Creates a binding between source_property on source and target_property
on target.
Whenever the source_property is changed the target_property is
updated using the same value. For instance:
g_object_bind_property (action, "active", widget, "sensitive", 0);
Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.
If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual:
if target_property on target changes then the source_property on source
will be updated as well.
The binding will automatically be removed when either the source or the
target instances are finalized. To remove the binding without affecting the
source and the target you can just call g_object_unref() on the returned
#GBinding instance.
Removing the binding by calling g_object_unref() on it must only be done if
the binding, source and target are only used from a single thread and it
is clear that both source and target outlive the binding. Especially it
is not safe to rely on this if the binding, source or target can be
finalized from different threads. Keep another reference to the binding and
use g_binding_unbind() instead to be on the safe side.
A #GObject can have multiple bindings.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
Creates a binding between source_property on source and target_property
on target, allowing you to set the transformation functions to be used by
the binding.
This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
a #GClosure wrapping the transformation function from the source to the target, or %NULL to use the default
a #GClosure wrapping the transformation function from the target to the source, or %NULL to use the default
Checks if mount can be ejected.
Checks if mount can be unmounted.
Ejects a mount. This is an asynchronous operation, and is
finished by calling g_mount_eject_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the unmount if required for eject
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes ejecting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Ejects a mount. This is an asynchronous operation, and is
finished by calling g_mount_eject_with_operation_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the unmount if required for eject
a #GMountOperation or %NULL to avoid user interaction.
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes ejecting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
This function is intended for #GObject implementations to re-enforce a [floating][floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().
Increases the freeze count on object. If the freeze count is
non-zero, the emission of "notify" signals on object is
stopped. The signals are queued until the freeze count is decreased
to zero. Duplicate notifications are squashed so that at most one
#GObject::notify signal is emitted for each property modified while the
object is frozen.
This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.
Gets a named field from the objects table of associations (see g_object_set_data()).
name of the key for that association
Gets the name of mount.
Gets a property of an object.
The value can be:
In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().
Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.
the name of the property to get
return location for the property value
This function gets back user data pointers stored via g_object_set_qdata().
A #GQuark, naming the user data pointer
Gets the sort key for mount, if any.
Gets the UUID for the mount. The reference is typically based on
the file system UUID for the mount in question and should be
considered an opaque string. Returns %NULL if there is no UUID
available.
Gets the volume for the mount.
Gets n_properties properties for an object.
Obtained properties will be set to values. All properties must be valid.
Warnings will be emitted and undefined behaviour may result if invalid
properties are passed in.
the names of each property to get
the values of each property to get
Tries to guess the type of content stored on mount. Returns one or
more textual identifiers of well-known content types (typically
prefixed with "x-content/"), e.g. x-content/image-dcf for camera
memory cards. See the
shared-mime-info
specification for more on x-content types.
This is an asynchronous operation (see
g_mount_guess_content_type_sync() for the synchronous version), and
is finished by calling g_mount_guess_content_type_finish() with the
mount and #GAsyncResult data returned in the callback.
Whether to force a rescan of the content. Otherwise a cached result will be used if available
optional #GCancellable object, %NULL to ignore
a #GAsyncReadyCallback
Finishes guessing content types of mount. If any errors occurred
during the operation, error will be set to contain the errors and
%FALSE will be returned. In particular, you may get an
%G_IO_ERROR_NOT_SUPPORTED if the mount does not support content
guessing.
a #GAsyncResult
Tries to guess the type of content stored on mount. Returns one or
more textual identifiers of well-known content types (typically
prefixed with "x-content/"), e.g. x-content/image-dcf for camera
memory cards. See the
shared-mime-info
specification for more on x-content types.
This is a synchronous operation and as such may block doing IO; see g_mount_guess_content_type() for the asynchronous version.
Whether to force a rescan of the content. Otherwise a cached result will be used if available
optional #GCancellable object, %NULL to ignore
Checks whether object has a [floating][floating-ref] reference.
Determines if mount is shadowed. Applications or libraries should
avoid displaying mount in the user interface if it is shadowed.
A mount is said to be shadowed if there exists one or more user
visible objects (currently #GMount objects) with a root that is
inside the root of mount.
One application of shadow mounts is when exposing a single file
system that is used to address several logical volumes. In this
situation, a #GVolumeMonitor implementation would create two
#GVolume objects (for example, one for the camera functionality of
the device and one for a SD card reader on the device) with
activation URIs gphoto2://[usb:001,002]/store1/
and gphoto2://[usb:001,002]/store2/. When the
underlying mount (with root
gphoto2://[usb:001,002]/) is mounted, said
#GVolumeMonitor implementation would create two #GMount objects
(each with their root matching the corresponding volume activation
root) that would shadow the original mount.
The proxy monitor in GVfs 2.26 and later, automatically creates and manage shadow mounts (and shadows the underlying mount) if the activation root on a #GVolume is set.
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
the name of a property installed on the class of object.
Emits a "notify" signal for the property specified by pspec on object.
This function omits the property name lookup, hence it is faster than g_object_notify().
One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:
enum
{
PROP_0,
PROP_FOO,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void
my_object_class_init (MyObjectClass *klass)
{
properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
0, 100,
50,
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
PROP_FOO,
properties[PROP_FOO]);
}
and then notify a change on the "foo" property with:
g_object_notify_by_pspec (self, properties[PROP_FOO]);
the #GParamSpec of a property installed on the class of object.
Increase the reference count of object, and possibly remove the
[floating][floating-ref] reference, if object has a floating reference.
In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.
Since GLib 2.56, the type of object will be propagated to the return type
under the same conditions as for g_object_ref().
Remounts a mount. This is an asynchronous operation, and is
finished by calling g_mount_remount_finish() with the mount
and #GAsyncResults data returned in the callback.
Remounting is useful when some setting affecting the operation of the volume has been changed, as these may need a remount to take affect. While this is semantically equivalent with unmounting and then remounting not all backends might need to actually be unmounted.
flags affecting the operation
a #GMountOperation or %NULL to avoid user interaction.
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes remounting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Releases all references to other objects. This can be used to break reference cycles.
This function should only be called from object system implementations.
Each object carries around a table of associations from strings to pointers. This function lets you set an association.
If the object already had an association with that name, the old association will be destroyed.
Internally, the key is converted to a #GQuark using g_quark_from_string().
This means a copy of key is kept permanently (even after object has been
finalized) — so it is recommended to only use a small, bounded set of values
for key in your program, to avoid the #GQuark storage growing unbounded.
name of the key
data to associate with that key
Sets a property on an object.
the name of the property to set
the value
Increments the shadow count on mount. Usually used by
#GVolumeMonitor implementations when creating a shadow mount for
mount, see g_mount_is_shadowed() for more information. The caller
will need to emit the #GMount::changed signal on mount manually.
Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
name of the key
This function gets back user data pointers stored via
g_object_set_qdata() and removes the data from object
without invoking its destroy() function (if any was
set).
Usually, calling this function is only required to update
user data pointers with a destroy notifier, for example:
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");
// retrieve 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);
}
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().
A #GQuark, naming the user data pointer
Reverts the effect of a previous call to
g_object_freeze_notify(). The freeze count is decreased on object
and when it reaches zero, queued "notify" signals are emitted.
Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.
It is an error to call this function when the freeze count is zero.
Unmounts a mount. This is an asynchronous operation, and is
finished by calling g_mount_unmount_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the operation
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes unmounting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Unmounts a mount. This is an asynchronous operation, and is
finished by calling g_mount_unmount_with_operation_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the operation
a #GMountOperation or %NULL to avoid user interaction.
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes unmounting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Decreases the reference count of object. When its reference count
drops to 0, the object is finalized (i.e. its memory is freed).
If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.
Decrements the shadow count on mount. Usually used by
#GVolumeMonitor implementations when destroying a shadow mount for
mount, see g_mount_is_shadowed() for more information. The caller
will need to emit the #GMount::changed signal on mount manually.
Checks if mount can be ejected.
Checks if mount can be unmounted.
Ejects a mount. This is an asynchronous operation, and is
finished by calling g_mount_eject_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the unmount if required for eject
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes ejecting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Ejects a mount. This is an asynchronous operation, and is
finished by calling g_mount_eject_with_operation_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the unmount if required for eject
a #GMountOperation or %NULL to avoid user interaction.
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes ejecting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Gets the name of mount.
Gets the sort key for mount, if any.
Gets the UUID for the mount. The reference is typically based on
the file system UUID for the mount in question and should be
considered an opaque string. Returns %NULL if there is no UUID
available.
Gets the volume for the mount.
Tries to guess the type of content stored on mount. Returns one or
more textual identifiers of well-known content types (typically
prefixed with "x-content/"), e.g. x-content/image-dcf for camera
memory cards. See the
shared-mime-info
specification for more on x-content types.
This is an asynchronous operation (see
g_mount_guess_content_type_sync() for the synchronous version), and
is finished by calling g_mount_guess_content_type_finish() with the
mount and #GAsyncResult data returned in the callback.
Whether to force a rescan of the content. Otherwise a cached result will be used if available
optional #GCancellable object, %NULL to ignore
a #GAsyncReadyCallback
Finishes guessing content types of mount. If any errors occurred
during the operation, error will be set to contain the errors and
%FALSE will be returned. In particular, you may get an
%G_IO_ERROR_NOT_SUPPORTED if the mount does not support content
guessing.
a #GAsyncResult
Tries to guess the type of content stored on mount. Returns one or
more textual identifiers of well-known content types (typically
prefixed with "x-content/"), e.g. x-content/image-dcf for camera
memory cards. See the
shared-mime-info
specification for more on x-content types.
This is a synchronous operation and as such may block doing IO; see g_mount_guess_content_type() for the asynchronous version.
Whether to force a rescan of the content. Otherwise a cached result will be used if available
optional #GCancellable object, %NULL to ignore
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
Remounts a mount. This is an asynchronous operation, and is
finished by calling g_mount_remount_finish() with the mount
and #GAsyncResults data returned in the callback.
Remounting is useful when some setting affecting the operation of the volume has been changed, as these may need a remount to take affect. While this is semantically equivalent with unmounting and then remounting not all backends might need to actually be unmounted.
flags affecting the operation
a #GMountOperation or %NULL to avoid user interaction.
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes remounting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Unmounts a mount. This is an asynchronous operation, and is
finished by calling g_mount_unmount_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the operation
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes unmounting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
Unmounts a mount. This is an asynchronous operation, and is
finished by calling g_mount_unmount_with_operation_finish() with the mount
and #GAsyncResult data returned in the callback.
flags affecting the operation
a #GMountOperation or %NULL to avoid user interaction.
optional #GCancellable object, %NULL to ignore.
a #GAsyncReadyCallback, or %NULL.
Finishes unmounting a mount. If any errors occurred during the operation,
error will be set to contain the errors and %FALSE will be returned.
a #GAsyncResult.
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
(nonexisting) 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.
#GClosure to watch
Find the #GParamSpec with the given name for an
interface. Generally, the interface vtable passed in as g_iface
will be the default vtable from g_type_default_interface_ref(), or,
if you know the interface has already been loaded,
g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
name of a property to look up.
Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.
This function is meant to be called from the interface's default
vtable initialization function (the class_init member of
#GTypeInfo.) It must not be called after after class_init has
been called for any object types implementing this interface.
If pspec is a floating reference, it will be consumed.
any interface vtable for the interface, or the default vtable for the interface.
the #GParamSpec for the new property
Lists the properties of an interface.Generally, the interface
vtable passed in as g_iface will be the default vtable from
g_type_default_interface_ref(), or, if you know the interface has
already been loaded, g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
Creates a new instance of a #GObject subtype and sets its properties.
Construction parameters (see %G_PARAM_CONSTRUCT, %G_PARAM_CONSTRUCT_ONLY) which are not explicitly specified are set to their default values.
the type id of the #GObject subtype to instantiate
an array of #GParameter
The #GMount interface represents user-visible mounts. Note, when porting from GnomeVFS, #GMount is the moral equivalent of #GnomeVFSVolume.
#GMount is a "mounted" filesystem that you can access. Mounted is in quotes because it's not the same as a unix mount, it might be a gvfs mount, but you can still access the files on it if you use GIO. Might or might not be related to a volume object.
Unmounting a #GMount instance is an asynchronous operation. For more information about asynchronous operations, see #GAsyncResult and #GTask. To unmount a #GMount instance, first call g_mount_unmount_with_operation() with (at least) the #GMount instance and a #GAsyncReadyCallback. The callback will be fired when the operation has resolved (either with success or failure), and a #GAsyncResult structure will be passed to the callback. That callback should then call g_mount_unmount_with_operation_finish() with the #GMount and the #GAsyncResult data to see if the operation was completed successfully. If an
erroris present when g_mount_unmount_with_operation_finish() is called, then it will be filled with any error information.