I would use wxWidgets. Mostly because it comes with an easy to use cross platform scintilla like API and an example using it. So I would use wxSTC with wxAUI with dynamic notebooks.
wxSTC handles a lot of the things you would need in a code editor have a look at:
http://wiki.wxwidgets.org/WxStyledTextCtrl
http://docs.wxwidgets.org/trunk/classwx_styled_text_ctrl.html
for features and the API.
How would somebody go about making a dynamic autocomplete functionality in a custom IDE using Scintilla? I can't find anything about this.
I've written script editors in Qt in the past and its pretty good. There is a wealth of example code, including a sample in the official Qt documentation, for things like syntax highlighting, showing line numbers, having a clickable gutter and so on.
Qt even has a QCompleter class which works within Qt's model-view architecture so very clean to use.
Scintilla is also excellent of course.
DoctorGlow thanks for the documentation, I was hoping I could find a live example of source code for an IDE that implements a dynamic auto-complete system preferably written in Scintilla, however I have had no luck on the search engines.
There are two projects that use wxWidgets \ scintilla for a code editor or IDE and they both have some form of auto-complete and snippets, they are also open source. They also show off plugin architecture and pretty much everything to do with getting your own IDE up.
