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 (GtkCssBackgroundSize, _gtk_css_background_size)
  36 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBorderCornerRadius, _gtk_css_border_corner_radius)
  37 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssBorderImageRepeat, _gtk_css_border_image_repeat)
  38 DEFINE_BOXED_TYPE_WITH_COPY_FUNC (GtkCssNumber, _gtk_css_number)
  39
  40 void
  41 _gtk_css_number_init (GtkCssNumber *number,
  42                       double        value,
  43                       GtkCssUnit    unit)
  44 {
  45   number->value = value;
  46   number->unit = unit;
  47 }
  48
  49 gboolean
  50 _gtk_css_number_equal (const GtkCssNumber *one,
  51                        const GtkCssNumber *two)
  52 {
  53   return one->unit == two->unit &&
  54          one->value == two->value;
  55 }
  56
  57 double
  58 _gtk_css_number_get (const GtkCssNumber *number,
  59                      double              one_hundred_percent)
  60 {
  61   if (number->unit == GTK_CSS_PERCENT)
  62     return number->value * one_hundred_percent * 0.01;
  63   else
  64     return number->value;
  65 }
  66
  67 void
  68 _gtk_css_number_compute (GtkCssNumber       *dest,
  69                          const GtkCssNumber *src,
  70                          GtkStyleContext    *context)
  71 {
  72   switch (src->unit)
  73     {
  74     default:
  75       g_assert_not_reached();
  76       /* fall through */
  77     case GTK_CSS_PERCENT:
  78     case GTK_CSS_NUMBER:
  79     case GTK_CSS_PX:
  80     case GTK_CSS_DEG:
  81       dest->value = src->value;
  82       dest->unit = src->unit;
  83       break;
  84     case GTK_CSS_PT:
  85       dest->value = src->value * 96.0 / 72.0;
  86       dest->unit = GTK_CSS_PX;
  87       break;
  88     case GTK_CSS_PC:
  89       dest->value = src->value * 96.0 / 72.0 * 12.0;
  90       dest->unit = GTK_CSS_PX;
  91       break;
  92     case GTK_CSS_IN:
  93       dest->value = src->value * 96.0;
  94       dest->unit = GTK_CSS_PX;
  95       break;
  96     case GTK_CSS_CM:
  97       dest->value = src->value * 96.0 * 0.39370078740157477;
  98       dest->unit = GTK_CSS_PX;
  99       break;
 100     case GTK_CSS_MM:
 101       dest->value = src->value * 96.0 * 0.039370078740157477;
 102       dest->unit = GTK_CSS_PX;
 103       break;
 104     case GTK_CSS_EM:
 105       dest->value = src->value * g_value_get_double (_gtk_style_context_peek_property (context, "font-size"));
 106       dest->unit = GTK_CSS_PX;
 107       break;
 108     case GTK_CSS_EX:
 109       /* for now we pretend ex is half of em */
 110       dest->value = src->value * g_value_get_double (_gtk_style_context_peek_property (context, "font-size"));
 111       dest->unit = GTK_CSS_PX;
 112       break;
 113     case GTK_CSS_RAD:
 114       dest->value = 360 * src->value / (2 * G_PI);
 115       dest->unit = GTK_CSS_DEG;
 116       break;
 117     case GTK_CSS_GRAD:
 118       dest->value = 360 * src->value / 400.0;
 119       dest->unit = GTK_CSS_DEG;
 120       break;
 121     case GTK_CSS_TURN:
 122       dest->value = 360 * src->value;
 123       dest->unit = GTK_CSS_DEG;
 124       break;
 125     }
 126 }
 127
 128 void
 129 _gtk_css_number_print (const GtkCssNumber *number,
 130                        GString            *string)
 131 {
 132   char buf[G_ASCII_DTOSTR_BUF_SIZE];
 133
 134   const char *names[] = {
 135     /* [GTK_CSS_NUMBER] = */ "",
 136     /* [GTK_CSS_PERCENT] = */ "%",
 137     /* [GTK_CSS_PX] = */ "px",
 138     /* [GTK_CSS_PT] = */ "pt",
 139     /* [GTK_CSS_EM] = */ "em",
 140     /* [GTK_CSS_EX] = */ "ex",
 141     /* [GTK_CSS_PC] = */ "pc",
 142     /* [GTK_CSS_IN] = */ "in",
 143     /* [GTK_CSS_CM] = */ "cm",
 144     /* [GTK_CSS_MM] = */ "mm",
 145     /* [GTK_CSS_RAD] = */ "rad",
 146     /* [GTK_CSS_DEG] = */ "deg",
 147     /* [GTK_CSS_GRAD] = */ "grad",
 148     /* [GTK_CSS_TURN] = */ "turn",
 149   };
 150
 151   g_return_if_fail (number != NULL);
 152   g_return_if_fail (string != NULL);
 153
 154   g_ascii_dtostr (buf, sizeof (buf), number->value);
 155   g_string_append (string, buf);
 156   if (number->value != 0.0)
 157     g_string_append (string, names[number->unit]);
 158 }