Add C++11 Fl_Valuator::format API.

This is helpful for writing language wrapper, in
this particular case for PyFLTK.

1 files changed, 3 insertions, 4 deletions

diff --git a/src/Fl_Value_Input.cxx b/src/Fl_Value_Input.cxx
index 37be93e80..c44386662 100644
--- a/src/Fl_Value_Input.cxx
+++ b/src/Fl_Value_Input.cxx
@@ -1,7 +1,7 @@
 //
 // Value input widget for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2010 by Bill Spitzak and others.
+// Copyright 1998-2026 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -51,9 +51,8 @@ void Fl_Value_Input::resize(int X, int Y, int W, int H) {
 }
 
 void Fl_Value_Input::value_damage() {
-  char buf[128];
-  format(buf);
-  input.value(buf);
+  std::string buf = format_str();
+  input.value(buf.c_str());
   input.mark(input.insert_position()); // turn off selection highlight
 }