gtk3/gtk/gtkcssanimation.c
Benjamin Otte 7224f897d6 animation: Add _gtk_style_animation_is_static()
This will be useful to not trigger updates all the time when nothing is
happening (ie due to animations being paused or due to them having
reached their final value).
2012-09-17 20:39:12 +02:00

228 lines
6.9 KiB
C

/*
* Copyright © 2012 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkcssanimationprivate.h"
#include "gtkcsseasevalueprivate.h"
#include <math.h>
G_DEFINE_TYPE (GtkCssAnimation, _gtk_css_animation, GTK_TYPE_STYLE_ANIMATION)
/* NB: Return value can be negative and +-Inf */
static double
gtk_css_animation_get_iteration (GtkCssAnimation *animation,
gint64 for_time_us)
{
gint64 elapsed;
double iterations;
elapsed = for_time_us - animation->timestamp;
iterations = (double) elapsed / animation->duration;
return iterations;
}
static gboolean
gtk_css_animation_is_executing_at_iteration (GtkCssAnimation *animation,
double iteration)
{
switch (animation->fill_mode)
{
case GTK_CSS_FILL_NONE:
return iteration >= 0 && iteration <= animation->iteration_count;
case GTK_CSS_FILL_FORWARDS:
return iteration >= 0;
case GTK_CSS_FILL_BACKWARDS:
return iteration <= animation->iteration_count;
case GTK_CSS_FILL_BOTH:
return TRUE;
default:
g_return_val_if_reached (FALSE);
}
}
static double
gtk_css_animation_get_progress_from_iteration (GtkCssAnimation *animation,
double iteration)
{
double d;
iteration = CLAMP (iteration, 0, animation->iteration_count);
switch (animation->direction)
{
case GTK_CSS_DIRECTION_NORMAL:
if (iteration == animation->iteration_count)
return 1;
else
return iteration - floor (iteration);
case GTK_CSS_DIRECTION_REVERSE:
if (iteration == animation->iteration_count)
return 1;
else
return ceil (iteration) - iteration;
case GTK_CSS_DIRECTION_ALTERNATE:
d = floor (iteration);
if (fmod (d, 2))
return iteration - d;
else
return 1 + d - iteration;
case GTK_CSS_DIRECTION_ALTERNATE_REVERSE:
d = floor (iteration);
if (fmod (d, 2))
return 1 + d - iteration;
else
return iteration - d;
default:
g_return_val_if_reached (0);
}
}
static GtkBitmask *
gtk_css_animation_set_values (GtkStyleAnimation *style_animation,
GtkBitmask *changed,
gint64 for_time_us,
GtkCssComputedValues *values)
{
GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
double iteration, progress;
guint i;
iteration = gtk_css_animation_get_iteration (animation, for_time_us);
if (!gtk_css_animation_is_executing_at_iteration (animation, iteration))
return changed;
progress = gtk_css_animation_get_progress_from_iteration (animation, iteration);
progress = _gtk_css_ease_value_transform (animation->ease, progress);
for (i = 0; i < _gtk_css_keyframes_get_n_properties (animation->keyframes); i++)
{
GtkCssValue *value;
guint property_id;
property_id = _gtk_css_keyframes_get_property_id (animation->keyframes, i);
value = _gtk_css_keyframes_get_value (animation->keyframes,
i,
progress,
_gtk_css_computed_values_get_value (values, i));
/* XXX: Is using 0 correct here? */
_gtk_css_computed_values_set_value (values, property_id, value, 0, NULL);
_gtk_css_value_unref (value);
changed = _gtk_bitmask_set (changed, property_id, TRUE);
}
return changed;
}
static gboolean
gtk_css_animation_is_finished (GtkStyleAnimation *style_animation,
gint64 at_time_us)
{
return FALSE;
}
static gboolean
gtk_css_animation_is_static (GtkStyleAnimation *style_animation,
gint64 at_time_us)
{
GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
double iteration;
iteration = gtk_css_animation_get_iteration (animation, at_time_us);
return iteration >= animation->iteration_count;
}
static void
gtk_css_animation_finalize (GObject *object)
{
GtkCssAnimation *animation = GTK_CSS_ANIMATION (object);
g_free (animation->name);
_gtk_css_keyframes_unref (animation->keyframes);
_gtk_css_value_unref (animation->ease);
G_OBJECT_CLASS (_gtk_css_animation_parent_class)->finalize (object);
}
static void
_gtk_css_animation_class_init (GtkCssAnimationClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
object_class->finalize = gtk_css_animation_finalize;
animation_class->set_values = gtk_css_animation_set_values;
animation_class->is_finished = gtk_css_animation_is_finished;
animation_class->is_static = gtk_css_animation_is_static;
}
static void
_gtk_css_animation_init (GtkCssAnimation *animation)
{
}
GtkStyleAnimation *
_gtk_css_animation_new (const char *name,
GtkCssKeyframes *keyframes,
gint64 start_time_us,
gint64 duration_us,
GtkCssValue *ease,
GtkCssDirection direction,
GtkCssPlayState play_state,
GtkCssFillMode fill_mode,
double iteration_count)
{
GtkCssAnimation *animation;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (keyframes != NULL, NULL);
g_return_val_if_fail (ease != NULL, NULL);
g_return_val_if_fail (iteration_count >= 0, NULL);
animation = g_object_new (GTK_TYPE_CSS_ANIMATION, NULL);
animation->name = g_strdup (name);
animation->keyframes = _gtk_css_keyframes_ref (keyframes);
animation->timestamp = start_time_us;
animation->duration = duration_us;
animation->ease = _gtk_css_value_ref (ease);
animation->direction = direction;
animation->play_state = play_state;
animation->fill_mode = fill_mode;
animation->iteration_count = iteration_count;
return GTK_STYLE_ANIMATION (animation);
}
const char *
_gtk_css_animation_get_name (GtkCssAnimation *animation)
{
g_return_val_if_fail (GTK_IS_CSS_ANIMATION (animation), NULL);
return animation->name;
}