1 files changed, 85 insertions, 0 deletions
diff --git a/src/animation/gtd-transition.h b/src/animation/gtd-transition.h
new file mode 100644
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+++ b/src/animation/gtd-transition.h
@@ -0,0 +1,85 @@
+/* gtd-transition.h
+ *
+ * Copyright 2020 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "gtd-timeline.h"
+
+G_BEGIN_DECLS
+
+#define GTD_TYPE_TRANSITION (gtd_transition_get_type())
+G_DECLARE_DERIVABLE_TYPE (GtdTransition, gtd_transition, GTD, TRANSITION, GtdTimeline)
+
+/**
+ * GtdTransitionClass:
+ * @attached: virtual function; called when a transition is attached to
+ *   a #GtdAnimatable instance
+ * @detached: virtual function; called when a transition is detached from
+ *   a #GtdAnimatable instance
+ * @compute_value: virtual function; called each frame to compute and apply
+ *   the interpolation of the interval
+ *
+ * The #GtdTransitionClass structure contains
+ * private data.
+ *
+ * Since: 1.10
+ */
+struct _GtdTransitionClass
+{
+  /*< private >*/
+  GtdTimelineClass parent_class;
+
+  /*< public >*/
+  void (* attached) (GtdTransition *transition,
+                     GtdAnimatable *animatable);
+  void (* detached) (GtdTransition *transition,
+                     GtdAnimatable *animatable);
+
+  void (* compute_value) (GtdTransition *transition,
+                          GtdAnimatable *animatable,
+                          GtdInterval   *interval,
+                          gdouble        progress);
+
+  /*< private >*/
+  gpointer _padding[8];
+};
+
+void                    gtd_transition_set_interval                 (GtdTransition *transition,
+                                                                     GtdInterval   *interval);
+GtdInterval *           gtd_transition_get_interval                 (GtdTransition *transition);
+void                    gtd_transition_set_from_value               (GtdTransition *transition,
+                                                                     const GValue  *value);
+void                    gtd_transition_set_to_value                 (GtdTransition *transition,
+                                                                     const GValue  *value);
+void                    gtd_transition_set_from                     (GtdTransition *transition,
+                                                                     GType          value_type,
+                                                                     ...);
+void                    gtd_transition_set_to                       (GtdTransition *transition,
+                                                                     GType          value_type,
+                                                                     ...);
+
+void                    gtd_transition_set_animatable               (GtdTransition *transition,
+                                                                     GtdAnimatable *animatable);
+GtdAnimatable *         gtd_transition_get_animatable               (GtdTransition *transition);
+void                    gtd_transition_set_remove_on_complete       (GtdTransition *transition,
+                                                                     gboolean       remove_complete);
+gboolean                gtd_transition_get_remove_on_complete       (GtdTransition *transition);
+
+G_END_DECLS