From fb87c7ac9fb4b9f4a0080e71913047d0268aff65 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Thu, 11 Apr 2013 21:01:00 +0200
Subject: [PATCH] add Window::display_selection_at(LineCount)

---
 src/window.cc | 12 ++++++++++--
 src/window.hh |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/window.cc b/src/window.cc
index 54d7e6a2..132c48fe 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -38,10 +38,18 @@ Window::~Window()
     m_options.unregister_watcher(*this);
 }
 
+void Window::display_selection_at(LineCount line)
+{
+    if (line >= 0 or line < m_dimensions.line)
+    {
+        auto cursor_line = main_selection().last().line();
+        m_position.line = std::max(0_line, cursor_line - line);
+    }
+}
+
 void Window::center_selection()
 {
-    BufferIterator cursor = main_selection().last();
-    m_position.line = std::max(0_line, cursor.line() - m_dimensions.line/2_line);
+    display_selection_at(m_dimensions.line/2_line);
 }
 
 void Window::update_display_buffer()
diff --git a/src/window.hh b/src/window.hh
index 9349c450..b8cf0ddc 100644
--- a/src/window.hh
+++ b/src/window.hh
@@ -33,6 +33,7 @@ public:
     const DisplayBuffer& display_buffer() const { return m_display_buffer; }
 
     void center_selection();
+    void display_selection_at(LineCount line);
     void update_display_buffer();
 
     DisplayCoord display_position(const BufferIterator& it);