wxPython/src/_core_api.i

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        _core_api.i
   3 // Purpose:
   4 //
   5 // Author:      Robin Dunn
   6 //
   7 // Created:     13-Sept-2003
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) 2003 by Total Control Software
  10 // Licence:     wxWindows license
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 // Not a %module
  14
  15
  16 //---------------------------------------------------------------------------
  17 %{
  18 #ifndef wxPyUSE_EXPORT
  19 // Helper functions for dealing with SWIG objects and such.  These are
  20 // located here so they know about the SWIG types and functions declared
  21 // in the wrapper code.
  22
  23 #include <wx/hashmap.h>
  24     WX_DECLARE_STRING_HASH_MAP( swig_type_info*, wxPyTypeInfoHashMap );
  25
  26
  27 // Maintains a hashmap of className to swig_type_info pointers.  Given the
  28 // name of a class either looks up the type info in the cache, or scans the
  29 // SWIG tables for it.
  30 extern PyObject* wxPyPtrTypeMap;
  31 static
  32 swig_type_info* wxPyFindSwigType(const wxChar* className) {
  33
  34     static wxPyTypeInfoHashMap* typeInfoCache = NULL;
  35
  36     if (typeInfoCache == NULL)
  37         typeInfoCache = new wxPyTypeInfoHashMap;
  38
  39     wxString name(className);
  40     swig_type_info* swigType = (*typeInfoCache)[name];
  41
  42     if (! swigType) {
  43         // it wasn't in the cache, so look it up from SWIG
  44         name.Append(wxT(" *"));
  45         swigType = SWIG_TypeQuery(name.mb_str());
  46
  47         // if it still wasn't found, try looking for a mapped name
  48         if (!swigType) {
  49             PyObject* item;
  50             name = className;
  51
  52             if ((item = PyDict_GetItemString(wxPyPtrTypeMap,
  53                                (char*)(const char*)name.mbc_str())) != NULL) {
  54                 name = wxString(PyString_AsString(item), *wxConvCurrent);
  55                 name.Append(wxT(" *"));
  56                 swigType = SWIG_TypeQuery(name.mb_str());
  57             }
  58         }
  59         if (swigType) {
  60             // and add it to the map if found
  61             (*typeInfoCache)[className] = swigType;
  62         }
  63     }
  64     return swigType;
  65 }
  66
  67
  68 // Check if a class name is a type known to SWIG
  69 bool wxPyCheckSwigType(const wxChar* className) {
  70
  71     swig_type_info* swigType = wxPyFindSwigType(className);
  72     return swigType != NULL;
  73 }
  74
  75
  76 // Given a pointer to a C++ object and a class name, construct a Python proxy
  77 // object for it.
  78 PyObject* wxPyConstructObject(void* ptr,
  79                               const wxChar* className,
  80                               int setThisOwn) {
  81
  82     swig_type_info* swigType = wxPyFindSwigType(className);
  83     wxCHECK_MSG(swigType != NULL, NULL, wxT("Unknown type in wxPyConstructObject"));
  84
  85     return SWIG_Python_NewPointerObj(ptr, swigType, setThisOwn);
  86 }
  87
  88
  89 // Extract a pointer to the wrapped C++ object from a Python proxy object.
  90 // Ensures that the proxy object is of the specified (or derived) type.  If
  91 // not able to perform the conversion then a Python exception is set and the
  92 // error should be handled properly in the caller.  Returns True on success.
  93 bool wxPyConvertSwigPtr(PyObject* obj, void **ptr,
  94                         const wxChar* className) {
  95
  96     swig_type_info* swigType = wxPyFindSwigType(className);
  97     wxCHECK_MSG(swigType != NULL, false, wxT("Unknown type in wxPyConvertSwigPtr"));
  98
  99     return SWIG_Python_ConvertPtr(obj, ptr, swigType, SWIG_POINTER_EXCEPTION) != -1;
 100 }
 101
 102
 103 // Make a SWIGified pointer object suitable for a .this attribute
 104 PyObject* wxPyMakeSwigPtr(void* ptr, const wxChar* className) {
 105
 106     PyObject* robj = NULL;
 107
 108     swig_type_info* swigType = wxPyFindSwigType(className);
 109     wxCHECK_MSG(swigType != NULL, NULL, wxT("Unknown type in wxPyConvertSwigPtr"));
 110
 111 #ifdef SWIG_COBJECT_TYPES
 112     robj = PySwigObject_FromVoidPtrAndDesc((void *) ptr, (char *)swigType->name);
 113 #else
 114     {
 115         char result[1024];
 116         robj = SWIG_PackVoidPtr(result, ptr, swigType->name, sizeof(result)) ?
 117             PyString_FromString(result) : 0;
 118     }
 119 #endif
 120
 121     return robj;
 122 }
 123
 124
 125 // Python's PyInstance_Check does not return True for instances of new-style
 126 // classes.  This should get close enough for both new and old classes but I
 127 // should re-evaluate the need for doing instance checks...
 128 bool wxPyInstance_Check(PyObject* obj) {
 129     return PyObject_HasAttrString(obj, "__class__") != 0;
 130 }
 131
 132
 133
 134 // This one checks if the object is an instance of a SWIG proxy class (it has
 135 // a .this attribute, and the .this attribute is a PySwigObject.)
 136 bool wxPySwigInstance_Check(PyObject* obj) {
 137     static PyObject* this_str = NULL;
 138     if (this_str == NULL)
 139         this_str = PyString_FromString("this");
 140
 141     PyObject* this_attr = PyObject_GetAttr(obj, this_str);
 142     if (this_attr) {
 143         bool retval = (PySwigObject_Check(this_attr) != 0);
 144         Py_DECREF(this_attr);
 145         return retval;
 146     }
 147
 148     PyErr_Clear();
 149     return false;
 150 }
 151
 152
 153
 154 // Export a C API in a struct.  Other modules will be able to load this from
 155 // the wx._core_ module and will then have safe access to these functions,
 156 // even if they are located in another shared library.
 157 static wxPyCoreAPI API = {
 158
 159     wxPyCheckSwigType,
 160     wxPyConstructObject,
 161     wxPyConvertSwigPtr,
 162     wxPyMakeSwigPtr,
 163
 164     wxPyBeginAllowThreads,
 165     wxPyEndAllowThreads,
 166     wxPyBeginBlockThreads,
 167     wxPyEndBlockThreads,
 168
 169     wxPy_ConvertList,
 170
 171     wxString_in_helper,
 172     Py2wxString,
 173     wx2PyString,
 174
 175     byte_LIST_helper,
 176     int_LIST_helper,
 177     long_LIST_helper,
 178     string_LIST_helper,
 179     wxPoint_LIST_helper,
 180     wxBitmap_LIST_helper,
 181     wxString_LIST_helper,
 182     wxAcceleratorEntry_LIST_helper,
 183
 184     wxSize_helper,
 185     wxPoint_helper,
 186     wxRealPoint_helper,
 187     wxRect_helper,
 188     wxColour_helper,
 189     wxPoint2D_helper,
 190
 191     wxPySimple_typecheck,
 192     wxColour_typecheck,
 193
 194     wxPyCBH_setCallbackInfo,
 195     wxPyCBH_findCallback,
 196     wxPyCBH_callCallback,
 197     wxPyCBH_callCallbackObj,
 198     wxPyCBH_delete,
 199
 200     wxPyMake_wxObject,
 201     wxPyMake_wxSizer,
 202     wxPyPtrTypeMap_Add,
 203     wxPy2int_seq_helper,
 204     wxPy4int_seq_helper,
 205     wxArrayString2PyList_helper,
 206     wxArrayInt2PyList_helper,
 207
 208     wxPyClientData_dtor,
 209     wxPyUserData_dtor,
 210     wxPyOORClientData_dtor,
 211
 212     wxPyCBInputStream_create,
 213     wxPyCBInputStream_copy,
 214
 215     wxPyInstance_Check,
 216     wxPySwigInstance_Check,
 217
 218     wxPyCheckForApp
 219
 220 };
 221
 222 #endif
 223 %}
 224
 225
 226
 227
 228 %init %{
 229 #ifndef wxPyUSE_EXPORT
 230     // Make our API structure a CObject so other modules can import it
 231     // from this module.
 232     PyObject* cobj = PyCObject_FromVoidPtr(&API, NULL);
 233     PyDict_SetItemString(d,"_wxPyCoreAPI", cobj);
 234     Py_XDECREF(cobj);
 235 #endif
 236 %}
 237
 238 //---------------------------------------------------------------------------