src/common/object.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        object.cpp
   3 // Purpose:     wxObject implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "object.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/hash.h"
  25     #if wxUSE_SERIAL
  26         #include "wx/objstrm.h"
  27         #include "wx/serbase.h"
  28
  29         // for error messages
  30         #include "wx/log.h"
  31         #include "wx/intl.h"
  32     #endif // wxUSE_SERIAL
  33 #endif // WX_PRECOMP
  34
  35 #include <string.h>
  36 #include <assert.h>
  37
  38 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  39 #include "wx/memory.h"
  40 #endif
  41
  42 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
  43     // for wxObject::Dump
  44     #include "wx/ioswrap.h"
  45 #endif
  46
  47 #if !USE_SHARED_LIBRARY
  48 wxClassInfo wxObject::sm_classwxObject((wxChar *) wxT("wxObject"), (wxChar *) NULL, (wxChar *) NULL, (int ) sizeof(wxObject), (wxObjectConstructorFn) NULL);
  49 wxClassInfo* wxClassInfo::sm_first = (wxClassInfo *) NULL;
  50 wxHashTable* wxClassInfo::sm_classTable = (wxHashTable*) NULL;
  51 #endif
  52
  53 /*
  54  * wxWindows root object.
  55  */
  56
  57 wxObject::wxObject()
  58 {
  59     m_refData = (wxObjectRefData *) NULL;
  60 #if wxUSE_SERIAL
  61     m_serialObj = (wxObject_Serialize *)NULL;
  62 #endif
  63 }
  64
  65 wxObject::~wxObject()
  66 {
  67     UnRef();
  68 #if wxUSE_SERIAL
  69     if (m_serialObj)
  70         delete m_serialObj;
  71 #endif
  72 }
  73
  74 /*
  75  * Is this object a kind of (a subclass of) 'info'?
  76  * E.g. is wxWindow a kind of wxObject?
  77  * Go from this class to superclass, taking into account
  78  * two possible base classes.
  79  */
  80
  81 bool wxObject::IsKindOf(wxClassInfo *info) const
  82 {
  83     wxClassInfo *thisInfo = GetClassInfo();
  84     if (thisInfo)
  85         return thisInfo->IsKindOf(info);
  86     else
  87         return FALSE;
  88 }
  89
  90 wxObject *wxObject::Clone() const
  91 {
  92     wxObject *object = GetClassInfo()->CreateObject();
  93     CopyObject(*object);
  94     return object;
  95 }
  96
  97 #ifdef __WXDEBUG__
  98 void wxObject::CopyObject(wxObject& object_dest) const
  99 #else // !Debug
 100 void wxObject::CopyObject(wxObject& WXUNUSED(object_dest)) const
 101 #endif // Debug/!Debug
 102 {
 103     wxASSERT(object_dest.GetClassInfo()->IsKindOf(GetClassInfo()));
 104 }
 105
 106 #if wxUSE_STD_IOSTREAM && (defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT)
 107 void wxObject::Dump(ostream& str)
 108 {
 109     if (GetClassInfo() && GetClassInfo()->GetClassName())
 110         str << GetClassInfo()->GetClassName();
 111     else
 112         str << "unknown object class";
 113 }
 114 #endif
 115
 116 #if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING
 117
 118 #ifdef new
 119 #undef new
 120 #endif
 121
 122 void *wxObject::operator new (size_t size, wxChar * fileName, int lineNum)
 123 {
 124     return wxDebugAlloc(size, fileName, lineNum, TRUE);
 125 }
 126
 127 void wxObject::operator delete (void * buf)
 128 {
 129     wxDebugFree(buf);
 130 }
 131
 132 // VC++ 6.0
 133 #if defined(__VISUALC__) && (__VISUALC__ >= 1200)
 134 void wxObject::operator delete(void* pData, char* /* fileName */, int /* lineNum */)
 135 {
 136     ::operator delete(pData);
 137 }
 138 #endif
 139
 140 // Cause problems for VC++ - crashes
 141 #if (!defined(__VISUALC__) && wxUSE_ARRAY_MEMORY_OPERATORS ) || defined(__MWERKS__)
 142 void * wxObject::operator new[] (size_t size, wxChar * fileName, int lineNum)
 143 {
 144     return wxDebugAlloc(size, fileName, lineNum, TRUE, TRUE);
 145 }
 146
 147 void wxObject::operator delete[] (void * buf)
 148 {
 149     wxDebugFree(buf, TRUE);
 150 }
 151 #endif
 152
 153 #endif
 154
 155 /*
 156  * Class info: provides run-time class type information.
 157  */
 158
 159 wxClassInfo::wxClassInfo(wxChar *cName, wxChar *baseName1, wxChar *baseName2, int sz, wxObjectConstructorFn constr)
 160 {
 161     m_className = cName;
 162     m_baseClassName1 = baseName1;
 163     m_baseClassName2 = baseName2;
 164
 165     m_objectSize = sz;
 166     m_objectConstructor = constr;
 167
 168     m_next = sm_first;
 169     sm_first = this;
 170
 171     m_baseInfo1 = (wxClassInfo *) NULL;
 172     m_baseInfo2 = (wxClassInfo *) NULL;
 173 }
 174
 175 wxObject *wxClassInfo::CreateObject()
 176 {
 177     if (m_objectConstructor)
 178         return (wxObject *)(*m_objectConstructor)();
 179     else
 180         return (wxObject *) NULL;
 181 }
 182
 183 wxClassInfo *wxClassInfo::FindClass(wxChar *c)
 184 {
 185     wxClassInfo *p = sm_first;
 186     while (p)
 187     {
 188         if (p && p->GetClassName() && wxStrcmp(p->GetClassName(), c) == 0)
 189             return p;
 190         p = p->m_next;
 191     }
 192     return (wxClassInfo *) NULL;
 193 }
 194
 195 // Climb upwards through inheritance hierarchy.
 196 // Dual inheritance is catered for.
 197 bool wxClassInfo::IsKindOf(wxClassInfo *info) const
 198 {
 199     if (info == NULL)
 200         return FALSE;
 201
 202     // For some reason, when making/using a DLL, static data has to be included
 203     // in both the DLL and the application. This can lead to duplicate
 204     // wxClassInfo objects, so we have to test the name instead of the pointers.
 205     // PROBABLY NO LONGER TRUE now I've done DLL creation right.
 206     /*
 207 #if WXMAKINGDLL
 208 if (GetClassName() && info->GetClassName() && (wxStrcmp(GetClassName(), info->GetClassName()) == 0))
 209 return TRUE;
 210 #else
 211      */
 212     if (this == info)
 213         return TRUE;
 214
 215     if (m_baseInfo1)
 216         if (m_baseInfo1->IsKindOf(info))
 217             return TRUE;
 218
 219     if (m_baseInfo2)
 220         return m_baseInfo2->IsKindOf(info);
 221
 222     return FALSE;
 223 }
 224
 225 // Set pointers to base class(es) to speed up IsKindOf
 226 void wxClassInfo::InitializeClasses()
 227 {
 228     wxClassInfo::sm_classTable = new wxHashTable(wxKEY_STRING);
 229
 230     // Index all class infos by their class name
 231     wxClassInfo *info = sm_first;
 232     while (info)
 233     {
 234         if (info->m_className)
 235             sm_classTable->Put(info->m_className, (wxObject *)info);
 236         info = info->m_next;
 237     }
 238
 239     // Set base pointers for each wxClassInfo
 240     info = sm_first;
 241     while (info)
 242     {
 243         if (info->GetBaseClassName1())
 244             info->m_baseInfo1 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName1());
 245         if (info->GetBaseClassName2())
 246             info->m_baseInfo2 = (wxClassInfo *)sm_classTable->Get(info->GetBaseClassName2());
 247         info = info->m_next;
 248     }
 249 }
 250
 251 void wxClassInfo::CleanUpClasses()
 252 {
 253     delete wxClassInfo::sm_classTable;
 254     wxClassInfo::sm_classTable = NULL;
 255 }
 256
 257 wxObject *wxCreateDynamicObject(const wxChar *name)
 258 {
 259     if (wxClassInfo::sm_classTable)
 260     {
 261         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
 262         if (!info)
 263             return (wxObject *)NULL;
 264
 265         return info->CreateObject();
 266     }
 267     else
 268     {
 269         wxClassInfo *info = wxClassInfo::sm_first;
 270         while (info)
 271         {
 272             if (info->m_className && wxStrcmp(info->m_className, name) == 0)
 273                 return info->CreateObject();
 274             info = info->m_next;
 275         }
 276         return (wxObject*) NULL;
 277     }
 278     return (wxObject*) NULL;
 279 }
 280
 281 #if wxUSE_SERIAL
 282
 283 #include "wx/serbase.h"
 284 #include "wx/dynlib.h"
 285 #include "wx/msgdlg.h"
 286
 287 wxObject* wxCreateStoredObject( wxInputStream &stream )
 288 {
 289     wxObjectInputStream obj_s(stream);
 290     return obj_s.LoadObject();
 291 };
 292
 293 void wxObject::StoreObject( wxObjectOutputStream& stream )
 294 {
 295     wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
 296     wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
 297
 298     if (!lib) {
 299         wxLogError(_("Can't load wxSerial dynamic library."));
 300         return;
 301     }
 302     if (!m_serialObj) {
 303         m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
 304
 305         if (!m_serialObj) {
 306             wxLogError(_("Can't find the serialization object '%s' "
 307                         "for the object '%s'."),
 308                     obj_name.c_str(),
 309                     GetClassInfo()->GetClassName());
 310             return;
 311         }
 312         m_serialObj->SetObject(this);
 313     }
 314
 315     m_serialObj->StoreObject(stream);
 316 }
 317
 318 void wxObject::LoadObject( wxObjectInputStream& stream )
 319 {
 320     wxString obj_name = wxString(GetClassInfo()->GetClassName()) + "_Serialize";
 321     wxLibrary *lib = wxTheLibraries.LoadLibrary("wxserial");
 322
 323     if (!m_serialObj) {
 324         m_serialObj = (WXSERIAL(wxObject) *)lib->CreateObject( obj_name );
 325
 326         if (!m_serialObj) {
 327             wxLogError(_("Can't find the serialization object '%s' "
 328                         "for the object '%s'."),
 329                     obj_name.c_str(),
 330                     GetClassInfo()->GetClassName());
 331             return;
 332         }
 333         m_serialObj->SetObject(this);
 334     }
 335
 336     m_serialObj->LoadObject(stream);
 337 }
 338
 339 #endif // wxUSE_SERIAL
 340
 341 /*
 342  * wxObject: cloning of objects
 343  */
 344
 345 void wxObject::Ref(const wxObject& clone)
 346 {
 347     // delete reference to old data
 348     UnRef();
 349     // reference new data
 350     if (clone.m_refData) {
 351         m_refData = clone.m_refData;
 352         ++(m_refData->m_count);
 353     }
 354 }
 355
 356 void wxObject::UnRef()
 357 {
 358     if (m_refData) {
 359         assert(m_refData->m_count > 0);
 360         --(m_refData->m_count);
 361         if (m_refData->m_count == 0)
 362             delete m_refData;
 363     }
 364     m_refData = (wxObjectRefData *) NULL;
 365 }
 366
 367 /*
 368  * wxObjectData
 369  */
 370
 371 wxObjectRefData::wxObjectRefData(void) : m_count(1)
 372 {
 373 }
 374
 375 wxObjectRefData::~wxObjectRefData()
 376 {
 377 }
 378
 379 // These are here so we can avoid 'always true/false' warnings
 380 // by referring to these instead of TRUE/FALSE
 381 const bool wxTrue = TRUE;
 382 const bool wxFalse = FALSE;