Optionalproperties: Partial<Gtk.IconTheme.ConstructorProps>Internal$signalsCompile-time signal type information.
This instance property is generated only for TypeScript type checking. It is not defined at runtime and should not be accessed in JS code.
Static$gtypeAdds a resource path that will be looked at when looking for icons, similar to search paths.
This function should be used to make application-specific icons available as part of the icon theme.
The resources are considered as part of the hicolor icon theme
and must be located in subdirectories that are defined in the
hicolor icon theme, such as ``path/16x16/actions/run.png.
Icons that are directly placed in the resource path instead
of a subdirectory are also considered as ultimate fallback.
a resource path
Appends a directory to the search path.
See gtk_icon_theme_set_search_path().
directory name to append to the icon path
Looks up a named icon and returns a Gtk.IconInfo containing
information such as the filename of the icon. The icon
can then be rendered into a pixbuf using
gtk_icon_info_load_icon(). (gtk_icon_theme_load_icon()
combines these two steps if all you need is the pixbuf.)
If icon_names contains more than one name, this function
tries them all in the given order before falling back to
inherited icon themes.
null-terminated array of icon names to lookup
desired icon size
flags modifying the behavior of the icon lookup
a Gtk.IconInfo object containing information about the icon, or null if the icon wasn’t found.
Looks up a named icon for a particular window scale and returns
a Gtk.IconInfo containing information such as the filename of the
icon. The icon can then be rendered into a pixbuf using
gtk_icon_info_load_icon(). (gtk_icon_theme_load_icon()
combines these two steps if all you need is the pixbuf.)
If icon_names contains more than one name, this function
tries them all in the given order before falling back to
inherited icon themes.
null-terminated array of icon names to lookup
desired icon size
desired scale
flags modifying the behavior of the icon lookup
a Gtk.IconInfo object containing information about the icon, or null if the icon wasn’t found.
SignalconnectSignalconnect_SignalemitGets the name of an icon that is representative of the current theme (for instance, to use when presenting a list of themes to the user.)
the name of an example icon or null. Free with g_free().
Returns an array of integers describing the sizes at which the icon is available without scaling. A size of -1 means that the icon is available in a scalable format. The array is zero-terminated.
the name of an icon
An newly allocated array describing the sizes at which the icon is available. The array should be freed with g_free() when it is no longer needed.
Gets the current search path. See gtk_icon_theme_set_search_path().
Checks whether an icon theme includes an icon for a particular name.
the name of an icon
true if icon_theme includes an icon for icon_name.
Gets the list of contexts available within the current
hierarchy of icon themes.
See gtk_icon_theme_list_icons() for details about contexts.
a GLib.List list holding the names of all the contexts in the theme. You must first free each element in the list with g_free(), then free the list itself with g_list_free().
Lists the icons in the current icon theme. Only a subset
of the icons can be listed by providing a context string.
The set of values for the context string is system dependent,
but will typically include such values as “Applications” and
“MimeTypes”. Contexts are explained in the
Icon Theme Specification.
The standard contexts are listed in the
Icon Naming Specification.
Also see gtk_icon_theme_list_contexts().
Optionalcontext: stringa string identifying a particular type of icon, or null to list all icons.
a GLib.List list holding the names of all the icons in the theme. You must first free each element in the list with g_free(), then free the list itself with g_list_free().
Looks up an icon in an icon theme, scales it to the given size
and renders it into a pixbuf. This is a convenience function;
if more details about the icon are needed, use
gtk_icon_theme_lookup_icon() followed by gtk_icon_info_load_icon().
Note that you probably want to listen for icon theme changes and
update the icon. This is usually done by connecting to the
GtkWidget::style-set signal. If for some reason you do not want to
update the icon when the icon theme changes, you should consider
using gdk_pixbuf_copy() to make a private copy of the pixbuf
returned by this function. Otherwise GTK+ may need to keep the old
icon theme loaded, which would be a waste of memory.
the name of the icon to lookup
the desired icon size. The resulting icon may not be exactly this size; see gtk_icon_info_load_icon().
flags modifying the behavior of the icon lookup
the rendered icon; this may be a newly created icon or a new reference to an internal icon, so you must not modify the icon. Use g_object_unref() to release your reference to the icon. null if the icon isn’t found.
Looks up an icon in an icon theme for a particular window scale,
scales it to the given size and renders it into a pixbuf. This is a
convenience function; if more details about the icon are needed,
use gtk_icon_theme_lookup_icon() followed by
gtk_icon_info_load_icon().
Note that you probably want to listen for icon theme changes and
update the icon. This is usually done by connecting to the
GtkWidget::style-set signal. If for some reason you do not want to
update the icon when the icon theme changes, you should consider
using gdk_pixbuf_copy() to make a private copy of the pixbuf
returned by this function. Otherwise GTK+ may need to keep the old
icon theme loaded, which would be a waste of memory.
the name of the icon to lookup
the desired icon size. The resulting icon may not be exactly this size; see gtk_icon_info_load_icon().
desired scale
flags modifying the behavior of the icon lookup
the rendered icon; this may be a newly created icon or a new reference to an internal icon, so you must not modify the icon. Use g_object_unref() to release your reference to the icon. null if the icon isn’t found.
Looks up an icon in an icon theme for a particular window scale,
scales it to the given size and renders it into a cairo surface. This is a
convenience function; if more details about the icon are needed,
use gtk_icon_theme_lookup_icon() followed by
gtk_icon_info_load_surface().
Note that you probably want to listen for icon theme changes and update the icon. This is usually done by connecting to the GtkWidget::style-set signal.
the name of the icon to lookup
the desired icon size. The resulting icon may not be exactly this size; see gtk_icon_info_load_icon().
desired scale
Gdk.Window to optimize drawing for, or null
flags modifying the behavior of the icon lookup
the rendered icon; this may be a newly created icon or a new reference to an internal icon, so you must not modify the icon. Use cairo_surface_destroy() to release your reference to the icon. null if the icon isn’t found.
Looks up an icon and returns a Gtk.IconInfo containing information
such as the filename of the icon. The icon can then be rendered
into a pixbuf using gtk_icon_info_load_icon().
When rendering on displays with high pixel densities you should not
use a size multiplied by the scaling factor returned by functions
like gdk_window_get_scale_factor(). Instead, you should use
gtk_icon_theme_lookup_by_gicon_for_scale(), as the assets loaded
for a given scaling factor may be different.
the Gio.Icon to look up
desired icon size
flags modifying the behavior of the icon lookup
a Gtk.IconInfo containing information about the icon, or null if the icon wasn’t found. Unref with g_object_unref()
Looks up an icon and returns a Gtk.IconInfo containing information
such as the filename of the icon. The icon can then be rendered into
a pixbuf using gtk_icon_info_load_icon().
the Gio.Icon to look up
desired icon size
the desired scale
flags modifying the behavior of the icon lookup
a Gtk.IconInfo containing information about the icon, or null if the icon wasn’t found. Unref with g_object_unref()
Looks up a named icon and returns a Gtk.IconInfo containing
information such as the filename of the icon. The icon
can then be rendered into a pixbuf using
gtk_icon_info_load_icon(). (gtk_icon_theme_load_icon()
combines these two steps if all you need is the pixbuf.)
When rendering on displays with high pixel densities you should not
use a size multiplied by the scaling factor returned by functions
like gdk_window_get_scale_factor(). Instead, you should use
gtk_icon_theme_lookup_icon_for_scale(), as the assets loaded
for a given scaling factor may be different.
the name of the icon to lookup
desired icon size
flags modifying the behavior of the icon lookup
a Gtk.IconInfo object containing information about the icon, or null if the icon wasn’t found.
Looks up a named icon for a particular window scale and returns a
Gtk.IconInfo containing information such as the filename of the
icon. The icon can then be rendered into a pixbuf using
gtk_icon_info_load_icon(). (gtk_icon_theme_load_icon() combines
these two steps if all you need is the pixbuf.)
the name of the icon to lookup
desired icon size
the desired scale
flags modifying the behavior of the icon lookup
a Gtk.IconInfo object containing information about the icon, or null if the icon wasn’t found.
Prepends a directory to the search path.
See gtk_icon_theme_set_search_path().
directory name to prepend to the icon path
Checks to see if the icon theme has changed; if it has, any
currently cached information is discarded and will be reloaded
next time icon_theme is accessed.
true if the icon theme has changed and needed to be reloaded.
Sets the name of the icon theme that the Gtk.IconTheme object uses
overriding system configuration. This function cannot be called
on the icon theme objects returned from gtk_icon_theme_get_default()
and gtk_icon_theme_get_for_screen().
Optionaltheme_name: stringname of icon theme to use instead of configured theme, or null to unset a previously set custom theme
Sets the search path for the icon theme object. When looking
for an icon theme, GTK+ will search for a subdirectory of
one or more of the directories in path with the same name
as the icon theme containing an index.theme file. (Themes from
multiple of the path elements are combined to allow themes to be
extended by adding icons in the user’s home directory.)
In addition if an icon found isn’t found either in the current
icon theme or the default icon theme, and an image file with
the right name is found directly in one of the elements of
path, then that image will be used for the icon name.
(This is legacy feature, and new icons should be put
into the fallback icon theme, which is called hicolor,
rather than directly on the icon path.)
array of directories that are searched for icon themes
Virtualvfunc_Signal emitted when the current icon theme is switched or GTK+ detects that a change has occurred in the contents of the current icon theme.
Staticadd_Registers a built-in icon for icon theme lookups. The idea of built-in icons is to allow an application or library that uses themed icons to function requiring files to be present in the file system. For instance, the default images for all of GTK+’s stock icons are registered as built-icons.
In general, if you use gtk_icon_theme_add_builtin_icon()
you should also install the icon in the icon theme, so
that the icon is generally available.
This function will generally be used with pixbufs loaded
via gdk_pixbuf_new_from_inline().
the name of the icon to register
the size in pixels at which to register the icon (different images can be registered for the same icon name at different sizes.)
GdkPixbuf.Pixbuf that contains the image to use for icon_name
Staticget_Staticget_Gets the icon theme object associated with screen; if this
function has not previously been called for the given
screen, a new icon theme object will be created and
associated with the screen. Icon theme objects are
fairly expensive to create, so using this function
is usually a better choice than calling than gtk_icon_theme_new()
and setting the screen yourself; by using this function
a single icon theme object will be shared between users.
StaticnewCreates 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.
the property on source to bind
the target GObject.Object
the property on target to bind
flags to pass to 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.
the property on source to bind
the target GObject.Object
the property on target to bind
flags to pass to GObject.Binding
Optionaltransform_to: BindingTransformFuncthe transformation function from the source to the target, or null to use the default
Optionaltransform_from: BindingTransformFuncthe transformation function from the target to the source, or null to use the default
Optionalnotify: DestroyNotifya function to call when disposing the binding, to free resources used by the transformation functions, or null if not required
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.
the property on source to bind
the target GObject.Object
the property on target to bind
flags to pass to GObject.Binding
a GObject.Closure wrapping the transformation function from the source to the target, or null to use the default
a GObject.Closure wrapping the transformation function from the target to the source, or null to use the default
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.
Blocks a handler of an instance so it will not be called during any signal emissions
Handler ID of the handler to be blocked
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.
Handler ID of the handler to be disconnected
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().
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.
Gets a named field from the objects table of associations (see g_object_set_data()).
name of the key for that association
the data if found, or null if no such data exists.
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 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.
The name of the property to get
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
This function gets back user data pointers stored via
g_object_set_qdata().
A GLib.Quark, naming the user data pointer
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.
the names of each property to get
the values of each property to get
Checks whether object has a [floating][floating-ref] reference.
true if object has a floating reference
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.:
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]);
the GObject.ParamSpec of a property installed on the class of object.
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.
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().
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.
Sets multiple properties of an object at once. The properties argument should be a dictionary mapping property names to values.
Object containing the properties to set
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.
name of the key
Optionaldata: anydata to associate with that key
Sets a property on an object.
The name of the property to set
The value to set the property to
Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
name of the key
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().
A GLib.Quark, naming the user data pointer
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.
Name of the signal to stop emission of
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.
Unblocks a handler so it will be called again during any signal emissions
Handler ID of the handler to be unblocked
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.
Virtualvfunc_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.
Virtualvfunc_Virtualvfunc_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.
Virtualvfunc_instance finalization function, should finish the finalization of
the instance begun in dispose and chain up to the finalize method of the
parent class.
Virtualvfunc_Virtualvfunc_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.
Virtualvfunc_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.
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.
GObject.Closure to watch
Static_Staticcompat_Optionaldata: anyStaticfind_Staticinstall_Staticinstall_the id for the new property
the GObject.ParamSpec for the new property
Staticinterface_Find the GObject.ParamSpec 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.
Staticinterface_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.
any interface vtable for the interface, or the default vtable for the interface.
the GObject.ParamSpec for the new property
Staticinterface_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
Staticlist_StaticnewvStaticoverride_the new property ID
the name of a property registered in a parent class or in an interface of this class.
Gtk.IconTheme provides a facility for looking up icons by name and size. The main reason for using a name rather than simply providing a filename is to allow different icons to be used depending on what “icon theme” is selected by the user. The operation of icon themes on Linux and Unix follows the Icon Theme Specification There is a fallback icon theme, named
hicolor, where applications should install their icons, but additional icon themes can be installed as operating system vendors and users choose.Named icons are similar to the deprecated [Stock Items][gtkstock], and the distinction between the two may be a bit confusing. A few things to keep in mind:
Stock images usually are used in conjunction with [Stock Items][gtkstock], such as
GTK_STOCK_OKorGTK_STOCK_OPEN. Named icons are easier to set up and therefore are more useful for new icons that an application wants to add, such as application icons or window icons.Stock images can only be loaded at the symbolic sizes defined by the Gtk.IconSize enumeration, or by custom sizes defined by
gtk_icon_size_register(), while named icons are more flexible and any pixel size can be specified.Because stock images are closely tied to stock items, and thus to actions in the user interface, stock images may come in multiple variants for different widget states or writing directions.
A good rule of thumb is that if there is a stock image for what you want to use, use it, otherwise use a named icon. It turns out that internally stock images are generally defined in terms of one or more named icons. (An example of the more than one case is icons that depend on writing direction;
GTK_STOCK_GO_FORWARDuses the two themed icons “gtk-stock-go-forward-ltr” and “gtk-stock-go-forward-rtl”.)In many cases, named themes are used indirectly, via Gtk.Image or stock items, rather than directly, but looking up icons directly is also simple. The Gtk.IconTheme object acts as a database of all the icons in the current theme. You can create new Gtk.IconTheme objects, but it’s much more efficient to use the standard icon theme for the Gdk.Screen so that the icon information is shared with other people looking up icons.