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gtk2/gtk/gtkstylecontext.c
Philip Withnall 13f4d639fd gtkstyleprovider: Rename -gtk-style-changed signal to have a valid name 
Signal names must start with a letter. They can’t start with a hyphen.

It was originally added in commit 74f4c6f6bd with no given reason
for why the signal name was chosen as it was.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
2019-11-12 19:51:33 +00:00

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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 "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 "gtkcssstylepropertyprivate.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 "gtkwidgetpath.h"
#include "gtkwidgetprivate.h"
/**
* 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 display through
* gtk_style_context_add_provider_for_display(). 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
* #GdkDisplay 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 display yourself to the created style context through
* gtk_style_context_set_path() and possibly gtk_style_context_set_display().
* See the “Foreign drawing“ example in gtk4-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.
*
* # 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-4.0/gtk.css` will
* still take precedence over your changes, as it uses the
* %GTK_STYLE_PROVIDER_PRIORITY_USER priority.
*/
#define CURSOR_ASPECT_RATIO (0.04)
typedef struct PropertyValue PropertyValue;
struct PropertyValue
{
GType widget_type;
GParamSpec *pspec;
GValue value;
};
struct _GtkStyleContextPrivate
{
GdkDisplay *display;
guint cascade_changed_id;
GtkStyleCascade *cascade;
GtkStyleContext *parent;
GtkCssNode *cssnode;
GSList *saved_nodes;
GtkCssStyleChange *invalidating_context;
};
typedef struct _GtkStyleContextPrivate GtkStyleContextPrivate;
enum {
PROP_0,
PROP_DISPLAY,
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 = gtk_style_context_get_instance_private (context);
if (GTK_IS_CSS_WIDGET_NODE (priv->cssnode))
{
GtkWidget *widget = gtk_css_widget_node_get_widget (GTK_CSS_WIDGET_NODE (priv->cssnode));
if (widget != NULL)
_gtk_widget_style_context_invalidated (widget);
}
}
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;
/**
* GtkStyleContext::changed:
*
* The ::changed signal is emitted when there is a change in the
* #GtkStyleContext.
*
* For a #GtkStyleContext returned by gtk_widget_get_style_context(), the
* #GtkWidget::style-updated signal/vfunc might be more convenient to use.
*
* This signal is useful when using the theming layer standalone.
*/
signals[CHANGED] =
g_signal_new (I_("changed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkStyleContextClass, changed),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
properties[PROP_DISPLAY] =
g_param_spec_object ("display",
P_("Display"),
P_("The associated GdkDisplay"),
GDK_TYPE_DISPLAY,
GTK_PARAM_READWRITE);
/**
* GtkStyleContext:parent:
*
* Sets or gets the style context’s parent. See gtk_style_context_set_parent()
* for details.
*/
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);
}
static void
gtk_style_context_pop_style_node (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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 = gtk_style_context_get_instance_private (context);
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 = gtk_style_context_get_instance_private (context);
priv->display = gdk_display_get_default ();
if (priv->display == NULL)
g_error ("Can't create a GtkStyleContext without a display connection");
gtk_style_context_set_cascade (context,
_gtk_settings_get_style_cascade (gtk_settings_get_for_display (priv->display), 1));
}
static void
gtk_style_context_clear_parent (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
if (priv->parent)
g_object_unref (priv->parent);
}
static void
gtk_style_context_finalize (GObject *object)
{
GtkStyleContext *context = GTK_STYLE_CONTEXT (object);
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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);
if (priv->cssnode)
g_object_unref (priv->cssnode);
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_DISPLAY:
gtk_style_context_set_display (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 = gtk_style_context_get_instance_private (context);
switch (prop_id)
{
case PROP_DISPLAY:
g_value_set_object (value, priv->display);
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/classes.
*/
static gboolean
gtk_style_context_is_saved (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
return priv->saved_nodes != NULL;
}
static GtkCssNode *
gtk_style_context_get_root (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
if (priv->saved_nodes != NULL)
return g_slist_last (priv->saved_nodes)->data;
else
return priv->cssnode;
}
GtkStyleProvider *
gtk_style_context_get_style_provider (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
return GTK_STYLE_PROVIDER (priv->cascade);
}
static gboolean
gtk_style_context_has_custom_cascade (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
GtkSettings *settings = gtk_settings_get_for_display (priv->display);
return priv->cascade != _gtk_settings_get_style_cascade (settings, _gtk_style_cascade_get_scale (priv->cascade));
}
GtkCssStyle *
gtk_style_context_lookup_style (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
/* Code will recreate style if it was changed */
return gtk_css_node_get_style (priv->cssnode);
}
GtkCssNode*
gtk_style_context_get_node (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
return priv->cssnode;
}
/**
* 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)
{
GtkStyleContext *context = g_object_new (GTK_TYPE_STYLE_CONTEXT, NULL);
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
/* Create default info store */
priv->cssnode = gtk_css_path_node_new (context);
gtk_css_node_set_state (priv->cssnode, GTK_STATE_FLAG_DIR_LTR);
return context;
}
GtkStyleContext *
gtk_style_context_new_for_node (GtkCssNode *node)
{
GtkStyleContext *context;
GtkStyleContextPrivate *priv;
g_return_val_if_fail (GTK_IS_CSS_NODE (node), NULL);
context = g_object_new (GTK_TYPE_STYLE_CONTEXT, NULL);
priv = gtk_style_context_get_instance_private (context);
priv->cssnode = g_object_ref (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_display().
*
* 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_display().
**/
void
gtk_style_context_add_provider (GtkStyleContext *context,
GtkStyleProvider *provider,
guint priority)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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))
{
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_display (priv->display), 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.
**/
void
gtk_style_context_remove_provider (GtkStyleContext *context,
GtkStyleProvider *provider)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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 (priv->cascade, provider);
}
/**
* gtk_style_context_reset_widgets:
* @display: a #GdkDisplay
*
* This function recomputes the styles for all widgets under a particular
* #GdkDisplay. 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.
**/
void
gtk_style_context_reset_widgets (GdkDisplay *display)
{
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_display (list->data) == display)
gtk_widget_reset_style (list->data);
g_object_unref (list->data);
}
g_list_free (toplevels);
}
/**
* gtk_style_context_add_provider_for_display:
* @display: a #GdkDisplay
* @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 @display, which will be used
* in style construction for all #GtkStyleContexts under @display.
*
* 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.
**/
void
gtk_style_context_add_provider_for_display (GdkDisplay *display,
GtkStyleProvider *provider,
guint priority)
{
GtkStyleCascade *cascade;
g_return_if_fail (GDK_IS_DISPLAY (display));
g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
g_return_if_fail (!GTK_IS_SETTINGS (provider) || _gtk_settings_get_display (GTK_SETTINGS (provider)) == display);
cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display), 1);
_gtk_style_cascade_add_provider (cascade, provider, priority);
}
/**
* gtk_style_context_remove_provider_for_display:
* @display: a #GdkDisplay
* @provider: a #GtkStyleProvider
*
* Removes @provider from the global style providers list in @display.
**/
void
gtk_style_context_remove_provider_for_display (GdkDisplay *display,
GtkStyleProvider *provider)
{
GtkStyleCascade *cascade;
g_return_if_fail (GDK_IS_DISPLAY (display));
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_display (display), 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
* @value: (out) (transfer full): return location for the style property value
*
* Gets a style property from @context for the current 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.
*
* When @value is no longer needed, g_value_unset() must be called
* to free any allocated memory.
**/
void
gtk_style_context_get_property (GtkStyleContext *context,
const gchar *property,
GValue *value)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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;
}
_gtk_style_property_query (prop,
value,
gtk_style_context_query_func,
gtk_css_node_get_style (priv->cssnode));
}
/**
* gtk_style_context_get_valist:
* @context: a #GtkStyleContext
* @first_property_name: Name of the first property
* @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.
*
* As with g_object_get(), a copy is made of the property contents for
* pointer-valued properties, and the caller is responsible for freeing the
* memory in the appropriate manner for the type. For example, by calling
* g_free() or g_object_unref(). Non-pointer-valued properties, such as
* integers, are returned by value and do not need to be freed.
*/
void
gtk_style_context_get_valist (GtkStyleContext *context,
const char *first_property_name,
va_list args)
{
const gchar *property_name;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (first_property_name != NULL);
property_name = first_property_name;
while (property_name)
{
gchar *error = NULL;
GValue value = G_VALUE_INIT;
gtk_style_context_get_property (context,
property_name,
&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
* @first_property_name: Name of the first property
* @...: 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.
*
* As with g_object_get(), a copy is made of the property contents for
* pointer-valued properties, and the caller is responsible for freeing the
* memory in the appropriate manner for the type. For example, by calling
* g_free() or g_object_unref(). Non-pointer-valued properties, such as
* integers, are returned by value and do not need to be freed.
*/
void
gtk_style_context_get (GtkStyleContext *context,
const char *first_property_name,
...)
{
va_list args;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (first_property_name != NULL);
va_start (args, first_property_name);
gtk_style_context_get_valist (context, first_property_name, 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)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_node_set_id (priv->cssnode, id);
}
/*
* gtk_style_context_get_id:
* @context: a #GtkStyleContext
*
* Returns the CSS ID used when obtaining style information.
*
* Returns: (nullable): the ID or %NULL if no ID is set.
**/
const char *
gtk_style_context_get_id (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return gtk_css_node_get_id (priv->cssnode);
}
/**
* gtk_style_context_set_state:
* @context: a #GtkStyleContext
* @flags: state to represent
*
* Sets the state to be used for style matching.
**/
void
gtk_style_context_set_state (GtkStyleContext *context,
GtkStateFlags flags)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_css_node_set_state (priv->cssnode, flags);
}
/**
* 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
**/
GtkStateFlags
gtk_style_context_get_state (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0);
return gtk_css_node_get_state (priv->cssnode);
}
/**
* gtk_style_context_set_scale:
* @context: a #GtkStyleContext
* @scale: scale
*
* Sets the scale to use when getting image assets for the style.
**/
void
gtk_style_context_set_scale (GtkStyleContext *context,
gint scale)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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_display (priv->display),
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
**/
gint
gtk_style_context_get_scale (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0);
return _gtk_style_cascade_get_scale (priv->cascade);
}
/**
* 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.
**/
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
**/
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.
**/
void
gtk_style_context_set_parent (GtkStyleContext *context,
GtkStyleContext *parent)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (parent == NULL || GTK_IS_STYLE_CONTEXT (parent));
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
**/
GtkStyleContext *
gtk_style_context_get_parent (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return 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 = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GTK_IS_CSS_NODE (node));
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 = gtk_style_context_get_instance_private (context);
GtkCssNode *cssnode;
/* 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.
**/
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().
**/
void
gtk_style_context_restore (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
if (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:
*
* |[ <!-- language="CSS" -->
* entry.search { ... }
* ]|
*
* While any widget defining a “search” class would be
* matched by:
* |[ <!-- language="CSS" -->
* .search { ... }
* ]|
**/
void
gtk_style_context_add_class (GtkStyleContext *context,
const gchar *class_name)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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 (priv->cssnode, class_quark);
}
/**
* gtk_style_context_remove_class:
* @context: a #GtkStyleContext
* @class_name: class name to remove
*
* Removes @class_name from @context.
**/
void
gtk_style_context_remove_class (GtkStyleContext *context,
const gchar *class_name)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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 (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
**/
gboolean
gtk_style_context_has_class (GtkStyleContext *context,
const gchar *class_name)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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 (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.
**/
GList *
gtk_style_context_list_classes (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (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 (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;
}
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);
}
/**
* gtk_style_context_set_display:
* @context: a #GtkStyleContext
* @display: a #GdkDisplay
*
* Attaches @context to the given display.
*
* The display is used to add style information from “global” style
* providers, such as the display's #GtkSettings instance.
*
* If you are using a #GtkStyleContext returned from
* gtk_widget_get_style_context(), you do not need to
* call this yourself.
**/
void
gtk_style_context_set_display (GtkStyleContext *context,
GdkDisplay *display)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
GtkStyleCascade *display_cascade;
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (GDK_IS_DISPLAY (display));
if (priv->display == display)
return;
if (gtk_style_context_has_custom_cascade (context))
{
display_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display), 1);
_gtk_style_cascade_set_parent (priv->cascade, display_cascade);
}
else
{
display_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display),
_gtk_style_cascade_get_scale (priv->cascade));
gtk_style_context_set_cascade (context, display_cascade);
}
priv->display = display;
g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_DISPLAY]);
}
/**
* gtk_style_context_get_display:
* @context: a #GtkStyleContext
*
* Returns the #GdkDisplay to which @context is attached.
*
* Returns: (transfer none): a #GdkDisplay.
**/
GdkDisplay *
gtk_style_context_get_display (GtkStyleContext *context)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
return priv->display;
}
static gboolean
gtk_style_context_resolve_color (GtkStyleContext *context,
GtkCssValue *color,
GdkRGBA *result)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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 (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)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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_get_color (GTK_STYLE_PROVIDER (priv->cascade), color_name);
if (value == NULL)
return FALSE;
return gtk_style_context_resolve_color (context, value, color);
}
static GtkCssStyleChange magic_number;
void
gtk_style_context_validate (GtkStyleContext *context,
GtkCssStyleChange *change)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
/* 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);
priv->invalidating_context = NULL;
}
/**
* gtk_style_context_get_color:
* @context: a #GtkStyleContext
* @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.
**/
void
gtk_style_context_get_color (GtkStyleContext *context,
GdkRGBA *color)
{
GdkRGBA *c;
g_return_if_fail (color != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
gtk_style_context_get (context,
"color", &c,
NULL);
*color = *c;
gdk_rgba_free (c);
}
/**
* gtk_style_context_get_border:
* @context: a #GtkStyleContext
* @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.
**/
void
gtk_style_context_get_border (GtkStyleContext *context,
GtkBorder *border)
{
GtkCssStyle *style;
double top, left, bottom, right;
g_return_if_fail (border != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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_get_padding:
* @context: a #GtkStyleContext
* @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.
**/
void
gtk_style_context_get_padding (GtkStyleContext *context,
GtkBorder *padding)
{
GtkCssStyle *style;
double top, left, bottom, right;
g_return_if_fail (padding != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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_get_margin:
* @context: a #GtkStyleContext
* @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.
**/
void
gtk_style_context_get_margin (GtkStyleContext *context,
GtkBorder *margin)
{
GtkCssStyle *style;
double top, left, bottom, right;
g_return_if_fail (margin != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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;
}
void
_gtk_style_context_get_cursor_color (GtkStyleContext *context,
GdkRGBA *primary_color,
GdkRGBA *secondary_color)
{
GdkRGBA *pc, *sc;
gtk_style_context_get (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;
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);
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);
}
static void
get_insertion_cursor_bounds (gdouble height,
PangoDirection direction,
gboolean draw_arrow,
graphene_rect_t *bounds)
{
gint stem_width;
gint offset;
stem_width = height * CURSOR_ASPECT_RATIO + 1;
if (direction == PANGO_DIRECTION_LTR)
offset = stem_width / 2;
else
offset = stem_width - stem_width / 2;
if (draw_arrow)
{
if (direction == PANGO_DIRECTION_LTR)
{
graphene_rect_init (bounds,
- offset, 0,
2 * stem_width + 1, height);
}
else
{
graphene_rect_init (bounds,
- offset - stem_width - 2, 0,
2 * stem_width + 2, height);
}
}
else
{
graphene_rect_init (bounds,
- offset, 0,
stem_width, height);
}
}
static void
snapshot_insertion_cursor (GtkSnapshot *snapshot,
GtkStyleContext *context,
gdouble height,
gboolean is_primary,
PangoDirection direction,
gboolean draw_arrow)
{
if (draw_arrow)
{
cairo_t *cr;
graphene_rect_t bounds;
get_insertion_cursor_bounds (height, direction, draw_arrow, &bounds);
cr = gtk_snapshot_append_cairo (snapshot, &bounds);
draw_insertion_cursor (context, cr, 0, 0, height, is_primary, direction, draw_arrow);
cairo_destroy (cr);
}
else
{
GdkRGBA primary_color;
GdkRGBA secondary_color;
int stem_width;
int offset;
_gtk_style_context_get_cursor_color (context, &primary_color, &secondary_color);
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;
gtk_snapshot_append_color (snapshot,
is_primary ? &primary_color : &secondary_color,
&GRAPHENE_RECT_INIT (- offset, 0, stem_width, height));
}
}
/**
* 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.
**/
void
gtk_render_insertion_cursor (GtkStyleContext *context,
cairo_t *cr,
gdouble x,
gdouble y,
PangoLayout *layout,
int index,
PangoDirection direction)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
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);
g_object_get (gtk_settings_get_for_display (priv->display),
"gtk-split-cursor", &split_cursor,
NULL);
keymap_direction = gdk_keymap_get_direction (gdk_display_get_keymap (priv->display));
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_snapshot_render_insertion_cursor:
* @snapshot: snapshot to render to
* @context: a #GtkStyleContext
* @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 using @snapshot at the specified index of @layout.
**/
void
gtk_snapshot_render_insertion_cursor (GtkSnapshot *snapshot,
GtkStyleContext *context,
gdouble x,
gdouble y,
PangoLayout *layout,
int index,
PangoDirection direction)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
gboolean split_cursor;
PangoRectangle strong_pos, weak_pos;
PangoRectangle *cursor1, *cursor2;
PangoDirection keymap_direction;
PangoDirection direction2;
g_return_if_fail (snapshot != NULL);
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
g_return_if_fail (PANGO_IS_LAYOUT (layout));
g_return_if_fail (index >= 0);
g_object_get (gtk_settings_get_for_display (priv->display),
"gtk-split-cursor", &split_cursor,
NULL);
keymap_direction = gdk_keymap_get_direction (gdk_display_get_keymap (priv->display));
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;
}
gtk_snapshot_save (snapshot);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x + PANGO_PIXELS (cursor1->x), y + PANGO_PIXELS (cursor1->y)));
snapshot_insertion_cursor (snapshot,
context,
PANGO_PIXELS (cursor1->height),
TRUE,
direction,
direction2 != PANGO_DIRECTION_NEUTRAL);
gtk_snapshot_restore (snapshot);
if (direction2 != PANGO_DIRECTION_NEUTRAL)
{
gtk_snapshot_save (snapshot);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x + PANGO_PIXELS (cursor2->x), y + PANGO_PIXELS (cursor2->y)));
snapshot_insertion_cursor (snapshot,
context,
PANGO_PIXELS (cursor2->height),
FALSE,
direction2,
TRUE);
gtk_snapshot_restore (snapshot);
}
}
/**
* 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)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
if (priv->invalidating_context == &magic_number)
return NULL;
return priv->invalidating_context;
}
PangoAttrList *
_gtk_style_context_get_pango_attributes (GtkStyleContext *context)
{
return gtk_css_style_get_pango_attributes (gtk_style_context_lookup_style (context));
}
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)
{
GdkRGBA *bg;
GdkRGBA color;
gchar *value;
gtk_style_context_get (context, "background-color", &bg, NULL);
value = g_strdup_printf ("%u,%u,%u",
(guint) ceil (bg->red * 65536 - bg->red),
(guint) ceil (bg->green * 65536 - bg->green),
(guint) ceil (bg->blue * 65536 - bg->blue));
attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_COLOR, value);
g_free (value);
gdk_rgba_free (bg);
gtk_style_context_get_color (context, &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;
}
/**
* GtkStyleContextPrintFlags:
* @GTK_STYLE_CONTEXT_PRINT_NONE: Default value.
* @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
*/
char *
gtk_style_context_to_string (GtkStyleContext *context,
GtkStyleContextPrintFlags flags)
{
GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context);
GString *string;
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
string = g_string_new ("");
gtk_css_node_print (priv->cssnode, flags, string, 0);
return g_string_free (string, FALSE);
}
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