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#ifndef _GLIBMM_PROPERTYPROXY_H
#define _GLIBMM_PROPERTYPROXY_H
/* propertyproxy.h
*
* Copyright 2002 The gtkmm 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/>.
*/
#include <glibmmconfig.h>
#include <glibmm/propertyproxy_base.h>
namespace Glib
{
/** A PropertyProxy can be used to get and set the value of an object's property.
* There are usually also get and set methods on the class itself, which you might find more
* convenient.
* With the PropertyProxy, you may use either get_value() and set_value(), or operator=() and
* operator PropertyType(), like so:
* @code
* int height = cellrenderer.property_height();
* cellrenderer.property_editable() = true;
* @endcode
*
* You may also receive notification when a property's value changes, by connecting to
* signal_changed().
*/
template <class T>
class PropertyProxy : public PropertyProxy_Base
{
public:
using PropertyType = T;
PropertyProxy(ObjectBase* obj, const char* name) : PropertyProxy_Base(obj, name) {}
/** Set the value of this property.
* @param data The new value for the property.
*/
void set_value(const PropertyType& data);
/** Get the value of this property.
* @result The current value of the property.
*/
PropertyType get_value() const;
/** Set the value of this property back to its default value
*/
void reset_value() { reset_property_(); }
PropertyProxy<T>& operator=(const PropertyType& data)
{
this->set_value(data);
return *this;
}
operator PropertyType() const { return this->get_value(); }
};
/** See PropertyProxy().
* This property can be written, but not read, so there is no get_value() method.
*/
template <class T>
class PropertyProxy_WriteOnly : public PropertyProxy_Base
{
public:
using PropertyType = T;
PropertyProxy_WriteOnly(ObjectBase* obj, const char* name) : PropertyProxy_Base(obj, name) {}
/** Set the value of this property.
* @param data The new value for the property.
*/
void set_value(const PropertyType& data);
/** Set the value of this property back to its default value
*/
void reset_value() { reset_property_(); }
PropertyProxy_WriteOnly<T>& operator=(const PropertyType& data)
{
this->set_value(data);
return *this;
}
};
/** See PropertyProxy().
* This property can be read, but not written, so there is no set_value() method.
*/
template <class T>
class PropertyProxy_ReadOnly : public PropertyProxy_Base
{
public:
using PropertyType = T;
// obj is const, because this should be returned by const accessors.
PropertyProxy_ReadOnly(const ObjectBase* obj, const char* name)
: PropertyProxy_Base(const_cast<ObjectBase*>(obj), name)
{
}
/** Get the value of this property.
* @result The current value of the property.
*/
PropertyType get_value() const;
operator PropertyType() const { return this->get_value(); }
};
/**** Template Implementation **********************************************/
#ifndef DOXYGEN_SHOULD_SKIP_THIS
template <class T>
void
PropertyProxy<T>::set_value(const T& data)
{
Glib::Value<T> value;
value.init(Glib::Value<T>::value_type());
value.set(data);
set_property_(value);
}
template <class T>
T
PropertyProxy<T>::get_value() const
{
Glib::Value<T> value;
value.init(Glib::Value<T>::value_type());
get_property_(value);
return value.get();
}
// We previously just static_cast<> PropertyProxy_WriteOnly<> to PropertyProxy<> to call its
// set_value(),
// to avoid code duplication.
// But the AIX compiler does not like that hack.
template <class T>
void
PropertyProxy_WriteOnly<T>::set_value(const T& data)
{
Glib::Value<T> value;
value.init(Glib::Value<T>::value_type());
value.set(data);
set_property_(value);
}
// We previously just static_cast<> PropertyProxy_WriteOnly<> to PropertyProxy<> to call its
// set_value(),
// to avoid code duplication.
// But the AIX compiler does not like that hack.
template <class T>
T
PropertyProxy_ReadOnly<T>::get_value() const
{
Glib::Value<T> value;
value.init(Glib::Value<T>::value_type());
get_property_(value);
return value.get();
}
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
} // namespace Glib
#endif /* _GLIBMM_PROPERTYPROXY_H */
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