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 "gtkcssstylepropertyprivate.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                                GtkStyleContext    *context,
  40                                GtkCssDependencies *dependencies)
  41 {
  42   GtkStyleContext *parent = gtk_style_context_get_parent (context);
  43
  44   if (parent)
  45     {
  46       *dependencies = GTK_CSS_EQUALS_PARENT;
  47       return _gtk_css_value_ref (_gtk_style_context_peek_property (parent, property_id));
  48     }
  49   else
  50     {
  51       return _gtk_css_value_compute (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (property_id)),
  52                                      property_id,
  53                                      context,
  54                                      dependencies);
  55     }
  56 }
  57
  58 static gboolean
  59 gtk_css_value_inherit_equal (const GtkCssValue *value1,
  60                              const GtkCssValue *value2)
  61 {
  62   return TRUE;
  63 }
  64
  65 static GtkCssValue *
  66 gtk_css_value_inherit_transition (GtkCssValue *start,
  67                                   GtkCssValue *end,
  68                                   double       progress)
  69 {
  70   return NULL;
  71 }
  72
  73 static void
  74 gtk_css_value_inherit_print (const GtkCssValue *value,
  75                              GString           *string)
  76 {
  77   g_string_append (string, "inherit");
  78 }
  79
  80 static const GtkCssValueClass GTK_CSS_VALUE_INHERIT = {
  81   gtk_css_value_inherit_free,
  82   gtk_css_value_inherit_compute,
  83   gtk_css_value_inherit_equal,
  84   gtk_css_value_inherit_transition,
  85   gtk_css_value_inherit_print
  86 };
  87
  88 static GtkCssValue inherit = { &GTK_CSS_VALUE_INHERIT, 1 };
  89
  90 GtkCssValue *
  91 _gtk_css_inherit_value_new (void)
  92 {
  93   return _gtk_css_value_ref (&inherit);
  94 }