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

   1 /*
   2  * Copyright © 2012 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 2.1 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  * Authors: Benjamin Otte <otte@gnome.org>
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gtkcsstransitionprivate.h"
  23
  24 #include "gtkcsseasevalueprivate.h"
  25
  26 G_DEFINE_TYPE (GtkCssTransition, _gtk_css_transition, GTK_TYPE_STYLE_ANIMATION)
  27
  28 static GtkBitmask *
  29 gtk_css_transition_set_values (GtkStyleAnimation    *animation,
  30                                GtkBitmask           *changed,
  31                                gint64                for_time_us,
  32                                GtkCssComputedValues *values)
  33 {
  34   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
  35   GtkCssValue *value;
  36   double progress;
  37
  38   if (transition->start_time >= for_time_us)
  39     value = _gtk_css_value_ref (transition->start);
  40   else if (transition->end_time <= for_time_us)
  41     value = _gtk_css_value_ref (transition->end);
  42   else
  43     {
  44       progress = (double) (for_time_us - transition->start_time) / (transition->end_time - transition->start_time);
  45       progress = _gtk_css_ease_value_transform (transition->ease, progress);
  46
  47       value = _gtk_css_value_transition (transition->start,
  48                                          transition->end,
  49                                          transition->property,
  50                                          progress);
  51       if (value == NULL)
  52         value = _gtk_css_value_ref (transition->end);
  53     }
  54
  55   /* XXX: Is using 0 correct here? */
  56   _gtk_css_computed_values_set_value (values, transition->property, value, 0, NULL);
  57   _gtk_css_value_unref (value);
  58
  59   return _gtk_bitmask_set (changed, transition->property, TRUE);
  60 }
  61
  62 static gboolean
  63 gtk_css_transition_is_finished (GtkStyleAnimation *animation,
  64                                 gint64             at_time_us)
  65 {
  66   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
  67
  68   return at_time_us >= transition->end_time;
  69 }
  70
  71 static void
  72 gtk_css_transition_finalize (GObject *object)
  73 {
  74   GtkCssTransition *transition = GTK_CSS_TRANSITION (object);
  75
  76   _gtk_css_value_unref (transition->start);
  77   _gtk_css_value_unref (transition->end);
  78   _gtk_css_value_unref (transition->ease);
  79
  80   G_OBJECT_CLASS (_gtk_css_transition_parent_class)->finalize (object);
  81 }
  82
  83 static void
  84 _gtk_css_transition_class_init (GtkCssTransitionClass *klass)
  85 {
  86   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  87   GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
  88
  89   object_class->finalize = gtk_css_transition_finalize;
  90
  91   animation_class->set_values = gtk_css_transition_set_values;
  92   animation_class->is_finished = gtk_css_transition_is_finished;
  93 }
  94
  95 static void
  96 _gtk_css_transition_init (GtkCssTransition *transition)
  97 {
  98 }
  99
 100 GtkStyleAnimation *
 101 _gtk_css_transition_new (guint        property,
 102                          GtkCssValue *start,
 103                          GtkCssValue *end,
 104                          GtkCssValue *ease,
 105                          gint64       start_time_us,
 106                          gint64       end_time_us)
 107 {
 108   GtkCssTransition *transition;
 109
 110   g_return_val_if_fail (start != NULL, NULL);
 111   g_return_val_if_fail (end != NULL, NULL);
 112   g_return_val_if_fail (ease != NULL, NULL);
 113   g_return_val_if_fail (start_time_us <= end_time_us, NULL);
 114
 115   transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
 116
 117   transition->property = property;
 118   transition->start = _gtk_css_value_ref (start);
 119   transition->end = _gtk_css_value_ref (end);
 120   transition->ease = _gtk_css_value_ref (ease);
 121   transition->start_time = start_time_us;
 122   transition->end_time = end_time_us;
 123
 124   return GTK_STYLE_ANIMATION (transition);
 125 }
 126
 127 guint
 128 _gtk_css_transition_get_property (GtkCssTransition *transition)
 129 {
 130   g_return_val_if_fail (GTK_IS_CSS_TRANSITION (transition), 0);
 131
 132   return transition->property;
 133 }