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

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2011 Red Hat, Inc.
   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 "gtkcssinheritvalueprivate.h"
  21
  22 #include "gtkcssinitialvalueprivate.h"
  23 #include "gtkstylecontextprivate.h"
  24
  25 struct _GtkCssValue {
  26   GTK_CSS_VALUE_BASE
  27 };
  28
  29 static void
  30 gtk_css_value_inherit_free (GtkCssValue *value)
  31 {
  32   /* Can only happen if the unique value gets unreffed too often */
  33   g_assert_not_reached ();
  34 }
  35
  36 static GtkCssValue *
  37 gtk_css_value_inherit_compute (GtkCssValue             *value,
  38                                guint                    property_id,
  39                                GtkStyleProviderPrivate *provider,
  40                                GtkCssComputedValues    *values,
  41                                GtkCssComputedValues    *parent_values,
  42                                GtkCssDependencies      *dependencies)
  43 {
  44   if (parent_values)
  45     {
  46       *dependencies = GTK_CSS_EQUALS_PARENT;
  47       return _gtk_css_value_ref (_gtk_css_computed_values_get_value (parent_values, property_id));
  48     }
  49   else
  50     {
  51       return _gtk_css_value_compute (_gtk_css_initial_value_get (),
  52                                      property_id,
  53                                      provider,
  54                                      values,
  55                                      parent_values,
  56                                      dependencies);
  57     }
  58 }
  59
  60 static gboolean
  61 gtk_css_value_inherit_equal (const GtkCssValue *value1,
  62                              const GtkCssValue *value2)
  63 {
  64   return TRUE;
  65 }
  66
  67 static GtkCssValue *
  68 gtk_css_value_inherit_transition (GtkCssValue *start,
  69                                   GtkCssValue *end,
  70                                   guint        property_id,
  71                                   double       progress)
  72 {
  73   return NULL;
  74 }
  75
  76 static void
  77 gtk_css_value_inherit_print (const GtkCssValue *value,
  78                              GString           *string)
  79 {
  80   g_string_append (string, "inherit");
  81 }
  82
  83 static const GtkCssValueClass GTK_CSS_VALUE_INHERIT = {
  84   gtk_css_value_inherit_free,
  85   gtk_css_value_inherit_compute,
  86   gtk_css_value_inherit_equal,
  87   gtk_css_value_inherit_transition,
  88   gtk_css_value_inherit_print
  89 };
  90
  91 static GtkCssValue inherit = { &GTK_CSS_VALUE_INHERIT, 1 };
  92
  93 GtkCssValue *
  94 _gtk_css_inherit_value_new (void)
  95 {
  96   return _gtk_css_value_ref (&inherit);
  97 }