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#ifndef _GLIBMM_BINDING_H
#define _GLIBMM_BINDING_H
/* 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/>.
*/
#include <glibmm/object.h>
#include <glibmm/refptr.h>
#include <glibmm/ustring.h>
#include <glibmm/value.h>
#ifndef DOXYGEN_SHOULD_SKIP_THIS
using GBinding = struct _GBinding;
using GBindingClass = struct _GBindingClass;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{ class Binding_Class; } // namespace Glib
#endif //DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{
/** @addtogroup glibmmEnums glibmm Enums and Flags */
/**
* @var BindingFlags BINDING_DEFAULT
* The default binding; if the source property
* changes, the target property is updated with its value.
*
* @var BindingFlags BINDING_BIDIRECTIONAL
* Bidirectional binding; if either the
* property of the source or the property of the target changes,
* the other is updated.
*
* @var BindingFlags BINDING_SYNC_CREATE
* Synchronize the values of the source and
* target properties when creating the binding; the direction of
* the synchronization is always from the source to the target.
*
* @var BindingFlags BINDING_INVERT_BOOLEAN
* If the two properties being bound are
* booleans, setting one to <tt>true</tt> will result in the other being
* set to <tt>false</tt> and vice versa. This flag will only work for
* boolean properties, and cannot be used when passing custom
* transformation functions to g_object_bind_property_full().
*
* @enum BindingFlags
*
* Flags to be passed to g_object_bind_property() or
* g_object_bind_property_full().
*
* This enumeration can be extended at later date.
*
* @newin{2,44}
*
* @ingroup glibmmEnums
* @par Bitwise operators:
* <tt>%BindingFlags operator|(BindingFlags, BindingFlags)</tt><br>
* <tt>%BindingFlags operator&(BindingFlags, BindingFlags)</tt><br>
* <tt>%BindingFlags operator^(BindingFlags, BindingFlags)</tt><br>
* <tt>%BindingFlags operator~(BindingFlags)</tt><br>
* <tt>%BindingFlags& operator|=(BindingFlags&, BindingFlags)</tt><br>
* <tt>%BindingFlags& operator&=(BindingFlags&, BindingFlags)</tt><br>
* <tt>%BindingFlags& operator^=(BindingFlags&, BindingFlags)</tt><br>
*/
enum BindingFlags
{
BINDING_DEFAULT = 0x0,
BINDING_BIDIRECTIONAL = 1 << 0,
BINDING_SYNC_CREATE = 1 << 1,
BINDING_INVERT_BOOLEAN = 1 << 2
};
/** @ingroup glibmmEnums */
inline BindingFlags operator|(BindingFlags lhs, BindingFlags rhs)
{ return static_cast<BindingFlags>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs)); }
/** @ingroup glibmmEnums */
inline BindingFlags operator&(BindingFlags lhs, BindingFlags rhs)
{ return static_cast<BindingFlags>(static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs)); }
/** @ingroup glibmmEnums */
inline BindingFlags operator^(BindingFlags lhs, BindingFlags rhs)
{ return static_cast<BindingFlags>(static_cast<unsigned>(lhs) ^ static_cast<unsigned>(rhs)); }
/** @ingroup glibmmEnums */
inline BindingFlags operator~(BindingFlags flags)
{ return static_cast<BindingFlags>(~static_cast<unsigned>(flags)); }
/** @ingroup glibmmEnums */
inline BindingFlags& operator|=(BindingFlags& lhs, BindingFlags rhs)
{ return (lhs = static_cast<BindingFlags>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs))); }
/** @ingroup glibmmEnums */
inline BindingFlags& operator&=(BindingFlags& lhs, BindingFlags rhs)
{ return (lhs = static_cast<BindingFlags>(static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs))); }
/** @ingroup glibmmEnums */
inline BindingFlags& operator^=(BindingFlags& lhs, BindingFlags rhs)
{ return (lhs = static_cast<BindingFlags>(static_cast<unsigned>(lhs) ^ static_cast<unsigned>(rhs))); }
} // namespace Glib
#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{
template <>
class Value<Glib::BindingFlags> : public Glib::Value_Flags<Glib::BindingFlags>
{
public:
static GType value_type() G_GNUC_CONST;
};
} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
namespace Glib
{
/** Bind two object properties.
*
* Glib::Binding is the representation of a binding between a property on a
* Glib::ObjectBase instance (or source) and another property on another Glib::ObjectBase
* instance (or target). Whenever the source property changes, the same
* value is applied to the target property; for instance, the following binding:
*
* @code
* Glib::Binding::bind_property(object1->property_a(), object2->property_b());
* @endcode
*
* will cause property_b() of @a object2 to be updated
* every time the value of property_a() of @a object1 changes.
*
* It is possible to create a bidirectional binding between two properties
* of two Glib::ObjectBase instances, so that if either property changes, the
* other is updated as well, for instance:
*
* @code
* Glib::Binding::bind_property(object1->property_a(), object2->property_b(),
* Glib::BINDING_BIDIRECTIONAL);
* @endcode
*
* will keep the two properties in sync.
*
* It is also possible to set a custom transformation function (in both
* directions, in case of a bidirectional binding) to apply a custom
* transformation from the source value to the target value before
* applying it; for instance, the following binding:
*
* @code
* bool celsius_to_fahrenheit(const double& celsius, double& fahrenheit);
* bool fahrenheit_to_celsius(const double& fahrenheit, double& celsius);
* Glib::Binding::bind_property(adjustment1->property_value(),
* adjustment2->property_value(), Glib::BINDING_BIDIRECTIONAL,
* sigc::ptr_fun(celsius_to_fahrenheit), sigc::ptr_fun(fahrenheit_to_celsius));
* @endcode
*
* will keep property_value() of the two adjustments in sync; the
* celsius_to_fahrenheit() function will be called whenever
* property_value() of @a adjustment1 changes and will transform the current value
* of the property before applying it to property_value() of @a adjustment2.
*
* Vice versa, the fahrenheit_to_celsius() function will be called whenever
* property_value() of @a adjustment2 changes, and will transform the
* current value of the property before applying it to property_value()
* of @a adjustment1.
*
* Note that Glib::Binding does not resolve cycles by itself; a cycle like
*
* @code
* object1->property_A() -> object2->property_B()
* object2->property_B() -> object3->property_C()
* object3->property_C() -> object1->property_A()
* @endcode
*
* might lead to an infinite loop. The loop, in this particular case,
* can be avoided if the objects emit the GObject::notify signal only
* if the value has effectively been changed. A binding is implemented
* using the GObject::notify signal, so it is susceptible to all the
* various ways of blocking a signal emission, like Glib::SignalProxyNormal::emission_stop()
* or g_signal_handler_block().
*
* A binding will be severed, and the resources it allocates freed, whenever
* either one of the Glib::ObjectBase instances it refers to is deleted,
* when unbind() is called, or when the Glib::Binding instance loses
* its last reference.
*
* @newin{2,44}
*/
class Binding : public Glib::Object
{
#ifndef DOXYGEN_SHOULD_SKIP_THIS
public:
using CppObjectType = Binding;
using CppClassType = Binding_Class;
using BaseObjectType = GBinding;
using BaseClassType = GBindingClass;
// noncopyable
Binding(const Binding&) = delete;
Binding& operator=(const Binding&) = delete;
private: friend class Binding_Class;
static CppClassType binding_class_;
protected:
explicit Binding(const Glib::ConstructParams& construct_params);
explicit Binding(GBinding* castitem);
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
public:
Binding(Binding&& src) noexcept;
Binding& operator=(Binding&& src) noexcept;
~Binding() noexcept override;
/** Get the GType for this class, for use with the underlying GObject type system.
*/
static GType get_type() G_GNUC_CONST;
#ifndef DOXYGEN_SHOULD_SKIP_THIS
static GType get_base_type() G_GNUC_CONST;
#endif
///Provides access to the underlying C GObject.
GBinding* gobj() { return reinterpret_cast<GBinding*>(gobject_); }
///Provides access to the underlying C GObject.
const GBinding* gobj() const { return reinterpret_cast<GBinding*>(gobject_); }
///Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
GBinding* gobj_copy();
private:
public:
/** For instance,<br>
* bool on_transform_to(const GValue* from_value, GValue* to_value);
*
* @return <tt>true</tt> if the transformation was successful, and <tt>false</tt> otherwise.
*/
using SlotTransform = sigc::slot<bool, const GValue*, GValue*>;
/** Creates a binding between @a source_property and @a target_property,
* allowing you to set the transformation functions to be used by the binding.
*
* If @a flags contains Glib::BINDING_BIDIRECTIONAL then the binding will be mutual:
* if @a target_property changes then the @a source_property
* will be updated as well. The @a transform_from function is only used in case
* of bidirectional bindings, otherwise it will be ignored.
*
* The binding will automatically be removed when either the source or the
* target instance is deleted. To remove the binding without affecting the
* source and the target you can call unbind() on the returned Binding instance.
*
* A Glib::ObjectBase instance can have multiple bindings.
*
* If you supply transformation functions, it is usually easier to use one of the
* bind_property() overloads, to avoid the use of GValue in the transformation functions.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @param transform_to The transformation function from the source to the target,
* or an empty slot to use the default.
* @param transform_from The transformation function from the target to the source,
* or an empty slot to use the default.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @newin{2,44}
*/
static Glib::RefPtr<Binding> bind_property_value(
const PropertyProxy_Base& source_property,
const PropertyProxy_Base& target_property,
BindingFlags flags = BINDING_DEFAULT,
const SlotTransform& transform_to = SlotTransform(),
const SlotTransform& transform_from = SlotTransform());
/** Creates a binding between @a source_property and @a target_property.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @see bind_property_value()
*
* @newin{2,44}
*/
static Glib::RefPtr<Binding> bind_property(
const PropertyProxy_Base& source_property,
const PropertyProxy_Base& target_property,
BindingFlags flags = BINDING_DEFAULT)
{
return bind_property_value(source_property, target_property, flags);
}
/** Creates a binding between @a source_property and @a target_property,
* allowing you to set a transformation function to be used by the binding.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @param transform_to The transformation function from the source to the target,
* or an empty slot to use the default.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @tparam T_source Type of the source property. Must be a type that can be
* stored in a Glib::Value<T_source> object.
* @tparam T_target Type of the target property. Must be a type that can be
* stored in a Glib::Value<T_target> object.
* @tparam T_functor_to Type of functor that translates from the source to the target.
* Must be convertible to<br>
* sigc::slot<bool, const T_source&, T_target&>.
*
* @see bind_property_value()
*
* @newin{2,44}
*/
template <typename T_source, typename T_target, typename T_functor_to>
static Glib::RefPtr<Binding> bind_property(
const PropertyProxy<T_source>& source_property,
const PropertyProxy<T_target>& target_property,
BindingFlags flags,
const T_functor_to& transform_to)
{
sigc::slot<bool, const T_source&, T_target&> slot_transform_to = transform_to;
return bind_property_value(source_property, target_property, flags,
slot_transform_to.empty() ? SlotTransform() : TransformProp<T_source, T_target>(slot_transform_to));
}
/** Creates a binding between @a source_property and @a target_property,
* allowing you to set a transformation function to be used by the binding.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @param transform_to The transformation function from the source to the target,
* or an empty slot to use the default.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @tparam T_source Type of the source property. Must be a type that can be
* stored in a Glib::Value<T_source> object.
* @tparam T_target Type of the target property. Must be a type that can be
* stored in a Glib::Value<T_target> object.
* @tparam T_functor_to Type of functor that translates from the source to the target.
* Must be convertible to<br>
* sigc::slot<bool, const T_source&, T_target&>.
*
* @see bind_property_value()
*
* @newin{2,44}
*/
template <typename T_source, typename T_target, typename T_functor_to>
static Glib::RefPtr<Binding> bind_property(
const PropertyProxy<T_source>& source_property,
const PropertyProxy_WriteOnly<T_target>& target_property,
BindingFlags flags,
const T_functor_to& transform_to)
{
sigc::slot<bool, const T_source&, T_target&> slot_transform_to = transform_to;
return bind_property_value(source_property, target_property, flags,
slot_transform_to.empty() ? SlotTransform() : TransformProp<T_source, T_target>(slot_transform_to));
}
/** Creates a binding between @a source_property and @a target_property,
* allowing you to set a transformation function to be used by the binding.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @param transform_to The transformation function from the source to the target,
* or an empty slot to use the default.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @tparam T_source Type of the source property. Must be a type that can be
* stored in a Glib::Value<T_source> object.
* @tparam T_target Type of the target property. Must be a type that can be
* stored in a Glib::Value<T_target> object.
* @tparam T_functor_to Type of functor that translates from the source to the target.
* Must be convertible to<br>
* sigc::slot<bool, const T_source&, T_target&>.
*
* @see bind_property_value()
*
* @newin{2,44}
*/
template <typename T_source, typename T_target, typename T_functor_to>
static Glib::RefPtr<Binding> bind_property(
const PropertyProxy_ReadOnly<T_source>& source_property,
const PropertyProxy<T_target>& target_property,
BindingFlags flags,
const T_functor_to& transform_to)
{
sigc::slot<bool, const T_source&, T_target&> slot_transform_to = transform_to;
return bind_property_value(source_property, target_property, flags,
slot_transform_to.empty() ? SlotTransform() : TransformProp<T_source, T_target>(slot_transform_to));
}
/** Creates a binding between @a source_property and @a target_property,
* allowing you to set a transformation function to be used by the binding.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @param transform_to The transformation function from the source to the target,
* or an empty slot to use the default.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @tparam T_source Type of the source property. Must be a type that can be
* stored in a Glib::Value<T_source> object.
* @tparam T_target Type of the target property. Must be a type that can be
* stored in a Glib::Value<T_target> object.
* @tparam T_functor_to Type of functor that translates from the source to the target.
* Must be convertible to<br>
* sigc::slot<bool, const T_source&, T_target&>.
*
* @see bind_property_value()
*
* @newin{2,44}
*/
template <typename T_source, typename T_target, typename T_functor_to>
static Glib::RefPtr<Binding> bind_property(
const PropertyProxy_ReadOnly<T_source>& source_property,
const PropertyProxy_WriteOnly<T_target>& target_property,
BindingFlags flags,
const T_functor_to& transform_to)
{
sigc::slot<bool, const T_source&, T_target&> slot_transform_to = transform_to;
return bind_property_value(source_property, target_property, flags,
slot_transform_to.empty() ? SlotTransform() : TransformProp<T_source, T_target>(slot_transform_to));
}
/** Creates a binding between @a source_property and @a target_property,
* allowing you to set the transformation functions to be used by the binding.
*
* @param source_property The source property to bind.
* @param target_property The target property to bind.
* @param flags Flags to pass to Binding.
* @param transform_to The transformation function from the source to the target,
* or an empty slot to use the default.
* @param transform_from The transformation function from the target to the source,
* or an empty slot to use the default.
* @return The Binding instance representing the binding between the two
* Glib::ObjectBase instances, or <tt>nullptr</tt> in case of error.
*
* @tparam T_source Type of the source property. Must be a type that can be
* stored in a Glib::Value<T_source> object.
* @tparam T_target Type of the target property. Must be a type that can be
* stored in a Glib::Value<T_target> object.
* @tparam T_functor_to Type of functor that translates from the source to the target.
* Must be convertible to<br>
* sigc::slot<bool, const T_source&, T_target&>.
* @tparam T_functor_from Type of functor that translates from the target to the source.
* Must be convertible to<br>
* sigc::slot<bool, const T_target&, T_source&>.
*
* @see bind_property_value()
*
* @newin{2,44}
*/
template <typename T_source, typename T_target, typename T_functor_to, typename T_functor_from>
static Glib::RefPtr<Binding> bind_property(
const PropertyProxy<T_source>& source_property,
const PropertyProxy<T_target>& target_property,
BindingFlags flags,
const T_functor_to& transform_to,
const T_functor_from& transform_from)
{
sigc::slot<bool, const T_source&, T_target&> slot_transform_to = transform_to;
sigc::slot<bool, const T_target&, T_source&> slot_transform_from = transform_from;
return bind_property_value(source_property, target_property, flags,
slot_transform_to.empty() ? SlotTransform() : TransformProp<T_source, T_target>(slot_transform_to),
slot_transform_from.empty() ? SlotTransform() : TransformProp<T_target, T_source>(slot_transform_from));
}
/** Retrieves the Object instance used as the source of the binding.
*
* @newin{2,44}
*
* @return The source Object.
*/
Glib::RefPtr<Glib::ObjectBase> get_source();
/** Retrieves the Object instance used as the source of the binding.
*
* @newin{2,44}
*
* @return The source Object.
*/
Glib::RefPtr<const Glib::ObjectBase> get_source() const;
/** Retrieves the name of the property of Binding::property_source() used as the source
* of the binding.
*
* @newin{2,44}
*
* @return The name of the source property.
*/
Glib::ustring get_source_property() const;
/** Retrieves the Object instance used as the target of the binding.
*
* @newin{2,44}
*
* @return The target Object.
*/
Glib::RefPtr<Glib::ObjectBase> get_target();
/** Retrieves the Object instance used as the target of the binding.
*
* @newin{2,44}
*
* @return The target Object.
*/
Glib::RefPtr<const Glib::ObjectBase> get_target() const;
/** Retrieves the name of the property of Binding::property_target() used as the target
* of the binding.
*
* @newin{2,44}
*
* @return The name of the target property.
*/
Glib::ustring get_target_property() const;
/** Retrieves the flags passed when constructing the Binding.
*
* @newin{2,44}
*
* @return The BindingFlags used by the Binding.
*/
BindingFlags get_flags() const;
/** Explicitly releases the binding between the source and the target
* property expressed by this Binding instance.
*
* The binding is also released if either the source object or the target
* object is deleted, or this Binding instance loses its last reference,
* i.e. there is no more Glib::RefPtr that holds a pointer to it.
*
* @newin{2,44}
*/
void unbind();
/** Flags to be used to control the Binding
*
* @newin{2,44}
*
* Default value: BINDING_DEFAULT
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< Glib::BindingFlags > property_flags() const;
/** The Object that should be used as the source of the binding
*
* @newin{2,44}
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Glib::ObjectBase> > property_source() const;
/** The name of the property of Binding::property_source() that should be used
* as the source of the binding
*
* @newin{2,44}
*
* Default value: ""
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< Glib::ustring > property_source_property() const;
/** The Object that should be used as the target of the binding
*
* @newin{2,44}
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Glib::ObjectBase> > property_target() const;
/** The name of the property of Binding::property_target() that should be used
* as the target of the binding
*
* @newin{2,44}
*
* Default value: ""
*
* @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
* or receive notification when the value of the property changes.
*/
Glib::PropertyProxy_ReadOnly< Glib::ustring > property_target_property() const;
#ifndef DOXYGEN_SHOULD_SKIP_THIS
/** Decrement the reference count for this object.
* You should never need to do this manually - use the object via a RefPtr instead.
*/
void unreference() const override;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
private:
// The functor TransformProp can be implicitly converted to a SlotTransform
// and used in a call to bind_property_value().
template <typename T_from, typename T_to>
class TransformProp : public sigc::functor_base
{
public:
using result_type = bool;
using SlotTypedTransform = sigc::slot<bool, const T_from&, T_to&>;
TransformProp(const SlotTypedTransform& slot) : typed_transform(slot) {}
bool operator()(const GValue* from_value, GValue* to_value)
{
Glib::Value<T_from> from_glib_value;
from_glib_value.init(from_value);
Glib::Value<T_to> to_glib_value;
to_glib_value.init(to_value);
T_to to = to_glib_value.get();
const bool result = typed_transform(from_glib_value.get(), to);
to_glib_value.set(to);
g_value_copy(to_glib_value.gobj(), to_value);
return result;
}
private:
SlotTypedTransform typed_transform;
};
public:
public:
//C++ methods used to invoke GTK+ virtual functions:
protected:
//GTK+ Virtual Functions (override these to change behaviour):
//Default Signal Handlers::
};
} // namespace Glib
namespace Glib
{
/** A Glib::wrap() method for this object.
*
* @param object The C instance.
* @param take_copy False if the result should take ownership of the C instance. True if it should take a new copy or ref.
* @result A C++ instance that wraps this C instance.
*
* @relates Glib::Binding
*/
Glib::RefPtr<Glib::Binding> wrap(GBinding* object, bool take_copy = false);
}
#endif /* _GLIBMM_BINDING_H */
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