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                                          progress);
  50       if (value == NULL)
  51         value = _gtk_css_value_ref (transition->end);
  52     }
  53
  54   _gtk_css_computed_values_set_value (values, transition->property, value, NULL);
  55   _gtk_css_value_unref (value);
  56
  57   return _gtk_bitmask_set (changed, transition->property, TRUE);
  58 }
  59
  60 static gboolean
  61 gtk_css_transition_is_finished (GtkStyleAnimation *animation,
  62                                 gint64             at_time_us)
  63 {
  64   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
  65
  66   return at_time_us >= transition->end_time;
  67 }
  68
  69 static void
  70 gtk_css_transition_finalize (GObject *object)
  71 {
  72   GtkCssTransition *transition = GTK_CSS_TRANSITION (object);
  73
  74   _gtk_css_value_unref (transition->start);
  75   _gtk_css_value_unref (transition->end);
  76   _gtk_css_value_unref (transition->ease);
  77
  78   G_OBJECT_CLASS (_gtk_css_transition_parent_class)->finalize (object);
  79 }
  80
  81 static void
  82 _gtk_css_transition_class_init (GtkCssTransitionClass *klass)
  83 {
  84   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  85   GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
  86
  87   object_class->finalize = gtk_css_transition_finalize;
  88
  89   animation_class->set_values = gtk_css_transition_set_values;
  90   animation_class->is_finished = gtk_css_transition_is_finished;
  91 }
  92
  93 static void
  94 _gtk_css_transition_init (GtkCssTransition *transition)
  95 {
  96 }
  97
  98 GtkStyleAnimation *
  99 _gtk_css_transition_new (guint        property,
 100                          GtkCssValue *start,
 101                          GtkCssValue *end,
 102                          GtkCssValue *ease,
 103                          gint64       start_time_us,
 104                          gint64       end_time_us)
 105 {
 106   GtkCssTransition *transition;
 107
 108   g_return_val_if_fail (start != NULL, NULL);
 109   g_return_val_if_fail (end != NULL, NULL);
 110   g_return_val_if_fail (ease != NULL, NULL);
 111   g_return_val_if_fail (start_time_us <= end_time_us, NULL);
 112
 113   transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
 114
 115   transition->property = property;
 116   transition->start = _gtk_css_value_ref (start);
 117   transition->end = _gtk_css_value_ref (end);
 118   transition->ease = _gtk_css_value_ref (ease);
 119   transition->start_time = start_time_us;
 120   transition->end_time = end_time_us;
 121
 122   return GTK_STYLE_ANIMATION (transition);
 123 }
 124
 125 guint
 126 _gtk_css_transition_get_property (GtkCssTransition *transition)
 127 {
 128   g_return_val_if_fail (GTK_IS_CSS_TRANSITION (transition), 0);
 129
 130   return transition->property;
 131 }