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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 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 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 "gtkcssvalueprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
};
G_DEFINE_BOXED_TYPE (GtkCssValue, _gtk_css_value, _gtk_css_value_ref, _gtk_css_value_unref)
GtkCssValue *
_gtk_css_value_alloc (const GtkCssValueClass *klass,
gsize size)
{
GtkCssValue *value;
value = g_slice_alloc0 (size);
value->class = klass;
value->ref_count = 1;
return value;
}
GtkCssValue *
_gtk_css_value_ref (GtkCssValue *value)
{
g_return_val_if_fail (value != NULL, NULL);
g_atomic_int_add (&value->ref_count, 1);
return value;
}
void
_gtk_css_value_unref (GtkCssValue *value)
{
if (value == NULL)
return;
if (!g_atomic_int_dec_and_test (&value->ref_count))
return;
value->class->free (value);
}
/**
* _gtk_css_value_compute:
* @value: the value to compute from
* @property_id: the ID of the property to compute
* @context: the context to use for resolving
* @dependencies: (out) (allow-none): Set to the dependencies of the
* computed values that indicate when this value needs to be
* recomputed and how.
*
* Converts the specified @value into the computed value for the CSS
* property given by @property_id using the information in @context.
* This step is explained in detail in
* <ulink url="http://www.w3.org/TR/css3-cascade/#computed>
* the CSS documentation</ulink>.
*
* Returns: the computed value
**/
GtkCssValue *
_gtk_css_value_compute (GtkCssValue *value,
guint property_id,
GtkStyleContext *context,
GtkCssDependencies *dependencies)
{
GtkCssDependencies fallback;
g_return_val_if_fail (value != NULL, NULL);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
if (dependencies == NULL)
dependencies = &fallback;
*dependencies = 0;
return value->class->compute (value, property_id, context, dependencies);
}
gboolean
_gtk_css_value_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
g_return_val_if_fail (value1 != NULL, FALSE);
g_return_val_if_fail (value2 != NULL, FALSE);
if (value1 == value2)
return TRUE;
if (value1->class != value2->class)
return FALSE;
return value1->class->equal (value1, value2);
}
gboolean
_gtk_css_value_equal0 (const GtkCssValue *value1,
const GtkCssValue *value2)
{
/* Inclues both values being NULL */
if (value1 == value2)
return TRUE;
if (value1 == NULL || value2 == NULL)
return FALSE;
return _gtk_css_value_equal (value1, value2);
}
GtkCssValue *
_gtk_css_value_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
g_return_val_if_fail (start != NULL, FALSE);
g_return_val_if_fail (end != NULL, FALSE);
if (start->class != end->class)
return NULL;
return start->class->transition (start, end, property_id, progress);
}
char *
_gtk_css_value_to_string (const GtkCssValue *value)
{
GString *string;
g_return_val_if_fail (value != NULL, NULL);
string = g_string_new (NULL);
_gtk_css_value_print (value, string);
return g_string_free (string, FALSE);
}
/**
* _gtk_css_value_print:
* @value: the value to print
* @string: the string to print to
*
* Prints @value to the given @string in CSS format. The @value must be a
* valid specified value as parsed using the parse functions or as assigned
* via _gtk_style_property_assign().
**/
void
_gtk_css_value_print (const GtkCssValue *value,
GString *string)
{
g_return_if_fail (value != NULL);
g_return_if_fail (string != NULL);
value->class->print (value, string);
}
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