item-- )
  67                     item = count - 1;
  68             }
  69             else // vertical layout
  70             {
  71                 item -= numRows;
  72             }
  73             break;
  74
  75         case wxDOWN:
  76             if ( horz )
  77             {
  78                 item += numCols;
  79             }
  80             else // vertical layout
  81             {
  82                 if ( ++item == count )
  83                     item = 0;
  84             }
  85             break;
  86
  87         case wxRIGHT:
  88             if ( horz )
  89             {
  90                 if ( ++item == count )
  91                     item = 0;
  92             }
  93             else // vertical layout
  94             {
  95                 item += numRows;
  96             }
  97             break;
  98
  99         default:
 100             wxFAIL_MSG( _T("unexpected wxDirection value") );
 101             return -1;
 102     }
 103
 104     // ensure that the item is in range [0..count)
 105     if ( item < 0 )
 106     {
 107         // first map the item to the one in the same column but in the last row
 108         item += count;
 109
 110         // now there are 2 cases: either it is the first item of the last row
 111         // in which case we need to wrap again and get to the last item or we
 112         // can just go to the previous item
 113         if ( item % (horz ? numCols : numRows) )
 114             item--;
 115         else
 116             item = count - 1;
 117     }
 118     else if ( item >= count )
 119     {
 120         // same logic as above
 121         item -= count;
 122
 123         // ... except that we need to check if this is not the last item, not
 124         // the first one
 125         if ( (item + 1) % (horz ? numCols : numRows) )
 126             item++;
 127         else
 128             item = 0;
 129     }
 130
 131     wxASSERT_MSG( item < count && item >= 0,
 132                   _T("logic error in wxRadioBox::GetNextItem()") );
 133
 134     return item;
 135 }
 136
 137 #endif // wxUSE_RADIOBOX
 138