pub struct Binding { /* private fields */ }
Expand description
GObject
instance (or source) and another property on another GObject
instance (or target).
Whenever the source property changes, the same value is applied to the target property; for instance, the following binding:
⚠️ The following code is in c ⚠️
g_object_bind_property (object1, "property-a",
object2, "property-b",
G_BINDING_DEFAULT);
will cause the property named “property-b” of object2
to be updated
every time [methodObject
] or the specific accessor changes the value of
the property “property-a” of object1
.
It is possible to create a bidirectional binding between two properties
of two GObject
instances, so that if either property changes, the
other is updated as well, for instance:
⚠️ The following code is in c ⚠️
g_object_bind_property (object1, "property-a",
object2, "property-b",
G_BINDING_BIDIRECTIONAL);
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:
⚠️ The following code is in c ⚠️
g_object_bind_property_full (adjustment1, "value",
adjustment2, "value",
G_BINDING_BIDIRECTIONAL,
celsius_to_fahrenheit,
fahrenheit_to_celsius,
NULL, NULL);
will keep the “value” property of the two adjustments in sync; the
celsius_to_fahrenheit
function will be called whenever the “value”
property of adjustment1
changes and will transform the current value
of the property before applying it to the “value” property of adjustment2
.
Vice versa, the fahrenheit_to_celsius
function will be called whenever
the “value” property of adjustment2
changes, and will transform the
current value of the property before applying it to the “value” property
of adjustment1
.
Note that Binding
does not resolve cycles by itself; a cycle like
object1:propertyA -> object2:propertyB
object2:propertyB -> object3:propertyC
object3:propertyC -> object1:propertyA
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 [funcObject
]
or [funcObject
].
A binding will be severed, and the resources it allocates freed, whenever
either one of the GObject
instances it refers to are finalized, or when
the Binding
instance loses its last reference.
Bindings for languages with garbage collection can use
[methodObject
.unbind] to explicitly release a binding between the source
and target properties, instead of relying on the last reference on the
binding, source, and target instances to drop.
§Properties
§flags
Flags to be used to control the Binding
Readable | Writeable | Construct Only
§source
The Object
that should be used as the source of the binding
Readable | Writeable | Construct Only
§source-property
The name of the property of source
that should be used
as the source of the binding.
This should be in [canonical form][canonical-parameter-names] to get the best performance.
Readable | Writeable | Construct Only
§target
The Object
that should be used as the target of the binding
Readable | Writeable | Construct Only
§target-property
The name of the property of target
that should be used
as the target of the binding.
This should be in [canonical form][canonical-parameter-names] to get the best performance.
Readable | Writeable | Construct Only
§Implements
ObjectExt
GObject
instance (or source) and another property on another GObject
instance (or target).
Whenever the source property changes, the same value is applied to the target property; for instance, the following binding:
⚠️ The following code is in c ⚠️
g_object_bind_property (object1, "property-a",
object2, "property-b",
G_BINDING_DEFAULT);
will cause the property named “property-b” of object2
to be updated
every time [methodObject
] or the specific accessor changes the value of
the property “property-a” of object1
.
It is possible to create a bidirectional binding between two properties
of two GObject
instances, so that if either property changes, the
other is updated as well, for instance:
⚠️ The following code is in c ⚠️
g_object_bind_property (object1, "property-a",
object2, "property-b",
G_BINDING_BIDIRECTIONAL);
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:
⚠️ The following code is in c ⚠️
g_object_bind_property_full (adjustment1, "value",
adjustment2, "value",
G_BINDING_BIDIRECTIONAL,
celsius_to_fahrenheit,
fahrenheit_to_celsius,
NULL, NULL);
will keep the “value” property of the two adjustments in sync; the
celsius_to_fahrenheit
function will be called whenever the “value”
property of adjustment1
changes and will transform the current value
of the property before applying it to the “value” property of adjustment2
.
Vice versa, the fahrenheit_to_celsius
function will be called whenever
the “value” property of adjustment2
changes, and will transform the
current value of the property before applying it to the “value” property
of adjustment1
.
Note that Binding
does not resolve cycles by itself; a cycle like
object1:propertyA -> object2:propertyB
object2:propertyB -> object3:propertyC
object3:propertyC -> object1:propertyA
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 [funcObject
]
or [funcObject
].
A binding will be severed, and the resources it allocates freed, whenever
either one of the GObject
instances it refers to are finalized, or when
the Binding
instance loses its last reference.
Bindings for languages with garbage collection can use
[methodObject
.unbind] to explicitly release a binding between the source
and target properties, instead of relying on the last reference on the
binding, source, and target instances to drop.
§Properties
§flags
Flags to be used to control the Binding
Readable | Writeable | Construct Only
§source
The Object
that should be used as the source of the binding
Readable | Writeable | Construct Only
§source-property
The name of the property of source
that should be used
as the source of the binding.
This should be in [canonical form][canonical-parameter-names] to get the best performance.
Readable | Writeable | Construct Only
§target
The Object
that should be used as the target of the binding
Readable | Writeable | Construct Only
§target-property
The name of the property of target
that should be used
as the target of the binding.
This should be in [canonical form][canonical-parameter-names] to get the best performance.
Readable | Writeable | Construct Only
§Implements
GLib type: GObject with reference counted clone semantics.
Implementations§
Source§impl Binding
impl Binding
Sourcepub fn flags(&self) -> BindingFlags
pub fn flags(&self) -> BindingFlags
Retrieves the flags passed when constructing the Binding
.
§Returns
the BindingFlags
used by the Binding
Retrieves the flags passed when constructing the Binding
.
§Returns
the BindingFlags
used by the Binding
Sourcepub fn source_property(&self) -> GString
pub fn source_property(&self) -> GString
Sourcepub fn target_property(&self) -> GString
pub fn target_property(&self) -> GString
Sourcepub fn unbind(&self)
pub fn unbind(&self)
Explicitly releases the binding between the source and the target
property expressed by self
.
This function will release the reference that is being held on
the self
instance if the binding is still bound; if you want to hold on
to the Binding
instance after calling unbind()
, you will need
to hold a reference to it.
Note however that this function does not take ownership of self
, it
only unrefs the reference that was initially created by
ObjectExt::bind_property()
and is owned by the binding.
Explicitly releases the binding between the source and the target
property expressed by self
.
This function will release the reference that is being held on
the self
instance if the binding is still bound; if you want to hold on
to the Binding
instance after calling unbind()
, you will need
to hold a reference to it.
Note however that this function does not take ownership of self
, it
only unrefs the reference that was initially created by
ObjectExt::bind_property()
and is owned by the binding.
Trait Implementations§
Source§impl HasParamSpec for Binding
impl HasParamSpec for Binding
Source§impl Ord for Binding
impl Ord for Binding
Source§fn cmp(&self, other: &Self) -> Ordering
fn cmp(&self, other: &Self) -> Ordering
Comparison for two GObjects.
Compares the memory addresses of the provided objects.
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Source§impl<OT: ObjectType> PartialEq<OT> for Binding
impl<OT: ObjectType> PartialEq<OT> for Binding
Source§impl<OT: ObjectType> PartialOrd<OT> for Binding
impl<OT: ObjectType> PartialOrd<OT> for Binding
Source§impl StaticType for Binding
impl StaticType for Binding
Source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for Binding
impl Send for Binding
impl Sync for Binding
Auto Trait Implementations§
impl Freeze for Binding
impl RefUnwindSafe for Binding
impl Unpin for Binding
impl UnwindSafe for Binding
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T: ?Sized,
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T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
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T: ObjectType,
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T: ObjectType,
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) -> SignalHandlerId
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&self,
signal_id: SignalId,
details: Option<Quark>,
after: bool,
closure: RustClosure,
) -> SignalHandlerId
fn connect_closure_id( &self, signal_id: SignalId, details: Option<Quark>, after: bool, closure: RustClosure, ) -> SignalHandlerId
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closure
to the lifetime of the object. When
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&self,
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&self,
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&self,
signal_id: SignalId,
details: Quark,
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&self,
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Source§fn connect_notify<F>(&self, name: Option<&str>, f: F) -> SignalHandlerId
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&self,
name: Option<&str>,
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) -> SignalHandlerId
unsafe fn connect_notify_unsafe<F>( &self, name: Option<&str>, f: F, ) -> SignalHandlerId
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&'a self,
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fn bind_property<'a, 'f, 't, O>(
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