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 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_RADIOBOX
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/radiobox.h"
  31 #endif //WX_PRECOMP
  32
  33 // ============================================================================
  34 // implementation
  35 // ============================================================================
  36
  37 int wxRadioBoxBase::GetNextItem(int item, wxDirection dir, long style) const
  38 {
  39     int count = GetCount(),
  40         numCols = GetColumnCount(),
  41         numRows = GetRowCount();
  42
  43     bool horz = (style & wxRA_SPECIFY_COLS) != 0;
  44
  45     switch ( dir )
  46     {
  47         case wxUP:
  48             if ( horz )
  49             {
  50                 item -= numCols;
  51             }
  52             else // vertical layout
  53             {
  54                 if ( !item-- )
  55                     item = count - 1;
  56             }
  57             break;
  58
  59         case wxLEFT:
  60             if ( horz )
  61             {
  62                 if ( !item-- )
  63                     item = count - 1;
  64             }
  65             else // vertical layout
  66             {
  67                 item -= numRows;
  68             }
  69             break;
  70
  71         case wxDOWN:
  72             if ( horz )
  73             {
  74                 item += numCols;
  75             }
  76             else // vertical layout
  77             {
  78                 if ( ++item == count )
  79                     item = 0;
  80             }
  81             break;
  82
  83         case wxRIGHT:
  84             if ( horz )
  85             {
  86                 if ( ++item == count )
  87                     item = 0;
  88             }
  89             else // vertical layout
  90             {
  91                 item += numRows;
  92             }
  93             break;
  94
  95         default:
  96             wxFAIL_MSG( _T("unexpected wxDirection value") );
  97             return wxNOT_FOUND;
  98     }
  99
 100     // ensure that the item is in range [0..count)
 101     if ( item < 0 )
 102     {
 103         // first map the item to the one in the same column but in the last row
 104         item += count;
 105
 106         // now there are 2 cases: either it is the first item of the last row
 107         // in which case we need to wrap again and get to the last item or we
 108         // can just go to the previous item
 109         if ( item % (horz ? numCols : numRows) )
 110             item--;
 111         else
 112             item = count - 1;
 113     }
 114     else if ( item >= count )
 115     {
 116         // same logic as above
 117         item -= count;
 118
 119         // ... except that we need to check if this is not the last item, not
 120         // the first one
 121         if ( (item + 1) % (horz ? numCols : numRows) )
 122             item++;
 123         else
 124             item = 0;
 125     }
 126
 127     wxASSERT_MSG( item < count && item >= 0,
 128                   _T("logic error in wxRadioBox::GetNextItem()") );
 129
 130     return item;
 131 }
 132
 133 #if WXWIN_COMPATIBILITY_2_4
 134
 135 // these functions are deprecated and don't do anything
 136 int wxRadioBoxBase::GetNumberOfRowsOrCols() const
 137 {
 138     return 1;
 139 }
 140
 141 void wxRadioBoxBase::SetNumberOfRowsOrCols(int WXUNUSED(n))
 142 {
 143 }
 144
 145 #endif // WXWIN_COMPATIBILITY_2_4
 146
 147 #endif // wxUSE_RADIOBOX