include/wx/windowid.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/windowid.h
   3 // Purpose:     wxWindowID class - a class for managing window ids
   4 // Author:      Brian Vanderburg II
   5 // Created:     2007-09-21
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 Brian Vanderburg II
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_WINDOWID_H_
  12 #define _WX_WINDOWID_H_
  13
  14 // NB: do not include defs.h as we are included from it
  15
  16 typedef int wxWindowID;
  17
  18 // ----------------------------------------------------------------------------
  19 // wxWindowIDRef: reference counted id value
  20 // ----------------------------------------------------------------------------
  21
  22 // A wxWindowIDRef object wraps an id value and marks it as (un)used as
  23 // necessary. All ids returned from wxWindow::NewControlId() should be assigned
  24 // to an instance of this class to ensure that the id is marked as being in
  25 // use.
  26 //
  27 // This class is always defined but it is trivial if wxUSE_AUTOID_MANAGEMENT is
  28 // off.
  29 class WXDLLIMPEXP_CORE wxWindowIDRef
  30 {
  31 public:
  32     // default ctor
  33     wxWindowIDRef()
  34     {
  35         m_id = wxID_NONE;
  36     }
  37
  38     // ctor taking id values
  39     wxWindowIDRef(int id)
  40     {
  41         Init(id);
  42     }
  43
  44     wxWindowIDRef(long id)
  45     {
  46         Init(id);
  47     }
  48
  49     wxWindowIDRef(const wxWindowIDRef& id)
  50     {
  51         Init(id.m_id);
  52     }
  53
  54     // dtor
  55     ~wxWindowIDRef()
  56     {
  57         Assign(wxID_NONE);
  58     }
  59
  60     // assignment
  61     wxWindowIDRef& operator=(int id)
  62     {
  63         Assign(id);
  64         return *this;
  65     }
  66
  67     wxWindowIDRef& operator=(long id)
  68     {
  69         Assign(id);
  70         return *this;
  71     }
  72
  73     wxWindowIDRef& operator=(const wxWindowIDRef& id)
  74     {
  75         if (&id != this)
  76             Assign(id.m_id);
  77         return *this;
  78     }
  79
  80     // access to the stored id value
  81     wxWindowID GetValue() const
  82     {
  83         return m_id;
  84     }
  85
  86     operator wxWindowID() const
  87     {
  88         return m_id;
  89     }
  90
  91 private:
  92 #if wxUSE_AUTOID_MANAGEMENT
  93     // common part of all ctors: call Assign() for our new id
  94     void Init(wxWindowID id)
  95     {
  96         // m_id must be initialized before calling Assign()
  97         m_id = wxID_NONE;
  98         Assign(id);
  99     }
 100
 101     // increase reference count of id, decrease the one of m_id
 102     void Assign(wxWindowID id);
 103 #else // !wxUSE_AUTOID_MANAGEMENT
 104     // trivial stubs for the functions above
 105     void Init(wxWindowID id)
 106     {
 107         m_id = id;
 108     }
 109
 110     void Assign(wxWindowID id)
 111     {
 112         m_id = id;
 113     }
 114 #endif // wxUSE_AUTOID_MANAGEMENT/!wxUSE_AUTOID_MANAGEMENT
 115
 116
 117     wxWindowID m_id;
 118 };
 119
 120 // comparison operators
 121 inline bool operator==(const wxWindowIDRef& lhs, const wxWindowIDRef& rhs)
 122 {
 123     return lhs.GetValue() == rhs.GetValue();
 124 }
 125
 126 inline bool operator==(const wxWindowIDRef& lhs, int rhs)
 127 {
 128     return lhs.GetValue() == rhs;
 129 }
 130
 131 inline bool operator==(const wxWindowIDRef& lhs, long rhs)
 132 {
 133     return lhs.GetValue() == rhs;
 134 }
 135
 136 inline bool operator==(int lhs, const wxWindowIDRef& rhs)
 137 {
 138     return rhs == lhs;
 139 }
 140
 141 inline bool operator==(long lhs, const wxWindowIDRef& rhs)
 142 {
 143     return rhs == lhs;
 144 }
 145
 146 inline bool operator!=(const wxWindowIDRef& lhs, const wxWindowIDRef& rhs)
 147 {
 148     return !(lhs == rhs);
 149 }
 150
 151 inline bool operator!=(const wxWindowIDRef& lhs, int rhs)
 152 {
 153     return !(lhs == rhs);
 154 }
 155
 156 inline bool operator!=(const wxWindowIDRef& lhs, long rhs)
 157 {
 158     return !(lhs == rhs);
 159 }
 160
 161 inline bool operator!=(int lhs, const wxWindowIDRef& rhs)
 162 {
 163     return !(lhs == rhs);
 164 }
 165
 166 inline bool operator!=(long lhs, const wxWindowIDRef& rhs)
 167 {
 168     return !(lhs == rhs);
 169 }
 170
 171 // ----------------------------------------------------------------------------
 172 // wxIdManager
 173 // ----------------------------------------------------------------------------
 174
 175 class WXDLLIMPEXP_CORE wxIdManager
 176 {
 177 public:
 178     // This returns an id value and not an wxWindowIDRef.  The returned value
 179     // should be assigned a.s.a.p to a wxWindowIDRef.  The IDs are marked as
 180     // reserved so that another call to ReserveId before assigning the id to a
 181     // wxWindowIDRef will not use the same ID
 182     static wxWindowID ReserveId(int count = 1);
 183
 184     // This will release an unused reserved ID.  This should only be called
 185     // if the ID returned by ReserveId was NOT assigned to a wxWindowIDRef
 186     // for some purpose, maybe an early return from a function
 187     static void UnreserveId(wxWindowID id, int count = 1);
 188 };
 189
 190 #endif // _WX_WINDOWID_H_