pub trait StyleContextExt: 'static {
Show 20 methods fn add_class(&self, class_name: &str);
fn add_provider(&self, provider: &impl IsA<StyleProvider>, priority: u32);
fn border(&self) -> Border;
fn color(&self) -> RGBA;
fn display(&self) -> Display;
fn margin(&self) -> Border;
fn padding(&self) -> Border;
fn scale(&self) -> i32;
fn state(&self) -> StateFlags;
fn has_class(&self, class_name: &str) -> bool;
fn lookup_color(&self, color_name: &str) -> Option<RGBA>;
fn remove_class(&self, class_name: &str);
fn remove_provider(&self, provider: &impl IsA<StyleProvider>);
fn restore(&self);
fn save(&self);
fn set_display(&self, display: &impl IsA<Display>);
fn set_scale(&self, scale: i32);
fn set_state(&self, flags: StateFlags);
fn to_string(&self, flags: StyleContextPrintFlags) -> GString;
fn connect_display_notify<F: Fn(&Self) + 'static>(
        f: F
    ) -> SignalHandlerId;
Expand description

Trait containing all StyleContext methods.



Required methods

Adds a style class to @self, so later uses of the style context will make use of this new class for styling.

In the CSS file format, a Entry defining a “search” class, would be matched by: { ... }

While any widget defining a “search” class would be matched by:

.search { ... }

class name to use in styling

Adds a style provider to @self, to be used in style construction.

Note that a style provider added by this function only affects the style of the widget to which @self belongs. If you want to affect the style of all widgets, use StyleContext::add_provider_for_display().

Note: If both priorities are the same, a StyleProvider added through this function takes precedence over another added through StyleContext::add_provider_for_display().


a StyleProvider


the priority of the style provider. The lower it is, the earlier it will be used in the style construction. Typically this will be in the range between GTK_STYLE_PROVIDER_PRIORITY_FALLBACK and GTK_STYLE_PROVIDER_PRIORITY_USER

Gets the border for a given state as a Border.


return value for the border settings

Gets the foreground color for a given state.


return value for the foreground color

Returns the gdk::Display to which @self is attached.


a gdk::Display.

Gets the margin for a given state as a Border.


return value for the margin settings

Gets the padding for a given state as a Border.


return value for the padding settings

Returns the scale used for assets.


the scale

Returns the state used for style matching.

This method should only be used to retrieve the StateFlags to pass to StyleContext methods, like padding(). If you need to retrieve the current state of a Widget, use WidgetExt::state_flags().


the state flags

Returns true if @self currently has defined the given class name.


a class name


true if @self has @class_name defined

Looks up and resolves a color name in the @self color map.


color name to lookup


true if @color_name was found and resolved, false otherwise


Return location for the looked up color

Removes @class_name from @self.


class name to remove

Removes @provider from the style providers list in @self.


a StyleProvider

Restores @self state to a previous stage.

See save().

Saves the @self state.

This allows temporary modifications done through add_class(), remove_class(), set_state() to be quickly reverted in one go through restore().

The matching call to restore() must be done before GTK returns to the main loop.

Attaches @self to the given display.

The display is used to add style information from “global” style providers, such as the display’s Settings instance.

If you are using a StyleContext returned from WidgetExt::style_context(), you do not need to call this yourself.


a gdk::Display

Sets the scale to use when getting image assets for the style.



Sets the state to be used for style matching.


state to represent

Converts the style context into a string representation.

The string representation always includes information about the name, state, id, visibility and style classes of the CSS node that is backing @self. Depending on the flags, more information may be included.

This function is intended for testing and debugging of the CSS implementation in GTK. There are no guarantees about the format of the returned string, it may change.


Flags that determine what to print


a newly allocated string representing @self