Class (GI Class)

Gtk-4.0 ▶ Gtk ▶ TreeModelFilterDeprecated 4.10

A Gtk.TreeModel which hides parts of an underlying tree model

A Gtk.TreeModelFilter is a tree model which wraps another tree model, and can do the following things:

  • Filter specific rows, based on data from a “visible column”, a column storing booleans indicating whether the row should be filtered or not, or based on the return value of a “visible function”, which gets a model, iter and user_data and returns a boolean indicating whether the row should be filtered or not.

  • Modify the “appearance” of the model, using a modify function. This is extremely powerful and allows for just changing some values and also for creating a completely different model based on the given child model.

  • Set a different root node, also known as a “virtual root”. You can pass in a Gtk.TreePath indicating the root node for the filter at construction time.

The basic API is similar to Gtk.TreeModelSort. For an example on its usage, see the section on Gtk.TreeModelSort.

When using Gtk.TreeModelFilter, it is important to realize that Gtk.TreeModelFilter maintains an internal cache of all nodes which are visible in its clients. The cache is likely to be a subtree of the tree exposed by the child model. Gtk.TreeModelFilter will not cache the entire child model when unnecessary to not compromise the caching mechanism that is exposed by the reference counting scheme. If the child model implements reference counting, unnecessary signals may not be emitted because of reference counting rule 3, see the Gtk.TreeModel documentation. (Note that e.g. Gtk.TreeStore does not implement reference counting and will always emit all signals, even when the receiving node is not visible).

Because of this, limitations for possible visible functions do apply. In general, visible functions should only use data or properties from the node for which the visibility state must be determined, its siblings or its parents. Usually, having a dependency on the state of any child node is not possible, unless references are taken on these explicitly. When no such reference exists, no signals may be received for these child nodes (see reference counting rule number 3 in the Gtk.TreeModel section).

Determining the visibility state of a given node based on the state of its child nodes is a frequently occurring use case. Therefore, Gtk.TreeModelFilter explicitly supports this. For example, when a node does not have any children, you might not want the node to be visible. As soon as the first row is added to the node’s child level (or the last row removed), the node’s visibility should be updated.

This introduces a dependency from the node on its child nodes. In order to accommodate this, Gtk.TreeModelFilter must make sure the necessary signals are received from the child model. This is achieved by building, for all nodes which are exposed as visible nodes to Gtk.TreeModelFilter's clients, the child level (if any) and take a reference on the first node in this level. Furthermore, for every row-inserted, row-changed or row-deleted signal (also these which were not handled because the node was not cached), Gtk.TreeModelFilter will check if the visibility state of any parent node has changed.

Beware, however, that this explicit support is limited to these two cases. For example, if you want a node to be visible only if two nodes in a child’s child level (2 levels deeper) are visible, you are on your own. In this case, either rely on Gtk.TreeStore to emit all signals because it does not implement reference counting, or for models that do implement reference counting, obtain references on these child levels yourself.

since 4.10: Use Gtk.FilterListModel instead.

Hierarchy (View Summary)

Implements

Index

Constructors

constructor

Properties

$signals $gtype

Accessors

child_model childModel virtual_root virtualRoot

Methods

_init bind_property bind_property_full block_signal_handler clear_cache connect connect_after convert_child_iter_to_iter convert_child_path_to_path convert_iter_to_child_iter convert_path_to_child_path disconnect drag_data_delete drag_data_get emit filter_new force_floating foreach freeze_notify get_column_type get_data get_flags get_iter get_iter_first get_iter_from_string get_model get_n_columns get_path get_property get_qdata get_string_from_iter get_value getv is_floating iter_children iter_has_child iter_n_children iter_next iter_nth_child iter_parent iter_previous notify notify_by_pspec ref ref_node ref_sink refilter row_changed row_deleted row_draggable row_has_child_toggled row_inserted rows_reordered run_dispose set set_data set_modify_func set_property set_visible_column set_visible_func steal_data steal_qdata stop_emission_by_name thaw_notify unblock_signal_handler unref unref_node vfunc_constructed vfunc_dispatch_properties_changed vfunc_dispose vfunc_drag_data_delete vfunc_drag_data_get vfunc_finalize vfunc_get_column_type vfunc_get_flags vfunc_get_iter vfunc_get_n_columns vfunc_get_path vfunc_get_property vfunc_get_value vfunc_iter_children vfunc_iter_has_child vfunc_iter_n_children vfunc_iter_next vfunc_iter_nth_child vfunc_iter_parent vfunc_iter_previous vfunc_modify vfunc_notify vfunc_ref_node vfunc_row_changed vfunc_row_deleted vfunc_row_draggable vfunc_row_has_child_toggled vfunc_row_inserted vfunc_set_property vfunc_unref_node vfunc_visible watch_closure

Methods - Inherited from GObject

_classInit compat_control find_property install_properties install_property interface_find_property interface_install_property interface_list_properties list_properties newv override_property

Constructors

Properties

$signals: Gtk.TreeModelFilter.SignalSignatures

Compile-time signal type information.

This instance property is generated only for TypeScript type checking. It is not defined at runtime and should not be accessed in JS code.

$gtype: GType<Gtk.TreeModelFilter>

Accessors

Methods

Deprecated_init

  • 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.Object instance to be updated with the same value of the "active" property of the action GObject.Object instance.

    If flags contains GObject.BindingFlags.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 GObject.Binding 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.Object can have multiple bindings.

    Parameters

    Returns GObject.Binding

    the GObject.Binding instance representing the binding between the two GObject.Object instances. The binding is released whenever the GObject.Binding reference count reaches zero.

  • Complete version of g_object_bind_property().

    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.

    If flags contains GObject.BindingFlags.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 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 instances are finalized. This will release the reference that is being held on the GObject.Binding instance; if you want to hold on to the GObject.Binding instance, you will need to hold a reference to it.

    To remove the binding, call g_binding_unbind().

    A GObject.Object can have multiple bindings.

    The same user_data parameter will be used for both transform_to and transform_from transformation functions; the notify function will be called once, when the binding is removed. If you need different data for each transformation function, please use g_object_bind_property_with_closures() instead.

    Parameters

    • Deprecatedsource_property: string

      the property on source to bind

    • Deprecatedtarget: GObject.Object

      the target GObject.Object

    • Deprecatedtarget_property: string

      the property on target to bind

    • Deprecatedflags: GObject.BindingFlags

      flags to pass to GObject.Binding

    • OptionalDeprecatedtransform_to: BindingTransformFunc

      the transformation function from the source to the target, or null to use the default

    • OptionalDeprecatedtransform_from: BindingTransformFunc

      the transformation function from the target to the source, or null to use the default

    • OptionalDeprecatednotify: DestroyNotify

      a function to call when disposing the binding, to free resources used by the transformation functions, or null if not required

    Returns GObject.Binding

    the GObject.Binding instance representing the binding between the two GObject.Object instances. The binding is released whenever the GObject.Binding reference count reaches zero.

  • 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.

    Parameters

    • Deprecated...args: never[]

      the property on source to bind

    Returns any

    the GObject.Binding instance representing the binding between the two GObject.Object instances. The binding is released whenever the GObject.Binding reference count reaches zero.

  • This function should almost never be called. It clears the filter of any cached iterators that haven’t been reffed with gtk_tree_model_ref_node(). This might be useful if the child model being filtered is static (and doesn’t change often) and there has been a lot of unreffed access to nodes. As a side effect of this function, all unreffed iters will be invalid.

    Returns void

  • Sets filter_iter to point to the row in filter that corresponds to the row pointed at by child_iter. If filter_iter was not set, false is returned.

    Parameters

    Returns [boolean, Gtk.TreeIter]

    true, if filter_iter was set, i.e. if child_iter is a valid iterator pointing to a visible row in child model.

  • Converts child_path to a path relative to filter. That is, child_path points to a path in the child model. The rerturned path will point to the same row in the filtered model. If child_path isn’t a valid path on the child model or points to a row which is not visible in filter, then null is returned.

    Parameters

    Returns Gtk.TreePath

    A newly allocated Gtk.TreePath

  • Converts filter_path to a path on the child model of filter. That is, filter_path points to a location in filter. The returned path will point to the same location in the model not being filtered. If filter_path does not point to a location in the child model, null is returned.

    Parameters

    Returns Gtk.TreePath

    A newly allocated Gtk.TreePath

  • Disconnects a handler from an instance so it will not be called during any future or currently ongoing emissions of the signal it has been connected to.

    Parameters

    • Deprecatedid: number

      Handler ID of the handler to be disconnected

    Returns void

  • Asks the Gtk.TreeDragSource to delete the row at path, because it was moved somewhere else via drag-and-drop. Returns false if the deletion fails because path no longer exists, or for some model-specific reason. Should robustly handle a path no longer found in the model!

    Parameters

    • Deprecatedpath: Gtk.TreePath

      row that was being dragged

    Returns boolean

    true if the row was successfully deleted

  • 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.Object::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.

    Returns void

  • Gets a named field from the objects table of associations (see g_object_set_data()).

    Parameters

    • Deprecatedkey: string

      name of the key for that association

    Returns any

    the data if found, or null if no such data exists.

  • Gets a property of an object.

    The value can be:

    • an empty GObject.Value initialized by G_VALUE_INIT, which will be automatically initialized with the expected type of the property (since GLib 2.60)
    • a GObject.Value initialized with the expected type of the property
    • a GObject.Value initialized with a type to which the expected type of the property can be transformed

    In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling GObject.Value.unset.

    Note that GObject.Object.get_property is really intended for language bindings, GObject.Object.get is much more convenient for C programming.

    Parameters

    • Deprecatedproperty_name: string

      The name of the property to get

    • Deprecatedvalue: any

      Return location for the property value. Can be an empty GObject.Value initialized by G_VALUE_INIT (auto-initialized with expected type since GLib 2.60), a GObject.Value initialized with the expected property type, or a GObject.Value initialized with a transformable type

    Returns any

  • 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.

    Parameters

    • Deprecatednames: string[]

      the names of each property to get

    • Deprecatedvalues: any[]

      the values of each property to get

    Returns void

  • Sets iter to point to the first child of parent.

    If parent has no children, false is returned and iter is set to be invalid. parent will remain a valid node after this function has been called.

    If parent is null returns the first node, equivalent to gtk_tree_model_get_iter_first (tree_model, iter);

    Parameters

    Returns [boolean, Gtk.TreeIter]

    true, if iter has been set to the first child

  • Sets iter to be the child of parent, using the given index.

    The first index is 0. If n is too big, or parent has no children, iter is set to an invalid iterator and false is returned. parent will remain a valid node after this function has been called. As a special case, if parent is null, then the n-th root node is set.

    Parameters

    • Deprecatedparent: Gtk.TreeIter

      the Gtk.TreeIter to get the child from

    • Deprecatedn: number

      the index of the desired child

    Returns [boolean, Gtk.TreeIter]

    true, if parent has an n-th child

  • Sets iter to be the parent of child.

    If child is at the toplevel, and doesn’t have a parent, then iter is set to an invalid iterator and false is returned. child will remain a valid node after this function has been called.

    iter will be initialized before the lookup is performed, so child and iter cannot point to the same memory location.

    Parameters

    Returns [boolean, Gtk.TreeIter]

    true, if iter is set to the parent of child

  • 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.

    Parameters

    • Deprecatedproperty_name: string

      the name of a property installed on the class of object.

    Returns void

  • 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.:

      typedef enum
      {
        PROP_FOO = 1,
        PROP_LAST
      } MyObjectProperty;

      static GParamSpec *properties[PROP_LAST];

      static void
      my_object_class_init (MyObjectClass *klass)
      {
        properties[PROP_FOO] = g_param_spec_int ("foo", NULL, NULL,
                                                 0, 100,
                                                 50,
                                                 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
        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]);

    Parameters

    Returns void

  • Increases the reference count of object.

    Since GLib 2.56, if GLIB_VERSION_MAX_ALLOWED is 2.56 or greater, the type of object will be propagated to the return type (using the GCC typeof() extension), so any casting the caller needs to do on the return type must be explicit.

    Returns GObject.Object

    the same object

  • Lets the tree ref the node.

    This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons.

    This function is primarily meant as a way for views to let caching models know when nodes are being displayed (and hence, whether or not to cache that node). Being displayed means a node is in an expanded branch, regardless of whether the node is currently visible in the viewport. For example, a file-system based model would not want to keep the entire file-hierarchy in memory, just the sections that are currently being displayed by every current view.

    A model should be expected to be able to get an iter independent of its reffed state.

    Parameters

    Returns void

  • Increase the reference count of object, and possibly remove the floating 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().

    Returns GObject.Object

    object

  • Emits ::row_changed for each row in the child model, which causes the filter to re-evaluate whether a row is visible or not.

    Returns void

  • Emits the ::row-deleted signal on tree_model.

    See Gtk.TreeModel::row-deleted.

    This should be called by models after a row has been removed. The location pointed to by path should be the location that the row previously was at. It may not be a valid location anymore.

    Nodes that are deleted are not unreffed, this means that any outstanding references on the deleted node should not be released.

    Parameters

    Returns void

  • Emits the ::rows-reordered signal on tree_model.

    See Gtk.TreeModel::rows-reordered.

    This should be called by models when their rows have been reordered.

    Parameters

    • Deprecatedpath: Gtk.TreePath

      a Gtk.TreePath pointing to the tree node whose children have been reordered

    • Deprecatediter: Gtk.TreeIter

      a valid Gtk.TreeIter pointing to the node whose children have been reordered, or null if the depth of path is 0

    • Deprecatednew_order: number[]

      an array of integers mapping the current position of each child to its old position before the re-ordering, i.e. new_order``[newpos] = oldpos

    Returns void

  • Sets multiple properties of an object at once. The properties argument should be a dictionary mapping property names to values.

    Parameters

    • Deprecatedproperties: { [key: string]: any }

      Object containing the properties to set

    Returns void

  • 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 GLib.Quark 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 GLib.Quark storage growing unbounded.

    Parameters

    • Deprecatedkey: string

      name of the key

    • OptionalDeprecateddata: any

      data to associate with that key

    Returns void

  • With the n_columns and types parameters, you give an array of column types for this model (which will be exposed to the parent model/view). The func, data and destroy parameters are for specifying the modify function. The modify function will get called for each data access, the goal of the modify function is to return the data which should be displayed at the location specified using the parameters of the modify function.

    Note that gtk_tree_model_filter_set_modify_func() can only be called once for a given filter model.

    Parameters

    Returns void

  • Sets column of the child_model to be the column where filter should look for visibility information. columns should be a column of type G_TYPE_BOOLEAN, where true means that a row is visible, and false if not.

    Note that gtk_tree_model_filter_set_visible_func() or gtk_tree_model_filter_set_visible_column() can only be called once for a given filter model.

    Parameters

    • Deprecatedcolumn: number

      A int which is the column containing the visible information

    Returns void

  • Sets the visible function used when filtering the filter to be func. The function should return true if the given row should be visible and false otherwise.

    If the condition calculated by the function changes over time (e.g. because it depends on some global parameters), you must call gtk_tree_model_filter_refilter() to keep the visibility information of the model up-to-date.

    Note that func is called whenever a row is inserted, when it may still be empty. The visible function should therefore take special care of empty rows, like in the example below.

    static gboolean
    visible_func (GtkTreeModel *model,
                  GtkTreeIter  *iter,
                  gpointer      data)
    {
      // Visible if row is non-empty and first column is “HI”
      char *str;
      gboolean visible = FALSE;

      gtk_tree_model_get (model, iter, 0, &str, -1);
      if (str && strcmp (str, "HI") == 0)
        visible = TRUE;
      g_free (str);

      return visible;
    }

    Note that gtk_tree_model_filter_set_visible_func() or gtk_tree_model_filter_set_visible_column() can only be called once for a given filter model.

    Parameters

    Returns void

  • Remove a specified datum from the object's data associations, without invoking the association's destroy handler.

    Parameters

    • Deprecatedkey: string

      name of the key

    Returns any

    the data if found, or null if no such data exists.

  • 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().

    Parameters

    • Deprecatedquark: number

      A GLib.Quark, naming the user data pointer

    Returns any

    The user data pointer set, or null

  • 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.Object::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.

    Returns void

  • 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.Object 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.Object instance. Use g_clear_object() for this.

    Returns void

  • Lets the tree unref the node.

    This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons. For more information on what this means, see gtk_tree_model_ref_node().

    Please note that nodes that are deleted are not unreffed.

    Parameters

    Returns void

  • the constructed function is called by g_object_new() as the final step of the object creation process. At the point of the call, all construction properties have been set on the object. The purpose of this call is to allow for object initialisation steps that can only be performed after construction properties have been set. constructed implementors should chain up to the constructed call of their parent class to allow it to complete its initialisation.

    Returns void

  • the dispose function is supposed to drop all references to other objects, but keep the instance otherwise intact, so that client method invocations still work. It may be run multiple times (due to reference loops). Before returning, dispose should chain up to the dispose method of the parent class.

    Returns void

  • Sets iter to be the child of parent, using the given index.

    The first index is 0. If n is too big, or parent has no children, iter is set to an invalid iterator and false is returned. parent will remain a valid node after this function has been called. As a special case, if parent is null, then the n-th root node is set.

    Parameters

    • Deprecatedparent: Gtk.TreeIter

      the Gtk.TreeIter to get the child from

    • Deprecatedn: number

      the index of the desired child

    Returns [boolean, Gtk.TreeIter]

  • Sets iter to be the parent of child.

    If child is at the toplevel, and doesn’t have a parent, then iter is set to an invalid iterator and false is returned. child will remain a valid node after this function has been called.

    iter will be initialized before the lookup is performed, so child and iter cannot point to the same memory location.

    Parameters

    Returns [boolean, Gtk.TreeIter]

  • 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.

    Parameters

    Returns void

  • Lets the tree ref the node.

    This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons.

    This function is primarily meant as a way for views to let caching models know when nodes are being displayed (and hence, whether or not to cache that node). Being displayed means a node is in an expanded branch, regardless of whether the node is currently visible in the viewport. For example, a file-system based model would not want to keep the entire file-hierarchy in memory, just the sections that are currently being displayed by every current view.

    A model should be expected to be able to get an iter independent of its reffed state.

    Parameters

    Returns void

  • Emits the ::row-deleted signal on tree_model.

    See Gtk.TreeModel::row-deleted.

    This should be called by models after a row has been removed. The location pointed to by path should be the location that the row previously was at. It may not be a valid location anymore.

    Nodes that are deleted are not unreffed, this means that any outstanding references on the deleted node should not be released.

    Parameters

    Returns void

  • the generic setter for all properties of this type. Should be overridden for every type with properties. If implementations of set_property don't emit property change notification explicitly, this will be done implicitly by the type system. However, if the notify signal is emitted explicitly, the type system will not emit it a second time.

    Parameters

    • Deprecatedproperty_id: number
    • Deprecatedvalue: any
    • Deprecatedpspec: GObject.ParamSpec

    Returns void

  • Lets the tree unref the node.

    This is an optional method for models to implement. To be more specific, models may ignore this call as it exists primarily for performance reasons. For more information on what this means, see gtk_tree_model_ref_node().

    Please note that nodes that are deleted are not unreffed.

    Parameters

    Returns void

  • 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.

    Parameters

    Returns void

Methods - Inherited from GObject

StaticDeprecated_classInit

  • 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 GObject.ParamSpec, 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 GObject.TypeInfo.) 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.

    Parameters

    Returns void

  • Parameters

    • Deprecatedproperty_id: number

      the new property ID

    • Deprecatedname: string

      the name of a property registered in a parent class or in an interface of this class.

    Returns void

Interfaces

ConstructorProps
SignalSignatures