From 0fb4feb11a8fc3cf843aeb5f6ba02cf8c0538dce Mon Sep 17 00:00:00 2001
From: Matthias Melcher <fltk@matthiasm.com>
Date: Sat, 6 Nov 2010 00:29:58 +0000
Subject: Working on correct line wrapping in Fl_Text_Display: starting to
 replace all byte based charracter calculations with utf8 functions. Current
 version wraps, but scroll bars are wrong. Non-wrapping text display starts to
 work better.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7797 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Text_Buffer.cxx | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

(limited to 'src/Fl_Text_Buffer.cxx')

diff --git a/src/Fl_Text_Buffer.cxx b/src/Fl_Text_Buffer.cxx
index 622ccd1ee..565e6183b 100644
--- a/src/Fl_Text_Buffer.cxx
+++ b/src/Fl_Text_Buffer.cxx
@@ -1585,7 +1585,7 @@ int Fl_Text_Buffer::outputfile(const char *file, int start, int end,
  Return the previous character position.
  Uncode safe.
  */
-int Fl_Text_Buffer::prev_char(int pos) const
+int Fl_Text_Buffer::prev_char_clipped(int pos) const
 {
   if (pos<=0)
     return 0;
@@ -1601,9 +1601,21 @@ int Fl_Text_Buffer::prev_char(int pos) const
   return pos;
 }
 
+
+/*
+ Return the previous character poosition.
+ Returns -1 if the beginning of the buffer is reached.
+ */
+int Fl_Text_Buffer::prev_char(int pos) const
+{
+  if (pos==0) return -1;
+  return prev_char_clipped(pos);
+}
+
+
 /*
  Return the next character position.
- Uncode safe.
+ Returns length() if the end of the buffer is reached.
  */
 int Fl_Text_Buffer::next_char(int pos) const
 {
@@ -1614,6 +1626,19 @@ int Fl_Text_Buffer::next_char(int pos) const
   return pos;
 }
 
+
+/*
+ Return the next character poosition.
+ If the end of the buffer is reached, it returns the current position.
+ */
+int Fl_Text_Buffer::next_char_clipped(int pos) const
+{
+  int n = next_char(pos);
+  if (pos==mLength) return pos;
+  return n;
+}
+
+
 //
 // End of "$Id$".
 //
-- 
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