From 7c22ff217d5d02bb926202e48dc35ba7a19c6f66 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Sun, 21 Jun 2015 19:47:47 +0100
Subject: [PATCH] Improve ncurses redraw behaviour

---
 src/ncurses_ui.cc | 15 +++++++++++----
 src/ncurses_ui.hh |  2 ++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/ncurses_ui.cc b/src/ncurses_ui.cc
index 7f7dbcba..aee5b89c 100644
--- a/src/ncurses_ui.cc
+++ b/src/ncurses_ui.cc
@@ -284,7 +284,6 @@ NCursesUI::~NCursesUI()
 
 void NCursesUI::redraw()
 {
-    redrawwin(m_window);
     wnoutrefresh(m_window);
     if (m_menu_win)
     {
@@ -616,9 +615,7 @@ void NCursesUI::menu_show(ConstArrayView<String> items,
                           CharCoord anchor, Face fg, Face bg,
                           MenuStyle style)
 {
-    if (m_menu_win)
-        delwin(m_menu_win);
-    m_items.clear();
+    menu_hide();
 
     m_menu_fg = fg;
     m_menu_bg = bg;
@@ -688,6 +685,7 @@ void NCursesUI::menu_hide()
     if (not m_menu_win)
         return;
     m_items.clear();
+    mark_dirty(m_menu_win);
     delwin(m_menu_win);
     m_menu_win = nullptr;
     m_dirty = true;
@@ -871,11 +869,20 @@ void NCursesUI::info_hide()
 {
     if (not m_info_win)
         return;
+    mark_dirty(m_info_win);
     delwin(m_info_win);
     m_info_win = nullptr;
     m_dirty = true;
 }
 
+void NCursesUI::mark_dirty(NCursesWin* region)
+{
+    auto pos = window_pos(region);
+    auto size = window_size(region);
+
+    wredrawln(m_window, (int)pos.line, (int)size.line);
+}
+
 CharCoord NCursesUI::dimensions()
 {
     return m_dimensions;
diff --git a/src/ncurses_ui.hh b/src/ncurses_ui.hh
index a98550c6..ac73332d 100644
--- a/src/ncurses_ui.hh
+++ b/src/ncurses_ui.hh
@@ -57,6 +57,8 @@ private:
     void draw_line(const DisplayLine& line, CharCount col_index,
                    const Face& default_face) const;
 
+    void mark_dirty(NCursesWin* region);
+
     NCursesWin* m_window = nullptr;
 
     CharCoord m_dimensions;