Parnassus Core Editor 1.6.3 for Alexandria from May 25, 2022

The first part of this series examined an area not exposed by the Open Tools API (Delphi’s plugin API): integrating with the code editor. Yet several plugins, such as CnPack, Castalia, and two of my own soon-to-be-released plugins (Bookmarks and a Mystery Plugin), integrate into the code editor painting along with the code. How do they do it? The answer is by hooking a number of IDE methods at runtime, and the first article showed how to do this with one method, TCustomEditControl.PaintLine, and ended painting some text on the top left of the editor.

https://developer.team/delphi/32283-parnassus-core-editor-163-for-alexandria-from-may-25-2022.html