Class
GtkStyleContext
Description [src]
class Gtk.StyleContext : GObject.Object
{
GtkStyleContextPrivate* priv
}GtkStyleContext is an object that stores styling information affecting
a widget defined by GtkWidgetPath.
In order to construct the final style information, GtkStyleContext
queries information from all attached GtkStyleProviders. Style providers
can be either attached explicitly to the context through
gtk_style_context_add_provider(), or to the screen through
gtk_style_context_add_provider_for_screen(). The resulting style is a
combination of all providers’ information in priority order.
For GTK+ widgets, any GtkStyleContext returned by
gtk_widget_get_style_context() will already have a GtkWidgetPath, a
GdkScreen and RTL/LTR information set. The style context will also be
updated automatically if any of these settings change on the widget.
If you are using the theming layer standalone, you will need to set a
widget path and a screen yourself to the created style context through
gtk_style_context_set_path() and possibly gtk_style_context_set_screen(). See
the “Foreign drawing“ example in gtk3-demo.
Style Classes # {#gtkstylecontext-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.
GTK+ defines macros for a number of style classes.
Style Regions
Widgets can also add regions with flags to their context. This feature is deprecated and will be removed in a future GTK+ update. Please use style classes instead.
GTK+ defines macros for a number of style regions.
Custom styling in UI libraries and applications
If you are developing a library with custom GtkWidgets that
render differently than standard components, you may need to add a
GtkStyleProvider yourself with the GTK_STYLE_PROVIDER_PRIORITY_FALLBACK
priority, either a GtkCssProvider or a custom object implementing the
GtkStyleProvider 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 GtkStyleProvider with the GTK_STYLE_PROVIDER_PRIORITY_APPLICATION
priority, keep in mind that the user settings in
XDG_CONFIG_HOME/gtk-3.0/gtk.css will
still take precedence over your changes, as it uses the
GTK_STYLE_PROVIDER_PRIORITY_USER priority.
Constructors
gtk_style_context_new
Creates a standalone GtkStyleContext, this style context
won’t be attached to any widget, so you may want
to call gtk_style_context_set_path() yourself.
Functions
gtk_style_context_add_provider_for_screen
Adds a global style provider to screen, which will be used
in style construction for all GtkStyleContexts under screen.
since: 3.0
gtk_style_context_remove_provider_for_screen
Removes provider from the global style providers list in screen.
since: 3.0
gtk_style_context_reset_widgets
This function recomputes the styles for all widgets under a particular
GdkScreen. This is useful when some global parameter has changed that
affects the appearance of all widgets, because when a widget gets a new
style, it will both redraw and recompute any cached information about
its appearance. As an example, it is used when the color scheme changes
in the related GtkSettings object.
since: 3.0
Instance methods
gtk_style_context_add_class
Adds a style class to context, so posterior calls to
gtk_style_context_get() or any of the gtk_render_*()
functions will make use of this new class for styling.
since: 3.0
gtk_style_context_add_provider
Adds a style provider to context, to be used in style construction.
Note that a style provider added by this function only affects
the style of the widget to which context belongs. If you want
to affect the style of all widgets, use gtk_style_context_add_provider_for_screen().
since: 3.0
gtk_style_context_add_region
Adds a region to context, so posterior calls to
gtk_style_context_get() or any of the gtk_render_*()
functions will make use of this new region for styling.
deprecated: 3.14 since: 3.0
gtk_style_context_cancel_animations
Stops all running animations for region_id and all animatable
regions underneath.
deprecated: 3.6 since: 3.0
gtk_style_context_get
Retrieves several style property values from context for a
given state.
since: 3.0
gtk_style_context_get_background_color
Gets the background color for a given state.
deprecated: 3.16 since: 3.0
gtk_style_context_get_border_color
Gets the border color for a given state.
deprecated: 3.16 since: 3.0
gtk_style_context_get_direction
Returns the widget direction used for rendering.
deprecated: 3.8 since: 3.0
gtk_style_context_get_font
Returns the font description for a given state. The returned
object is const and will remain valid until the
GtkStyleContext::changed signal happens.
deprecated: 3.8 since: 3.0
gtk_style_context_get_frame_clock
Returns the GdkFrameClock to which context is attached.
since: 3.8
gtk_style_context_get_junction_sides
Returns the sides where rendered elements connect visually with others.
since: 3.0
gtk_style_context_get_margin
Gets the margin for a given state as a GtkBorder.
See gtk_style_property_get() and #GTK_STYLE_PROPERTY_MARGIN
for details.
since: 3.0
gtk_style_context_get_padding
Gets the padding for a given state as a GtkBorder.
See gtk_style_context_get() and #GTK_STYLE_PROPERTY_PADDING
for details.
since: 3.0
gtk_style_context_get_parent
Gets the parent context set via gtk_style_context_set_parent(). See that function for details.
since: 3.4
gtk_style_context_get_section
Queries the location in the CSS where property was defined for the
current context. Note that the state to be queried is taken from gtk_style_context_get_state().
gtk_style_context_get_style
Retrieves several widget style properties from context according to the
current style.
since: 3.0
gtk_style_context_get_style_valist
Retrieves several widget style properties from context according to the
current style.
since: 3.0
gtk_style_context_get_valist
Retrieves several style property values from context for a given state.
since: 3.0
gtk_style_context_has_class
Returns TRUE if context currently has defined the
given class name.
since: 3.0
gtk_style_context_has_region
Returns TRUE if context has the region defined.
If flags_return is not NULL, it is set to the flags
affecting the region.
deprecated: 3.14 since: 3.0
gtk_style_context_invalidate
Invalidates context style information, so it will be reconstructed
again. It is useful if you modify the context and need the new
information immediately.
deprecated: 3.12 since: 3.0
gtk_style_context_list_regions
Returns the list of regions currently defined in context.
deprecated: 3.14 since: 3.0
gtk_style_context_lookup_icon_set
Looks up stock_id in the icon factories associated to context and
the default icon factory, returning an icon set if found, otherwise
NULL.
deprecated: 3.10
gtk_style_context_notify_state_change
Notifies a state change on context, so if the current style makes use
of transition animations, one will be started so all rendered elements
under region_id are animated for state state being set to value
state_value.
deprecated: 3.6 since: 3.0
gtk_style_context_pop_animatable_region
Pops an animatable region from context.
See gtk_style_context_push_animatable_region().
deprecated: 3.6 since: 3.0
gtk_style_context_push_animatable_region
Pushes an animatable region, so all further gtk_render_*() calls between
this call and the following gtk_style_context_pop_animatable_region()
will potentially show transition animations for this region if
gtk_style_context_notify_state_change() is called for a given state,
and the current theme/style defines transition animations for state changes.
deprecated: 3.6 since: 3.0
gtk_style_context_remove_provider
Removes provider from the style providers list in context.
since: 3.0
gtk_style_context_restore
Restores context state to a previous stage.
See gtk_style_context_save().
since: 3.0
gtk_style_context_save
Saves the context state, so temporary modifications done through
gtk_style_context_add_class(), gtk_style_context_remove_class(),
gtk_style_context_set_state(), etc. can quickly be reverted
in one go through gtk_style_context_restore().
since: 3.0
gtk_style_context_scroll_animations
This function is analogous to gdk_window_scroll(), and should be called together with it so the invalidation areas for any ongoing animation are scrolled together with it.
deprecated: 3.6 since: 3.0
gtk_style_context_set_background
Sets the background of window to the background pattern or
color specified in context for its current state.
deprecated: 3.18 since: 3.0
gtk_style_context_set_direction
Sets the reading direction for rendering purposes.
deprecated: 3.8 since: 3.0
gtk_style_context_set_junction_sides
Sets the sides where rendered elements (mostly through gtk_render_frame()) will visually connect with other visual elements.
since: 3.0
gtk_style_context_set_parent
Sets the parent style context for context. The parent style
context is used to implement
inheritance
of properties.
since: 3.4
gtk_style_context_set_path
Sets the GtkWidgetPath used for style matching. As a
consequence, the style will be regenerated to match
the new given path.
since: 3.0
gtk_style_context_set_scale
Sets the scale to use when getting image assets for the style.
since: 3.10
gtk_style_context_state_is_running
Returns TRUE if there is a transition animation running for the
current region (see gtk_style_context_push_animatable_region()).
deprecated: 3.6 since: 3.0
Properties
Gtk.StyleContext:parent
Sets or gets the style context’s parent. See gtk_style_context_set_parent()
for details.
since: 3.4
Signals
Gtk.StyleContext::changed
The ::changed signal is emitted when there is a change in the
GtkStyleContext.
since: 3.0
Signals inherited from GObject (1)
GObject::notify
The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.
Class structure
struct GtkStyleContextClass {
GObjectClass parent_class;
void (* changed) (
GtkStyleContext* context
);
void (* _gtk_reserved1) (
void
);
void (* _gtk_reserved2) (
void
);
void (* _gtk_reserved3) (
void
);
void (* _gtk_reserved4) (
void
);
}No description available.
Class members
parent_class: GObjectClassNo description available.
changed: void (* changed) ( GtkStyleContext* context )No description available.
_gtk_reserved1: void (* _gtk_reserved1) ( void )No description available.
_gtk_reserved2: void (* _gtk_reserved2) ( void )No description available.
_gtk_reserved3: void (* _gtk_reserved3) ( void )No description available.
_gtk_reserved4: void (* _gtk_reserved4) ( void )No description available.