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+/*
+ * gui/input.h - Input operations
+ *
+ * Written 2016 by Werner Almesberger
+ * Copyright 2016 by Werner Almesberger
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef GUI_INPUT_H
+#define GUI_NPUT_H
+
+#include <stdbool.h>
+
+#include <gtk/gtk.h>
+
+
+/*
+ * All members of input_ops are optional, i.e., can be NULL.
+ *
+ * hover_begin and drag_begin must not call input_push or input_pop.
+ */
+
+struct input_ops {
+ bool (*click)(void *user, int x, int y);
+
+ bool (*hover_begin)(void *user, int x, int y);
+ bool (*hover_update)(void *user, int x, int y);
+ bool (*hover_click)(void *user, int x, int y);
+ void (*hover_end)(void *user);
+
+ bool (*drag_begin)(void *user, int x, int y);
+ void (*drag_move)(void *user, int dx, int dy);
+ void (*drag_end)(void *user);
+
+ void (*scroll)(void *user, int x, int y, int dy);
+ /* down = 1, up = -1 */
+
+ void (*key)(void *user, int x, int y, int keyval);
+};
+
+
+bool input_accept(void *user, int x, int y);
+
+void input_push(const struct input_ops *ops, void *user);
+void input_pop(void);
+void input_setup(GtkWidget *da);
+
+#endif /* !GUI_INPUT_H */