Gtk.CssProvider

Subclasses:

None

Methods

Inherited:

GObject.Object (37)

Structs:

GObject.ObjectClass (5)

class	new ()
	load_from_bytes (data)
	load_from_data (data, length)
	load_from_file (file)
	load_from_path (path)
	load_from_resource (resource_path)
	load_from_string (string)
	load_named (name, variant)
	to_string ()

Virtual Methods

Inherited:

GObject.Object (7)

Properties

None

Signals

Inherited:

GObject.Object (1), Gtk.StyleProvider (1)

Name	Short Description
parsing-error	Signals that a parsing error occurred.

Fields

Inherited:

GObject.Object (1), Gtk.StyleProvider (1)

Name	Type	Access	Description
parent_instance	GObject.Object	r

Class Details

class Gtk.CssProvider(**kwargs)

Bases:

GObject.Object, Gtk.StyleProvider

Abstract:

No

Structure:

Gtk.CssProviderClass

GtkCssProvider is an object implementing the GtkStyleProvider interface for CSS.

It is able to parse CSS-like input in order to style widgets.

An application can make GTK parse a specific CSS style sheet by calling [method`Gtk`.CssProvider.load_from_file] or [method`Gtk`.CssProvider.load_from_resource] and adding the provider with [method`Gtk`.StyleContext.add_provider] or [func`Gtk`.StyleContext.add_provider_for_display].

In addition, certain files will be read when GTK is initialized. First, the file $XDG_CONFIG_HOME/gtk-4.0/gtk.css is loaded if it exists. Then, GTK loads the first existing file among XDG_DATA_HOME/themes/THEME/gtk-VERSION/gtk-VARIANT.css, $HOME/.themes/THEME/gtk-VERSION/gtk-VARIANT.css, $XDG_DATA_DIRS/themes/THEME/gtk-VERSION/gtk-VARIANT.css and DATADIR/share/themes/THEME/gtk-VERSION/gtk-VARIANT.css, where THEME is the name of the current theme (see the [property`Gtk`.Settings:gtk-theme-name] setting), VARIANT is the variant to load (see the [property`Gtk`.Settings:gtk-application-prefer-dark-theme] setting), DATADIR is the prefix configured when GTK was compiled (unless overridden by the GTK_DATA_PREFIX environment variable), and VERSION is the GTK version number. If no file is found for the current version, GTK tries older versions all the way back to 4.0.

To track errors while loading CSS, connect to the [signal`Gtk`.CssProvider::parsing-error] signal.

classmethod new()

Returns:

A new GtkCssProvider

Return type:

Gtk.CssProvider

Returns a newly created GtkCssProvider.

load_from_bytes(data)

Parameters:

data (GLib.Bytes) – GBytes containing the data to load

Loads data into self.

This clears any previously loaded information.

New in version 4.12.

load_from_data(data, length)

Parameters:

• data (str) – CSS data to be parsed

• length (int) – the length of data in bytes, or -1 for NUL terminated strings

Loads data into self.

This clears any previously loaded information.

Deprecated since version 4.12: Use [method`Gtk`.CssProvider.load_from_string] or [method`Gtk`.CssProvider.load_from_bytes] instead

load_from_file(file)

Parameters:

file (Gio.File) – GFile pointing to a file to load

Loads the data contained in file into self.

This clears any previously loaded information.

load_from_path(path)

Parameters:

path (str) – the path of a filename to load, in the GLib filename encoding

Loads the data contained in path into self.

This clears any previously loaded information.

load_from_resource(resource_path)

Parameters:

resource_path (str) – a GResource resource path

Loads the data contained in the resource at resource_path into the self.

This clears any previously loaded information.

load_from_string(string)

Parameters:

string (str) – the CSS to load

Loads string into self.

This clears any previously loaded information.

New in version 4.12.

load_named(name, variant)

Parameters:

• name (str) – A theme name

• variant (str or None) – variant to load, for example, “dark”, or None for the default

Loads a theme from the usual theme paths.

The actual process of finding the theme might change between releases, but it is guaranteed that this function uses the same mechanism to load the theme that GTK uses for loading its own theme.

to_string()

Returns:

a new string representing the self.

Return type:

str

Converts the self into a string representation in CSS format.

Using [method`Gtk`.CssProvider.load_from_data] with the return value from this function on a new provider created with [ctor`Gtk`.CssProvider.new] will basically create a duplicate of this self.

Signal Details

Gtk.CssProvider.signals.parsing_error(css_provider, section, error)

Signal Name:

parsing-error

Flags:

RUN_LAST

Parameters:

• css_provider (Gtk.CssProvider) – The object which received the signal

• section (Gtk.CssSection) – section the error happened in

• error (GLib.Error) – The parsing error

Signals that a parsing error occurred.

The path, line and position describe the actual location of the error as accurately as possible.

Parsing errors are never fatal, so the parsing will resume after the error. Errors may however cause parts of the given data or even all of it to not be parsed at all. So it is a useful idea to check that the parsing succeeds by connecting to this signal.

Note that this signal may be emitted at any time as the css provider may opt to defer parsing parts or all of the input to a later time than when a loading function was called.