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 void
  29 gtk_css_transition_set_values (GtkStyleAnimation    *animation,
  30                                gint64                for_time_us,
  31                                GtkCssComputedValues *values)
  32 {
  33   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
  34   GtkCssValue *value, *end;
  35   double progress;
  36
  37   end = _gtk_css_computed_values_get_intrinsic_value (values, transition->property);
  38
  39   if (transition->start_time >= for_time_us)
  40     value = _gtk_css_value_ref (transition->start);
  41   else if (transition->end_time > for_time_us)
  42     {
  43       progress = (double) (for_time_us - transition->start_time) / (transition->end_time - transition->start_time);
  44       progress = _gtk_css_ease_value_transform (transition->ease, progress);
  45
  46       value = _gtk_css_value_transition (transition->start,
  47                                          end,
  48                                          transition->property,
  49                                          progress);
  50       if (value == NULL)
  51         value = _gtk_css_value_ref (end);
  52     }
  53   else
  54     value = NULL;
  55
  56   if (value)
  57     {
  58       _gtk_css_computed_values_set_animated_value (values, transition->property, value);
  59       _gtk_css_value_unref (value);
  60     }
  61 }
  62
  63 static gboolean
  64 gtk_css_transition_is_finished (GtkStyleAnimation *animation,
  65                                 gint64             at_time_us)
  66 {
  67   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
  68
  69   return at_time_us >= transition->end_time;
  70 }
  71
  72 static gboolean
  73 gtk_css_transition_is_static (GtkStyleAnimation *animation,
  74                               gint64             at_time_us)
  75 {
  76   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
  77
  78   return at_time_us >= transition->end_time;
  79 }
  80
  81 static void
  82 gtk_css_transition_finalize (GObject *object)
  83 {
  84   GtkCssTransition *transition = GTK_CSS_TRANSITION (object);
  85
  86   _gtk_css_value_unref (transition->start);
  87   _gtk_css_value_unref (transition->ease);
  88
  89   G_OBJECT_CLASS (_gtk_css_transition_parent_class)->finalize (object);
  90 }
  91
  92 static void
  93 _gtk_css_transition_class_init (GtkCssTransitionClass *klass)
  94 {
  95   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  96   GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
  97
  98   object_class->finalize = gtk_css_transition_finalize;
  99
 100   animation_class->set_values = gtk_css_transition_set_values;
 101   animation_class->is_finished = gtk_css_transition_is_finished;
 102   animation_class->is_static = gtk_css_transition_is_static;
 103 }
 104
 105 static void
 106 _gtk_css_transition_init (GtkCssTransition *transition)
 107 {
 108 }
 109
 110 GtkStyleAnimation *
 111 _gtk_css_transition_new (guint        property,
 112                          GtkCssValue *start,
 113                          GtkCssValue *ease,
 114                          gint64       start_time_us,
 115                          gint64       end_time_us)
 116 {
 117   GtkCssTransition *transition;
 118
 119   g_return_val_if_fail (start != NULL, NULL);
 120   g_return_val_if_fail (ease != NULL, NULL);
 121   g_return_val_if_fail (start_time_us <= end_time_us, NULL);
 122
 123   transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
 124
 125   transition->property = property;
 126   transition->start = _gtk_css_value_ref (start);
 127   transition->ease = _gtk_css_value_ref (ease);
 128   transition->start_time = start_time_us;
 129   transition->end_time = end_time_us;
 130
 131   return GTK_STYLE_ANIMATION (transition);
 132 }
 133
 134 guint
 135 _gtk_css_transition_get_property (GtkCssTransition *transition)
 136 {
 137   g_return_val_if_fail (GTK_IS_CSS_TRANSITION (transition), 0);
 138
 139   return transition->property;
 140 }