Import Upstream version 43.0upstream/latest

1 files changed, 85 insertions, 0 deletions

diff --git a/src/animation/gtd-animatable.h b/src/animation/gtd-animatable.h
new file mode 100644
index 0000000..3edb07d
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+++ b/src/animation/gtd-animatable.h
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+/* gtd-animatable.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-types.h"
+
+G_BEGIN_DECLS
+
+#define GTD_TYPE_ANIMATABLE (gtd_animatable_get_type ())
+G_DECLARE_INTERFACE (GtdAnimatable, gtd_animatable, GTD, ANIMATABLE, GObject)
+
+/**
+ * GtdAnimatableInterface:
+ * @find_property: virtual function for retrieving the #GParamSpec of
+ *   an animatable property
+ * @get_initial_state: virtual function for retrieving the initial
+ *   state of an animatable property
+ * @set_final_state: virtual function for setting the state of an
+ *   animatable property
+ * @interpolate_value: virtual function for interpolating the progress
+ *   of a property
+ * @get_widget: virtual function for getting associated #GtdWidget
+ *
+ * Since: 1.0
+ */
+struct _GtdAnimatableInterface
+{
+  /*< private >*/
+  GTypeInterface parent_iface;
+
+  /*< public >*/
+  GParamSpec *(* find_property)     (GtdAnimatable *animatable,
+                                     const gchar       *property_name);
+  void        (* get_initial_state) (GtdAnimatable *animatable,
+                                     const gchar       *property_name,
+                                     GValue            *value);
+  void        (* set_final_state)   (GtdAnimatable *animatable,
+                                     const gchar       *property_name,
+                                     const GValue      *value);
+  gboolean    (* interpolate_value) (GtdAnimatable *animatable,
+                                     const gchar       *property_name,
+                                     GtdInterval   *interval,
+                                     gdouble            progress,
+                                     GValue            *value);
+  GtdWidget * (* get_widget)      (GtdAnimatable *animatable);
+};
+
+GParamSpec *gtd_animatable_find_property     (GtdAnimatable *animatable,
+                                              const gchar   *property_name);
+
+void        gtd_animatable_get_initial_state (GtdAnimatable *animatable,
+                                              const gchar   *property_name,
+                                              GValue        *value);
+
+void        gtd_animatable_set_final_state   (GtdAnimatable *animatable,
+                                              const gchar   *property_name,
+                                              const GValue  *value);
+
+gboolean    gtd_animatable_interpolate_value (GtdAnimatable *animatable,
+                                              const gchar   *property_name,
+                                              GtdInterval   *interval,
+                                              gdouble        progress,
+                                              GValue        *value);
+
+GtdWidget * gtd_animatable_get_widget      (GtdAnimatable *animatable);
+
+G_END_DECLS