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, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gtkcsstypesprivate.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 (GtkCssBorderCornerRadius, _gtk_css_border_corner_radius)
  36 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBorderImageRepeat, _gtk_css_border_image_repeat)
  37 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssNumber, _gtk_css_number)
  38
  39 void
  40 _gtk_css_number_init (GtkCssNumber *number,
  41                       double        value,
  42                       GtkCssUnit    unit)
  43 {
  44   number->value = value;
  45   number->unit = unit;
  46 }
  47
  48 gboolean
  49 _gtk_css_number_equal (const GtkCssNumber *one,
  50                        const GtkCssNumber *two)
  51 {
  52   return one->unit == two->unit &&
  53          one->value == two->value;
  54 }
  55
  56 double
  57 _gtk_css_number_get (const GtkCssNumber *number,
  58                      double              one_hundred_percent)
  59 {
  60   if (number->unit == GTK_CSS_PERCENT)
  61     return number->value * one_hundred_percent * 0.01;
  62   else
  63     return number->value;
  64 }
  65
  66 void
  67 _gtk_css_number_compute (GtkCssNumber       *dest,
  68                          const GtkCssNumber *src,
  69                          GtkStyleContext    *context)
  70 {
  71   switch (src->unit)
  72     {
  73     default:
  74       g_assert_not_reached();
  75       /* fall through */
  76     case GTK_CSS_PERCENT:
  77     case GTK_CSS_NUMBER:
  78     case GTK_CSS_PX:
  79       dest->value = src->value;
  80       dest->unit = src->unit;
  81       break;
  82     case GTK_CSS_PT:
  83       dest->value = src->value * 96.0 / 72.0;
  84       dest->unit = GTK_CSS_PX;
  85       break;
  86     case GTK_CSS_PC:
  87       dest->value = src->value * 96.0 / 72.0 * 12.0;
  88       dest->unit = GTK_CSS_PX;
  89       break;
  90     case GTK_CSS_IN:
  91       dest->value = src->value * 96.0;
  92       dest->unit = GTK_CSS_PX;
  93       break;
  94     case GTK_CSS_CM:
  95       dest->value = src->value * 96.0 * 0.39370078740157477;
  96       dest->unit = GTK_CSS_PX;
  97       break;
  98     case GTK_CSS_MM:
  99       dest->value = src->value * 96.0 * 0.039370078740157477;
 100       dest->unit = GTK_CSS_PX;
 101       break;
 102     case GTK_CSS_EM:
 103       dest->value = src->value * g_value_get_double (_gtk_style_context_peek_property (context, "font-size"));
 104       dest->unit = GTK_CSS_PX;
 105       break;
 106     case GTK_CSS_EX:
 107       /* for now we pretend ex is half of em */
 108       dest->value = src->value * g_value_get_double (_gtk_style_context_peek_property (context, "font-size"));
 109       dest->unit = GTK_CSS_PX;
 110       break;
 111     }
 112 }
 113
 114 void
 115 _gtk_css_number_print (const GtkCssNumber *number,
 116                        GString            *string)
 117 {
 118   char buf[G_ASCII_DTOSTR_BUF_SIZE];
 119
 120   g_return_if_fail (number != NULL);
 121   g_return_if_fail (string != NULL);
 122
 123   const char *names[] = {
 124     /* [GTK_CSS_NUMBER] = */ "",
 125     /* [GTK_CSS_PERCENT] = */ "%",
 126     /* [GTK_CSS_PX] = */ "px",
 127     /* [GTK_CSS_PT] = */ "pt",
 128     /* [GTK_CSS_EM] = */ "em",
 129     /* [GTK_CSS_EX] = */ "ex",
 130     /* [GTK_CSS_PC] = */ "pc",
 131     /* [GTK_CSS_IN] = */ "in",
 132     /* [GTK_CSS_CM] = */ "cm",
 133     /* [GTK_CSS_MM] = */ "mm"
 134   };
 135
 136   g_ascii_dtostr (buf, sizeof (buf), number->value);
 137   g_string_append (string, buf);
 138   if (number->value != 0.0)
 139     g_string_append (string, names[number->unit]);
 140 }