1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 2011 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
20 #include "gtkcssvalueprivate.h"
22 #include "gtkcsscomputedvaluesprivate.h"
23 #include "gtkstyleproviderprivate.h"
29 G_DEFINE_BOXED_TYPE (GtkCssValue, _gtk_css_value, _gtk_css_value_ref, _gtk_css_value_unref)
32 _gtk_css_value_alloc (const GtkCssValueClass *klass,
37 value = g_slice_alloc0 (size);
46 _gtk_css_value_ref (GtkCssValue *value)
48 g_return_val_if_fail (value != NULL, NULL);
50 g_atomic_int_add (&value->ref_count, 1);
56 _gtk_css_value_unref (GtkCssValue *value)
61 if (!g_atomic_int_dec_and_test (&value->ref_count))
64 value->class->free (value);
68 * _gtk_css_value_compute:
69 * @value: the value to compute from
70 * @property_id: the ID of the property to compute
71 * @provider: Style provider for looking up extra information
72 * @values: values to compute for
73 * @parent_values: parent values to use for inherited values
74 * @dependencies: (out) (allow-none): Set to the dependencies of the
75 * computed values that indicate when this value needs to be
78 * Converts the specified @value into the computed value for the CSS
79 * property given by @property_id using the information in @context.
80 * This step is explained in detail in
81 * <ulink url="http://www.w3.org/TR/css3-cascade/#computed>
82 * the CSS documentation</ulink>.
84 * Returns: the computed value
87 _gtk_css_value_compute (GtkCssValue *value,
89 GtkStyleProviderPrivate *provider,
90 GtkCssComputedValues *values,
91 GtkCssComputedValues *parent_values,
92 GtkCssDependencies *dependencies)
94 GtkCssDependencies fallback;
96 g_return_val_if_fail (value != NULL, NULL);
97 g_return_val_if_fail (GTK_IS_STYLE_PROVIDER_PRIVATE (provider), NULL);
98 g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
99 g_return_val_if_fail (parent_values == NULL || GTK_IS_CSS_COMPUTED_VALUES (parent_values), NULL);
101 if (dependencies == NULL)
102 dependencies = &fallback;
105 return value->class->compute (value, property_id, provider, values, parent_values, dependencies);
109 _gtk_css_value_equal (const GtkCssValue *value1,
110 const GtkCssValue *value2)
112 g_return_val_if_fail (value1 != NULL, FALSE);
113 g_return_val_if_fail (value2 != NULL, FALSE);
115 if (value1 == value2)
118 if (value1->class != value2->class)
121 return value1->class->equal (value1, value2);
125 _gtk_css_value_equal0 (const GtkCssValue *value1,
126 const GtkCssValue *value2)
128 /* Inclues both values being NULL */
129 if (value1 == value2)
132 if (value1 == NULL || value2 == NULL)
135 return _gtk_css_value_equal (value1, value2);
139 _gtk_css_value_transition (GtkCssValue *start,
144 g_return_val_if_fail (start != NULL, FALSE);
145 g_return_val_if_fail (end != NULL, FALSE);
147 if (start->class != end->class)
150 return start->class->transition (start, end, property_id, progress);
154 _gtk_css_value_to_string (const GtkCssValue *value)
158 g_return_val_if_fail (value != NULL, NULL);
160 string = g_string_new (NULL);
161 _gtk_css_value_print (value, string);
162 return g_string_free (string, FALSE);
166 * _gtk_css_value_print:
167 * @value: the value to print
168 * @string: the string to print to
170 * Prints @value to the given @string in CSS format. The @value must be a
171 * valid specified value as parsed using the parse functions or as assigned
172 * via _gtk_style_property_assign().
175 _gtk_css_value_print (const GtkCssValue *value,
178 g_return_if_fail (value != NULL);
179 g_return_if_fail (string != NULL);
181 value->class->print (value, string);