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721 lines
20 KiB
Plaintext
721 lines
20 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GObject
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<!-- ##### SECTION Short_Description ##### -->
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The base object type
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### STRUCT GObject ##### -->
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<para>
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All the fields in the <structname>GObject</structname> structure are private
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to the #GObject implementation and should never be accessed directly.
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</para>
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@g_type_instance:
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<!-- ##### STRUCT GObjectClass ##### -->
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<para>
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</para>
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@g_type_class:
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<!-- ##### USER_FUNCTION GObjectGetPropertyFunc ##### -->
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<para>
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</para>
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@object:
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@property_id:
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@value:
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@pspec:
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<!-- ##### USER_FUNCTION GObjectSetPropertyFunc ##### -->
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<para>
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</para>
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@object:
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@property_id:
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@value:
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@pspec:
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<!-- ##### USER_FUNCTION GObjectFinalizeFunc ##### -->
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<para>
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</para>
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@object:
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<!-- ##### MACRO G_TYPE_IS_OBJECT ##### -->
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<para>
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Returns a boolean value of %FALSE or %TRUE indicating whether
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the passed in type id is a %G_TYPE_OBJECT or derived from it.
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</para>
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@type: Type id to check for is a %G_TYPE_OBJECT relationship.
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@Returns: %FALSE or %TRUE, indicating whether @type is a %G_TYPE_OBJECT.
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<!-- ##### MACRO G_OBJECT ##### -->
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<para>
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Casts a #GObject or derived pointer into a (GObject*) pointer.
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Depending on the current debugging level, this function may invoke
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certain runtime checks to identify invalid casts.
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</para>
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@object: Object which is subject to casting.
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<!-- ##### MACRO G_IS_OBJECT ##### -->
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<para>
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Checks whether a valid #GTypeInstance pointer is of type %G_TYPE_OBJECT.
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</para>
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@object: Instance to check for being a %G_TYPE_OBJECT.
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<!-- ##### MACRO G_OBJECT_CLASS ##### -->
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<para>
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Casts a derived #GObjectClass structure into a #GObjectClass structure.
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</para>
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@class: a valid #GObjectClass
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<!-- ##### MACRO G_IS_OBJECT_CLASS ##### -->
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<para>
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Checks whether @class "is a" valid #GObjectClass structure of type
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%G_TYPE_OBJECT or derived.
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</para>
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@class: a #GObjectClass
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<!-- ##### MACRO G_OBJECT_GET_CLASS ##### -->
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<para>
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Returns the class structure associated to a #GObject instance.
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</para>
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@object: a #GObject instance.
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<!-- ##### MACRO G_OBJECT_TYPE ##### -->
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<para>
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Return the type id of an object.
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</para>
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@object: Object to return the type id for.
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@Returns: Type id of @object.
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<!-- ##### MACRO G_OBJECT_TYPE_NAME ##### -->
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<para>
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Returns the name of an object's type.
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</para>
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@object: Object to return the type name for.
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@Returns: Type name of @object. The string is owned by the type system and
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should not be freed.
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<!-- ##### MACRO G_OBJECT_CLASS_TYPE ##### -->
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<para>
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Return the type id of a class structure.
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</para>
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@class: a valid #GObjectClass
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@Returns: Type id of @class.
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<!-- ##### MACRO G_OBJECT_CLASS_NAME ##### -->
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<para>
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Return the name of a class structure's type.
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</para>
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@class: a valid #GObjectClass
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@Returns: Type name of @class. The string is owned by the type system and
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should not be freed.
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<!-- ##### FUNCTION g_object_class_install_property ##### -->
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<para>
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Installs a new property. This is usually done in the class initializer.
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</para>
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@oclass: a #GObjectClass
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@property_id: the id for the new property
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@pspec: the #GParamSpec for the new property
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<!-- ##### FUNCTION g_object_class_find_property ##### -->
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<para>
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Looks up the #GParamSpec for a property of a class.
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</para>
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@oclass: a #GObjectClass
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@property_name: the name of the property to look up
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@Returns: the #GParamSpec for the property, or %NULL if the class doesn't have
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a property of that name
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<!-- ##### FUNCTION g_object_class_list_properties ##### -->
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<para>
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Returns an array of #GParamSpec* for all properties of a class.
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</para>
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@oclass: a #GObjectClass
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@n_properties: return location for the length of the returned array
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@Returns: an array of #GParamSpec* which should be freed after use
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<!-- ##### FUNCTION g_object_new ##### -->
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<para>
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Creates a new instance of a #GObject subtype and sets its properties.
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</para>
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<para>
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Construction parameters (see #G_PARAM_CONSTRUCT, #G_PARAM_CONSTRUCT_ONLY)
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which are not explicitly specified are set to their default values.
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</para>
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@object_type: the type id of the #GObject subtype to instantiate
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@first_property_name: the name of the first property
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@Varargs: the value of the first property, followed optionally by more
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name/value pairs, followed by %NULL
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@Returns: a new instance of @object_type
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<!-- ##### FUNCTION g_object_newv ##### -->
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<para>
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Creates a new instance of a #GObject subtype and sets its properties.
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</para>
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<para>
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Construction parameters (see #G_PARAM_CONSTRUCT, #G_PARAM_CONSTRUCT_ONLY)
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which are not explicitly specified are set to their default values.
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</para>
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@object_type: the type id of the #GObject subtype to instantiate
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@n_parameters: the length of the @parameters array
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@parameters: an array of #GParameter
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@Returns: a new instance of @object_type
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<!-- ##### STRUCT GParameter ##### -->
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<para>
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The <structname>GParameter</structname> struct is an auxiliary structure used
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to hand parameter name/value pairs to g_object_newv().
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</para>
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@name: the parameter name
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@value: the parameter value
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<!-- ##### FUNCTION g_object_ref ##### -->
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<para>
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Increases the reference count of @object.
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</para>
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@object: a #GObject
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@Returns: @object
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<!-- ##### FUNCTION g_object_unref ##### -->
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<para>
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Decreases the reference count if @object.
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When its reference count drops to 0, the object is finalized (i.e. its memory is freed).
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</para>
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@object: a #GObject
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<!-- ##### USER_FUNCTION GWeakNotify ##### -->
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<para>
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</para>
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@data:
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@where_the_object_was:
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<!-- ##### FUNCTION g_object_weak_ref ##### -->
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<para>
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Adds a weak reference callback to an object. Weak references are used for
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notification when an object is finalized. They are called "weak references"
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because they allow you to safely hold a pointer to an object without calling
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g_object_ref() (g_object_ref() adds a strong reference, that is, forces the
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object to stay alive).
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</para>
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@object: #GObject to reference weakly
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@notify: callback to invoke before the object is freed
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@data: extra data to pass to notify
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<!-- ##### FUNCTION g_object_weak_unref ##### -->
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<para>
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Removes a weak reference callback to an object.
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</para>
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@object: #GObject to remove a weak reference from
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@notify: callback to search for
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@data: data to search for
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<!-- ##### FUNCTION g_object_add_weak_pointer ##### -->
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<para>
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Adds a weak reference from weak_pointer to @object to indicate that
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the pointer located at @weak_pointer_location is only valid during the
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lifetime of @object. When the @object is finalized, @weak_pointer will
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be set to %NULL.
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</para>
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@object: The object that should be weak referenced.
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@weak_pointer_location: The memory address of a pointer.
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<!-- ##### FUNCTION g_object_remove_weak_pointer ##### -->
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<para>
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Removes a weak reference from @object that was previously added
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using g_object_add_weak_pointer(). The @weak_pointer_location has
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to match the one used with g_object_add_weak_pointer().
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</para>
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@object: The object that is weak referenced.
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@weak_pointer_location: The memory address of a pointer.
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<!-- ##### FUNCTION g_object_connect ##### -->
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<para>
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A convenience function to connect multiple signals at once.
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</para>
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<para>
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The signal specs expected by this function have the form
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"modifier::signal_name", where modifier can be one of the following:
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<variablelist>
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<varlistentry>
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<term>signal</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_data (...)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>object_signal</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_object (...)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>swapped_signal</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_data (..., G_CONNECT_SWAPPED)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>swapped_object_signal</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_object (..., G_CONNECT_SWAPPED)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>signal_after</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_data (..., G_CONNECT_AFTER)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>object_signal_after</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_object (..., G_CONNECT_AFTER)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>swapped_signal_after</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_data (..., G_CONNECT_SWAPPED | G_CONNECT_AFTER)</literal>
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>swapped_object_signal_after</term>
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<listitem><para>
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equivalent to <literal>g_signal_connect_object (..., G_CONNECT_SWAPPED | G_CONNECT_AFTER)</literal>
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</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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<informalexample>
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<programlisting>
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menu->toplevel = g_object_connect (g_object_new (GTK_TYPE_WINDOW,
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"type", GTK_WINDOW_POPUP,
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"child", menu,
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NULL),
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"signal::event", gtk_menu_window_event, menu,
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"signal::size_request", gtk_menu_window_size_request, menu,
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"signal::destroy", gtk_widget_destroyed, &menu->toplevel,
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NULL);
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</programlisting>
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</informalexample>
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@object: a #GObject
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@signal_spec: the spec for the first signal
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@Varargs: #GCallback for the first signal, followed by data for the first signal,
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followed optionally by more signal spec/callback/data triples,
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followed by %NULL
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@Returns: @object
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<!-- ##### FUNCTION g_object_disconnect ##### -->
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<para>
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A convenience function to disconnect multiple signals at once.
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</para>
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<para>
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The signal specs expected by this function have the form "any_signal", which
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means to disconnect any signal with matching callback and data, or
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"any_signal::signal_name", which only disconnects the signal named "signal_name".
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</para>
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@object: a #GObject
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@signal_spec: the spec for the first signal
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@Varargs: #GCallback for the first signal, followed by data for the first signal,
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followed optionally by more signal spec/callback/data triples,
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followed by %NULL
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<!-- ##### FUNCTION g_object_set ##### -->
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<para>
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Sets properties on an object.
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</para>
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@object: a #GObject
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@first_property_name: name of the first property to set
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@Varargs: value for the first property, followed optionally by more
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name/value pairs, followed by %NULL
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<!-- ##### FUNCTION g_object_get ##### -->
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<para>
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Gets properties of an object.
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</para>
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<para>
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In general, a copy is made of the property contents and the caller is
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responsible for freeing the memory in the appropriate manner for the type,
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for instance by calling g_free() or g_object_unref().
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</para>
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<example>
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<title>Using g_object_get(<!-- -->)</title>
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<para>
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An example of using g_object_get() to get the contents
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of three properties - one of type #G_TYPE_INT,
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one of type #G_TYPE_STRING, and one of type #G_TYPE_OBJECT:
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</para>
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<programlisting>
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gint intval;
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gchar *strval;
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GObject *objval;
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g_object_get (my_object,
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"intproperty", &intval,
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"strproperty", &strval,
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"objproperty", &objval,
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NULL);
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/* Do something with intval, strval, objval */
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g_free (strval);
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g_object_unref (objval);
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</programlisting>
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</example>
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@object: a #GObject
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@first_property_name: name of the first property to get
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@Varargs: return location for the first property, followed optionally by more
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name/return location pairs, followed by %NULL
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<!-- ##### FUNCTION g_object_notify ##### -->
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<para>
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Emits a "notify" signal for the property @property_name on @object.
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</para>
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@object: a #GObject
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@property_name: the name of a property installed on the class of @object.
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<!-- ##### FUNCTION g_object_freeze_notify ##### -->
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<para>
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Stops emission of "notify" signals on @object. The signals are
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queued until g_object_thaw_notify() is called on @object.
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</para>
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@object: a #GObject
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<!-- ##### FUNCTION g_object_thaw_notify ##### -->
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<para>
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Reverts the effect of a previous call to g_object_freeze_notify().
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This causes all queued "notify" signals on @object to be emitted.
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</para>
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@object: a #GObject
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<!-- ##### FUNCTION g_object_get_data ##### -->
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<para>
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Gets a named field from the objects table of associations (see g_object_set_data()).
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</para>
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@object: #GObject containing the associations
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@key: name of the key for that association
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@Returns: the data if found, or %NULL if no such data exists.
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<!-- ##### FUNCTION g_object_set_data ##### -->
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<para>
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Each object carries around a table of associations from
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strings to pointers. This function lets you set an association.
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</para>
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<para>
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If the object already had an association with that name,
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the old association will be destroyed.
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</para>
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@object: #GObject containing the associations.
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@key: name of the key
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@data: data to associate with that key
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<!-- ##### FUNCTION g_object_set_data_full ##### -->
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<para>
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Like g_object_set_data() except it adds notification
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for when the association is destroyed, either by setting it
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to a different value or when the object is destroyed.
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</para>
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@object: #GObject containing the associations
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@key: name of the key
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@data: data to associate with that key
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@destroy: function to call when the association is destroyed
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<!-- ##### FUNCTION g_object_steal_data ##### -->
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<para>
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Remove a specified datum from the object's data associations,
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without invoking the association's destroy handler.
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</para>
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@object: #GObject containing the associations
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@key: name of the key
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@Returns: the data if found, or %NULL if no such data exists.
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<!-- ##### FUNCTION g_object_get_qdata ##### -->
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<para>
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This function gets back user data pointers stored via
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g_object_set_qdata().
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</para>
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@object: The GObject to get a stored user data pointer from
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@quark: A #GQuark, naming the user data pointer
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@Returns: The user data pointer set, or %NULL
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<!-- ##### FUNCTION g_object_set_qdata ##### -->
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<para>
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This sets an opaque, named pointer on an object.
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The name is specified through a #GQuark (retrived e.g. via
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g_quark_from_static_string()), and the pointer
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can be gotten back from the @object with g_object_get_qdata()
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until the @object is finalized.
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Setting a previously set user data pointer, overrides (frees)
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the old pointer set, using #NULL as pointer essentially
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removes the data stored.
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</para>
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@object: The GObject to set store a user data pointer
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@quark: A #GQuark, naming the user data pointer
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@data: An opaque user data pointer
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<!-- ##### FUNCTION g_object_set_qdata_full ##### -->
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<para>
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This function works like g_object_set_qdata(), but in addition,
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a void (*destroy) (gpointer) function may be specified which is
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called with @data as argument when the @object is finalized, or
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the data is being overwritten by a call to g_object_set_qdata()
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|
with the same @quark.
|
|
</para>
|
|
|
|
@object: The GObject to set store a user data pointer
|
|
@quark: A #GQuark, naming the user data pointer
|
|
@data: An opaque user data pointer
|
|
@destroy: Function to invoke with @data as argument, when @data needs to be freed
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_steal_qdata ##### -->
|
|
<para>
|
|
This function gets back user data pointers stored via
|
|
g_object_set_qdata() and removes the @data from object
|
|
without invoking it's destroy() function (if any was
|
|
set).
|
|
Usually, calling this function is only required to update
|
|
user data pointers with a destroy notifier, for example:
|
|
<programlisting>
|
|
void
|
|
object_add_to_user_list (GObject *object,
|
|
const gchar *new_string)
|
|
{
|
|
/* the quark, naming the object data */
|
|
GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
|
|
/* retrive the old string list */
|
|
GList *list = g_object_steal_qdata (object, quark_string_list);
|
|
|
|
/* prepend new string */
|
|
list = g_list_prepend (list, g_strdup (new_string));
|
|
/* this changed 'list', so we need to set it again */
|
|
g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
|
|
}
|
|
static void
|
|
free_string_list (gpointer data)
|
|
{
|
|
GList *node, *list = data;
|
|
|
|
for (node = list; node; node = node->next)
|
|
g_free (node->data);
|
|
g_list_free (list);
|
|
}
|
|
</programlisting>
|
|
Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata()
|
|
would have left the destroy function set, and thus the partial string list would
|
|
have been freed upon g_object_set_qdata_full().
|
|
</para>
|
|
|
|
@object: The GObject to get a stored user data pointer from
|
|
@quark: A #GQuark, naming the user data pointer
|
|
@Returns: The user data pointer set, or %NULL
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_set_property ##### -->
|
|
<para>
|
|
Sets a property on an object.
|
|
</para>
|
|
|
|
@object: a #GObject
|
|
@property_name: the name of the property to set
|
|
@value: the value
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_get_property ##### -->
|
|
<para>
|
|
Gets a property of an object.
|
|
</para>
|
|
<para>
|
|
In general, a copy is made of the property contents and the caller is
|
|
responsible for freeing the memory in the appropriate manner for the type,
|
|
for instance by calling g_free() or g_object_unref().
|
|
</para>
|
|
<para>
|
|
See g_object_get().
|
|
</para>
|
|
|
|
@object: a #GObject
|
|
@property_name: the name of the property to get
|
|
@value: return location for the property value
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_new_valist ##### -->
|
|
<para>
|
|
Creates a new instance of a #GObject subtype and sets its properties.
|
|
</para>
|
|
<para>
|
|
Construction parameters (see #G_PARAM_CONSTRUCT, #G_PARAM_CONSTRUCT_ONLY)
|
|
which are not explicitly specified are set to their default values.
|
|
</para>
|
|
|
|
@object_type: the type id of the #GObject subtype to instantiate
|
|
@first_property_name: the name of the first property
|
|
@var_args: the value of the first property, followed optionally by more
|
|
name/value pairs, followed by %NULL
|
|
@Returns: a new instance of @object_type
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_set_valist ##### -->
|
|
<para>
|
|
Sets properties on an object.
|
|
</para>
|
|
|
|
@object: a #GObject
|
|
@first_property_name: name of the first property to set
|
|
@var_args: value for the first property, followed optionally by more
|
|
name/value pairs, followed by %NULL
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_get_valist ##### -->
|
|
<para>
|
|
Gets properties of an object.
|
|
</para>
|
|
<para>
|
|
In general, a copy is made of the property contents and the caller is
|
|
responsible for freeing the memory in the appropriate manner for the type,
|
|
for instance by calling g_free() or g_object_unref().
|
|
</para>
|
|
<para>
|
|
See g_object_get().
|
|
</para>
|
|
|
|
@object: a #GObject
|
|
@first_property_name: name of the first property to get
|
|
@var_args: return location for the first property, followed optionally by more
|
|
name/return location pairs, followed by %NULL
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_watch_closure ##### -->
|
|
<para>
|
|
This function essentially limits the life time of the @closure
|
|
to the life time of the object. That is, when the object is finalized,
|
|
the @closure is invalidated by calling g_closure_invalidate() on it,
|
|
in order to prevent invocations of the closure with a finalized (non
|
|
existing) object. Also, g_object_ref() and g_object_unref() are added
|
|
as marshal guards to the @closure, to ensure that an extra reference
|
|
count is held on @object during invocation of the @closure.
|
|
Usually, this function will be called on closures that use this @object
|
|
as closure data.
|
|
</para>
|
|
|
|
@object: GObject restricting lifetime of @closure
|
|
@closure: GClosure to watch
|
|
|
|
|
|
<!-- ##### FUNCTION g_object_run_dispose ##### -->
|
|
<para>
|
|
Releases all references to other objects. This can be used to break
|
|
reference cycles.
|
|
</para>
|
|
<note><para>
|
|
This functions should only be called from object system implementations.
|
|
</para></note>
|
|
|
|
@object: a #GObject
|
|
|
|
|
|
<!-- ##### MACRO G_OBJECT_WARN_INVALID_PROPERTY_ID ##### -->
|
|
<para>
|
|
This macros should be used to emit a standard warning about unexpected
|
|
properties in set_property() and get_property() implementations.
|
|
</para>
|
|
|
|
@object: the #GObject on which set_property() or get_property() was called
|
|
@property_id: the numeric id of the property
|
|
@pspec: the #GParamSpec of the property
|
|
|
|
|