Struct gtk4::StyleContext

source ·
#[repr(transparent)]
pub struct StyleContext { /* private fields */ }
Expand description

StyleContext stores styling information affecting a widget.

In order to construct the final style information, StyleContext queries information from all attached GtkStyleProviders. Style providers can be either attached explicitly to the context through StyleContextExt::add_provider(), or to the display through add_provider_for_display(). The resulting style is a combination of all providers’ information in priority order.

For GTK widgets, any StyleContext returned by WidgetExt::style_context() will already have a gdk::Display and RTL/LTR information set. The style context will also be updated automatically if any of these settings change on the widget.

Style Classes

Widgets can add style classes to their context, which can be used to associate different styles by class. The documentation for individual widgets lists which style classes it uses itself, and which style classes may be added by applications to affect their appearance.

Custom styling in UI libraries and applications

If you are developing a library with custom widgets that render differently than standard components, you may need to add a StyleProvider yourself with the GTK_STYLE_PROVIDER_PRIORITY_FALLBACK priority, either a CssProvider or a custom object implementing the StyleProvider interface. This way themes may still attempt to style your UI elements in a different way if needed so.

If you are using custom styling on an applications, you probably want then to make your style information prevail to the theme’s, so you must use a StyleProvider with the GTK_STYLE_PROVIDER_PRIORITY_APPLICATION priority, keep in mind that the user settings in XDG_CONFIG_HOME/gtk-4.0/gtk.css will still take precedence over your changes, as it uses the GTK_STYLE_PROVIDER_PRIORITY_USER priority.

Implements

StyleContextExt, glib::ObjectExt

Implementations

Adds a global style provider to @display, which will be used in style construction for all GtkStyleContexts under @display.

GTK uses this to make styling information from Settings available.

Note: If both priorities are the same, A StyleProvider added through StyleContextExt::add_provider() takes precedence over another added through this function.

display

a gdk::Display

provider

a StyleProvider

priority

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

Removes @provider from the global style providers list in @display.

display

a gdk::Display

provider

a StyleProvider

Trait Implementations

Returns a copy of the value. Read more
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This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
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This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
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.

Auto Trait Implementations

Blanket Implementations

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Upcasts an object to a superclass or interface T. Read more
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Calls U::from(self).

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Check if the object has a property property_name of the given type_. Read more
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Same as Self::emit but takes Value for the arguments.
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Emit signal by signal id with details. Read more
Disconnect a previously connected signal handler.
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