162 lines
4.4 KiB
C++
162 lines
4.4 KiB
C++
// -*- c++ -*-
|
|
/* $Id$ */
|
|
|
|
/* wrap.cc
|
|
*
|
|
* Copyright (C) 1998-2002 The gtkmm Development Team
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the Free
|
|
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <glib-object.h>
|
|
#include <glib/gtypes.h>
|
|
#include <glib/gmacros.h>
|
|
|
|
#include <vector>
|
|
#include <glibmm/object.h>
|
|
#include <glibmm/quark.h>
|
|
#include <glibmm/wrap.h>
|
|
|
|
#include <glibmmconfig.h>
|
|
GLIBMM_USING_STD(vector)
|
|
|
|
|
|
namespace
|
|
{
|
|
|
|
// Although the new g_type_set_qdata() interface is used now, we still need
|
|
// a table because we cannot assume that a function pointer fits into void*
|
|
// on any platform. Nevertheless, indexing a vector costs almost nothing
|
|
// compared to a map lookup.
|
|
|
|
typedef std::vector<Glib::WrapNewFunction> WrapFuncTable;
|
|
|
|
static WrapFuncTable* wrap_func_table = 0;
|
|
|
|
|
|
static Glib::ObjectBase* create_new_wrapper(GObject* object)
|
|
{
|
|
g_return_val_if_fail(wrap_func_table != 0, 0);
|
|
|
|
bool gtkmm_wrapper_already_deleted = (bool)g_object_get_qdata((GObject*)object, Glib::quark_cpp_wrapper_deleted_);
|
|
if(gtkmm_wrapper_already_deleted)
|
|
{
|
|
g_warning("Glib::create_new_wrapper: Attempted to create a 2nd C++ wrapper for a C instance whose C++ wrapper has been deleted.");
|
|
return 0;
|
|
}
|
|
|
|
// Traverse upwards through the inheritance hierarchy
|
|
// to find the most-specialized wrap_new() for this GType.
|
|
//
|
|
for(GType type = G_OBJECT_TYPE(object); type != 0; type = g_type_parent(type))
|
|
{
|
|
// Look up the wrap table index stored in the type's static data.
|
|
// If a wrap_new() has been registered for the type then call it.
|
|
//
|
|
if(const gpointer idx = g_type_get_qdata(type, Glib::quark_))
|
|
{
|
|
const Glib::WrapNewFunction func = (*wrap_func_table)[GPOINTER_TO_UINT(idx)];
|
|
return (*func)(object);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
|
|
namespace Glib
|
|
{
|
|
|
|
void wrap_register_init()
|
|
{
|
|
g_type_init();
|
|
|
|
if(!Glib::quark_)
|
|
{
|
|
Glib::quark_ = g_quark_from_static_string("glibmm__Glib::quark_");
|
|
Glib::quark_cpp_wrapper_deleted_ = g_quark_from_static_string("glibmm__Glib::quark_cpp_wrapper_deleted_");
|
|
}
|
|
|
|
if(!wrap_func_table)
|
|
{
|
|
// Make the first element a dummy so we can detect unregistered types.
|
|
// g_type_get_qdata() returns NULL if no data has been set up.
|
|
wrap_func_table = new WrapFuncTable(1);
|
|
}
|
|
}
|
|
|
|
void wrap_register_cleanup()
|
|
{
|
|
if(wrap_func_table)
|
|
{
|
|
delete wrap_func_table;
|
|
wrap_func_table = 0;
|
|
}
|
|
}
|
|
|
|
// Register the unique wrap_new() function of a new C++ wrapper type.
|
|
// The GType argument specifies the parent C type to wrap from.
|
|
//
|
|
void wrap_register(GType type, WrapNewFunction func)
|
|
{
|
|
const guint idx = wrap_func_table->size();
|
|
wrap_func_table->push_back(func);
|
|
|
|
// Store the table index in the type's static data.
|
|
g_type_set_qdata(type, Glib::quark_, GUINT_TO_POINTER(idx));
|
|
}
|
|
|
|
// This is a factory function that converts any type to
|
|
// its C++ wrapper instance by looking up a wrap_new() function in a map.
|
|
//
|
|
ObjectBase* wrap_auto(GObject* object, bool take_copy)
|
|
{
|
|
if(!object)
|
|
return 0;
|
|
|
|
// Look up current C++ wrapper instance:
|
|
ObjectBase* pCppObject =
|
|
static_cast<ObjectBase*>(g_object_get_qdata(object, Glib::quark_));
|
|
|
|
if(!pCppObject)
|
|
{
|
|
// There's not already a wrapper: generate a new C++ instance.
|
|
pCppObject = create_new_wrapper(object);
|
|
|
|
if(!pCppObject)
|
|
{
|
|
g_warning("failed to wrap type of '%s'", G_OBJECT_TYPE_NAME(object));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// take_copy=true is used where the GTK+ function doesn't do
|
|
// an extra ref for us, and always for plain struct members.
|
|
if(take_copy)
|
|
pCppObject->reference();
|
|
|
|
return pCppObject;
|
|
}
|
|
|
|
Glib::RefPtr<Object> wrap(GObject* object, bool take_copy /* = false */)
|
|
{
|
|
return Glib::RefPtr<Object>(dynamic_cast<Object*>(wrap_auto(object, take_copy)));
|
|
}
|
|
|
|
} /* namespace Glib */
|
|
|