diff -r fe94e0fb9ef3 -r 2dbc56c2323b ui/cocoa/text.h
--- a/ui/cocoa/text.h	Sat Mar 29 12:15:39 2014 +0100
+++ b/ui/cocoa/text.h	Sat Mar 29 19:12:07 2014 +0100
@@ -28,6 +28,31 @@
 
 #import "../ui/text.h"
 #import "toolkit.h"
+#import "../../ucx/list.h"
+
+@interface TextChangeMgr : NSObject<NSTextViewDelegate> {
+    UiText* value;
+}
+
+- (TextChangeMgr*)initWithValue:(UiText*)text;
+
+- (NSUndoManager*)undoManagerForTextView:(NSTextView*)textview;
+
+@end
+
+#define UI_TEXTBUF_INSERT 0
+#define UI_TEXTBUF_DELETE 1
+typedef struct UiTextBufOp {
+    int  type; // UI_TEXTBUF_INSERT, UI_TEXTBUF_DELETE
+    int  start;
+    int  end;
+    int  len;
+    char *text;
+} UiTextBufOp;
+
+
 
 char* ui_textarea_get(UiText *text);
 void ui_textarea_set(UiText *text, char *str);
+char* ui_textarea_getsubstr(UiText *text, int begin, int end);
+void ui_textarea_insert(UiText *text, int pos, char *str);