fltk::Input
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+----fltk::Output
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+----fltk::MultilineOutput
#include <fltk/Output.h>

There is a single subclass, fltk::MultilineOutput, which allows you to display multiple lines of text.
The text may contain any characters except \0, and will correctly display anything, using ^X notation for unprintable control characters and \nnn notation for unprintable characters with the high bit set. It assummes the font can draw any characters in the ISO-Latin1 character set.
The second two forms change the text and set the mark and the point to the end of it. The string is copied to the internal buffer. Passing NULL is the same as "". This returns non-zero if the new value is different than the current one. You can use the second version to directly set the length if you know it already or want to put nul's in the text.