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