[ROOT] How does one write a generalized listbox?

From: James Peachey (peachey@bigband.gsfc.nasa.gov)
Date: Thu Aug 16 2001 - 17:36:01 MEST 

Hello,

I'm working on a Root GUI in which I would like to display
composite objects (i.e. derived from TGCompositeFrame) in
a listbox-style display. I started by looking at the TGListBox
family of routines.  However, there are two design issues which
I'm not sure how to address:

  1) I might also like a horizontal scrollbar, but TGListBox
     has just a vertical. Would I be better off working with a
     TGCanvas and adding listbox functionality, or would it be
     easier to derive from TGListBox and add a scrollbar?

  2) If I do derive from TGListBox it's not obvious how to
     generalize the approach taken by TGTextLBEntry for
     displaying text, because its base class, TGLBEntry, derives
     from TGFrame, and not TGCompositeFrame. How can I derive
     something from TGLBEntry which contains multiple frames?

I'd be grateful for any advice you can give about how to
approach this.

Thanks,
James

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