2 * Copyright © 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 2.1 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 "gtkcsscustompropertyprivate.h"
26 #include "gtkcssstylefuncsprivate.h"
27 #include "gtkthemingengine.h"
29 G_DEFINE_TYPE (GtkCssCustomProperty, _gtk_css_custom_property, GTK_TYPE_CSS_STYLE_PROPERTY)
32 gtk_css_custom_property_get_specified_type (GParamSpec *pspec)
34 if (pspec->value_type == GDK_TYPE_RGBA ||
35 pspec->value_type == GDK_TYPE_COLOR)
36 return GTK_TYPE_SYMBOLIC_COLOR;
38 return pspec->value_type;
42 gtk_css_custom_property_parse_value (GtkStyleProperty *property,
46 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (property);
47 GValue value = G_VALUE_INIT;
51 if (custom->property_parse_func)
56 g_value_init (&value, _gtk_style_property_get_value_type (property));
58 value_str = _gtk_css_parser_read_value (parser);
59 if (value_str != NULL)
61 success = (* custom->property_parse_func) (value_str, &value, &error);
69 g_value_init (&value, gtk_css_custom_property_get_specified_type (custom->pspec));
71 success = _gtk_css_style_parse_value (&value, parser, base);
76 g_value_unset (&value);
80 result = _gtk_css_value_new_from_gvalue (&value);
81 g_value_unset (&value);
87 _gtk_css_custom_property_class_init (GtkCssCustomPropertyClass *klass)
89 GtkStylePropertyClass *property_class = GTK_STYLE_PROPERTY_CLASS (klass);
91 property_class->parse_value = gtk_css_custom_property_parse_value;
95 gtk_css_custom_property_compute_value (GtkCssStyleProperty *property,
96 GtkStyleContext *context,
97 GtkCssValue *specified)
99 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (property);
101 return _gtk_css_style_compute_value (context, custom->pspec->value_type, specified);
105 _gtk_css_custom_property_init (GtkCssCustomProperty *custom)
107 GtkCssStyleProperty *style = GTK_CSS_STYLE_PROPERTY (custom);
109 style->compute_value = gtk_css_custom_property_compute_value;
113 gtk_css_custom_property_create_initial_value (GParamSpec *pspec)
115 GValue value = G_VALUE_INIT;
118 g_value_init (&value, pspec->value_type);
120 if (pspec->value_type == GTK_TYPE_THEMING_ENGINE)
121 g_value_set_object (&value, gtk_theming_engine_load (NULL));
122 else if (pspec->value_type == PANGO_TYPE_FONT_DESCRIPTION)
123 g_value_take_boxed (&value, pango_font_description_from_string ("Sans 10"));
124 else if (pspec->value_type == GDK_TYPE_RGBA)
127 gdk_rgba_parse (&color, "pink");
128 g_value_set_boxed (&value, &color);
130 else if (pspec->value_type == GDK_TYPE_COLOR)
133 gdk_color_parse ("pink", &color);
134 g_value_set_boxed (&value, &color);
136 else if (pspec->value_type == GTK_TYPE_BORDER)
138 g_value_take_boxed (&value, gtk_border_new ());
141 g_param_value_set_default (pspec, &value);
143 result = _gtk_css_value_new_from_gvalue (&value);
144 g_value_unset (&value);
149 /* Property registration functions */
152 * gtk_theming_engine_register_property: (skip)
153 * @name_space: namespace for the property name
154 * @parse_func: parsing function to use, or %NULL
155 * @pspec: the #GParamSpec for the new property
157 * Registers a property so it can be used in the CSS file format,
158 * on the CSS file the property will look like
159 * "-${@name_space}-${property_name}". being
160 * ${property_name} the given to @pspec. @name_space will usually
161 * be the theme engine name.
163 * For any type a @parse_func may be provided, being this function
164 * used for turning any property value (between ':' and ';') in
165 * CSS to the #GValue needed. For basic types there is already
166 * builtin parsing support, so %NULL may be provided for these
170 * Engines must ensure property registration happens exactly once,
171 * usually GTK+ deals with theming engines as singletons, so this
172 * should be guaranteed to happen once, but bear this in mind
173 * when creating #GtkThemeEngine<!-- -->s yourself.
177 * In order to make use of the custom registered properties in
178 * the CSS file, make sure the engine is loaded first by specifying
179 * the engine property, either in a previous rule or within the same
183 * engine: someengine;
184 * -SomeEngine-custom-property: 2;
192 gtk_theming_engine_register_property (const gchar *name_space,
193 GtkStylePropertyParser parse_func,
196 GtkCssCustomProperty *node;
197 GtkCssValue *initial;
200 g_return_if_fail (name_space != NULL);
201 g_return_if_fail (strchr (name_space, ' ') == NULL);
202 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
204 name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
206 /* This also initializes the default properties */
207 if (_gtk_style_property_lookup (pspec->name))
209 g_warning ("a property with name '%s' already exists", name);
214 initial = gtk_css_custom_property_create_initial_value (pspec);
216 node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
217 "initial-value", initial,
219 "computed-type", pspec->value_type,
220 "value-type", pspec->value_type,
223 node->property_parse_func = parse_func;
225 _gtk_css_value_unref (initial);
230 * gtk_style_properties_register_property: (skip)
231 * @parse_func: parsing function to use, or %NULL
232 * @pspec: the #GParamSpec for the new property
234 * Registers a property so it can be used in the CSS file format.
235 * This function is the low-level equivalent of
236 * gtk_theming_engine_register_property(), if you are implementing
237 * a theming engine, you want to use that function instead.
242 gtk_style_properties_register_property (GtkStylePropertyParser parse_func,
245 GtkCssCustomProperty *node;
246 GtkCssValue *initial;
248 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
250 /* This also initializes the default properties */
251 if (_gtk_style_property_lookup (pspec->name))
253 g_warning ("a property with name '%s' already exists", pspec->name);
257 initial = gtk_css_custom_property_create_initial_value (pspec);
259 node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
260 "initial-value", initial,
262 "computed-type", pspec->value_type,
263 "value-type", pspec->value_type,
266 node->property_parse_func = parse_func;
268 _gtk_css_value_unref (initial);
272 * gtk_style_properties_lookup_property: (skip)
273 * @property_name: property name to look up
274 * @parse_func: (out): return location for the parse function
275 * @pspec: (out) (transfer none): return location for the #GParamSpec
277 * Returns %TRUE if a property has been registered, if @pspec or
278 * @parse_func are not %NULL, the #GParamSpec and parsing function
279 * will be respectively returned.
281 * Returns: %TRUE if the property is registered, %FALSE otherwise
286 gtk_style_properties_lookup_property (const gchar *property_name,
287 GtkStylePropertyParser *parse_func,
290 GtkStyleProperty *node;
291 gboolean found = FALSE;
293 g_return_val_if_fail (property_name != NULL, FALSE);
295 node = _gtk_style_property_lookup (property_name);
297 if (GTK_IS_CSS_CUSTOM_PROPERTY (node))
299 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (node);
302 *pspec = custom->pspec;
305 *parse_func = custom->property_parse_func;