qscintilla

QScintilla is a port to Qt of the Scintilla editing component. As well as features found in standard text editing components, Scintilla includes features especially useful when editing and debugging source code:

• syntax styling with support for over 70 languages
• error indicators
• code completion
• call tips
• code folding
• margins can contain markers like those used in debuggers to indicate breakpoints and the current line.
• recordable macros
• multiple views printing.