Curses: support cycling through long lists of possible auto-completions and optimized screen refreshing/redrawing

 * pressing e.g. TAB when the popup is showing a list of auto-completions
   will show the next page, eventually beginning at the first one again.
 * do not redraw curses windows in the UI methods directly. this resulted
   in flickering during command-line editing macros and ordinary macro calls
   because the physical screen was updated immediately.
   Instead, window refreshing and updated is done centrally in
   event_loop_iter() only after a key has been processed.
   Also we use wnoutrefresh() and doupdate() to send as little to the
   terminal (emulator) as possible.

1 files changed, 15 insertions, 4 deletions

diff --git a/src/interface-curses.h b/src/interface-curses.h
index 35f7edb..70e5300 100644
--- a/src/interface-curses.h
+++ b/src/interface-curses.h
@@ -80,11 +80,16 @@ typedef class InterfaceCurses : public Interface<InterfaceCurses, ViewCurses> {
 
 	struct Popup {
 		WINDOW *window;
-		GSList *list;
-		gint longest;
-		gint length;
+		GSList *list;		/**! list of popup entries */
+		gint longest;		/**! size of longest entry */
+		gint length;		/**! total number of popup entries */
 
-		Popup() : window(NULL), list(NULL), longest(0), length(0) {}
+		GSList *cur_list;	/**! next entry to display */
+		gint cur_entry;	/**! next entry to display (position) */
+
+		Popup() : window(NULL), list(NULL),
+		          longest(3), length(0),
+		          cur_list(NULL), cur_entry(0) {}
 		~Popup();
 	} popup;
 
@@ -122,6 +127,12 @@ public:
 		            const gchar *name, bool highlight = false);
 	/* implementation of Interface::popup_show() */
 	void popup_show_impl(void);
+	/* implementation of Interface::popup_is_shown() */
+	inline bool
+	popup_is_shown_impl(void)
+	{
+		return popup.window != NULL;
+	}
 	/* implementation of Interface::popup_clear() */
 	void popup_clear_impl(void);