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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"
G_DEFINE_TYPE (GtkCssTransition, _gtk_css_transition, GTK_TYPE_STYLE_ANIMATION)
static void
gtk_css_transition_set_values (GtkStyleAnimation *animation,
gint64 for_time_us,
GtkCssComputedValues *values)
{
GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
GtkCssValue *value, *end;
double progress;
end = _gtk_css_computed_values_get_intrinsic_value (values, transition->property);
if (transition->start_time >= for_time_us)
value = _gtk_css_value_ref (transition->start);
else if (transition->end_time > for_time_us)
{
progress = (double) (for_time_us - transition->start_time) / (transition->end_time - transition->start_time);
progress = _gtk_css_ease_value_transform (transition->ease, progress);
value = _gtk_css_value_transition (transition->start,
end,
transition->property,
progress);
if (value == NULL)
value = _gtk_css_value_ref (end);
}
else
value = NULL;
if (value)
{
_gtk_css_computed_values_set_animated_value (values, transition->property, value);
_gtk_css_value_unref (value);
}
}
static gboolean
gtk_css_transition_is_finished (GtkStyleAnimation *animation,
gint64 at_time_us)
{
GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
return at_time_us >= transition->end_time;
}
static gboolean
gtk_css_transition_is_static (GtkStyleAnimation *animation,
gint64 at_time_us)
{
GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
return at_time_us >= transition->end_time;
}
static void
gtk_css_transition_finalize (GObject *object)
{
GtkCssTransition *transition = GTK_CSS_TRANSITION (object);
_gtk_css_value_unref (transition->start);
_gtk_css_value_unref (transition->ease);
G_OBJECT_CLASS (_gtk_css_transition_parent_class)->finalize (object);
}
static void
_gtk_css_transition_class_init (GtkCssTransitionClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
object_class->finalize = gtk_css_transition_finalize;
animation_class->set_values = gtk_css_transition_set_values;
animation_class->is_finished = gtk_css_transition_is_finished;
animation_class->is_static = gtk_css_transition_is_static;
}
static void
_gtk_css_transition_init (GtkCssTransition *transition)
{
}
GtkStyleAnimation *
_gtk_css_transition_new (guint property,
GtkCssValue *start,
GtkCssValue *ease,
gint64 start_time_us,
gint64 end_time_us)
{
GtkCssTransition *transition;
g_return_val_if_fail (start != NULL, NULL);
g_return_val_if_fail (ease != NULL, NULL);
g_return_val_if_fail (start_time_us <= end_time_us, NULL);
transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
transition->property = property;
transition->start = _gtk_css_value_ref (start);
transition->ease = _gtk_css_value_ref (ease);
transition->start_time = start_time_us;
transition->end_time = end_time_us;
return GTK_STYLE_ANIMATION (transition);
}
guint
_gtk_css_transition_get_property (GtkCssTransition *transition)
{
g_return_val_if_fail (GTK_IS_CSS_TRANSITION (transition), 0);
return transition->property;
}
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