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ca63330b19c920a02d02f1bc96463ba156312483
gtk3/gtk/gtkstylecontext.c
Matthias Clasen 5c63ab26da style context: Don't use g_warning for API misuse 
We've changed our API here; what these applications are doing
used to be fine. Don't make users suffer for this by spamming their
logs in a stable release. We'll keep the warning in master.

https://bugzilla.gnome.org/show_bug.cgi?id=763796
2016-03-20 20:53:34 -04:00

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95 KiB
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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkstylecontextprivate.h"
#include <gdk/gdk.h>
#include <math.h>
#include <stdlib.h>
#include <gobject/gvaluecollector.h>
#include "gtkcontainerprivate.h"
#include "gtkcssanimatedstyleprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssenumvalueprivate.h"
#include "gtkcssimagevalueprivate.h"
#include "gtkcssnodedeclarationprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcsspathnodeprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssshadowsvalueprivate.h"
#include "gtkcssstaticstyleprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcsstransformvalueprivate.h"
#include "gtkcsstransientnodeprivate.h"
#include "gtkcsswidgetnodeprivate.h"
#include "gtkdebug.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtkrenderbackgroundprivate.h"
#include "gtkrendericonprivate.h"
#include "gtksettings.h"
#include "gtksettingsprivate.h"
#include "gtkstylecascadeprivate.h"
#include "gtkstyleproviderprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwindow.h"
#include "gtkwidgetpath.h"
#include "gtkwidgetprivate.h"
#include "deprecated/gtkgradientprivate.h"
#include "deprecated/gtksymboliccolorprivate.h"
#include "fallback-c89.c"
/**
* SECTION:gtkstylecontext
* @Short_description: Rendering UI elements
* @Title: GtkStyleContext
*
* #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 gtk_style_context_set_screen(), as well
* as updating the context yourself using gtk_style_context_invalidate()
* whenever any of the conditions change, such as a change in the
* #GtkSettings:gtk-theme-name setting or a hierarchy change in the rendered
* widget. 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.
*/
typedef struct PropertyValue PropertyValue;
struct PropertyValue
{
GType widget_type;
GParamSpec *pspec;
GValue value;
};
struct _GtkStyleContextPrivate
{
GdkScreen *screen;
guint cascade_changed_id;
GtkStyleCascade *cascade;
GtkStyleContext *parent;
GtkCssNode *cssnode;
GSList *saved_nodes;
GArray *property_cache;
GdkFrameClock *frame_clock;
GtkCssStyleChange *invalidating_context;
};
enum {
PROP_0,
PROP_SCREEN,
PROP_DIRECTION,
PROP_FRAME_CLOCK,
PROP_PARENT,
LAST_PROP
};
enum {
CHANGED,
LAST_SIGNAL
};
static GParamSpec *properties[LAST_PROP] = { NULL, };
static guint signals[LAST_SIGNAL] = { 0 };
static void gtk_style_context_finalize (GObject *object);
static void gtk_style_context_impl_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_style_context_impl_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static GtkCssNode * gtk_style_context_get_root (GtkStyleContext *context);
G_DEFINE_TYPE_WITH_PRIVATE (GtkStyleContext, gtk_style_context, G_TYPE_OBJECT)
static void
gtk_style_context_real_changed (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
if (GTK_IS_CSS_WIDGET_NODE (priv->cssnode))
_gtk_widget_style_context_invalidated (gtk_css_widget_node_get_widget (GTK_CSS_WIDGET_NODE (priv->cssnode)));
}
static void
gtk_style_context_class_init (GtkStyleContextClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gtk_style_context_finalize;
object_class->set_property = gtk_style_context_impl_set_property;
object_class->get_property = gtk_style_context_impl_get_property;
klass->changed = gtk_style_context_real_changed;
signals[CHANGED] =
g_signal_new (I_("changed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkStyleContextClass, changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
properties[PROP_SCREEN] =
g_param_spec_object ("screen",
P_("Screen"),
P_("The associated GdkScreen"),
GDK_TYPE_SCREEN,
GTK_PARAM_READWRITE);
properties[PROP_FRAME_CLOCK] =
g_param_spec_object ("paint-clock",
P_("FrameClock"),
P_("The associated GdkFrameClock"),
GDK_TYPE_FRAME_CLOCK,
GTK_PARAM_READWRITE);
properties[PROP_DIRECTION] =
g_param_spec_enum ("direction",
P_("Direction"),
P_("Text direction"),
GTK_TYPE_TEXT_DIRECTION,
GTK_TEXT_DIR_LTR,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY|G_PARAM_DEPRECATED);
/**
* GtkStyleContext:parent:
*
* Sets or gets the style context’s parent. See gtk_style_context_set_parent()
* for details.
*
* Since: 3.4
*/
properties[PROP_PARENT] =
g_param_spec_object ("parent",
P_("Parent"),
P_("The parent style context"),
GTK_TYPE_STYLE_CONTEXT,
GTK_PARAM_READWRITE);
g_object_class_install_properties (object_class, LAST_PROP, properties);
}
void
gtk_style_context_clear_property_cache (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
guint i;
for (i = 0; i < priv->property_cache->len; i++)
{
PropertyValue *node = &g_array_index (priv->property_cache, PropertyValue, i);
g_param_spec_unref (node->pspec);
g_value_unset (&node->value);
}
g_array_set_size (priv->property_cache, 0);
}
static void
gtk_style_context_pop_style_node (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
g_return_if_fail (priv->saved_nodes != NULL);
if (GTK_IS_CSS_TRANSIENT_NODE (priv->cssnode))
gtk_css_node_set_parent (priv->cssnode, NULL);
g_object_unref (priv->cssnode);
priv->cssnode = priv->saved_nodes->data;
priv->saved_nodes = g_slist_remove (priv->saved_nodes, priv->cssnode);
}
static void
gtk_style_context_cascade_changed (GtkStyleCascade *cascade,
GtkStyleContext *context)
{
gtk_css_node_invalidate_style_provider (gtk_style_context_get_root (context));
}
static void
gtk_style_context_set_cascade (GtkStyleContext *context,
GtkStyleCascade *cascade)
{
GtkStyleContextPrivate *priv;
priv = context->priv;
if (priv->cascade == cascade)
return;
if (priv->cascade)
{
g_signal_handler_disconnect (priv->cascade, priv->cascade_changed_id);
priv->cascade_changed_id = 0;
g_object_unref (priv->cascade);
}
if (cascade)
{
g_object_ref (cascade);
priv->cascade_changed_id = g_signal_connect (cascade,
"-gtk-private-changed",
G_CALLBACK (gtk_style_context_cascade_changed),
context);
}
priv->cascade = cascade;
if (cascade && priv->cssnode != NULL)
gtk_style_context_cascade_changed (cascade, context);
}
static void
gtk_style_context_init (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv;
priv = context->priv = gtk_style_context_get_instance_private (context);
priv->screen = gdk_screen_get_default ();
if (priv->screen == NULL)
g_error ("Can't create a GtkStyleContext without a display connection");
priv->property_cache = g_array_new (FALSE, FALSE, sizeof (PropertyValue));
gtk_style_context_set_cascade (context,
_gtk_settings_get_style_cascade (gtk_settings_get_for_screen (priv->screen), 1));
/* Create default info store */
priv->cssnode = gtk_css_path_node_new (context);
gtk_css_node_set_state (priv->cssnode, GTK_STATE_FLAG_DIR_LTR);
}
static void
gtk_style_context_clear_parent (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
if (priv->parent)
g_object_unref (priv->parent);
}
static void
gtk_style_context_finalize (GObject *object)
{
GtkStyleContext *context = GTK_STYLE_CONTEXT (object);
GtkStyleContextPrivate *priv = context->priv;
while (priv->saved_nodes)
gtk_style_context_pop_style_node (context);
if (GTK_IS_CSS_PATH_NODE (priv->cssnode))
gtk_css_path_node_unset_context (GTK_CSS_PATH_NODE (priv->cssnode));
gtk_style_context_clear_parent (context);
gtk_style_context_set_cascade (context, NULL);
g_object_unref (priv->cssnode);
gtk_style_context_clear_property_cache (context);
g_array_free (priv->property_cache, TRUE);
G_OBJECT_CLASS (gtk_style_context_parent_class)->finalize (object);
}
static void
gtk_style_context_impl_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkStyleContext *context = GTK_STYLE_CONTEXT (object);
switch (prop_id)
{
case PROP_SCREEN:
gtk_style_context_set_screen (context, g_value_get_object (value));
break;
case PROP_DIRECTION:
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
gtk_style_context_set_direction (context, g_value_get_enum (value));
G_GNUC_END_IGNORE_DEPRECATIONS;
break;
case PROP_FRAME_CLOCK:
gtk_style_context_set_frame_clock (context, g_value_get_object (value));
break;
case PROP_PARENT:
gtk_style_context_set_parent (context, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_style_context_impl_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkStyleContext *context = GTK_STYLE_CONTEXT (object);
GtkStyleContextPrivate *priv = context->priv;
switch (prop_id)
{
case PROP_SCREEN:
g_value_set_object (value, priv->screen);
break;
case PROP_DIRECTION:
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
g_value_set_enum (value, gtk_style_context_get_direction (context));
G_GNUC_END_IGNORE_DEPRECATIONS;
break;
case PROP_FRAME_CLOCK:
g_value_set_object (value, priv->frame_clock);
break;
case PROP_PARENT:
g_value_set_object (value, priv->parent);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* returns TRUE if someone called gtk_style_context_save() but hasn’t
* called gtk_style_context_restore() yet.
* In those situations we don’t invalidate the context when somebody
* changes state/regions/classes.
*/
static gboolean
gtk_style_context_is_saved (GtkStyleContext *context)
{
return context->priv->saved_nodes != NULL;
}
static GtkCssNode *
gtk_style_context_get_root (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
if (priv->saved_nodes != NULL)
return g_slist_last (priv->saved_nodes)->data;
else
return priv->cssnode;
}
GtkStyleProviderPrivate *
gtk_style_context_get_style_provider (GtkStyleContext *context)
{
return GTK_STYLE_PROVIDER_PRIVATE (context->priv->cascade);
}
static gboolean
gtk_style_context_has_custom_cascade (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
GtkSettings *settings = gtk_settings_get_for_screen (priv->screen);
return priv->cascade != _gtk_settings_get_style_cascade (settings, _gtk_style_cascade_get_scale (priv->cascade));
}
GtkCssStyle *
gtk_style_context_lookup_style (GtkStyleContext *context)
{
/* Code will recreate style if it was changed */
return gtk_css_node_get_style (context->priv->cssnode);
}
GtkCssNode*
gtk_style_context_get_node (GtkStyleContext *context)
{
return context->priv->cssnode;
}
static GtkStateFlags
gtk_style_context_push_state (GtkStyleContext *context,
GtkStateFlags state)
{
GtkStyleContextPrivate *priv = context->priv;
GtkStateFlags current_state;
GtkCssNode *root;
current_state = gtk_css_node_get_state (priv->cssnode);
if (current_state == state)
return state;
root = gtk_style_context_get_root (context);
if (GTK_IS_CSS_TRANSIENT_NODE (priv->cssnode))
{
/* don't emit a warning, changing state here is fine */
}
else if (GTK_IS_CSS_WIDGET_NODE (root))
{
GtkWidget *widget = gtk_css_widget_node_get_widget (GTK_CSS_WIDGET_NODE (root));
g_debug ("State %u for %s %p doesn't match state %u set via gtk_style_context_set_state ()",
state, gtk_widget_get_name (widget), widget, gtk_css_node_get_state (priv->cssnode));
}
else
{
g_debug ("State %u for context %p doesn't match state %u set via gtk_style_context_set_state ()",
state, context, gtk_css_node_get_state (priv->cssnode));
}
gtk_css_node_set_state (priv->cssnode, state);
return current_state;
}
static void
gtk_style_context_pop_state (GtkStyleContext *context,
GtkStateFlags saved_state)
{
gtk_css_node_set_state (context->priv->cssnode, saved_state);
}
/**
* 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.
*
* This function is only useful when using the theming layer
* separated from GTK+, if you are using #GtkStyleContext to
* theme #GtkWidgets, use gtk_widget_get_style_context()
* in order to get a style context ready to theme the widget.
*
* Returns: A newly created #GtkStyleContext.
**/
GtkStyleContext *
gtk_style_context_new (void)
{
return g_object_new (GTK_TYPE_STYLE_CONTEXT, NULL);
}
GtkStyleContext *
gtk_style_context_new_for_node (GtkCssNode *node)
{
GtkStyleContext *context;
g_return_val_if_fail (GTK_IS_CSS_NODE (node), NULL);
context = gtk_style_context_new ();
g_set_object (&context->priv->cssnode, node);
return context;
}
/**
* gtk_style_context_add_provider:
* @context: a #GtkStyleContext
* @provider: a #GtkStyleProvider
* @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
*
* 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().
*
* Note: If both priorities are the same, a #GtkStyleProvider
* added through this function takes precedence over another added
* through gtk_style_context_add_provider_for_screen().
*
* Since: 3.0
**/
void
gtk_style_context_add_provider (GtkStyleContext *context,
GtkStyleProvider *provider,
guint priority)
{
GtkStyleContextPrivate *priv;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
priv = context->priv;
if (!gtk_style_context_has_custom_cascade (context))
{
GtkStyleCascade *new_cascade;
new_cascade = _gtk_style_cascade_new ();
_gtk_style_cascade_set_scale (new_cascade, _gtk_style_cascade_get_scale (priv->cascade));
_gtk_style_cascade_set_parent (new_cascade,
_gtk_settings_get_style_cascade (gtk_settings_get_for_screen (priv->screen), 1));
_gtk_style_cascade_add_provider (new_cascade, provider, priority);
gtk_style_context_set_cascade (context, new_cascade);
g_object_unref (new_cascade);
}
else
{
_gtk_style_cascade_add_provider (priv->cascade, provider, priority);
}
}
/**
* gtk_style_context_remove_provider:
* @context: a #GtkStyleContext
* @provider: a #GtkStyleProvider
*
* Removes @provider from the style providers list in @context.
*
* Since: 3.0
**/
void
gtk_style_context_remove_provider (GtkStyleContext *context,
GtkStyleProvider *provider)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
if (!gtk_style_context_has_custom_cascade (context))
return;
_gtk_style_cascade_remove_provider (context->priv->cascade, provider);
}
/**
* gtk_style_context_reset_widgets:
* @screen: a #GdkScreen
*
* 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
**/
void
gtk_style_context_reset_widgets (GdkScreen *screen)
{
GList *list, *toplevels;
toplevels = gtk_window_list_toplevels ();
g_list_foreach (toplevels, (GFunc) g_object_ref, NULL);
for (list = toplevels; list; list = list->next)
{
if (gtk_widget_get_screen (list->data) == screen)
gtk_widget_reset_style (list->data);
g_object_unref (list->data);
}
g_list_free (toplevels);
}
/**
* gtk_style_context_add_provider_for_screen:
* @screen: a #GdkScreen
* @provider: a #GtkStyleProvider
* @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
*
* Adds a global style provider to @screen, which will be used
* in style construction for all #GtkStyleContexts under @screen.
*
* GTK+ uses this to make styling information from #GtkSettings
* available.
*
* Note: If both priorities are the same, A #GtkStyleProvider
* added through gtk_style_context_add_provider() takes precedence
* over another added through this function.
*
* Since: 3.0
**/
void
gtk_style_context_add_provider_for_screen (GdkScreen *screen,
GtkStyleProvider *provider,
guint priority)
{
GtkStyleCascade *cascade;
g_return_if_fail (GDK_IS_SCREEN (screen));
g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
g_return_if_fail (!GTK_IS_SETTINGS (provider) || _gtk_settings_get_screen (GTK_SETTINGS (provider)) == screen);
cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_screen (screen), 1);
_gtk_style_cascade_add_provider (cascade, provider, priority);
}
/**
* gtk_style_context_remove_provider_for_screen:
* @screen: a #GdkScreen
* @provider: a #GtkStyleProvider
*
* Removes @provider from the global style providers list in @screen.
*
* Since: 3.0
**/
void
gtk_style_context_remove_provider_for_screen (GdkScreen *screen,
GtkStyleProvider *provider)
{
GtkStyleCascade *cascade;
g_return_if_fail (GDK_IS_SCREEN (screen));
g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
g_return_if_fail (!GTK_IS_SETTINGS (provider));
cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_screen (screen), 1);
_gtk_style_cascade_remove_provider (cascade, provider);
}
/**
* gtk_style_context_get_section:
* @context: a #GtkStyleContext
* @property: style property name
*
* 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().
*
* If the location is not available, %NULL will be returned. The
* location might not be available for various reasons, such as the
* property being overridden, @property not naming a supported CSS
* property or tracking of definitions being disabled for performance
* reasons.
*
* Shorthand CSS properties cannot be queried for a location and will
* always return %NULL.
*
* Returns: (nullable) (transfer none): %NULL or the section where a value
* for @property was defined
**/
GtkCssSection *
gtk_style_context_get_section (GtkStyleContext *context,
const gchar *property)
{
GtkCssStyle *values;
GtkStyleProperty *prop;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
g_return_val_if_fail (property != NULL, NULL);
prop = _gtk_style_property_lookup (property);
if (!GTK_IS_CSS_STYLE_PROPERTY (prop))
return NULL;
values = gtk_style_context_lookup_style (context);
return gtk_css_style_get_section (values, _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)));
}
static GtkCssValue *
gtk_style_context_query_func (guint id,
gpointer values)
{
return gtk_css_style_get_value (values, id);
}
/**
* gtk_style_context_get_property:
* @context: a #GtkStyleContext
* @property: style property name
* @state: state to retrieve the property value for
* @value: (out) (transfer full): return location for the style property value
*
* Gets a style property from @context for the given state.
*
* Note that not all CSS properties that are supported by GTK+ can be
* retrieved in this way, since they may not be representable as #GValue.
* GTK+ defines macros for a number of properties that can be used
* with this function.
*
* Note that passing a state other than the current state of @context
* is not recommended unless the style context has been saved with
* gtk_style_context_save().
*
* When @value is no longer needed, g_value_unset() must be called
* to free any allocated memory.
*
* Since: 3.0
**/
void
gtk_style_context_get_property (GtkStyleContext *context,
const gchar *property,
GtkStateFlags state,
GValue *value)
{
GtkStateFlags saved_state;
GtkStyleProperty *prop;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (property != NULL);
g_return_if_fail (value != NULL);
prop = _gtk_style_property_lookup (property);
if (prop == NULL)
{
g_warning ("Style property \"%s\" is not registered", property);
return;
}
if (_gtk_style_property_get_value_type (prop) == G_TYPE_NONE)
{
g_warning ("Style property \"%s\" is not gettable", property);
return;
}
saved_state = gtk_style_context_push_state (context, state);
_gtk_style_property_query (prop,
value,
gtk_style_context_query_func,
gtk_css_node_get_style (context->priv->cssnode));
gtk_style_context_pop_state (context, saved_state);
}
/**
* gtk_style_context_get_valist:
* @context: a #GtkStyleContext
* @state: state to retrieve the property values for
* @args: va_list of property name/return location pairs, followed by %NULL
*
* Retrieves several style property values from @context for a given state.
*
* See gtk_style_context_get_property() for details.
*
* Since: 3.0
*/
void
gtk_style_context_get_valist (GtkStyleContext *context,
GtkStateFlags state,
va_list args)
{
const gchar *property_name;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
property_name = va_arg (args, const gchar *);
while (property_name)
{
gchar *error = NULL;
GValue value = G_VALUE_INIT;
gtk_style_context_get_property (context,
property_name,
state,
&value);
G_VALUE_LCOPY (&value, args, 0, &error);
g_value_unset (&value);
if (error)
{
g_warning ("Could not get style property \"%s\": %s", property_name, error);
g_free (error);
break;
}
property_name = va_arg (args, const gchar *);
}
}
/**
* gtk_style_context_get:
* @context: a #GtkStyleContext
* @state: state to retrieve the property values for
* @...: property name /return value pairs, followed by %NULL
*
* Retrieves several style property values from @context for a
* given state.
*
* See gtk_style_context_get_property() for details.
*
* Since: 3.0
*/
void
gtk_style_context_get (GtkStyleContext *context,
GtkStateFlags state,
...)
{
va_list args;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
va_start (args, state);
gtk_style_context_get_valist (context, state, args);
va_end (args);
}
/*
* gtk_style_context_set_id:
* @context: a #GtkStyleContext
* @id: (allow-none): the id to use or %NULL for none.
*
* Sets the CSS ID to be used when obtaining style information.
**/
void
gtk_style_context_set_id (GtkStyleContext *context,
const char *id)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_node_set_id (context->priv->cssnode, id);
}
/*
* gtk_style_context_get_id:
* @context: a #GtkStyleContext
*
* Returns the CSS ID used when obtaining style information.
*
* Returns: the ID or %NULL if no ID is set.
**/
const char *
gtk_style_context_get_id (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return gtk_css_node_get_id (context->priv->cssnode);
}
/**
* gtk_style_context_set_state:
* @context: a #GtkStyleContext
* @flags: state to represent
*
* Sets the state to be used for style matching.
*
* Since: 3.0
**/
void
gtk_style_context_set_state (GtkStyleContext *context,
GtkStateFlags flags)
{
GtkStateFlags old_flags;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
old_flags = gtk_css_node_get_state (context->priv->cssnode);
gtk_css_node_set_state (context->priv->cssnode, flags);
if (((old_flags ^ flags) & (GTK_STATE_FLAG_DIR_LTR | GTK_STATE_FLAG_DIR_RTL)) &&
!gtk_style_context_is_saved (context))
g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_DIRECTION]);
}
/**
* gtk_style_context_get_state:
* @context: a #GtkStyleContext
*
* Returns the state used for style matching.
*
* This method should only be used to retrieve the #GtkStateFlags
* to pass to #GtkStyleContext methods, like gtk_style_context_get_padding().
* If you need to retrieve the current state of a #GtkWidget, use
* gtk_widget_get_state_flags().
*
* Returns: the state flags
*
* Since: 3.0
**/
GtkStateFlags
gtk_style_context_get_state (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0);
return gtk_css_node_get_state (context->priv->cssnode);
}
/**
* gtk_style_context_set_scale:
* @context: a #GtkStyleContext
* @scale: scale
*
* Sets the scale to use when getting image assets for the style.
*
* Since: 3.10
**/
void
gtk_style_context_set_scale (GtkStyleContext *context,
gint scale)
{
GtkStyleContextPrivate *priv;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
priv = context->priv;
if (scale == _gtk_style_cascade_get_scale (priv->cascade))
return;
if (gtk_style_context_has_custom_cascade (context))
{
_gtk_style_cascade_set_scale (priv->cascade, scale);
}
else
{
GtkStyleCascade *new_cascade;
new_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_screen (priv->screen),
scale);
gtk_style_context_set_cascade (context, new_cascade);
}
}
/**
* gtk_style_context_get_scale:
* @context: a #GtkStyleContext
*
* Returns the scale used for assets.
*
* Returns: the scale
*
* Since: 3.10
**/
gint
gtk_style_context_get_scale (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0);
return _gtk_style_cascade_get_scale (context->priv->cascade);
}
/**
* gtk_style_context_state_is_running:
* @context: a #GtkStyleContext
* @state: a widget state
* @progress: (out): return location for the transition progress
*
* Returns %TRUE if there is a transition animation running for the
* current region (see gtk_style_context_push_animatable_region()).
*
* If @progress is not %NULL, the animation progress will be returned
* there, 0.0 means the state is closest to being unset, while 1.0 means
* it’s closest to being set. This means transition animation will
* run from 0 to 1 when @state is being set and from 1 to 0 when
* it’s being unset.
*
* Returns: %TRUE if there is a running transition animation for @state.
*
* Since: 3.0
*
* Deprecated: 3.6: This function always returns %FALSE
**/
gboolean
gtk_style_context_state_is_running (GtkStyleContext *context,
GtkStateType state,
gdouble *progress)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE);
return FALSE;
}
/**
* gtk_style_context_set_path:
* @context: a #GtkStyleContext
* @path: a #GtkWidgetPath
*
* Sets the #GtkWidgetPath used for style matching. As a
* consequence, the style will be regenerated to match
* the new given path.
*
* If you are using a #GtkStyleContext returned from
* gtk_widget_get_style_context(), you do not need to call
* this yourself.
*
* Since: 3.0
**/
void
gtk_style_context_set_path (GtkStyleContext *context,
GtkWidgetPath *path)
{
GtkCssNode *root;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (path != NULL);
root = gtk_style_context_get_root (context);
g_return_if_fail (GTK_IS_CSS_PATH_NODE (root));
if (path && gtk_widget_path_length (path) > 0)
{
GtkWidgetPath *copy = gtk_widget_path_copy (path);
gtk_css_path_node_set_widget_path (GTK_CSS_PATH_NODE (root), copy);
gtk_css_node_set_widget_type (root,
gtk_widget_path_iter_get_object_type (copy, -1));
gtk_css_node_set_name (root, gtk_widget_path_iter_get_object_name (copy, -1));
gtk_widget_path_unref (copy);
}
else
{
gtk_css_path_node_set_widget_path (GTK_CSS_PATH_NODE (root), NULL);
gtk_css_node_set_widget_type (root, G_TYPE_NONE);
gtk_css_node_set_name (root, NULL);
}
}
/**
* gtk_style_context_get_path:
* @context: a #GtkStyleContext
*
* Returns the widget path used for style matching.
*
* Returns: (transfer none): A #GtkWidgetPath
*
* Since: 3.0
**/
const GtkWidgetPath *
gtk_style_context_get_path (GtkStyleContext *context)
{
return gtk_css_node_get_widget_path (gtk_style_context_get_root (context));
}
/**
* gtk_style_context_set_parent:
* @context: a #GtkStyleContext
* @parent: (allow-none): the new parent or %NULL
*
* Sets the parent style context for @context. The parent style
* context is used to implement
* [inheritance](http://www.w3.org/TR/css3-cascade/#inheritance)
* of properties.
*
* If you are using a #GtkStyleContext returned from
* gtk_widget_get_style_context(), the parent will be set for you.
*
* Since: 3.4
**/
void
gtk_style_context_set_parent (GtkStyleContext *context,
GtkStyleContext *parent)
{
GtkStyleContextPrivate *priv;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (parent == NULL || GTK_IS_STYLE_CONTEXT (parent));
priv = context->priv;
if (priv->parent == parent)
return;
if (parent)
{
GtkCssNode *root = gtk_style_context_get_root (context);
g_object_ref (parent);
if (gtk_css_node_get_parent (root) == NULL)
gtk_css_node_set_parent (root, gtk_style_context_get_root (parent));
}
else
{
gtk_css_node_set_parent (gtk_style_context_get_root (context), NULL);
}
gtk_style_context_clear_parent (context);
priv->parent = parent;
g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_PARENT]);
gtk_css_node_invalidate (gtk_style_context_get_root (context), GTK_CSS_CHANGE_ANY_PARENT | GTK_CSS_CHANGE_ANY_SIBLING);
}
/**
* gtk_style_context_get_parent:
* @context: a #GtkStyleContext
*
* Gets the parent context set via gtk_style_context_set_parent().
* See that function for details.
*
* Returns: (nullable) (transfer none): the parent context or %NULL
*
* Since: 3.4
**/
GtkStyleContext *
gtk_style_context_get_parent (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return context->priv->parent;
}
/*
* gtk_style_context_save_to_node:
* @context: a #GtkStyleContext
* @node: the node to save to
*
* 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. and rendering using
* gtk_render_background() or similar functions are done using the
* given @node.
*
* To undo, call gtk_style_context_restore().
*
* The matching call to gtk_style_context_restore() must be done
* before GTK returns to the main loop.
**/
void
gtk_style_context_save_to_node (GtkStyleContext *context,
GtkCssNode *node)
{
GtkStyleContextPrivate *priv;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GTK_IS_CSS_NODE (node));
priv = context->priv;
priv->saved_nodes = g_slist_prepend (priv->saved_nodes, priv->cssnode);
priv->cssnode = g_object_ref (node);
}
void
gtk_style_context_save_named (GtkStyleContext *context,
const char *name)
{
GtkStyleContextPrivate *priv;
GtkCssNode *cssnode;
priv = context->priv;
/* Make sure we have the style existing. It is the
* parent of the new saved node after all.
*/
if (!gtk_style_context_is_saved (context))
gtk_style_context_lookup_style (context);
cssnode = gtk_css_transient_node_new (priv->cssnode);
gtk_css_node_set_parent (cssnode, gtk_style_context_get_root (context));
if (name)
gtk_css_node_set_name (cssnode, g_intern_string (name));
gtk_style_context_save_to_node (context, cssnode);
g_object_unref (cssnode);
}
/**
* gtk_style_context_save:
* @context: a #GtkStyleContext
*
* 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().
*
* The matching call to gtk_style_context_restore() must be done
* before GTK returns to the main loop.
*
* Since: 3.0
**/
void
gtk_style_context_save (GtkStyleContext *context)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_style_context_save_named (context, NULL);
}
/**
* gtk_style_context_restore:
* @context: a #GtkStyleContext
*
* Restores @context state to a previous stage.
* See gtk_style_context_save().
*
* Since: 3.0
**/
void
gtk_style_context_restore (GtkStyleContext *context)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
if (context->priv->saved_nodes == NULL)
{
g_warning ("Unpaired gtk_style_context_restore() call");
return;
}
gtk_style_context_pop_style_node (context);
}
/**
* gtk_style_context_add_class:
* @context: a #GtkStyleContext
* @class_name: class name to use in styling
*
* 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.
*
* In the CSS file format, a #GtkEntry defining a “search”
* class, would be matched by:
*
* |[
* entry.search { ... }
* ]|
*
* While any widget defining a “search” class would be
* matched by:
* |[
* .search { ... }
* ]|
*
* Since: 3.0
**/
void
gtk_style_context_add_class (GtkStyleContext *context,
const gchar *class_name)
{
GQuark class_quark;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (class_name != NULL);
class_quark = g_quark_from_string (class_name);
gtk_css_node_add_class (context->priv->cssnode, class_quark);
}
/**
* gtk_style_context_remove_class:
* @context: a #GtkStyleContext
* @class_name: class name to remove
*
* Removes @class_name from @context.
*
* Since: 3.0
**/
void
gtk_style_context_remove_class (GtkStyleContext *context,
const gchar *class_name)
{
GQuark class_quark;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (class_name != NULL);
class_quark = g_quark_try_string (class_name);
if (!class_quark)
return;
gtk_css_node_remove_class (context->priv->cssnode, class_quark);
}
/**
* gtk_style_context_has_class:
* @context: a #GtkStyleContext
* @class_name: a class name
*
* Returns %TRUE if @context currently has defined the
* given class name.
*
* Returns: %TRUE if @context has @class_name defined
*
* Since: 3.0
**/
gboolean
gtk_style_context_has_class (GtkStyleContext *context,
const gchar *class_name)
{
GQuark class_quark;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE);
g_return_val_if_fail (class_name != NULL, FALSE);
class_quark = g_quark_try_string (class_name);
if (!class_quark)
return FALSE;
return gtk_css_node_has_class (context->priv->cssnode, class_quark);
}
/**
* gtk_style_context_list_classes:
* @context: a #GtkStyleContext
*
* Returns the list of classes currently defined in @context.
*
* Returns: (transfer container) (element-type utf8): a #GList of
* strings with the currently defined classes. The contents
* of the list are owned by GTK+, but you must free the list
* itself with g_list_free() when you are done with it.
*
* Since: 3.0
**/
GList *
gtk_style_context_list_classes (GtkStyleContext *context)
{
GList *classes_list = NULL;
const GQuark *classes;
guint n_classes, i;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
classes = gtk_css_node_list_classes (context->priv->cssnode, &n_classes);
for (i = n_classes; i > 0; i--)
classes_list = g_list_prepend (classes_list, (gchar *)g_quark_to_string (classes[i - 1]));
return classes_list;
}
/**
* gtk_style_context_list_regions:
* @context: a #GtkStyleContext
*
* Returns the list of regions currently defined in @context.
*
* Returns: (transfer container) (element-type utf8): a #GList of
* strings with the currently defined regions. The contents
* of the list are owned by GTK+, but you must free the list
* itself with g_list_free() when you are done with it.
*
* Since: 3.0
*
* Deprecated: 3.14
**/
GList *
gtk_style_context_list_regions (GtkStyleContext *context)
{
GList *regions, *l;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
regions = gtk_css_node_list_regions (context->priv->cssnode);
for (l = regions; l; l = l->next)
l->data = (char *) g_quark_to_string (GPOINTER_TO_UINT (l->data));
return regions;
}
gboolean
_gtk_style_context_check_region_name (const gchar *str)
{
g_return_val_if_fail (str != NULL, FALSE);
if (!g_ascii_islower (str[0]))
return FALSE;
while (*str)
{
if (*str != '-' &&
!g_ascii_islower (*str))
return FALSE;
str++;
}
return TRUE;
}
/**
* gtk_style_context_add_region:
* @context: a #GtkStyleContext
* @region_name: region name to use in styling
* @flags: flags that apply to the 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.
*
* In the CSS file format, a #GtkTreeView defining a “row”
* region, would be matched by:
*
* |[
* GtkTreeView row { ... }
* ]|
*
* Pseudo-classes are used for matching @flags, so the two
* following rules:
* |[
* GtkTreeView row:nth-child(even) { ... }
* GtkTreeView row:nth-child(odd) { ... }
* ]|
*
* would apply to even and odd rows, respectively.
*
* Region names must only contain lowercase letters
* and “-”, starting always with a lowercase letter.
*
* Since: 3.0
*
* Deprecated: 3.14
**/
void
gtk_style_context_add_region (GtkStyleContext *context,
const gchar *region_name,
GtkRegionFlags flags)
{
GQuark region_quark;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (region_name != NULL);
g_return_if_fail (_gtk_style_context_check_region_name (region_name));
region_quark = g_quark_from_string (region_name);
gtk_css_node_add_region (context->priv->cssnode, region_quark, flags);
}
/**
* gtk_style_context_remove_region:
* @context: a #GtkStyleContext
* @region_name: region name to unset
*
* Removes a region from @context.
*
* Since: 3.0
*
* Deprecated: 3.14
**/
void
gtk_style_context_remove_region (GtkStyleContext *context,
const gchar *region_name)
{
GQuark region_quark;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (region_name != NULL);
region_quark = g_quark_try_string (region_name);
if (!region_quark)
return;
gtk_css_node_remove_region (context->priv->cssnode, region_quark);
}
/**
* gtk_style_context_has_region:
* @context: a #GtkStyleContext
* @region_name: a region name
* @flags_return: (out) (allow-none): return location for region flags
*
* Returns %TRUE if @context has the region defined.
* If @flags_return is not %NULL, it is set to the flags
* affecting the region.
*
* Returns: %TRUE if region is defined
*
* Since: 3.0
*
* Deprecated: 3.14
**/
gboolean
gtk_style_context_has_region (GtkStyleContext *context,
const gchar *region_name,
GtkRegionFlags *flags_return)
{
GQuark region_quark;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE);
g_return_val_if_fail (region_name != NULL, FALSE);
if (flags_return)
*flags_return = 0;
region_quark = g_quark_try_string (region_name);
if (!region_quark)
return FALSE;
return gtk_css_node_has_region (context->priv->cssnode, region_quark, flags_return);
}
static gint
style_property_values_cmp (gconstpointer bsearch_node1,
gconstpointer bsearch_node2)
{
const PropertyValue *val1 = bsearch_node1;
const PropertyValue *val2 = bsearch_node2;
if (val1->widget_type != val2->widget_type)
return val1->widget_type < val2->widget_type ? -1 : 1;
if (val1->pspec != val2->pspec)
return val1->pspec < val2->pspec ? -1 : 1;
return 0;
}
GtkCssValue *
_gtk_style_context_peek_property (GtkStyleContext *context,
guint property_id)
{
GtkCssStyle *values = gtk_style_context_lookup_style (context);
return gtk_css_style_get_value (values, property_id);
}
const GValue *
_gtk_style_context_peek_style_property (GtkStyleContext *context,
GType widget_type,
GParamSpec *pspec)
{
GtkStyleContextPrivate *priv;
GtkWidgetPath *path;
PropertyValue *pcache, key = { 0 };
guint i;
priv = context->priv;
/* ensure the style cache is valid by forcing a validation */
gtk_style_context_lookup_style (context);
key.widget_type = widget_type;
key.pspec = pspec;
/* need value cache array */
pcache = bsearch (&key,
priv->property_cache->data, priv->property_cache->len,
sizeof (PropertyValue), style_property_values_cmp);
if (pcache)
return &pcache->value;
i = 0;
while (i < priv->property_cache->len &&
style_property_values_cmp (&key, &g_array_index (priv->property_cache, PropertyValue, i)) >= 0)
i++;
g_array_insert_val (priv->property_cache, i, key);
pcache = &g_array_index (priv->property_cache, PropertyValue, i);
/* cache miss, initialize value type, then set contents */
g_param_spec_ref (pcache->pspec);
g_value_init (&pcache->value, G_PARAM_SPEC_VALUE_TYPE (pspec));
path = gtk_css_node_create_widget_path (gtk_style_context_get_root (context));
if (path && gtk_widget_path_length (path) > 0)
{
if (gtk_style_provider_get_style_property (GTK_STYLE_PROVIDER (priv->cascade),
path,
gtk_widget_path_iter_get_state (path, -1),
pspec, &pcache->value))
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
/* Resolve symbolic colors to GdkColor/GdkRGBA */
if (G_VALUE_TYPE (&pcache->value) == GTK_TYPE_SYMBOLIC_COLOR)
{
GtkSymbolicColor *color;
GdkRGBA rgba;
color = g_value_dup_boxed (&pcache->value);
g_value_unset (&pcache->value);
if (G_PARAM_SPEC_VALUE_TYPE (pspec) == GDK_TYPE_RGBA)
g_value_init (&pcache->value, GDK_TYPE_RGBA);
else
g_value_init (&pcache->value, GDK_TYPE_COLOR);
if (_gtk_style_context_resolve_color (context, _gtk_symbolic_color_get_css_value (color), &rgba))
{
if (G_PARAM_SPEC_VALUE_TYPE (pspec) == GDK_TYPE_RGBA)
g_value_set_boxed (&pcache->value, &rgba);
else
{
GdkColor rgb;
rgb.red = rgba.red * 65535. + 0.5;
rgb.green = rgba.green * 65535. + 0.5;
rgb.blue = rgba.blue * 65535. + 0.5;
g_value_set_boxed (&pcache->value, &rgb);
}
}
else
g_param_value_set_default (pspec, &pcache->value);
gtk_symbolic_color_unref (color);
}
G_GNUC_END_IGNORE_DEPRECATIONS;
gtk_widget_path_unref (path);
return &pcache->value;
}
}
gtk_widget_path_unref (path);
/* not supplied by any provider, revert to default */
g_param_value_set_default (pspec, &pcache->value);
return &pcache->value;
}
/**
* gtk_style_context_get_style_property:
* @context: a #GtkStyleContext
* @property_name: the name of the widget style property
* @value: Return location for the property value
*
* Gets the value for a widget style property.
*
* When @value is no longer needed, g_value_unset() must be called
* to free any allocated memory.
**/
void
gtk_style_context_get_style_property (GtkStyleContext *context,
const gchar *property_name,
GValue *value)
{
GtkCssNode *root;
GtkWidgetClass *widget_class;
GParamSpec *pspec;
const GValue *peek_value;
GType widget_type;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (property_name != NULL);
g_return_if_fail (value != NULL);
root = gtk_style_context_get_root (context);
if (GTK_IS_CSS_WIDGET_NODE (root))
{
GtkWidget *widget;
widget = gtk_css_widget_node_get_widget (GTK_CSS_WIDGET_NODE (root));
if (widget == NULL)
return;
widget_type = G_OBJECT_TYPE (widget);
}
else if (GTK_IS_CSS_PATH_NODE (root))
{
GtkWidgetPath *path;
path = gtk_css_path_node_get_widget_path (GTK_CSS_PATH_NODE (root));
if (path == NULL)
return;
widget_type = gtk_widget_path_get_object_type (path);
if (!g_type_is_a (widget_type, GTK_TYPE_WIDGET))
{
g_warning ("%s: can't get style properties for non-widget class '%s'",
G_STRLOC,
g_type_name (widget_type));
return;
}
}
else
{
return;
}
widget_class = g_type_class_ref (widget_type);
pspec = gtk_widget_class_find_style_property (widget_class, property_name);
g_type_class_unref (widget_class);
if (!pspec)
{
g_warning ("%s: widget class '%s' has no style property named '%s'",
G_STRLOC,
g_type_name (widget_type),
property_name);
return;
}
peek_value = _gtk_style_context_peek_style_property (context, widget_type, pspec);
if (G_VALUE_TYPE (value) == G_VALUE_TYPE (peek_value))
g_value_copy (peek_value, value);
else if (g_value_type_transformable (G_VALUE_TYPE (peek_value), G_VALUE_TYPE (value)))
g_value_transform (peek_value, value);
else
g_warning ("can't retrieve style property '%s' of type '%s' as value of type '%s'",
pspec->name,
G_VALUE_TYPE_NAME (peek_value),
G_VALUE_TYPE_NAME (value));
}
/**
* gtk_style_context_get_style_valist:
* @context: a #GtkStyleContext
* @args: va_list of property name/return location pairs, followed by %NULL
*
* Retrieves several widget style properties from @context according to the
* current style.
*
* Since: 3.0
**/
void
gtk_style_context_get_style_valist (GtkStyleContext *context,
va_list args)
{
GtkCssNode *root;
const gchar *prop_name;
GType widget_type;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
prop_name = va_arg (args, const gchar *);
root = gtk_style_context_get_root (context);
if (GTK_IS_CSS_WIDGET_NODE (root))
{
GtkWidget *widget;
widget = gtk_css_widget_node_get_widget (GTK_CSS_WIDGET_NODE (root));
if (widget == NULL)
return;
widget_type = G_OBJECT_TYPE (widget);
}
else if (GTK_IS_CSS_PATH_NODE (root))
{
GtkWidgetPath *path;
path = gtk_css_path_node_get_widget_path (GTK_CSS_PATH_NODE (root));
if (path == NULL)
return;
widget_type = gtk_widget_path_get_object_type (path);
if (!g_type_is_a (widget_type, GTK_TYPE_WIDGET))
{
g_warning ("%s: can't get style properties for non-widget class '%s'",
G_STRLOC,
g_type_name (widget_type));
return;
}
}
else
{
return;
}
while (prop_name)
{
GtkWidgetClass *widget_class;
GParamSpec *pspec;
const GValue *peek_value;
gchar *error;
widget_class = g_type_class_ref (widget_type);
pspec = gtk_widget_class_find_style_property (widget_class, prop_name);
g_type_class_unref (widget_class);
if (!pspec)
{
g_warning ("%s: widget class '%s' has no style property named '%s'",
G_STRLOC,
g_type_name (widget_type),
prop_name);
break;
}
peek_value = _gtk_style_context_peek_style_property (context, widget_type, pspec);
G_VALUE_LCOPY (peek_value, args, 0, &error);
if (error)
{
g_warning ("can't retrieve style property '%s' of type '%s': %s",
pspec->name,
G_VALUE_TYPE_NAME (peek_value),
error);
g_free (error);
break;
}
prop_name = va_arg (args, const gchar *);
}
}
/**
* gtk_style_context_get_style:
* @context: a #GtkStyleContext
* @...: property name /return value pairs, followed by %NULL
*
* Retrieves several widget style properties from @context according to the
* current style.
*
* Since: 3.0
**/
void
gtk_style_context_get_style (GtkStyleContext *context,
...)
{
va_list args;
va_start (args, context);
gtk_style_context_get_style_valist (context, args);
va_end (args);
}
/**
* gtk_style_context_lookup_icon_set:
* @context: a #GtkStyleContext
* @stock_id: an icon name
*
* Looks up @stock_id in the icon factories associated to @context and
* the default icon factory, returning an icon set if found, otherwise
* %NULL.
*
* Returns: (transfer none): The looked up %GtkIconSet, or %NULL
*
* Deprecated: 3.10: Use gtk_icon_theme_lookup_icon() instead.
**/
GtkIconSet *
gtk_style_context_lookup_icon_set (GtkStyleContext *context,
const gchar *stock_id)
{
GtkIconSet *icon_set;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
g_return_val_if_fail (stock_id != NULL, NULL);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
icon_set = gtk_icon_factory_lookup_default (stock_id);
G_GNUC_END_IGNORE_DEPRECATIONS;
return icon_set;
}
/**
* gtk_style_context_set_screen:
* @context: a #GtkStyleContext
* @screen: a #GdkScreen
*
* Attaches @context to the given screen.
*
* The screen is used to add style information from “global” style
* providers, such as the screens #GtkSettings instance.
*
* If you are using a #GtkStyleContext returned from
* gtk_widget_get_style_context(), you do not need to
* call this yourself.
*
* Since: 3.0
**/
void
gtk_style_context_set_screen (GtkStyleContext *context,
GdkScreen *screen)
{
GtkStyleContextPrivate *priv;
GtkStyleCascade *screen_cascade;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GDK_IS_SCREEN (screen));
priv = context->priv;
if (priv->screen == screen)
return;
if (gtk_style_context_has_custom_cascade (context))
{
screen_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_screen (screen), 1);
_gtk_style_cascade_set_parent (priv->cascade, screen_cascade);
}
else
{
screen_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_screen (screen),
_gtk_style_cascade_get_scale (priv->cascade));
gtk_style_context_set_cascade (context, screen_cascade);
}
priv->screen = screen;
g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_SCREEN]);
}
/**
* gtk_style_context_get_screen:
* @context: a #GtkStyleContext
*
* Returns the #GdkScreen to which @context is attached.
*
* Returns: (transfer none): a #GdkScreen.
**/
GdkScreen *
gtk_style_context_get_screen (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return context->priv->screen;
}
/**
* gtk_style_context_set_frame_clock:
* @context: a #GdkFrameClock
* @frame_clock: a #GdkFrameClock
*
* Attaches @context to the given frame clock.
*
* The frame clock is used for the timing of animations.
*
* If you are using a #GtkStyleContext returned from
* gtk_widget_get_style_context(), you do not need to
* call this yourself.
*
* Since: 3.8
**/
void
gtk_style_context_set_frame_clock (GtkStyleContext *context,
GdkFrameClock *frame_clock)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (frame_clock == NULL || GDK_IS_FRAME_CLOCK (frame_clock));
if (g_set_object (&context->priv->frame_clock, frame_clock))
g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_FRAME_CLOCK]);
}
/**
* gtk_style_context_get_frame_clock:
* @context: a #GtkStyleContext
*
* Returns the #GdkFrameClock to which @context is attached.
*
* Returns: (nullable) (transfer none): a #GdkFrameClock, or %NULL
* if @context does not have an attached frame clock.
*
* Since: 3.8
**/
GdkFrameClock *
gtk_style_context_get_frame_clock (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return context->priv->frame_clock;
}
/**
* gtk_style_context_set_direction:
* @context: a #GtkStyleContext
* @direction: the new direction.
*
* Sets the reading direction for rendering purposes.
*
* If you are using a #GtkStyleContext returned from
* gtk_widget_get_style_context(), you do not need to
* call this yourself.
*
* Since: 3.0
*
* Deprecated: 3.8: Use gtk_style_context_set_state() with
* #GTK_STATE_FLAG_DIR_LTR and #GTK_STATE_FLAG_DIR_RTL
* instead.
**/
void
gtk_style_context_set_direction (GtkStyleContext *context,
GtkTextDirection direction)
{
GtkStateFlags state;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
state = gtk_style_context_get_state (context);
state &= ~(GTK_STATE_FLAG_DIR_LTR | GTK_STATE_FLAG_DIR_RTL);
switch (direction)
{
case GTK_TEXT_DIR_LTR:
state |= GTK_STATE_FLAG_DIR_LTR;
break;
case GTK_TEXT_DIR_RTL:
state |= GTK_STATE_FLAG_DIR_RTL;
break;
case GTK_TEXT_DIR_NONE:
default:
break;
}
gtk_style_context_set_state (context, state);
}
/**
* gtk_style_context_get_direction:
* @context: a #GtkStyleContext
*
* Returns the widget direction used for rendering.
*
* Returns: the widget direction
*
* Since: 3.0
*
* Deprecated: 3.8: Use gtk_style_context_get_state() and
* check for #GTK_STATE_FLAG_DIR_LTR and
* #GTK_STATE_FLAG_DIR_RTL instead.
**/
GtkTextDirection
gtk_style_context_get_direction (GtkStyleContext *context)
{
GtkStateFlags state;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), GTK_TEXT_DIR_LTR);
state = gtk_style_context_get_state (context);
if (state & GTK_STATE_FLAG_DIR_LTR)
return GTK_TEXT_DIR_LTR;
else if (state & GTK_STATE_FLAG_DIR_RTL)
return GTK_TEXT_DIR_RTL;
else
return GTK_TEXT_DIR_NONE;
}
/**
* gtk_style_context_set_junction_sides:
* @context: a #GtkStyleContext
* @sides: sides where rendered elements are visually connected to
* other elements
*
* Sets the sides where rendered elements (mostly through
* gtk_render_frame()) will visually connect with other visual elements.
*
* This is merely a hint that may or may not be honored
* by themes.
*
* Container widgets are expected to set junction hints as appropriate
* for their children, so it should not normally be necessary to call
* this function manually.
*
* Since: 3.0
**/
void
gtk_style_context_set_junction_sides (GtkStyleContext *context,
GtkJunctionSides sides)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_node_set_junction_sides (context->priv->cssnode, sides);
}
/**
* gtk_style_context_get_junction_sides:
* @context: a #GtkStyleContext
*
* Returns the sides where rendered elements connect visually with others.
*
* Returns: the junction sides
*
* Since: 3.0
**/
GtkJunctionSides
gtk_style_context_get_junction_sides (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0);
return gtk_css_node_get_junction_sides (context->priv->cssnode);
}
gboolean
_gtk_style_context_resolve_color (GtkStyleContext *context,
GtkCssValue *color,
GdkRGBA *result)
{
GtkCssValue *val;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE);
g_return_val_if_fail (color != NULL, FALSE);
g_return_val_if_fail (result != NULL, FALSE);
val = _gtk_css_color_value_resolve (color,
GTK_STYLE_PROVIDER_PRIVATE (context->priv->cascade),
_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR),
NULL);
if (val == NULL)
return FALSE;
*result = *_gtk_css_rgba_value_get_rgba (val);
_gtk_css_value_unref (val);
return TRUE;
}
/**
* gtk_style_context_lookup_color:
* @context: a #GtkStyleContext
* @color_name: color name to lookup
* @color: (out): Return location for the looked up color
*
* Looks up and resolves a color name in the @context color map.
*
* Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise
**/
gboolean
gtk_style_context_lookup_color (GtkStyleContext *context,
const gchar *color_name,
GdkRGBA *color)
{
GtkCssValue *value;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE);
g_return_val_if_fail (color_name != NULL, FALSE);
g_return_val_if_fail (color != NULL, FALSE);
value = _gtk_style_provider_private_get_color (GTK_STYLE_PROVIDER_PRIVATE (context->priv->cascade), color_name);
if (value == NULL)
return FALSE;
return _gtk_style_context_resolve_color (context, value, color);
}
/**
* gtk_style_context_notify_state_change:
* @context: a #GtkStyleContext
* @window: a #GdkWindow
* @region_id: (allow-none): animatable region to notify on, or %NULL.
* See gtk_style_context_push_animatable_region()
* @state: state to trigger transition for
* @state_value: %TRUE if @state is the state we are changing to,
* %FALSE if we are changing away from it
*
* 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.
*
* The @window parameter is used in order to invalidate the rendered area
* as the animation runs, so make sure it is the same window that is being
* rendered on by the gtk_render_*() functions.
*
* If @region_id is %NULL, all rendered elements using @context will be
* affected by this state transition.
*
* As a practical example, a #GtkButton notifying a state transition on
* the prelight state:
* |[<!-- language="C" -->
* gtk_style_context_notify_state_change (context,
* gtk_widget_get_window (widget),
* NULL,
* GTK_STATE_PRELIGHT,
* button->in_button);
* ]|
*
* Can be handled in the CSS file like this:
* |[
* GtkButton {
* background-color: #f00
* }
*
* GtkButton:hover {
* background-color: #fff;
* transition: 200ms linear
* }
* ]|
*
* This combination will animate the button background from red to white
* if a pointer enters the button, and back to red if the pointer leaves
* the button.
*
* Note that @state is used when finding the transition parameters, which
* is why the style places the transition under the :hover pseudo-class.
*
* Since: 3.0
*
* Deprecated: 3.6: This function does nothing.
**/
void
gtk_style_context_notify_state_change (GtkStyleContext *context,
GdkWindow *window,
gpointer region_id,
GtkStateType state,
gboolean state_value)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GDK_IS_WINDOW (window));
g_return_if_fail (state > GTK_STATE_NORMAL && state <= GTK_STATE_FOCUSED);
}
/**
* gtk_style_context_cancel_animations:
* @context: a #GtkStyleContext
* @region_id: (allow-none): animatable region to stop, or %NULL.
* See gtk_style_context_push_animatable_region()
*
* Stops all running animations for @region_id and all animatable
* regions underneath.
*
* A %NULL @region_id will stop all ongoing animations in @context,
* when dealing with a #GtkStyleContext obtained through
* gtk_widget_get_style_context(), this is normally done for you
* in all circumstances you would expect all widget to be stopped,
* so this should be only used in complex widgets with different
* animatable regions.
*
* Since: 3.0
*
* Deprecated: 3.6: This function does nothing.
**/
void
gtk_style_context_cancel_animations (GtkStyleContext *context,
gpointer region_id)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
}
/**
* gtk_style_context_scroll_animations:
* @context: a #GtkStyleContext
* @window: a #GdkWindow used previously in
* gtk_style_context_notify_state_change()
* @dx: Amount to scroll in the X axis
* @dy: Amount to scroll in the Y axis
*
* 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.
*
* Since: 3.0
*
* Deprecated: 3.6: This function does nothing.
**/
void
gtk_style_context_scroll_animations (GtkStyleContext *context,
GdkWindow *window,
gint dx,
gint dy)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GDK_IS_WINDOW (window));
}
/**
* gtk_style_context_push_animatable_region:
* @context: a #GtkStyleContext
* @region_id: unique identifier for the 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.
*
* The @region_id used must be unique in @context so the themes
* can uniquely identify rendered elements subject to a state transition.
*
* Since: 3.0
*
* Deprecated: 3.6: This function does nothing.
**/
void
gtk_style_context_push_animatable_region (GtkStyleContext *context,
gpointer region_id)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (region_id != NULL);
}
/**
* gtk_style_context_pop_animatable_region:
* @context: a #GtkStyleContext
*
* Pops an animatable region from @context.
* See gtk_style_context_push_animatable_region().
*
* Since: 3.0
*
* Deprecated: 3.6: This function does nothing.
**/
void
gtk_style_context_pop_animatable_region (GtkStyleContext *context)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
}
static GtkCssStyleChange magic_number;
void
gtk_style_context_validate (GtkStyleContext *context,
GtkCssStyleChange *change)
{
GtkStyleContextPrivate *priv;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
priv = context->priv;
/* Avoid reentrancy */
if (priv->invalidating_context)
return;
if (change)
priv->invalidating_context = change;
else
priv->invalidating_context = &magic_number;
g_signal_emit (context, signals[CHANGED], 0);
g_object_set_data (G_OBJECT (context), "font-cache-for-get_font", NULL);
priv->invalidating_context = NULL;
}
/**
* gtk_style_context_invalidate:
* @context: a #GtkStyleContext.
*
* Invalidates @context style information, so it will be reconstructed
* again. It is useful if you modify the @context and need the new
* information immediately.
*
* Since: 3.0
*
* Deprecated: 3.12: Style contexts are invalidated automatically.
**/
void
gtk_style_context_invalidate (GtkStyleContext *context)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_style_context_clear_property_cache (context);
gtk_style_context_validate (context, NULL);
}
/**
* gtk_style_context_set_background:
* @context: a #GtkStyleContext
* @window: a #GdkWindow
*
* Sets the background of @window to the background pattern or
* color specified in @context for its current state.
*
* Since: 3.0
*
* Deprecated: 3.18: Use gtk_render_background() instead.
* Note that clients still using this function are now responsible
* for calling this function again whenever @context is invalidated.
**/
void
gtk_style_context_set_background (GtkStyleContext *context,
GdkWindow *window)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GDK_IS_WINDOW (window));
/* This is a sophisticated optimization.
* If we know the GDK window's background will be opaque, we mark
* it as opaque. This is so GDK can do all the optimizations it does
* for opaque windows and be fast.
* This is mainly used when scrolling.
*
* We could indeed just set black instead of the color we have.
*/
if (gtk_css_style_render_background_is_opaque (gtk_style_context_lookup_style (context)))
{
const GdkRGBA *color;
color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
gdk_window_set_background_rgba (window, color);
}
else
{
GdkRGBA transparent = { 0.0, 0.0, 0.0, 0.0 };
gdk_window_set_background_rgba (window, &transparent);
}
}
/**
* gtk_style_context_get_color:
* @context: a #GtkStyleContext
* @state: state to retrieve the color for
* @color: (out): return value for the foreground color
*
* Gets the foreground color for a given state.
*
* See gtk_style_context_get_property() and
* #GTK_STYLE_PROPERTY_COLOR for details.
*
* Since: 3.0
**/
void
gtk_style_context_get_color (GtkStyleContext *context,
GtkStateFlags state,
GdkRGBA *color)
{
GdkRGBA *c;
g_return_if_fail (color != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_style_context_get (context,
state,
"color", &c,
NULL);
*color = *c;
gdk_rgba_free (c);
}
/**
* gtk_style_context_get_background_color:
* @context: a #GtkStyleContext
* @state: state to retrieve the color for
* @color: (out): return value for the background color
*
* Gets the background color for a given state.
*
* This function is far less useful than it seems, and it should not be used in
* newly written code. CSS has no concept of "background color", as a background
* can be an image, or a gradient, or any other pattern including solid colors.
*
* The only reason why you would call gtk_style_context_get_background_color() is
* to use the returned value to draw the background with it; the correct way to
* achieve this result is to use gtk_render_background() instead, along with CSS
* style classes to modify the color to be rendered.
*
* Since: 3.0
*
* Deprecated: 3.16: Use gtk_render_background() instead.
**/
void
gtk_style_context_get_background_color (GtkStyleContext *context,
GtkStateFlags state,
GdkRGBA *color)
{
GdkRGBA *c;
g_return_if_fail (color != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_style_context_get (context,
state,
"background-color", &c,
NULL);
*color = *c;
gdk_rgba_free (c);
}
/**
* gtk_style_context_get_border_color:
* @context: a #GtkStyleContext
* @state: state to retrieve the color for
* @color: (out): return value for the border color
*
* Gets the border color for a given state.
*
* Since: 3.0
*
* Deprecated: 3.16: Use gtk_render_frame() instead.
**/
void
gtk_style_context_get_border_color (GtkStyleContext *context,
GtkStateFlags state,
GdkRGBA *color)
{
GdkRGBA *c;
g_return_if_fail (color != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_style_context_get (context,
state,
"border-color", &c,
NULL);
*color = *c;
gdk_rgba_free (c);
}
/**
* gtk_style_context_get_border:
* @context: a #GtkStyleContext
* @state: state to retrieve the border for
* @border: (out): return value for the border settings
*
* Gets the border for a given state as a #GtkBorder.
*
* See gtk_style_context_get_property() and
* #GTK_STYLE_PROPERTY_BORDER_WIDTH for details.
*
* Since: 3.0
**/
void
gtk_style_context_get_border (GtkStyleContext *context,
GtkStateFlags state,
GtkBorder *border)
{
GtkCssStyle *style;
GtkStateFlags saved_state;
double top, left, bottom, right;
g_return_if_fail (border != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
saved_state = gtk_style_context_push_state (context, state);
style = gtk_style_context_lookup_style (context);
top = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BORDER_TOP_WIDTH), 100));
right = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BORDER_RIGHT_WIDTH), 100));
bottom = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BORDER_BOTTOM_WIDTH), 100));
left = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BORDER_LEFT_WIDTH), 100));
border->top = top;
border->left = left;
border->bottom = bottom;
border->right = right;
gtk_style_context_pop_state (context, saved_state);
}
/**
* gtk_style_context_get_padding:
* @context: a #GtkStyleContext
* @state: state to retrieve the padding for
* @padding: (out): return value for the padding settings
*
* 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
**/
void
gtk_style_context_get_padding (GtkStyleContext *context,
GtkStateFlags state,
GtkBorder *padding)
{
GtkCssStyle *style;
GtkStateFlags saved_state;
double top, left, bottom, right;
g_return_if_fail (padding != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
saved_state = gtk_style_context_push_state (context, state);
style = gtk_style_context_lookup_style (context);
top = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_PADDING_TOP), 100));
right = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_PADDING_RIGHT), 100));
bottom = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_PADDING_BOTTOM), 100));
left = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_PADDING_LEFT), 100));
padding->top = top;
padding->left = left;
padding->bottom = bottom;
padding->right = right;
gtk_style_context_pop_state (context, saved_state);
}
/**
* gtk_style_context_get_margin:
* @context: a #GtkStyleContext
* @state: state to retrieve the border for
* @margin: (out): return value for the margin settings
*
* 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
**/
void
gtk_style_context_get_margin (GtkStyleContext *context,
GtkStateFlags state,
GtkBorder *margin)
{
GtkCssStyle *style;
GtkStateFlags saved_state;
double top, left, bottom, right;
g_return_if_fail (margin != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
saved_state = gtk_style_context_push_state (context, state);
style = gtk_style_context_lookup_style (context);
top = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_MARGIN_TOP), 100));
right = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_MARGIN_RIGHT), 100));
bottom = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_MARGIN_BOTTOM), 100));
left = round (_gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_MARGIN_LEFT), 100));
margin->top = top;
margin->left = left;
margin->bottom = bottom;
margin->right = right;
gtk_style_context_pop_state (context, saved_state);
}
/**
* gtk_style_context_get_font:
* @context: a #GtkStyleContext
* @state: state to retrieve the font for
*
* Returns the font description for a given state. The returned
* object is const and will remain valid until the
* #GtkStyleContext::changed signal happens.
*
* Returns: (transfer none): the #PangoFontDescription for the given
* state. This object is owned by GTK+ and should not be
* freed.
*
* Since: 3.0
*
* Deprecated: 3.8: Use gtk_style_context_get() for "font" or
* subproperties instead.
**/
const PangoFontDescription *
gtk_style_context_get_font (GtkStyleContext *context,
GtkStateFlags state)
{
GHashTable *hash;
PangoFontDescription *description, *previous;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
/* Yuck, fonts are created on-demand but we don't return a ref.
* Do bad things to achieve this requirement */
gtk_style_context_get (context, state, "font", &description, NULL);
hash = g_object_get_data (G_OBJECT (context), "font-cache-for-get_font");
if (hash == NULL)
{
hash = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL,
(GDestroyNotify) pango_font_description_free);
g_object_set_data_full (G_OBJECT (context),
"font-cache-for-get_font",
hash,
(GDestroyNotify) g_hash_table_unref);
}
previous = g_hash_table_lookup (hash, GUINT_TO_POINTER (state));
if (previous)
{
pango_font_description_merge (previous, description, TRUE);
pango_font_description_free (description);
description = previous;
}
else
{
g_hash_table_insert (hash, GUINT_TO_POINTER (state), description);
}
return description;
}
void
_gtk_style_context_get_cursor_color (GtkStyleContext *context,
GdkRGBA *primary_color,
GdkRGBA *secondary_color)
{
GdkRGBA *pc, *sc;
gtk_style_context_get (context,
gtk_style_context_get_state (context),
"caret-color", &pc,
"-gtk-secondary-caret-color", &sc,
NULL);
if (primary_color)
*primary_color = *pc;
if (secondary_color)
*secondary_color = *sc;
gdk_rgba_free (pc);
gdk_rgba_free (sc);
}
static void
draw_insertion_cursor (GtkStyleContext *context,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble height,
gboolean is_primary,
PangoDirection direction,
gboolean draw_arrow)
{
GdkRGBA primary_color;
GdkRGBA secondary_color;
gfloat cursor_aspect_ratio;
gint stem_width;
gint offset;
cairo_save (cr);
cairo_new_path (cr);
_gtk_style_context_get_cursor_color (context, &primary_color, &secondary_color);
gdk_cairo_set_source_rgba (cr, is_primary ? &primary_color : &secondary_color);
/* When changing the shape or size of the cursor here,
* propagate the changes to gtktextview.c:text_window_invalidate_cursors().
*/
gtk_style_context_get_style (context,
"cursor-aspect-ratio", &cursor_aspect_ratio,
NULL);
stem_width = height * cursor_aspect_ratio + 1;
/* put (stem_width % 2) on the proper side of the cursor */
if (direction == PANGO_DIRECTION_LTR)
offset = stem_width / 2;
else
offset = stem_width - stem_width / 2;
cairo_rectangle (cr, x - offset, y, stem_width, height);
cairo_fill (cr);
if (draw_arrow)
{
gint arrow_width;
gint ax, ay;
arrow_width = stem_width + 1;
if (direction == PANGO_DIRECTION_RTL)
{
ax = x - offset - 1;
ay = y + height - arrow_width * 2 - arrow_width + 1;
cairo_move_to (cr, ax, ay + 1);
cairo_line_to (cr, ax - arrow_width, ay + arrow_width);
cairo_line_to (cr, ax, ay + 2 * arrow_width);
cairo_fill (cr);
}
else if (direction == PANGO_DIRECTION_LTR)
{
ax = x + stem_width - offset;
ay = y + height - arrow_width * 2 - arrow_width + 1;
cairo_move_to (cr, ax, ay + 1);
cairo_line_to (cr, ax + arrow_width, ay + arrow_width);
cairo_line_to (cr, ax, ay + 2 * arrow_width);
cairo_fill (cr);
}
else
g_assert_not_reached();
}
cairo_restore (cr);
}
/**
* gtk_render_insertion_cursor:
* @context: a #GtkStyleContext
* @cr: a #cairo_t
* @x: X origin
* @y: Y origin
* @layout: the #PangoLayout of the text
* @index: the index in the #PangoLayout
* @direction: the #PangoDirection of the text
*
* Draws a text caret on @cr at the specified index of @layout.
*
* Since: 3.4
**/
void
gtk_render_insertion_cursor (GtkStyleContext *context,
cairo_t *cr,
gdouble x,
gdouble y,
PangoLayout *layout,
int index,
PangoDirection direction)
{
GtkStyleContextPrivate *priv;
gboolean split_cursor;
PangoRectangle strong_pos, weak_pos;
PangoRectangle *cursor1, *cursor2;
PangoDirection keymap_direction;
PangoDirection direction2;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (cr != NULL);
g_return_if_fail (PANGO_IS_LAYOUT (layout));
g_return_if_fail (index >= 0);
priv = context->priv;
g_object_get (gtk_settings_get_for_screen (priv->screen),
"gtk-split-cursor", &split_cursor,
NULL);
keymap_direction = gdk_keymap_get_direction (gdk_keymap_get_for_display (gdk_screen_get_display (priv->screen)));
pango_layout_get_cursor_pos (layout, index, &strong_pos, &weak_pos);
direction2 = PANGO_DIRECTION_NEUTRAL;
if (split_cursor)
{
cursor1 = &strong_pos;
if (strong_pos.x != weak_pos.x || strong_pos.y != weak_pos.y)
{
direction2 = (direction == PANGO_DIRECTION_LTR) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
cursor2 = &weak_pos;
}
}
else
{
if (keymap_direction == direction)
cursor1 = &strong_pos;
else
cursor1 = &weak_pos;
}
draw_insertion_cursor (context,
cr,
x + PANGO_PIXELS (cursor1->x),
y + PANGO_PIXELS (cursor1->y),
PANGO_PIXELS (cursor1->height),
TRUE,
direction,
direction2 != PANGO_DIRECTION_NEUTRAL);
if (direction2 != PANGO_DIRECTION_NEUTRAL)
{
draw_insertion_cursor (context,
cr,
x + PANGO_PIXELS (cursor2->x),
y + PANGO_PIXELS (cursor2->y),
PANGO_PIXELS (cursor2->height),
FALSE,
direction2,
TRUE);
}
}
/**
* gtk_draw_insertion_cursor:
* @widget: a #GtkWidget
* @cr: cairo context to draw to
* @location: location where to draw the cursor (@location->width is ignored)
* @is_primary: if the cursor should be the primary cursor color.
* @direction: whether the cursor is left-to-right or
* right-to-left. Should never be #GTK_TEXT_DIR_NONE
* @draw_arrow: %TRUE to draw a directional arrow on the
* cursor. Should be %FALSE unless the cursor is split.
*
* Draws a text caret on @cr at @location. This is not a style function
* but merely a convenience function for drawing the standard cursor shape.
*
* Since: 3.0
* Deprecated: 3.4: Use gtk_render_insertion_cursor() instead.
*/
void
gtk_draw_insertion_cursor (GtkWidget *widget,
cairo_t *cr,
const GdkRectangle *location,
gboolean is_primary,
GtkTextDirection direction,
gboolean draw_arrow)
{
GtkStyleContext *context;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (cr != NULL);
g_return_if_fail (location != NULL);
g_return_if_fail (direction != GTK_TEXT_DIR_NONE);
context = gtk_widget_get_style_context (widget);
draw_insertion_cursor (context, cr,
location->x, location->y, location->height,
is_primary,
(direction == GTK_TEXT_DIR_RTL) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR,
draw_arrow);
}
/**
* gtk_style_context_get_change:
* @context: the context to query
*
* Queries the context for the changes for the currently executing
* GtkStyleContext::invalidate signal. If no signal is currently
* emitted or the signal has not been triggered by a CssNode
* invalidation, this function returns %NULL.
*
* FIXME 4.0: Make this part of the signal.
*
* Returns: %NULL or the currently invalidating changes
**/
GtkCssStyleChange *
gtk_style_context_get_change (GtkStyleContext *context)
{
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
if (context->priv->invalidating_context == &magic_number)
return NULL;
return context->priv->invalidating_context;
}
void
_gtk_style_context_get_icon_extents (GtkStyleContext *context,
GdkRectangle *extents,
gint x,
gint y,
gint width,
gint height)
{
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (extents != NULL);
if (_gtk_css_image_value_get_image (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_ICON_SOURCE)) == NULL)
{
extents->x = extents->y = extents->width = extents->height = 0;
return;
}
gtk_css_style_render_icon_get_extents (gtk_style_context_lookup_style (context),
extents,
x, y, width, height);
}
static PangoUnderline
get_pango_underline_from_style (GtkTextDecorationStyle style)
{
switch (style)
{
case GTK_CSS_TEXT_DECORATION_STYLE_DOUBLE:
return PANGO_UNDERLINE_DOUBLE;
case GTK_CSS_TEXT_DECORATION_STYLE_WAVY:
return PANGO_UNDERLINE_ERROR;
case GTK_CSS_TEXT_DECORATION_STYLE_SOLID:
default:
return PANGO_UNDERLINE_SINGLE;
}
g_return_val_if_reached (PANGO_UNDERLINE_SINGLE);
}
static PangoAttrList *
add_pango_attr(PangoAttrList *attrs, PangoAttribute *attr)
{
if (attrs == NULL)
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, attr);
return attrs;
}
PangoAttrList *
_gtk_style_context_get_pango_attributes (GtkStyleContext *context)
{
PangoAttrList *attrs = NULL;
GtkTextDecorationLine decoration_line;
GtkTextDecorationStyle decoration_style;
const GdkRGBA *color;
const GdkRGBA *decoration_color;
gint letter_spacing;
/* text-decoration */
decoration_line = _gtk_css_text_decoration_line_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_DECORATION_LINE));
decoration_style = _gtk_css_text_decoration_style_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_DECORATION_STYLE));
color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR));
decoration_color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_TEXT_DECORATION_COLOR));
switch (decoration_line)
{
case GTK_CSS_TEXT_DECORATION_LINE_UNDERLINE:
attrs = add_pango_attr (attrs, pango_attr_underline_new (get_pango_underline_from_style (decoration_style)));
if (!gdk_rgba_equal (color, decoration_color))
attrs = add_pango_attr (attrs, pango_attr_underline_color_new (decoration_color->red * 65535. + 0.5,
decoration_color->green * 65535. + 0.5,
decoration_color->blue * 65535. + 0.5));
break;
case GTK_CSS_TEXT_DECORATION_LINE_LINE_THROUGH:
attrs = add_pango_attr (attrs, pango_attr_strikethrough_new (TRUE));
if (!gdk_rgba_equal (color, decoration_color))
attrs = add_pango_attr (attrs, pango_attr_strikethrough_color_new (decoration_color->red * 65535. + 0.5,
decoration_color->green * 65535. + 0.5,
decoration_color->blue * 65535. + 0.5));
break;
case GTK_CSS_TEXT_DECORATION_LINE_NONE:
default:
break;
}
/* letter-spacing */
letter_spacing = _gtk_css_number_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_LETTER_SPACING), 100);
if (letter_spacing != 0)
{
attrs = add_pango_attr (attrs, pango_attr_letter_spacing_new (letter_spacing * PANGO_SCALE));
}
return attrs;
}
static AtkAttributeSet *
add_attribute (AtkAttributeSet *attributes,
AtkTextAttribute attr,
const gchar *value)
{
AtkAttribute *at;
at = g_new (AtkAttribute, 1);
at->name = g_strdup (atk_text_attribute_get_name (attr));
at->value = g_strdup (value);
return g_slist_prepend (attributes, at);
}
/*
* _gtk_style_context_get_attributes:
* @attributes: a #AtkAttributeSet to add attributes to
* @context: the #GtkStyleContext to get attributes from
* @flags: the state to use with @context
*
* Adds the foreground and background color from @context to
* @attributes, after translating them to ATK attributes.
*
* This is a convenience function that can be used in
* implementing the #AtkText interface in widgets.
*
* Returns: the modified #AtkAttributeSet
*/
AtkAttributeSet *
_gtk_style_context_get_attributes (AtkAttributeSet *attributes,
GtkStyleContext *context,
GtkStateFlags flags)
{
GdkRGBA color;
gchar *value;
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
gtk_style_context_get_background_color (context, flags, &color);
G_GNUC_END_IGNORE_DEPRECATIONS
value = g_strdup_printf ("%u,%u,%u",
(guint) ceil (color.red * 65536 - color.red),
(guint) ceil (color.green * 65536 - color.green),
(guint) ceil (color.blue * 65536 - color.blue));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_COLOR, value);
g_free (value);
gtk_style_context_get_color (context, flags, &color);
value = g_strdup_printf ("%u,%u,%u",
(guint) ceil (color.red * 65536 - color.red),
(guint) ceil (color.green * 65536 - color.green),
(guint) ceil (color.blue * 65536 - color.blue));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_FG_COLOR, value);
g_free (value);
return attributes;
}
cairo_pattern_t *
gtk_gradient_resolve_for_context (GtkGradient *gradient,
GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = context->priv;
g_return_val_if_fail (gradient != NULL, NULL);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return _gtk_gradient_resolve_full (gradient,
GTK_STYLE_PROVIDER_PRIVATE (priv->cascade),
gtk_style_context_lookup_style (context),
priv->parent ? gtk_style_context_lookup_style (priv->parent) : NULL);
}
/**
* GtkStyleContextPrintFlags:
* @GTK_STYLE_CONTEXT_PRINT_RECURSE: Print the entire tree of
* CSS nodes starting at the style context's node
* @GTK_STYLE_CONTEXT_PRINT_SHOW_STYLE: Show the values of the
* CSS properties for each node
*
* Flags that modify the behavior of gtk_style_context_to_string().
* New values may be added to this enumeration.
*/
/**
* gtk_style_context_to_string:
* @context: a #GtkStyleContext
* @flags: Flags that determine what to print
*
* 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 @context. 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.
*
* Returns: a newly allocated string representing @context
*
* Since: 3.20
*/
char *
gtk_style_context_to_string (GtkStyleContext *context,
GtkStyleContextPrintFlags flags)
{
GString *string;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
string = g_string_new ("");
gtk_css_node_print (context->priv->cssnode, flags, string, 0);
return g_string_free (string, FALSE);
}
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