GI.Gtk.Objects.CssProvider

GtkCssProvider is an object implementing the StyleProvider interface. It is able to parse [CSS-like][css-overview] input in order to style widgets.

An application can make GTK+ parse a specific CSS style sheet by calling cssProviderLoadFromFile or cssProviderLoadFromResource and adding the provider with styleContextAddProvider or styleContextAddProviderForScreen.

In addition, certain files will be read when GTK+ is initialized. First, the file $XDG_CONFIG_HOME/gtk-3.0/gtk.css is loaded if it exists. Then, GTK+ loads the first existing file among XDG_DATA_HOME/themes/THEME/gtk-VERSION/gtk.css, $HOME/.themes/THEME/gtk-VERSION/gtk.css, $XDG_DATA_DIRS/themes/THEME/gtk-VERSION/gtk.css and DATADIR/share/themes/THEME/gtk-VERSION/gtk.css, where THEME is the name of the current theme (see the Settings:gtk-theme-name 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 3.0.

In the same way, GTK+ tries to load a gtk-keys.css file for the current key theme, as defined by Settings:gtk-key-theme-name.

Exported types

newtype CssProvider

Memory-managed wrapper type.

Constructors

CssProvider (ManagedPtr CssProvider)

Instances

Eq CssProvider

Defined in GI.Gtk.Objects.CssProvider

Methods

(==) :: CssProvider -> CssProvider -> Bool

(/=) :: CssProvider -> CssProvider -> Bool

IsGValue CssProvider

Convert CssProvider to and from GValue with toGValue and fromGValue.

Defined in GI.Gtk.Objects.CssProvider

Methods

toGValue :: CssProvider -> IO GValue

fromGValue :: GValue -> IO CssProvider

GObject CssProvider

Defined in GI.Gtk.Objects.CssProvider

Methods

gobjectType :: IO GType

HasParentTypes CssProvider

Defined in GI.Gtk.Objects.CssProvider

type ParentTypes CssProvider

Defined in GI.Gtk.Objects.CssProvider

type ParentTypes CssProvider = '[Object, StyleProvider]

class (GObject o, IsDescendantOf CssProvider o) => IsCssProvider o

Type class for types which can be safely cast to CssProvider, for instance with toCssProvider.

Instances

(GObject o, IsDescendantOf CssProvider o) => IsCssProvider o

Defined in GI.Gtk.Objects.CssProvider

toCssProvider :: (MonadIO m, IsCssProvider o) => o -> m CssProvider

Cast to CssProvider, for types for which this is known to be safe. For general casts, use castTo.

noCssProvider :: Maybe CssProvider

A convenience alias for Nothing :: Maybe CssProvider.

Methods

Overloaded methods

getDefault

cssProviderGetDefault

Arguments

:: (HasCallStack, MonadIO m)

=> m CssProvider

Returns: The provider used for fallback styling. This memory is owned by GTK+, and you must not free it.

Deprecated: (Since version 3.24)Use cssProviderNew instead.

Returns the provider containing the style settings used as a fallback for all widgets.

getNamed

cssProviderGetNamed

Arguments

:: (HasCallStack, MonadIO m)

=> Text

name: A theme name

-> Maybe Text

variant: variant to load, for example, "dark", or Nothing for the default

-> m CssProvider

Returns: a CssProvider with the theme loaded. This memory is owned by GTK+, and you must not free it.

Loads a theme from the usual theme paths

loadFromData

cssProviderLoadFromData

Arguments

:: (HasCallStack, MonadIO m, IsCssProvider a)

=> a

cssProvider: a CssProvider

-> ByteString

data: CSS data loaded in memory

-> m ()

(Can throw GError)

Loads data into cssProvider, and by doing so clears any previously loaded information.

loadFromFile

cssProviderLoadFromFile

Arguments

:: (HasCallStack, MonadIO m, IsCssProvider a, IsFile b)

=> a

cssProvider: a CssProvider

-> b

file: File pointing to a file to load

-> m ()

(Can throw GError)

Loads the data contained in file into cssProvider, making it clear any previously loaded information.

loadFromPath

cssProviderLoadFromPath

Arguments

:: (HasCallStack, MonadIO m, IsCssProvider a)

=> a

cssProvider: a CssProvider

-> Text

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

-> m ()

(Can throw GError)

Loads the data contained in path into cssProvider, making it clear any previously loaded information.

loadFromResource

cssProviderLoadFromResource

Arguments

:: (HasCallStack, MonadIO m, IsCssProvider a)

=> a

cssProvider: a CssProvider

-> Text

resourcePath: a Resource resource path

-> m ()

Loads the data contained in the resource at resourcePath into the CssProvider, clearing any previously loaded information.

To track errors while loading CSS, connect to the parsingError signal.

Since: 3.16

new

cssProviderNew

Arguments

:: (HasCallStack, MonadIO m)

=> m CssProvider

Returns: A new CssProvider

Returns a newly created CssProvider.

toString

cssProviderToString

Arguments

:: (HasCallStack, MonadIO m, IsCssProvider a)

=> a

provider: the provider to write to a string

-> m Text

Returns: a new string representing the provider.

Converts the provider into a string representation in CSS format.

Using cssProviderLoadFromData with the return value from this function on a new provider created with cssProviderNew will basically create a duplicate of this provider.

Since: 3.2

Signals

parsingError

type C_CssProviderParsingErrorCallback = Ptr () -> Ptr CssSection -> Ptr GError -> Ptr () -> IO ()

Type for the callback on the (unwrapped) C side.

type CssProviderParsingErrorCallback

Arguments

 = CssSection

section: section the error happened in

-> GError

error: The parsing error

-> IO ()

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.

afterCssProviderParsingError :: (IsCssProvider a, MonadIO m) => a -> CssProviderParsingErrorCallback -> m SignalHandlerId

Connect a signal handler for the parsingError signal, to be run after the default handler. When overloading is enabled, this is equivalent to

after cssProvider #parsingError callback

genClosure_CssProviderParsingError :: MonadIO m => CssProviderParsingErrorCallback -> m (GClosure C_CssProviderParsingErrorCallback)

Wrap the callback into a GClosure.

mk_CssProviderParsingErrorCallback :: C_CssProviderParsingErrorCallback -> IO (FunPtr C_CssProviderParsingErrorCallback)

Generate a function pointer callable from C code, from a C_CssProviderParsingErrorCallback.

noCssProviderParsingErrorCallback :: Maybe CssProviderParsingErrorCallback

A convenience synonym for Nothing :: Maybe CssProviderParsingErrorCallback.

onCssProviderParsingError :: (IsCssProvider a, MonadIO m) => a -> CssProviderParsingErrorCallback -> m SignalHandlerId

Connect a signal handler for the parsingError signal, to be run before the default handler. When overloading is enabled, this is equivalent to

on cssProvider #parsingError callback

wrap_CssProviderParsingErrorCallback :: CssProviderParsingErrorCallback -> C_CssProviderParsingErrorCallback

Wrap a CssProviderParsingErrorCallback into a C_CssProviderParsingErrorCallback.