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/*
* 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 "gtkcsstransitionprivate.h"
#include "gtkcsseasevalueprivate.h"
#include "gtkprogresstrackerprivate.h"
struct _GtkCssTransition
{
GtkStyleAnimation parent;
guint property;
guint finished;
GtkCssValue *start;
GtkCssValue *ease;
GtkProgressTracker tracker;
};
static GtkStyleAnimation * gtk_css_transition_advance (GtkStyleAnimation *style_animation,
gint64 timestamp);
static void
gtk_css_transition_apply_values (GtkStyleAnimation *style_animation,
GtkCssAnimatedStyle *style)
{
GtkCssTransition *transition = (GtkCssTransition *)style_animation;
GtkCssValue *value, *end;
double progress;
GtkProgressState state;
if (transition->finished)
return;
end = gtk_css_animated_style_get_intrinsic_value (style, transition->property);
state = gtk_progress_tracker_get_state (&transition->tracker);
if (state == GTK_PROGRESS_STATE_BEFORE)
value = _gtk_css_value_ref (transition->start);
else if (state == GTK_PROGRESS_STATE_DURING)
{
progress = gtk_progress_tracker_get_progress (&transition->tracker, FALSE);
progress = _gtk_css_ease_value_transform (transition->ease, progress);
value = _gtk_css_value_transition (transition->start,
end,
transition->property,
progress);
}
else
return;
if (value == NULL)
value = _gtk_css_value_ref (end);
gtk_css_animated_style_set_animated_value (style, transition->property, value);
}
static gboolean
gtk_css_transition_is_finished (GtkStyleAnimation *animation)
{
GtkCssTransition *transition = (GtkCssTransition *)animation;
return transition->finished;
}
static gboolean
gtk_css_transition_is_static (GtkStyleAnimation *animation)
{
GtkCssTransition *transition = (GtkCssTransition *)animation;
return transition->finished;
}
static void
gtk_css_transition_free (GtkStyleAnimation *animation)
{
GtkCssTransition *self = (GtkCssTransition *)animation;
gtk_css_value_unref (self->start);
gtk_css_value_unref (self->ease);
g_free (self);
}
static const GtkStyleAnimationClass GTK_CSS_TRANSITION_CLASS = {
"GtkCssTransition",
gtk_css_transition_free,
gtk_css_transition_is_finished,
gtk_css_transition_is_static,
gtk_css_transition_apply_values,
gtk_css_transition_advance,
};
static GtkStyleAnimation *
gtk_css_transition_advance (GtkStyleAnimation *style_animation,
gint64 timestamp)
{
GtkCssTransition *source = (GtkCssTransition *)style_animation;
GtkCssTransition *transition;
transition = g_new (GtkCssTransition, 1);
transition->parent.class = >K_CSS_TRANSITION_CLASS;
transition->parent.ref_count = 1;
transition->property = source->property;
transition->start = _gtk_css_value_ref (source->start);
transition->ease = _gtk_css_value_ref (source->ease);
gtk_progress_tracker_init_copy (&source->tracker, &transition->tracker);
gtk_progress_tracker_advance_frame (&transition->tracker, timestamp);
transition->finished = gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
return (GtkStyleAnimation *)transition;
}
GtkStyleAnimation *
_gtk_css_transition_new (guint property,
GtkCssValue *start,
GtkCssValue *ease,
gint64 timestamp,
gint64 duration_us,
gint64 delay_us)
{
GtkCssTransition *transition;
g_return_val_if_fail (start != NULL, NULL);
g_return_val_if_fail (ease != NULL, NULL);
transition = g_new (GtkCssTransition, 1);
transition->parent.class = >K_CSS_TRANSITION_CLASS;
transition->parent.ref_count = 1;
transition->property = property;
transition->start = _gtk_css_value_ref (start);
transition->ease = _gtk_css_value_ref (ease);
gtk_progress_tracker_start (&transition->tracker, duration_us, delay_us, 1.0);
gtk_progress_tracker_advance_frame (&transition->tracker, timestamp);
transition->finished = gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
return (GtkStyleAnimation*)transition;
}
guint
_gtk_css_transition_get_property (GtkCssTransition *transition)
{
return transition->property;
}
gboolean
_gtk_css_transition_is_transition (GtkStyleAnimation *animation)
{
return animation->class == >K_CSS_TRANSITION_CLASS;
}
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