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_parse_value (GtkStyleProperty *property,
36 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (property);
37 GValue value = G_VALUE_INIT;
41 if (custom->property_parse_func)
46 g_value_init (&value, _gtk_style_property_get_value_type (property));
48 value_str = _gtk_css_parser_read_value (parser);
49 if (value_str != NULL)
51 success = (* custom->property_parse_func) (value_str, &value, &error);
59 GtkCssStyleProperty *style = GTK_CSS_STYLE_PROPERTY (property);
60 g_value_init (&value, _gtk_css_style_property_get_specified_type (style));
62 success = _gtk_css_style_parse_value (&value, parser, base);
67 g_value_unset (&value);
71 result = _gtk_css_value_new_from_gvalue (&value);
72 g_value_unset (&value);
78 _gtk_css_custom_property_class_init (GtkCssCustomPropertyClass *klass)
80 GtkStylePropertyClass *property_class = GTK_STYLE_PROPERTY_CLASS (klass);
82 property_class->parse_value = gtk_css_custom_property_parse_value;
87 _gtk_css_custom_property_init (GtkCssCustomProperty *custom_property)
92 gtk_css_custom_property_create_initial_value (GParamSpec *pspec)
94 GValue value = G_VALUE_INIT;
97 g_value_init (&value, pspec->value_type);
99 if (pspec->value_type == GTK_TYPE_THEMING_ENGINE)
100 g_value_set_object (&value, gtk_theming_engine_load (NULL));
101 else if (pspec->value_type == PANGO_TYPE_FONT_DESCRIPTION)
102 g_value_take_boxed (&value, pango_font_description_from_string ("Sans 10"));
103 else if (pspec->value_type == GDK_TYPE_RGBA)
106 gdk_rgba_parse (&color, "pink");
107 g_value_set_boxed (&value, &color);
109 else if (pspec->value_type == GDK_TYPE_COLOR)
112 gdk_color_parse ("pink", &color);
113 g_value_set_boxed (&value, &color);
115 else if (pspec->value_type == GTK_TYPE_BORDER)
117 g_value_take_boxed (&value, gtk_border_new ());
120 g_param_value_set_default (pspec, &value);
122 result = _gtk_css_value_new_from_gvalue (&value);
123 g_value_unset (&value);
128 /* Property registration functions */
131 * gtk_theming_engine_register_property: (skip)
132 * @name_space: namespace for the property name
133 * @parse_func: parsing function to use, or %NULL
134 * @pspec: the #GParamSpec for the new property
136 * Registers a property so it can be used in the CSS file format,
137 * on the CSS file the property will look like
138 * "-${@name_space}-${property_name}". being
139 * ${property_name} the given to @pspec. @name_space will usually
140 * be the theme engine name.
142 * For any type a @parse_func may be provided, being this function
143 * used for turning any property value (between ':' and ';') in
144 * CSS to the #GValue needed. For basic types there is already
145 * builtin parsing support, so %NULL may be provided for these
149 * Engines must ensure property registration happens exactly once,
150 * usually GTK+ deals with theming engines as singletons, so this
151 * should be guaranteed to happen once, but bear this in mind
152 * when creating #GtkThemeEngine<!-- -->s yourself.
156 * In order to make use of the custom registered properties in
157 * the CSS file, make sure the engine is loaded first by specifying
158 * the engine property, either in a previous rule or within the same
162 * engine: someengine;
163 * -SomeEngine-custom-property: 2;
171 gtk_theming_engine_register_property (const gchar *name_space,
172 GtkStylePropertyParser parse_func,
175 GtkCssCustomProperty *node;
176 GtkCssValue *initial;
179 g_return_if_fail (name_space != NULL);
180 g_return_if_fail (strchr (name_space, ' ') == NULL);
181 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
183 name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
185 /* This also initializes the default properties */
186 if (_gtk_style_property_lookup (pspec->name))
188 g_warning ("a property with name '%s' already exists", name);
193 initial = gtk_css_custom_property_create_initial_value (pspec);
195 node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
196 "initial-value", initial,
198 "computed-type", pspec->value_type,
199 "value-type", pspec->value_type,
202 node->property_parse_func = parse_func;
204 _gtk_css_value_unref (initial);
209 * gtk_style_properties_register_property: (skip)
210 * @parse_func: parsing function to use, or %NULL
211 * @pspec: the #GParamSpec for the new property
213 * Registers a property so it can be used in the CSS file format.
214 * This function is the low-level equivalent of
215 * gtk_theming_engine_register_property(), if you are implementing
216 * a theming engine, you want to use that function instead.
221 gtk_style_properties_register_property (GtkStylePropertyParser parse_func,
224 GtkCssCustomProperty *node;
225 GtkCssValue *initial;
227 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
229 /* This also initializes the default properties */
230 if (_gtk_style_property_lookup (pspec->name))
232 g_warning ("a property with name '%s' already exists", pspec->name);
236 initial = gtk_css_custom_property_create_initial_value (pspec);
238 node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
239 "initial-value", initial,
241 "computed-type", pspec->value_type,
242 "value-type", pspec->value_type,
245 node->property_parse_func = parse_func;
247 _gtk_css_value_unref (initial);
251 * gtk_style_properties_lookup_property: (skip)
252 * @property_name: property name to look up
253 * @parse_func: (out): return location for the parse function
254 * @pspec: (out) (transfer none): return location for the #GParamSpec
256 * Returns %TRUE if a property has been registered, if @pspec or
257 * @parse_func are not %NULL, the #GParamSpec and parsing function
258 * will be respectively returned.
260 * Returns: %TRUE if the property is registered, %FALSE otherwise
265 gtk_style_properties_lookup_property (const gchar *property_name,
266 GtkStylePropertyParser *parse_func,
269 GtkStyleProperty *node;
270 gboolean found = FALSE;
272 g_return_val_if_fail (property_name != NULL, FALSE);
274 node = _gtk_style_property_lookup (property_name);
276 if (GTK_IS_CSS_CUSTOM_PROPERTY (node))
278 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (node);
281 *pspec = custom->pspec;
284 *parse_func = custom->property_parse_func;