forked from AuroraMiddleware/gtk
55ade04e11
Otherwise, that value will never get reset and remain frozen in time. This is problematic for example when the value is inherited and the parent changes the value.
141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/*
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* Copyright © 2012 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkcsstransitionprivate.h"
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#include "gtkcsseasevalueprivate.h"
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G_DEFINE_TYPE (GtkCssTransition, _gtk_css_transition, GTK_TYPE_STYLE_ANIMATION)
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static void
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gtk_css_transition_set_values (GtkStyleAnimation *animation,
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gint64 for_time_us,
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GtkCssComputedValues *values)
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{
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GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
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GtkCssValue *value, *end;
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double progress;
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end = _gtk_css_computed_values_get_intrinsic_value (values, transition->property);
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if (transition->start_time >= for_time_us)
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value = _gtk_css_value_ref (transition->start);
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else if (transition->end_time > for_time_us)
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{
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progress = (double) (for_time_us - transition->start_time) / (transition->end_time - transition->start_time);
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progress = _gtk_css_ease_value_transform (transition->ease, progress);
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value = _gtk_css_value_transition (transition->start,
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end,
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transition->property,
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progress);
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if (value == NULL)
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value = _gtk_css_value_ref (end);
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}
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else
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value = NULL;
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if (value)
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{
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_gtk_css_computed_values_set_animated_value (values, transition->property, value);
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_gtk_css_value_unref (value);
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}
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}
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static gboolean
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gtk_css_transition_is_finished (GtkStyleAnimation *animation,
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gint64 at_time_us)
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{
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GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
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return at_time_us >= transition->end_time;
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}
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static gboolean
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gtk_css_transition_is_static (GtkStyleAnimation *animation,
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gint64 at_time_us)
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{
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GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
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return at_time_us >= transition->end_time;
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}
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static void
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gtk_css_transition_finalize (GObject *object)
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{
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GtkCssTransition *transition = GTK_CSS_TRANSITION (object);
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_gtk_css_value_unref (transition->start);
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_gtk_css_value_unref (transition->ease);
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G_OBJECT_CLASS (_gtk_css_transition_parent_class)->finalize (object);
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}
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static void
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_gtk_css_transition_class_init (GtkCssTransitionClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
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object_class->finalize = gtk_css_transition_finalize;
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animation_class->set_values = gtk_css_transition_set_values;
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animation_class->is_finished = gtk_css_transition_is_finished;
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animation_class->is_static = gtk_css_transition_is_static;
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}
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static void
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_gtk_css_transition_init (GtkCssTransition *transition)
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{
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}
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GtkStyleAnimation *
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_gtk_css_transition_new (guint property,
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GtkCssValue *start,
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GtkCssValue *ease,
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gint64 start_time_us,
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gint64 end_time_us)
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{
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GtkCssTransition *transition;
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g_return_val_if_fail (start != NULL, NULL);
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g_return_val_if_fail (ease != NULL, NULL);
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g_return_val_if_fail (start_time_us <= end_time_us, NULL);
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transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
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transition->property = property;
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transition->start = _gtk_css_value_ref (start);
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transition->ease = _gtk_css_value_ref (ease);
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transition->start_time = start_time_us;
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transition->end_time = end_time_us;
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return GTK_STYLE_ANIMATION (transition);
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}
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guint
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_gtk_css_transition_get_property (GtkCssTransition *transition)
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{
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g_return_val_if_fail (GTK_IS_CSS_TRANSITION (transition), 0);
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return transition->property;
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}
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