Struct gtk4::CssProvider

pub struct CssProvider { /* private fields */ }

CssProvider is an object implementing the StyleProvider 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 load_from_file() or load_from_resource() and adding the provider with StyleContextExt::add_provider() or 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 gtk-theme-name setting), VARIANT is the variant to load (see the 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 parsing-error signal.

Signals

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.

StyleProvider

gtk-private-changed

Implements

[trait@glib::ObjectExt], StyleProviderExt

Implementations

impl CssProvider

pub fn new() -> CssProvider

Returns a newly created CssProvider.

Returns

A new CssProvider

pub fn load_from_bytes(&self, data: &Bytes)

Available on crate feature v4_12 only.

Loads @data into @self.

This clears any previously loaded information.

data

GBytes containing the data to load

pub fn load_from_data(&self, data: &str)

👎Deprecated: Since 4.12

Loads @data into @self.

This clears any previously loaded information.

Deprecated since 4.12

Use load_from_string() or load_from_bytes() instead

data

CSS data to be parsed

length

the length of @data in bytes, or -1 for NUL terminated strings

pub fn load_from_file(&self, file: &impl IsA<File>)

Loads the data contained in @file into @self.

This clears any previously loaded information.

file

GFile pointing to a file to load

pub fn load_from_path(&self, path: impl AsRef<Path>)

Loads the data contained in @path into @self.

This clears any previously loaded information.

path

the path of a filename to load, in the GLib filename encoding

pub fn load_from_resource(&self, resource_path: &str)

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

This clears any previously loaded information.

resource_path

a GResource resource path

pub fn load_from_string(&self, string: &str)

Available on crate feature v4_12 only.

Loads @string into @self.

This clears any previously loaded information.

string

the CSS to load

pub fn load_named(&self, name: &str, variant: Option<&str>)

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.

name

A theme name

variant

variant to load, for example, “dark”, or None for the default

pub fn to_str(&self) -> GString

Converts the @self into a string representation in CSS format.

Using load_from_string() with the return value from this function on a new provider created with new() will basically create a duplicate of this @self.

Returns

a new string representing the @self.

pub fn connect_parsing_error<F: Fn(&Self, &CssSection, &Error) + 'static>( &self, f: F ) -> SignalHandlerId

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.

section

section the error happened in

error

The parsing error

Trait Implementations

impl Clone for CssProvider

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CssProvider

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for CssProvider

fn default() -> Self

Returns the “default value” for a type.

impl Display for CssProvider

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl HasParamSpec for CssProvider

type ParamSpec = ParamSpecObject

type SetValue = CssProvider

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str) -> ParamSpecObjectBuilder<'_, CssProvider>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for CssProvider

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for CssProvider

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl ParentClassIs for CssProvider

type Parent = Object

impl<OT: ObjectType> PartialEq<OT> for CssProvider

fn eq(&self, other: &OT) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<OT: ObjectType> PartialOrd<OT> for CssProvider

fn partial_cmp(&self, other: &OT) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for CssProvider

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for CssProvider

impl IsA<StyleProvider> for CssProvider