Pileus Git - ~andy/gtk/blob - gtk/gtkcssimagevalue.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 "gtkcssimagevalueprivate.h"
  21
  22 #include "gtkcssimagecrossfadeprivate.h"
  23
  24 struct _GtkCssValue {
  25   GTK_CSS_VALUE_BASE
  26   GtkCssImage *image;
  27 };
  28
  29 static void
  30 gtk_css_value_image_free (GtkCssValue *value)
  31 {
  32   g_object_unref (value->image);
  33   g_slice_free (GtkCssValue, value);
  34 }
  35
  36 static gboolean
  37 gtk_css_value_image_equal (const GtkCssValue *value1,
  38                            const GtkCssValue *value2)
  39 {
  40   return value1->image == value2->image;
  41 }
  42
  43 static GtkCssValue *
  44 gtk_css_value_image_transition (GtkCssValue *start,
  45                                 GtkCssValue *end,
  46                                 double       progress)
  47 {
  48   GtkCssImage *fade;
  49
  50   fade = _gtk_css_image_cross_fade_new (_gtk_css_image_value_get_image (start),
  51                                         _gtk_css_image_value_get_image (end),
  52                                         progress);
  53
  54   return _gtk_css_image_value_new (fade);
  55 }
  56
  57 static void
  58 gtk_css_value_image_print (const GtkCssValue *value,
  59                            GString           *string)
  60 {
  61   if (value->image)
  62     _gtk_css_image_print (value->image, string);
  63   else
  64     g_string_append (string, "none");
  65 }
  66
  67 static const GtkCssValueClass GTK_CSS_VALUE_IMAGE = {
  68   gtk_css_value_image_free,
  69   gtk_css_value_image_equal,
  70   gtk_css_value_image_transition,
  71   gtk_css_value_image_print
  72 };
  73
  74 GtkCssValue *
  75 _gtk_css_image_value_new (GtkCssImage *image)
  76 {
  77   static GtkCssValue none_singleton = { &GTK_CSS_VALUE_IMAGE, 1, NULL };
  78   GtkCssValue *value;
  79
  80   if (image == NULL)
  81     return _gtk_css_value_ref (&none_singleton);
  82
  83   value = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_IMAGE);
  84   value->image = image;
  85
  86   return value;
  87 }
  88
  89 GtkCssImage *
  90 _gtk_css_image_value_get_image (const GtkCssValue *value)
  91 {
  92   g_return_val_if_fail (value->class == &GTK_CSS_VALUE_IMAGE, NULL);
  93
  94   return value->image;
  95 }
  96