From e1fef748e8fdd3410b875d391cb0223440ce8a9d Mon Sep 17 00:00:00 2001
From: Fabian Jakobs <fabian.jakobs@web.de>
Date: Sun, 13 Feb 2011 16:06:21 +0100
Subject: [PATCH] implement center selection in view port command

---
 lib/ace/commands/default_commands.js | 4 ++++
 lib/ace/editor.js                    | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/lib/ace/commands/default_commands.js b/lib/ace/commands/default_commands.js
index 3565cc5b..0c555076 100644
--- a/lib/ace/commands/default_commands.js
+++ b/lib/ace/commands/default_commands.js
@@ -261,6 +261,9 @@ canon.addCommand({
     }
 });
 canon.addCommand({
+    name: "centerselection",
+    exec: function(env, args, request) { env.editor.centerSelection(); }
+});
 canon.addCommand({
     name: "splitline",
     exec: function(env, args, request) { env.editor.splitLine(); }
@@ -270,4 +273,5 @@ canon.addCommand({
     exec: function(env, args, request) { env.editor.transposeLetters(); }
 });
 
+
 });
diff --git a/lib/ace/editor.js b/lib/ace/editor.js
index 6a8d38f9..67ff0735 100644
--- a/lib/ace/editor.js
+++ b/lib/ace/editor.js
@@ -824,6 +824,12 @@ var Editor =function(renderer, session) {
     this.scrollToLine = function(line, center) {
         this.renderer.scrollToLine(line, center);
     };
+    
+    this.centerSelection = function() {
+        var range = this.getSelectionRange();
+        var line = Math.floor(range.start.row + (range.end.row - range.start.row) / 2);
+        this.renderer.scrollToLine(line, true);
+    };
 
     this.getCursorPosition = function() {
         return this.selection.getCursor();