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I would like to understand how to build an attached menubar. For example, Image has the following bar - an attached cell that arises when clicked on:

NotebookOpen@
 FileNameJoin[{$InstallationDirectory, 
   "SystemFiles/FrontEnd/SystemResources/AttachedImage2D.nb"}]

enter image description here

Here's a minimal example that will show the bar:

RawBoxes @ GraphicsBox[
      TagBox[
         RasterBox@{{{0, 0, 255}}},
         BoxForm`ImageTag["Byte"]
      ], ImageSizeRaw -> {2, 2}]

So far as I can tell, the TagBox and ImageSizeRaw options are both necessary - removing either causes the AttachedImage2D to go away.

Such a tutorial would be need to explain three things:

  1. How to build the GUI cell (something that looks like AttachedImage2D)?
  2. How to access/alter the data of the boxed object to which it is attached?
  3. How to associate the bar to a specific type of box and trigger it on clicks?

If a developer could help explain this, there are tons of fun applications here, e.g. making an AttachedGraph2D/3D cells, etc.

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  • $\begingroup$ Search around for AttachedCell AttachCell. $\endgroup$ – Kuba♦ Sep 6 '18 at 19:49