Interface (GI Interface)

Gtk-4.0 ▶ Gtk ▶ TreeModelDeprecated 4.10

The tree interface used by GtkTreeView

The Gtk.TreeModel interface defines a generic tree interface for use by the Gtk.TreeView widget. It is an abstract interface, and is designed to be usable with any appropriate data structure. The programmer just has to implement this interface on their own data type for it to be viewable by a Gtk.TreeView widget.

The model is represented as a hierarchical tree of strongly-typed, columned data. In other words, the model can be seen as a tree where every node has different values depending on which column is being queried. The type of data found in a column is determined by using the GType system (ie. G_TYPE_INT, GTK_TYPE_BUTTON, G_TYPE_POINTER, etc). The types are homogeneous per column across all nodes. It is important to note that this interface only provides a way of examining a model and observing changes. The implementation of each individual model decides how and if changes are made.

In order to make life simpler for programmers who do not need to write their own specialized model, two generic models are provided — the Gtk.TreeStore and the Gtk.ListStore. To use these, the developer simply pushes data into these models as necessary. These models provide the data structure as well as all appropriate tree interfaces. As a result, implementing drag and drop, sorting, and storing data is trivial. For the vast majority of trees and lists, these two models are sufficient.

Models are accessed on a node/column level of granularity. One can query for the value of a model at a certain node and a certain column on that node. There are two structures used to reference a particular node in a model. They are the Gtk.TreePath and the Gtk.TreeIter (“iter” is short for iterator). Most of the interface consists of operations on a Gtk.TreeIter.

A path is essentially a potential node. It is a location on a model that may or may not actually correspond to a node on a specific model. A Gtk.TreePath can be converted into either an array of unsigned integers or a string. The string form is a list of numbers separated by a colon. Each number refers to the offset at that level. Thus, the path 0 refers to the root node and the path 2:4 refers to the fifth child of the third node.

By contrast, a Gtk.TreeIter is a reference to a specific node on a specific model. It is a generic struct with an integer and three generic pointers. These are filled in by the model in a model-specific way. One can convert a path to an iterator by calling gtk_tree_model_get_iter(). These iterators are the primary way of accessing a model and are similar to the iterators used by Gtk.TextBuffer. They are generally statically allocated on the stack and only used for a short time. The model interface defines a set of operations using them for navigating the model.

It is expected that models fill in the iterator with private data. For example, the Gtk.ListStore model, which is internally a simple linked list, stores a list node in one of the pointers. The Gtk.TreeModelSort stores an array and an offset in two of the pointers. Additionally, there is an integer field. This field is generally filled with a unique stamp per model. This stamp is for catching errors resulting from using invalid iterators with a model.

The lifecycle of an iterator can be a little confusing at first. Iterators are expected to always be valid for as long as the model is unchanged (and doesn’t emit a signal). The model is considered to own all outstanding iterators and nothing needs to be done to free them from the user’s point of view. Additionally, some models guarantee that an iterator is valid for as long as the node it refers to is valid (most notably the Gtk.TreeStore and Gtk.ListStore). Although generally uninteresting, as one always has to allow for the case where iterators do not persist beyond a signal, some very important performance enhancements were made in the sort model. As a result, the Gtk.TreeModelFlags.ITERS_PERSIST flag was added to indicate this behavior.

To help show some common operation of a model, some examples are provided. The first example shows three ways of getting the iter at the location 3:2:5. While the first method shown is easier, the second is much more common, as you often get paths from callbacks.

// Three ways of getting the iter pointing to the location
GtkTreePath *path;
GtkTreeIter iter;
GtkTreeIter parent_iter;

// get the iterator from a string
gtk_tree_model_get_iter_from_string (model,
                                     &iter,
                                     "3:2:5");

// get the iterator from a path
path = gtk_tree_path_new_from_string ("3:2:5");
gtk_tree_model_get_iter (model, &iter, path);
gtk_tree_path_free (path);

// walk the tree to find the iterator
gtk_tree_model_iter_nth_child (model, &iter,
                               NULL, 3);
parent_iter = iter;
gtk_tree_model_iter_nth_child (model, &iter,
                               &parent_iter, 2);
parent_iter = iter;
gtk_tree_model_iter_nth_child (model, &iter,
                               &parent_iter, 5);

This second example shows a quick way of iterating through a list and getting a string and an integer from each row. The populate_model() function used below is not shown, as it is specific to the Gtk.ListStore. For information on how to write such a function, see the Gtk.ListStore documentation.

enum
{
  STRING_COLUMN,
  INT_COLUMN,
  N_COLUMNS
};

...

GtkTreeModel *list_store;
GtkTreeIter iter;
gboolean valid;
int row_count = 0;

// make a new list_store
list_store = gtk_list_store_new (N_COLUMNS,
                                 G_TYPE_STRING,
                                 G_TYPE_INT);

// Fill the list store with data
populate_model (list_store);

// Get the first iter in the list, check it is valid and walk
// through the list, reading each row.

valid = gtk_tree_model_get_iter_first (list_store,
                                       &iter);
while (valid)
 {
   char *str_data;
   int    int_data;

   // Make sure you terminate calls to `gtk_tree_model_get()` with a “-1” value
   gtk_tree_model_get (list_store, &iter,
                       STRING_COLUMN, &str_data,
                       INT_COLUMN, &int_data,
                       -1);

   // Do something with the data
   g_print ("Row %d: (%s,%d)\n",
            row_count, str_data, int_data);
   g_free (str_data);

   valid = gtk_tree_model_iter_next (list_store,
                                     &iter);
   row_count++;
 }

The Gtk.TreeModel interface contains two methods for reference counting: gtk_tree_model_ref_node() and gtk_tree_model_unref_node(). These two methods are optional to implement. The reference counting is meant as a way for views to let models know when nodes are being displayed. Gtk.TreeView will take a reference on a node when it is visible, which means the node is either in the toplevel or expanded. Being displayed does not mean that the node is currently directly visible to the user in the viewport. Based on this reference counting scheme a caching model, for example, can decide whether or not to cache a node based on the reference count. A file-system based model would not want to keep the entire file hierarchy in memory, but just the folders that are currently expanded in every current view.

When working with reference counting, the following rules must be taken into account:

  • Never take a reference on a node without owning a reference on its parent. This means that all parent nodes of a referenced node must be referenced as well.

  • Outstanding references on a deleted node are not released. This is not possible because the node has already been deleted by the time the row-deleted signal is received.

  • Models are not obligated to emit a signal on rows of which none of its siblings are referenced. To phrase this differently, signals are only required for levels in which nodes are referenced. For the root level however, signals must be emitted at all times (however the root level is always referenced when any view is attached).

since 4.10: Use Gio.ListModel instead

interface TreeModel {
    $signals: GObject.Object.SignalSignatures;
    _init(...args: any[]): void;
    bind_property(
        source_property: string,
        target: GObject.Object,
        target_property: string,
        flags: GObject.BindingFlags,
    ): GObject.Binding;
    bind_property_full(
        source_property: string,
        target: GObject.Object,
        target_property: string,
        flags: GObject.BindingFlags,
        transform_to?: BindingTransformFunc,
        transform_from?: BindingTransformFunc,
        notify?: DestroyNotify,
    ): GObject.Binding;
    bind_property_full(
        source_property: string,
        target: GObject.Object,
        target_property: string,
        flags: GObject.BindingFlags,
        transform_to: Closure<any, any>,
        transform_from: Closure<any, any>,
    ): GObject.Binding;
    block_signal_handler(id: number): void;
    connect<K extends "notify">(
        signal: K,
        callback: SignalCallback<
            Gtk.TreeModel,
            GObject.Object.SignalSignatures[K],
        >,
    ): number;
    connect(signal: string, callback: (...args: any[]) => any): number;
    connect_after<K extends "notify">(
        signal: K,
        callback: SignalCallback<
            Gtk.TreeModel,
            GObject.Object.SignalSignatures[K],
        >,
    ): number;
    connect_after(signal: string, callback: (...args: any[]) => any): number;
    disconnect(id: number): void;
    emit<K extends "notify">(
        signal: K,
        ...args: GjsParameters<GObject.Object.SignalSignatures[K]> extends [
            any,
            ...Q[],
        ]
            ? Q
            : never,
    ): void;
    emit(signal: string, ...args: any[]): void;
    filter_new(root?: Gtk.TreePath): Gtk.TreeModel;
    force_floating(): void;
    foreach(func: Gtk.TreeModelForeachFunc): void;
    freeze_notify(): void;
    get_column_type(index_: number): GType;
    get_data(key: string): any;
    get_flags(): Gtk.TreeModelFlags;
    get_iter(path: Gtk.TreePath): [boolean, Gtk.TreeIter];
    get_iter_first(): [boolean, Gtk.TreeIter];
    get_iter_from_string(path_string: string): [boolean, Gtk.TreeIter];
    get_n_columns(): number;
    get_path(iter: Gtk.TreeIter): Gtk.TreePath;
    get_property(property_name: string, value: any): any;
    get_qdata(quark: number): any;
    get_string_from_iter(iter: Gtk.TreeIter): string;
    get_value(iter: Gtk.TreeIter, column: number): unknown;
    getv(names: string[], values: any[]): void;
    is_floating(): boolean;
    iter_children(parent?: Gtk.TreeIter): [boolean, Gtk.TreeIter];
    iter_has_child(iter: Gtk.TreeIter): boolean;
    iter_n_children(iter?: Gtk.TreeIter): number;
    iter_next(iter: Gtk.TreeIter): boolean;
    iter_nth_child(parent: Gtk.TreeIter, n: number): [boolean, Gtk.TreeIter];
    iter_parent(child: Gtk.TreeIter): [boolean, Gtk.TreeIter];
    iter_previous(iter: Gtk.TreeIter): boolean;
    notify(property_name: string): void;
    notify_by_pspec(pspec: GObject.ParamSpec): void;
    ref(): GObject.Object;
    ref_node(iter: Gtk.TreeIter): void;
    ref_sink(): GObject.Object;
    row_changed(path: Gtk.TreePath, iter: Gtk.TreeIter): void;
    row_deleted(path: Gtk.TreePath): void;
    row_has_child_toggled(path: Gtk.TreePath, iter: Gtk.TreeIter): void;
    row_inserted(path: Gtk.TreePath, iter: Gtk.TreeIter): void;
    rows_reordered(
        path: Gtk.TreePath,
        iter: Gtk.TreeIter,
        new_order: number[],
    ): void;
    run_dispose(): void;
    set(properties: { [key: string]: any }): void;
    set_data(key: string, data?: any): void;
    set_property(property_name: string, value: any): void;
    steal_data(key: string): any;
    steal_qdata(quark: number): any;
    stop_emission_by_name(detailedName: string): void;
    thaw_notify(): void;
    unblock_signal_handler(id: number): void;
    unref(): void;
    unref_node(iter: Gtk.TreeIter): void;
    vfunc_constructed(): void;
    vfunc_dispatch_properties_changed(
        n_pspecs: number,
        pspecs: GObject.ParamSpec,
    ): void;
    vfunc_dispose(): void;
    vfunc_finalize(): void;
    vfunc_get_column_type(index_: number): GType;
    vfunc_get_flags(): Gtk.TreeModelFlags;
    vfunc_get_iter(path: Gtk.TreePath): [boolean, Gtk.TreeIter];
    vfunc_get_n_columns(): number;
    vfunc_get_path(iter: Gtk.TreeIter): Gtk.TreePath;
    vfunc_get_property(
        property_id: number,
        value: any,
        pspec: GObject.ParamSpec,
    ): void;
    vfunc_get_value(iter: Gtk.TreeIter, column: number): unknown;
    vfunc_iter_children(parent?: Gtk.TreeIter): [boolean, Gtk.TreeIter];
    vfunc_iter_has_child(iter: Gtk.TreeIter): boolean;
    vfunc_iter_n_children(iter?: Gtk.TreeIter): number;
    vfunc_iter_next(iter: Gtk.TreeIter): boolean;
    vfunc_iter_nth_child(
        parent: Gtk.TreeIter,
        n: number,
    ): [boolean, Gtk.TreeIter];
    vfunc_iter_parent(child: Gtk.TreeIter): [boolean, Gtk.TreeIter];
    vfunc_iter_previous(iter: Gtk.TreeIter): boolean;
    vfunc_notify(pspec: GObject.ParamSpec): void;
    vfunc_ref_node(iter: Gtk.TreeIter): void;
    vfunc_row_changed(path: Gtk.TreePath, iter: Gtk.TreeIter): void;
    vfunc_row_deleted(path: Gtk.TreePath): void;
    vfunc_row_has_child_toggled(path: Gtk.TreePath, iter: Gtk.TreeIter): void;
    vfunc_row_inserted(path: Gtk.TreePath, iter: Gtk.TreeIter): void;
    vfunc_set_property(
        property_id: number,
        value: any,
        pspec: GObject.ParamSpec,
    ): void;
    vfunc_unref_node(iter: Gtk.TreeIter): void;
    watch_closure(closure: Closure): void;
}

Hierarchy (View Summary)

Implemented by

Index

Properties - Inherited from GObject

$signals

Methods

filter_new foreach get_column_type get_flags get_iter get_iter_first get_iter_from_string get_n_columns get_path get_string_from_iter get_value iter_children iter_has_child iter_n_children iter_next iter_nth_child iter_parent iter_previous ref_node row_changed row_deleted row_has_child_toggled row_inserted rows_reordered unref_node

Methods - Inherited from GObject

_init bind_property bind_property_full block_signal_handler connect connect_after disconnect emit force_floating freeze_notify get_data get_property get_qdata getv is_floating notify notify_by_pspec ref ref_sink run_dispose set set_data set_property steal_data steal_qdata stop_emission_by_name thaw_notify unblock_signal_handler unref vfunc_constructed vfunc_dispatch_properties_changed vfunc_dispose vfunc_finalize vfunc_get_property vfunc_notify vfunc_set_property watch_closure

Methods - Inherited from Gtk.TreeModel.Interface

vfunc_get_column_type vfunc_get_flags vfunc_get_iter vfunc_get_n_columns vfunc_get_path 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_ref_node vfunc_row_changed vfunc_row_deleted vfunc_row_has_child_toggled vfunc_row_inserted vfunc_unref_node

Properties - Inherited from GObject

$signals: GObject.Object.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.

Methods

  • Returns the type of the column.

    Parameters

    • Deprecatedindex_: number

      the column index

    Returns GType

    the type of the column

  • Initializes iter with the first iterator in the tree (the one at the path "0").

    Returns false if the tree is empty, true otherwise.

    Returns [boolean, Gtk.TreeIter]

    true, if iter was set

  • Sets iter to a valid iterator pointing to path_string, if it exists.

    Otherwise, iter is left invalid and false is returned.

    Parameters

    • Deprecatedpath_string: string

      a string representation of a Gtk.TreePath

    Returns [boolean, Gtk.TreeIter]

    true, if iter was set

  • Returns the number of columns supported by tree_model.

    Returns number

    the number of columns

  • Generates a string representation of the iter.

    This string is a “:” separated list of numbers. For example, “4:10:0:3” would be an acceptable return value for this string.

    Parameters

    Returns string

    a newly-allocated string

  • Initializes and sets value to that at column.

    When done with value, g_value_unset() needs to be called to free any allocated memory.

    Parameters

    Returns unknown

  • 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

  • Returns the number of children that iter has.

    As a special case, if iter is null, then the number of toplevel nodes is returned.

    Parameters

    Returns number

    the number of children of iter

  • Sets iter to point to the node following it at the current level.

    If there is no next iter, false is returned and iter is set to be invalid.

    Parameters

    Returns boolean

    true if iter has been changed to the next node

  • 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

  • Sets iter to point to the previous node at the current level.

    If there is no previous iter, false is returned and iter is set to be invalid.

    Parameters

    Returns boolean

    true if iter has been changed to the previous node

  • 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

  • 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

  • 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

Methods - Inherited from GObject

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

    • 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

    • Deprecatedtransform_to: Closure<any, any>

      a GObject.Closure wrapping the transformation function from the source to the target, or null to use the default

    • Deprecatedtransform_from: Closure<any, any>

      a GObject.Closure wrapping the transformation function from the target to the source, or null to use the default

    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.

  • 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

  • This function is intended for GObject.Object 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().

    Returns void

  • 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

  • This function gets back user data pointers stored via g_object_set_qdata().

    Parameters

    • Deprecatedquark: number

      A GLib.Quark, naming the user data pointer

    Returns any

    The user data pointer set, or null

  • 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

  • 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

  • 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().

    Returns GObject.Object

    object

  • Releases all references to other objects. This can be used to break reference cycles.

    This function should only be called from object system implementations.

    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

  • Sets a property on an object.

    Parameters

    • Deprecatedproperty_name: string

      The name of the property to set

    • Deprecatedvalue: any

      The value to set the property to

    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

  • Stops a signal's emission by the given signal name. This will prevent the default handler and any subsequent signal handlers from being invoked.

    Parameters

    • DeprecateddetailedName: string

      Name of the signal to stop emission of

    Returns void

  • 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

  • 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

  • instance finalization function, should finish the finalization of the instance begun in dispose and chain up to the finalize method of the parent class.

    Returns void

  • 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

  • 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

  • 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 Gtk.TreeModel.Interface

  • 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]

  • 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

  • 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

Interfaces

ConstructorProps
Interface