src/common/object.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/object.cpp
   3 // Purpose:     wxObject implementation
   4 // Author:      Julian Smart
   5 // Modified by: Ron Lee
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Julian Smart
   9 //              (c) 2001 Ron Lee <ron@debian.org>
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  14 #pragma implementation "object.h"
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25     #include "wx/hash.h"
  26     #include "wx/object.h"
  27 #endif
  28
  29 #include <string.h>
  30
  31 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  32 #include "wx/memory.h"
  33 #endif
  34
  35 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
  36     #if defined(__VISAGECPP__)
  37         #define DEBUG_PRINTF(NAME) { static int raz=0; \
  38             printf( #NAME " %i\n",raz); fflush(stdout); raz++; }
  39     #else
  40         #define DEBUG_PRINTF(NAME)
  41     #endif
  42 #endif // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT
  43
  44 // we must disable optimizations for VC.NET because otherwise its too eager
  45 // linker discards wxClassInfo objects in release build thus breaking many,
  46 // many things
  47 #if defined __VISUALC__ && __VISUALC__ >= 1300
  48     #pragma optimize("", off)
  49 #endif
  50
  51 #if wxUSE_EXTENDED_RTTI
  52 const wxClassInfo* wxObject::sm_classParentswxObject[] = { NULL } ;
  53  wxObject* wxVariantToObjectConverterwxObject ( wxxVariant &data )
  54 { return data.Get<wxObject*>() ; }
  55  wxObject* wxVariantOfPtrToObjectConverterwxObject ( wxxVariant &data )
  56 { return &data.Get<wxObject>() ; }
  57  wxxVariant wxObjectToVariantConverterwxObject ( wxObject *data )
  58  { return wxxVariant( dynamic_cast<wxObject*> (data)  ) ; }
  59  wxClassInfo wxObject::sm_classwxObject(sm_classParentswxObject , wxT("") , wxT("wxObject"),
  60             (int) sizeof(wxObject),                              \
  61             (wxObjectConstructorFn) 0   ,
  62                         (wxPropertyInfo*) NULL,(wxHandlerInfo*) NULL,0 , 0 ,
  63                         0 , wxVariantOfPtrToObjectConverterwxObject , wxVariantToObjectConverterwxObject , wxObjectToVariantConverterwxObject);
  64  template<> void wxStringReadValue(const wxString & , wxObject * & ){assert(0) ;}
  65  template<> void wxStringWriteValue(wxString & , wxObject* const & ){assert(0) ;}
  66  template<> void wxStringReadValue(const wxString & , wxObject & ){assert(0) ;}
  67  template<> void wxStringWriteValue(wxString & , wxObject const & ){assert(0) ;}
  68  wxClassTypeInfo s_typeInfo(wxT_OBJECT_PTR , &wxObject::sm_classwxObject , NULL , NULL , typeid(wxObject*).name() ) ;
  69  wxClassTypeInfo s_typeInfowxObject(wxT_OBJECT , &wxObject::sm_classwxObject , NULL , NULL , typeid(wxObject).name() ) ;
  70 #else
  71 wxClassInfo wxObject::sm_classwxObject( wxT("wxObject"), 0, 0,
  72                                         (int) sizeof(wxObject),
  73                                         (wxObjectConstructorFn) 0 );
  74 #endif
  75
  76 // restore optimizations
  77 #if defined __VISUALC__ && __VISUALC__ >= 1300
  78     #pragma optimize("", on)
  79 #endif
  80
  81 wxClassInfo* wxClassInfo::sm_first = NULL;
  82 wxHashTable* wxClassInfo::sm_classTable = NULL;
  83
  84 // These are here so we can avoid 'always true/false' warnings
  85 // by referring to these instead of TRUE/FALSE
  86 const bool wxTrue = TRUE;
  87 const bool wxFalse = FALSE;
  88
  89 // Is this object a kind of (a subclass of) 'info'?
  90 // E.g. is wxWindow a kind of wxObject?
  91 // Go from this class to superclass, taking into account
  92 // two possible base classes.
  93 bool wxObject::IsKindOf(wxClassInfo *info) const
  94 {
  95     wxClassInfo *thisInfo = GetClassInfo();
  96     return (thisInfo) ? thisInfo->IsKindOf(info) : FALSE ;
  97 }
  98
  99 #if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new )
 100         #undef new
 101 #endif
 102
 103
 104 #ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
 105 void *wxObject::operator new ( size_t size, const wxChar *fileName, int lineNum )
 106 {
 107     return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE);
 108 }
 109 #endif
 110
 111 #ifdef _WX_WANT_DELETE_VOID
 112 void wxObject::operator delete ( void *buf )
 113 {
 114     wxDebugFree(buf);
 115 }
 116 #endif
 117
 118 #ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
 119 void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )
 120 {
 121     wxDebugFree(buf);
 122 }
 123 #endif
 124
 125 #ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
 126 void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )
 127 {
 128      wxDebugFree(buf);
 129 }
 130 #endif
 131
 132 #ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
 133 void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )
 134 {
 135     return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE, TRUE);
 136 }
 137 #endif
 138
 139 #ifdef _WX_WANT_ARRAY_DELETE_VOID
 140 void wxObject::operator delete[] ( void *buf )
 141 {
 142     wxDebugFree(buf, TRUE);
 143 }
 144 #endif
 145
 146 #ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
 147 void wxObject::operator delete[] (void * buf, const wxChar*  WXUNUSED(fileName), int WXUNUSED(lineNum) )
 148 {
 149     wxDebugFree(buf, TRUE);
 150 }
 151 #endif
 152
 153
 154 // ----------------------------------------------------------------------------
 155 // wxClassInfo
 156 // ----------------------------------------------------------------------------
 157
 158 wxClassInfo::~wxClassInfo()
 159 {
 160     // remove this object from the linked list of all class infos: if we don't
 161     // do it, loading/unloading a DLL containing static wxClassInfo objects is
 162     // not going to work
 163     if ( this == sm_first )
 164     {
 165         sm_first = m_next;
 166     }
 167     else
 168     {
 169         wxClassInfo *info = sm_first;
 170         while (info)
 171         {
 172             if ( info->m_next == this )
 173             {
 174                 info->m_next = m_next;
 175                 break;
 176             }
 177
 178             info = info->m_next;
 179         }
 180     }
 181         Unregister();
 182 }
 183
 184 wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
 185 {
 186     if ( sm_classTable )
 187     {
 188         return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
 189     }
 190     else
 191     {
 192         for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
 193         {
 194             if ( wxStrcmp(info->GetClassName(), className) == 0 )
 195                 return info;
 196         }
 197
 198         return NULL;
 199     }
 200 }
 201
 202 void wxClassInfo::CleanUp()
 203 {
 204     if ( sm_classTable )
 205     {
 206         delete sm_classTable;
 207         sm_classTable = NULL;
 208     }
 209 }
 210
 211 void wxClassInfo::Register()
 212 {
 213     if ( !sm_classTable )
 214     {
 215         sm_classTable = new wxHashTable(wxKEY_STRING);
 216     }
 217
 218     // using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
 219     // link any object module twice mistakenly) will break this function
 220     // because it will enter an infinite loop and eventually die with "out of
 221     // memory" - as this is quite hard to detect if you're unaware of this,
 222     // try to do some checks here
 223     wxASSERT_MSG( sm_classTable->Get(m_className) == NULL,
 224                   _T("class already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
 225
 226     sm_classTable->Put(m_className, (wxObject *)this);
 227 }
 228
 229 void wxClassInfo::Unregister()
 230 {
 231     if ( sm_classTable )
 232     {
 233         sm_classTable->Delete(m_className);
 234         if ( sm_classTable->GetCount() == 0 )
 235         {
 236             delete sm_classTable;
 237             sm_classTable = NULL;
 238         }
 239     }
 240 }
 241
 242 wxObject *wxCreateDynamicObject(const wxChar *name)
 243 {
 244 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 245     DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
 246 #endif
 247
 248     if ( wxClassInfo::sm_classTable )
 249     {
 250         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
 251         return info ? info->CreateObject() : NULL;
 252     }
 253     else // no sm_classTable yet
 254     {
 255         for ( wxClassInfo *info = wxClassInfo::sm_first;
 256               info;
 257               info = info->m_next )
 258         {
 259             if (info->m_className && wxStrcmp(info->m_className, name) == 0)
 260                 return info->CreateObject();
 261         }
 262
 263         return NULL;
 264     }
 265 }
 266
 267
 268 // ----------------------------------------------------------------------------
 269 // wxObject
 270 // ----------------------------------------------------------------------------
 271
 272 // Initialize ref data from another object (needed for copy constructor and
 273 // assignment operator)
 274 void wxObject::InitFrom(const wxObject& other)
 275 {
 276     m_refData = other.m_refData;
 277     if ( m_refData )
 278         m_refData->m_count++;
 279 }
 280
 281 void wxObject::Ref(const wxObject& clone)
 282 {
 283 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 284     DEBUG_PRINTF(wxObject::Ref)
 285 #endif
 286
 287     // nothing to be done
 288     if (m_refData == clone.m_refData)
 289         return;
 290
 291     // delete reference to old data
 292     UnRef();
 293
 294     // reference new data
 295     if ( clone.m_refData )
 296     {
 297         m_refData = clone.m_refData;
 298         ++(m_refData->m_count);
 299     }
 300 }
 301
 302 void wxObject::UnRef()
 303 {
 304     if ( m_refData )
 305     {
 306         wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
 307
 308         if ( !--m_refData->m_count )
 309             delete m_refData;
 310         m_refData = NULL;
 311     }
 312 }
 313
 314 void wxObject::AllocExclusive()
 315 {
 316     if ( !m_refData )
 317     {
 318         m_refData = CreateRefData();
 319     }
 320     else if ( m_refData->GetRefCount() > 1 )
 321     {
 322         // note that ref is not going to be destroyed in this case
 323         const wxObjectRefData* ref = m_refData;
 324         UnRef();
 325
 326         // ... so we can still access it
 327         m_refData = CloneRefData(ref);
 328     }
 329     //else: ref count is 1, we are exclusive owners of m_refData anyhow
 330
 331     wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1,
 332                   _T("wxObject::AllocExclusive() failed.") );
 333 }
 334
 335 wxObjectRefData *wxObject::CreateRefData() const
 336 {
 337     // if you use AllocExclusive() you must override this method
 338     wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") );
 339
 340     return NULL;
 341 }
 342
 343 wxObjectRefData *
 344 wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const
 345 {
 346     // if you use AllocExclusive() you must override this method
 347     wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") );
 348
 349     return NULL;
 350 }