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Diffstat (limited to 'libs/glibmm2/glibmm/object.cc')
| -rw-r--r-- | libs/glibmm2/glibmm/object.cc | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/libs/glibmm2/glibmm/object.cc b/libs/glibmm2/glibmm/object.cc new file mode 100644 index 0000000000..007002b779 --- /dev/null +++ b/libs/glibmm2/glibmm/object.cc @@ -0,0 +1,312 @@ +// -*- c++ -*- +/* $Id$ */ + +/* Copyright 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 <glibmm/object.h> +#include <glibmm/private/object_p.h> +#include <glibmm/property.h> + +#include <glib.h> +#include <glib-object.h> +#include <gobject/gvaluecollector.h> + +#include <cstdarg> + +#include <cstring> + +//Weak references: +//I'm not sure what the point of these are apart from being a hacky way out of circular references, +//but maybe we could make it easier to use them by making a Java Reference Object -style class like so: +// Glib::WeakRef<SomeDerivedObject> weakrefSomeObject(object1); +// ... +// if(weakrefSomeObject->isStillAlive()) +// { +// weakrefSomeObject->some_method(); +// } +// else +// { +// //Deal with it, maybe recreating the object. +// } +// +// Without this, the coder has to define his own signal handler which sets his own isStillAlive boolean. +// weakrefSomeObject<> could still have its own signal_destroyed signal so that coders can choose to deal +// with the destruction as soon as it happens instead of just checking later before they try to use it. + + +namespace Glib +{ + +ConstructParams::ConstructParams(const Glib::Class& glibmm_class_) +: + glibmm_class (glibmm_class_), + n_parameters (0), + parameters (0) +{} + +/* The implementation is mostly copied from gobject.c, with some minor tweaks. + * Basically, it looks up each property name to get its GType, and then uses + * G_VALUE_COLLECT() to store the varargs argument in a GValue of the correct + * type. + */ +ConstructParams::ConstructParams(const Glib::Class& glibmm_class_, + const char* first_property_name, ...) +: + glibmm_class (glibmm_class_), + n_parameters (0), + parameters (0) +{ + va_list var_args; + va_start(var_args, first_property_name); + + GObjectClass *const g_class = + static_cast<GObjectClass*>(g_type_class_ref(glibmm_class.get_type())); + + unsigned int n_alloced_params = 0; + char* collect_error = 0; // output argument of G_VALUE_COLLECT() + + for(const char* name = first_property_name; + name != 0; + name = va_arg(var_args, char*)) + { + GParamSpec *const pspec = g_object_class_find_property(g_class, name); + + if(!pspec) + { + g_warning("Glib::ConstructParams::ConstructParams(): " + "object class `%s' has no property named `%s'", + g_type_name(glibmm_class.get_type()), name); + break; + } + + if(n_parameters >= n_alloced_params) + parameters = g_renew(GParameter, parameters, n_alloced_params += 8); + + GParameter& param = parameters[n_parameters]; + + param.name = name; + param.value.g_type = 0; + + // Fill the GValue with the current vararg, and move on to the next one. + g_value_init(¶m.value, G_PARAM_SPEC_VALUE_TYPE(pspec)); + G_VALUE_COLLECT(¶m.value, var_args, 0, &collect_error); + + if(collect_error) + { + g_warning("Glib::ConstructParams::ConstructParams(): %s", collect_error); + g_free(collect_error); + g_value_unset(¶m.value); + break; + } + + ++n_parameters; + } + + g_type_class_unref(g_class); + + va_end(var_args); +} + +ConstructParams::~ConstructParams() +{ + while(n_parameters > 0) + g_value_unset(¶meters[--n_parameters].value); + + g_free(parameters); +} + +/* + * Some compilers require the existance of a copy constructor in certain + * usage contexts. This implementation is fully functional, but unlikely + * to be ever actually called due to optimization. + */ +ConstructParams::ConstructParams(const ConstructParams& other) +: + glibmm_class (other.glibmm_class), + n_parameters (other.n_parameters), + parameters (g_new(GParameter, n_parameters)) +{ + for(unsigned int i = 0; i < n_parameters; ++i) + { + parameters[i].name = other.parameters[i].name; + parameters[i].value.g_type = 0; + + g_value_init(¶meters[i].value, G_VALUE_TYPE(&other.parameters[i].value)); + g_value_copy(&other.parameters[i].value, ¶meters[i].value); + } +} + + +/**** Glib::Object_Class ***************************************************/ + +const Glib::Class& Object_Class::init() +{ + if(!gtype_) + { + class_init_func_ = &Object_Class::class_init_function; + register_derived_type(G_TYPE_OBJECT); + } + + return *this; +} + +void Object_Class::class_init_function(void*, void*) +{} + +Object* Object_Class::wrap_new(GObject* object) +{ + return new Object(object); +} + + +/**** Glib::Object *********************************************************/ + +// static data +Object::CppClassType Object::object_class_; + +Object::Object() +{ + // This constructor is ONLY for derived classes that are NOT wrappers of + // derived C objects. For instance, Gtk::Object should NOT use this + // constructor. + + //g_warning("Object::Object(): Did you really mean to call this?"); + + // If Glib::ObjectBase has been constructed with a custom typeid, we derive + // a new GType on the fly. This works because ObjectBase is a virtual base + // class, therefore its constructor is always executed first. + + GType object_type = G_TYPE_OBJECT; // the default -- not very useful + + if(custom_type_name_ && !is_anonymous_custom_()) + { + object_class_.init(); + object_type = object_class_.clone_custom_type(custom_type_name_); //A type that is derived from GObject. + } + + // Create a new GObject with the specified array of construct properties. + // This works with custom types too, since those inherit the properties of + // their base class. + + void *const new_object = g_object_newv(object_type, 0, 0); + + // Connect the GObject and Glib::Object instances. + ObjectBase::initialize(static_cast<GObject*>(new_object)); + +} + +Object::Object(const Glib::ConstructParams& construct_params) +{ + GType object_type = construct_params.glibmm_class.get_type(); + + // If Glib::ObjectBase has been constructed with a custom typeid, we derive + // a new GType on the fly. This works because ObjectBase is a virtual base + // class, therefore its constructor is always executed first. + + if(custom_type_name_ && !is_anonymous_custom_()) + object_type = construct_params.glibmm_class.clone_custom_type(custom_type_name_); + + // Create a new GObject with the specified array of construct properties. + // This works with custom types too, since those inherit the properties of + // their base class. + + void *const new_object = g_object_newv( + object_type, construct_params.n_parameters, construct_params.parameters); + + // Connect the GObject and Glib::Object instances. + ObjectBase::initialize(static_cast<GObject*>(new_object)); +} + +Object::Object(GObject* castitem) +{ + //I disabled this check because libglademm really does need to do this. + //(actually it tells libglade to instantiate "gtkmm_" types. + //The 2nd instance bug will be caught elsewhere anyway. +/* + static const char gtkmm_prefix[] = "gtkmm__"; + const char *const type_name = G_OBJECT_TYPE_NAME(castitem); + + if(strncmp(type_name, gtkmm_prefix, sizeof(gtkmm_prefix) - 1) == 0) + { + g_warning("Glib::Object::Object(GObject*): " + "An object of type '%s' was created directly via g_object_new(). " + "The Object::Object(const Glib::ConstructParams&) constructor " + "should be used instead.\n" + "This could happen if the C instance lived longer than the C++ instance, so that " + "a second C++ instance was created automatically to wrap it. That would be a gtkmm bug that you should report.", + type_name); + } +*/ + + // Connect the GObject and Glib::Object instances. + ObjectBase::initialize(castitem); +} + +Object::~Object() +{ + cpp_destruction_in_progress_ = true; +} + +/* +RefPtr<Object> Object::create() +{ + // Derived classes will actually return RefPtr<>s that contain useful instances. + return RefPtr<Object>(); +} +*/ + +GType Object::get_type() +{ + return object_class_.init().get_type(); +} + +GType Object::get_base_type() +{ + return G_TYPE_OBJECT; +} + +// Data services +void* Object::get_data(const QueryQuark& id) +{ + return g_object_get_qdata(gobj(),id); +} + +void Object::set_data(const Quark& id, void* data) +{ + g_object_set_qdata(gobj(),id,data); +} + +void Object::set_data(const Quark& id, void* data, DestroyNotify destroy) +{ + g_object_set_qdata_full(gobj(), id, data, destroy); +} + +void Object::remove_data(const QueryQuark& id) +{ + // missing in glib?? + g_return_if_fail(id.id() > 0); + g_datalist_id_remove_data(&gobj()->qdata, id); +} + +void* Object::steal_data(const QueryQuark& id) +{ + return g_object_steal_qdata(gobj(), id); +} + +} // namespace Glib + |