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 "gtkcssinheritvalueprivate.h"
25 #include "gtkcssinitialvalueprivate.h"
26 #include "gtkcssstylepropertyprivate.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_ptr_array_unref (values->values);
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_ensure_array (GtkCssComputedValues *values,
80 if (values->values == NULL)
81 values->values = g_ptr_array_new_with_free_func ((GDestroyNotify)_gtk_css_value_unref);
82 if (at_least_size > values->values->len)
83 g_ptr_array_set_size (values->values, at_least_size);
87 _gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
88 GtkStyleContext *context,
90 GtkCssValue *specified,
91 GtkCssSection *section)
93 GtkCssStyleProperty *prop;
94 GtkStyleContext *parent;
96 g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
97 g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
99 prop = _gtk_css_style_property_lookup_by_id (id);
100 parent = gtk_style_context_get_parent (context);
102 gtk_css_computed_values_ensure_array (values, id + 1);
104 /* http://www.w3.org/TR/css3-cascade/#cascade
105 * Then, for every element, the value for each property can be found
106 * by following this pseudo-algorithm:
107 * 1) Identify all declarations that apply to the element
109 if (specified != NULL)
111 if (_gtk_css_value_is_inherit (specified))
113 /* 3) if the value of the winning declaration is ‘inherit’,
114 * the inherited value (see below) becomes the specified value.
118 else if (_gtk_css_value_is_initial (specified))
120 /* if the value of the winning declaration is ‘initial’,
121 * the initial value (see below) becomes the specified value.
123 specified = _gtk_css_style_property_get_initial_value (prop);
126 /* 2) If the cascading process (described below) yields a winning
127 * declaration and the value of the winning declaration is not
128 * ‘initial’ or ‘inherit’, the value of the winning declaration
129 * becomes the specified value.
134 if (_gtk_css_style_property_is_inherit (prop))
136 /* 4) if the property is inherited, the inherited value becomes
137 * the specified value.
143 /* 5) Otherwise, the initial value becomes the specified value.
145 specified = _gtk_css_style_property_get_initial_value (prop);
149 if (specified == NULL && parent == NULL)
151 /* If the ‘inherit’ value is set on the root element, the property is
152 * assigned its initial value. */
153 specified = _gtk_css_style_property_get_initial_value (prop);
158 g_ptr_array_index (values->values, id) =
159 _gtk_css_style_property_compute_value (prop,
165 GtkCssValue *parent_value;
166 /* Set NULL here and do the inheritance upon lookup? */
167 parent_value = _gtk_style_context_peek_property (parent, id);
169 g_ptr_array_index (values->values, id) = _gtk_css_value_ref (parent_value);
174 if (values->sections == NULL)
175 values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
176 if (values->sections->len <= id)
177 g_ptr_array_set_size (values->sections, id + 1);
179 g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
184 _gtk_css_computed_values_set_value (GtkCssComputedValues *values,
187 GtkCssSection *section)
189 g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
191 gtk_css_computed_values_ensure_array (values, id + 1);
193 if (g_ptr_array_index (values->values, id))
194 _gtk_css_value_unref (g_ptr_array_index (values->values, id));
195 g_ptr_array_index (values->values, id) = _gtk_css_value_ref (value);
199 if (values->sections == NULL)
200 values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
201 if (values->sections->len <= id)
202 g_ptr_array_set_size (values->sections, id + 1);
204 g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
209 _gtk_css_computed_values_get_value (GtkCssComputedValues *values,
212 g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
214 if (values->values == NULL ||
215 id >= values->values->len)
218 return g_ptr_array_index (values->values, id);
222 _gtk_css_computed_values_get_section (GtkCssComputedValues *values,
225 g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
227 if (values->sections == NULL ||
228 id >= values->sections->len)
231 return g_ptr_array_index (values->sections, id);
235 _gtk_css_computed_values_get_difference (GtkCssComputedValues *values,
236 GtkCssComputedValues *other)
241 len = MIN (values->values->len, other->values->len);
242 result = _gtk_bitmask_new ();
243 if (values->values->len != other->values->len)
244 result = _gtk_bitmask_invert_range (result, len, MAX (values->values->len, other->values->len));
246 for (i = 0; i < len; i++)
248 if (!_gtk_css_value_equal (g_ptr_array_index (values->values, i),
249 g_ptr_array_index (other->values, i)))
250 result = _gtk_bitmask_set (result, i, TRUE);