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,
37 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (property);
40 if (custom->property_parse_func)
45 g_value_init (value, _gtk_style_property_get_value_type (property));
47 value_str = _gtk_css_parser_read_value (parser);
48 if (value_str != NULL)
50 success = (* custom->property_parse_func) (value_str, value, &error);
58 GtkCssStyleProperty *style = GTK_CSS_STYLE_PROPERTY (property);
59 g_value_init (value, _gtk_css_style_property_get_specified_type (style));
61 success = _gtk_css_style_parse_value (value, parser, base);
65 g_value_unset (value);
71 _gtk_css_custom_property_class_init (GtkCssCustomPropertyClass *klass)
73 GtkStylePropertyClass *property_class = GTK_STYLE_PROPERTY_CLASS (klass);
75 property_class->parse_value = gtk_css_custom_property_parse_value;
80 _gtk_css_custom_property_init (GtkCssCustomProperty *custom_property)
85 gtk_css_custom_property_create_initial_value (GParamSpec *pspec)
87 GValue value = G_VALUE_INIT;
90 g_value_init (&value, pspec->value_type);
92 if (pspec->value_type == GTK_TYPE_THEMING_ENGINE)
93 g_value_set_object (&value, gtk_theming_engine_load (NULL));
94 else if (pspec->value_type == PANGO_TYPE_FONT_DESCRIPTION)
95 g_value_take_boxed (&value, pango_font_description_from_string ("Sans 10"));
96 else if (pspec->value_type == GDK_TYPE_RGBA)
99 gdk_rgba_parse (&color, "pink");
100 g_value_set_boxed (&value, &color);
102 else if (pspec->value_type == GDK_TYPE_COLOR)
105 gdk_color_parse ("pink", &color);
106 g_value_set_boxed (&value, &color);
108 else if (pspec->value_type == GTK_TYPE_BORDER)
110 g_value_take_boxed (&value, gtk_border_new ());
113 g_param_value_set_default (pspec, &value);
115 result = _gtk_css_value_new_from_gvalue (&value);
116 g_value_unset (&value);
121 /* Property registration functions */
124 * gtk_theming_engine_register_property: (skip)
125 * @name_space: namespace for the property name
126 * @parse_func: parsing function to use, or %NULL
127 * @pspec: the #GParamSpec for the new property
129 * Registers a property so it can be used in the CSS file format,
130 * on the CSS file the property will look like
131 * "-${@name_space}-${property_name}". being
132 * ${property_name} the given to @pspec. @name_space will usually
133 * be the theme engine name.
135 * For any type a @parse_func may be provided, being this function
136 * used for turning any property value (between ':' and ';') in
137 * CSS to the #GValue needed. For basic types there is already
138 * builtin parsing support, so %NULL may be provided for these
142 * Engines must ensure property registration happens exactly once,
143 * usually GTK+ deals with theming engines as singletons, so this
144 * should be guaranteed to happen once, but bear this in mind
145 * when creating #GtkThemeEngine<!-- -->s yourself.
149 * In order to make use of the custom registered properties in
150 * the CSS file, make sure the engine is loaded first by specifying
151 * the engine property, either in a previous rule or within the same
155 * engine: someengine;
156 * -SomeEngine-custom-property: 2;
164 gtk_theming_engine_register_property (const gchar *name_space,
165 GtkStylePropertyParser parse_func,
168 GtkCssCustomProperty *node;
169 GtkCssValue *initial;
172 g_return_if_fail (name_space != NULL);
173 g_return_if_fail (strchr (name_space, ' ') == NULL);
174 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
176 name = g_strdup_printf ("-%s-%s", name_space, pspec->name);
178 /* This also initializes the default properties */
179 if (_gtk_style_property_lookup (pspec->name))
181 g_warning ("a property with name '%s' already exists", name);
186 initial = gtk_css_custom_property_create_initial_value (pspec);
188 node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
189 "initial-value", initial,
191 "computed-type", pspec->value_type,
192 "value-type", pspec->value_type,
195 node->property_parse_func = parse_func;
197 _gtk_css_value_unref (initial);
202 * gtk_style_properties_register_property: (skip)
203 * @parse_func: parsing function to use, or %NULL
204 * @pspec: the #GParamSpec for the new property
206 * Registers a property so it can be used in the CSS file format.
207 * This function is the low-level equivalent of
208 * gtk_theming_engine_register_property(), if you are implementing
209 * a theming engine, you want to use that function instead.
214 gtk_style_properties_register_property (GtkStylePropertyParser parse_func,
217 GtkCssCustomProperty *node;
218 GtkCssValue *initial;
220 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
222 /* This also initializes the default properties */
223 if (_gtk_style_property_lookup (pspec->name))
225 g_warning ("a property with name '%s' already exists", pspec->name);
229 initial = gtk_css_custom_property_create_initial_value (pspec);
231 node = g_object_new (GTK_TYPE_CSS_CUSTOM_PROPERTY,
232 "initial-value", initial,
234 "computed-type", pspec->value_type,
235 "value-type", pspec->value_type,
238 node->property_parse_func = parse_func;
240 _gtk_css_value_unref (initial);
244 * gtk_style_properties_lookup_property: (skip)
245 * @property_name: property name to look up
246 * @parse_func: (out): return location for the parse function
247 * @pspec: (out) (transfer none): return location for the #GParamSpec
249 * Returns %TRUE if a property has been registered, if @pspec or
250 * @parse_func are not %NULL, the #GParamSpec and parsing function
251 * will be respectively returned.
253 * Returns: %TRUE if the property is registered, %FALSE otherwise
258 gtk_style_properties_lookup_property (const gchar *property_name,
259 GtkStylePropertyParser *parse_func,
262 GtkStyleProperty *node;
263 gboolean found = FALSE;
265 g_return_val_if_fail (property_name != NULL, FALSE);
267 node = _gtk_style_property_lookup (property_name);
269 if (GTK_IS_CSS_CUSTOM_PROPERTY (node))
271 GtkCssCustomProperty *custom = GTK_CSS_CUSTOM_PROPERTY (node);
274 *pspec = custom->pspec;
277 *parse_func = custom->property_parse_func;