Pileus Git - ~andy/gtk/blob - gtk/gtkcssanimation.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 "gtkcssanimationprivate.h"
  23
  24 #include "gtkcsseasevalueprivate.h"
  25
  26 #include <math.h>
  27
  28 G_DEFINE_TYPE (GtkCssAnimation, _gtk_css_animation, GTK_TYPE_STYLE_ANIMATION)
  29
  30 /* NB: Return value can be negative and +-Inf */
  31 static double
  32 gtk_css_animation_get_iteration (GtkCssAnimation *animation,
  33                                  gint64           for_time_us)
  34 {
  35   gint64 elapsed;
  36   double iterations;
  37
  38   elapsed = for_time_us - animation->timestamp;
  39   iterations = (double) elapsed / animation->duration;
  40
  41   return iterations;
  42 }
  43
  44 static gboolean
  45 gtk_css_animation_is_executing_at_iteration (GtkCssAnimation *animation,
  46                                              double           iteration)
  47 {
  48   switch (animation->fill_mode)
  49     {
  50     case GTK_CSS_FILL_NONE:
  51       return iteration >= 0 && iteration <= animation->iteration_count;
  52     case GTK_CSS_FILL_FORWARDS:
  53       return iteration >= 0;
  54     case GTK_CSS_FILL_BACKWARDS:
  55       return iteration <= animation->iteration_count;
  56     case GTK_CSS_FILL_BOTH:
  57       return TRUE;
  58     default:
  59       g_return_val_if_reached (FALSE);
  60     }
  61 }
  62
  63 static double
  64 gtk_css_animation_get_progress_from_iteration (GtkCssAnimation *animation,
  65                                                double           iteration)
  66 {
  67   double d;
  68
  69   iteration = CLAMP (iteration, 0, animation->iteration_count);
  70
  71   switch (animation->direction)
  72     {
  73     case GTK_CSS_DIRECTION_NORMAL:
  74       if (iteration == animation->iteration_count)
  75         return 1;
  76       else
  77         return iteration - floor (iteration);
  78     case GTK_CSS_DIRECTION_REVERSE:
  79       if (iteration == animation->iteration_count)
  80         return 1;
  81       else
  82         return ceil (iteration) - iteration;
  83     case GTK_CSS_DIRECTION_ALTERNATE:
  84       d = floor (iteration);
  85       if (fmod (d, 2))
  86         return iteration - d;
  87       else
  88         return 1 + d - iteration;
  89     case GTK_CSS_DIRECTION_ALTERNATE_REVERSE:
  90       d = floor (iteration);
  91       if (fmod (d, 2))
  92         return 1 + d - iteration;
  93       else
  94         return iteration - d;
  95     default:
  96       g_return_val_if_reached (0);
  97     }
  98 }
  99
 100 static void
 101 gtk_css_animation_set_values (GtkStyleAnimation    *style_animation,
 102                               gint64                for_time_us,
 103                               GtkCssComputedValues *values)
 104 {
 105   GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
 106   double iteration, progress;
 107   guint i;
 108
 109   iteration = gtk_css_animation_get_iteration (animation, for_time_us);
 110
 111   if (!gtk_css_animation_is_executing_at_iteration (animation, iteration))
 112     return;
 113
 114   progress = gtk_css_animation_get_progress_from_iteration (animation, iteration);
 115   progress = _gtk_css_ease_value_transform (animation->ease, progress);
 116
 117   for (i = 0; i < _gtk_css_keyframes_get_n_properties (animation->keyframes); i++)
 118     {
 119       GtkCssValue *value;
 120       guint property_id;
 121
 122       property_id = _gtk_css_keyframes_get_property_id (animation->keyframes, i);
 123
 124       value = _gtk_css_keyframes_get_value (animation->keyframes,
 125                                             i,
 126                                             progress,
 127                                             _gtk_css_computed_values_get_intrinsic_value (values, i));
 128       _gtk_css_computed_values_set_animated_value (values, property_id, value);
 129       _gtk_css_value_unref (value);
 130     }
 131 }
 132
 133 static gboolean
 134 gtk_css_animation_is_finished (GtkStyleAnimation *style_animation,
 135                                gint64             at_time_us)
 136 {
 137   return FALSE;
 138 }
 139
 140 static gboolean
 141 gtk_css_animation_is_static (GtkStyleAnimation *style_animation,
 142                              gint64             at_time_us)
 143 {
 144   GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
 145   double iteration;
 146
 147   iteration = gtk_css_animation_get_iteration (animation, at_time_us);
 148
 149   return iteration >= animation->iteration_count;
 150 }
 151
 152 static void
 153 gtk_css_animation_finalize (GObject *object)
 154 {
 155   GtkCssAnimation *animation = GTK_CSS_ANIMATION (object);
 156
 157   g_free (animation->name);
 158   _gtk_css_keyframes_unref (animation->keyframes);
 159   _gtk_css_value_unref (animation->ease);
 160
 161   G_OBJECT_CLASS (_gtk_css_animation_parent_class)->finalize (object);
 162 }
 163
 164 static void
 165 _gtk_css_animation_class_init (GtkCssAnimationClass *klass)
 166 {
 167   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 168   GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
 169
 170   object_class->finalize = gtk_css_animation_finalize;
 171
 172   animation_class->set_values = gtk_css_animation_set_values;
 173   animation_class->is_finished = gtk_css_animation_is_finished;
 174   animation_class->is_static = gtk_css_animation_is_static;
 175 }
 176
 177 static void
 178 _gtk_css_animation_init (GtkCssAnimation *animation)
 179 {
 180 }
 181
 182 GtkStyleAnimation *
 183 _gtk_css_animation_new (const char      *name,
 184                         GtkCssKeyframes *keyframes,
 185                         gint64           start_time_us,
 186                         gint64           duration_us,
 187                         GtkCssValue     *ease,
 188                         GtkCssDirection  direction,
 189                         GtkCssPlayState  play_state,
 190                         GtkCssFillMode   fill_mode,
 191                         double           iteration_count)
 192 {
 193   GtkCssAnimation *animation;
 194
 195   g_return_val_if_fail (name != NULL, NULL);
 196   g_return_val_if_fail (keyframes != NULL, NULL);
 197   g_return_val_if_fail (ease != NULL, NULL);
 198   g_return_val_if_fail (iteration_count >= 0, NULL);
 199
 200   animation = g_object_new (GTK_TYPE_CSS_ANIMATION, NULL);
 201
 202   animation->name = g_strdup (name);
 203   animation->keyframes = _gtk_css_keyframes_ref (keyframes);
 204   animation->timestamp = start_time_us;
 205   animation->duration = duration_us;
 206   animation->ease = _gtk_css_value_ref (ease);
 207   animation->direction = direction;
 208   animation->play_state = play_state;
 209   animation->fill_mode = fill_mode;
 210   animation->iteration_count = iteration_count;
 211
 212   return GTK_STYLE_ANIMATION (animation);
 213 }
 214
 215 const char *
 216 _gtk_css_animation_get_name (GtkCssAnimation *animation)
 217 {
 218   g_return_val_if_fail (GTK_IS_CSS_ANIMATION (animation), NULL);
 219
 220   return animation->name;
 221 }