Pileus Git - ~andy/gtk/blob - gtk/gtkcssstyleproperty.c

   1 /*
   2  * Copyright © 2011 Red Hat Inc.
   3  *
   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.
   8  *
   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.
  13  *
  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/>.
  16  *
  17  * Authors: Benjamin Otte <otte@gnome.org>
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gtkcssstylepropertyprivate.h"
  23
  24 #include "gtkcssstylefuncsprivate.h"
  25 #include "gtkcsstypesprivate.h"
  26 #include "gtkintl.h"
  27 #include "gtkprivatetypebuiltins.h"
  28 #include "gtkstylepropertiesprivate.h"
  29
  30 #include <math.h>
  31 #include <cairo-gobject.h>
  32 #include "gtkcssimagegradientprivate.h"
  33 #include "gtkcssimageprivate.h"
  34
  35 /* this is in case round() is not provided by the compiler,
  36  * such as in the case of C89 compilers, like MSVC
  37  */
  38 #include "fallback-c89.c"
  39
  40 enum {
  41   PROP_0,
  42   PROP_ID,
  43   PROP_SPECIFIED_TYPE,
  44   PROP_COMPUTED_TYPE,
  45   PROP_INHERIT,
  46   PROP_INITIAL
  47 };
  48
  49 G_DEFINE_TYPE (GtkCssStyleProperty, _gtk_css_style_property, GTK_TYPE_STYLE_PROPERTY)
  50
  51 static void
  52 gtk_css_style_property_constructed (GObject *object)
  53 {
  54   GtkCssStyleProperty *property = GTK_CSS_STYLE_PROPERTY (object);
  55   GtkCssStylePropertyClass *klass = GTK_CSS_STYLE_PROPERTY_GET_CLASS (property);
  56
  57   property->id = klass->style_properties->len;
  58   g_ptr_array_add (klass->style_properties, property);
  59
  60   G_OBJECT_CLASS (_gtk_css_style_property_parent_class)->constructed (object);
  61 }
  62
  63 static void
  64 gtk_css_style_property_set_property (GObject      *object,
  65                                      guint         prop_id,
  66                                      const GValue *value,
  67                                      GParamSpec   *pspec)
  68 {
  69   GtkCssStyleProperty *property = GTK_CSS_STYLE_PROPERTY (object);
  70
  71   switch (prop_id)
  72     {
  73     case PROP_INHERIT:
  74       property->inherit = g_value_get_boolean (value);
  75       break;
  76     case PROP_INITIAL:
  77       property->initial_value = g_value_dup_boxed (value);
  78       g_assert (property->initial_value != NULL);
  79       break;
  80     case PROP_COMPUTED_TYPE:
  81       property->computed_type = g_value_get_gtype (value);
  82       g_assert (property->computed_type != G_TYPE_NONE);
  83       break;
  84     default:
  85       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  86       break;
  87     }
  88 }
  89
  90 static void
  91 gtk_css_style_property_get_property (GObject    *object,
  92                                      guint       prop_id,
  93                                      GValue     *value,
  94                                      GParamSpec *pspec)
  95 {
  96   GtkCssStyleProperty *property = GTK_CSS_STYLE_PROPERTY (object);
  97
  98   switch (prop_id)
  99     {
 100     case PROP_SPECIFIED_TYPE:
 101       g_value_set_gtype (value, G_VALUE_TYPE (&property->initial_value));
 102       break;
 103     case PROP_COMPUTED_TYPE:
 104       g_value_set_gtype (value, property->computed_type);
 105       break;
 106     case PROP_ID:
 107       g_value_set_boolean (value, property->id);
 108       break;
 109     case PROP_INHERIT:
 110       g_value_set_boolean (value, property->inherit);
 111       break;
 112     case PROP_INITIAL:
 113       g_value_set_boxed (value, property->initial_value);
 114       break;
 115     default:
 116       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 117       break;
 118     }
 119 }
 120
 121 static void
 122 _gtk_css_style_property_assign (GtkStyleProperty   *property,
 123                                 GtkStyleProperties *props,
 124                                 GtkStateFlags       state,
 125                                 const GValue       *value)
 126 {
 127   GtkCssValue *css_value = _gtk_css_value_new_from_gvalue (value);
 128   _gtk_style_properties_set_property_by_property (props,
 129                                                   GTK_CSS_STYLE_PROPERTY (property),
 130                                                   state,
 131                                                   css_value);
 132   _gtk_css_value_unref (css_value);
 133 }
 134
 135 static GtkCssValue *
 136 _gtk_css_style_property_query (GtkStyleProperty   *property,
 137                                GtkStyleQueryFunc   query_func,
 138                                gpointer            query_data)
 139 {
 140   GtkCssValue *css_value;
 141
 142   css_value = (* query_func) (GTK_CSS_STYLE_PROPERTY (property)->id, query_data);
 143   if (css_value)
 144     {
 145       /* Somebody make this a vfunc */
 146       if (_gtk_css_value_holds (css_value, GTK_TYPE_CSS_IMAGE))
 147         {
 148           GtkCssImage *image = _gtk_css_value_get_image (css_value);
 149           cairo_pattern_t *pattern;
 150           cairo_surface_t *surface;
 151           cairo_matrix_t matrix;
 152
 153           if (image == NULL)
 154             return _gtk_css_value_new_from_pattern (NULL);
 155           else if (GTK_IS_CSS_IMAGE_GRADIENT (image))
 156             return _gtk_css_value_new_from_pattern (GTK_CSS_IMAGE_GRADIENT (image)->pattern);
 157           else
 158             {
 159               double width, height;
 160
 161               /* the 100, 100 is rather random */
 162               _gtk_css_image_get_concrete_size (image, 0, 0, 100, 100, &width, &height);
 163               surface = _gtk_css_image_get_surface (image, NULL, width, height);
 164               pattern = cairo_pattern_create_for_surface (surface);
 165               cairo_matrix_init_scale (&matrix, width, height);
 166               cairo_pattern_set_matrix (pattern, &matrix);
 167               cairo_surface_destroy (surface);
 168               return _gtk_css_value_new_take_pattern (pattern);
 169             }
 170         }
 171       else if (_gtk_css_value_holds (css_value, GTK_TYPE_CSS_NUMBER))
 172         {
 173           int v = round (_gtk_css_number_get (_gtk_css_value_get_number (css_value), 100));
 174           return _gtk_css_value_new_from_int (v);
 175         }
 176       else
 177         return _gtk_css_value_ref (css_value);
 178     }
 179   else
 180     return _gtk_css_value_ref (_gtk_css_style_property_get_initial_value (GTK_CSS_STYLE_PROPERTY (property)));
 181 }
 182
 183 static gboolean
 184 gtk_css_style_property_parse_value (GtkStyleProperty *property,
 185                                     GValue           *value,
 186                                     GtkCssParser     *parser,
 187                                     GFile            *base)
 188 {
 189   GtkCssStyleProperty *style_property = GTK_CSS_STYLE_PROPERTY (property);
 190
 191   if (_gtk_css_parser_try (parser, "initial", TRUE))
 192     {
 193       /* the initial value can be explicitly specified with the
 194        * ‘initial’ keyword which all properties accept.
 195        */
 196       g_value_init (value, GTK_TYPE_CSS_SPECIAL_VALUE);
 197       g_value_set_enum (value, GTK_CSS_INITIAL);
 198       return TRUE;
 199     }
 200   else if (_gtk_css_parser_try (parser, "inherit", TRUE))
 201     {
 202       /* All properties accept the ‘inherit’ value which
 203        * explicitly specifies that the value will be determined
 204        * by inheritance. The ‘inherit’ value can be used to
 205        * strengthen inherited values in the cascade, and it can
 206        * also be used on properties that are not normally inherited.
 207        */
 208       g_value_init (value, GTK_TYPE_CSS_SPECIAL_VALUE);
 209       g_value_set_enum (value, GTK_CSS_INHERIT);
 210       return TRUE;
 211     }
 212
 213   g_value_init (value, _gtk_css_style_property_get_specified_type (style_property));
 214   if (!(* style_property->parse_value) (style_property, value, parser, base))
 215     {
 216       g_value_unset (value);
 217       return FALSE;
 218     }
 219
 220   return TRUE;
 221 }
 222
 223 static void
 224 _gtk_css_style_property_class_init (GtkCssStylePropertyClass *klass)
 225 {
 226   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 227   GtkStylePropertyClass *property_class = GTK_STYLE_PROPERTY_CLASS (klass);
 228
 229   object_class->constructed = gtk_css_style_property_constructed;
 230   object_class->set_property = gtk_css_style_property_set_property;
 231   object_class->get_property = gtk_css_style_property_get_property;
 232
 233   g_object_class_install_property (object_class,
 234                                    PROP_ID,
 235                                    g_param_spec_uint ("id",
 236                                                       P_("ID"),
 237                                                       P_("The numeric id for quick access"),
 238                                                       0, G_MAXUINT, 0,
 239                                                       G_PARAM_READABLE));
 240   g_object_class_install_property (object_class,
 241                                    PROP_SPECIFIED_TYPE,
 242                                    g_param_spec_gtype ("specified-type",
 243                                                        P_("Specified type"),
 244                                                        P_("The type of values after parsing"),
 245                                                        G_TYPE_NONE,
 246                                                        G_PARAM_READABLE));
 247   g_object_class_install_property (object_class,
 248                                    PROP_COMPUTED_TYPE,
 249                                    g_param_spec_gtype ("computed-type",
 250                                                        P_("Computed type"),
 251                                                        P_("The type of values after style lookup"),
 252                                                        G_TYPE_NONE,
 253                                                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 254   g_object_class_install_property (object_class,
 255                                    PROP_INHERIT,
 256                                    g_param_spec_boolean ("inherit",
 257                                                          P_("Inherit"),
 258                                                          P_("Set if the value is inherited by default"),
 259                                                          FALSE,
 260                                                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 261   g_object_class_install_property (object_class,
 262                                    PROP_INITIAL,
 263                                    g_param_spec_boxed ("initial-value",
 264                                                        P_("Initial value"),
 265                                                        P_("The initial specified value used for this property"),
 266                                                        GTK_TYPE_CSS_VALUE,
 267                                                        G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 268
 269   property_class->assign = _gtk_css_style_property_assign;
 270   property_class->query = _gtk_css_style_property_query;
 271   property_class->parse_value = gtk_css_style_property_parse_value;
 272
 273   klass->style_properties = g_ptr_array_new ();
 274 }
 275
 276 static gboolean
 277 gtk_css_style_property_real_parse_value (GtkCssStyleProperty *property,
 278                                          GValue              *value,
 279                                          GtkCssParser        *parser,
 280                                          GFile               *base)
 281 {
 282   return _gtk_css_style_parse_value (value, parser, base);
 283 }
 284
 285 static void
 286 gtk_css_style_property_real_print_value (GtkCssStyleProperty *property,
 287                                          const GValue        *value,
 288                                          GString             *string)
 289 {
 290   _gtk_css_style_print_value (value, string);
 291 }
 292
 293 static GtkCssValue *
 294 gtk_css_style_property_real_compute_value (GtkCssStyleProperty *property,
 295                                            GtkStyleContext     *context,
 296                                            GtkCssValue         *specified)
 297 {
 298   return _gtk_css_style_compute_value (context, _gtk_css_style_property_get_computed_type (property), specified);
 299 }
 300
 301 static void
 302 _gtk_css_style_property_init (GtkCssStyleProperty *property)
 303 {
 304   property->parse_value = gtk_css_style_property_real_parse_value;
 305   property->print_value = gtk_css_style_property_real_print_value;
 306   property->compute_value = gtk_css_style_property_real_compute_value;
 307 }
 308
 309 /**
 310  * _gtk_css_style_property_get_n_properties:
 311  *
 312  * Gets the number of style properties. This number can increase when new
 313  * theme engines are loaded. Shorthand properties are not included here.
 314  *
 315  * Returns: The number of style properties.
 316  **/
 317 guint
 318 _gtk_css_style_property_get_n_properties (void)
 319 {
 320   GtkCssStylePropertyClass *klass;
 321
 322   klass = g_type_class_peek (GTK_TYPE_CSS_STYLE_PROPERTY);
 323   if (G_UNLIKELY (klass == NULL))
 324     {
 325       _gtk_style_property_init_properties ();
 326       klass = g_type_class_peek (GTK_TYPE_CSS_STYLE_PROPERTY);
 327       g_assert (klass);
 328     }
 329
 330   return klass->style_properties->len;
 331 }
 332
 333 /**
 334  * _gtk_css_style_property_lookup_by_id:
 335  * @id: the id of the property
 336  *
 337  * Gets the style property with the given id. All style properties (but not
 338  * shorthand properties) are indexable by id so that it's easy to use arrays
 339  * when doing style lookups.
 340  *
 341  * Returns: (transfer none): The style property with the given id
 342  **/
 343 GtkCssStyleProperty *
 344 _gtk_css_style_property_lookup_by_id (guint id)
 345 {
 346   GtkCssStylePropertyClass *klass;
 347
 348   klass = g_type_class_peek (GTK_TYPE_CSS_STYLE_PROPERTY);
 349   if (G_UNLIKELY (klass == NULL))
 350     {
 351       _gtk_style_property_init_properties ();
 352       klass = g_type_class_peek (GTK_TYPE_CSS_STYLE_PROPERTY);
 353       g_assert (klass);
 354     }
 355   g_return_val_if_fail (id < klass->style_properties->len, NULL);
 356
 357   return g_ptr_array_index (klass->style_properties, id);
 358 }
 359
 360 /**
 361  * _gtk_css_style_property_is_inherit:
 362  * @property: the property
 363  *
 364  * Queries if the given @property is inherited. See
 365  * <ulink url="http://www.w3.org/TR/css3-cascade/#inheritance>
 366  * the CSS documentation</ulink> for an explanation of this concept.
 367  *
 368  * Returns: %TRUE if the property is inherited by default.
 369  **/
 370 gboolean
 371 _gtk_css_style_property_is_inherit (GtkCssStyleProperty *property)
 372 {
 373   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), 0);
 374
 375   return property->inherit;
 376 }
 377
 378 /**
 379  * _gtk_css_style_property_get_id:
 380  * @property: the property
 381  *
 382  * Gets the id for the given property. IDs are used to allow using arrays
 383  * for style lookups.
 384  *
 385  * Returns: The id of the property
 386  **/
 387 guint
 388 _gtk_css_style_property_get_id (GtkCssStyleProperty *property)
 389 {
 390   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), 0);
 391
 392   return property->id;
 393 }
 394
 395 /**
 396  * _gtk_css_style_property_get_initial_value:
 397  * @property: the property
 398  *
 399  * Queries the initial value of the given @property. See
 400  * <ulink url="http://www.w3.org/TR/css3-cascade/#intial>
 401  * the CSS documentation</ulink> for an explanation of this concept.
 402  *
 403  * Returns: a reference to the initial value. The value will never change.
 404  **/
 405 GtkCssValue *
 406 _gtk_css_style_property_get_initial_value (GtkCssStyleProperty *property)
 407 {
 408   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), NULL);
 409
 410   return property->initial_value;
 411 }
 412
 413 /**
 414  * _gtk_css_style_property_get_computed_type:
 415  * @property: the property to query
 416  *
 417  * Gets the #GType used for values for this property after a CSS lookup has
 418  * happened. _gtk_css_style_property_compute_value() will convert values to
 419  * this type.
 420  *
 421  * Returns: the #GType used for computed values.
 422  **/
 423 GType
 424 _gtk_css_style_property_get_computed_type (GtkCssStyleProperty *property)
 425 {
 426   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), G_TYPE_NONE);
 427
 428   return property->computed_type;
 429 }
 430
 431 /**
 432  * _gtk_css_style_property_get_specified_type:
 433  * @property: the property to query
 434  *
 435  * Gets the #GType used for values for this property after CSS parsing if
 436  * the value is not a special keyword. _gtk_css_style_property_compute_value()
 437  * will convert values of this type to the computed type.
 438  *
 439  * The initial value returned by _gtk_css_style_property_get_initial_value()
 440  * will be of this type.
 441  *
 442  * Returns: the #GType used for specified values.
 443  **/
 444 GType
 445 _gtk_css_style_property_get_specified_type (GtkCssStyleProperty *property)
 446 {
 447   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), G_TYPE_NONE);
 448
 449   return _gtk_css_value_get_content_type (property->initial_value);
 450 }
 451
 452 gboolean
 453 _gtk_css_style_property_is_specified_type (GtkCssStyleProperty *property,
 454                                            GType                type)
 455 {
 456   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), FALSE);
 457
 458   /* If it's our specified type, of course it's valid */
 459   if (type == _gtk_css_value_get_content_type (property->initial_value))
 460     return TRUE;
 461
 462   /* The special values 'inherit' and 'initial' are always valid */
 463   if (type == GTK_TYPE_CSS_SPECIAL_VALUE)
 464     return TRUE;
 465
 466   /* XXX: Someone needs to fix that legacy */
 467   if ((_gtk_css_value_holds (property->initial_value, GDK_TYPE_RGBA) ||
 468        _gtk_css_value_holds (property->initial_value, GDK_TYPE_COLOR)) &&
 469       type == GTK_TYPE_SYMBOLIC_COLOR)
 470     return TRUE;
 471   if (_gtk_css_value_holds (property->initial_value, CAIRO_GOBJECT_TYPE_PATTERN) &&
 472       type == GTK_TYPE_GRADIENT)
 473     return TRUE;
 474
 475   return FALSE;
 476 }
 477
 478 /**
 479  * _gtk_css_style_property_compute_value:
 480  * @property: the property
 481  * @computed: (out): an uninitialized value to be filled with the result
 482  * @context: the context to use for resolving
 483  * @specified: the value to compute from
 484  *
 485  * Converts the @specified value into the @computed value using the
 486  * information in @context. This step is explained in detail in
 487  * <ulink url="http://www.w3.org/TR/css3-cascade/#computed>
 488  * the CSS documentation</ulink>.
 489  **/
 490 GtkCssValue *
 491 _gtk_css_style_property_compute_value (GtkCssStyleProperty *property,
 492                                        GtkStyleContext     *context,
 493                                        GtkCssValue         *specified)
 494 {
 495   g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), NULL);
 496   g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
 497
 498   return property->compute_value (property, context, specified);
 499 }
 500
 501 /**
 502  * _gtk_css_style_property_print_value:
 503  * @property: the property
 504  * @value: the value to print
 505  * @string: the string to print to
 506  *
 507  * Prints @value to the given @string in CSS format. The @value must be a
 508  * valid specified value as parsed using the parse functions or as assigned
 509  * via _gtk_style_property_assign().
 510  **/
 511 void
 512 _gtk_css_style_property_print_value (GtkCssStyleProperty    *property,
 513                                      GtkCssValue            *css_value,
 514                                      GString                *string)
 515 {
 516   g_return_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property));
 517   g_return_if_fail (css_value != NULL);
 518   g_return_if_fail (string != NULL);
 519
 520   if (_gtk_css_value_is_special (css_value))
 521     {
 522       GEnumClass *enum_class;
 523       GEnumValue *enum_value;
 524
 525       enum_class = g_type_class_ref (GTK_TYPE_CSS_SPECIAL_VALUE);
 526       enum_value = g_enum_get_value (enum_class, _gtk_css_value_get_special_kind (css_value));
 527
 528       g_string_append (string, enum_value->value_nick);
 529
 530       g_type_class_unref (enum_class);
 531     }
 532   else
 533     {
 534       GValue value = G_VALUE_INIT;
 535       _gtk_css_value_init_gvalue (css_value, &value);
 536       property->print_value (property, &value, string);
 537       g_value_unset (&value);
 538     }
 539 }
 540