gtk2/gtk/gtkcsscomputedvalues.c
Benjamin Otte 9b7640b898 styleproperty: Make _gtk_style_property_parse_value() return a CssValue
Also split out initial/inherit handling into a custom GtkCssValue class.
2012-04-17 08:59:11 +02:00

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/*
* Copyright © 2012 Red Hat Inc.
*
* 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 2.1 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/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkcsscomputedvaluesprivate.h"
#include "gtkcssinheritvalueprivate.h"
#include "gtkcssinitialvalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
G_DEFINE_TYPE (GtkCssComputedValues, _gtk_css_computed_values, G_TYPE_OBJECT)
static void
gtk_css_computed_values_dispose (GObject *object)
{
GtkCssComputedValues *values = GTK_CSS_COMPUTED_VALUES (object);
if (values->values)
{
g_ptr_array_unref (values->values);
values->values = NULL;
}
if (values->sections)
{
g_ptr_array_unref (values->sections);
values->sections = NULL;
}
G_OBJECT_CLASS (_gtk_css_computed_values_parent_class)->dispose (object);
}
static void
_gtk_css_computed_values_class_init (GtkCssComputedValuesClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = gtk_css_computed_values_dispose;
}
static void
_gtk_css_computed_values_init (GtkCssComputedValues *computed_values)
{
}
GtkCssComputedValues *
_gtk_css_computed_values_new (void)
{
return g_object_new (GTK_TYPE_CSS_COMPUTED_VALUES, NULL);
}
static void
maybe_unref_section (gpointer section)
{
if (section)
gtk_css_section_unref (section);
}
void
_gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
GtkStyleContext *context,
guint id,
GtkCssValue *specified,
GtkCssSection *section)
{
GtkCssStyleProperty *prop;
GtkStyleContext *parent;
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
prop = _gtk_css_style_property_lookup_by_id (id);
parent = gtk_style_context_get_parent (context);
if (values->values == NULL)
values->values = g_ptr_array_new_with_free_func ((GDestroyNotify)_gtk_css_value_unref);
if (id <= values->values->len)
g_ptr_array_set_size (values->values, id + 1);
/* http://www.w3.org/TR/css3-cascade/#cascade
* Then, for every element, the value for each property can be found
* by following this pseudo-algorithm:
* 1) Identify all declarations that apply to the element
*/
if (specified != NULL)
{
if (_gtk_css_value_is_inherit (specified))
{
/* 3) if the value of the winning declaration is inherit,
* the inherited value (see below) becomes the specified value.
*/
specified = NULL;
}
else if (_gtk_css_value_is_initial (specified))
{
/* if the value of the winning declaration is initial,
* the initial value (see below) becomes the specified value.
*/
specified = _gtk_css_style_property_get_initial_value (prop);
}
/* 2) If the cascading process (described below) yields a winning
* declaration and the value of the winning declaration is not
* initial or inherit, the value of the winning declaration
* becomes the specified value.
*/
}
else
{
if (_gtk_css_style_property_is_inherit (prop))
{
/* 4) if the property is inherited, the inherited value becomes
* the specified value.
*/
specified = NULL;
}
else
{
/* 5) Otherwise, the initial value becomes the specified value.
*/
specified = _gtk_css_style_property_get_initial_value (prop);
}
}
if (specified == NULL && parent == NULL)
{
/* If the inherit value is set on the root element, the property is
* assigned its initial value. */
specified = _gtk_css_style_property_get_initial_value (prop);
}
if (specified)
{
g_ptr_array_index (values->values, id) =
_gtk_css_style_property_compute_value (prop,
context,
specified);
}
else
{
GtkCssValue *parent_value;
/* Set NULL here and do the inheritance upon lookup? */
parent_value = _gtk_style_context_peek_property (parent,
_gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)));
g_ptr_array_index (values->values, id) = _gtk_css_value_ref (parent_value);
}
if (section)
{
if (values->sections == NULL)
values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
if (values->sections->len <= id)
g_ptr_array_set_size (values->sections, id + 1);
g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
}
}
void
_gtk_css_computed_values_set_value (GtkCssComputedValues *values,
guint id,
GtkCssValue *value,
GtkCssSection *section)
{
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
if (values->values == NULL)
values->values = g_ptr_array_new_with_free_func ((GDestroyNotify)_gtk_css_value_unref);
if (id <= values->values->len)
g_ptr_array_set_size (values->values, id + 1);
if (g_ptr_array_index (values->values, id))
_gtk_css_value_unref (g_ptr_array_index (values->values, id));
g_ptr_array_index (values->values, id) = _gtk_css_value_ref (value);
if (section)
{
if (values->sections == NULL)
values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
if (values->sections->len <= id)
g_ptr_array_set_size (values->sections, id + 1);
g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
}
}
GtkCssValue *
_gtk_css_computed_values_get_value (GtkCssComputedValues *values,
guint id)
{
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
if (values->values == NULL ||
id >= values->values->len)
return NULL;
return g_ptr_array_index (values->values, id);
}
GtkCssValue *
_gtk_css_computed_values_get_value_by_name (GtkCssComputedValues *values,
const char *name)
{
GtkStyleProperty *prop;
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
g_return_val_if_fail (name != NULL, NULL);
prop = _gtk_style_property_lookup (name);
g_assert (GTK_IS_CSS_STYLE_PROPERTY (prop));
return _gtk_css_computed_values_get_value (values, _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)));
}
GtkCssSection *
_gtk_css_computed_values_get_section (GtkCssComputedValues *values,
guint id)
{
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
if (values->sections == NULL ||
id >= values->sections->len)
return NULL;
return g_ptr_array_index (values->sections, id);
}