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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Benjamin Otte <otte@gnome.org>
   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 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
  18 #include "config.h"
  19
  20 #include "gtkcsstypesprivate.h"
  21
  22 #include "gtkcssnumbervalueprivate.h"
  23 #include "gtkstylecontextprivate.h"
  24
  25 #define DEFINE_BOXED_TYPE_WITH_COPY_FUNC(TypeName, type_name) \
  26 \
  27 static TypeName * \
  28 type_name ## _copy (const TypeName *foo) \
  29 { \
  30   return g_memdup (foo, sizeof (TypeName)); \
  31 } \
  32 \
  33 G_DEFINE_BOXED_TYPE (TypeName, type_name, type_name ## _copy, g_free)
  34
  35 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBackgroundSize, _gtk_css_background_size)
  36 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBackgroundPosition, _gtk_css_background_position)
  37 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBorderImageRepeat, _gtk_css_border_image_repeat)
  38
  39 typedef struct _GtkCssChangeTranslation GtkCssChangeTranslation;
  40 struct _GtkCssChangeTranslation {
  41   GtkCssChange from;
  42   GtkCssChange to;
  43 };
  44
  45 static GtkCssChange
  46 gtk_css_change_translate (GtkCssChange                   match,
  47                          const GtkCssChangeTranslation *translations,
  48                          guint                         n_translations)
  49 {
  50   GtkCssChange result = match;
  51   guint i;
  52
  53   for (i = 0; i < n_translations; i++)
  54     {
  55       if (match & translations[i].from)
  56         {
  57           result &= ~translations[i].from;
  58           result |= translations[i].to;
  59         }
  60     }
  61
  62   return result;
  63 }
  64
  65 GtkCssChange
  66 _gtk_css_change_for_sibling (GtkCssChange match)
  67 {
  68   static const GtkCssChangeTranslation table[] = {
  69     { GTK_CSS_CHANGE_CLASS, GTK_CSS_CHANGE_SIBLING_CLASS },
  70     { GTK_CSS_CHANGE_NAME, GTK_CSS_CHANGE_SIBLING_NAME },
  71     { GTK_CSS_CHANGE_POSITION, GTK_CSS_CHANGE_SIBLING_POSITION },
  72     { GTK_CSS_CHANGE_STATE, GTK_CSS_CHANGE_SIBLING_STATE },
  73   };
  74
  75   return gtk_css_change_translate (match, table, G_N_ELEMENTS (table));
  76 }
  77
  78 GtkCssChange
  79 _gtk_css_change_for_child (GtkCssChange match)
  80 {
  81   static const GtkCssChangeTranslation table[] = {
  82     { GTK_CSS_CHANGE_CLASS, GTK_CSS_CHANGE_PARENT_CLASS },
  83     { GTK_CSS_CHANGE_NAME, GTK_CSS_CHANGE_PARENT_NAME },
  84     { GTK_CSS_CHANGE_POSITION, GTK_CSS_CHANGE_PARENT_POSITION },
  85     { GTK_CSS_CHANGE_STATE, GTK_CSS_CHANGE_PARENT_STATE },
  86     { GTK_CSS_CHANGE_SIBLING_CLASS, GTK_CSS_CHANGE_PARENT_SIBLING_CLASS },
  87     { GTK_CSS_CHANGE_SIBLING_NAME, GTK_CSS_CHANGE_PARENT_SIBLING_NAME },
  88     { GTK_CSS_CHANGE_SIBLING_POSITION, GTK_CSS_CHANGE_PARENT_SIBLING_POSITION },
  89     { GTK_CSS_CHANGE_SIBLING_STATE, GTK_CSS_CHANGE_PARENT_SIBLING_STATE }
  90   };
  91
  92   return gtk_css_change_translate (match, table, G_N_ELEMENTS (table));
  93 }
  94
  95 void
  96 _gtk_css_number_init (GtkCssNumber *number,
  97                       double        value,
  98                       GtkCssUnit    unit)
  99 {
 100   number->value = value;
 101   number->unit = unit;
 102 }
 103
 104 gboolean
 105 _gtk_css_number_equal (const GtkCssNumber *one,
 106                        const GtkCssNumber *two)
 107 {
 108   return one->unit == two->unit &&
 109          one->value == two->value;
 110 }
 111
 112 double
 113 _gtk_css_number_get (const GtkCssNumber *number,
 114                      double              one_hundred_percent)
 115 {
 116   if (number->unit == GTK_CSS_PERCENT)
 117     return number->value * one_hundred_percent * 0.01;
 118   else
 119     return number->value;
 120 }
 121
 122 gboolean
 123 _gtk_css_number_compute (GtkCssNumber       *dest,
 124                          const GtkCssNumber *src,
 125                          GtkStyleContext    *context)
 126 {
 127   switch (src->unit)
 128     {
 129     default:
 130       g_assert_not_reached();
 131       /* fall through */
 132     case GTK_CSS_PERCENT:
 133     case GTK_CSS_NUMBER:
 134     case GTK_CSS_PX:
 135     case GTK_CSS_DEG:
 136       dest->value = src->value;
 137       dest->unit = src->unit;
 138       break;
 139     case GTK_CSS_PT:
 140       dest->value = src->value * 96.0 / 72.0;
 141       dest->unit = GTK_CSS_PX;
 142       break;
 143     case GTK_CSS_PC:
 144       dest->value = src->value * 96.0 / 72.0 * 12.0;
 145       dest->unit = GTK_CSS_PX;
 146       break;
 147     case GTK_CSS_IN:
 148       dest->value = src->value * 96.0;
 149       dest->unit = GTK_CSS_PX;
 150       break;
 151     case GTK_CSS_CM:
 152       dest->value = src->value * 96.0 * 0.39370078740157477;
 153       dest->unit = GTK_CSS_PX;
 154       break;
 155     case GTK_CSS_MM:
 156       dest->value = src->value * 96.0 * 0.039370078740157477;
 157       dest->unit = GTK_CSS_PX;
 158       break;
 159     case GTK_CSS_EM:
 160       dest->value = src->value * _gtk_css_number_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_FONT_SIZE), 100);
 161       dest->unit = GTK_CSS_PX;
 162       break;
 163     case GTK_CSS_EX:
 164       /* for now we pretend ex is half of em */
 165       dest->value = src->value * _gtk_css_number_value_get (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_FONT_SIZE), 100);
 166       dest->unit = GTK_CSS_PX;
 167       break;
 168     case GTK_CSS_RAD:
 169       dest->value = 360 * src->value / (2 * G_PI);
 170       dest->unit = GTK_CSS_DEG;
 171       break;
 172     case GTK_CSS_GRAD:
 173       dest->value = 360 * src->value / 400.0;
 174       dest->unit = GTK_CSS_DEG;
 175       break;
 176     case GTK_CSS_TURN:
 177       dest->value = 360 * src->value;
 178       dest->unit = GTK_CSS_DEG;
 179       break;
 180     }
 181
 182   return !_gtk_css_number_equal (src, dest);
 183 }
 184
 185 void
 186 _gtk_css_number_print (const GtkCssNumber *number,
 187                        GString            *string)
 188 {
 189   char buf[G_ASCII_DTOSTR_BUF_SIZE];
 190
 191   const char *names[] = {
 192     /* [GTK_CSS_NUMBER] = */ "",
 193     /* [GTK_CSS_PERCENT] = */ "%",
 194     /* [GTK_CSS_PX] = */ "px",
 195     /* [GTK_CSS_PT] = */ "pt",
 196     /* [GTK_CSS_EM] = */ "em",
 197     /* [GTK_CSS_EX] = */ "ex",
 198     /* [GTK_CSS_PC] = */ "pc",
 199     /* [GTK_CSS_IN] = */ "in",
 200     /* [GTK_CSS_CM] = */ "cm",
 201     /* [GTK_CSS_MM] = */ "mm",
 202     /* [GTK_CSS_RAD] = */ "rad",
 203     /* [GTK_CSS_DEG] = */ "deg",
 204     /* [GTK_CSS_GRAD] = */ "grad",
 205     /* [GTK_CSS_TURN] = */ "turn",
 206   };
 207
 208   g_return_if_fail (number != NULL);
 209   g_return_if_fail (string != NULL);
 210
 211   g_ascii_dtostr (buf, sizeof (buf), number->value);
 212   g_string_append (string, buf);
 213   if (number->value != 0.0)
 214     g_string_append (string, names[number->unit]);
 215 }