2 * Copyright © 2012 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 2.1 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/>.
17 * Authors: Benjamin Otte <otte@gnome.org>
22 #include "gtkcsscomputedvaluesprivate.h"
24 #include "gtkcssstylepropertyprivate.h"
25 #include "gtkcsstypesprivate.h"
26 #include "gtkprivatetypebuiltins.h"
28 G_DEFINE_TYPE (GtkCssComputedValues, _gtk_css_computed_values, G_TYPE_OBJECT)
31 gtk_css_computed_values_dispose (GObject *object)
33 GtkCssComputedValues *values = GTK_CSS_COMPUTED_VALUES (object);
37 g_array_free (values->values, TRUE);
38 values->values = NULL;
42 g_ptr_array_unref (values->sections);
43 values->sections = NULL;
46 G_OBJECT_CLASS (_gtk_css_computed_values_parent_class)->dispose (object);
50 _gtk_css_computed_values_class_init (GtkCssComputedValuesClass *klass)
52 GObjectClass *object_class = G_OBJECT_CLASS (klass);
54 object_class->dispose = gtk_css_computed_values_dispose;
58 _gtk_css_computed_values_init (GtkCssComputedValues *computed_values)
63 GtkCssComputedValues *
64 _gtk_css_computed_values_new (void)
66 return g_object_new (GTK_TYPE_CSS_COMPUTED_VALUES, NULL);
70 maybe_unref_section (gpointer section)
73 gtk_css_section_unref (section);
77 _gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
78 GtkStyleContext *context,
80 const GValue *specified,
81 GtkCssSection *section)
83 GtkCssStyleProperty *prop;
84 GtkStyleContext *parent;
86 g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
87 g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
88 g_return_if_fail (specified == NULL || G_IS_VALUE (specified));
90 prop = _gtk_css_style_property_lookup_by_id (id);
91 parent = gtk_style_context_get_parent (context);
93 if (values->values == NULL)
95 values->values = g_array_new (FALSE, TRUE, sizeof (GValue));
96 g_array_set_clear_func (values->values, (GDestroyNotify) g_value_unset);
98 if (id <= values->values->len)
99 g_array_set_size (values->values, id + 1);
101 /* http://www.w3.org/TR/css3-cascade/#cascade
102 * Then, for every element, the value for each property can be found
103 * by following this pseudo-algorithm:
104 * 1) Identify all declarations that apply to the element
106 if (specified != NULL)
108 if (G_VALUE_HOLDS (specified, GTK_TYPE_CSS_SPECIAL_VALUE))
110 switch (g_value_get_enum (specified))
112 case GTK_CSS_INHERIT:
113 /* 3) if the value of the winning declaration is ‘inherit’,
114 * the inherited value (see below) becomes the specified value.
118 case GTK_CSS_INITIAL:
119 /* if the value of the winning declaration is ‘initial’,
120 * the initial value (see below) becomes the specified value.
122 specified = _gtk_css_style_property_get_initial_value (prop);
125 /* This is part of (2) above */
130 /* 2) If the cascading process (described below) yields a winning
131 * declaration and the value of the winning declaration is not
132 * ‘initial’ or ‘inherit’, the value of the winning declaration
133 * becomes the specified value.
138 if (_gtk_css_style_property_is_inherit (prop))
140 /* 4) if the property is inherited, the inherited value becomes
141 * the specified value.
147 /* 5) Otherwise, the initial value becomes the specified value.
149 specified = _gtk_css_style_property_get_initial_value (prop);
153 if (specified == NULL && parent == NULL)
155 /* If the ‘inherit’ value is set on the root element, the property is
156 * assigned its initial value. */
157 specified = _gtk_css_style_property_get_initial_value (prop);
162 _gtk_css_style_property_compute_value (prop,
163 &g_array_index (values->values, GValue, id),
169 const GValue *parent_value;
170 GValue *value = &g_array_index (values->values, GValue, id);
171 /* Set NULL here and do the inheritance upon lookup? */
172 parent_value = _gtk_style_context_peek_property (parent,
173 _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)));
174 g_value_init (value, G_VALUE_TYPE (parent_value));
175 g_value_copy (parent_value, value);
180 if (values->sections == NULL)
181 values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
182 if (values->sections->len <= id)
183 g_ptr_array_set_size (values->sections, id + 1);
185 g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
190 _gtk_css_computed_values_set_value (GtkCssComputedValues *values,
193 GtkCssSection *section)
197 g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
198 g_return_if_fail (value == NULL || G_IS_VALUE (value));
200 if (values->values == NULL)
202 values->values = g_array_new (FALSE, TRUE, sizeof (GValue));
203 g_array_set_clear_func (values->values, (GDestroyNotify) g_value_unset);
205 if (id <= values->values->len)
206 g_array_set_size (values->values, id + 1);
209 set = &g_array_index (values->values, GValue, id);
210 g_value_init (set, G_VALUE_TYPE (value));
211 g_value_copy (value, set);
215 if (values->sections == NULL)
216 values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
217 if (values->sections->len <= id)
218 g_ptr_array_set_size (values->sections, id + 1);
220 g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
225 _gtk_css_computed_values_get_value (GtkCssComputedValues *values,
230 g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
232 if (values->values == NULL ||
233 id >= values->values->len)
236 v = &g_array_index (values->values, GValue, id);
244 _gtk_css_computed_values_get_value_by_name (GtkCssComputedValues *values,
247 GtkStyleProperty *prop;
249 g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
250 g_return_val_if_fail (name != NULL, NULL);
252 prop = _gtk_style_property_lookup (name);
253 g_assert (GTK_IS_CSS_STYLE_PROPERTY (prop));
255 return _gtk_css_computed_values_get_value (values, _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)));
259 _gtk_css_computed_values_get_section (GtkCssComputedValues *values,
262 g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
264 if (values->sections == NULL ||
265 id >= values->sections->len)
268 return g_ptr_array_index (values->sections, id);