glibmm
2.43.1
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Bind two object properties. More...
#include <glibmm/binding.h>
Public Types | |
typedef sigc::slot< bool, const Glib::RefPtr< Binding > &, const GValue*, GValue* > | BindingTransformSlot |
For instance, bool on_transform_to(const Glib::RefPtr<Binding>& binding, const GValue* from_value, GValue* to_value);. More... | |
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typedef void(* | DestroyNotify )(gpointer data) |
Public Member Functions | |
virtual | ~Binding () |
GBinding* | gobj () |
Provides access to the underlying C GObject. More... | |
const GBinding* | gobj () const |
Provides access to the underlying C GObject. More... | |
GBinding* | gobj_copy () |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More... | |
Glib::RefPtr< Glib::ObjectBase > | get_source () |
Retrieves the Object instance used as the source of the binding. More... | |
Glib::RefPtr< const Glib::ObjectBase > | get_source () const |
Retrieves the Object instance used as the source of the binding. More... | |
Glib::ustring | get_source_property () const |
Retrieves the name of the property of Binding::property_source() used as the source of the binding. More... | |
Glib::RefPtr< Glib::ObjectBase > | get_target () |
Retrieves the Object instance used as the target of the binding. More... | |
Glib::RefPtr< const Glib::ObjectBase > | get_target () const |
Retrieves the Object instance used as the target of the binding. More... | |
Glib::ustring | get_target_property () const |
Retrieves the name of the property of Binding::property_target() used as the target of the binding. More... | |
BindingFlags | get_flags () const |
Retrieves the flags passed when constructing the Binding. More... | |
void | unbind () |
Explicitly releases the binding between the source and the target property expressed by this Binding instance. More... | |
Glib::PropertyProxy_ReadOnly < Glib::BindingFlags > | property_flags () const |
The binding flags. More... | |
Glib::PropertyProxy_ReadOnly < Glib::RefPtr < Glib::ObjectBase > > | property_source () const |
The source of the binding. More... | |
Glib::PropertyProxy_ReadOnly < Glib::ustring > | property_source_property () const |
The property on the source to bind. More... | |
Glib::PropertyProxy_ReadOnly < Glib::RefPtr < Glib::ObjectBase > > | property_target () const |
The target of the binding. More... | |
Glib::PropertyProxy_ReadOnly < Glib::ustring > | property_target_property () const |
The property on the target to bind. More... | |
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void* | get_data (const QueryQuark& key) |
void | set_data (const Quark& key, void* data) |
void | set_data (const Quark& key, void* data, DestroyNotify notify) |
void | remove_data (const QueryQuark& quark) |
void* | steal_data (const QueryQuark& quark) |
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void | set_property_value (const Glib::ustring& property_name, const Glib::ValueBase& value) |
You probably want to use a specific property_*() accessor method instead. More... | |
void | get_property_value (const Glib::ustring& property_name, Glib::ValueBase& value) const |
You probably want to use a specific property_*() accessor method instead. More... | |
template<class PropertyType > | |
void | set_property (const Glib::ustring& property_name, const PropertyType& value) |
You probably want to use a specific property_*() accessor method instead. More... | |
template<class PropertyType > | |
void | get_property (const Glib::ustring& property_name, PropertyType& value) const |
You probably want to use a specific property_*() accessor method instead. More... | |
void | connect_property_changed (const Glib::ustring& property_name, const sigc::slot< void >& slot) |
You can use the signal_changed() signal of the property proxy instead, but this is necessary when using the reduced API. More... | |
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, const sigc::slot< void >& slot) |
You can use the signal_changed() signal of the property proxy instead, but this is necessary when using the reduced API. More... | |
void | freeze_notify () |
Increases the freeze count on object. More... | |
void | thaw_notify () |
Reverts the effect of a previous call to freeze_notify(). More... | |
virtual void | reference () const |
Increment the reference count for this object. More... | |
virtual void | unreference () const |
Decrement the reference count for this object. More... | |
GObject* | gobj () |
Provides access to the underlying C GObject. More... | |
const GObject* | gobj () const |
Provides access to the underlying C GObject. More... | |
GObject* | gobj_copy () const |
Give a ref-ed copy to someone. Use for direct struct access. More... | |
Static Public Member Functions | |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. More... | |
static Glib::RefPtr< Binding > | bind_property_value (const PropertyProxy_Base& source_property, const PropertyProxy_Base& target_property, BindingFlags flags=BINDING_DEFAULT, const BindingTransformSlot& transform_to=BindingTransformSlot(), const BindingTransformSlot& transform_from=BindingTransformSlot()) |
Creates a binding between source_property and target_property, allowing you to set the transformation functions to be used by the binding. More... | |
static Glib::RefPtr< Binding > | bind_property (const PropertyProxy_Base& source_property, const PropertyProxy_Base& target_property, BindingFlags flags=BINDING_DEFAULT) |
Creates a binding between source_property and target_property. More... | |
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) |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding. More... | |
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) |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding. More... | |
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) |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding. More... | |
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) |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding. More... | |
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) |
Creates a binding between source_property and target_property, allowing you to set the transformation functions to be used by the binding. More... | |
Related Functions | |
(Note that these are not member functions.) | |
Glib::RefPtr< Glib::Binding > | wrap (GBinding* object, bool take_copy=false) |
A Glib::wrap() method for this object. More... | |
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Glib::RefPtr< Glib::Object > | wrap (GObject* object, bool take_copy=false) |
Additional Inherited Members | |
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Object () | |
Object (const Glib::ConstructParams& construct_params) | |
Object (GObject* castitem) | |
virtual | ~Object () |
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ObjectBase () | |
This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor. More... | |
ObjectBase (const char* custom_type_name) | |
A derived constructor always overrides this choice. More... | |
ObjectBase (const std::type_info& custom_type_info) | |
This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually. More... | |
virtual | ~ObjectBase ()=0 |
void | initialize (GObject* castitem) |
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:
will cause property_b() of object2 to be updated every time the value of property_a() of 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:
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:
will keep property_value() of the two adjustments in sync; the celsius_to_fahrenheit() function will be called whenever property_value() of adjustment1 changes and will transform the current value of the property before applying it to property_value() of adjustment2.
Vice versa, the fahrenheit_to_celsius() function will be called whenever property_value() of adjustment2 changes, and will transform the current value of the property before applying it to property_value() of adjustment1.
Note that Glib::Binding does not resolve cycles by itself; a cycle like
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.
typedef sigc::slot<bool, const Glib::RefPtr<Binding>&, const GValue*, GValue*> Glib::Binding::BindingTransformSlot |
For instance,
bool on_transform_to(const Glib::RefPtr<Binding>& binding, const GValue* from_value, GValue* to_value);.
true
if the transformation was successful, and false
otherwise.
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virtual |
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inlinestatic |
Creates a binding between source_property and target_property.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
0
in case of error.
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inlinestatic |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
transform_to | The transformation function from the source to the target, or an empty slot to use the default. |
0
in case of error.T_source | Type of the source property. Must be a type that can be stored in a Glib::Value<T_source> object. |
T_target | Type of the target property. Must be a type that can be stored in a Glib::Value<T_target> object. |
T_functor_to | Type of functor that translates from the source to the target. Must be convertible to sigc::slot<bool, const Glib::RefPtr<Binding>&, const T_source&, T_target&>. |
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inlinestatic |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
transform_to | The transformation function from the source to the target, or an empty slot to use the default. |
0
in case of error.T_source | Type of the source property. Must be a type that can be stored in a Glib::Value<T_source> object. |
T_target | Type of the target property. Must be a type that can be stored in a Glib::Value<T_target> object. |
T_functor_to | Type of functor that translates from the source to the target. Must be convertible to sigc::slot<bool, const Glib::RefPtr<Binding>&, const T_source&, T_target&>. |
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inlinestatic |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
transform_to | The transformation function from the source to the target, or an empty slot to use the default. |
0
in case of error.T_source | Type of the source property. Must be a type that can be stored in a Glib::Value<T_source> object. |
T_target | Type of the target property. Must be a type that can be stored in a Glib::Value<T_target> object. |
T_functor_to | Type of functor that translates from the source to the target. Must be convertible to sigc::slot<bool, const Glib::RefPtr<Binding>&, const T_source&, T_target&>. |
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inlinestatic |
Creates a binding between source_property and target_property, allowing you to set a transformation function to be used by the binding.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
transform_to | The transformation function from the source to the target, or an empty slot to use the default. |
0
in case of error.T_source | Type of the source property. Must be a type that can be stored in a Glib::Value<T_source> object. |
T_target | Type of the target property. Must be a type that can be stored in a Glib::Value<T_target> object. |
T_functor_to | Type of functor that translates from the source to the target. Must be convertible to sigc::slot<bool, const Glib::RefPtr<Binding>&, const T_source&, T_target&>. |
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inlinestatic |
Creates a binding between source_property and target_property, allowing you to set the transformation functions to be used by the binding.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
transform_to | The transformation function from the source to the target, or an empty slot to use the default. |
transform_from | The transformation function from the target to the source, or an empty slot to use the default. |
0
in case of error.T_source | Type of the source property. Must be a type that can be stored in a Glib::Value<T_source> object. |
T_target | Type of the target property. Must be a type that can be stored in a Glib::Value<T_target> object. |
T_functor_to | Type of functor that translates from the source to the target. Must be convertible to sigc::slot<bool, const Glib::RefPtr<Binding>&, const T_source&, T_target&>. |
T_functor_from | Type of functor that translates from the target to the source. Must be convertible to sigc::slot<bool, const Glib::RefPtr<Binding>&, const T_target&, T_source&>. |
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static |
Creates a binding between source_property and target_property, allowing you to set the transformation functions to be used by the binding.
If flags contains Glib::BINDING_BIDIRECTIONAL then the binding will be mutual: if target_property changes then the source_property will be updated as well. The 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.
source_property | The source property to bind. |
target_property | The target property to bind. |
flags | Flags to pass to Binding. |
transform_to | The transformation function from the source to the target, or an empty slot to use the default. |
transform_from | The transformation function from the target to the source, or an empty slot to use the default. |
0
in case of error.BindingFlags Glib::Binding::get_flags | ( | ) | const |
Glib::RefPtr<Glib::ObjectBase> Glib::Binding::get_source | ( | ) |
Glib::RefPtr<const Glib::ObjectBase> Glib::Binding::get_source | ( | ) | const |
Glib::ustring Glib::Binding::get_source_property | ( | ) | const |
Retrieves the name of the property of Binding::property_source() used as the source of the binding.
Glib::RefPtr<Glib::ObjectBase> Glib::Binding::get_target | ( | ) |
Glib::RefPtr<const Glib::ObjectBase> Glib::Binding::get_target | ( | ) | const |
Glib::ustring Glib::Binding::get_target_property | ( | ) | const |
Retrieves the name of the property of Binding::property_target() used as the target of the binding.
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static |
Get the GType for this class, for use with the underlying GObject type system.
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inline |
Provides access to the underlying C GObject.
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inline |
Provides access to the underlying C GObject.
GBinding* Glib::Binding::gobj_copy | ( | ) |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
Glib::PropertyProxy_ReadOnly< Glib::BindingFlags > Glib::Binding::property_flags | ( | ) | const |
The binding flags.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Glib::ObjectBase> > Glib::Binding::property_source | ( | ) | const |
The source of the binding.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
Glib::PropertyProxy_ReadOnly< Glib::ustring > Glib::Binding::property_source_property | ( | ) | const |
The property on the source to bind.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Glib::ObjectBase> > Glib::Binding::property_target | ( | ) | const |
The target of the binding.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
Glib::PropertyProxy_ReadOnly< Glib::ustring > Glib::Binding::property_target_property | ( | ) | const |
The property on the target to bind.
You rarely need to use properties because there are get_ and set_ methods for almost all of them.
void Glib::Binding::unbind | ( | ) |
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.
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related |
A Glib::wrap() method for this object.
object | The C instance. |
take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref. |