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/* Copyright (C) 2014 The glibmm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
using Flags = Glib::Binding::Flags;
#include <glibmm/binding.h>
#include <glib.h>
namespace
{
struct BindingTransformSlots
{
BindingTransformSlots(const Glib::Binding::SlotTransform& transform_to,
const Glib::Binding::SlotTransform& transform_from)
: from_source_to_target(transform_to), from_target_to_source(transform_from)
{
}
Glib::Binding::SlotTransform from_source_to_target;
Glib::Binding::SlotTransform from_target_to_source;
};
gboolean
Binding_transform_callback_common(
const GValue* from_value, GValue* to_value, Glib::Binding::SlotTransform& the_slot)
{
bool result = false;
try
{
result = the_slot(from_value, to_value);
}
catch (...)
{
Glib::exception_handlers_invoke();
}
return result;
}
extern "C"
{
static gboolean
Binding_transform_to_callback(
GBinding*, const GValue* from_value, GValue* to_value, gpointer user_data)
{
Glib::Binding::SlotTransform& the_slot =
static_cast<BindingTransformSlots*>(user_data)->from_source_to_target;
return Binding_transform_callback_common(from_value, to_value, the_slot);
}
static gboolean
Binding_transform_from_callback(
GBinding*, const GValue* from_value, GValue* to_value, gpointer user_data)
{
Glib::Binding::SlotTransform& the_slot =
static_cast<BindingTransformSlots*>(user_data)->from_target_to_source;
return Binding_transform_callback_common(from_value, to_value, the_slot);
}
static void
Binding_transform_callback_destroy(gpointer user_data)
{
delete static_cast<BindingTransformSlots*>(user_data);
}
} // extern "C"
} // anonymous namespace
namespace Glib
{
// static
Glib::RefPtr<Binding>
Binding::bind_property_value(const PropertyProxy_Base& source_property,
const PropertyProxy_Base& target_property, Flags flags, const SlotTransform& transform_to,
const SlotTransform& transform_from)
{
GBinding* binding = nullptr;
if (transform_to.empty() && transform_from.empty())
{
// No user-supplied transformations.
binding =
g_object_bind_property(source_property.get_object()->gobj(), source_property.get_name(),
target_property.get_object()->gobj(), target_property.get_name(), (GBindingFlags)flags);
}
else
{
// Create copies of the slots. A pointer to this will be passed
// through the callback's data parameter. It will be deleted
// when Binding_transform_callback_destroy() is called.
BindingTransformSlots* slots_copy = new BindingTransformSlots(transform_to, transform_from);
binding = g_object_bind_property_full(source_property.get_object()->gobj(),
source_property.get_name(), target_property.get_object()->gobj(), target_property.get_name(),
(GBindingFlags)flags, transform_to.empty() ? nullptr : &Binding_transform_to_callback,
transform_from.empty() ? nullptr : &Binding_transform_from_callback, slots_copy,
&Binding_transform_callback_destroy);
}
if (!binding)
return Glib::RefPtr<Binding>();
// Take an extra ref. GBinding uses one ref itself, and drops it if
// either the source object or the target object is finalized.
// The GBinding object must not be destroyed while there are RefPtrs around.
g_object_ref(binding);
return Glib::make_refptr_for_instance<Binding>(new Binding(binding));
}
void
Binding::unbind()
{
// Call g_binding_unbind() only once. It always calls g_object_unref().
GObject* source = g_binding_dup_source(gobj());
if (source)
{
g_binding_unbind(gobj());
g_object_unref(source);
}
}
} // namespace Glib
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