--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libmlk-core/core/action.h	Fri Oct 01 20:30:00 2021 +0200
@@ -0,0 +1,81 @@
+/*
+ * action.h -- action states
+ *
+ * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef MOLKO_CORE_ACTION_H
+#define MOLKO_CORE_ACTION_H
+
+#include "core.h"
+
+#define ACTION_STACK_MAX (128)
+
+union event;
+
+struct action {
+	void *data;
+	void (*handle)(struct action *, const union event *);
+	int (*update)(struct action *, unsigned int);
+	void (*draw)(struct action *);
+	void (*end)(struct action *);
+	void (*finish)(struct action *);
+};
+
+struct action_stack {
+	struct action *actions[ACTION_STACK_MAX];
+};
+
+CORE_BEGIN_DECLS
+
+void
+action_handle(struct action *, const union event *);
+
+int
+action_update(struct action *, unsigned int);
+
+void
+action_draw(struct action *);
+
+void
+action_end(struct action *);
+
+void
+action_finish(struct action *);
+
+void
+action_stack_init(struct action_stack *);
+
+int
+action_stack_add(struct action_stack *, struct action *);
+
+void
+action_stack_handle(struct action_stack *, const union event *);
+
+int
+action_stack_update(struct action_stack *, unsigned int);
+
+void
+action_stack_draw(const struct action_stack *);
+
+int
+action_stack_completed(const struct action_stack *);
+
+void
+action_stack_finish(struct action_stack *);
+
+CORE_END_DECLS
+
+#endif /* !MOLKO_CORE_ACTION_H */