--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libmlk-ui/ui/checkbox.h	Sat Nov 28 22:37:30 2020 +0100
@@ -0,0 +1,100 @@
+/*
+ * checkbox.h -- GUI checkbox
+ *
+ * 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 MOLKO_UI_CHECKBOX_H
+#define MOLKO_UI_CHECKBOX_H
+
+/**
+ * \file checkbox.h
+ * \brief GUI checkbox.
+ * \ingroup ui
+ */
+
+#include <stdbool.h>
+
+union event;
+
+struct action;
+struct theme;
+
+/**
+ * \brief GUI checkbox.
+ */
+struct checkbox {
+	int x;                          /*!< (+) Position in x. */
+	int y;                          /*!< (+) Position in y. */
+	unsigned int w;                 /*!< (+) Width. */
+	unsigned int h;                 /*!< (+) Height. */
+	bool checked;                   /*!< (+) Is activated? */
+	const struct theme *theme;      /*!< (+&?) Theme to use. */
+};
+
+/**
+ * Default drawing function.
+ *
+ * \pre t != NULL
+ * \pre cb != NULL
+ * \param t the theme
+ * \param cb the checkbox
+ */
+void
+checkbox_draw_default(const struct theme *t, const struct checkbox *cb);
+
+/**
+ * Draw the checkbox.
+ *
+ * \pre cb != NULL
+ * \pre ev != NULL
+ * \param cb the checkbox
+ * \param ev the event
+ */
+void
+checkbox_handle(struct checkbox *cb, const union event *ev);
+
+/**
+ * Draw the checkbox.
+ *
+ * \pre cb != NULL
+ * \param cb the checkbox
+ */
+void
+checkbox_draw(const struct checkbox *cb);
+
+/**
+ * Convert the checkbox into an action.
+ *
+ * The following field will be set into the action:
+ *
+ * - act->data: points to cb (reference),
+ * - act->handle: a wrapper to checkbox_handle,
+ * - act->draw: a wrapper to checkbox_draw.
+ *
+ * The checkbox being an UI element is considered to never completes, as such
+ * you will need to handle this case or to use a custom update function.
+ *
+ * \note You will still need to check the checkbox state and reset it at some
+ *       point.
+ * \pre cb != NULL
+ * \pre act != NULL
+ * \param cb the checkbox to reference
+ * \param act the action to fill
+ */
+void
+checkbox_action(struct checkbox *cb, struct action *act);
+
+#endif /* !MOLKO_UI_CHECKBOX_H */