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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Red Hat, Inc.
   3  *
   4  * Author: Cosimo Cecchi <cosimoc@gnome.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gtkcssshadowvalueprivate.h"
  23
  24 #include "gtkcssnumbervalueprivate.h"
  25 #include "gtkcssrgbavalueprivate.h"
  26 #include "gtkstylecontextprivate.h"
  27 #include "gtksymboliccolorprivate.h"
  28 #include "gtkthemingengineprivate.h"
  29 #include "gtkpango.h"
  30
  31 struct _GtkCssValue {
  32   GTK_CSS_VALUE_BASE
  33   guint inset :1;
  34
  35   GtkCssValue *hoffset;
  36   GtkCssValue *voffset;
  37   GtkCssValue *radius;
  38   GtkCssValue *spread;
  39
  40   GtkCssValue *color;
  41 };
  42
  43 static GtkCssValue *    gtk_css_shadow_value_new (GtkCssValue *hoffset,
  44                                                   GtkCssValue *voffset,
  45                                                   GtkCssValue *radius,
  46                                                   GtkCssValue *spread,
  47                                                   gboolean     inset,
  48                                                   GtkCssValue *color);
  49
  50 static void
  51 gtk_css_value_shadow_free (GtkCssValue *shadow)
  52 {
  53   _gtk_css_value_unref (shadow->hoffset);
  54   _gtk_css_value_unref (shadow->voffset);
  55   _gtk_css_value_unref (shadow->radius);
  56   _gtk_css_value_unref (shadow->spread);
  57   _gtk_css_value_unref (shadow->color);
  58
  59   g_slice_free (GtkCssValue, shadow);
  60 }
  61
  62 static GtkCssValue *
  63 gtk_css_value_shadow_compute (GtkCssValue     *shadow,
  64                               guint            property_id,
  65                               GtkStyleContext *context)
  66 {
  67   GdkRGBA transparent = { 0, 0, 0, 0 };
  68   GtkCssValue *color, *fallback;
  69
  70   fallback = _gtk_css_symbolic_value_new_take_symbolic_color (gtk_symbolic_color_new_literal (&transparent));
  71   color = _gtk_css_rgba_value_compute_from_symbolic (shadow->color,
  72                                                      fallback,
  73                                                      context,
  74                                                      FALSE);
  75   _gtk_css_value_unref (fallback);
  76
  77   return gtk_css_shadow_value_new (_gtk_css_value_compute (shadow->hoffset, property_id, context),
  78                                    _gtk_css_value_compute (shadow->voffset, property_id, context),
  79                                    _gtk_css_value_compute (shadow->radius, property_id, context),
  80                                    _gtk_css_value_compute (shadow->spread, property_id, context),
  81                                    shadow->inset,
  82                                    color);
  83 }
  84
  85 static gboolean
  86 gtk_css_value_shadow_equal (const GtkCssValue *shadow1,
  87                             const GtkCssValue *shadow2)
  88 {
  89   return shadow1->inset == shadow2->inset
  90       && _gtk_css_value_equal (shadow1->hoffset, shadow2->hoffset)
  91       && _gtk_css_value_equal (shadow1->voffset, shadow2->voffset)
  92       && _gtk_css_value_equal (shadow1->radius, shadow2->radius)
  93       && _gtk_css_value_equal (shadow1->spread, shadow2->spread)
  94       && _gtk_css_value_equal (shadow1->color, shadow2->color);
  95 }
  96
  97 static GtkCssValue *
  98 gtk_css_value_shadow_transition (GtkCssValue *start,
  99                                  GtkCssValue *end,
 100                                  double       progress)
 101 {
 102   if (start->inset != end->inset)
 103     return NULL;
 104
 105   return gtk_css_shadow_value_new (_gtk_css_value_transition (start->hoffset, end->hoffset, progress),
 106                                    _gtk_css_value_transition (start->voffset, end->voffset, progress),
 107                                    _gtk_css_value_transition (start->radius, end->radius, progress),
 108                                    _gtk_css_value_transition (start->spread, end->spread, progress),
 109                                    start->inset,
 110                                    _gtk_css_value_transition (start->color, end->color, progress));
 111 }
 112
 113 static void
 114 gtk_css_value_shadow_print (const GtkCssValue *shadow,
 115                             GString           *string)
 116 {
 117   _gtk_css_value_print (shadow->hoffset, string);
 118   g_string_append_c (string, ' ');
 119   _gtk_css_value_print (shadow->voffset, string);
 120   g_string_append_c (string, ' ');
 121   if (_gtk_css_number_value_get (shadow->radius, 100) != 0 ||
 122       _gtk_css_number_value_get (shadow->spread, 100) != 0)
 123     {
 124       _gtk_css_value_print (shadow->radius, string);
 125       g_string_append_c (string, ' ');
 126     }
 127
 128   if (_gtk_css_number_value_get (shadow->spread, 100) != 0)
 129     {
 130       _gtk_css_value_print (shadow->spread, string);
 131       g_string_append_c (string, ' ');
 132     }
 133
 134   _gtk_css_value_print (shadow->color, string);
 135
 136   if (shadow->inset)
 137     g_string_append (string, " inset");
 138
 139 }
 140
 141 static const GtkCssValueClass GTK_CSS_VALUE_SHADOW = {
 142   gtk_css_value_shadow_free,
 143   gtk_css_value_shadow_compute,
 144   gtk_css_value_shadow_equal,
 145   gtk_css_value_shadow_transition,
 146   gtk_css_value_shadow_print
 147 };
 148
 149 static GtkCssValue *
 150 gtk_css_shadow_value_new (GtkCssValue *hoffset,
 151                           GtkCssValue *voffset,
 152                           GtkCssValue *radius,
 153                           GtkCssValue *spread,
 154                           gboolean     inset,
 155                           GtkCssValue *color)
 156 {
 157   GtkCssValue *retval;
 158
 159   retval = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_SHADOW);
 160
 161   retval->hoffset = hoffset;
 162   retval->voffset = voffset;
 163   retval->radius = radius;
 164   retval->spread = spread;
 165   retval->inset = inset;
 166   retval->color = color;
 167
 168   return retval;
 169 }
 170
 171 GtkCssValue *
 172 _gtk_css_shadow_value_new_for_transition (GtkCssValue *target)
 173 {
 174   GdkRGBA transparent = { 0, 0, 0, 0 };
 175
 176   g_return_val_if_fail (target->class == &GTK_CSS_VALUE_SHADOW, NULL);
 177
 178   return gtk_css_shadow_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
 179                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 180                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 181                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 182                                    target->inset,
 183                                    _gtk_css_rgba_value_new_from_rgba (&transparent));
 184 }
 185
 186 static gboolean
 187 value_is_done_parsing (GtkCssParser *parser)
 188 {
 189   return _gtk_css_parser_is_eof (parser) ||
 190          _gtk_css_parser_begins_with (parser, ',') ||
 191          _gtk_css_parser_begins_with (parser, ';') ||
 192          _gtk_css_parser_begins_with (parser, '}');
 193 }
 194
 195 GtkCssValue *
 196 _gtk_css_shadow_value_parse (GtkCssParser *parser)
 197 {
 198   enum {
 199     HOFFSET,
 200     VOFFSET,
 201     RADIUS,
 202     SPREAD,
 203     COLOR,
 204     N_VALUES
 205   };
 206   GtkCssValue *values[N_VALUES] = { NULL, };
 207   gboolean inset;
 208   guint i;
 209
 210   inset = _gtk_css_parser_try (parser, "inset", TRUE);
 211
 212   do
 213   {
 214     if (values[HOFFSET] == NULL &&
 215          _gtk_css_parser_has_number (parser))
 216       {
 217         values[HOFFSET] = _gtk_css_number_value_parse (parser,
 218                                                        GTK_CSS_PARSE_LENGTH
 219                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 220         if (values[HOFFSET] == NULL)
 221           goto fail;
 222
 223         values[VOFFSET] = _gtk_css_number_value_parse (parser,
 224                                                        GTK_CSS_PARSE_LENGTH
 225                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 226         if (values[VOFFSET] == NULL)
 227           goto fail;
 228
 229         if (_gtk_css_parser_has_number (parser))
 230           {
 231             values[RADIUS] = _gtk_css_number_value_parse (parser,
 232                                                           GTK_CSS_PARSE_LENGTH
 233                                                           | GTK_CSS_POSITIVE_ONLY
 234                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 235             if (values[RADIUS] == NULL)
 236               goto fail;
 237           }
 238         else
 239           values[RADIUS] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 240
 241         if (_gtk_css_parser_has_number (parser))
 242           {
 243             values[SPREAD] = _gtk_css_number_value_parse (parser,
 244                                                           GTK_CSS_PARSE_LENGTH
 245                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 246             if (values[SPREAD] == NULL)
 247               goto fail;
 248           }
 249         else
 250           values[SPREAD] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 251       }
 252     else if (!inset && _gtk_css_parser_try (parser, "inset", TRUE))
 253       {
 254         if (values[HOFFSET] == NULL)
 255           goto fail;
 256         inset = TRUE;
 257         break;
 258       }
 259     else if (values[COLOR] == NULL)
 260       {
 261         values[COLOR] = _gtk_css_symbolic_value_new (parser);
 262
 263         if (values[COLOR] == NULL)
 264           goto fail;
 265       }
 266     else
 267       {
 268         /* We parsed everything and there's still stuff left?
 269          * Pretend we didn't notice and let the normal code produce
 270          * a 'junk at end of value' error */
 271         goto fail;
 272       }
 273   }
 274   while (values[HOFFSET] == NULL || !value_is_done_parsing (parser));
 275
 276   if (values[COLOR] == NULL)
 277     values[COLOR] = _gtk_css_symbolic_value_new_take_symbolic_color (
 278                       gtk_symbolic_color_ref (
 279                         _gtk_symbolic_color_get_current_color ()));
 280
 281   return gtk_css_shadow_value_new (values[HOFFSET], values[VOFFSET],
 282                                    values[RADIUS], values[SPREAD],
 283                                    inset, values[COLOR]);
 284
 285 fail:
 286   for (i = 0; i < N_VALUES; i++)
 287     {
 288       if (values[i])
 289         _gtk_css_value_unref (values[i]);
 290     }
 291
 292   return NULL;
 293 }
 294
 295 void
 296 _gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
 297                                     cairo_t           *cr,
 298                                     PangoLayout       *layout)
 299 {
 300   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 301
 302   if (!cairo_has_current_point (cr))
 303     cairo_move_to (cr, 0, 0);
 304
 305   cairo_save (cr);
 306
 307   cairo_rel_move_to (cr,
 308                      _gtk_css_number_value_get (shadow->hoffset, 0),
 309                      _gtk_css_number_value_get (shadow->voffset, 0));
 310   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 311   _gtk_pango_fill_layout (cr, layout);
 312
 313   cairo_rel_move_to (cr,
 314                      - _gtk_css_number_value_get (shadow->hoffset, 0),
 315                      - _gtk_css_number_value_get (shadow->voffset, 0));
 316   cairo_restore (cr);
 317 }
 318
 319 void
 320 _gtk_css_shadow_value_paint_icon (const GtkCssValue *shadow,
 321                                   cairo_t           *cr)
 322 {
 323   cairo_pattern_t *pattern;
 324
 325   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 326
 327   cairo_save (cr);
 328   pattern = cairo_pattern_reference (cairo_get_source (cr));
 329   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 330
 331   cairo_translate (cr,
 332                    _gtk_css_number_value_get (shadow->hoffset, 0),
 333                    _gtk_css_number_value_get (shadow->voffset, 0));
 334   cairo_mask (cr, pattern);
 335
 336   cairo_restore (cr);
 337   cairo_pattern_destroy (pattern);
 338 }
 339
 340 void
 341 _gtk_css_shadow_value_paint_spinner (const GtkCssValue *shadow,
 342                                      cairo_t           *cr,
 343                                      gdouble            radius,
 344                                      gdouble            progress)
 345 {
 346   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 347
 348   cairo_save (cr);
 349
 350   cairo_translate (cr,
 351                    _gtk_css_number_value_get (shadow->hoffset, 0),
 352                    _gtk_css_number_value_get (shadow->voffset, 0));
 353   _gtk_theming_engine_paint_spinner (cr,
 354                                      radius, progress,
 355                                      _gtk_css_rgba_value_get_rgba (shadow->color));
 356
 357   cairo_restore (cr);
 358 }
 359
 360 void
 361 _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
 362                                  cairo_t             *cr,
 363                                  const GtkRoundedBox *padding_box)
 364 {
 365   GtkRoundedBox box;
 366   double spread;
 367
 368   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 369
 370   cairo_save (cr);
 371   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
 372
 373   _gtk_rounded_box_path (padding_box, cr);
 374   cairo_clip (cr);
 375
 376   box = *padding_box;
 377   _gtk_rounded_box_move (&box,
 378                          _gtk_css_number_value_get (shadow->hoffset, 0),
 379                          _gtk_css_number_value_get (shadow->voffset, 0));
 380   spread = _gtk_css_number_value_get (shadow->spread, 0);
 381   _gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
 382
 383   _gtk_rounded_box_path (&box, cr);
 384   _gtk_rounded_box_clip_path (padding_box, cr);
 385
 386   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 387   cairo_fill (cr);
 388
 389   cairo_restore (cr);
 390 }