Struct gtk4::CssProvider[][src]

pub struct CssProvider(_);
Expand description

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 property::Settings::gtk-theme-name setting), VARIANT is the variant to load (see the property::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::CssProvider::parsing-error signal.

Implements

glib::ObjectExt, StyleProviderExt

Implementations

Returns a newly created CssProvider.

Returns

A new CssProvider

Loads data into self.

This clears any previously loaded information.

data

CSS data loaded in memory

Loads the data contained in file into self.

This clears any previously loaded information.

file

GFile pointing to a file to load

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

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

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

Converts the self into a string representation in CSS format.

Using load_from_data() 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.

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

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Restrict a value to a certain interval. Read more

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

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

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

Returns the type identifier of Self.

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Performs the conversion.

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Same as connect but takes a SignalId instead of a signal name.

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Emit signal by signal id.

Same as emit but takes Value for the arguments.

Emit signal by its name.

Same as emit_by_name but takes Value for the arguments.

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Same as emit_with_details but takes Value for the arguments.

The resulting type after obtaining ownership.

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The type returned in the event of a conversion error.

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The type returned in the event of a conversion error.

Performs the conversion.