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 "gtkprivate.h"
21 #include "gtkcssvalueprivate.h"
23 #include "gtkcsscomputedvaluesprivate.h"
24 #include "gtkstyleproviderprivate.h"
30 G_DEFINE_BOXED_TYPE (GtkCssValue, _gtk_css_value, _gtk_css_value_ref, _gtk_css_value_unref)
33 _gtk_css_value_alloc (const GtkCssValueClass *klass,
38 value = g_slice_alloc0 (size);
47 _gtk_css_value_ref (GtkCssValue *value)
49 gtk_internal_return_val_if_fail (value != NULL, NULL);
51 g_atomic_int_add (&value->ref_count, 1);
57 _gtk_css_value_unref (GtkCssValue *value)
62 if (!g_atomic_int_dec_and_test (&value->ref_count))
65 value->class->free (value);
69 * _gtk_css_value_compute:
70 * @value: the value to compute from
71 * @property_id: the ID of the property to compute
72 * @provider: Style provider for looking up extra information
73 * @values: values to compute for
74 * @parent_values: parent values to use for inherited values
75 * @dependencies: (out) (allow-none): Set to the dependencies of the
76 * computed values that indicate when this value needs to be
79 * Converts the specified @value into the computed value for the CSS
80 * property given by @property_id using the information in @context.
81 * This step is explained in detail in
82 * <ulink url="http://www.w3.org/TR/css3-cascade/#computed>
83 * the CSS documentation</ulink>.
85 * Returns: the computed value
88 _gtk_css_value_compute (GtkCssValue *value,
90 GtkStyleProviderPrivate *provider,
91 GtkCssComputedValues *values,
92 GtkCssComputedValues *parent_values,
93 GtkCssDependencies *dependencies)
95 GtkCssDependencies fallback;
97 gtk_internal_return_val_if_fail (value != NULL, NULL);
98 gtk_internal_return_val_if_fail (GTK_IS_STYLE_PROVIDER_PRIVATE (provider), NULL);
99 gtk_internal_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
100 gtk_internal_return_val_if_fail (parent_values == NULL || GTK_IS_CSS_COMPUTED_VALUES (parent_values), NULL);
102 if (dependencies == NULL)
103 dependencies = &fallback;
106 return value->class->compute (value, property_id, provider, values, parent_values, dependencies);
110 _gtk_css_value_equal (const GtkCssValue *value1,
111 const GtkCssValue *value2)
113 gtk_internal_return_val_if_fail (value1 != NULL, FALSE);
114 gtk_internal_return_val_if_fail (value2 != NULL, FALSE);
116 if (value1 == value2)
119 if (value1->class != value2->class)
122 return value1->class->equal (value1, value2);
126 _gtk_css_value_equal0 (const GtkCssValue *value1,
127 const GtkCssValue *value2)
129 /* Inclues both values being NULL */
130 if (value1 == value2)
133 if (value1 == NULL || value2 == NULL)
136 return _gtk_css_value_equal (value1, value2);
140 _gtk_css_value_transition (GtkCssValue *start,
145 gtk_internal_return_val_if_fail (start != NULL, FALSE);
146 gtk_internal_return_val_if_fail (end != NULL, FALSE);
148 if (start->class != end->class)
151 return start->class->transition (start, end, property_id, progress);
155 _gtk_css_value_to_string (const GtkCssValue *value)
159 gtk_internal_return_val_if_fail (value != NULL, NULL);
161 string = g_string_new (NULL);
162 _gtk_css_value_print (value, string);
163 return g_string_free (string, FALSE);
167 * _gtk_css_value_print:
168 * @value: the value to print
169 * @string: the string to print to
171 * Prints @value to the given @string in CSS format. The @value must be a
172 * valid specified value as parsed using the parse functions or as assigned
173 * via _gtk_style_property_assign().
176 _gtk_css_value_print (const GtkCssValue *value,
179 gtk_internal_return_if_fail (value != NULL);
180 gtk_internal_return_if_fail (string != NULL);
182 value->class->print (value, string);