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GtkSettings provide a mechanism to share global settings between applications.
On the X window system, this sharing is realized by an
XSettings
manager that is usually part of the desktop environment, along with
utilities that let the user change these settings. In the absence of
an Xsettings manager, GTK+ reads default values for settings from
settings.ini
files in
/etc/gtk-4.0
, $XDG_CONFIG_DIRS/gtk-4.0
and $XDG_CONFIG_HOME/gtk-4.0
.
These files must be valid key files (see GKeyFile), and have
a section called Settings. Themes can also provide default values
for settings by installing a settings.ini
file
next to their gtk.css
file.
Applications can override system-wide settings by setting the property
of the GtkSettings object with g_object_set()
. This should be restricted
to special cases though; GtkSettings are not meant as an application
configuration facility. When doing so, you need to be aware that settings
that are specific to individual widgets may not be available before the
widget type has been realized at least once. The following example
demonstrates a way to do this:
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gtk_init (&argc, &argv); // make sure the type is realized g_type_class_unref (g_type_class_ref (GTK_TYPE_IMAGE_MENU_ITEM)); g_object_set (gtk_settings_get_default (), "gtk-enable-animations", FALSE, NULL); |
There is one GtkSettings instance per screen. It can be obtained with
gtk_settings_get_for_screen()
, but in many cases, it is more convenient
to use gtk_widget_get_settings()
. gtk_settings_get_default()
returns the
GtkSettings instance for the default screen.
GtkSettings *
gtk_settings_get_default (void
);
Gets the GtkSettings object for the default GDK screen, creating
it if necessary. See gtk_settings_get_for_screen()
.
a GtkSettings object. If there is
no default screen, then returns NULL
.
[nullable][transfer none]
GtkSettings *
gtk_settings_get_for_screen (GdkScreen *screen
);
Gets the GtkSettings object for screen
, creating it if necessary.
Since: 2.2
gboolean gtk_rc_property_parse_color (const GParamSpec *pspec
,const GString *gstring
,GValue *property_value
);
gboolean gtk_rc_property_parse_enum (const GParamSpec *pspec
,const GString *gstring
,GValue *property_value
);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses a single
enumeration value.
The enumeration value can be specified by its name, its nickname or its numeric value. For consistency with flags parsing, the value may be surrounded by parentheses.
TRUE
if gstring
could be parsed and property_value
has been set to the resulting GEnumValue.
gboolean gtk_rc_property_parse_flags (const GParamSpec *pspec
,const GString *gstring
,GValue *property_value
);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses flags.
Flags can be specified by their name, their nickname or
numerically. Multiple flags can be specified in the form
"( flag1 | flag2 | ... )"
.
TRUE
if gstring
could be parsed and property_value
has been set to the resulting flags value.
gboolean gtk_rc_property_parse_requisition (const GParamSpec *pspec
,const GString *gstring
,GValue *property_value
);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses a
requisition in the form
"{ width, height }"
for integers width
and height
.
TRUE
if gstring
could be parsed and property_value
has been set to the resulting GtkRequisition.
gboolean gtk_rc_property_parse_border (const GParamSpec *pspec
,const GString *gstring
,GValue *property_value
);
A GtkRcPropertyParser for use with gtk_settings_install_property_parser()
or gtk_widget_class_install_style_property_parser()
which parses
borders in the form
"{ left, right, top, bottom }"
for integers
left, right, top and bottom.
void gtk_settings_reset_property (GtkSettings *settings
,const gchar *name
);
Undoes the effect of calling g_object_set()
to install an
application-specific value for a setting. After this call,
the setting will again follow the session-wide value for
this setting.
Since: 3.20
struct GtkSettingsValue { /* origin should be something like "filename:linenumber" for rc files, * or e.g. "XProperty" for other sources */ gchar *origin; /* valid types are LONG, DOUBLE and STRING corresponding to the token parsed, * or a GSTRING holding an unparsed statement */ GValue value; };