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                               GtkCssDependencies *dependencies)
  67 {
  68   GtkCssValue *hoffset, *voffset, *radius, *spread, *color;
  69   GtkCssDependencies child_deps;
  70
  71   child_deps = 0;
  72   hoffset = _gtk_css_value_compute (shadow->hoffset, property_id, context, &child_deps);
  73   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  74
  75   child_deps = 0;
  76   voffset = _gtk_css_value_compute (shadow->voffset, property_id, context, &child_deps);
  77   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  78
  79   child_deps = 0;
  80   radius = _gtk_css_value_compute (shadow->radius, property_id, context, &child_deps);
  81   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  82
  83   child_deps = 0;
  84   spread = _gtk_css_value_compute (shadow->spread, property_id, context, &child_deps),
  85   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  86
  87   child_deps = 0;
  88   color = _gtk_css_value_compute (shadow->color, property_id, context, &child_deps);
  89   *dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
  90
  91   return gtk_css_shadow_value_new (hoffset, voffset, radius, spread, shadow->inset, color);
  92 }
  93
  94 static gboolean
  95 gtk_css_value_shadow_equal (const GtkCssValue *shadow1,
  96                             const GtkCssValue *shadow2)
  97 {
  98   return shadow1->inset == shadow2->inset
  99       && _gtk_css_value_equal (shadow1->hoffset, shadow2->hoffset)
 100       && _gtk_css_value_equal (shadow1->voffset, shadow2->voffset)
 101       && _gtk_css_value_equal (shadow1->radius, shadow2->radius)
 102       && _gtk_css_value_equal (shadow1->spread, shadow2->spread)
 103       && _gtk_css_value_equal (shadow1->color, shadow2->color);
 104 }
 105
 106 static GtkCssValue *
 107 gtk_css_value_shadow_transition (GtkCssValue *start,
 108                                  GtkCssValue *end,
 109                                  double       progress)
 110 {
 111   if (start->inset != end->inset)
 112     return NULL;
 113
 114   return gtk_css_shadow_value_new (_gtk_css_value_transition (start->hoffset, end->hoffset, progress),
 115                                    _gtk_css_value_transition (start->voffset, end->voffset, progress),
 116                                    _gtk_css_value_transition (start->radius, end->radius, progress),
 117                                    _gtk_css_value_transition (start->spread, end->spread, progress),
 118                                    start->inset,
 119                                    _gtk_css_value_transition (start->color, end->color, progress));
 120 }
 121
 122 static void
 123 gtk_css_value_shadow_print (const GtkCssValue *shadow,
 124                             GString           *string)
 125 {
 126   _gtk_css_value_print (shadow->hoffset, string);
 127   g_string_append_c (string, ' ');
 128   _gtk_css_value_print (shadow->voffset, string);
 129   g_string_append_c (string, ' ');
 130   if (_gtk_css_number_value_get (shadow->radius, 100) != 0 ||
 131       _gtk_css_number_value_get (shadow->spread, 100) != 0)
 132     {
 133       _gtk_css_value_print (shadow->radius, string);
 134       g_string_append_c (string, ' ');
 135     }
 136
 137   if (_gtk_css_number_value_get (shadow->spread, 100) != 0)
 138     {
 139       _gtk_css_value_print (shadow->spread, string);
 140       g_string_append_c (string, ' ');
 141     }
 142
 143   _gtk_css_value_print (shadow->color, string);
 144
 145   if (shadow->inset)
 146     g_string_append (string, " inset");
 147
 148 }
 149
 150 static const GtkCssValueClass GTK_CSS_VALUE_SHADOW = {
 151   gtk_css_value_shadow_free,
 152   gtk_css_value_shadow_compute,
 153   gtk_css_value_shadow_equal,
 154   gtk_css_value_shadow_transition,
 155   gtk_css_value_shadow_print
 156 };
 157
 158 static GtkCssValue *
 159 gtk_css_shadow_value_new (GtkCssValue *hoffset,
 160                           GtkCssValue *voffset,
 161                           GtkCssValue *radius,
 162                           GtkCssValue *spread,
 163                           gboolean     inset,
 164                           GtkCssValue *color)
 165 {
 166   GtkCssValue *retval;
 167
 168   retval = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_SHADOW);
 169
 170   retval->hoffset = hoffset;
 171   retval->voffset = voffset;
 172   retval->radius = radius;
 173   retval->spread = spread;
 174   retval->inset = inset;
 175   retval->color = color;
 176
 177   return retval;
 178 }
 179
 180 GtkCssValue *
 181 _gtk_css_shadow_value_new_for_transition (GtkCssValue *target)
 182 {
 183   GdkRGBA transparent = { 0, 0, 0, 0 };
 184
 185   g_return_val_if_fail (target->class == &GTK_CSS_VALUE_SHADOW, NULL);
 186
 187   return gtk_css_shadow_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
 188                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 189                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 190                                    _gtk_css_number_value_new (0, GTK_CSS_PX),
 191                                    target->inset,
 192                                    _gtk_css_rgba_value_new_from_rgba (&transparent));
 193 }
 194
 195 static gboolean
 196 value_is_done_parsing (GtkCssParser *parser)
 197 {
 198   return _gtk_css_parser_is_eof (parser) ||
 199          _gtk_css_parser_begins_with (parser, ',') ||
 200          _gtk_css_parser_begins_with (parser, ';') ||
 201          _gtk_css_parser_begins_with (parser, '}');
 202 }
 203
 204 GtkCssValue *
 205 _gtk_css_shadow_value_parse (GtkCssParser *parser)
 206 {
 207   enum {
 208     HOFFSET,
 209     VOFFSET,
 210     RADIUS,
 211     SPREAD,
 212     COLOR,
 213     N_VALUES
 214   };
 215   GtkCssValue *values[N_VALUES] = { NULL, };
 216   gboolean inset;
 217   guint i;
 218
 219   inset = _gtk_css_parser_try (parser, "inset", TRUE);
 220
 221   do
 222   {
 223     if (values[HOFFSET] == NULL &&
 224          _gtk_css_parser_has_number (parser))
 225       {
 226         values[HOFFSET] = _gtk_css_number_value_parse (parser,
 227                                                        GTK_CSS_PARSE_LENGTH
 228                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 229         if (values[HOFFSET] == NULL)
 230           goto fail;
 231
 232         values[VOFFSET] = _gtk_css_number_value_parse (parser,
 233                                                        GTK_CSS_PARSE_LENGTH
 234                                                        | GTK_CSS_NUMBER_AS_PIXELS);
 235         if (values[VOFFSET] == NULL)
 236           goto fail;
 237
 238         if (_gtk_css_parser_has_number (parser))
 239           {
 240             values[RADIUS] = _gtk_css_number_value_parse (parser,
 241                                                           GTK_CSS_PARSE_LENGTH
 242                                                           | GTK_CSS_POSITIVE_ONLY
 243                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 244             if (values[RADIUS] == NULL)
 245               goto fail;
 246           }
 247         else
 248           values[RADIUS] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 249
 250         if (_gtk_css_parser_has_number (parser))
 251           {
 252             values[SPREAD] = _gtk_css_number_value_parse (parser,
 253                                                           GTK_CSS_PARSE_LENGTH
 254                                                           | GTK_CSS_NUMBER_AS_PIXELS);
 255             if (values[SPREAD] == NULL)
 256               goto fail;
 257           }
 258         else
 259           values[SPREAD] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
 260       }
 261     else if (!inset && _gtk_css_parser_try (parser, "inset", TRUE))
 262       {
 263         if (values[HOFFSET] == NULL)
 264           goto fail;
 265         inset = TRUE;
 266         break;
 267       }
 268     else if (values[COLOR] == NULL)
 269       {
 270         values[COLOR] = _gtk_css_symbolic_value_new (parser);
 271
 272         if (values[COLOR] == NULL)
 273           goto fail;
 274       }
 275     else
 276       {
 277         /* We parsed everything and there's still stuff left?
 278          * Pretend we didn't notice and let the normal code produce
 279          * a 'junk at end of value' error */
 280         goto fail;
 281       }
 282   }
 283   while (values[HOFFSET] == NULL || !value_is_done_parsing (parser));
 284
 285   if (values[COLOR] == NULL)
 286     values[COLOR] = _gtk_css_symbolic_value_new_take_symbolic_color (
 287                       gtk_symbolic_color_ref (
 288                         _gtk_symbolic_color_get_current_color ()));
 289
 290   return gtk_css_shadow_value_new (values[HOFFSET], values[VOFFSET],
 291                                    values[RADIUS], values[SPREAD],
 292                                    inset, values[COLOR]);
 293
 294 fail:
 295   for (i = 0; i < N_VALUES; i++)
 296     {
 297       if (values[i])
 298         _gtk_css_value_unref (values[i]);
 299     }
 300
 301   return NULL;
 302 }
 303
 304 void
 305 _gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
 306                                     cairo_t           *cr,
 307                                     PangoLayout       *layout)
 308 {
 309   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 310
 311   if (!cairo_has_current_point (cr))
 312     cairo_move_to (cr, 0, 0);
 313
 314   cairo_save (cr);
 315
 316   cairo_rel_move_to (cr,
 317                      _gtk_css_number_value_get (shadow->hoffset, 0),
 318                      _gtk_css_number_value_get (shadow->voffset, 0));
 319   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 320   _gtk_pango_fill_layout (cr, layout);
 321
 322   cairo_rel_move_to (cr,
 323                      - _gtk_css_number_value_get (shadow->hoffset, 0),
 324                      - _gtk_css_number_value_get (shadow->voffset, 0));
 325   cairo_restore (cr);
 326 }
 327
 328 void
 329 _gtk_css_shadow_value_paint_icon (const GtkCssValue *shadow,
 330                                   cairo_t           *cr)
 331 {
 332   cairo_pattern_t *pattern;
 333
 334   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 335
 336   cairo_save (cr);
 337   pattern = cairo_pattern_reference (cairo_get_source (cr));
 338   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 339
 340   cairo_translate (cr,
 341                    _gtk_css_number_value_get (shadow->hoffset, 0),
 342                    _gtk_css_number_value_get (shadow->voffset, 0));
 343   cairo_mask (cr, pattern);
 344
 345   cairo_restore (cr);
 346   cairo_pattern_destroy (pattern);
 347 }
 348
 349 void
 350 _gtk_css_shadow_value_paint_spinner (const GtkCssValue *shadow,
 351                                      cairo_t           *cr,
 352                                      gdouble            radius,
 353                                      gdouble            progress)
 354 {
 355   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 356
 357   cairo_save (cr);
 358
 359   cairo_translate (cr,
 360                    _gtk_css_number_value_get (shadow->hoffset, 0),
 361                    _gtk_css_number_value_get (shadow->voffset, 0));
 362   _gtk_theming_engine_paint_spinner (cr,
 363                                      radius, progress,
 364                                      _gtk_css_rgba_value_get_rgba (shadow->color));
 365
 366   cairo_restore (cr);
 367 }
 368
 369 void
 370 _gtk_css_shadow_value_paint_box (const GtkCssValue   *shadow,
 371                                  cairo_t             *cr,
 372                                  const GtkRoundedBox *padding_box)
 373 {
 374   GtkRoundedBox box;
 375   double spread;
 376
 377   g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
 378
 379   cairo_save (cr);
 380   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
 381
 382   _gtk_rounded_box_path (padding_box, cr);
 383   cairo_clip (cr);
 384
 385   box = *padding_box;
 386   _gtk_rounded_box_move (&box,
 387                          _gtk_css_number_value_get (shadow->hoffset, 0),
 388                          _gtk_css_number_value_get (shadow->voffset, 0));
 389   spread = _gtk_css_number_value_get (shadow->spread, 0);
 390   _gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
 391
 392   _gtk_rounded_box_path (&box, cr);
 393   _gtk_rounded_box_clip_path (padding_box, cr);
 394
 395   gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
 396   cairo_fill (cr);
 397
 398   cairo_restore (cr);
 399 }