Struct glib::TypePlugin
source · pub struct TypePlugin { /* private fields */ }
Expand description
An interface that handles the lifecycle of dynamically loaded types.
The GObject type system supports dynamic loading of types. It goes as follows:
- The type is initially introduced (usually upon loading the module the first time, or by your main application that knows what modules introduces what types), like this: ⚠️ The following code is in c ⚠️
new_type_id = g_type_register_dynamic (parent_type_id,
"TypeName",
new_type_plugin,
type_flags);
where new_type_plugin
is an implementation of the
GTypePlugin
interface.
-
The type’s implementation is referenced, e.g. through [func
Object
.ref] or through [funcObject
] (this is being called by [ctorObject
.new]) or through one of the above done on a type derived fromnew_type_id
. -
This causes the type system to load the type’s implementation by calling [method
Object
.use] and [methodObject
.complete_type_info] onnew_type_plugin
. -
At some point the type’s implementation isn’t required anymore, e.g. after [method
Object
.unref] or [funcObject
] (called when the reference count of an instance drops to zero). -
This causes the type system to throw away the information retrieved from [method
Object
.complete_type_info] and then it calls [methodObject
.unuse] onnew_type_plugin
. -
Things may repeat from the second step.
So basically, you need to implement a GTypePlugin
type that
carries a use_count, once use_count goes from zero to one, you need
to load the implementation to successfully handle the upcoming
[methodObject
.complete_type_info] call. Later, maybe after
succeeding use/unuse calls, once use_count drops to zero, you can
unload the implementation again. The type system makes sure to call
[methodObject
.use] and [methodObject
.complete_type_info]
again when the type is needed again.
[classObject
] is an implementation of GTypePlugin
that
already implements most of this except for the actual module loading and
unloading. It even handles multiple registered types per module.
§Implements
Implementations§
source§impl TypePlugin
impl TypePlugin
pub const NONE: Option<&'static TypePlugin> = None
Trait Implementations§
source§impl Clone for TypePlugin
impl Clone for TypePlugin
source§impl Debug for TypePlugin
impl Debug for TypePlugin
source§impl HasParamSpec for TypePlugin
impl HasParamSpec for TypePlugin
type ParamSpec = ParamSpecObject
§type SetValue = TypePlugin
type SetValue = TypePlugin
type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, TypePlugin>
fn param_spec_builder() -> Self::BuilderFn
source§impl Hash for TypePlugin
impl Hash for TypePlugin
source§impl<T: TypePluginImpl> IsImplementable<T> for TypePlugin
impl<T: TypePluginImpl> IsImplementable<T> for TypePlugin
source§fn interface_init(iface: &mut Interface<Self>)
fn interface_init(iface: &mut Interface<Self>)
source§fn instance_init(_instance: &mut InitializingObject<T>)
fn instance_init(_instance: &mut InitializingObject<T>)
source§impl Ord for TypePlugin
impl Ord for TypePlugin
source§impl<OT: ObjectType> PartialEq<OT> for TypePlugin
impl<OT: ObjectType> PartialEq<OT> for TypePlugin
source§impl<OT: ObjectType> PartialOrd<OT> for TypePlugin
impl<OT: ObjectType> PartialOrd<OT> for TypePlugin
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for TypePlugin
impl StaticType for TypePlugin
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for TypePlugin
impl IsA<TypePlugin> for TypeModule
Auto Trait Implementations§
impl Freeze for TypePlugin
impl RefUnwindSafe for TypePlugin
impl !Send for TypePlugin
impl !Sync for TypePlugin
impl Unpin for TypePlugin
impl UnwindSafe for TypePlugin
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T> Cast for Twhere
T: ObjectType,
impl<T> Cast for Twhere
T: ObjectType,
source§fn upcast<T: ObjectType>(self) -> Twhere
Self: IsA<T>,
fn upcast<T: ObjectType>(self) -> Twhere
Self: IsA<T>,
T
. Read moresource§fn upcast_ref<T: ObjectType>(&self) -> &Twhere
Self: IsA<T>,
fn upcast_ref<T: ObjectType>(&self) -> &Twhere
Self: IsA<T>,
T
. Read moresource§fn downcast<T: ObjectType>(self) -> Result<T, Self>where
Self: MayDowncastTo<T>,
fn downcast<T: ObjectType>(self) -> Result<T, Self>where
Self: MayDowncastTo<T>,
T
. Read moresource§fn downcast_ref<T: ObjectType>(&self) -> Option<&T>where
Self: MayDowncastTo<T>,
fn downcast_ref<T: ObjectType>(&self) -> Option<&T>where
Self: MayDowncastTo<T>,
T
. Read moresource§fn dynamic_cast<T: ObjectType>(self) -> Result<T, Self>
fn dynamic_cast<T: ObjectType>(self) -> Result<T, Self>
T
. This handles upcasting, downcasting
and casting between interface and interface implementors. All checks are performed at
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will do many checks at compile-time already. downcast
will
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T
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and upcast
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unsafe fn unsafe_cast<T: ObjectType>(self) -> T
T
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unsafe fn unsafe_cast_ref<T: ObjectType>(&self) -> &T
&T
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type GlibType = <T as GlibPtrDefault>::GlibType
source§impl<T> TryFromClosureReturnValue for Twhere
T: for<'a> FromValue<'a> + StaticType + 'static,
impl<T> TryFromClosureReturnValue for Twhere
T: for<'a> FromValue<'a> + StaticType + 'static,
source§impl<O> TypePluginExt for Owhere
O: IsA<TypePlugin>,
impl<O> TypePluginExt for Owhere
O: IsA<TypePlugin>,
source§fn complete_interface_info(
&self,
instance_type: Type,
interface_type: Type
) -> InterfaceInfo
fn complete_interface_info( &self, instance_type: Type, interface_type: Type ) -> InterfaceInfo
complete_interface_info
function from the
GTypePluginClass
of self
. There should be no need to use this
function outside of the GObject type system itself. Read moresource§fn complete_type_info(&self, g_type: Type) -> (TypeInfo, TypeValueTable)
fn complete_type_info(&self, g_type: Type) -> (TypeInfo, TypeValueTable)
complete_type_info
function from the GTypePluginClass
of self
.
There should be no need to use this function outside of the GObject
type system itself. Read moresource§fn unuse(&self)
fn unuse(&self)
unuse_plugin
function from the GTypePluginClass
of
self
. There should be no need to use this function outside of
the GObject type system itself.