How to custom controls about godiagram

[jonchardy]

This seems like something that should be implemented outside of GoDiagram. You can have a containing panel that holds both a DiagramControl and whatever custom controls you want, and position your controls relative to the diagram if needed.

GoDiagram doesn't support custom controls as nodes since it uses a SkiaSharp canvas to render and is a "black box" for performance reasons.

Certain controls like tooltips, context menus, and text editors can be shown/hidden via the IShowHidable interface.

[mansai]

Avalonia.Controls also uses SkiaSharp

[jonchardy]

Yes, Avalonia and WinForms are both using SkiaSharp for rendering. In both cases, we are using a canvas, which cannot draw arbitrary controls to its surface.