--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/action.h	Tue Jan 21 12:28:26 2020 +0100
@@ -0,0 +1,88 @@
+/*
+ * action.h -- action states
+ *
+ * Copyright (c) 2020 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 ACTION_H
+#define ACTION_H
+
+/**
+ * \file action.h
+ * \brief Action states.
+ */
+
+#include <stdbool.h>
+
+union event;
+
+/**
+ * \brief Action flags.
+ */
+enum action_flags {
+	ACTION_NONE,                            /*!< No flags */
+	ACTION_AUTO_LEAVE       = (1 << 0)      /*!< Action is removed on state change */
+};
+
+/**
+ * \brief Action structure.
+ */
+struct action {
+	/**
+	 * (RW)
+	 *
+	 * Optional flags.
+	 */
+	enum action_flags flags;
+
+	/**
+	 * (RW)
+	 *
+	 * Arbitrary user data.
+	 */
+	void *data;
+
+	/**
+	 * (RW)
+	 *
+	 * Handle event.
+	 */
+	void (*handle)(struct action *, const union event *event);
+
+	/**
+	 * (RW)
+	 *
+	 * Update the action.
+	 *
+	 * If returns true, the action is removed.
+	 */
+	bool (*update)(struct action *, unsigned int);
+
+	/**
+	 * (RW)
+	 *
+	 * Draw the aciton.
+	 */
+	void (*draw)(struct action *);
+
+	/**
+	 * (RW)
+	 *
+	 * Close the action before removal.
+	 */
+	void (*finish)(struct action *);
+};
+
+#endif /* !ACTION_H*/